CN201998976U - Electronic parking brake system - Google Patents

Abstract

The utility model provides an electronic parking brake system, which includes a switch module, a first control module, a second control module electrically connected to the first control module, a monitoring module, a drive module and a power supply module, and the power supply module supplies the switch module, the first control module, the second control module, the monitoring module and the driving module provide electric energy; the first control module outputs the first control signal according to the operation of the switch module by the user, and outputs a status signal; the monitoring module outputs the first control signal according to the operation of the first control module When the first control module fails, it outputs a fault signal; when the second control module receives the fault signal from the monitoring module, it controls the first control module to stop working, and then outputs the second control signal according to the user's operation on the switch module ; The drive module drives the motor to work according to the first control signal or the second control signal. The electronic parking brake system can improve the safety and reliability of the vehicle.

Description

An electronic parking brake system

technical field

The utility model relates to a vehicle brake system, in particular to an electronic parking brake system.

Background technique

With the continuous advancement of vehicle technology, more and more cars have changed from traditional mechanical control to electronic control. The electronic parking brake system uses electric energy to realize the function of parking brake, which can adapt to frequent start and stop on flat roads. Operation, through the thermal compensation of the brake pads and automatic detection of brake pad wear, the functions of anti-backward slipping, anti-slipping forward, emergency parking, manual parking and other functions on the slope are realized, making the driver's operation simple and fast.

The electronic parking brake system mainly controls the forward rotation and reverse rotation of the motor through the control module according to the user's operation on the switch module to realize parking and unparking. However, when the control unit fails to work, it cannot control the motor. Parking and unparking are realized through the forward and reverse rotation of the vehicle, and there are potential safety hazards, which will reduce the safety and reliability of the vehicle.

Contents of the invention

The utility model provides an electronic parking brake system. When the main control module fails to work, the redundant control module can control the forward rotation and reverse rotation of the motor to realize parking and unparking, and improve the safety and reliability of the vehicle. sex.

The utility model provides an electronic parking brake system, which comprises a switch module, a first control module, a second control module electrically connected with the first control module, and a monitoring device electrically connected with the first control module and the second control module respectively. modules, a drive module and a power module electrically connected to the first control module and the second control module respectively, and the power module is electrically connected to the switch module, the first control module, the second control module, the monitoring module and the drive module;

A power module, used to provide electrical energy to the switch module, the first control module, the second control module, the monitoring module and the driving module;

The first control module is configured to output a first control signal and a status signal according to the user's operation on the switch module;

A monitoring module, configured to judge according to the state signal of the first control module, and output a fault signal when the first control module fails;

The second control module is used to control the first control module to stop working when receiving the fault signal from the monitoring module, and then output the second control signal according to the operation of the switch module by the user;

The drive module is used to drive the motor to work according to the first control signal or the second control signal.

Further, the power supply module includes a power control unit and a first power supply unit and a second power supply unit for providing electric energy, the first power supply unit and the second power supply unit are respectively electrically connected to the input terminals of the power control unit, The output terminals of the power control unit are respectively electrically connected to the switch module, the first control module, the second control module, the monitoring module and the driving module;

The power control unit is used to control the power supply unit to stop working when the output voltage of the first power supply unit or the second power supply unit is lower than the first set voltage value.

Further, the electronic parking brake system also includes a first isolation module and a second isolation module for signal isolation, the input end of the first isolation module is electrically connected to the output end of the first control module, and the second isolation module The input end of the second control module is electrically connected to the signal output end of the second control module, the output ends of the first isolation module and the second isolation module are respectively electrically connected to the input end of the drive module, and the first isolation module and the second isolation module The control terminals of the second control module are respectively electrically connected to the enabling output terminals;

The power supply module is also used to provide electric energy to the first isolation module and the second isolation module.

Further, the drive module includes a first drive unit for driving the first motor and a second drive unit for driving the second motor, the first isolation module includes a first isolation unit and a second isolation unit, the The second isolation module includes a third isolation unit and a fourth isolation unit, the output terminals of the first isolation unit and the third isolation unit are electrically connected to the first drive unit, and the output terminals of the second isolation unit and the fourth isolation unit The terminal is electrically connected to the second drive unit;

The second control module is also used to control the first isolation unit or the third isolation unit to stop working and control the second isolation unit or the fourth isolation unit when the sampling voltage received by the first drive unit is lower than the second set voltage value. The isolation unit starts working.

Further, the first driving unit and the second driving unit are respectively a relay driving circuit and/or an H-bridge driving circuit.

Further, the driving module is a relay driving circuit or an H-bridge driving circuit.

Further, the relay drive circuit includes a voltage amplifier, a first relay, a second relay and four relay isolation circuits, the input terminals of the voltage amplifier are respectively electrically connected to the output terminals of the first isolation unit and the third isolation unit, so The output terminals of the voltage amplifier are respectively electrically connected to the input terminals of the first relay and the second relay, wherein each relay isolation circuit includes a first voltage dividing resistor, a second voltage dividing resistor and a P-type switch tube, and the P The control end of the type switch tube is electrically connected to one end of the first voltage dividing resistor and the second voltage dividing resistor respectively, and the other end of the first voltage dividing resistor is electrically connected to the output ends of the first isolation unit and the third isolation unit respectively , the other end of the second voltage dividing resistor is electrically connected to the VCC power supply, wherein the input end of the P-type switching tube in the two relay isolation circuits is electrically connected to the output end of the first relay, and the output of the P-type switching tube end is electrically connected with the first motor, and the input end of the P-type switch tube in the other two relay isolation circuits is electrically connected with the output end of the second relay, and the output end of the P-type switch tube is connected to the second electric motor. electromechanical connection.

Further, the H-bridge drive circuit includes two first drive circuits, two second drive circuits and two third drive circuits;

Each first drive circuit includes a third voltage dividing resistor, a fourth voltage dividing resistor and a P-type switch tube, the control terminals of the P-type switch tube are electrically connected to one end of the third voltage dividing resistor and the fourth voltage dividing resistor respectively , the other end of the third voltage dividing resistor is electrically connected to the output end of the second isolation unit and the fourth isolation unit, and the other end of the fourth voltage dividing resistor and the output end of the P-type switch are respectively connected to VCC power supply electrical connection;

Each second drive circuit includes a fifth voltage dividing resistor and an N-type switch tube, the control terminal of the N-type switch tube is electrically connected to one end of the fifth voltage dividing resistor, and the other end of the fifth voltage dividing resistor is respectively isolated from the second The unit is electrically connected to the output end of the fourth isolation unit, the output end of the N-type switch tube is electrically connected to the input end of the P-type switch tube, and the input end of the N-type switch tube is electrically connected to the ground;

Each third drive circuit includes a seventh voltage dividing resistor, an eighth voltage dividing resistor and a P-type switch tube, the control end of the P-type switch tube is electrically connected to one end of the seventh voltage dividing resistor and the eighth voltage dividing resistor respectively , the other end of the seventh voltage dividing resistor is electrically connected to the output ends of the second isolation unit and the fourth isolation unit, the other end of the eighth voltage dividing resistor is electrically connected to the VCC power supply, and the input of the P-type switch tube The terminal is electrically connected to the output end of the N-type switch tube, and the output end of the P-type switch tube is electrically connected to the motor.

Further, the monitoring module is a watchdog circuit.

Compared with the prior art, the electronic parking brake system provided by the utility model monitors the working state of the first control module through the monitoring module. When the first control module fails, the second control module controls the first control module. Stop working, and replace the first control module to control the drive module to drive the motor to realize parking and unparking, so when the first control module fails to work, the second control module can also control the motor to realize parking and unparking, so it can Improve the safety and stability of the electronic parking brake system and reduce potential safety hazards.

Description of drawings

Fig. 1 is a schematic structural block diagram of an embodiment of the electronic parking brake system of the present invention.

Fig. 2 is a schematic structural block diagram of another embodiment of the electronic parking brake system of the present invention.

Fig. 3 is a circuit diagram of an embodiment of the power control unit of the present invention.

Fig. 4 is a circuit diagram of an embodiment of the first control module, the second control module, the first isolation module and the second isolation module of the present invention.

Fig. 5 is a circuit diagram of an embodiment of the voltage amplifier, the first relay and the second relay of the present invention.

Fig. 6 is a circuit diagram of an embodiment of the relay isolation circuit of the present invention.

FIG. 7 is a circuit diagram of an embodiment of the H-bridge driving circuit of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1, the utility model provides an embodiment of the electronic parking brake system, including a switch module 1, a first control module 2, a second control module 3 electrically connected to the first control module 2, respectively The monitoring module 4 electrically connected to the first control module 2 and the second control module 3, the drive module 5 and the power module 6 electrically connected to the first control module 2 and the second control module 3 respectively, and the power module 6 is connected to the switch respectively. Module 1, first control module 2, second control module 3, monitoring module 4 and drive module 5 are electrically connected, wherein:

A power supply module 6, configured to provide electrical energy to the switch module 1, the first control module 2, the second control module 3, the monitoring module 4 and the driving module 5;

The first control module 2 is configured to output a first control signal and a status signal according to the user's operation on the switch module 1;

The monitoring module 4 is used to judge according to the state signal of the first control module 2, and output a fault signal when the first control module 2 fails;

The second control module 3 is used to control the first control module 2 to stop working when receiving the fault signal from the monitoring module 4, and then output the second control signal according to the user's operation on the switch module 1;

The driving module 5 is used to drive the motor to work according to the first control signal or the second control signal.

In this embodiment, the working state of the first control module 2 is monitored by the monitoring module 4. When the first control module 2 fails, the second control module 3 controls the first control module 2 to stop working, and replaces the first control module 2 at the same time. Module 2 controls the drive module 5 to drive the motor to realize parking and unparking, so when the first control module 2 fails to work, the second control module 3 can also control the motor to realize parking and unparking, so the electronic parking system can be improved. The security and stability of the dynamic system and reduce potential safety hazards.

In a specific implementation, the monitoring module 4 can be a watchdog circuit, and the status signal of the first control module 2 can be obtained by electrically connecting the pin of the watchdog circuit to the status pin of the first control module 2, such as when When the state signal is high level, the first control module 2 is working normally; when the state signal is low level, it indicates that the first control module 2 has a fault and cannot work, and the watchdog circuit outputs a reset signal to the second control module 3, and the second control module 3 The second control module 3 controls the first control module 2 to stop working according to the reset signal, and simultaneously replaces the first control module 2 to control the drive module 5.

The utility model also provides another embodiment of the electronic parking brake system. As shown in FIG. 2 , the power supply module 6 in this implementation includes a power supply control unit 61 and a first power supply unit 62 and a second power supply for providing electric energy. Unit 63, the first power supply unit 62 and the second power supply unit 63 are electrically connected to the input terminals of the power supply control unit 61 respectively, and the output terminals of the power supply control unit 61 are respectively connected to the switch module 1 and the first control module 2 , the second control module 3, the monitoring module 4 and the driving module 5 are electrically connected, wherein:

The power supply control unit 61 is used to control the power supply unit to stop working when the output voltage of the first power supply unit 62 or the second power supply unit 63 is less than the first set voltage value, that is, the first power supply unit 62 is controlled by the power supply control unit 61. Or the output voltage of the second power supply unit 63 is detected, when the output voltage of the first power supply unit 62 is less than the first set voltage value, the power control unit 61 will control the first power supply unit 62 to stop working, and the second power supply unit 63 Provide electric energy; when the output voltage of the second power supply unit 63 was less than the first set voltage value, the power control unit 61 just controlled the second power supply unit 63 to stop working, and the first power supply unit 62 provided electric energy; when the first power supply unit 62 When the output voltages of both the first power supply unit 62 and the second power supply unit 63 are greater than or equal to the first set voltage value, the first power supply unit 62 and the second power supply unit 63 provide electric energy at the same time.

As shown in Figure 3, it is an embodiment of the power control unit 61, the power control unit 61 includes a selection chip A1, the pin G1 of the selection chip A1 is electrically connected with the control terminal of the switch tube Q19, that is, the gate, and the selection chip The pin E1 of A1 is electrically connected to the output voltage terminal DV50-1 of the first power supply unit 62 (not shown in FIG. DV50-1 and the anode of the reverse diode D1 are electrically connected, the cathode of the reverse diode D1 is electrically connected to the output end of the switch tube Q19, that is, the source, and the digital voltage DV50 is output, and the pin G2 of the selection chip A1 and the control of the switch tube Q20 terminal, that is, the gate is electrically connected, and the pin V2 of the selection chip A1 is electrically connected with the input terminal of the switch tube Q20, that is, the drain, the output voltage DV50-2 of the second power supply unit 63, and the anode of the reverse diode D3, respectively, and the reverse diode D3 The cathode of D3 and the output end of the switching tube Q20, that is, the source, are electrically connected to the cathode of the reverse diode D1 respectively, the pin VS of the selection chip A1 is electrically connected to one end of the inductance L1, and the other end of the inductance L1 is respectively connected to the capacitor C1 and the capacitor C2 is electrically connected to one end of the resistor R35 and outputs an analog voltage AV50, the other end of the capacitor C1 and the capacitor C2 are electrically connected to one end of the inductor L2 and electrically connected to the ground GND, and the other end of the resistor R35 is electrically connected to the anode of the light emitting diode D2 , the cathode of the light emitting diode D2 is electrically connected to one end of the inductor L2 and to the ground GND, and the other end of the inductor L2 is electrically connected to the pin GND and the pin E2 of the selection chip A1 and is electrically connected to the ground GND. Determine whether the output voltage DV50-1 and the output voltage DV50-2 are less than the first voltage setting value by selecting the chip A1. In this embodiment, the first voltage setting value is 5V, that is, the output voltage DV50-1 of the first power supply unit 62 When it is less than 5V, the selection chip A1 will control the switch tube Q19 to disconnect, and the first power supply unit 62 will not be able to provide electric energy, but it will not affect the power supply of the second power supply unit 63; when the output voltage DV50-2 of the second power supply unit 63 is less than When 5V, the selection chip A1 will control the switching tube Q20 to turn off, and the second power supply unit 63 will not be able to provide electric energy, but it will not affect the power supply of the first power supply unit 62; when the output voltage DV50-1 and the output voltage DV50-2 are greater than or equal to At 5V, the first power supply unit 62 and the second power supply unit 63 provide electric energy at the same time, so when one of the power supply units fails, the electronic parking brake system can still be guaranteed, so the safety of the electronic parking brake system can be improved sex and reliability.

In a specific implementation, in order to prevent the output signals of the first control module 2 and the second control module 3 from interfering with each other, the electronic parking brake system further includes a first isolation module and a second isolation module for signal isolation, so The input end of the first isolation module is electrically connected to the output end of the first control module 2, the input end of the second isolation module is electrically connected to the signal output end of the second control module 3, and the output of the first isolation module and the second isolation module terminals are respectively electrically connected to the input terminals of the drive module 5, and the enabling output terminals of the second control module 3 are respectively electrically connected to the control terminals of the first isolation module and the second isolation module; the power module 6 is also It is used for providing electric energy to the first isolation module and the second isolation module.

In a specific implementation, the drive module 5 can be a relay drive circuit or an H-bridge drive circuit, and both the first isolation module and the second isolation module are electrically connected to the relay drive circuit or the H-bridge drive circuit. When the second control module 3 receives When a fault signal occurs in the first control module 2, the first control module 2 is controlled to stop working, and at the same time, the first isolation module used for isolation is also stopped through the enabling signal to prevent interference with the second isolation module output control signal.

In specific implementation, in order to further provide the safety and reliability of the system, as shown in Figure 2, the drive module 5 includes a first drive unit 51 for driving the first motor and a second drive unit for driving the second motor 52, the first isolation module includes the first isolation unit 71 and the second isolation unit 72, the second isolation module includes the third isolation unit 73 and the fourth isolation unit 74, the first isolation unit 71 and the The output terminal of the third isolation unit 73 is electrically connected to the first drive unit 51, and the output terminals of the second isolation unit 72 and the fourth isolation unit 74 are electrically connected to the second drive unit 52;

The second control module 3 is also used to control the first isolation unit 71 or the third isolation unit 73 to stop working and control the second The isolation unit 72 and the fourth isolation unit 74 start to work.

As shown in Figure 4, in this embodiment, the first control module 2 is the first control chip A2, the second control module 3 is the second control chip A3, the first isolation unit 71 is the first isolation chip U1, The second isolating unit 72 is the second isolating chip U2, the third isolating unit 73 is the third isolating chip U3, the fourth isolating unit 74 is the fourth isolating chip U4, of course the first isolating unit 71, the second isolating unit 72, the The three isolation units 73 and the fourth isolation unit 74 may also be isolation circuits composed of triodes, which is common knowledge in the art and will not be described here.

In a specific implementation, the first isolation chip U1, the second isolation chip U2, the third isolation chip U3 and the fourth isolation chip U4 are powered by the digital voltage DV50 output by the power control unit 61, and the first control chip A2 The output terminals are respectively electrically connected to the pins 1D-8D of the first isolation chip U1 and the pins 1D-8D of the second isolation chip U2, and the signal output terminals of the second control chip A3 are respectively connected to the pins 1D-8D of the third isolation chip U3. -8D and the pin 1D-8D of the fourth isolation chip U4 are electrically connected, and the enable output end of the second control chip A3 is respectively connected to the first isolation chip U1, the second isolation chip U2, the third isolation chip U3 and the first isolation chip U3. The pins OC of the four isolation chips U4 are electrically connected.

When the first control chip A2 works normally and the first drive unit 51 can work normally, the second control chip A3 controls the pin OC of the first isolation chip U1 to be at a high level, and the pin OC of the second isolation chip U2 is at a low level Level, so that the first control signal sent by the first control chip A2 is output through the first isolation chip U1, and the first driving unit 51 is controlled to drive the motor to rotate forward or reversely, so as to realize parking or unparking.

When the first control chip A2 works normally, and the first drive unit 51 breaks down and the second drive unit 52 can work normally, the second control chip A3 controls the pin OC of the first isolation chip U1 to be low level, and the second The pin OC of the isolation chip U2 is at a high level, so that the first control signal sent by the first control chip A2 is output through the second isolation chip U2, and the second drive unit 52 is controlled to drive the motor to perform forward rotation or reverse rotation, thereby realizing parking. car or release.

When the first control chip A2 breaks down and the first drive unit 51 can work normally, the second control chip A3 controls the pins OC of the first isolation chip U1 and the second isolation chip U2 to be low level, and the third isolation chip The pin OC of U3 is at a high level, and the pin OC of the fourth isolation chip U4 is at a low level, so that the second control signal sent by the second control chip A3 is output through the third isolation chip U3 to control the first drive unit 51 Drive the motor to rotate forward or reverse, so as to realize parking or unparking.

When the first control chip A2 fails and the first drive unit 51 also has a fault, and the second drive unit 52 can work normally, the second control chip A3 controls the pins OC of the first isolation chip U1 and the second isolation chip U2 to be equal to each other. is low level, the pin OC of the third isolation chip U3 is low level, and the pin OC of the fourth isolation chip U4 is high level, so that the second signal sent by the second control chip A3 is output through the fourth isolation chip U4. The control signal controls the second drive unit 52 to drive the motor to rotate forward or reverse, so as to realize parking or unparking.

And, because there are two drive units in this system, i.e. the first drive unit 51 and the second drive unit 52, when one of the drive units breaks down, the other drive unit can work, so you can avoid parking or unlocking as much as possible. It can further improve the security and reliability of the system.

In a specific implementation, the first drive unit 51 and the second drive unit 52 are respectively a relay drive circuit and/or an H-bridge drive circuit, that is, the first drive unit 51 and the second drive unit 52 may both be relay drive circuits, Also can all be H-bridge driving circuit, certainly also can be that the first driving unit 51 is a relay driving circuit, the second driving unit 52 is an H-bridge driving circuit, or the first driving unit 51 is an H-bridge driving circuit, and the second driving unit 51 is a relay driving circuit. Unit 52 is a relay drive circuit.

As shown in Figure 5 and Figure 6, the relay driving circuit in this embodiment includes a voltage amplifier U7, a first relay U6, a second relay U8 and four relay isolation circuits, the input terminals of the voltage amplifier U7 are respectively isolated from the first The output terminals J1-J4 of the chip U1 and the third isolation chip U3 are electrically connected, and the output terminals of the voltage amplifier U7 are respectively electrically connected with the input terminals of the first relay U6 and the second relay U8, wherein the four relay isolation circuits are the first A relay isolation circuit, a second relay isolation circuit, a third relay isolation circuit and a fourth relay isolation circuit, the output terminal L3 of the first relay U6 is electrically connected to the third relay isolation circuit, the output terminal L4 of the first relay U6 is connected to the second relay isolation circuit The four relay isolation circuits are electrically connected, the output terminal L1 of the second relay U8 is electrically connected to the first relay isolation circuit, and the output terminal L2 of the second relay U8 is electrically connected to the second relay isolation circuit. Fig. 6 only shows the circuit structure of the first relay isolating circuit and the second relay isolating circuit electrically connected with the second relay U8, and the third relay isolating circuit and the fourth relay isolating circuit electrically connected with the first relay U6 are connected with it have the same circuit structure.

Since the vehicle needs to be realized by two motors in the process of parking, the relay drive circuit is provided with two relays, namely the first relay U6 and the second relay U8 to respectively drive the two motors, and the first relay U6 drives the first Motor, the second relay U8 drives the second motor, and the driving process of the first relay U6 is the same as that of the second relay U8, and only the second relay U8 drives another motor will be described below.

The first relay isolation circuit includes a first voltage dividing resistor R59, a second voltage dividing resistor R54 and a P-type switch tube Q21, and the control terminal of the P-type switch tube Q21, that is, the gate, is connected to the first voltage dividing resistor R59 and the second voltage-dividing resistor R59 respectively. One end of the voltage dividing resistor R54 is electrically connected, the other end of the first voltage dividing resistor R59 is electrically connected to the output terminal J5 of the first isolation chip U1 and the third isolation chip U3 respectively, and the input terminal of the P-type switch tube Q21 It is electrically connected to the output terminal L1 of the second relay U8, and the output terminal L11 of the P-type switch tube Q21 is electrically connected to one end of the motor; the second relay isolation circuit includes a first voltage dividing resistor R58, a second voltage dividing resistor R55 and The P-type switch tube Q23, the control end of the P-type switch tube Q23 is electrically connected to one end of the first voltage dividing resistor R58 and the second voltage dividing resistor R55 respectively, and the other end of the first voltage dividing resistor R58 is respectively connected to the second voltage dividing resistor R55. An isolation chip U1 is electrically connected to the output terminal J6 of the third isolation chip U3, the other ends of the second voltage dividing resistors R54 and R55 are respectively electrically connected to the VCC power supply, and the input terminal of the P-type switch tube Q23 is connected to the second The output end L2 of the relay U8 is electrically connected, and the output end L12 of the P-type switch tube Q23 is electrically connected to the other end of the motor.

When the first isolation chip U1 or the third isolation chip U3 works normally, the output terminal J1-J8 of the first isolation chip U1 or the third isolation chip U3 outputs the first control signal, and drives the second relay U8 through the output terminal J1-J4 The output terminal L1 of the second relay U8 is connected to the power supply VCC and the output terminal L2 is connected to the ground GND, or the output terminal L2 of the second relay U8 is connected to the power supply VCC and the output terminal L1 is connected to the ground GND, and is triggered by the output terminal J5 The P-type switch tube Q21 of the first relay isolation circuit is turned on, and the P-type switch tube Q23 of the second relay isolation circuit is triggered to be turned on through the output terminal J6. When the output terminal L1 of the second relay U8 is connected to the power supply VCC and the output terminal L2 connected to the ground GND, then the output terminal L11 of the P-type switching tube Q21 is positive, and the output terminal L12 of the P-type switching tube Q23 is negative, thereby driving the second motor to rotate forward; when the output of the second relay U8 The terminal L2 is connected to the power supply VCC and the output terminal L1 is connected to the ground GND, then the output terminal L11 of the P-type switching tube Q21 is negative, and the output terminal L12 of the P-type switching tube Q23 is positive, so as to drive the second motor. reverse.

In a specific implementation, when the first drive unit 51 is the main drive circuit and the first drive unit 51 is a relay drive circuit, the relay drive circuit may also include a first detection resistor R38 and a second detection resistor R51, the first detection resistor One end of R38 is electrically connected to the pin NC of the first relay U6 and the input end of the second control module 3, and one end of the second detection resistor R51 is respectively connected to the pin NC of the second relay U8 and the input of the second control module 3. The other ends of the first detection resistor R38 and the second detection resistor R51 are electrically connected to the ground GND respectively.

Its working principle is as follows: the second control module 3 respectively detects the voltages at both ends of the first detection resistor R38 and the second detection resistor R51, and when one of the two voltage values is less than the second set voltage value, the second control module Module 3 controls the output terminals J1-J8 of the first isolation chip U1 or the third isolation chip U3 to stop outputting control signals, so that the relay drive circuit stops working, and at the same time controls the output terminals of the second isolation chip U2 or the fourth isolation chip U4 to start outputting The control signal makes the second driving unit 52 start to work.

The second driving unit 52 in this embodiment can be an H-bridge driving circuit. Since two motors need to be driven, the second driving unit 52 also includes two H-bridge driving circuits, and the working principles of the two H-bridge driving circuits are the same , the following is a detailed description of one of the H-bridge drive circuits.

As shown in FIG. 7 , the H-bridge driving circuit includes two first driving circuits, two second driving circuits and two third driving circuits, which will be described respectively below.

One of the first driving circuits includes a third voltage dividing resistor R74, a fourth voltage dividing resistor R71 and a P-type switching tube Q26, and the control terminal of the P-type switching tube Q26 is connected to the third voltage dividing resistor R74 and the fourth voltage dividing tube respectively. One end of the resistor R71 is electrically connected, the other end of the third voltage dividing resistor R74 is electrically connected to the output port PortA of the second isolation chip U2 and the fourth isolation chip U4, and the other end of the fourth voltage dividing resistor R71 is electrically connected to The input terminals of the P-type switching transistor Q26 are respectively electrically connected to the VCC power supply.

And another first drive circuit includes a third voltage dividing resistor R75, a fourth voltage dividing resistor R69 and a P-type switch tube Q28, and the control terminal of the P-type switch tube Q28 is connected to the third voltage dividing resistor R75 and the fourth voltage dividing resistor R75 respectively. One end of the piezoresistor R69 is electrically connected, the other end of the third voltage dividing resistor R75 is electrically connected to the output port PortC of the second isolation chip U2 and the fourth isolation chip U4, and the other end of the fourth voltage dividing resistor R69 and the input end of the P-type switching transistor Q28 are respectively electrically connected to the VCC power supply.

One of the second drive circuits includes a fifth voltage dividing resistor R85 and an N-type switch tube, the control terminal of the N-type switch tube Q33 is electrically connected to one end of the fifth voltage dividing resistor R85, and the other ends of the fifth voltage dividing resistor R85 are respectively It is electrically connected to the output terminal PortB of the second isolation chip U2 and the fourth isolation chip U4, the output terminal of the N-type switch tube Q33 is electrically connected to the output terminal of the P-type switch tube Q26, and the input terminal of the N-type switch tube Q33 is electrically connected to the output terminal of the P-type switch tube Q26. Ground GND electrical connection.

And another second drive circuit includes a fifth voltage dividing resistor R86 and an N-type switch tube Q35, the control terminal of the N-type switch tube Q35 is electrically connected to one end of the fifth voltage dividing resistor R86, and the other end of the fifth voltage dividing resistor R86 One end is electrically connected to the output ports PortD of the second isolation chip U2 and the fourth isolation chip U4 respectively, the output end of the N-type switch tube Q35 is electrically connected to the output end of the P-type switch tube Q28, and the input port of the N-type switch tube Q35 terminal is electrically connected to the ground GND.

One of the third drive circuits includes the seventh voltage dividing resistor R89, the eighth voltage dividing resistor R80 and the P-type switch tube Q30, and the control terminal of the P-type switch tube Q30 is connected with the seventh voltage dividing resistor R89 and the eighth voltage dividing resistor R89 respectively. One end of the resistor R80 is electrically connected, the other end of the seventh voltage dividing resistor R89 is electrically connected to the output port PortE of the second isolation chip U2 and the fourth isolation chip U4, and the other end of the eighth voltage dividing resistor R80 is connected to the VCC power supply Electrically connected, the input end of the P-type switch tube Q30 is electrically connected to the output end of the N-type switch tube Q33, and the output end L11 of the P-type switch tube Q30 is electrically connected to one end of the motor.

Another third drive circuit includes a seventh voltage dividing resistor R90, an eighth voltage dividing resistor R81 and a P-type switching tube Q31, and the control terminal of the P-type switching tube Q31 is connected to the seventh voltage dividing resistor R90 and the eighth voltage dividing resistor R90 respectively. One end of the resistor R81 is electrically connected, the other end of the seventh voltage dividing resistor R90 is electrically connected to the output port PortF of the second isolation chip U2 and the fourth isolation chip U4, and the other end of the eighth voltage dividing resistor R81 is connected to the VCC power supply Electrically connected, the input end of the P-type switch tube Q31 is electrically connected to the output end of the N-type switch tube Q35, and the output end L12 of the P-type switch tube Q31 is electrically connected to the other end of the motor.

The working principle of the H-bridge driving circuit is briefly described as follows: when the second control module 3 controls the signal output terminals PortA, PortE, PortF and PortD of the second isolation chip U2 or the fourth isolation chip U4 to output the second control signal, the P-type switch tube Q26, Q30, Q31 and N-type switch tube Q35 are turned on, so that the output terminal L11 of the P-type switch tube Q30 is positive, and the output terminal L12 of the P-type switch tube Q31 is negative, thereby realizing the forward rotation of the motor; When the second control module 3 controls the signal output terminals PortC, PortF, PortE and PortB of the second isolation chip U2 or the fourth isolation chip U4 to output the second control signal, the P-type switch tubes Q28, Q31, Q30 and N-type switch tubes Q33 is turned on, so that the output terminal L11 of the P-type switching tube Q30 is negative, and the output terminal L12 of the P-type switching tube Q31 is positive, thereby realizing the reverse rotation of the motor.

In a specific implementation, when the first drive unit 51 is the main drive circuit, and the first drive unit 51 is an H-bridge drive circuit, as shown in FIG. 7, the H-bridge drive circuit also includes a third detection resistor R100 and a first Four detection resistors R101, the third detection resistor R100 is set between the input terminal of the N-type switch tube Q33 and the ground GND, the fourth detection resistor R101 is set between the input terminal of the N-type switch tube Q35 and the ground GND, the second control The module 3 respectively detects the voltages at both ends of the third detection resistor R100 and the fourth detection resistor R101, and when one of the two voltage values is less than the second set voltage value, the second control module 3 controls the second isolation chip U2 Or the signal output terminal of the fourth isolation chip U4 stops outputting the control signal, so that the H bridge drive circuit stops working, and simultaneously controls the output terminal of the first isolation chip U1 or the third isolation chip U3 to start outputting the control signal, so that the second drive unit 52 to work.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (9)

1. electronic brake system, it is characterized in that, comprise switch module, first control module, second control module that is electrically connected with first control module, the monitoring modular that is electrically connected with first control module and second control module respectively, driver module and the power module that is electrically connected with first control module and second control module respectively, described power module is electrically connected with switch module, first control module, second control module, monitoring modular and driver module respectively;

Power module is used for to described switch module, first control module, and second control module, monitoring modular and driver module provide electric energy;

First control module is used for according to the user first control signal being exported in the operation of switch module, and output status signal;

Monitoring modular is used for judging according to the status signal of first control module, output breakdown signal when first control module breaks down;

Second control module is controlled first control module when being used to receive the breakdown signal of monitoring modular and is quit work, and according to the user second control signal is exported in the operation of switch module then;

Driver module is used for according to first control signal or second control signal, drive motor work.

2. electronic brake system as claimed in claim 1, it is characterized in that, first power subsystem unit and second source unit that described power module comprises power control unit and is used to provide electric energy, described first power subsystem unit and second source unit are electrically connected with the input end of described power control unit respectively, the mouth of described power control unit respectively with switch module, first control module, second control module, monitoring modular and driver module are electrically connected;

Power control unit when being used for output voltage when first power subsystem unit or second source unit less than first setting voltage value, being controlled this power subsystem unit and is quit work.

3. electronic brake system as claimed in claim 2, it is characterized in that, described electronic brake system also comprises first isolation module and second isolation module that is used for Signal Spacing, the input end of described first isolation module is electrically connected with the first control module mouth, the input end of second isolation module is electrically connected with the signal output part of second control module, the mouth of first isolation module and second isolation module is electrically connected with the input end of described driver module respectively, and the control end of described first isolation module and second isolation module is electrically connected with the mouth that enables of second control module respectively;

Described power module also is used for providing electric energy to described first isolation module and second isolation module.

4. electronic brake system as claimed in claim 3, it is characterized in that, described driver module comprises second driver element that is used to drive first driver element of first motor and is used to drive second motor, described first isolation module comprises first isolated location and second isolated location, described second isolation module comprises the 3rd isolated location and the 4th isolated location, the mouth of described first isolated location and the 3rd isolated location is electrically connected with first driver element, and the mouth of described second isolated location and the 4th isolated location is electrically connected with second driver element;

Described second control module also is used for when the sampled voltage that receives first driver element is lower than second setting voltage value, controls first isolated location or the 3rd isolated location and quits work and control two isolated locations or the 4th isolated location is started working.

5. electronic brake system as claimed in claim 4 is characterized in that, described first driver element and second driver element are respectively relay drive circuit and/or H bridge driving circuit.

6. electronic brake system as claimed in claim 5, it is characterized in that, described relay drive circuit comprises voltage amplifier, first relay, second relay and four relay buffer circuits, the input end of described voltage amplifier is electrically connected with the mouth of first isolated location and the 3rd isolated location respectively, the mouth of described voltage amplifier is electrically connected with the input end of first relay and second relay respectively, wherein said each relay buffer circuit comprises first divider resistance, second divider resistance and P type switching valve, described P type control end of switching tube is electrically connected with an end of first divider resistance and second divider resistance respectively, the other end of described first divider resistance is electrically connected with the mouth of first isolated location and the 3rd isolated location respectively, the other end of described second divider resistance is electrically connected with the VCC power supply, wherein the input end of P type switching valve is electrically connected with the mouth of first relay in two relay buffer circuits, and described P type output end of switching tube is electrically connected with described first motor, the input end of P type switching valve is electrically connected with the mouth of second relay in two other relay buffer circuit, and described P type output end of switching tube is electrically connected with described second motor.

7. electronic brake system as claimed in claim 5 is characterized in that, described H bridge driving circuit comprises two first driving circuits, two second driving circuits and two the 3rd driving circuits;

Each first driving circuit is drawn together the 3rd divider resistance, the 4th divider resistance and P type switching valve, described P type control end of switching tube is electrically connected with an end of the 3rd divider resistance and the 4th divider resistance respectively, the other end of described the 3rd divider resistance is electrically connected with the mouth of second isolated location and the 4th isolated location respectively, and the other end of described the 4th divider resistance and described P type output end of switching tube are electrically connected with the VCC power supply respectively;

Each second driving circuit comprises the 5th divider resistance and N type switching valve, described N type control end of switching tube is electrically connected with the 5th divider resistance one end, the other end of the 5th divider resistance is electrically connected with the mouth of second isolated location and the 4th isolated location respectively, N type output end of switching tube is electrically connected with the input end of described P type switching valve, the input end of N type switching valve be electrically connected;

Each the 3rd driving circuit comprises the 7th divider resistance, the 8th divider resistance and P type switching valve, described P type control end of switching tube is electrically connected with an end of the 7th divider resistance and the 8th divider resistance respectively, the other end of described the 7th divider resistance is electrically connected with the mouth of second isolated location and the 4th isolated location respectively, the other end of the 8th divider resistance is electrically connected with the VCC power supply, the input end of described P type switching valve is electrically connected with N type output end of switching tube, and described P type output end of switching tube is electrically connected with motor.

8. electronic brake system as claimed in claim 1 is characterized in that, described monitoring modular is a watchdog circuit.

9. electronic brake system as claimed in claim 1 is characterized in that, described driver module is relay drive circuit or H bridge driving circuit.

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