Integrated electronic parking brake actuating mechanism, system and vehicle

Abstract

The utility model relates to an integrated electronic parking brake actuating mechanism, a system and a vehicle. The brake actuating mechanism comprises a main control unit, a left caliper motor driving unit, an auxiliary control unit and a right caliper motor driving unit, the main control unit is connected with the left caliper motor driving unit and the auxiliary control unit and used for controlling the left caliper motor driving unit to drive a left caliper motor to clamp or release a caliper according to an EPB switch signal or a P-gear key signal and sending a clamping or releasing instruction to the auxiliary control unit. The auxiliary control unit is connected with the main control unit and the right caliper motor driving unit and used for controlling the right caliper motor driving unit to drive a right caliper motor to clamp the caliper according to the P-gear key signal. And according to the clamping or releasing instruction sent by the main control unit, the right caliper motor driving unit is controlled to drive the right caliper motor to clamp or release the caliper. After the P-gear parking mechanism is cancelled, the device can still meet the requirements of laws and regulations, and is high in integration level and low in implementation cost.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle braking, and in particular to an integrated electronic parking brake actuator, a system and a vehicle. Background Art

[0002] The Integrated Electronic Parking Brake System (EPBi) integrates the control function software of the electronic parking system into the electric stability control (ESC) actuator. This design not only meets the needs of reducing costs and weight in automobile manufacturing, but also improves the comfort and safety of the car.

[0003] As the automotive industry's requirements for cost control increase, automakers have eliminated the P-position parking mechanism in the transmission, and the parking function is replaced by EPBi. However, the regulation GB216704.2.19.2 requires that when the internal electronic control transmission, the external line of the electronic control unit except the power supply line is damaged or the control unit fails, the parking brake can still be applied from the driver's position and the fully loaded vehicle can remain stationary on an 8% up and down slope. However, when the P-position parking mechanism is eliminated, the regulatory requirements cannot be met. Utility Model Content

[0004] One of the purposes of the present utility model is to provide an integrated electronic parking brake actuator to solve the problem that existing vehicles cannot meet regulatory requirements after the P-position parking mechanism is cancelled; the second purpose of the present utility model is to provide an integrated electronic parking brake system; the third purpose of the present utility model is to provide a vehicle.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] In the first aspect, the utility model provides an integrated electronic parking brake actuator, which includes a main control unit, a left caliper motor drive unit, an auxiliary control unit and a right caliper motor drive unit; wherein the main control unit is connected to the left caliper motor drive unit and the auxiliary control unit respectively, and the main control unit is used to control the left caliper motor drive unit to drive the left caliper motor to clamp or release the caliper according to the EPB switch signal or the P gear key signal, and send the clamping or releasing instruction to the auxiliary control unit; the auxiliary control unit is connected to the main control unit and the right caliper motor drive unit respectively, and is used to control the right caliper motor drive unit to drive the right caliper motor to clamp the caliper according to the P gear key signal, and control the right caliper motor drive unit to drive the right caliper motor to clamp or release the caliper according to the clamping or releasing instruction sent by the main control unit.

[0007] In the above technical solution, an auxiliary control unit and a right caliper motor drive unit are added on the basis of the original integrated electronic parking brake system, and communication between the main control unit and the auxiliary control unit is established. When the integrated electronic parking brake system is working normally, the main control unit responds to the driver's request when receiving the EPB switch signal or the P gear key signal operated by the driver, and controls the left caliper motor drive unit to drive the left caliper motor to clamp or release the caliper after the parking condition is met, and sends a clamping or releasing instruction to the auxiliary control unit through the internal communication interface. After receiving the instruction from the main control unit, the auxiliary control unit controls the right caliper motor drive unit to control the right caliper motor to clamp or release the caliper. When the main control unit fails, after the parking condition is met, the auxiliary control unit controls the right caliper motor drive unit to drive the right caliper motor to clamp or release the caliper according to the P gear key signal to achieve the purpose of parking, so that the regulatory requirements can still be met after the P gear parking mechanism is cancelled. Furthermore, the utility model adds some electronic components on the basis of the original integrated electronic parking brake system, the overall appearance size and installation size of the circuit board remain unchanged, the integration level is high, and the implementation cost is low.

[0008] Furthermore, the main control unit includes a main transceiver unit and a first microcontroller unit; the main transceiver unit is connected to the first microcontroller unit for feeding back the wheel speed signal and the P gear button signal to the first microcontroller unit; the first microcontroller unit is respectively connected to the left caliper motor drive unit and the auxiliary control unit.

[0009] In the above technical solution, the main control unit adopts a micro control unit, and the main transceiver unit can receive the wheel speed signal from the vehicle body CAN bus, and know whether the vehicle is in a stopped state according to the wheel speed signal, that is, whether the parking condition is met. When the parking condition is met and when the P gear button signal is received, the left caliper motor drive unit will be controlled to drive the left caliper motor to clamp the caliper to realize the parking function.

[0010] Furthermore, the left caliper motor drive unit includes a first drive chip and a first H-bridge motor control circuit; the first drive chip is respectively connected to the first microcontroller unit and the first H-bridge motor control circuit, and is used to control the first H-bridge motor control circuit to drive the left caliper motor to clamp or release the caliper; the first H-bridge control circuit is connected to the left caliper motor.

[0011] In the above technical solution, under the control of the first micro control unit, the first driver chip can further control the operation of the first H-bridge motor control circuit, thereby controlling the left caliper motor to be in a clamping or releasing state. At the same time, the first driver chip can feed back the working state of the left caliper motor to the first micro control unit, so that other controllers can know the current working state of the left caliper motor.

[0012] Furthermore, the auxiliary control unit includes a second microcontroller unit, an auxiliary power management chip and an auxiliary transceiver unit; wherein the auxiliary transceiver unit is connected to the second microcontroller unit and is used to feed back the transmission speed signal and the P gear button signal to the second microcontroller unit; the auxiliary power management chip is connected to the second microcontroller unit and is used to wake up the second microcontroller unit when the main control unit receives the EPB switch signal.

[0013] In the above technical solution, after the main control unit receives the EPB switch signal, the power management chip can synchronously receive the EPB switch signal to wake up the second micro control unit. The auxiliary transceiver unit can receive the transmission speed signal from the vehicle body CAN bus, and know whether the vehicle is in a stopped state according to the transmission speed signal, that is, whether the parking condition is met. When the parking condition is met, and when the P gear button signal is received, the second drive chip will be controlled to drive the right caliper motor to clamp the caliper to achieve the parking function.

[0014] Furthermore, the right caliper motor drive unit includes a second drive chip and a second H-bridge motor control circuit; wherein, the second drive chip is respectively connected to the second microcontroller unit and the second H-bridge motor control circuit, and is used to control the second H-bridge motor control circuit to drive the right caliper motor to clamp or release the caliper; the second H-bridge motor control circuit is connected to the right caliper motor.

[0015] In the above technical solution, under the control of the second micro control unit, the second driver chip can further control the operation of the second H-bridge motor control circuit, thereby controlling the right caliper motor to be in a clamping or releasing state. At the same time, the second driver chip can feed back the working state of the right caliper motor to the second micro control unit, so that other controllers can know the current working state of the left caliper motor.

[0016] Furthermore, the first driver chip and the second driver chip are both application specific integrated circuits.

[0017] In the second aspect, the utility model provides an integrated electronic parking brake system, including a P-position push button switch unit, an EPB switch unit and the integrated electronic parking brake actuator as described above; the integrated electronic parking actuator structure is respectively connected to the P-position push button switch unit and the EPB switch unit.

[0018] Furthermore, the P gear key switch unit is connected to the main control unit and the auxiliary control unit via a vehicle body CAN bus.

[0019] Furthermore, it also includes an EPB switch indicator light, and the EPB switch indicator light is connected to the auxiliary control unit.

[0020] In the above technical solution, when the main control unit fails, the auxiliary control unit can control the EPB switch indicator light to light up.

[0021] In a third aspect, the utility model provides a vehicle, which includes the integrated electronic parking brake system as described above.

[0022] Beneficial effects of the utility model:

[0023] (1) When the main control unit fails, after the parking condition is met, the auxiliary control unit controls the right caliper motor drive unit to drive the right caliper motor to clamp or release the caliper according to the P gear key signal to achieve the purpose of parking, so that the regulatory requirements can still be met after the P gear parking mechanism is cancelled;

[0024] (2) Some electronic components are added to the original integrated electronic parking brake system, and the overall appearance and installation dimensions of the circuit board remain unchanged. The structure is simple, the integration level is high, and the implementation cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the integrated electronic parking brake system in the present invention.

[0026] Figure 2 It is a principle block diagram of the integrated electronic parking brake system in the utility model.

[0027] Figure 3 This is a schematic diagram of a main control unit and a left caliper motor driving unit driving a left caliper motor in one embodiment of the utility model.

[0028] Figure 4 This is a schematic diagram of the auxiliary control unit and the right caliper motor driving unit driving the right caliper motor in one embodiment of the utility model.

[0029] Among them, 100, main control unit; 110, first micro control unit; 120, main transceiver unit; 200, left caliper motor drive unit; 210, first drive chip; 220, first H-bridge motor control circuit; 300, auxiliary control unit; 310, second micro control unit; 320, auxiliary power management chip; 330, auxiliary transceiver unit; 400, right caliper motor drive unit; 410, second drive chip; 420, second H-bridge motor control circuit; 500, P gear button switch unit; 600, EPB switch unit; 700, EPB switch indicator light. DETAILED DESCRIPTION

[0030] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0032] See also Figure 1 and Figure 4 , this embodiment proposes an integrated electronic parking brake system.

[0033] like Figure 1 and Figure 2 As shown, the utility model provides an integrated electronic parking brake system, which includes a P gear key switch unit 500, an EPB switch unit 600 and an integrated electronic parking brake actuator. The integrated electronic parking actuator is connected to the P gear key switch unit 500 and the EPB switch unit 600 respectively.

[0034] In some embodiments, the integrated electronic parking brake actuator includes a main control unit 100, a left caliper motor drive unit 200, an auxiliary control unit 300 and a right caliper motor drive unit 400; wherein the main control unit 100 is connected to the left caliper motor drive unit 200 and the auxiliary control unit 300, respectively, and the main control unit 100 is used to control the left caliper motor drive unit 200 to drive the left caliper motor to clamp or release the caliper according to the EPB switch signal or the P gear key signal, and send the clamping or releasing instruction to the auxiliary control unit 300; the auxiliary control unit 300 is connected to the main control unit 100 and the right caliper motor drive unit 400, respectively, and is used to control the right caliper motor drive unit 400 to drive the right caliper motor to clamp the caliper according to the P gear key signal, and control the right caliper motor drive unit 400 to drive the right caliper motor to clamp or release the caliper according to the clamping or releasing instruction sent by the main control unit 100.

[0035] In this embodiment, please combine Figure 3 and Figure 4The original integrated electronic parking brake system includes a main control unit 100, a left caliper motor drive unit 200, a main power management chip (ASIC1), a wheel speed management chip (ASIC2), an inertial measurement unit (IMU), a boost motor, etc. The utility model adds an auxiliary control unit 300 and a right caliper motor drive unit 400 on the basis of the original integrated electronic parking brake system, and establishes communication between the main control unit 100 and the auxiliary control unit 300. When the integrated electronic parking brake system is working normally, the main control unit 100 responds to the driver's request when receiving the EPB switch signal or the P gear button signal operated by the driver. After the parking condition is met, the left caliper motor drive unit 200 is controlled to drive the left caliper motor to clamp or release the caliper, and at the same time, a clamping or releasing instruction is sent to the auxiliary control unit 300 through the internal communication interface. After receiving the instruction of the main control unit 100, the auxiliary control unit 300 controls the right caliper motor drive unit 400 to drive the right caliper motor to clamp or release the caliper. After the auxiliary control unit 300 completes the action, the right caliper status is fed back to the main control unit 100. After the main control unit 100 receives the status of the right caliper motor fed back by the auxiliary control unit 300, it combines the caliper status of the left caliper motor controlled by itself and processes it before sending the caliper status of the entire vehicle (calipers on both sides are clamped / released) to other controllers through the vehicle body CAN bus, so that other controllers can know the caliper status. When the main control unit 100 fails, after the parking conditions are met, the auxiliary control unit 300 controls the right caliper motor drive unit 400 to drive the right caliper motor to clamp or release the caliper according to the P gear button signal to achieve the parking purpose. It can be seen that the utility model can still meet regulatory requirements after the P gear parking mechanism is cancelled. Moreover, the utility model adds some electronic components on the basis of the original integrated electronic parking brake system, and only adjusts the circuit board layout of the original EPBi actuator. The overall appearance and installation dimensions of the circuit board remain unchanged, that is, the circuit board area will not increase, and the appearance of the existing EPBi actuator will not be changed. The integration is high, and the mold opening fee can be saved, thereby reducing the cost. Furthermore, the main control unit and the auxiliary control unit in the utility model each control one caliper motor, which is not only simple in structure, but also reliable in function.

[0036] The following table shows all possible failure conditions and corresponding handling measures of the parking redundancy function:

[0037]

[0038] Among them, ● indicates full function; ○ indicates no function; ◎ indicates partial function / performance degradation (can ensure that the vehicle remains stationary on an 8% uphill or downhill slope). As can be seen from the above table, after the vehicle does not have a P-position parking mechanism, the EPBi actuator with parking redundancy function of the utility model can still meet the regulatory requirements and can still perform parking brakes from the driver's position and keep the fully loaded vehicle stationary on an 8% uphill or downhill slope under all possible failure conditions.

[0039] In some embodiments, Figure 1 As shown, the P gear key switch unit 500 is connected to the main control unit 100 and the auxiliary control unit 300 by a vehicle body CAN bus. In this embodiment, the main control unit 100 and the auxiliary control unit 300 can obtain the speed signal of the gearbox and the P gear key signal through the vehicle body CAN bus, and know whether the current state of the vehicle meets the parking condition through the speed signal of the speed line, and only when the parking condition is met will the caliper motor be driven to control the caliper to clamp.

[0040] In some embodiments, Figure 2 As shown, the main control unit 100 includes a first micro control unit 110 and a main transceiver unit 120. The main transceiver unit 120 is connected to the first micro control unit 110, and is used to feed back the wheel speed signal and the P gear button signal to the first micro control unit 110; the first micro control unit 110 is respectively connected to the left caliper motor drive unit 200 and the auxiliary control unit 300.

[0041] In this embodiment, if Figure 2 and Figure 3 As shown, the main control unit 100 (MCU1) uses a microcontroller unit to control the original integrated electronic parking brake system. When the main transceiver unit 120 receives the wheel speed signal from the vehicle body CAN bus, the first microcontroller unit 110 knows whether the vehicle is in a stopped state according to the wheel speed signal, that is, whether the parking condition is met. When the parking condition is met and the P gear button signal is received, the left caliper motor drive unit 200 is controlled to drive the left caliper motor to clamp the caliper to achieve the parking function.

[0042] In some embodiments, Figure 2 and Figure 3 As shown, the left caliper motor drive unit 200 includes a first drive chip 210 and a first H-bridge motor control circuit 220; the first drive chip 210 is respectively connected to the first microcontroller unit 110 and the first H-bridge motor control circuit 220, and is used to control the first H-bridge motor control circuit 220 to drive the left caliper motor to clamp or release the caliper; the first H-bridge control circuit is connected to the left caliper motor.

[0043] In this embodiment, the first H-bridge control circuit is connected to the power supply UB_V, and the first driver chip 210, under the control of the first micro-control unit 110, can further control the operation of the first H-bridge motor control circuit 220, so as to control the left caliper motor to be in a clamped or released state. At the same time, the first driver chip 210 can feedback the working state of the left caliper motor to the first micro-control unit 110, so that other controllers can know the current working state of the left caliper motor. In one implementation, the first driver chip 210 is a dedicated integrated circuit. It should be noted that the first H-bridge motor control circuit 220 is a prior art, and therefore will not be described in detail here.

[0044] In some embodiments, the auxiliary control unit 300 includes a second microcontroller unit 310, an auxiliary power management chip 320 and an auxiliary transceiver unit 330; wherein the auxiliary transceiver unit 330 is respectively connected to the vehicle body CAN bus and the second microcontroller unit 310, and is used to feed back the transmission speed signal and the P gear button signal to the second microcontroller unit 310; the auxiliary power management chip 320 is respectively connected to the vehicle body CAN bus and the second microcontroller unit 310, and is used to wake up the second microcontroller unit 310 when the main control unit 100 receives the EPB switch signal.

[0045] In this embodiment, the auxiliary control unit 300 uses a microcontroller unit (MCU2) to control the left caliper motor. The auxiliary control unit 300 can synchronously receive the EPB switch signal to wake up the second microcontroller unit 310. The auxiliary transceiver unit 330 can receive the transmission speed signal from the vehicle body CAN bus, and know whether the vehicle is in a stopped state, that is, whether the parking condition is met according to the transmission speed signal. When the parking condition is met, and when the P gear button signal is received, the second drive chip 410 will be controlled to drive the right caliper motor to clamp the caliper to achieve the parking function.

[0046] In some embodiments, Figure 2 and Figure 4 As shown, the right caliper motor drive unit 400 includes a second drive chip 410 and a second H-bridge motor control circuit 420. The second drive chip 410 is connected to the second micro control unit 310 and the second H-bridge motor control circuit 420, respectively, and is used to control the second H-bridge motor control circuit 420 to drive the right caliper motor to clamp or release the caliper; the second H-bridge motor control circuit 420 is connected to the right caliper motor.

[0047] In this embodiment, the second H-bridge motor control circuit 420 is connected to the power supply UB_V, and the second driver chip 410, under the control of the second micro control unit 310, can further control the second H-bridge motor control circuit 420 to work, thereby controlling the right caliper motor to be in a clamping or releasing state. At the same time, the second driver chip 410 can feed back the working state of the right caliper motor to the second micro control unit 310, so that other controllers can know the current working state of the left caliper motor.

[0048] In some embodiments, Figure 2 and Figure 4 The integrated electronic parking brake system shown further includes an EPB switch indicator light 700 , which is connected to the auxiliary control unit 300 .

[0049] In this embodiment, the EPB switch indicator light 700 is connected to the auxiliary power management chip 320. When the main control unit 100 fails, the auxiliary control unit 300 can output an indicator light signal EPB_SWITCH_LED to control the EPB switch indicator light 700 to light up.

[0050] In some embodiments, the present invention provides a vehicle, which includes the integrated electronic parking brake system as described above. Specific details are as described in an embodiment of the integrated electronic parking brake system, which will not be repeated here.

[0051] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. An integrated electronic parking brake actuator, characterized in that: It includes a main control unit, a left caliper motor drive unit, an auxiliary control unit and a right caliper motor drive unit; wherein, The main control unit is connected to the left caliper motor drive unit and the auxiliary control unit respectively, and the main control unit is used to control the left caliper motor drive unit to drive the left caliper motor to clamp or release the caliper according to the EPB switch signal or the P gear button signal, and send the clamping or releasing instruction to the auxiliary control unit; The auxiliary control unit is respectively connected to the main control unit and the right caliper motor drive unit, and is used to control the right caliper motor drive unit to drive the right caliper motor to clamp the caliper according to the P gear key signal, and to control the right caliper motor drive unit to drive the right caliper motor to clamp or release the caliper according to the clamping or releasing instruction sent by the main control unit.

2. The integrated electronic parking brake actuator according to claim 1, characterized in that: The main control unit includes a main transceiver unit and a first micro control unit; The main transceiver unit is connected to the first micro control unit and is used to feed back the wheel speed signal and the P gear button signal to the first micro control unit; The first micro control unit is connected to the left caliper motor drive unit and the auxiliary control unit respectively.

3. The integrated electronic parking brake actuator according to claim 2, characterized in that: The left caliper motor drive unit includes a first drive chip and a first H-bridge motor control circuit; The first driving chip is respectively connected to the first micro control unit and the first H-bridge motor control circuit, and is used to control the first H-bridge motor control circuit to drive the left caliper motor to clamp or release the caliper; The first H-bridge motor control circuit is connected to the left caliper motor.

4. The integrated electronic parking brake actuator according to claim 3, characterized in that: The auxiliary control unit includes a second micro control unit, an auxiliary power management chip and an auxiliary transceiver unit; wherein, The auxiliary transceiver unit is connected to the second micro control unit, and is used to feed back the transmission speed signal and the P gear button signal to the second micro control unit; The auxiliary power management chip is connected to the second micro control unit and is used to wake up the second micro control unit when the main control unit receives the EPB switch signal.

5. The integrated electronic parking brake actuator according to claim 4, characterized in that: The right caliper motor drive unit includes a second drive chip and a second H-bridge motor control circuit; wherein, The second driving chip is respectively connected to the second micro control unit and the second H-bridge motor control circuit, and is used to control the second H-bridge motor control circuit to drive the right caliper motor to clamp or release the caliper; The second H-bridge motor control circuit is connected to the right caliper motor.

6. The integrated electronic parking brake actuator according to claim 5, characterized in that: The first driving chip and the second driving chip are both application specific integrated circuits.

7. An integrated electronic parking brake system, characterized in that: It comprises a P gear key switch unit, an EPB switch unit and an integrated electronic parking brake actuator as described in any one of claims 1 to 6; the integrated electronic parking brake actuator structure is connected to the P gear key switch unit and the EPB switch unit respectively.

8. The integrated electronic parking brake system according to claim 7, characterized in that: The P gear key switch unit is connected to the main control unit and the auxiliary control unit via a vehicle body CAN bus.

9. The integrated electronic parking brake system according to claim 7, characterized in that: It also includes an EPB switch indicator light, which is connected to the auxiliary control unit.

10. A vehicle, characterized in that: Comprising an integrated electronic parking brake system as described in any one of claims 7-9.

Images