Automobile electronic control unit and control method of parking brake system

Abstract

The present invention relates to an automotive electronic control unit, the automotive electronic control unit comprising: a first chip; a second chip; and a switch circuit, wherein the switch circuit is configured to connect the first chip to two DC motor control circuits and disconnect the second chip from the two DC motor control circuits when the first chip is operating normally, so that the first chip controls the parking brake motor corresponding to the two DC motor control circuits; and the switch circuit is also configured to disconnect the first chip from at least one DC motor control circuit and connect the second chip to the at least one DC motor control circuit when the first chip fails, so that the second chip controls the parking brake motor corresponding to the at least one DC motor control circuit. The present invention also relates to a vehicle body stabilization system, an automobile, a control method for a parking brake system, and a computer storage medium.

Description

Technical Field

[0001] The present invention relates to a parking brake solution, and more specifically, to an automobile electronic control unit, a vehicle body stabilization system, an automobile, a control method for a parking brake switch circuit, and a computer storage medium. Background Art

[0002] With the popularization of the automatic parking brake system (APB), in order to reduce costs and design difficulties, more and more motor vehicles have cancelled the P gear lock mechanism and adopted the automatic parking brake system instead.

[0003] For example, in the prior art, the ECU (Electronic Control Unit) controls the parking brake to achieve the parking brake of the vehicle when the vehicle stops and releases the parking brake when the vehicle starts. However, when the electronic control unit fails, the power supply fails, the wiring harness fails, or the parking brake motor and the deceleration mechanism fails, the automatic parking brake system will not work properly, and there are no additional measures to ensure the parking brake, which will cause the vehicle to lose the parking brake ability and bring safety hazards, especially when the vehicle is on a slope.

[0004] Therefore, an improved automatic parking brake system and control method thereof is desired. Summary of the invention

[0005] According to one aspect of the present invention, there is provided an automotive electronic control unit, the automotive electronic control unit comprising: a first chip; a second chip; and a switch circuit, wherein the switch circuit is configured to connect the first chip to a two-way DC motor control circuit and disconnect the second chip from the two-way DC motor control circuit when the first chip is working normally, so that the first chip controls the parking brake motor corresponding to the two-way DC motor control circuit; and

[0006] The switching circuit is also configured to disconnect the first chip from at least one DC motor control circuit when the first chip fails, and connect the second chip to the at least one DC motor control circuit, so that the second chip controls the parking brake motor corresponding to the at least one DC motor control circuit.

[0007] According to this embodiment, since an additional chip (i.e., a second chip) is added to the automotive electronic control unit that controls the parking brake motor, even when the first chip fails, the second chip can be connected to the parking brake motor corresponding to at least one DC motor control circuit by switching the switching circuit, thereby increasing the vehicle's braking capacity.

[0008] Optionally, the first chip is a dedicated custom chip and the second chip is a finished product chip. In one embodiment, the first chip is an automatic parking brake system ASIC, and the second chip is a motor driver chip L99H01.

[0009] Generally speaking, a dedicated custom chip is a chip designed and manufactured to meet the requirements of a specific user or a specific electronic system, and has the advantages of small size, light weight, and low power consumption. Finished chips are chips on the market, which can be applied to various automotive systems and are dedicated to a certain purpose or function. For example, L99H01 is an automotive motor driver chip developed by STMicroelectronics, which integrates four gate drivers to control four external N-channel MOSFET tubes in the H-bridge. The chip has a simple structure and flexible drive, making it suitable for various automotive systems. In addition, L99H01 is relatively cheap compared to the automatic parking brake system ASIC.

[0010] Optionally, the first chip is configured to periodically send an enable signal to the switch circuit during normal operation. In one embodiment, the enable signal is a high level signal.

[0011] Optionally, the switch circuit is configured to disconnect the first chip from at least one DC motor control circuit and connect the second chip to the at least one DC motor control circuit when the enable signal is not received within a predetermined period.

[0012] Optionally, the switching circuit is configured to connect the first chip with the first DC motor control circuit and the second DC motor control circuit and disconnect the second chip from the second DC motor control circuit when the first chip is working normally, so that the first chip controls the first parking brake motor and the second parking brake motor corresponding to the first DC motor control circuit and the second DC motor control circuit respectively; and the switching circuit is also configured to disconnect the first chip from the second DC motor control circuit and connect the second chip to the second DC motor control circuit when the first chip fails, so that the second chip controls the second parking brake motor corresponding to the second DC motor control circuit.

[0013] Optionally, the first parking brake motor and the second parking brake motor are respectively located on the left and right sides or the front and rear sides of the vehicle body.

[0014] Optionally, the DC motor control circuit is an H-bridge circuit.

[0015] Optionally, the parking brake motor is an integrated electronic parking motor.

[0016] According to another aspect of the present invention, a vehicle body stabilization system is provided, which includes the automotive electronic control unit as described above.

[0017] According to another aspect of the present invention, there is provided a vehicle, comprising the vehicle body stabilization system as described above.

[0018] According to another aspect of the present invention, a control method for a parking brake switch circuit is provided, the method comprising: when a first chip is working normally, connecting the first chip to two DC motor control circuits and disconnecting the second chip from the two DC motor control circuits, so that the first chip controls the parking brake motor corresponding to the two DC motor control circuits; and when the first chip fails, disconnecting the first chip from at least one DC motor control circuit, and connecting the second chip to the at least one DC motor control circuit, so that the second chip controls the parking brake motor corresponding to the at least one DC motor control circuit.

[0019] The above method may further include: periodically receiving an enable signal from the first chip.

[0020] In the above method, when the enable signal is not received within a predetermined period, the connection between the first chip and at least one DC motor control circuit is disconnected, and the second chip is connected to the at least one DC motor control circuit.

[0021] According to another aspect of the present invention, a computer storage medium is provided, wherein the medium includes instructions, and the instructions, when executed, execute the control method of the parking brake switch circuit as described above.

[0022] In summary, the technical solution of the present invention provides a safer parking brake system and control method for a vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects and advantages of the present invention will become more fully apparent from the following detailed description taken in conjunction with the accompanying drawings, wherein the same or similar elements are denoted by the same reference numerals.

[0024] Figures 1 to 3 An automotive electronic control unit according to various embodiments of the present invention is shown;

[0025] Figures 4 to 6 The working principle of the automotive electronic control unit according to the embodiment of the present invention is shown; and

[0026] Figure 7 A control method of a parking brake switch circuit according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0027] For brevity and illustrative purposes, the principles of the present invention are described herein mainly with reference to its exemplary embodiments. However, those skilled in the art will readily recognize that the same principles are equally applicable to all types of electronic control units and methods of use thereof, and that these same or similar principles may be implemented therein, and any such changes do not depart from the true spirit and scope of the present patent application.

[0028] Figure 1 FIG. 1 shows an automotive electronic control unit 1000 according to an embodiment of the present invention. Figure 1 As shown, the automotive electronic control unit 1000 includes a first chip 101, a second chip 102 and a switch circuit 103. The automotive electronic control unit 1000 may also include two DC motor control circuits 104 and 105.

[0029] exist Figure 1 In the automotive electronic control unit 1000 shown in the figure, the switch circuit 103 is configured to connect the first chip 101 with the two-way DC motor control circuits 104 and 105 and disconnect the second chip 102 from the two-way DC motor control circuits 104 and 105 when the first chip 101 is working normally, so that the first chip 101 controls the parking brake motors corresponding to the two-way DC motor control circuits 104 and 105 ( Figure 1 The switch circuit 103 is further configured to disconnect the first chip 101 from the at least one DC motor control circuit when the first chip 101 fails, and connect the second chip 102 to the at least one DC motor control circuit, so that the second chip 102 controls the parking brake motor corresponding to the at least one DC motor control circuit.

[0030] According to this embodiment, since the automotive electronic control unit 1000 includes two chips for controlling the DC motor control circuit, namely the first chip 101 and the second chip 102, even when the first chip 101 fails, the second chip 102 can be connected to the parking brake motor corresponding to at least one DC motor control circuit by switching the switch circuit 103, thereby increasing the vehicle braking capability and eliminating safety risks.

[0031] It should be pointed out that although Figure 1 In the illustrated embodiment, the DC motor control circuits 104 and 105 are shown to be within the automotive electronic control unit 1000. Those skilled in the art will appreciate that in other embodiments, the DC motor control circuits may be disposed outside the automotive electronic control unit.

[0032] In the context of the present invention, "chip" refers to an integrated circuit in an automotive electronic control unit ECU for controlling a parking brake (MoC) through a DC motor control circuit (e.g., an H-bridge circuit), wherein MoC is an abbreviation for Motor on Caliper, and the parking brake includes a motor and a caliper. The expressions "first chip" and "second chip" are used to distinguish between different integrated circuits for controlling a brake motor that are also located in the ECU.

[0033] “Switch circuit” refers to an operating unit that uses electronic circuits to realize circuit switching. In one embodiment of the present invention, the switch circuit 103 is configured to connect the first chip 101 with the two DC motor control circuits 104 and 105 and disconnect the second chip 102 from the two DC motor control circuits 104 and 105 when the first chip 101 works normally, and disconnect the first chip 101 from at least one DC motor control circuit and connect the second chip 102 to the at least one DC motor control circuit when the first chip 101 fails.

[0034] In one embodiment, the switch circuit 103 performs circuit switching according to a signal received from the outside. For example, the switch circuit 103 is configured to switch the circuit when the enable signal from the first chip 101 is not received within a predetermined period. Of course, those skilled in the art understand that the enable signal can be any predetermined signal, such as a high level signal, a square wave signal, and a low level signal, etc., which is not limited here.

[0035] exist Figure 1 In the figure, two DC motor control circuits 104 and 105 are shown as two DC motor control circuits respectively controlled by two output control signals of the switch circuit. In one embodiment, the DC motor control circuit can be an H-bridge circuit. It is easy for those skilled in the art to understand that the DC motor control circuit can also be implemented by other types of control circuits, and is not limited to the H-bridge circuit.

[0036] In the context of the present invention, unless otherwise specified, the term "connection" may include direct connection or indirect connection. For example, connecting the first chip 101 to the DC motor control circuit 104 may include two situations: one is to directly connect the first chip 101 to the DC motor control circuit 104 (without other components or circuits in between); the other is to indirectly connect the first chip 101 to the DC motor control circuit 104 through other circuits (such as a protection circuit or filter circuit composed of components such as capacitors and resistors).

[0037] In the context of the present invention, each DC motor control circuit is used to control one parking brake motor, ie, corresponds to one parking brake motor. In one embodiment, one H-bridge circuit is used to control one MoC, ie, corresponds to the MoC.

[0038] Figure 2 FIG. 2 shows an automotive electronic control unit 2000 according to an embodiment of the present invention. Figure 2 As shown, the automotive electronic control unit 2000 includes a microcontroller 201 , a dedicated custom chip 202 , a finished chip 203 , a switch circuit 204 , and two DC motor control circuits 205 and 206 .

[0039] exist Figure 2 In the automotive electronic control unit 2000 shown, the microcontroller 201 is used to send signals to the dedicated custom chip 202 and the finished product chip 203. In one embodiment, when the speed of the car is 0, the microcontroller 201 sends a signal to the dedicated custom chip 202 to inform it to control the parking brake motors 207 and 208 for braking. In another embodiment, when the dedicated custom chip 202 fails, the microcontroller 201 sends a signal to the finished product chip 203 to inform it to control the parking brake motor for braking.

[0040] The switch circuit 204 is configured to connect the dedicated custom chip 202 with the two DC motor control circuits 205 and 206 and disconnect the finished product chip 203 from the two DC motor control circuits 205 and 206 when the dedicated custom chip 202 is working normally, so that the dedicated custom chip 202 controls the parking brake motors 207 and 208 corresponding to the two DC motor control circuits 205 and 206. The switch circuit 204 is also configured to disconnect the dedicated custom chip 202 from at least one DC motor control circuit and connect the finished product chip 203 to the at least one DC motor control circuit when the dedicated custom chip 202 fails, so that the finished product chip 203 controls the parking brake motor corresponding to the at least one DC motor control circuit.

[0041] According to this embodiment, since the automotive electronic control unit 2000 includes two chips for controlling the DC motor control circuit, namely the dedicated customized chip 202 and the finished product chip 203, even when the dedicated customized chip 202 fails, the finished product chip 203 can be connected to the parking brake motor corresponding to at least one DC motor control circuit by switching the switch circuit 204, thereby increasing the vehicle braking capacity and eliminating safety risks.

[0042] It should be pointed out that although Figure 2 In the illustrated embodiment, the DC motor control circuits 205 and 206 are shown to be within the automotive electronic control unit 2000. Those skilled in the art will appreciate that in other embodiments, the DC motor control circuits may be disposed outside the automotive electronic control unit.

[0043] In addition, in general, a dedicated custom chip is a chip designed and manufactured to meet the requirements of a specific user or a specific electronic system, and has the advantages of small size, light weight, and low power consumption. A finished chip is a chip sold on the market, which can be applied to various automotive systems and is dedicated to a certain purpose or function.

[0044] "Switch circuit" refers to an operating unit that uses electronic circuits to realize the on-off of a circuit. In one embodiment of the present invention, the switch circuit 204 is configured to connect the dedicated customized chip 202 with the two DC motor control circuits 205 and 206 and disconnect the finished product chip 203 from the two DC motor control circuits 205 and 206 when the dedicated customized chip 202 is working normally, and disconnect the dedicated customized chip 202 from at least one DC motor control circuit and connect the finished product chip 203 to the at least one DC motor control circuit when the dedicated customized chip 202 fails.

[0045] In one embodiment, the switch circuit 204 determines whether the dedicated custom chip 202 is in normal operation by the following method: whether the switch circuit 204 receives a high level signal from the dedicated custom chip 202 within a predetermined period. If so, the switch circuit 204 determines that the dedicated custom chip 202 is in normal operation, otherwise it is considered that the dedicated custom chip 202 is faulty. In another embodiment, the switch circuit 204 determines whether the dedicated custom chip 202 is in normal operation by the following method: whether the switch circuit 204 receives a low level signal from the dedicated custom chip 202 within a predetermined period. If so, the switch circuit 204 determines that the dedicated custom chip 202 is in normal operation, otherwise it is considered that the dedicated custom chip 202 is faulty. In yet another embodiment, the switch circuit 204 determines whether the dedicated custom chip 202 is in normal operation by the following method: whether the switch circuit 204 receives a predetermined signal from the dedicated custom chip 202, the finished chip 203 or other components within a predetermined period, and the predetermined signal has a specific format. For example, when the switch circuit 204 receives a predetermined signal from the finished chip 203 within a predetermined period, it can be determined that the dedicated customized chip 202 has failed, that is, the dedicated customized chip 202 is used by default, and the finished chip 203 is used as a backup only when it fails. Of course, those skilled in the art can also easily understand that in other embodiments, when the switch circuit 204 receives a predetermined signal from the finished chip 203 within a predetermined period, it can be determined that the dedicated customized chip 202 is working normally.

[0046] exist Figure 2In the figure, two DC motor control circuits 205 and 206 are shown as two DC motor control circuits respectively controlled by two output control signals of the switch circuit. In one embodiment, the DC motor control circuit can be an H-bridge circuit. It is easy for those skilled in the art to understand that the DC motor control circuit can also be implemented by other types of control circuits, and is not limited to the H-bridge circuit.

[0047] In the context of the present invention, unless otherwise specified, the term "connection" may include direct connection or indirect connection. For example, connecting the dedicated customized chip 202 to the DC motor control circuit 205 may include two situations: one is to directly connect the dedicated customized chip 202 to the DC motor control circuit 205 (without other components or circuits in between); the other is to indirectly connect the dedicated customized chip 202 to the DC motor control circuit 205 through other circuits (such as a protection circuit or filter circuit composed of components such as capacitors and resistors).

[0048] Figure 3 FIG. 3 shows an automotive electronic control unit 3000 according to an embodiment of the present invention. Figure 3 As shown, the automotive electronic control unit 3000 includes a microcontroller 301 , a system ASIC 302 , an automatic parking brake system ASIC (APB ASIC) 303 , an L99H01 chip 304 , a switch circuit 305 , and two H-bridge circuits 306 and 307 .

[0049] In the context of the present invention, ASIC is the abbreviation of Application Specific Integrated Circuit, which means a dedicated integrated circuit.

[0050] exist Figure 3 In the automotive electronic control unit 3000 shown, the microcontroller 301 is used to send signals to the automatic parking brake system ASIC 303 and the system ASIC 302. In one embodiment, when the speed of the vehicle is 0, the microcontroller 301 sends a signal to the automatic parking brake system ASIC 303, informing it to control the MoC 308 and 309 for braking. In another embodiment, when the automatic parking brake system ASIC 303 fails, the microcontroller 301 sends a signal to the system ASIC 302. Subsequently, the system ASIC 302 notifies the L99H01 chip 304 to control the corresponding MoC through the H-bridge circuit for braking. In another embodiment, when the system ASIC 302 determines that the automatic parking brake system ASIC 303 fails, the system ASIC 302 will actively send a signal to notify the L99H01 chip 304 to control the corresponding MoC through the H-bridge circuit for braking without the need for the microcontroller 301 to send a signal.

[0051] In one embodiment, the switch circuit 305 is configured to connect the automatic parking brake system ASIC 303 with the two H-bridge circuits 306 and 307 and disconnect the L99H01 chip 304 from the two H-bridge circuits 306 and 307 when the automatic parking brake system ASIC 303 works normally, so that the automatic parking brake system ASIC 303 controls the MoCs 308 and 309 corresponding to the two H-bridge circuits 306 and 307. The switch circuit 305 is also configured to disconnect the automatic parking brake system ASIC 303 from at least one H-bridge circuit and connect the L99H01 chip 304 to the at least one H-bridge circuit when the automatic parking brake system ASIC 303 fails, so that the L99H01 chip 304 controls the MoC corresponding to the at least one H-bridge circuit.

[0052] In another embodiment, the automatic parking brake system ASIC is configured to periodically send an enable signal to the switch circuit 305 during normal operation. The enable signal can be a predetermined signal, such as a high level signal, a square wave signal, or a low level signal. The switch circuit 305 is configured to disconnect the automatic parking brake system ASIC from at least one H-bridge circuit and connect the L99H01 chip to the at least one H-bridge circuit when the enable signal is not received within a predetermined period. The predetermined period can be set as needed, such as 1ms, 10ms, etc., which is not limited here.

[0053] In one embodiment, the switch circuit 305 is configured to connect the automatic parking brake system ASIC to the H-bridge circuits 306 and 307 and disconnect the L99H01 chip 304 from the H-bridge circuit 307 when the automatic parking brake system ASIC is working normally, so that the automatic parking brake system ASIC controls the MoCs 308 and 309 corresponding to the H-bridge circuits 306 and 307, respectively. The switch circuit 305 is also configured to disconnect the automatic parking brake system ASIC from the H-bridge circuit 307 and connect the L99H01 chip 304 to the H-bridge circuit 307 when the automatic parking brake system ASIC fails, so that the L99H01 chip 304 controls the MoC 309 corresponding to the H-bridge circuit 307.

[0054] In one embodiment, MoC 308 and 309 may be located on the left and right sides of the rear axle of the vehicle body, respectively.

[0055] In one embodiment, the microcontroller 301, the system ASIC 302 (e.g., the ESP system ASIC), and the automatic parking brake system ASIC 303 receive signals from each other at a certain period to determine whether the microcontroller 301 and the automatic parking brake system ASIC 303 are working properly. The period can be set as needed, for example, 1ms, 10ms, etc., which is not limited here. When the microcontroller 301 is found to have a fault, the automatic parking brake system ASIC 303 still keeps sending a control signal to the switch circuit 305. When the automatic parking brake system ASIC 303 is found to have a fault, the system ASIC 302 will send a specific signal to the L99H01 chip 304 to enable the L99H01 chip 304 as a backup control chip.

[0056] Since the automotive electronic control unit 3000 includes chips for controlling the H-bridge circuits 306 and 307, namely the automatic parking brake system ASIC 303 and the L99H01 chip 304, even when the automatic parking brake system ASIC 303 fails, the L99H01 chip 304 can be connected to the MoC corresponding to at least one H-bridge circuit by switching the switch circuit 305, thereby increasing the vehicle braking capability and eliminating safety risks.

[0057] Figures 4 to 6 The working principle of the automotive electronic control unit according to an embodiment of the present invention is shown. According to an embodiment of the present invention, for example, Figure 3 In the automotive electronic control unit 3000 shown in FIG. 1 , when all components are working properly, the microcontroller 301 sends a signal to the automatic parking brake system ASIC 303, informing it to control the MoC (Motor on Caliper, parking brake) 308 and 309 for braking. Subsequently, the automatic parking brake system ASIC 303 is connected to the two H-bridge circuits 306 and 307 via the switch circuit 305 to realize the control of the MoC 308 and 309, as shown in FIG. Figure 4 shown.

[0058] When the microcontroller 301 fails, Figure 5 As shown, after the microcontroller 301 is found to be inoperative or faulty, the switch circuit 305 still maintains the connection between the automatic parking brake system ASIC 303 and the two H-bridge circuits 306 and 307, so that the automatic parking brake system ASIC 303 still controls the MoC 308 and 309 via the H-bridge circuits 306 and 307 to perform braking.

[0059] When the automatic parking brake system ASIC 303 fails, Figure 6As shown, the switch circuit 305 disconnects the automatic parking brake system ASIC 303 from the two H-bridge circuits, and connects the L99H01 chip 304 to the H-bridge circuit 307. In addition, the system ASIC 302 sends a signal to notify the L99H01 chip 304, so that the L99H01 chip 304 takes over the control task of the automatic parking brake system ASIC 303, controls the MoC 309 via the H-bridge circuit 307, and realizes the braking of the vehicle.

[0060] Those skilled in the art will readily appreciate that the automotive electronic control unit 1000 , 2000 or 3000 of the aforementioned embodiments may be located in a vehicle body stabilization system.

[0061] Figure 7 The control method of the parking brake switch circuit is shown. In step S702, when the first chip works normally, the first chip is connected to the two DC motor control circuits and the second chip is disconnected from the two DC motor control circuits, so that the first chip controls the parking brake motor corresponding to the two DC motor control circuits. In step S704, when the first chip fails, the first chip is disconnected from at least one DC motor control circuit, and the second chip is connected to the at least one DC motor control circuit, so that the second chip controls the parking brake motor corresponding to the at least one DC motor control circuit.

[0062] In one embodiment, the control method may further include periodically receiving an enable signal from the first chip. In one embodiment, when the enable signal is not received within a predetermined period, the first chip is disconnected from at least one DC motor control circuit, and the second chip is connected to the at least one DC motor control circuit.

[0063] It should be noted that some of the block diagrams shown in the accompanying drawings are functional entities, which do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0064] The above examples mainly illustrate the control method of the automotive electronic control unit and the parking brake switch circuit of the present invention. Although only some of the embodiments of the present invention are described, it should be understood by those skilled in the art that the present invention can be implemented in many other forms without departing from its subject matter and scope. Therefore, the examples and embodiments shown are regarded as illustrative rather than restrictive, and the present invention may cover various modifications and substitutions without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. An automotive electronic control unit, characterized in that: The automotive electronic control unit comprises: Microcontroller; System ASIC; an automatic parking brake system ASIC connected to the microcontroller; Finished chips connected to the system ASIC; and Switching circuit, The switch circuit is configured to connect the automatic parking brake system ASIC with the two-way DC motor control circuit and disconnect the finished chip from the two-way DC motor control circuit when the automatic parking brake system ASIC is working normally, so that the automatic parking brake system ASIC controls the parking brake motor corresponding to the two-way DC motor control circuit; The switch circuit is further configured to disconnect the automatic parking brake system ASIC from the at least one DC motor control circuit when the automatic parking brake system ASIC fails, and connect the finished chip to the at least one DC motor control circuit, so that the finished chip controls the parking brake motor corresponding to the at least one DC motor control circuit; and In the event of a failure or fault in the microcontroller, the switch circuit is configured to maintain the connection between the automatic parking brake system ASIC and the two-way DC motor control circuit, so that the parking brake motor corresponding to the two-way DC motor control circuit is still controlled by the automatic parking brake system ASIC. Wherein, when the automatic parking brake system ASIC fails, the microcontroller sends a signal to the system ASIC, so that the system ASIC notifies the finished chip to control the corresponding parking brake motor for braking, or when the system ASIC determines that the automatic parking brake system ASIC fails, the system ASIC actively sends a signal to notify the finished chip to control the corresponding parking brake motor for braking without the need for the microcontroller to send a signal, Among them, the finished chip is the motor driver chip L99H01 and the DC motor control circuit is an H-bridge circuit.

2. The automotive electronic control unit according to claim 1, wherein: The automatic parking brake system ASIC is configured to periodically send an enable signal to the switch circuit during normal operation.

3. The automotive electronic control unit according to claim 2, wherein: The enable signal is a high level signal.

4. The automotive electronic control unit according to claim 2 or 3, wherein: The switch circuit is configured to disconnect the automatic parking brake system ASIC from at least one DC motor control circuit and connect the finished chip to the at least one DC motor control circuit when the enable signal is not received within a predetermined period.

5. The automotive electronic control unit according to claim 1, wherein: The switch circuit is configured to connect the automatic parking brake system ASIC with the first DC motor control circuit and the second DC motor control circuit and disconnect the finished chip from the second DC motor control circuit when the automatic parking brake system ASIC is working normally, so that the automatic parking brake system ASIC controls the first parking brake motor and the second parking brake motor corresponding to the first DC motor control circuit and the second DC motor control circuit respectively; and The switching circuit is also configured to disconnect the automatic parking brake system ASIC from the second DC motor control circuit when the automatic parking brake system ASIC fails, and connect the finished chip to the second DC motor control circuit, so that the second parking brake motor corresponding to the second DC motor control circuit is controlled by the finished chip. 6 . The automotive electronic control unit as claimed in claim 5 , wherein the first parking brake motor and the second parking brake motor are respectively located on the left and right sides of the rear axle of the vehicle body.

7. The automotive electronic control unit according to claim 1, wherein: The parking brake motor is an integrated electronic parking brake motor.

8. A vehicle body stabilization system, comprising the automotive electronic control unit according to any one of claims 1 to 7.

9. An automobile, comprising the vehicle body stabilization system according to claim 8.

10. A method for controlling a parking brake system, characterized in that: The method comprises: When the automatic parking brake system ASIC is working normally, the automatic parking brake system ASIC is connected to the two-way DC motor control circuit and the connection between the finished chip and the two-way DC motor control circuit is disconnected, so that the automatic parking brake system ASIC controls the parking brake motor corresponding to the two-way DC motor control circuit; and When the automatic parking brake system ASIC fails, disconnecting the automatic parking brake system ASIC from at least one DC motor control circuit, and connecting the finished chip to the at least one DC motor control circuit, so that the finished chip controls the parking brake motor corresponding to the at least one DC motor control circuit; and In the event that the microcontroller connected to the automatic parking brake system ASIC fails or malfunctions, the connection between the automatic parking brake system ASIC and the two-way DC motor control circuit is maintained, so that the parking brake motor corresponding to the two-way DC motor control circuit is still controlled by the automatic parking brake system ASIC. Wherein, when the automatic parking brake system ASIC fails, the microcontroller sends a signal to the system ASIC connected to the finished chip, so that the system ASIC notifies the finished chip to control the corresponding parking brake motor for braking, or when the system ASIC determines that the automatic parking brake system ASIC fails, the system ASIC actively sends a signal to notify the finished chip to control the corresponding parking brake motor for braking without the need for the microcontroller to send a signal, wherein the finished chip is a motor driver chip L99H01 and the DC motor control circuit is an H-bridge circuit.

11. A computer storage medium, characterized in that: The medium includes instructions, and the instructions, when executed, execute the control method of the parking brake system according to claim 10 .

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