Dual-control EPB system of vehicle and fault monitoring method of dual-control EPB system

Abstract

The invention discloses a double-control EPB system of a vehicle and a fault monitoring method thereof, and the system comprises a main MCU and an auxiliary MCU which are connected with an EPB button of the vehicle and can control a left EPB loop and a right EPB loop in the double-control EPB system according to instructions from the EPB button; the left EPB change-over switch and the right EPB change-over switch are respectively connected with the main MCU and the auxiliary MCU through electrical circuits and switch driving control of a left EPB loop and a right EPB loop according to an EPB instruction from the main MCU or the auxiliary MCU; the main MCU comprises a main path fault monitoring part used for monitoring faults of the main EPB driving loop, the auxiliary MCU comprises an auxiliary path fault monitoring part used for monitoring faults of the auxiliary EPB driving loop, the main path fault monitoring part and the auxiliary path fault monitoring part periodically read the state of the EPB button in the operation period of the double-control EPB system, and when the EPB button is not pressed down, the main path fault monitoring part and the auxiliary path fault monitoring part are started, and when the EPB button is pressed down, the main path fault monitoring part and the auxiliary path fault monitoring part are started. On-off detection of the main / auxiliary EPB driving loop is performed in a mutually staggered manner. According to the invention, the fault that the double-control EPB change-over switch is accidentally switched from the main circuit to the auxiliary circuit can be detected.

Description

Technical Field

[0001] The present invention relates to the field of parking control of a vehicle braking control system, and in particular to a dual-control EPB system of a vehicle and a fault monitoring method thereof. Background Art

[0002] Traditional large manufacturers' vehicle braking system EPB (Electronic Parking Brake) solutions, such as Figure 3 As shown, the left and right EPB calipers are controlled by two MCUs (Micro Controller Units). When the left or right EPB caliper fails, the remaining EPB caliper assumes the function of EPB. The left and right EPB drives are controlled by separate ECUs, which is simple and clear.

[0003] This type of solution is relatively simple, but its disadvantages are also obvious. When any one of MCU1 and MCU2 fails, the left and right EPB calipers will not be able to work at the same time, and only one EPB caliper will be left to perform the parking function.

[0004] With the development of technology, the dual-control EPB solution of the vehicle's braking system has been proposed, such as Figure 4 As shown, the left and right EPB calipers can be controlled by the main MCU at the same time, and can also be controlled by the auxiliary MCU at the same time. When the main MCU fails, the auxiliary MCU can continue to control the left and right EPB calipers to maximize the function.

[0005] The above dual-control EPB solution is as follows Figure 4 As shown, an EPB switching switch is introduced. Through the EPB switching switch, the main and auxiliary MCUs can control the left and right EPB calipers respectively at the same time, but it also causes the following new problems.

[0006] The internal structure of the EPB switch is as follows: Figure 5 As shown, after the SEL pin receives the instruction, the switches D1 to D4 are switched up / down. However, when the SEL pin fails, the EPB switch may malfunction, switching from the main road to the auxiliary road, causing the main road to be unable to perform EPB control, resulting in safety risks.

[0007] The following scenario is used to illustrate: if the driver does not press the EPB button, the EPB switching switch fails and switches from the main road to the auxiliary road, causing the EPB drive and EPB actuator at the rear end of the EPB switching switch to switch from the main road to the auxiliary road; then, if the driver requires the EPB function and presses the EPB button, the main road will send a control command but will be unable to control the EPB operation, which will lead to safety risks. Summary of the invention

[0008] In view of this, the present application proposes a dual-control EPB system of a vehicle and a fault monitoring method thereof, aiming to solve the above technical problems.

[0009] In order to achieve the above-mentioned purpose, the technical solution of this application is implemented in the following way.

[0010] According to one aspect of the present application, a dual-control EPB system of a vehicle is provided, which includes: a main MCU, which is connected to the EPB button of the vehicle and can control the left and right EPB circuits in the dual-control EPB system according to instructions from the EPB button; an auxiliary MCU, which is connected to the EPB button of the vehicle and can control the left and right EPB circuits in the dual-control EPB system according to instructions from the EPB button; a left EPB switching switch, which is connected to the main MCU and the auxiliary MCU through electrical circuits, respectively, and switches the drive control of the left EPB circuit according to the EPB instructions from the main MCU or the auxiliary MCU; a right EPB switching switch, which is connected to the main MCU and the auxiliary MCU through electrical circuits, respectively, and switches the drive control of the left EPB circuit according to the EPB instructions from the main MCU or the auxiliary MCU; and a right EPB switching switch, which is connected to the main MCU and the auxiliary MCU through electrical circuits. The main MCU is connected to the auxiliary MCU, and the auxiliary MCU switches the drive control of the right EPB circuit according to the EPB instruction from the main MCU or the auxiliary MCU. The main MCU includes a main fault monitoring unit for monitoring the fault of the main EPB drive circuit, and the auxiliary MCU includes an auxiliary fault monitoring unit for monitoring the fault of the auxiliary EPB drive circuit. The main fault monitoring unit and the auxiliary fault monitoring unit periodically read the status of the EPB button during the operation of the dual-control EPB system of the vehicle to determine whether the driver has the need to pull up / release the EPB. When the EPB button is not pressed, the on / off detection of the main / auxiliary EPB drive circuits is performed at staggered times.

[0011] In the above scheme, the on-off detection of the main / auxiliary EPB drive circuit includes: the main / auxiliary MCU sends an EPB test current to the left EPB switching switch and the right EPB switching switch, and the test current is less than the EPB working current of the dual-control EPB system; the main / auxiliary MCU respectively collects the left and right EPB actual currents of the left and right EPB actuators of the dual-control EPB system, and transmits them to the main / auxiliary road fault monitoring unit; the main / auxiliary road fault monitoring unit determines the states of the collected left and right EPB actual currents to determine the on-off state of the main / auxiliary EPB drive circuit; and the main / auxiliary road fault monitoring unit performs appropriate EPB monitoring actions based on the detection results.

[0012] In the above scheme, the main / auxiliary road fault monitoring unit determines the on / off status of the main / auxiliary EPB drive circuit, including: if the collected left and right EPB actual currents are the same or similar to the test currents sent by the main / auxiliary MCU, it is determined that the main / auxiliary EPB drive circuit is turned on; if the collected left and right EPB actual currents show no current, it is determined that the main / auxiliary EPB drive circuit is disconnected; if the collected left and right EPB actual currents are much larger than the test currents sent by the main / auxiliary MCU, it is determined that the main / auxiliary EPB drive circuit has an unexpected operating fault.

[0013] In the above scheme, the main / auxiliary road fault monitoring unit performs appropriate EPB monitoring actions based on the detection results, including: the main / auxiliary MCUs exchange detection results with each other through communication lines; based on the detection results obtained by interaction, if it is determined that the main EPB drive circuit is turned on, it is determined that the main MCU performs EPB control; based on the detection results obtained by interaction, if it is determined that the auxiliary EPB drive circuit is turned on, the main MCU will hand over the EPB control to the auxiliary MCU when the vehicle speed is low and the EPB button is pressed; based on the detection results obtained by interaction, if it is determined that the main / auxiliary EPB drive circuit fails, the main or auxiliary MCU with the drive circuit turned on will cut off the power supply to the left and right EPB actuators and enter a safe state.

[0014] In the above scheme, when it is determined that the auxiliary EPB drive circuit is turned on or the main / auxiliary EPB drive circuit fails, the driver is informed of the EPB failure through a fault light or a textual prompt.

[0015] According to another aspect of the present application, a fault monitoring method for a dual-control EPB system of a vehicle is provided, comprising: periodically reading the status of the EPB button of the vehicle during the operation of the dual-control EPB system of the vehicle to determine whether the driver has a need to pull up / release the EPB; and when the EPB button is not pressed, performing on / off detection of the main / auxiliary EPB drive circuits in the dual-control EPB system at staggered times.

[0016] In the above scheme, the step of performing on-off detection of the main / auxiliary EPB drive circuits in the dual-control EPB system at staggered times further includes: sending an EPB test current from the main / auxiliary MCU in the dual-control EPB system to the left EPB switching switch and the right EPB switching switch, and the test current is less than the EPB working current of the dual-control EPB system; respectively collecting the left and right EPB actual currents of the left and right EPB actuators of the dual-control EPB system; judging the states of the collected left and right EPB actual currents to determine the on-off state of the main / auxiliary EPB drive circuits; and the main / auxiliary MCU performing appropriate EPB monitoring actions based on the detection results.

[0017] In the above scheme, the step of determining the on / off state of the main / auxiliary EPB drive circuit further includes: if the collected actual currents of the left and right EPBs are the same or similar to the test currents sent by the main / auxiliary MCU, it is determined that the main / auxiliary EPB drive circuit is on; if the collected actual currents of the left and right EPBs show no current, it is determined that the main / auxiliary EPB drive circuit is disconnected; if the collected actual currents of the left and right EPBs are much larger than the test currents sent by the main / auxiliary MCU, it is determined that the main / auxiliary EPB drive circuit has an unexpected operating fault.

[0018] In the above scheme, the step of executing appropriate EPB monitoring actions based on the detection results further includes: the main / auxiliary MCUs exchange detection results with each other through a communication line; based on the detection results obtained by the interaction, if it is determined that the main EPB drive circuit is turned on, it is determined that the main MCU executes EPB control; based on the detection results obtained by the interaction, if it is determined that the auxiliary EPB drive circuit is turned on, the main MCU will hand over the EPB control to the auxiliary MCU when the vehicle speed is low and the EPB button is pressed; based on the detection results obtained by the interaction, if it is determined that the main / auxiliary EPB drive circuit fails, the main or auxiliary MCU with the drive circuit turned on will cut off the power supply to the left and right EPB actuators and enter a safe state.

[0019] In the above scheme, when it is determined that the auxiliary EPB drive circuit is turned on or the main / auxiliary EPB drive circuit fails, the driver is informed of the EPB failure through a fault light or a textual prompt.

[0020] According to the present invention, it is possible to detect whether the main MCU or the auxiliary MCU in the dual-control EPB system of the vehicle is currently connected to the EPB drive circuit, it is possible to detect a fault in which the dual-control EPB switching switch accidentally switches from the main road to the auxiliary road, and even if the dual-control EPB switching switch in the dual-control EPB system is switched by mistake, the driver can still control the EPB function.

[0021] Furthermore, the technical solution of the present invention can detect the fault of malfunction of the vehicle's dual-control EPB system, and can take appropriate actions after detecting the fault, such as cutting off the power supply of the EPB actuator, thereby avoiding the incident of EPB accidentally working at high speed when the driver does not press the EPB button. If such an incident occurs, the vehicle will accidentally decelerate at high speed, posing a safety hazard. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a dual-control EPB system for a vehicle according to an embodiment of the present invention;

[0023] Figure 2is an overall flow chart of a fault monitoring method of a dual-control EPB system of a vehicle according to an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the structure of the EPB solution of the vehicle braking system in the prior art;

[0025] Figure 4 A schematic diagram of the structure of a dual-control EPB solution for a vehicle braking system in the prior art;

[0026] Figure 5 The figure is a schematic diagram of the internal structure of a dual-control EPB switching switch in a dual-control EPB solution of a vehicle braking system in the prior art. DETAILED DESCRIPTION

[0027] The technical solution of the present application is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0028] The various specific technical features in the various embodiments described in the specific implementation methods can be combined in various ways without contradiction. For example, different implementation methods can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0029] The dual-control EPB system of the vehicle and the fault monitoring method thereof proposed in the present invention are intended to solve the EPB functional safety problem of the dual-control EPB solution of the vehicle braking system in the prior art. As mentioned above, if the dual-control EPB switch of the dual-control EPB solution of the prior art fails, the main MCU may not be able to control the EPB drive circuit, but the main MCU itself does not know it, resulting in the driver being unable to pull up / release the EPB caliper when pressing the EPB button.

[0030] Figure 1 FIG. 1 is a schematic diagram of the structure of the dual-control EPB system of a vehicle according to an embodiment of the present invention. Figure 1 As shown, the dual-control EPB system 100 includes: a main MCU, an auxiliary MCU, a left EPB switching switch L, a right EPB switching switch R, a left EPB driver L, a right EPB driver R, a left EPB actuator L, and a right EPB actuator R.

[0031] The main MCU is connected to the vehicle's EPB button and can control the left and right EPB circuits according to the instructions from the EPB button. The main MCU is connected to the left EPB switch L and the right EPB switch R through electrical lines, and sends EPB instructions to the left EPB switch L and the right EPB switch R. In addition, the main MCU is also connected to the left EPB actuator L and the right EPB actuator R through electrical lines, and is used to collect the actual EPB current L and R from the left EPB actuator L and the right EPB actuator R, respectively.

[0032] The auxiliary MCU is connected to the vehicle's EPB button and can control the left and right EPB circuits according to the instructions from the EPB button. The auxiliary MCU is connected to the left EPB switch L and the right EPB switch through electrical lines, and sends EPB instructions to the left EPB switch L and the right EPB switch R. In addition, the auxiliary MCU is also connected to the left EPB actuator L and the right EPB actuator R through electrical lines, and is used to collect the actual EPB current L and R from the left EPB actuator L and the right EPB actuator R, respectively.

[0033] The left EPB switching switch L is connected to the left EPB drive L through an electrical circuit, and switches the drive control of the left EPB circuit according to the EPB instruction from the main MCU or the auxiliary MCU.

[0034] The right EPB switching switch R is connected to the right EPB driver R through an electrical line, and switches the drive control of the right EPB driver R according to the EPB instruction from the main MCU or the auxiliary MCU.

[0035] The left EPB drive L is connected to the left EPB actuator L through an electrical line to drive and control the left EPB actuator L.

[0036] The right EPB drive R is connected to the right EPB actuator R through an electrical line to drive and control the right EPB actuator R.

[0037] The left EPB actuator L receives the electrical signal command from the left EPB drive L, realizes the automatic clamping and releasing functions under the driving control of the left EPB drive L, and feeds back the actual EPB current L to the main MCU or auxiliary MCU.

[0038] The right EPB actuator R receives the electrical signal command from the right EPB driver R, realizes the automatic clamping and releasing functions under the driving control of the right EPB driver R, and feeds back the actual EPB current R to the main MCU or auxiliary MCU.

[0039] The main MCU includes a main control module 1 for realizing main EPB control, and the main control module 1 includes a main fault monitoring unit 11 for monitoring faults of the main EPB drive circuit. The main control module 1 and the main fault monitoring unit 11 run on the main MCU.

[0040] The auxiliary MCU includes an auxiliary control module 2 for realizing auxiliary EPB control, and the auxiliary control module 2 includes an auxiliary fault monitoring unit 21 for monitoring the fault of the auxiliary EPB driving circuit. The auxiliary control module 2 and the auxiliary fault monitoring unit 21 run on the auxiliary MCU.

[0041] The main road fault monitoring unit 11 and the auxiliary road fault monitoring unit 21 periodically read the state of the driver's EPB button during the operation of the dual-control EPB system 100 to determine whether the driver has the need to pull up / release the EPB. When the driver presses the EPB button, the main MCU or the auxiliary MCU executes the EPB function; when the driver does not press the EPB button, the main road fault monitoring unit 11 and the auxiliary road fault monitoring unit 21 perform on-off detection of the main EPB circuit and the auxiliary EPB circuit to implement EPB fault monitoring. The specific on-off detection process is as follows.

[0042] First, the EPB test current is sent from the main / auxiliary MCU to the left and right EPB switches L and R. The test current must be less than the system's EPB operating current, otherwise it will cause the EPB action to be executed and the EPB will be pulled up / released. In addition, it should be noted that the main MCU and the auxiliary MCU cannot send the test current at the same time, and they must be tested separately at different times.

[0043] Second, the main / auxiliary MCU collects the left and right EPB actual currents L and R of the left and right EPB actuators L and R respectively, and transmits them to the main / auxiliary fault monitoring units 11 and 21. The left and right EPB actual currents L and R data collected by the main MCU are transmitted to the main fault monitoring unit 11, and the left and right EPB actual currents L and R data collected by the auxiliary MCU are transmitted to the auxiliary fault monitoring unit 21.

[0044] Third, the main / auxiliary fault monitoring units 11 and 21 respectively determine the states of the collected left and right EPB actual currents L and R to determine the on / off states of the main / auxiliary EPB circuits. Specifically, if the collected left and right EPB actual currents L and R are the same or similar to the test currents sent by the main / auxiliary MCU, it can be determined that the EPB circuit is on; otherwise, if the collected left and right EPB actual currents L and R show no current, it can be determined that the EPB drive circuit is disconnected; further, if the collected left and right EPB actual currents L and R are much larger than the test currents sent by the main / auxiliary MCU, it can be determined that the EPB drive circuit has an unexpected fault.

[0045] Fourth, the main / auxiliary road fault monitoring units 11 and 21 perform appropriate EPB monitoring actions based on the detection results. Specifically, the main / auxiliary MCUs first exchange detection results with each other through the communication line. Then, based on the detection results obtained by the interaction, if it is determined that the main road is connected, it is determined that the main MCU performs EPB control, and when the driver presses the EPB button, the main MCU performs EPB pull-up / release; if it is determined that the auxiliary road is connected, the main MCU will hand over EPB control to the auxiliary MCU when the vehicle speed is low and the driver presses the EPB button, and the driver can be informed of the EPB fault through a fault light or a text prompt; if it is determined that the EPB drive circuit fails, the main or auxiliary MCU connected by the drive circuit cuts off the power supply to the left and right EPB actuators L and R, enters a safe state, and then can inform the driver of the EPB fault through a fault light or a text prompt.

[0046] As described above, according to the dual-control EPB system of the vehicle in the embodiment of the present application, it is possible to detect whether the main MCU or the auxiliary MCU in the dual-control EPB system of the vehicle is currently connected to the EPB drive circuit, and it is possible to detect the failure of the dual-control EPB switching switch accidentally switching from the main road to the auxiliary road, and even if the dual-control EPB switching switch in the dual-control EPB system is switched by mistake, the driver can still control the EPB function.

[0047] Furthermore, the technical solution of the present invention can detect the fault of malfunction of the vehicle's dual-control EPB system, and can take appropriate actions after detecting the fault, such as cutting off the power supply to the left and right EPB actuators, thereby avoiding the incident of EPB accidentally working at high speeds without the driver pressing the EPB button. If such an incident occurs, the vehicle will accidentally decelerate at high speeds, posing a safety hazard.

[0048] Figure 2 FIG. 1 is a flow chart of a fault monitoring method for a dual-control EPB system of a vehicle according to an embodiment of the present invention. Figure 2 As shown, the method includes a main line fault monitoring branch of steps 201 to 216 and an auxiliary line fault monitoring branch of steps 301 to 316. It should be noted that although Figure 2 It is shown that the main line fault monitoring branch and the auxiliary line fault monitoring branch can be executed in parallel, but in actual implementation, the main MCU side and the auxiliary MCU side cannot send down the test current at the same time, and must be detected separately at staggered times.

[0049] Regarding the main line fault monitoring branch, the specific steps are as follows.

[0050] In steps 201 to 203, the main MCU periodically reads the state of the driver's EPB button during the operation of the dual-control EPB system 100 of the vehicle to determine whether the driver has the need to pull up / release the EPB. When it is determined in step 203 that the driver presses the EPB button, the process proceeds to step 204 to stop the on / off detection of the main EPB circuit and start executing the EPB function. On the other hand, when it is determined in step 203 that the driver does not press the EPB button, the process proceeds to step 205 to start the on / off detection of the main EPB circuit.

[0051] The continuity detection process initiated in step 205 is as follows.

[0052] First, in step 206, the main MCU sends the main circuit EPB test current to the EPB switches L and R. The test current must be smaller than the working current of the EPB, otherwise the EPB action will be executed and the EPB will be pulled up / released.

[0053] In step 207 , the EPB actual currents L and R of the EPB actuators L and R are respectively acquired.

[0054] In step 208, the state of the collected EPB actual current L, R is determined to determine the on / off state of the main EPB circuit. Specifically, if it is determined in step 208 that the collected EPB actual current L, R is the same or similar to the test current sent by the main MCU, then in step 209, it can be determined that the main EPB circuit is on; otherwise, if it is determined in step 210 that the collected EPB actual current L, R shows no current, then in step 211, it can be determined that the main EPB drive circuit is disconnected; further, if the collected EPB actual current L, R is much larger than the test current sent by the main MCU, then in step 215, it can be determined that the main EPB drive circuit has an unexpected fault.

[0055] In steps 212 to 214 and 216, the main MCU side performs appropriate EPB monitoring actions based on the detection results. Specifically, in the case of the main road being connected (step 209) and the main road being disconnected (step 211), first in step 212, the main MCU side interacts with the auxiliary MCU side through the communication line to exchange detection results. Then, in step 213, the main MCU side combines the interactive detection results with the driver's EPB demand and speed to determine the appropriate EPB monitoring action. Specifically, if it is determined that the main road is connected, in step 214, it is determined that the main MCU side executes EPB control, and when the driver presses the EPB button, the main road side executes EPB pull-up / release; if it is determined that the auxiliary road is connected, the main MCU will hand over EPB control to the auxiliary MCU side when the vehicle speed is low and the driver presses the EPB button.

[0056] On the other hand, when it is determined that the main EPB drive circuit fails in step 215, the main MCU cuts off the power supply to the EPB actuators L and R and enters a safe state in step 216. Furthermore, when such a failure occurs, the driver can be informed of the EPB failure through a fault light or a textual prompt.

[0057] Regarding the auxiliary line fault monitoring branch, the specific steps are as follows.

[0058] In steps 301 to 303, the auxiliary MCU periodically reads the state of the driver's EPB button during the operation of the dual-control EPB system 100 of the vehicle to determine whether the driver has the need to pull up / release the EPB. When it is determined in step 303 that the driver presses the EPB button, the process proceeds to step 304 to stop the on / off detection of the auxiliary EPB circuit and start executing the EPB function. On the other hand, when it is determined in step 303 that the driver does not press the EPB button, the process proceeds to step 305 to start the on / off detection of the auxiliary EPB circuit.

[0059] The continuity detection process initiated in step 305 is as follows.

[0060] First, in step 306, the auxiliary MCU sends the auxiliary EPB test current to the EPB switching switches L and R. The test current must be less than the working current of the EPB, otherwise it will cause the EPB action to be executed and the EPB will be pulled up / released. It should be noted that, as mentioned above, the main MCU side and the auxiliary MCU side cannot send the test current at the same time, and must be detected separately at different times.

[0061] In step 307 , the EPB actual currents L and R of the EPB actuators L and R are respectively acquired.

[0062] In step 308, the state of the collected EPB actual current L, R is determined to determine the on / off state of the auxiliary EPB circuit. Specifically, if it is determined in step 308 that the collected EPB actual current L, R is the same or similar to the test current sent from the auxiliary MCU side, then in step 309, it can be determined that the auxiliary EPB circuit is on; otherwise, if it is determined in step 310 that the collected EPB actual current L, R shows no current, then in step 311, it can be determined that the auxiliary EPB drive circuit is disconnected; further, if the collected EPB actual current L, R is much larger than the test current sent from the auxiliary MCU side, then in step 315, it can be determined that the auxiliary EPB drive circuit has an unexpected fault.

[0063] In steps 312 to 314 and 316, the auxiliary MCU side performs appropriate EPB monitoring actions based on the detection results. Specifically, in the case of the auxiliary road being turned on (step 309) and the auxiliary road being turned off (step 311), first in step 312, the auxiliary MCU side exchanges the detection results with the main MCU side through the communication line. Then, in step 313, the auxiliary MCU side combines the detection results obtained by the interaction with the driver's EPB demand and speed to determine the appropriate EPB monitoring action. Specifically, if it is determined that the auxiliary road is turned on, when the driver presses the EPB button, in step 314, the auxiliary MCU side takes over the EPB control handed over by the main MCU side when the vehicle speed is low and the driver presses the EPB button, and the auxiliary road side executes the EPB pull-up / release, and can inform the driver of the EPB fault through a fault light or a textual prompt.

[0064] On the other hand, when it is determined in step 315 that the auxiliary EPB drive circuit fails, the auxiliary MCU cuts off the power supply to the EPB actuators L and R and enters a safe state in step 316. Furthermore, when such a failure occurs, the driver can be informed of the EPB failure through a fault light or a textual prompt.

[0065] As described above, according to the fault monitoring method of the dual-control EPB system of the vehicle in the embodiment of the present application, it is possible to detect whether the main MCU or the auxiliary MCU in the dual-control EPB system of the vehicle is currently connected to the EPB drive circuit, and it is possible to detect the fault of the dual-control EPB switching switch accidentally switching from the main road to the auxiliary road, and even if the dual-control EPB switching switch in the dual-control EPB system is switched by mistake, the driver can still control the EPB function.

[0066] Furthermore, the technical solution of the present invention can detect the fault of malfunction of the vehicle's dual-control EPB system, and can take appropriate actions after detecting the fault, such as cutting off the power supply of the EPB actuator, thereby avoiding the incident of EPB accidentally operating at high speed without the driver pressing the EPB button.

[0067] It should be noted that the fault monitoring method of the dual-control EPB system of the vehicle provided in the above embodiment is different from the above Figure 1 The dual-control EPB system of the vehicle provided belongs to the same inventive concept, and the specific implementation process can refer to the above system embodiment, which will not be repeated here.

[0068] The above is only an embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A dual-control EPB system for a vehicle, characterized in that: include: A main MCU connected to an EPB button of the vehicle and capable of controlling the left and right EPB circuits in the dual-control EPB system according to instructions from the EPB button; an auxiliary MCU connected to an EPB button of the vehicle and capable of controlling the left and right EPB circuits in the dual-control EPB system according to instructions from the EPB button; A left EPB switching switch, which is connected to the main MCU and the auxiliary MCU through electrical lines, respectively, and switches the driving control of the left EPB circuit according to the EPB instruction from the main MCU or the auxiliary MCU; The right EPB switching switch is connected to the main MCU and the auxiliary MCU through electrical lines, and switches the drive control of the right EPB circuit according to the EPB instruction from the main MCU or the auxiliary MCU. The main MCU includes a main circuit fault monitoring unit for monitoring faults of the main EPB drive circuit, and the auxiliary MCU includes an auxiliary circuit fault monitoring unit for monitoring faults of the auxiliary EPB drive circuit. The main-road fault monitoring unit and the auxiliary-road fault monitoring unit periodically read the status of the EPB button during the operation of the dual-control EPB system of the vehicle to determine whether the driver has the need to pull up / release the EPB. When the EPB button is not pressed, the on / off detection of the main / auxiliary EPB drive circuits is performed at staggered times.

2. The dual-control EPB system for a vehicle according to claim 1, characterized in that: The on / off detection of the main / auxiliary EPB drive circuit includes: The master / slave MCU sends an EPB test current to the left EPB switch and the right EPB switch, where the test current is less than the EPB working current of the dual-control EPB system; The main / auxiliary MCU respectively collects the left and right EPB actual currents of the left and right EPB actuators of the dual-control EPB system, and transmits them to the main / auxiliary fault monitoring unit; The main / auxiliary circuit fault monitoring unit determines the state of the collected left and right EPB actual currents to determine the on / off state of the main / auxiliary EPB drive circuits; and The main / auxiliary line fault monitoring unit performs appropriate EPB monitoring actions based on the detection results.

3. The dual-control EPB system for a vehicle according to claim 2, characterized in that: The main / auxiliary circuit fault monitoring unit determines the on / off state of the main / auxiliary EPB drive circuit including: If the collected actual currents of the left and right EPBs are the same or similar to the test currents sent by the main / auxiliary MCU, it is determined that the main / auxiliary EPB drive circuit is turned on; If the collected actual current of the left and right EPBs shows no current, it is determined that the main / auxiliary EPB drive circuit is disconnected; If the collected actual current of the left and right EPBs is much greater than the test current sent by the main / auxiliary MCU, it is determined that an unexpected failure occurs in the main / auxiliary EPB drive circuit.

4. The dual-control EPB system for a vehicle according to claim 2, characterized in that: The main / auxiliary line fault monitoring unit performs appropriate EPB monitoring actions based on the detection results, including: The master / slave MCUs exchange detection results with each other via a communication line; Based on the detection result obtained by interaction, if it is determined that the main EPB drive circuit is turned on, it is determined that the main MCU performs EPB control; Based on the detection result obtained by interaction, if it is determined that the auxiliary EPB drive circuit is turned on, the main MCU hands over the EPB control to the auxiliary MCU when the vehicle speed is low and the EPB button is pressed; Based on the detection results obtained by interaction, if it is determined that the main / auxiliary EPB drive circuit fails, the main or auxiliary MCU connected by the drive circuit cuts off the power supply to the left and right EPB actuators and enters a safe state.

5. The dual-control EPB system for a vehicle according to claim 4, characterized in that: When it is determined that the auxiliary EPB drive circuit is turned on or the main / auxiliary EPB drive circuit fails, the driver is informed of the EPB failure through a fault light or a textual prompt.

6. A fault monitoring method for a dual-control EPB system of a vehicle, characterized in that: include: Periodically reading the state of the EPB button of the vehicle during operation of the dual-control EPB system of the vehicle to determine whether the driver has a need to pull up / release the EPB; as well as When the EPB button is not pressed, the on / off detection of the main / auxiliary EPB drive circuits in the dual-control EPB system is performed at staggered times.

7. The fault monitoring method of the dual-control EPB system of a vehicle according to claim 6, characterized in that: The step of performing on / off detection of the main / auxiliary EPB drive circuits in the dual-control EPB system at staggered times further includes: Sending an EPB test current from the master / slave MCU in the dual-control EPB system to the left EPB switch and the right EPB switch, wherein the test current is less than the EPB working current of the dual-control EPB system; respectively collecting left and right EPB actual currents of left and right EPB actuators of the dual-control EPB system; Determine the state of the collected actual current of the left and right EPBs to determine the on / off state of the main / auxiliary EPB drive circuits; and The master / slave MCU executes appropriate EPB monitoring actions based on the detection results.

8. The fault monitoring method of the dual-control EPB system of a vehicle according to claim 7, characterized in that: The step of determining the on / off state of the main / auxiliary EPB drive circuit further includes: If the collected actual currents of the left and right EPBs are the same or similar to the test currents sent by the main / auxiliary MCU, it is determined that the main / auxiliary EPB drive circuit is turned on; If the collected actual current of the left and right EPBs shows no current, it is determined that the main / auxiliary EPB drive circuit is disconnected; If the collected actual current of the left and right EPBs is much greater than the test current sent by the main / auxiliary MCU, it is determined that an unexpected failure occurs in the main / auxiliary EPB drive circuit.

9. The fault monitoring method of the dual-control EPB system of a vehicle according to claim 7, characterized in that: The step of performing appropriate EPB monitoring actions based on the detection results further includes: The master / slave MCUs exchange detection results with each other via a communication line; Based on the detection result obtained by interaction, if it is determined that the main EPB drive circuit is turned on, it is determined that the main MCU performs EPB control; Based on the detection result obtained by interaction, if it is determined that the auxiliary EPB drive circuit is turned on, the main MCU hands over the EPB control to the auxiliary MCU when the vehicle speed is low and the EPB button is pressed; Based on the detection results obtained by interaction, if it is determined that the main / auxiliary EPB drive circuit fails, the main or auxiliary MCU connected by the drive circuit cuts off the power supply to the left and right EPB actuators and enters a safe state.

10. The dual-control EPB system for a vehicle according to claim 9, characterized in that: When it is determined that the auxiliary EPB drive circuit is turned on or the main / auxiliary EPB drive circuit fails, the driver is informed of the EPB failure through a fault light or a textual prompt.

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