Vehicle parking control method, system and computer readable storage medium

Abstract

The application discloses a kind of vehicle parking return P control method, system and computer readable storage medium, the method includes: when driver parking hangs P, it is judged whether throttle and brake are stepped simultaneously;If not stepped simultaneously, then power domain controller still controls switching gear to P;If stepped simultaneously, then power domain controller continues to send pull up electronic parking brake request, and it is judged whether electronic parking brake response is satisfied and pull up caliper parking;If not satisfied, then power domain controller controls switching gear to N;If satisfied, then power domain controller still controls switching gear to P.The application can avoid the situation that vehicle automatically advances, retreats with gear after driver gets off under abnormal operation, and the method does not increase any cost, and can be optimized only by software logic.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy intelligent driving cars, and particularly relates to a control method and system for returning a vehicle to a P gear after parking and a computer readable storage medium. BACKGROUND

[0002] For a new energy vehicle integrated with a P gear and a parking switch, when a driver misoperates to press the accelerator pedal and the brake pedal at the same time and clicks the P gear, the vehicle cannot be shifted. Generally, the vehicle needs to monitor the parking EPB (electronic parking brake) state when shifting to the P gear, and the EPB cannot be clamped due to the pressed accelerator pedal. The gear stays in the D gear, and if the driver closes the door after getting off the vehicle, the vehicle may automatically move forward under the creep torque, causing a safety accident such as a collision.

[0003] The existing technology generally disables the D gear automatic driving function of the EPB, that is, when the EPB is pulled up, the accelerator pedal is not automatically released. This scheme can avoid the function logic of releasing the EPB by pressing the accelerator pedal, and thus the vehicle cannot pull up the EPB when the accelerator pedal and the brake pedal are pressed at the same time. However, due to the lack of the basic function of the EPB, after the EPB is pulled up in the D gear, the vehicle cannot automatically release the EPB by pressing the accelerator pedal, and the driver needs to manually release the EPB, which is inconvenient for driving.

[0004] In summary, for a new energy vehicle integrated with the EPB switch by using the gear design scheme, the P gear button replaces the EPB switch of the traditional vehicle. When the driver parks and shifts to the P gear, there are extreme conditions such as the accelerator pedal being stuck by the foot pad or the driver misoperating to press the accelerator pedal and the brake pedal at the same time. In the current general logic, the P gear button is pressed at this time, the vehicle pulls up the EPB and shifts to the P gear. However, the EPB is released at the same time when the accelerator pedal is pressed, and the driver releases the P gear button, the system judges the demand of driving off by pressing the accelerator pedal. In this case, the EPB is released, and the gear follows the EPB state, so the vehicle returns to the D gear. Once the driver gets off the vehicle at this time, the vehicle will automatically move forward under the driving of the creep torque in the D gear. SUMMARY

[0005] The present application solves the technical problem in the prior art by providing a control method and system for returning a vehicle to a P gear after parking and a computer readable storage medium.

[0006] The technical scheme adopted by the present application to solve the technical problem is as follows:

[0007] The present application provides a control method for returning a vehicle to a P gear after parking, comprising:

[0008] When the driver parks and selects P gear, it is determined whether the accelerator and the brake are pressed simultaneously; if not, the power domain controller still controls the gear shift to P gear; if so, the power domain controller continuously sends a request to pull up the electronic parking brake, and determines whether the electronic parking brake responds and pulls up the caliper parking brake; if not, the power domain controller controls the gear shift to N gear; if so, the power domain controller still controls the gear shift to P gear.

[0009] Further, the method of the present application comprises: when the accelerator and the brake are pressed simultaneously and P gear is selected, the automatic driving-off function by pressing the accelerator is disabled for the electronic parking brake.

[0010] Further, the method of the present application comprises: when the driver parks and selects P gear, the power domain controller identifies the parking request according to the hard-wired P gear switch, and sends a request to pull up the electronic parking brake to the control unit.

[0011] Further, the control unit of the present application comprises an integrated brake control system IBC and an electronic stability control system ESC.

[0012] Further, the method of the present application comprises: when the accelerator and the brake are pressed simultaneously and P gear is selected, the integrated brake control system IBC identifies the request to pull up the electronic parking brake from the power domain controller, controls the vehicle not to perform the automatic driving-off function by pressing the accelerator, and does not respond to the release caliper request.

[0013] Further, the method of the present application comprises: an electronic parking brake soft switch is provided on the vehicle screen, and when the accelerator and the brake are pressed simultaneously and P gear is selected, the electronic parking brake soft switch on the vehicle screen is clicked to control the vehicle still not to perform the automatic driving-off function by pressing the accelerator.

[0014] Further, the method of the present application comprises: when the driver parks and selects P gear, the power domain controller continuously sends a request to pull up the electronic parking brake, and the request stops until the electronic parking brake state jumps to the response is detected.

[0015] Further, the method of the present application comprises: when the electronic parking brake is abnormal and the electronic parking brake cannot jump to the response, the power domain controller monitors the tightening of the caliper on either side, controls the gear shift to P gear; when the state of the caliper on both sides cannot jump to the response, controls the gear shift to N gear.

[0016] The present application provides a vehicle parking control system back to P gear, comprising:

[0017] A memory for storing executable computer programs;

[0018] A processor for executing the executable computer programs stored in the memory to realize the above-mentioned vehicle parking control method back to P gear.

[0019] The application provides a computer readable storage medium storing a computer program for implementing the vehicle parking return P control method described above when executed by a processor.

[0020] The application has the following beneficial effects:

[0021] 1. The method of the application does not execute the automatic driving off function when the accelerator and the brake are pressed at the same time according to the P gear pull-up EPB request issued by the PDCU (power domain controller), and the vehicle continues to execute the pull-up EPB to enter the P gear. Even if abnormal operation occurs, the vehicle will not have the risk of out-of-control, and the sudden situation of automatic forward and backward movement of the vehicle after the driver gets off will be avoided.

[0022] 2. The method of the application can solve the potential risk of automatic forward and backward movement of the vehicle without increasing hardware and other costs, but only by optimizing the software logic and algorithm. BRIEF DESCRIPTION OF DRAWINGS

[0023] The application will be further described below in combination with the drawings and examples, and the drawings are as follows:

[0024] Figure 1 is a method flowchart of an embodiment of the application;

[0025] Figure 2 is the control logic of an embodiment of the application;

[0026] Figure 3 is the abnormal state control logic of an embodiment of the application;

[0027] Figure 4 is a structural schematic diagram of a terminal device of an embodiment of the application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the application clearer, the application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application and do not limit the application. In addition, the technical features involved in each embodiment of the application described below can be combined with each other as long as they do not conflict with each other.

[0029] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0030] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] Example 1

[0034] The English abbreviations involved in the embodiments of the present application include:

[0035] Electronic parking brake system-EPB

[0036] Power domain controller-PDCU

[0037] Integrated brake control system - IBC

[0038] Electronic stability control system - ESC

[0039] As Figure 1 shown, is the control method flow chart of the embodiment of the application.

[0040] The embodiment of the application provides a logic method for parking a vehicle back to a P gear, and relates to a new energy vehicle with integrated P gear and parking switches. When a driver misoperates to simultaneously step on a throttle and a brake pedal and clicks a P gear parking, the vehicle cannot be shifted. Generally, a vehicle needs to monitor a parking EPB state when the vehicle is shifted to the P gear, and the EPB cannot be clamped due to the stepped throttle. The gear is kept in a D gear, and if the driver closes a vehicle door after getting off the vehicle, a safety accident such as vehicle collision occurs due to automatic forward movement of the vehicle under a creeping torque.

[0041] The embodiment of the application provides an error-proof control logic scheme, and the control logic is taken as a control and execution unit by an EPB controller (an electronic parking brake system EPB). When a driver drives a vehicle to stop, the throttle stepping-off automatic driving function of the EPB needs to be disabled when the throttle and the brake are simultaneously stepped down and the P gear is shifted, so that the EPB cannot be released and the P gear cannot be shifted to keep the D / R gear.

[0042] In the preferred embodiment of the application, the control method for parking a vehicle back to a P gear specifically includes the following steps.

[0043] When the driver stops the vehicle and shifts the P gear, it is judged whether the throttle and the brake are simultaneously stepped down. If the throttle and the brake are not simultaneously stepped down, a power domain controller still controls the gear to be switched to the P gear. If the throttle and the brake are simultaneously stepped down, the power domain controller continuously sends an electronic parking brake pulling request, and judges whether an electronic parking brake response and a caliper parking are pulled.

[0044] If not, the power domain controller controls the gear to be switched to the N gear. If yes, the power domain controller still controls the gear to be switched to the P gear.

[0045] In the preferred embodiment of the application, the application further includes the following control logic and functions: when the throttle and the brake are simultaneously stepped down and the P gear is shifted, the throttle stepping-off automatic driving function of the electronic parking brake is disabled. When the driver stops the vehicle and shifts the P gear, the power domain controller identifies the parking request according to a hard-wired P gear switch, and sends an electronic parking brake pulling request to a control unit.

[0046] In the preferred embodiment of the present application, the control unit comprises an integrated brake control system IBC and an electronic stability control system ESC. When the accelerator and brake are pressed simultaneously and the gear is in P, the integrated brake control system IBC identifies the pull-up electronic parking brake request of the power domain controller, controls the vehicle not to perform the automatic driving off function by pressing the accelerator, and does not respond to the release caliper request.

[0047] In the preferred embodiment of the present application, an electronic parking brake soft switch is provided on the car screen. When the accelerator and brake are pressed simultaneously and the gear is in P, the electronic parking brake soft switch on the car screen is clicked to control the vehicle not to perform the automatic driving off function by pressing the accelerator.

[0048] In the preferred embodiment of the present application, when the driver parks and the gear is in P, the power domain controller continuously sends a pull-up electronic parking brake request, which stops until the electronic parking brake state jump is detected. When the electronic parking brake is abnormal and the electronic parking brake cannot jump to the response, the power domain controller monitors the tightening of the calipers on either side and controls the gear to switch to P; when the state of the calipers on both sides cannot jump to the response, the gear is controlled to switch to N.

[0049] In the preferred embodiment of the present application, the instrument gear display P letter flashes with a beeping sound, prompting the driver that the gear is not in P lock, and avoiding the vehicle driving forward or backward with D / R gear after getting off.

[0050] Embodiment 2

[0051] The embodiment of the present application provides a specific application scenario and control logic method based on embodiment 1. Specifically, it includes:

[0052] As shown in Figure 2 When the accelerator and brake are pressed simultaneously and the gear is in P, the PDCU (power domain controller) continuously sends a pull-up EPB request to the EPB, and the EPB executes the request to pull up the caliper parking. When the PDCU detects that the vehicle is parked and the gear is switched to P, it stops sending the EPB pull-up request. If the EPB fails to pull up due to failure or other reasons, the PDCU switches the gear to N to avoid the vehicle driving forward or backward with D / R gear.

[0053] When the driver normally presses the P button, the PDCU identifies the parking request according to the hard-wired P switch and sends an EPB pull-up request to the control unit IBC&ESC. When the accelerator and brake are pressed simultaneously and the gear is in P, the IBC does not execute the automatic driving off function by pressing the accelerator and does not respond to the release caliper request by identifying the EPB request signal of the PDCU. At this time, the vehicle EPB is still pulled up, and the gear returns to P.

[0054] In the preferred embodiment of the present application, when the normal driver presses the P button, the IBC&ESC redundantly executes the parking request through two signals of hard line and can line. One hard line is directly connected to the IBC controller by the P switch; the other is that the PDCU identifies the parking request of the P switch and sends the pull-up request CAN signal to the control unit IBC&ESC. When the abnormal operation (the accelerator and the brake are pressed at the same time) is parked in P, the PDCU continuously sends the parking request through CAN, and the IBC identifies the continuous EPB request signal of the PDCU, and the normal pull-up parking is no longer executed after the accelerator is pressed, so as not to release the parking caliper. At this time, the vehicle parking EPB is still pulled up, and the gear is returned to P.

[0055] In the preferred embodiment of the present application, of course, the control logic also needs the PDCU controller to work further, a: when the driver parks in P, the EPB pull-up request is sent, which stops until the EPB state jumps to apply; b: the PDCU needs to consider the gear jump logic under the abnormal condition of the EPB, that is, when the EPB state cannot return to apply, the PDCU monitors the clamping of the caliper on either side, and still can enter P. When the states of both sides cannot apply, the gear should return to N. The above strategy can ensure that the driver does not get into P when the EPB fails, and the vehicle will not automatically move forward when the driver gets off the vehicle.

[0056] In the preferred embodiment of the present application, the EPB control strategy suitable for new energy vehicles with integrated gear P includes a control scheme for preventing misoperation to ensure safe driving of the vehicle:

[0057] After the driver stops the vehicle, if the accelerator pedal is pressed by the foot pad or mispressed, the P button is pressed, and the vehicle cannot normally pull up the parking EPB. At this time, the driver gets off the vehicle, and the vehicle will automatically drive with the gear;

[0058] As shown in Figure 3 The present application provides a control logic, when the driver presses the P button, the PDCU continuously sends the pull-up EPB request to the EPB controller (IBC&ESC), and the IBC receives the pull-up request, and shields the accelerator pedal automatic driving function. This logic can effectively prevent the dangerous working condition that the accelerator pedal cannot be parked in P;

[0059] The present application changes the IBC control EPB caliper logic, and also needs the PDCU to change the P gear logic. That is, as long as one of the left and right calipers of the EPB executes pull-up apply, the gear can enter P. When both sides cannot apply, the gear returns to N.

[0060] The control logic described above needs the PDCU and IBC&ESC to change the control strategy logic to prevent the risk of automatic driving of the vehicle caused by misoperation.

[0061] Embodiment 3

[0062] The embodiment of the present application is based on embodiments 1-2, and further considers a working condition that some vehicles have an EPB soft switch on the large screen of the vehicle machine, and when the accelerator and the brake are pressed at the same time, clicking the soft switch on the large screen still cannot execute automatic driving off.

[0063] Specifically, after the IBC identifies the soft switch request can signal sent by the large screen, the automatic driving off function is not responded within 3s (which can be calibrated). This logic can effectively identify the dangerous working condition that when the accelerator and the brake are pressed at the same time, clicking the EPB soft switch on the large screen, the parking mechanism does not execute the locking and pulling up to cause the gear to be unable to enter the P gear.

[0064] Of course, this control logic also needs the PDCU controller to do further work, a: when the driver shifts the P gear, the PDCU needs to continuously send the CAN signal EPB pull-up request, and the request signal is reset to stop sending until the EPB state jump is detected as apply; b: the PDCU needs to consider the gear jump logic under the abnormal condition of the EPB, that is, when the EPB fault state cannot return to apply, the PDCU still monitors whether the left or right EPB caliper is clamped, and can enter the P gear. When the caliper state of both sides cannot apply, the gear should return to the N gear. The above strategy can ensure that in the case of EPB failure, the driver does not get off without shifting to the P gear, and the vehicle does not automatically move forward.

[0065] Embodiment 4

[0066] As shown in Figure 4 is a structural schematic diagram of a computer device provided by an embodiment of the present application, such as a smartphone, a tablet computer, a notebook computer, a desktop computer, a rack-mounted server, a blade server, a tower server, or a cabinet server (including a standalone server, or a server cluster composed of multiple servers), etc. The computer device 20 of the present embodiment at least includes but is not limited to a memory 21 and a processor 22 which can communicate and connect with each other through a system bus, as shown in Figure 4 It should be pointed out that Figure 4 only the computer device 20 with components 21-22 is shown, but it should be understood that it is not required to implement all the shown components, and more or fewer components can be alternatively implemented.

[0067] In this embodiment, the memory 21 (i.e., the readable storage medium) includes a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., an SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), and the memory 21 can also be an external storage device of the computer device 20, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the computer device 20. Of course, the memory 21 can also include both an internal storage unit and an external storage device of the computer device 20. In this embodiment, the memory 21 is generally used to store an operating system and various application software installed on the computer device 20, such as the program code of the vehicle parking back to P gear control device in the method embodiment, etc. In addition, the memory 21 can also be used to temporarily store various data that has been output or will be output.

[0068] The processor 22 can be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip in some embodiments. The processor 22 is generally used to control the overall operation of the computer device 20. In this embodiment, the processor 22 is used to run the program code or process the data stored in the memory 21, such as running the vehicle parking back to P gear control device to implement the vehicle parking back to P gear control method in the method embodiment.

[0069] Embodiment 5

[0070] The present application also provides a computer readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., an SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, a server, an App application store, etc., on which a computer program is stored, and the program is executed by the processor to implement the corresponding function. The computer readable storage medium of the present embodiment is used to store the vehicle parking back to P gear control device, and the vehicle parking back to P gear control method of the method embodiment is implemented when the processor is executed.

[0071] In summary, the present application is directed to a new energy vehicle integrated with an EPB switch using a gear design scheme. The P gear button replaces the EPB switch of a traditional vehicle. When the driver parks and engages the P gear, there are extreme conditions such as the accelerator pedal being stuck by a foot mat or the driver mistakenly operating while stepping on the accelerator and brake. In this condition, in the current general logic, the vehicle will execute the pull-up EPB and engage the P gear when the P gear button is pressed. However, the system will judge the demand for driving off with the accelerator stepped on when the pull-up EPB is recognized while the driver releases the P gear button. In this case, the EPB will be released, and the vehicle will return to the D gear due to the gear following the EPB state. Once the driver gets off at this time, the vehicle will appear out of control in the automatic forward direction under the driving of the D gear creep torque. The present application proposes a solution that, when the accelerator and brake are stepped on at the same time, the automatic driving off function is no longer executed according to the P gear pull-up EPB request issued by the PDCU, and the vehicle continues to execute the pull-up EPB and enter the P gear. It is ensured that even if abnormal operation occurs, the vehicle will not appear out of control risk.

[0072] It should be noted that, according to the needs of implementation, each step / component described in the present application can be split into more steps / components, or two or more steps / components or part of the operation of the steps / components can be combined into a new step / component, so as to realize the purpose of the present application.

[0073] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for controlling the return of a vehicle to Park (P) gear, characterized in that, include: When the driver puts the car in Park, determine whether the accelerator and brake pedals are pressed at the same time. If the pedals are not pressed simultaneously, the power domain controller will still control the shift to P gear; if the pedals are pressed simultaneously, the power domain controller will continuously send requests to engage the electronic parking brake and determine whether the electronic parking brake response is met and engage the caliper to park; if not, the power domain controller will control the shift to N gear; if so, the power domain controller will still control the shift to P gear. When the driver parks and puts the car in P gear, the power domain controller continuously sends a request to engage the electronic parking brake. This request stops when the electronic parking brake status is detected to change to a response. When the electronic parking brake malfunctions and fails to respond, the power domain controller monitors the tightening of either the left or right caliper and then controls the gear shift to P. When neither caliper responds, the gear shift is controlled to N.

2. The control method for returning a vehicle to P gear as described in claim 1, characterized in that, The method includes disabling the automatic departure function of the electronic parking brake when the accelerator and brake are pressed simultaneously and the vehicle is in Park (P) gear.

3. The control method for returning a vehicle to P gear as described in claim 1, characterized in that, The method includes: when the driver parks and shifts into Park (P) gear, the power domain controller recognizes the parking request based on the hard-wired Park (P) gear switch and sends a request to the control unit to engage the electronic parking brake.

4. The control method for returning a vehicle to P gear according to claim 3, characterized in that, The control unit includes the integrated braking control system (IBC) and the electronic stability control system (ESC).

5. The control method for returning a vehicle to P gear according to claim 4, characterized in that, The method includes: when the accelerator and brake are pressed simultaneously and the vehicle is in Park (P) gear, the Integrated Braking Control System (IBC) recognizes the request from the Power Domain Controller to engage the electronic parking brake, controls the vehicle not to perform the automatic departure function when the accelerator is pressed, and does not respond to the request to release the calipers.

6. The control method for returning a vehicle to P gear according to claim 1, characterized in that, The method includes: an electronic parking brake soft switch is set on the vehicle screen. When the accelerator and brake are pressed at the same time and the vehicle is in P gear, clicking the electronic parking brake soft switch on the vehicle screen will prevent the vehicle from automatically driving away when the accelerator is pressed.

7. A control system for returning a vehicle to P gear while it is parked, characterized in that, include: Memory, used to store executable computer programs; A processor, when executing an executable computer program stored in a memory, implements the vehicle parking return to P gear control method as described in any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that, The device contains a computer program that, when executed by a processor, implements the vehicle parking and return-to-P gear control method as described in any one of claims 1 to 6.

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