Caliper control method and device, electronic equipment and storage medium

Abstract

The invention provides a caliper control method and device, electronic equipment and a storage medium, and relates to the technical field of vehicles. The caliper control method comprises the steps that the position of a caliper piston after vehicle braking is finished is judged according to the pressure of a pressure cylinder; and when it is judged that the caliper piston is located at the abnormal position and the vehicle is in the static state, the pressure cylinder is controlled to drive the caliper piston to return to the initial position from the abnormal position. The problem that dragging torque is increased due to the fact that the caliper piston does not return after high-pressure braking can be solved, and in addition, the position of the caliper piston after vehicle braking is finished is judged according to the pressure of the pressure cylinder; the caliper piston is usually not stopped at an abnormal position after the braking of the vehicle is finished, and at the moment, the negative pressure pumping action is not needed, so that the frequency of the negative pressure pumping action can be effectively reduced, and the service life of parts such as the pressure cylinder piston is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a caliper control method, device, electronic equipment and storage medium. Background Art

[0002] The caliper is a key component in the disc brake system. When the driver steps on the brake pedal, the hydraulic oil pushes the piston in the caliper, forcing the brake pad to press against the rotating brake disc, generating friction, thereby slowing down or stopping the car. Caliper drag refers to the situation where the brake pad cannot fully return to its original position after the brake is released and still maintains contact with the brake disc, causing unnecessary friction in the brake system. Under normal circumstances, after the brake pedal is released, the piston in the caliper will retract under the elastic action of the sealing ring, and the contact between the brake pad and the brake disc should be terminated. However, in the case of caliper drag, the brake pad and brake disc continue to contact, causing drag.

[0003] Since caliper drag will cause continuous friction between the brake pad and the brake disc or brake drum, it will not only increase the vehicle's driving resistance and affect the normal vehicle range, but also affect the vehicle's acceleration performance and the life of the braking system. Currently, the caliper drag problem is usually solved by improving the active return spring sheet or increasing the deformation of the rectangular sealing ring. However, when the brake system is working under high pressure (such as emergency braking or long-term forced braking), the contact force between the brake pad and the brake disc is very large. Even after the brake is released, the brake pad may still be tightly attached to the brake disc. The elastic effect of the return spring and the sealing ring is not enough to completely overcome this contact force, resulting in the caliper drag torque problem still cannot be effectively solved. Summary of the invention

[0004] The problem solved by the present invention is how to solve the caliper drag problem after high-pressure braking.

[0005] In order to solve the above problems, the present invention provides a caliper control method, device, electronic equipment and storage medium.

[0006] In a first aspect, the present invention provides a caliper control method, comprising:

[0007] The position of the caliper piston after the vehicle braking is completed is determined according to the pressure of the booster cylinder;

[0008] When it is determined that the caliper piston is in an abnormal position and the vehicle is in a stationary state, the caliper piston is driven to return from the abnormal position to an initial position by controlling the boost cylinder.

[0009] Optionally, judging the position of the caliper piston after the vehicle braking is completed according to the pressure of the booster cylinder includes:

[0010] During the driving of the vehicle, monitoring the pressure of the boost cylinder by a brake-by-wire system of the vehicle;

[0011] When the vehicle brakes, if the pressure of the booster cylinder is greater than a preset pressure threshold, it is determined that the caliper piston is in the abnormal position after the vehicle braking is completed; if the pressure of the booster cylinder is less than or equal to the preset pressure threshold, it is determined that the caliper piston is in the initial position after the vehicle braking is completed.

[0012] Optionally, the booster cylinder includes a booster cylinder piston, a solenoid valve, a valve body and a motor, the motor is drivingly connected to the booster cylinder piston, the booster cylinder piston is used to compress brake fluid to flow through the valve body to act on the caliper piston, the solenoid valve is used to control the opening and closing of the brake fluid channel in the valve body, and the control of the booster cylinder to drive the caliper piston to return from the abnormal position to the initial position includes:

[0013] Controlling the solenoid valve to close the valve body to prevent the hydraulic pressure of the brake fluid from acting on the caliper piston;

[0014] The motor is controlled to drive the booster cylinder piston to move in a direction opposite to the braking direction, so as to drive the caliper piston to return from the abnormal position to the initial position, wherein the braking direction refers to the moving direction of the booster cylinder piston when compressing the brake fluid.

[0015] Optionally, before the step of controlling the boost cylinder to drive the caliper piston to return from the abnormal position to the initial position, the method further comprises:

[0016] When the navigation system of the vehicle recognizes a preset signal light state and / or a preset vehicle traffic jam state, activating the automatic parking function of the vehicle;

[0017] The vehicle parking brake is requested to be activated through the vehicle's brake-by-wire system to activate the vehicle's electronic parking brake system, thereby controlling the vehicle to be stationary.

[0018] Optionally, when the navigation system of the vehicle recognizes a preset signal light state and / or a preset vehicle traffic jam state, activating the automatic parking function of the vehicle includes:

[0019] When the traffic light state indicates that the prohibited passage time exceeds a first preset time and / or the estimated time that the vehicle is in a traffic jam state exceeds a second preset time, the automatic parking function of the vehicle is activated.

[0020] Optionally, before controlling the boost cylinder to drive the caliper piston to return from the abnormal position to the initial position, the caliper control method further includes:

[0021] The vehicle is controlled to be powered off when the vehicle is stationary, an electronic parking brake system of the vehicle is activated, and a brake pedal of the vehicle is not depressed.

[0022] Optionally, after the boost cylinder is controlled to drive the caliper piston to return from the abnormal position to the initial position, the caliper control method further includes:

[0023] Controlling the boost cylinder to maintain a preset pressure, wherein the preset pressure is less than or equal to the preset pressure threshold;

[0024] The pressure data of the boost cylinder stored in the brake-by-wire system of the vehicle is erased.

[0025] In a second aspect, the present invention provides a caliper control device, comprising:

[0026] The first module is used to determine the position of the caliper piston after the vehicle brakes are finished according to the pressure of the booster cylinder;

[0027] The second module is used for, when it is determined that the caliper piston is in an abnormal position and the vehicle is in a stationary state, driving the caliper piston from the abnormal position back to an initial position by controlling the boost cylinder.

[0028] In a third aspect, the present invention provides an electronic device, including a memory and a processor;

[0029] The memory is used to store computer programs;

[0030] The processor is used to implement the caliper control method as described in the first aspect when executing the computer program.

[0031] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the caliper control method as described in the first aspect is implemented.

[0032] The beneficial effect of the caliper control method of the present invention is that when it is determined that the caliper piston is in an abnormal position and the vehicle is at a standstill, the caliper piston is driven to return from the abnormal position to the initial position by controlling the boost cylinder, thereby solving the problem of the caliper piston not returning to its original position after high-pressure braking, resulting in an increase in the drag torque. Moreover, returning to its original position in a standstill can ensure driving safety and avoid loss of braking force during driving. At the same time, since the pressure in the hydraulic system is relatively stable at this time, negative pressure can be more effectively formed to ensure that the caliper piston returns quickly. In addition, the position of the caliper piston after the vehicle braking is completed is judged based on the pressure of the boost cylinder. If the pressure of the boost cylinder shows that the vehicle has not performed high-pressure braking, the caliper piston usually does not stay in the abnormal position after the vehicle braking is completed. At this time, it is usually not necessary to perform a negative pressure pumping action, which can effectively reduce the number of negative pressure pumping actions, thereby increasing the service life of components such as the boost cylinder piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flow chart of a caliper control method according to an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of a process for determining the position of a caliper piston according to an embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of a process of driving a caliper piston to move according to an embodiment of the present invention;

[0036] Figure 4 It is a schematic diagram of the pre-process of driving the caliper piston to move according to an embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of a post-process for driving the caliper piston to move according to an embodiment of the present invention;

[0038] Figure 6 A system architecture diagram of a caliper control device according to an embodiment of the present invention;

[0039] Figure 7 4 is a system architecture diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0041] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0042] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0043] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0044] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes, and are not used to limit the scope of these messages or information.

[0045] like Figure 1 As shown, a caliper control method provided by an embodiment of the present invention includes:

[0046] S100: Determine the position of the caliper piston after vehicle braking according to the pressure of the booster cylinder.

[0047] Specifically, after high-pressure braking, the caliper piston cannot return to its initial position, resulting in an increase in the drag torque. Since the pressure of the booster cylinder can determine whether high-pressure braking has occurred, the position of the caliper piston after vehicle braking is completed can be determined based on the pressure of the booster cylinder.

[0048] Among them, the booster cylinder is a hydraulic device in the braking system, which is used to amplify the force of the driver's stepping on the brake pedal and transmit it to other parts of the braking system through hydraulic oil. The hydraulic pressure is transmitted to the caliper piston, pushing the caliper piston forward. The caliper piston pushes the brake pad (or friction pad) to make it close to the brake disc (or brake disc), generating friction and achieving braking.

[0049] Among them, the caliper piston is part of the caliper, which usually includes a caliper body (fixed near the wheel, usually made of metal, providing strong structural support), brake pads (installed inside the caliper, used to contact the brake disc and slow down through friction), caliper pistons (located inside the caliper, pushed against the brake disc by hydraulic pressure), sealing rings and spring sheets (used to prevent hydraulic oil leakage and help the piston and brake pads rebound).

[0050] S200: When it is determined that the caliper piston is in an abnormal position and the vehicle is stationary, the caliper piston is driven to return from the abnormal position to an initial position by controlling the boost cylinder.

[0051] Specifically, if it is determined that the caliper piston is in an abnormal position, the booster cylinder can be controlled to drive the caliper piston from the abnormal position back to the initial position when the vehicle is stationary. For example, the booster cylinder piston actively retreats to generate negative pressure, and the caliper piston actively returns to its original position, thereby increasing the gap between the brake disc and the caliper and reducing the caliper drag torque. Some prior arts will perform a negative pressure pumping action after the vehicle is parked and dormant, but will not consider the pressure of the booster cylinder, so the number of negative pressure pumping actions will be relatively large. This embodiment first determines the position of the caliper piston after the vehicle brakes according to the pressure of the booster cylinder. If the pressure of the booster cylinder shows that the vehicle has not been braked at too high a pressure, the caliper piston will usually not stay in an abnormal position after the vehicle brakes, and it is usually not necessary to perform a negative pressure pumping action at this time. Therefore, this embodiment can effectively reduce the number of negative pressure pumping actions, thereby increasing the service life of components such as the booster cylinder piston.

[0052] Among them, the initial position refers to the position of the caliper piston when no brake pressure is applied. Usually the caliper piston retracts slightly to maintain a certain gap so that the brake pad does not contact or only slightly contacts the brake disc; the abnormal position means that after the brake is released, the caliper piston does not return to the initial position, causing the brake pad to remain in contact with the brake disc, generating continuous friction.

[0053] Among them, the solution mentioned in the background technology to reduce the drag torque of the brake caliper by improving the active return spring sheet or increasing the deformation of the rectangular sealing ring can only reduce the drag phenomenon of the caliper to a certain extent, especially in conventional light braking conditions. However, when the brake system is working under high pressure, the drag torque problem of the caliper cannot be effectively solved; for example, the active return spring sheet is used to help the brake pad rebound from the brake disc. After the brake stops, the return effect of the spring sheet can reduce the contact between the brake pad and the brake disc, thereby reducing friction and reducing the drag torque. However, the effect of this method is more obvious under lower braking pressure because the brake pad and the brake disc are closer. The pressure between the discs is smaller, and the spring sheet can pull the brake pads apart more easily; for example, rectangular sealing rings are usually used in the piston sealing parts of brake calipers, and have a certain elasticity. When the brake piston is pushed, the sealing ring is deformed. After the pressure is released, the elastic deformation of the sealing ring will help the piston rebound, thereby reducing the friction contact between the brake pads and the brake discs. By increasing the deformation of the sealing ring, the return ability of the piston can be improved to a certain extent, thereby reducing the drag torque. However, due to the very large contact force between the brake pads and the brake discs under high pressure, even after the brakes are released, the brake pads may still be tightly attached to the brake discs, and the elastic effect of the return spring and the sealing ring is not enough to completely overcome this contact force.

[0054] The impact of caliper drag on vehicle driving includes but is not limited to:

[0055] (1) Increased rolling resistance: Caliper drag will cause continuous friction between the brake pad and the brake disc or brake drum. The force generated by this friction will form resistance to the vehicle's forward direction. The vehicle needs to consume more power to overcome this additional resistance, thereby reducing fuel economy or increasing the power consumption of electric vehicles.

[0056] (2) Increased energy consumption: Due to the continuous friction of the brake system caused by caliper drag, the engine or motor needs to output more power to maintain the normal speed or acceleration of the vehicle.

[0057] (3) Temperature increase: Long-term caliper dragging will cause the temperature of the brake system to rise, especially the temperature of the brake disc and brake pads. High temperature will not only further increase friction, but may also cause premature wear of the brake system or even cause the brake system to fail. It may also affect the performance of components such as tires.

[0058] (4) Decreased acceleration and handling performance: Caliper drag affects the vehicle's acceleration performance, especially when starting or driving at high speeds, the vehicle's acceleration is significantly reduced, and the vehicle is slow to respond and lacks power. In addition, due to uneven force on the tires, it may also have a negative impact on the vehicle's handling stability, especially when turning or making emergency avoidance, which may lead to inaccurate handling or reduced braking performance.

[0059] (5) Increased wear of the brake system: Caliper drag will cause the brake pads and brake discs to wear faster. Long-term drag will not only shorten the life of the brake components, but may also lead to more serious failures and increase maintenance and replacement costs.

[0060] (6) Safety hazards: In extreme cases, severe caliper drag may cause brake failure. Continuous friction may cause the brake system to overheat, which may cause problems such as brake pad ablation and brake disc deformation, affecting brake performance and posing safety hazards.

[0061] In this embodiment, when it is determined that the caliper piston is in an abnormal position and the vehicle is at a standstill, the booster cylinder is controlled to drive the caliper piston to return from the abnormal position to the initial position, thereby solving the problem of the caliper piston not returning to its original position after high-pressure braking, resulting in an increase in the drag torque. Moreover, returning the caliper piston in a stationary state can ensure driving safety and avoid loss of braking force during driving. At the same time, since the pressure in the hydraulic system is relatively stable at this time, negative pressure can be more effectively formed to ensure that the caliper piston returns quickly. In addition, the position of the caliper piston after the vehicle braking is completed is judged based on the pressure of the booster cylinder. If the pressure of the booster cylinder shows that the vehicle has not performed high-pressure braking, the caliper piston usually does not stay in an abnormal position after the vehicle braking is completed. At this time, there is usually no need to perform negative pressure pumping, which can effectively reduce the number of negative pressure pumping actions, thereby increasing the service life of components such as the booster cylinder piston.

[0062] Optionally, judging the position of the caliper piston after the vehicle braking is completed according to the pressure of the booster cylinder includes:

[0063] S110: During the driving of the vehicle, the pressure of the boost cylinder is monitored by a brake-by-wire system of the vehicle.

[0064] Specifically, combined Figure 2 As shown, the brake-by-wire system usually has a built-in pressure sensor, which can monitor the pressure of the boost cylinder through the pressure sensor during vehicle driving.

[0065] Among them, the wire control brake system is an electronically controlled brake system. The braking process is carried out through electronic control rather than traditional hydraulic transmission. The wire control brake system reduces the friction between the brake disc and the caliper by precisely controlling the key components of the braking system (such as the valve body, boost cylinder and caliper), thereby reducing the caliper drag torque.

[0066] S120: When the vehicle brakes, if the pressure of the booster cylinder is greater than a preset pressure threshold, it is determined that the caliper piston is in the abnormal position after the vehicle brakes; if the pressure of the booster cylinder is less than or equal to the preset pressure threshold, it is determined that the caliper piston is in the initial position after the vehicle brakes.

[0067] Specifically, combined Figure 2 As shown, when the vehicle brakes, if the pressure of the booster cylinder is greater than the preset pressure threshold (for example, 7MPa), it means that the vehicle is performing high-pressure braking at this time, and the caliper piston is in an abnormal position after the vehicle brakes. If the pressure of the booster cylinder is less than or equal to the preset pressure threshold, it means that the vehicle is not performing high-pressure braking at this time, and it can be determined that the caliper piston is in the initial position.

[0068] In this optional embodiment, the pressure of the booster cylinder is monitored by the vehicle's brake-by-wire system, and the position of the caliper piston after the vehicle's braking is completed is determined based on the pressure of the booster cylinder. This can effectively reduce the number of negative pressure pumping actions and thereby increase the service life of components such as the booster cylinder piston.

[0069] Optionally, the booster cylinder includes a booster cylinder piston, a solenoid valve, a valve body and a motor, the motor is drivingly connected to the booster cylinder piston, the booster cylinder piston is used to compress brake fluid to flow through the valve body to act on the caliper piston, the solenoid valve is used to control the opening and closing of the brake fluid channel in the valve body, and the control of the booster cylinder to drive the caliper piston to return from the abnormal position to the initial position includes:

[0070] S210: Control the solenoid valve to close the valve body to prevent the hydraulic pressure of the brake fluid from acting on the caliper piston.

[0071] Specifically, combined Figure 3 As shown, the booster cylinder includes a solenoid valve and a valve body. The brake-by-wire system controls the solenoid valve to close the valve body of the booster cylinder (i.e., close the hydraulic channel) to ensure that the brake fluid does not continue to push the booster cylinder piston, thereby preventing the hydraulic pressure from acting on the caliper piston; that is, when braking force needs to be applied, the solenoid valve opens (for example, by controlling the size of the hydraulic oil flow through pulse width modulation), allowing the hydraulic oil to flow to the caliper, pushing the caliper piston to clamp the brake pad. On the contrary, when the brake is released, the solenoid valve closes to prevent the hydraulic oil from flowing and release the pressure.

[0072] Among them, the valve body is the structure for installing the solenoid valve, which usually has multiple hydraulic channels built in. It is responsible for guiding the flow of hydraulic oil. By opening and closing the solenoid valve and cooperating with system requirements, the hydraulic oil flows to different channels, thereby adjusting the brake pressure.

[0073] Among them, the wire control brake system can also realize functions such as ABS (Anti-lock Braking System), TCS (Traction Control System), VDC (Vehicle Dynamic Control) and VAF (Vehicle Acceleration Feedback System) by controlling the solenoid valve.

[0074] S220: Control the motor to drive the booster cylinder piston to move in a direction opposite to the braking direction, so as to drive the caliper piston to return from the abnormal position to the initial position, wherein the braking direction refers to the moving direction of the booster cylinder piston when compressing the brake fluid.

[0075] Specifically, combined Figure 3 As shown, the booster cylinder includes a booster cylinder piston and a motor. After the valve body is closed, the motor first pushes the booster cylinder brake fluid back to the oil pot, and then drives the booster cylinder piston back (the moving direction is opposite to the braking direction), thereby generating a negative pressure. On the one hand, it can prevent the liquid pressure from continuing to be applied to the caliper piston, and on the other hand, it can promote the return of the caliper piston, which helps to achieve pressure relief and rebound; while the booster cylinder generates negative pressure, the piston at the caliper end will also actively return (the elastic return of the sealing ring and the active return spring can be used), and the caliper piston will be pulled back to the initial position, thereby causing the brake pad to break contact with the brake disc, effectively increasing the gap between the brake pad and the brake disc.

[0076] Among them, the braking direction refers to the moving direction of the booster cylinder piston when compressing the brake fluid.

[0077] Among them, the retreat speed of the booster cylinder piston is usually in the range of 10 to 50 mm / s. In order to quickly release the brake after emergency braking, the retreat speed is preferably 30-50 mm / s, which can quickly release the brake pressure in a short time and quickly generate negative pressure.

[0078] In this optional embodiment, the caliper piston is driven back from the abnormal position to the initial position through the cooperation of the booster cylinder piston, solenoid valve, valve body and motor, thereby breaking contact between the brake pad and the brake disc, effectively increasing the gap between the brake pad and the brake disc.

[0079] Optionally, before the step of controlling the boost cylinder to drive the caliper piston to return from the abnormal position to the initial position, the method further comprises:

[0080] S201: When the navigation system of the vehicle recognizes a preset signal light state and / or a preset vehicle traffic jam state, an automatic parking function of the vehicle is activated.

[0081] Specifically, combined Figure 4 As shown, when the vehicle recognizes a preset traffic light state and / or a preset traffic jam state through the navigation system, the vehicle's automatic parking function (AVH, Auto Vehicle Hold) is activated to keep the vehicle stationary when the brake pedal is not pressed after the vehicle stops.

[0082] Among them, the automatic parking function is usually used for short-term parking to temporarily keep the vehicle stationary (for example, at a red light), and does not need to be manually turned off when starting.

[0083] S202: Requesting the vehicle parking brake to be started through the vehicle's brake-by-wire system to activate the vehicle's electronic parking brake system, thereby controlling the vehicle to be stationary.

[0084] Specifically, combined Figure 4 As shown, the vehicle parking brake is started by the wire control brake system, thereby activating the vehicle's electronic parking brake system (EPB); after the boost cylinder is controlled to drive the caliper piston back to the initial position from the abnormal position, the vehicle's automatic parking function is activated again, and the vehicle's electronic parking brake system is turned off to prepare for vehicle driving.

[0085] Among them, when the electronic parking brake system is activated (in the clamped state), the vehicle's parking brake has acted on the wheel, and the brake caliper clamps the brake disc, making the wheel unable to rotate and the vehicle remain stationary; the electronic parking brake system is usually used for long-term parking, similar to the traditional handbrake.

[0086] In this optional embodiment, the state of the vehicle is determined by the navigation system, and the corresponding parking function is activated, thereby achieving the return of the caliper piston in a stationary state.

[0087] Optionally, when the navigation system of the vehicle recognizes a preset signal light state and / or a preset vehicle traffic jam state, activating the automatic parking function of the vehicle includes:

[0088] When the traffic light state indicates that the prohibited passage time exceeds a first preset time and / or the estimated time that the vehicle is in a traffic jam state exceeds a second preset time, the automatic parking function of the vehicle is activated.

[0089] Specifically, when the vehicle identifies through the navigation system that the remaining time of the red light (no passage) exceeds a first preset duration (e.g. 30 seconds) and / or the vehicle is stuck in traffic and cannot travel for longer than a second preset duration (e.g. 2 minutes), the vehicle's automatic parking function is activated.

[0090] In this optional embodiment, the automatic parking function of the vehicle is activated according to the preset signal light state and the preset vehicle traffic jam state, thereby realizing the return of the caliper piston in a stationary state.

[0091] Optionally, before the step of controlling the boost cylinder to drive the caliper piston to return from the abnormal position to the initial position, the method further comprises:

[0092] The vehicle is controlled to be powered off when the vehicle is stationary, an electronic parking brake system of the vehicle is activated, and a brake pedal of the vehicle is not depressed.

[0093] Specifically, when the vehicle is stationary, the vehicle's electronic parking brake system is activated, which can prevent the wheels from rotating. At this time, the vehicle's brake pedal is not pressed. The driver can click the ignition switch, click to power off the entire vehicle on the large screen, or control the vehicle to power off by using the key lock button. At this time, even if the brake pedal is not pressed and the vehicle is powered off, the vehicle can still remain stationary to avoid accidental rolling, thereby safely returning the caliper piston when the vehicle is stationary.

[0094] In this optional embodiment, the boost cylinder is controlled to drive the caliper piston to return from the abnormal position to the initial position when the vehicle is powered off, thereby ensuring that the caliper piston returns to its original position in a stationary state.

[0095] Optionally, after the boost cylinder is controlled to drive the caliper piston to return from the abnormal position to the initial position, the method further includes:

[0096] S300: Control the boost cylinder to maintain a preset pressure, wherein the preset pressure is less than or equal to the preset pressure threshold.

[0097] Specifically, combined Figure 5 As shown, after the caliper piston returns to its original position, the boost cylinder is controlled to maintain a preset pressure (less than or equal to a preset pressure threshold) to prevent the vehicle from sliding down a slope.

[0098] S400: Erasing the pressure data of the boost cylinder stored in the brake-by-wire system of the vehicle.

[0099] Specifically, combined Figure 5 As shown, if the pressure data of the boost cylinder (greater than 7MPa) is stored in the wire control brake system, negative pressure will be pumped when the vehicle is stationary. Therefore, in this embodiment, after the negative pressure pumping action is performed, the stored pressure data of the boost cylinder is erased, thereby reducing unnecessary negative pressure pumping work, and the corresponding pressure data is written after the next high-pressure braking.

[0100] In this optional embodiment, after driving the caliper piston back from the abnormal position to the initial position, the boost cylinder is controlled to maintain a preset pressure to prevent the vehicle from rolling down a slope, and then the pressure data of the boost cylinder stored in the vehicle's brake-by-wire system is erased, thereby reducing unnecessary negative pressure pumping work.

[0101] like Figure 6 As shown, a caliper control device 600 provided in an embodiment of the present invention includes:

[0102] The first module 610 is used to determine the position of the caliper piston after the vehicle braking is completed according to the pressure of the booster cylinder;

[0103] The second module 620 is used for, when it is determined that the caliper piston is in an abnormal position and the vehicle is in a stationary state, controlling the boost cylinder to drive the caliper piston to return from the abnormal position to an initial position.

[0104] like Figure 7 As shown, an electronic device 700 provided by an embodiment of the present invention includes a memory 720 and a processor 710; the memory 720 is used to store a computer program; the processor 710 is used to implement the caliper control method as described above when executing the computer program.

[0105] In other words, an electronic device 700 includes a memory 720 and a processor 710 coupled to the memory 720; the memory 720 is configured to store a computer program; and the processor 710 is configured to perform the following operations when executing the computer program:

[0106] The position of the caliper piston after the vehicle braking is completed is determined according to the pressure of the booster cylinder;

[0107] When it is determined that the caliper piston is in an abnormal position and the vehicle is in a stationary state, the caliper piston is driven to return from the abnormal position to an initial position by controlling the boost cylinder.

[0108] An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the caliper control method as described above is implemented.

[0109] In other words, a non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor performs the following operations:

[0110] The position of the caliper piston after the vehicle braking is completed is determined according to the pressure of the booster cylinder;

[0111] When it is determined that the caliper piston is in an abnormal position and the vehicle is in a stationary state, the caliper piston is driven to return from the abnormal position to an initial position by controlling the boost cylinder.

[0112] An electronic device 700 that can be used as a server or client of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. The electronic device 700 is intended to represent various forms of digital electronic computer equipment, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device 700 can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples, and are not intended to limit the implementation of the present invention described herein and / or required.

[0113] The electronic device 700 includes a computing unit, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) or a computer program loaded from a storage unit into a random access memory (RAM). In the RAM, various programs and data required for the operation of the device can also be stored. The computing unit, ROM, and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0114] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc. In the present application, the unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present invention. In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0115] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A caliper control method, characterized in that: include: The position of the caliper piston after the vehicle braking is completed is determined according to the pressure of the booster cylinder; When it is determined that the caliper piston is in an abnormal position and the vehicle is in a stationary state, the caliper piston is driven to return from the abnormal position to an initial position by controlling the boost cylinder.

2. The caliper control method according to claim 1, characterized in that: The method of judging the position of the caliper piston after the vehicle braking is completed according to the pressure of the booster cylinder comprises: During the driving of the vehicle, monitoring the pressure of the boost cylinder by a brake-by-wire system of the vehicle; When the vehicle brakes, if the pressure of the booster cylinder is greater than a preset pressure threshold, it is determined that the caliper piston is in the abnormal position after the vehicle braking is completed; if the pressure of the booster cylinder is less than or equal to the preset pressure threshold, it is determined that the caliper piston is in the initial position after the vehicle braking is completed.

3. The caliper control method according to claim 1, characterized in that: The booster cylinder includes a booster cylinder piston, a solenoid valve, a valve body and a motor, wherein the motor is drivingly connected to the booster cylinder piston, the booster cylinder piston is used to compress brake fluid to flow through the valve body to act on the caliper piston, and the solenoid valve is used to control the opening and closing of the brake fluid channel in the valve body, and the control of the booster cylinder to drive the caliper piston to return from the abnormal position to the initial position includes: Controlling the solenoid valve to close the valve body to prevent the hydraulic pressure of the brake fluid from acting on the caliper piston; The motor is controlled to drive the booster cylinder piston to move in a direction opposite to the braking direction, so as to drive the caliper piston to return from the abnormal position to the initial position, wherein the braking direction refers to the moving direction of the booster cylinder piston when compressing the brake fluid.

4. The caliper control method according to claim 1, characterized in that: Before the boost cylinder is controlled to drive the caliper piston to return from the abnormal position to the initial position, the method further includes: When the navigation system of the vehicle recognizes a preset signal light state and / or a preset vehicle traffic jam state, activating the automatic parking function of the vehicle; The vehicle parking brake is requested to be activated through the vehicle's brake-by-wire system to activate the vehicle's electronic parking brake system, thereby controlling the vehicle to be stationary.

5. The caliper control method according to claim 4, characterized in that: When the navigation system of the vehicle recognizes a preset signal light state and / or a preset vehicle traffic jam state, activating the automatic parking function of the vehicle includes: When the traffic light state indicates that the prohibited passage time exceeds a first preset time and / or the estimated time that the vehicle is in a traffic jam state exceeds a second preset time, the automatic parking function of the vehicle is activated.

6. The caliper control method according to claim 1, characterized in that: Before the boost cylinder is controlled to drive the caliper piston to return from the abnormal position to the initial position, the method further includes: The vehicle is controlled to be powered off when the vehicle is stationary, an electronic parking brake system of the vehicle is activated, and a brake pedal of the vehicle is not depressed.

7. The caliper control method according to any one of claims 2 to 6, characterized in that: After the boost cylinder is controlled to drive the caliper piston to return from the abnormal position to the initial position, the method further includes: Controlling the boost cylinder to maintain a preset pressure, wherein the preset pressure is less than or equal to the preset pressure threshold; The pressure data of the boost cylinder stored in the brake-by-wire system of the vehicle is erased.

8. A caliper control device, characterized in that: include: The first module is used to determine the position of the caliper piston after the vehicle brakes are finished according to the pressure of the booster cylinder; The second module is used for, when it is determined that the caliper piston is in an abnormal position and the vehicle is in a stationary state, driving the caliper piston from the abnormal position back to an initial position by controlling the boost cylinder.

9. An electronic device, characterized in that: including memory and processor; The memory is used to store computer programs; The processor is used to implement the caliper control method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the caliper control method according to any one of claims 1 to 7 is implemented.

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