Vehicle front-rear brake pressure distribution method, device, controller and storage medium

Abstract

The application provides a vehicle front and rear brake pressure distribution method, device, controller and storage medium, and the method comprises the following steps: acquiring the stroke of a vehicle brake pedal, determining the boost parameter of a brake according to the stroke of the brake pedal; acquiring the running speed of the vehicle; if it is determined that the running speed is less than or equal to a preset running speed and the stroke of the brake pedal is less than or equal to a preset depth, then controlling the brake master cylinder solenoid valve of the vehicle to be closed; controlling the brake auxiliary master cylinder linear valve of the vehicle to be opened, so that the brake auxiliary master cylinder linear valve controls the liquid in the brake auxiliary master cylinder to enter the brake; controlling the boost solenoid valve of the left rear wheel of the vehicle and the boost solenoid valve of the right rear wheel of the vehicle to be closed; controlling the boost solenoid valve of the left front wheel of the vehicle and the boost solenoid valve of the right front wheel of the vehicle to be opened, so that the motor of the vehicle controls the brake auxiliary master cylinder to boost the left front wheel brake and the right front wheel brake of the vehicle according to the boost parameter of the brake. The application realizes effective avoidance of the howling noise of a torsion beam vehicle.

Description

Technical Field

[0001] This invention relates to the field of vehicle noise reduction technology, and in particular to a method, device, controller and storage medium for distributing pressure between the front and rear brakes of a vehicle. Background Technology

[0002] Many torsion beam vehicles on the market are prone to low-frequency moaning noise. This is because the suspension stiffness of torsion beam vehicles is relatively poor, especially the connecting plate between the torsion beam and the brake caliper, which cannot be made too stiff due to structural limitations. A typical manifestation of this is that when a torsion beam vehicle is crawling at low speed and the brake pedal is lightly applied, the rear brakes tend to produce moaning noise when moving forward or backward.

[0003] Existing technologies for mitigating whistling noise in torsion beam vehicles generally include: 1) The most common method during the development phase is to match different friction pad formulations. 2) During development, increasing the rigidity of the torsion beam and connecting plate, and improving the modal characteristics of the brake caliper bracket and connecting plate. 3) If whistling noise occurs after the brake development is completed, common methods include various chamfering of the friction pads, adding noise-reducing grease, and increasing the rigidity of the connecting plate. 4) If whistling noise occurs after the brake development is completed, changing the friction pad formulation may also be chosen to mitigate the whistling noise.

[0004] However, the inventors discovered that existing methods for avoiding whistling noise in torsion beam vehicles cannot completely eliminate whistling noise. Summary of the Invention

[0005] This invention provides a method, device, controller, and storage medium for distributing front and rear brake pressure in a vehicle. By redistributing the front and rear braking forces of the vehicle, it effectively avoids the moaning noise generated by vehicles with torsion beam structures, thereby solving the problem that existing methods for avoiding moaning noise in torsion beam vehicles cannot completely eliminate moaning noise.

[0006] In a first aspect, the present invention provides a method for distributing pressure between the front and rear brakes of a vehicle, applied to a vehicle controller, comprising:

[0007] The travel of the vehicle's brake pedal is obtained, and the pressure boosting parameters of the brake are determined based on the travel of the brake pedal; wherein, the brake includes the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake;

[0008] If the vehicle's speed is obtained, and it is determined that the vehicle's speed is less than or equal to a preset speed, and the brake pedal travel is less than or equal to a preset depth, then the vehicle's master cylinder solenoid valve is closed so that the master cylinder solenoid valve controls the fluid in the master cylinder to prevent it from entering the brake; the vehicle's secondary master cylinder linear valve is opened so that the secondary master cylinder linear valve controls the fluid in the secondary master cylinder to enter the brake.

[0009] The boost solenoid valves for the left and right rear wheels of the vehicle are closed, so that the boost solenoid valve for the left rear wheel cannot control the increase in pressure of the left rear wheel brake, and the boost solenoid valve for the right rear wheel cannot control the increase in pressure of the right rear wheel brake.

[0010] The solenoid valves controlling the boosting of the vehicle's left and right front wheels are opened, so that the vehicle's motor-controlled brake master cylinder boosts the pressure of the vehicle's left and right front wheel brakes according to the brake boosting parameters.

[0011] In one possible design, obtaining the travel of the vehicle brake pedal includes: receiving the travel of the brake pedal from a pushrod travel sensor of the vehicle, wherein the travel of the brake pedal is acquired by the pushrod travel sensor.

[0012] In one possible design, obtaining the travel of the vehicle brake pedal and determining the pressure boosting parameters of the brakes based on the travel of the brake pedal includes: obtaining the travel of the vehicle brake pedal; setting a correspondence between the travel of the brake pedal and the pressure boosting parameters of the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake; and determining the pressure boosting parameters of the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake based on the correspondence.

[0013] In one possible design, the method for distributing the pressure of the front and rear brakes of the vehicle further includes: if it is determined that the travel of the brake pedal is greater than a preset depth, then controlling the pressure boosting solenoid valves of the left rear wheel and the right rear wheel of the vehicle to open, so that the vehicle's motor-controlled sub-master cylinder boosts the pressure of the left and right rear wheel brakes of the vehicle according to the pressure boosting parameters of the brakes, until the pressure of the left and right rear wheel brakes is the same as the pressure of the left and right front wheel brakes.

[0014] In one possible design, the method for distributing the pressure of the vehicle's front and rear brakes further includes: if it is determined that the vehicle is slipping, then controlling the opening of the boost solenoid valves of the left and right rear wheels, so that the vehicle's motor-controlled sub-master cylinder boosts the pressure of the left and right rear wheel brakes according to the boost parameters of the brakes, until the pressure of the left and right rear wheel brakes is the same as the pressure of the left and right front wheel brakes.

[0015] Secondly, the present invention provides a method and apparatus for distributing pressure between the front and rear brakes of a vehicle, comprising: an acquisition module for acquiring the travel of the vehicle's brake pedal and determining brake boosting parameters based on the travel of the brake pedal; wherein the brakes include the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake; a first control module for acquiring the vehicle's driving speed, and if it is determined that the vehicle's driving speed is less than or equal to a preset driving speed and the travel of the brake pedal is less than or equal to a preset depth, then controlling the vehicle's brake master cylinder solenoid valve to close, so that the brake master cylinder solenoid valve controls the fluid in the brake master cylinder to prevent it from entering the brake; controlling the vehicle The first control module opens the linear valve of the brake master cylinder to control the fluid in the brake master cylinder to enter the brake; the second control module controls the pressure boosting solenoid valves of the left and right rear wheels to close, so that the pressure boosting solenoid valves of the left and right rear wheels cannot control the pressure increase of the left and right rear brakes; the third control module controls the pressure boosting solenoid valves of the left and right front wheels to open, so that the vehicle's motor controls the brake master cylinder to boost the pressure of the left and right front brakes according to the pressure boosting parameters of the brakes.

[0016] In one possible design, the acquisition module is specifically used to: receive the brake pedal travel data sent by the vehicle's pushrod travel sensor, wherein the brake pedal travel data is acquired by the pushrod travel sensor.

[0017] Thirdly, the present invention provides a vehicle controller, comprising: at least one processor and a memory; the memory storing computer-executable instructions; the at least one processor executing the computer-executable instructions stored in the memory, such that the at least one processor performs the method described in the first aspect above and various possible designs of the first aspect.

[0018] Fourthly, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the methods described in accordance with the first aspect above and various possible designs of the first aspect.

[0019] Fifthly, the present invention provides a computer program product comprising a computer program that, when executed by a processor, implements the method described in accordance with the first aspect above and various possible designs of the first aspect.

[0020] The vehicle front and rear brake pressure distribution method, device, controller, and storage medium provided in this application determine the brake boosting parameters based on the brake pedal travel by acquiring the vehicle's brake pedal travel; acquire the vehicle's driving speed, and if it is determined that the vehicle's driving speed is less than or equal to a preset driving speed and the brake pedal travel is less than or equal to a preset depth, then control the vehicle's master cylinder solenoid valve to close, so that the master cylinder solenoid valve controls the fluid in the master cylinder to prevent it from entering the brake; control the vehicle's secondary master cylinder linear valve to open, so that the secondary master cylinder linear valve controls the fluid in the secondary master cylinder to enter the brake; control the boosting solenoid valves of the vehicle's left rear wheel and right rear wheel. The valves are closed so that the boost solenoid valve for the left rear wheel cannot control the pressure increase of the left rear wheel brake, and the boost solenoid valve for the right rear wheel cannot control the pressure increase of the right rear wheel brake. The boost solenoid valves for the left and right front wheels are opened so that the vehicle's motor controls the brake master cylinder to boost the pressure of the left and right front wheel brakes according to the brake boost parameters. This achieves the goal of not boosting the pressure of the left and right rear wheel brakes, while boosting the pressure of the left and right front wheel brakes according to the boost parameters. By redistributing the braking force between the front and rear wheels, the moaning noise that occurs when lightly pressing the brake pedal during low-speed creep in vehicles with a torsion beam structure is eliminated. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the braking system provided in an embodiment of the present invention;

[0023] In the diagram, 1 - motor;

[0024] 2-Brake master cylinder;

[0025] 3-Pressure boosting solenoid valve;

[0026] 4-Pressure relief linear valve;

[0027] 5-Linear valve for the master cylinder of the brake auxiliary unit;

[0028] 6-Brake fluid reservoir;

[0029] 7-Brake pedal;

[0030] 8-Brake master cylinder solenoid valve;

[0031] 9-Push rod stroke sensor;

[0032] 10 - Left front wheel brake;

[0033] 11-Right front wheel brake;

[0034] 12-Left rear wheel brake;

[0035] 13-Right rear wheel brake;

[0036] Figure 2 A flowchart illustrating the vehicle front and rear brake pressure distribution method provided in this embodiment of the invention. Figure 1 ;

[0037] Figure 3 A flowchart illustrating the vehicle front and rear brake pressure distribution method provided in this embodiment of the invention. Figure 2 ;

[0038] Figure 4 This is a schematic diagram of the structure of a vehicle front and rear brake pressure distribution device provided in an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the structure of a vehicle controller provided in an embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Many torsion beam vehicles on the market are prone to low-frequency whistling noise, also known as moan noise. This is because the suspension stiffness of torsion beam vehicles is relatively poor, especially the connecting plate between the torsion beam and the brake caliper, whose stiffness cannot be maximized due to structural limitations. A typical manifestation is moan noise in torsion beam vehicles during low-speed crawling and light braking, whether the rear brakes are applied forward or reverse. The mechanism of moan noise is as follows: moan noise generally refers to frequencies between 200Hz and 500Hz, generated by low-frequency resonance between the suspension and braking systems. It mainly occurs at low speeds (below 10km / h), during low-deceleration braking (below 0.1g), or without braking, and in humid and low-temperature environments (such as foggy days, early morning, rainy days, or after a car wash). This noise is structurally transmitted and occurs more frequently in rear-wheel torsion beam vehicles, with a certain incidence rate. The noise disappears after the brake discs warm up during normal driving. Moan noise under non-braking conditions is mostly caused by uneven drag torque between the rear wheel brake pads and brake discs. Currently, the industry generally uses the following methods to mitigate moan noise in torsion beam brake systems, but these methods cannot completely eliminate it: 1) The most common method during the development phase is to match different friction pad formulations. Matching different formulations during development increases the development cycle, and due to limited sample size, it is not easily identified, posing a risk to project development. 2) Another method during development is to increase the rigidity of the torsion beam and connecting plate, and improve the modal characteristics of the brake caliper bracket and connecting plate. However, this method increases weight and cost and cannot completely eliminate moan noise, because moan noise is not entirely determined by rigidity or modal characteristics; many other influencing factors also play a role. 3) If moan noise appears after the brake system development is completed, common methods include various chamfering of the friction pads, adding noise-reducing grease, increasing cover, or improving the rigidity of the connecting plate. However, these methods all involve increased costs and sometimes may not eliminate moan noise. 4) If moaning noise occurs after the brake is developed, we will also choose to change the friction pad formula. However, changing the friction pad will result in huge development costs and a long development cycle.

[0042] To solve the above-mentioned technical problems, the present invention proposes the following technical solution: by controlling the opening or closing of the vehicle's brake master cylinder control solenoid valve, brake secondary master cylinder linear valve, and booster solenoid valve, the brake pressure is redistributed, thereby eliminating the vehicle's whistling noise. 。

[0043] The following detailed embodiments will be used to illustrate the point.

[0044] Figure 1 This is a schematic diagram of the braking system of a vehicle provided in an embodiment of the present invention. Figure 1As shown, 1 is the motor, 2 is the brake master cylinder, 3 is the boost solenoid valve, 4 is the pressure relief linear valve, 5 is the brake master cylinder linear valve, 6 is the brake fluid reservoir, 7 is the brake pedal, 8 is the brake master cylinder solenoid valve, 9 is the pushrod travel sensor, 10 is the left front wheel brake, 11 is the right front wheel brake, 12 is the left rear wheel brake, and 13 is the right rear wheel brake. There are 4 boost solenoid valves, 4 pressure relief linear valves, 2 brake master cylinder linear valves, and 2 brake master cylinder solenoid valves.

[0045] The braking system contains a master cylinder (the master cylinder is located in...) Figure 1 (Not shown in the diagram) and the auxiliary master cylinder, where the auxiliary master cylinder is the same as the motor master cylinder. When the brake master cylinder solenoid valve is open, the fluid in the brake master cylinder can enter the brake; when the auxiliary master cylinder linear valve is open, the fluid in the auxiliary master cylinder enters the brake. Under normal conditions, the brake master cylinder solenoid valve is open, and the auxiliary master cylinder linear valve is closed. In case of brake system failure, manual operation can be used to allow fluid from the master cylinder to enter the four brakes to generate braking. However, when the brake pedal is pressed, the brake master cylinder solenoid valve is closed, and the auxiliary master cylinder linear valve is open. Fluid from the brake master cylinder will not enter the brake, but fluid from the auxiliary master cylinder will enter the brake. The entry of fluid from the auxiliary master cylinder into the brake is controlled by the motor.

[0046] The braking system works as follows: When the user presses the brake pedal, the two master cylinder solenoid valves close, and the pressure built up by the master cylinder connected to the brake pedal is not transmitted to the brakes at the wheel ends. At this time, the two auxiliary master cylinder linear valves open, the four booster solenoid valves are normally open, and the four pressure relief linear valves are normally closed. The motor boosts the pressure of the auxiliary master cylinders, and the hydraulic pressure is boosted to the brakes of the four wheels through the booster solenoid valves. The brake calipers clamp the brake discs to generate braking torque.

[0047] Specifically, the braking system in this invention can be a onebox braking system, which integrates the power booster and the electronic stability program (ESP) into one unit to form an "integrated power brake system (IPB)".

[0048] Figure 2 A flowchart illustrating the vehicle front and rear brake pressure distribution method provided in this embodiment of the invention. Figure 1 In this embodiment, the executing entity can be a vehicle controller. The vehicle controller can implement the following methods through software, hardware, or a combination of both. This embodiment does not impose any particular limitations. For example... Figure 2 As shown, the method includes:

[0049] S201: Obtain the travel of the vehicle's brake pedal and determine the brake boosting parameters based on the travel of the brake pedal; wherein, the brakes include the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake.

[0050] In this embodiment, obtaining the travel of the vehicle brake pedal includes: receiving the travel of the brake pedal sent by the vehicle's push rod travel sensor, wherein the travel of the brake pedal is acquired by the push rod travel sensor.

[0051] Specifically, such as Figure 1 As shown, the push rod stroke sensor 9 is connected to the brake pedal 7. After the user presses the brake pedal, the push rod stroke sensor can collect the travel of the brake pedal and send the collected travel of the brake pedal to the vehicle controller.

[0052] In this embodiment, the travel of the vehicle brake pedal determines the pressure boosting method when the pressure of the front and rear brakes of the vehicle is distributed, and when the pressure of the front and rear brakes of the vehicle is boosted, the pressure boosting method can be a large pressure boosting method.

[0053] S202: Obtain the vehicle's driving speed. If it is determined that the vehicle's driving speed is less than or equal to the preset driving speed and the brake pedal travel is less than or equal to the preset depth, then control the vehicle's master cylinder solenoid valve to close so that the master cylinder solenoid valve controls the fluid in the master cylinder to prevent it from entering the brake; control the vehicle's secondary master cylinder linear valve to open so that the secondary master cylinder linear valve controls the fluid in the secondary master cylinder to enter the brake.

[0054] In this embodiment, if it is determined that the travel of the brake pedal is greater than the preset depth, the booster solenoid valves of the left and right rear wheels of the vehicle are opened, so that the motor control sub-master cylinder of the vehicle boosts the pressure of the left and right rear wheel brakes according to the brake boosting parameters until the pressure of the left and right rear wheel brakes is the same as the pressure of the left and right front wheel brakes.

[0055] Specifically, when the brake pedal is pressed for a distance greater than a certain depth, for safety reasons, the front and rear brakes are simultaneously pressurized or the pressure of the rear wheel brakes is restored.

[0056] In this embodiment, if it is determined that the vehicle is slipping, the boost solenoid valves of the left and right rear wheels are opened, so that the motor control sub-master cylinder of the vehicle boosts the pressure of the left and right rear wheel brakes according to the brake boosting parameters, until the pressure of the left and right rear wheel brakes is the same as that of the left and right front wheel brakes.

[0057] Specifically, when a vehicle rolls down a slope, considering safety factors, the pressure of the front and rear brakes should be increased simultaneously or the pressure of the rear wheel brakes should be restored.

[0058] In this embodiment, when the vehicle's speed is less than or equal to a preset speed and the brake pedal travel is less than or equal to a preset depth, the solenoid valve of the master brake cylinder is closed, preventing the fluid in the master brake cylinder from entering the brake. After the linear valve of the secondary master brake cylinder is opened, the fluid in the secondary master brake cylinder can enter the brake. The fluid in the secondary master brake cylinder can enter the brake, and the brake is pressurized by hydraulic pressure. The brake caliper clamps the brake disc to generate braking torque, thereby redistributing the pressure between the front and rear brakes. The entry of the fluid from the secondary master brake cylinder into the brake is achieved by motor control.

[0059] Specifically, the preset driving speed can be set according to the actual situation, for example, it can be set to 7 kilometers per hour, and this embodiment does not impose a specific limitation on it. The preset depth can also be set according to the situation, for example, it can be set to 30 millimeters, and this embodiment does not impose a specific limitation on it either.

[0060] S203: Control the pressure boosting solenoid valves of the left and right rear wheels of the vehicle to close, so that the pressure boosting solenoid valve of the left rear wheel cannot control the pressure increase of the left rear wheel brake, and the pressure boosting solenoid valve of the right rear wheel cannot control the pressure increase of the right rear wheel brake.

[0061] In this embodiment, the booster solenoid valve is also called the IV solenoid valve, from Figure 1 It is known that there are 4 boost solenoid valves, which control the left front wheel brake, right front wheel brake, left rear wheel brake and right rear wheel brake respectively. When the boost solenoid valve is opened, the vehicle's motor controls the brake master cylinder to boost the pressure of the brake corresponding to the boost solenoid valve.

[0062] Specifically, when the vehicle's low-speed creep speed is less than or equal to the preset driving speed, lightly pressing the brake pedal can eliminate moan noise regardless of whether the vehicle is stopped on flat ground or a slope, on a high or low surface, or moving forward or backward, as long as the anti-lock braking system is not triggered.

[0063] After the pressure boosting solenoid valves controlling the left and right rear wheels of the vehicle are closed, the fluid in the master cylinder of the brake auxiliary cannot enter the left and right rear wheel brakes. Therefore, the left and right rear wheel brakes cannot be pressurized, which results in the rear axle brakes not being pressurized. At this time, because the rear axle brakes have no pressure, no disc friction noise will be generated.

[0064] S204: Controls the opening of the boost solenoid valves for the left and right front wheels of the vehicle, so that the vehicle's motor-controlled brake master cylinder boosts the pressure of the left and right front wheel brakes according to the brake boosting parameters.

[0065] In this embodiment, after the solenoid valves controlling the pressure boosting of the left and right front wheels are opened, fluid in the master cylinder of the brake auxiliary system enters the left and right front wheel brakes. That is, the vehicle's motor controls the master cylinder of the brake auxiliary system to boost pressure on the left and right rear wheel brakes. The pressure boosting method is determined based on the pressure boosting parameters of the brakes. The pressure boosting parameters of the left and right front wheel brakes, left and right rear wheel brakes can be referred to as the Driver Brake Request (DBR) parameters.

[0066] In summary, the vehicle front and rear brake pressure distribution method provided in this embodiment obtains the travel of the vehicle's brake pedal and determines the brake boosting parameters based on the travel of the brake pedal; obtains the vehicle's driving speed, and if it is determined that the vehicle's driving speed is less than or equal to a preset driving speed and the brake pedal travel is less than or equal to a preset depth, then controls the vehicle's master cylinder solenoid valve to close, so that the master cylinder solenoid valve controls the fluid in the master cylinder to prevent it from entering the brake; controls the vehicle's secondary master cylinder linear valve to open, so that the secondary master cylinder linear valve controls the fluid in the secondary master cylinder to enter the brake; and controls the boosting solenoid valves of the vehicle's left rear wheel and right rear wheel to close. This prevents the booster solenoid valve on the left rear wheel from controlling the pressure increase of the left rear brake, and the booster solenoid valve on the right rear wheel from controlling the pressure increase of the right rear brake. It also controls the opening of the booster solenoid valves on the left and right front wheels, allowing the vehicle's motor to control the brake master cylinder to boost pressure on the left and right front brakes according to the brake booster parameters. This achieves a situation where the left and right rear brakes are not boosted, while the left and right front brakes are boosted according to the booster parameters. This redistribution of braking force eliminates the moaning noise that occurs when lightly pressing the brake pedal during low-speed crawling in a vehicle with a torsion beam structure.

[0067] Figure 3 A schematic flowchart of the brake pressure distribution method provided in the embodiments of the present invention. Figure 2 This embodiment is for Figure 2 The specific steps for obtaining the vehicle brake pedal travel and determining the brake booster parameters based on the brake pedal travel are described in the embodiment. Figure 3 As shown, the method includes:

[0068] S301: Obtain the travel of the vehicle's brake pedal.

[0069] In this embodiment, the travel of the brake pedal can be obtained by collecting the travel of the brake pedal using a push rod travel sensor, and then sending the collected travel of the brake pedal to the vehicle controller.

[0070] S302: Set the correspondence between the travel of the brake pedal and the boost parameters of the left front wheel brake, right front wheel brake, left rear wheel brake and right rear wheel brake of the vehicle.

[0071] In this embodiment, a one-to-one relationship is established between the travel of the brake pedal and the pressure boosting parameter of the brake, that is, the pressure boosting parameter of the brake is determined according to the travel of the brake pedal.

[0072] Specifically, for example, when the brake pedal travel is set to 5 mm, the pressure boosting parameter for the left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake of the vehicle can be set to 1; when the brake pedal travel is set to 6 mm, the pressure boosting parameter for the left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake of the vehicle can be set to 2. The above is only an example, and the correspondence between the brake pedal travel and the brake pressure boosting parameter can be set according to the actual situation. This embodiment does not impose specific limitations.

[0073] S303: Determine the booster parameters for the left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake of the vehicle based on the corresponding relationship.

[0074] In this embodiment, when the user presses the brake pedal, the vehicle controller obtains the travel of the brake pedal. At this time, the brake boosting parameters can be determined based on the relationship between the brake pedal travel and the brake boosting parameters.

[0075] Specifically, the brakes include the left front wheel brake, the right front wheel brake, the left rear wheel brake, and the right rear wheel brake. The correspondence between the travel of the brake pedal and each brake can be the same or different.

[0076] In summary, the vehicle front and rear brake pressure distribution method provided in this embodiment obtains the travel of the vehicle's brake pedal, sets the correspondence between the brake pedal travel and the pressure boosting parameters of the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake, and determines the pressure boosting parameters of the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake based on the correspondence. This realizes the determination of the brake boosting coefficient when redistributing the front and rear brake pressure, thereby eliminating vehicle noise in the torsion beam structure through the redistribution of the front and rear brake pressure.

[0077] Figure 4 This is a schematic diagram of the structure of a vehicle front and rear brake pressure distribution device provided in an embodiment of the present invention. Figure 4As shown, the front and rear brake pressure distribution device of the vehicle includes: an acquisition module 401, a first control module 402, a second control module 403, and a third control module 404.

[0078] The acquisition module 401 is used to acquire the travel of the vehicle's brake pedal and determine the pressure parameters of the brake based on the travel of the brake pedal; wherein the brake includes the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake and right rear wheel brake.

[0079] The first control module 402 is used to obtain the vehicle's driving speed. If it is determined that the vehicle's driving speed is less than or equal to the preset driving speed and the brake pedal travel is less than or equal to the preset depth, the control module 402 controls the vehicle's master cylinder solenoid valve to close so that the master cylinder solenoid valve controls the fluid in the master cylinder to prevent it from entering the brake. The control module 402 also controls the vehicle's secondary master cylinder linear valve to open so that the secondary master cylinder linear valve controls the fluid in the secondary master cylinder to enter the brake.

[0080] The second control module 403 is used to control the pressure boosting solenoid valves of the left rear wheel and the right rear wheel of the vehicle to close, so that the pressure boosting solenoid valve of the left rear wheel cannot control the pressure increase of the left rear wheel brake, and the pressure boosting solenoid valve of the right rear wheel cannot control the pressure increase of the right rear wheel brake.

[0081] The third control module 404 is used to control the opening of the boost solenoid valve of the left front wheel and the boost solenoid valve of the right front wheel of the vehicle, so that the motor of the vehicle controls the master cylinder of the brake auxiliary to boost the pressure of the left front wheel brake and the right front wheel brake according to the boost parameters of the brake.

[0082] In one possible implementation, the acquisition module 401 is specifically used to: receive the brake pedal travel sent by the vehicle's pushrod travel sensor, wherein the brake pedal travel is acquired by the pushrod travel sensor.

[0083] In one possible implementation, the acquisition module 401 is further specifically used to: acquire the travel of the vehicle's brake pedal; set the correspondence between the travel of the brake pedal and the boosting parameters of the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake; and determine the boosting parameters of the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake based on the correspondence.

[0084] In one possible implementation, the vehicle front and rear brake pressure distribution device further includes: a fourth control module 405, which, if it is determined that the travel of the brake pedal is greater than a preset depth, controls the opening of the pressure boosting solenoid valve of the left rear wheel and the right rear wheel, so that the vehicle's motor-controlled sub-master cylinder boosts the pressure of the left and right rear wheel brakes according to the brake boosting parameters, until the pressure of the left and right rear wheel brakes is the same as the pressure of the left and right front wheel brakes.

[0085] In one possible implementation, the vehicle front and rear brake pressure distribution device further includes: a fifth control module 406, which, if it is determined that the vehicle is slipping, controls the opening of the boost solenoid valves of the left rear wheel and the right rear wheel, so that the vehicle's motor-controlled sub-master cylinder boosts the pressure of the left and right rear wheel brakes according to the brake boosting parameters, until the pressure of the left and right rear wheel brakes is the same as the pressure of the left and right front wheel brakes.

[0086] The vehicle front and rear brake pressure distribution method device provided in this application embodiment can be used to execute the technical solution of the vehicle front and rear brake pressure distribution method in the above embodiment. Its implementation principle and technical effect are similar, and will not be repeated here.

[0087] It should be noted that the division of the various modules in the above device is merely a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, these modules can be implemented entirely in software via processing element calls; they can be fully implemented in hardware; or some modules can be implemented by processing element calls to software, while others are implemented in hardware. For example, the acquisition module 401 can be a separate processing element, or it can be integrated into a chip in the above device. Alternatively, it can be stored as program code in the memory of the above device, and its functions can be called and executed by a processing element of the device. The implementation of other modules is similar. Moreover, these modules can be fully or partially integrated together, or they can be implemented independently. The processing element here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above modules can be completed through the integrated logic circuits in the hardware of the processor element or through software instructions.

[0088] Figure 5 This is a schematic diagram of the structure of a vehicle controller provided in an embodiment of this application. Figure 5 As shown, the vehicle controller includes a transceiver 501, a processor 502, and a memory 503.

[0089] Processor 502 executes computer execution instructions stored in memory, causing processor 502 to perform the scheme in the above embodiments. Processor 502 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0090] The memory 503 is connected to the processor 502 via the system bus and completes communication between them. The memory 503 is used to store computer program instructions.

[0091] Transceiver 501 can be used to obtain the task to be run and its configuration information.

[0092] The system bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The system bus can be divided into address bus, data bus, control bus, etc. For ease of representation, only one thick line is used in the diagram, but this does not indicate that there is only one bus or one type of bus. Transceivers are used to enable communication between database access devices and other computers (e.g., clients, read-write libraries, and read-only libraries). Memory may include random access memory (RAM) and may also include non-volatile memory.

[0093] The vehicle controller provided in this application embodiment can be the terminal device described in the above embodiment.

[0094] This application also provides a chip for executing instructions, which is used to execute the technical solution of the handwritten character recognition method in the above embodiments.

[0095] This invention also provides a computer-readable storage medium storing computer-executable instructions. When a processor executes the computer-executable instructions, it implements the handwritten character recognition method described above.

[0096] This application also provides a computer program product, which includes a computer program stored in a computer-readable storage medium. At least one processor can read the computer program from the computer-readable storage medium. When the at least one processor executes the computer program, it can implement the technical solution of the handwritten character recognition method in the above embodiments.

[0097] In the several embodiments provided by this invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or modules, and may be electrical, mechanical, or other forms.

[0098] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to implement the solution of this embodiment according to actual needs.

[0099] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit. The unit composed of the above modules can be implemented in hardware or in the form of hardware plus software functional units.

[0100] The integrated modules implemented as software functional modules described above can be stored in a computer-readable storage medium. These software functional modules, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application.

[0101] The aforementioned storage medium can be implemented from any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The storage medium can be any available medium accessible to general-purpose or special-purpose computers.

[0102] An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Alternatively, the storage medium can be an integral part of the processor. Both the processor and the storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and storage medium can exist as discrete components within a vehicle controller or main control device.

[0103] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for distributing pressure between the front and rear brakes of a vehicle, characterized in that, Applied to vehicle controllers, including: The travel of the vehicle's brake pedal is obtained, and the pressure boosting parameters of the brake are determined based on the travel of the brake pedal; wherein, the brake includes the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake; If the vehicle's speed is obtained, and it is determined that the vehicle's speed is less than or equal to a preset speed, and the brake pedal travel is less than or equal to a preset depth, then the vehicle's master cylinder solenoid valve is closed so that the master cylinder solenoid valve controls the fluid in the master cylinder to prevent it from entering the brake; the vehicle's secondary master cylinder linear valve is opened so that the secondary master cylinder linear valve controls the fluid in the secondary master cylinder to enter the brake. The boost solenoid valves for the left and right rear wheels of the vehicle are closed, so that the boost solenoid valve for the left rear wheel cannot control the increase in pressure of the left rear wheel brake, and the boost solenoid valve for the right rear wheel cannot control the increase in pressure of the right rear wheel brake. The solenoid valves controlling the boosting of the vehicle's left and right front wheels are opened, so that the vehicle's motor-controlled brake master cylinder boosts the pressure of the vehicle's left and right front wheel brakes according to the brake boosting parameters.

2. The method according to claim 1, characterized in that, The process of obtaining the travel of the vehicle brake pedal includes: The device receives the brake pedal travel data sent by the vehicle's pushrod travel sensor, wherein the brake pedal travel data is acquired by the pushrod travel sensor.

3. The method according to claim 1, characterized in that, The process of obtaining the travel of the vehicle brake pedal and determining the brake booster parameters based on the travel of the brake pedal includes: Obtain the travel of the vehicle's brake pedal; The correspondence between the travel of the brake pedal and the pressure parameters of the left front wheel brake, right front wheel brake, left rear wheel brake and right rear wheel brake of the vehicle is set; The pressure boosting parameters of the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake, and right rear wheel brake are determined based on the aforementioned correspondence.

4. The method according to any one of claims 1 to 3, characterized in that, Also includes: If it is determined that the travel of the brake pedal is greater than the preset depth, the boost solenoid valves of the left and right rear wheels of the vehicle are opened, so that the vehicle's motor-controlled sub-master cylinder boosts the pressure of the left and right rear wheel brakes according to the boost parameters of the brakes, until the pressure of the left and right rear wheel brakes is the same as that of the left and right front wheel brakes.

5. The method according to any one of claims 1 to 3, characterized in that, Also includes: If it is determined that the vehicle is slipping, the boost solenoid valves of the left and right rear wheels are opened, so that the motor-controlled sub-master cylinder increases the pressure of the left and right rear wheel brakes according to the boost parameters of the brakes, until the pressure of the left and right rear wheel brakes is the same as that of the left and right front wheel brakes.

6. A method and apparatus for distributing pressure between the front and rear brakes of a vehicle, characterized in that, include: The acquisition module is used to acquire the travel of the vehicle's brake pedal and determine the pressure parameters of the brake based on the travel of the brake pedal; wherein, the brake includes the vehicle's left front wheel brake, right front wheel brake, left rear wheel brake and right rear wheel brake; The first control module is used to acquire the vehicle's driving speed. If it is determined that the vehicle's driving speed is less than or equal to a preset driving speed and the travel of the brake pedal is less than or equal to a preset depth, then the module controls the vehicle's master cylinder solenoid valve to close so that the master cylinder solenoid valve controls the fluid in the master cylinder to prevent it from entering the brake. The module also controls the vehicle's secondary master cylinder linear valve to open so that the secondary master cylinder linear valve controls the fluid in the secondary master cylinder to enter the brake. The second control module is used to control the pressure boosting solenoid valve of the left rear wheel and the pressure boosting solenoid valve of the right rear wheel of the vehicle to close, so that the pressure boosting solenoid valve of the left rear wheel cannot control the pressure increase of the left rear wheel brake, and the pressure boosting solenoid valve of the right rear wheel cannot control the pressure increase of the right rear wheel brake. The third control module is used to control the opening of the boost solenoid valves of the left front wheel and the right front wheel of the vehicle, so that the motor-controlled brake master cylinder of the vehicle can boost the pressure of the left front wheel brake and the right rear front brake according to the boost parameters of the brake.

7. The apparatus according to claim 6, characterized in that, The acquisition module is specifically used to: receive the brake pedal travel data sent by the vehicle's push rod travel sensor, wherein the brake pedal travel data is acquired by the push rod travel sensor.

8. A vehicle controller, characterized in that, include: At least one processor and memory; The memory stores computer-executed instructions; The at least one processor executes computer execution instructions stored in the memory, causing the at least one processor to perform the method as described in any one of claims 1 to 5.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1 to 5.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method of any one of claims 1 to 5.

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