A method and device for determining the amount of fluid replenishment during vehicle braking

Abstract

The embodiment of the present application discloses a method and device for determining the amount of fluid to be returned during the braking process of a vehicle. The method at least includes: determining the driving distance corresponding to the consumption of all brake fluid by the vehicle during the deceleration process of the vehicle; determining the current speed and current deceleration of the vehicle when the anti-lock braking system (ABS) of the vehicle is triggered; calculating the braking distance required for the vehicle to stop from the current speed according to the current deceleration; determining the total amount of brake fluid in the vehicle, and calculating the amount of fluid to be returned required by the vehicle according to the total amount of brake fluid, the driving distance and the braking distance. By applying the solution provided in the embodiment of the present application, the amount of brake fluid that needs to be returned can be determined according to the actual driving conditions during the braking process of the vehicle, thereby avoiding the process of returning too much brake fluid, which takes a long time. Therefore, the braking time of the vehicle can be shortened and the braking efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of motor vehicle technology, and in particular to a method and device for determining a back-off fluid replenishment amount during a vehicle braking process. Background Art

[0002] During the vehicle braking process, the wire-controlled brake assembly will press the brake fluid into the caliper to form a braking torque. When the brake fluid is completely pressed into the caliper and the vehicle has not stopped, the ABS (Anti-lock Brake System) will be triggered. After the ABS is triggered, the brake fluid will flow back to the oil tank from the pressure relief circuit.

[0003] In the known methods, after the ABS is triggered, all the brake fluid is usually controlled to flow back to the oil tank. However, in different situations, the required braking distance of the vehicle is not exactly the same, and correspondingly, the amount of brake fluid required to be returned is also different. Returning all the brake fluid may waste time, resulting in a long braking process. Therefore, how to accurately determine the amount of brake fluid returned, so as to shorten the braking distance of the vehicle, has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present application provides a method and device for determining the amount of fluid refilling during vehicle braking to accurately determine the amount of brake fluid refilling, thereby shortening the braking distance of the vehicle. The specific technical solution is as follows.

[0005] In a first aspect, an embodiment of the present application provides a method for determining a return fluid replenishment amount during a vehicle braking process, the method comprising:

[0006] During the deceleration of the vehicle, determining a travel distance corresponding to the consumption of all brake fluid by the vehicle;

[0007] When an anti-lock braking system (ABS) of the vehicle is triggered, determining a current vehicle speed and a current deceleration of the vehicle;

[0008] Calculating, based on the current deceleration, a braking distance required for the vehicle to brake from the current vehicle speed to rest;

[0009] The total amount of brake fluid of the vehicle is determined, and the amount of fluid replenishment required for the vehicle is calculated based on the total amount of brake fluid, the driving distance, and the braking distance.

[0010] Optionally, the step of calculating the amount of fluid replenishment required for the vehicle to be rolled back according to the total amount of brake fluid, the driving distance and the braking distance includes:

[0011] According to the following formula, calculate the required return fluid replenishment volume V of the vehicle x :

[0012] V x =(X1 / X)*V0

[0013] Wherein, X is the braking distance, X1 is the driving distance, and V0 is the total amount of brake fluid.

[0014] Optionally, during the deceleration of the vehicle, the step of determining the driving distance corresponding to the consumption of all brake fluid by the vehicle includes:

[0015] When the vehicle starts to decelerate, the current position of the vehicle is used as the starting position;

[0016] Check whether all the brake fluid in the oil tank has been pressed into the caliper;

[0017] When all the brake fluid in the oil tank is pressed into the caliper, the current position of the vehicle is taken as the end position;

[0018] The distance from the starting position to the ending position is calculated, and the distance is used as the driving distance corresponding to the vehicle consuming all the brake fluid.

[0019] Optionally, the step of calculating, based on the current deceleration, a braking distance required for the vehicle to stop from the current vehicle speed comprises:

[0020] The braking distance required for the vehicle to decelerate uniformly from the current vehicle speed to zero at the current deceleration is calculated.

[0021] Optionally, the method further includes:

[0022] The brake fluid controlling the return fluid replenishment amount flows back to the oil tank from the pressure relief circuit.

[0023] In a second aspect, an embodiment of the present application provides a device for determining a return fluid replenishment amount during a vehicle braking process, the device comprising:

[0024] A driving distance determination module, used to determine the driving distance corresponding to the consumption of all brake fluid by the vehicle during the deceleration of the vehicle;

[0025] A driving parameter determination module, used for determining the current speed and current deceleration of the vehicle when an anti-lock braking system (ABS) of the vehicle is triggered;

[0026] A braking distance calculation module, used for calculating the braking distance required for the vehicle to stop from the current vehicle speed according to the current deceleration;

[0027] The fluid replenishment amount calculation module is used to determine the total amount of brake fluid of the vehicle, and calculate the amount of fluid replenishment required for the vehicle to return based on the total amount of brake fluid, the driving distance and the braking distance.

[0028] Optionally, the fluid replacement volume calculation module is specifically used to:

[0029] According to the following formula, calculate the required return fluid replenishment volume V of the vehicle x :

[0030] V x =(X1 / X)*V0

[0031] Wherein, X is the braking distance, X1 is the driving distance, and V0 is the total amount of brake fluid.

[0032] Optionally, the driving distance determination module is specifically used to:

[0033] When the vehicle starts to decelerate, the current position of the vehicle is used as the starting position;

[0034] Check whether all the brake fluid in the oil tank has been pressed into the caliper;

[0035] When all the brake fluid in the oil tank is pressed into the caliper, the current position of the vehicle is taken as the end position;

[0036] The distance from the starting position to the ending position is calculated, and the distance is used as the driving distance corresponding to the vehicle consuming all the brake fluid.

[0037] Optionally, the braking distance calculation module is specifically used to:

[0038] The braking distance required for the vehicle to decelerate uniformly from the current vehicle speed to zero at the current deceleration is calculated.

[0039] Optionally, the device further comprises:

[0040] The control module is used to control the brake fluid of the return replenishment amount to flow from the pressure relief circuit back to the oil tank.

[0041] In a third aspect, an embodiment of the present application provides a computer-readable storage medium having one or more computer instructions stored thereon, which are executed by a processor to implement the method for determining the amount of back-off fluid replenishment for a vehicle braking process as described in the first aspect above.

[0042] In a fourth aspect, the present application provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the method for determining the amount of back-off fluid replenishment for a vehicle braking process as described in the first aspect above.

[0043] In an embodiment of the present application, during the vehicle braking process, the amount of brake fluid that needs to be returned can be determined based on its actual driving conditions, thereby avoiding the process of returning excessive brake fluid which takes a long time. Therefore, the vehicle braking time can be shortened and the braking efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work.

[0045] Figure 1 A schematic flow chart of a method for determining a return fluid replenishment amount during a vehicle braking process provided in an embodiment of the present application;

[0046] Figure 2 A schematic structural diagram of a device for determining the amount of fluid to be replenished during vehicle braking provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present application and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0049] The embodiment of the present application discloses a method and device for determining the amount of fluid refilling during vehicle braking, so as to accurately determine the amount of brake fluid refilling, thereby shortening the braking distance of the vehicle. The embodiment of the present application is described in detail below.

[0050] like Figure 1 As shown, it shows a flow chart of a method for determining the amount of fluid replenishment for a vehicle braking process provided by an embodiment of the present application. The method can be applied to a vehicle, specifically, to a controller in a vehicle, such as Figure 1 As shown, the process may include the following steps:

[0051] S110: During the vehicle deceleration process, determining a driving distance corresponding to consumption of all brake fluid by the vehicle.

[0052] During the vehicle braking process, the brake-by-wire assembly will press the brake fluid into the caliper to form a braking torque. When all the brake fluid is pressed into the caliper but the vehicle has not stopped, the ABS will be triggered. After the ABS is triggered, the brake fluid will flow back to the oil tank from the pressure relief circuit.

[0053] Since the total amount of brake fluid in the vehicle is limited, under normal circumstances, the vehicle needs to go through the process of brake fluid circulation, where the brake fluid is pumped into the caliper and flows back to the oil pot from the pressure relief circuit, before it can finally stop. In addition, the amount of brake fluid that is subsequently pressed into the caliper has a direct corresponding relationship with the vehicle's braking distance. Specifically, when the vehicle requires a longer braking distance, the amount of brake fluid that needs to be returned is also larger, and when the vehicle requires a shorter braking distance, the amount of brake fluid that needs to be returned is also smaller.

[0054] It can be understood that the braking time of a vehicle includes the sum of the time it takes for the brake fluid to enter the caliper and the time it takes for the brake fluid to retreat. Therefore, the amount of brake fluid retreated, that is, the time required for the brake fluid to retreat, will directly affect the braking time of the vehicle. Therefore, in the embodiment of the present application, the amount of brake fluid that needs to be retreated can be determined based on the required braking distance of the vehicle, thereby accurately controlling the time required for the brake fluid to retreat, shortening the braking distance of the vehicle, and improving the braking efficiency of the vehicle.

[0055] In the embodiment of the present application, the driving distance corresponding to the vehicle consuming all the brake fluid can be determined during the vehicle deceleration process. In other words, the distance traveled by the vehicle from the start of braking to the time when the brake fluid is completely pressed into the caliper can be determined. For example, after the vehicle starts braking, the brake fluid in the oil pot can be continuously tested. When it is detected that the remaining amount of brake fluid in the oil pot is 0, the distance traveled by the vehicle during this period is used as the driving distance corresponding to the vehicle consuming all the brake fluid.

[0056] In one implementation, the driving distance corresponding to the vehicle consuming all the brake fluid can be determined according to the following steps: when the vehicle starts to decelerate, the current position of the vehicle is used as the starting position; it is detected whether the brake fluid in the oil pot is all pressed into the caliper; when the brake fluid in the oil pot is all pressed into the caliper, the current position of the vehicle is used as the ending position; the distance from the starting position to the ending position is calculated, and the distance is used as the driving distance corresponding to the vehicle consuming all the brake fluid.

[0057] It can be understood that even for the same vehicle, when corresponding to different vehicle speeds and different road conditions, the driving distance corresponding to the vehicle consuming all the brake fluid is not exactly the same. Therefore, in the embodiment of the present application, according to the current situation of the vehicle, the driving distance corresponding to the vehicle consuming all the brake fluid is detected in real time, and the driving distance can be accurately determined, so that the brake fluid return amount can be accurately determined based on the driving distance, thereby shortening the braking distance of the vehicle.

[0058] S120: When the anti-lock braking system (ABS) of the vehicle is triggered, the current speed and the current deceleration of the vehicle are determined.

[0059] When the brake fluid is fully pressed into the caliper and the vehicle has not stopped, the ABS will be triggered. After the ABS is triggered, the brake fluid will flow back to the oil pot from the pressure relief circuit. In the embodiment of the present application, after the ABS is triggered, the current speed and current deceleration of the vehicle can be determined. For example, the current speed of the vehicle can be determined based on the speed detection device, the sensing module, etc. installed in the vehicle, and the current deceleration of the vehicle can be obtained based on the acceleration gyroscope installed in the vehicle.

[0060] S130: Calculate the braking distance required for the vehicle to stop from the current speed according to the current deceleration.

[0061] That is to say, the distance that the vehicle needs to travel from the current moment to the moment of braking can be calculated. For example, the braking distance required for the vehicle to decelerate uniformly from the current speed to zero at the current deceleration rate can be calculated. Controlling the uniform deceleration of the vehicle can control the smooth driving of the vehicle and improve the passenger comfort and riding experience.

[0062] S140: Determine the total amount of brake fluid in the vehicle, and calculate the amount of fluid replenishment required for the vehicle based on the total amount of brake fluid, the driving distance, and the braking distance.

[0063] For any vehicle, the total amount of brake fluid is a definite value, which can be obtained from its fixed parameters, or it can be obtained through real-time detection. For example, the total amount of brake fluid can be calculated by detecting the cross-sectional area of ​​the oil pot and the height of the brake fluid. Both are possible.

[0064] It can be understood that during the braking process of a vehicle, the distance traveled by the vehicle and the amount of brake fluid required are in equal proportion. Therefore, in the embodiment of the present application, the amount of fluid replenishment required for the vehicle can be calculated based on the total amount of brake fluid, the travel distance and the braking distance. Specifically, the amount of fluid replenishment required for the vehicle can be calculated according to the following formula: x :

[0065] V x =(X1 / X)*V0

[0066] Among them, X is the braking distance, X1 is the driving distance, and V0 is the total amount of brake fluid.

[0067] After calculating the amount of fluid replenishment required for the vehicle, the brake fluid of the return fluid replenishment amount can be controlled to flow back to the oil tank from the pressure relief circuit, thereby avoiding excessive return of brake fluid and shortening the vehicle's braking time.

[0068] In an embodiment of the present application, during the vehicle braking process, the amount of brake fluid that needs to be returned can be determined based on its actual driving conditions, thereby avoiding the process of returning excessive brake fluid which takes a long time. Therefore, the vehicle braking time can be shortened and the braking efficiency can be improved.

[0069] like Figure 2 As shown, it shows a structural schematic diagram of a device for determining a return fluid replenishment amount during a vehicle braking process provided by an embodiment of the present application, the device comprising:

[0070] A driving distance determination module 210, used to determine the driving distance corresponding to the consumption of all brake fluid by the vehicle during the deceleration of the vehicle;

[0071] A driving parameter determination module 220, configured to determine a current vehicle speed and a current deceleration of the vehicle when an anti-lock braking system (ABS) of the vehicle is triggered;

[0072] A braking distance calculation module 230, configured to calculate a braking distance required for the vehicle to stop from the current vehicle speed according to the current deceleration;

[0073] The fluid replenishment amount calculation module 240 is used to determine the total amount of brake fluid of the vehicle, and calculate the amount of fluid replenishment required for the vehicle to return according to the total amount of brake fluid, the driving distance and the braking distance.

[0074] Optionally, the fluid replacement amount calculation module 240 is specifically used to:

[0075] According to the following formula, calculate the required return fluid replenishment volume V of the vehicle x :

[0076] V x =(X1 / X)*V0

[0077] Wherein, X is the braking distance, X1 is the driving distance, and V0 is the total amount of brake fluid.

[0078] Optionally, the driving distance determination module 210 is specifically configured to:

[0079] When the vehicle starts to decelerate, the current position of the vehicle is used as the starting position;

[0080] Check whether all the brake fluid in the oil tank has been pressed into the caliper;

[0081] When all the brake fluid in the oil tank is pressed into the caliper, the current position of the vehicle is taken as the end position;

[0082] The distance from the starting position to the ending position is calculated, and the distance is used as the driving distance corresponding to the vehicle consuming all the brake fluid.

[0083] Optionally, the braking distance calculation module 230 is specifically used for:

[0084] The braking distance required for the vehicle to decelerate uniformly from the current vehicle speed to zero at the current deceleration is calculated.

[0085] Optionally, the device further comprises:

[0086] The control module is used to control the brake fluid of the return replenishment amount to flow from the pressure relief circuit back to the oil tank.

[0087] In an embodiment of the present application, during the vehicle braking process, the amount of brake fluid that needs to be returned can be determined based on its actual driving conditions, thereby avoiding the process of returning excessive brake fluid which takes a long time. Therefore, the vehicle braking time can be shortened and the braking efficiency can be improved.

[0088] The present application also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the following is achieved: Figure 1 The technical solution of the method for determining the amount of fluid replenishment during vehicle braking.

[0089] The present application provides a computer program product, the computer program product comprising a computer program, the computer program when executed by a processor to achieve the following Figure 1 The technical solution of the method for determining the amount of fluid replenishment during vehicle braking.

[0090] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of one embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present application.

[0091] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining the amount of fluid replenishment during vehicle braking, characterized in that: The method comprises: During the deceleration of the vehicle, determining a travel distance corresponding to the consumption of all brake fluid by the vehicle; When an anti-lock braking system (ABS) of the vehicle is triggered, determining a current vehicle speed and a current deceleration of the vehicle; Calculating, based on the current deceleration, a braking distance required for the vehicle to brake from the current vehicle speed to rest; Determining the total amount of brake fluid of the vehicle, and calculating the amount of fluid replenishment required for the vehicle to be reversed according to the total amount of brake fluid, the travel distance, and the braking distance; The step of calculating the amount of fluid replenishment required for the vehicle according to the total amount of brake fluid, the driving distance and the braking distance comprises: According to the following formula, calculate the required return fluid replenishment volume V of the vehicle x : ； Wherein, X is the braking distance, X1 is the driving distance, and V0 is the total amount of brake fluid.

2. The method according to claim 1, characterized in that During the deceleration of the vehicle, the step of determining the driving distance corresponding to the vehicle consuming all the brake fluid comprises: When the vehicle starts to decelerate, the current position of the vehicle is used as the starting position; Check whether all the brake fluid in the oil tank has been pressed into the caliper; When all the brake fluid in the oil tank is pressed into the caliper, the current position of the vehicle is taken as the end position; The distance from the starting position to the ending position is calculated, and the distance is used as the driving distance corresponding to the vehicle consuming all the brake fluid.

3. The method according to claim 1, characterized in that The step of calculating the braking distance required for the vehicle to stop from the current vehicle speed according to the current deceleration comprises: The braking distance required for the vehicle to decelerate uniformly from the current vehicle speed to zero at the current deceleration is calculated.

4. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: The brake fluid controlling the return fluid replenishment amount flows back to the oil tank from the pressure relief circuit.

5. A device for determining the amount of fluid replenishment during vehicle braking, characterized in that: The device comprises: A driving distance determination module, used to determine the driving distance corresponding to the consumption of all brake fluid by the vehicle during the deceleration of the vehicle; A driving parameter determination module, used for determining the current speed and current deceleration of the vehicle when an anti-lock braking system (ABS) of the vehicle is triggered; A braking distance calculation module, used for calculating the braking distance required for the vehicle to stop from the current vehicle speed according to the current deceleration; a fluid replenishment amount calculation module, used to determine the total amount of brake fluid in the vehicle, and calculate the amount of fluid replenishment required for the vehicle to return based on the total amount of brake fluid, the travel distance and the braking distance; The fluid replenishment volume calculation module is specifically used for: According to the following formula, calculate the required return fluid replenishment volume V of the vehicle x : ； Wherein, X is the braking distance, X1 is the driving distance, and V0 is the total amount of brake fluid.

6. The device according to claim 5, characterized in that The driving distance determination module is specifically used for: When the vehicle starts to decelerate, the current position of the vehicle is used as the starting position; Check whether all the brake fluid in the oil tank has been pressed into the caliper; When all the brake fluid in the oil tank is pressed into the caliper, the current position of the vehicle is taken as the end position; The distance from the starting position to the ending position is calculated, and the distance is used as the driving distance corresponding to the vehicle consuming all the brake fluid.

7. The device according to claim 5, characterized in that The braking distance calculation module is specifically used for: The braking distance required for the vehicle to decelerate uniformly from the current vehicle speed to zero at the current deceleration is calculated.

8. The device according to any one of claims 5 to 7, characterized in that: The device also includes: The control module is used to control the brake fluid of the return replenishment amount to flow from the pressure relief circuit back to the oil tank.

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