Vehicle braking control method and system and vehicle

Abstract

The invention discloses a vehicle braking control method and system and a vehicle, and belongs to the technical field of automobiles. The vehicle braking control method comprises the steps that working condition information of a preset type of a vehicle is collected; whether preset intelligent braking control is triggered or not is determined according to the working condition information; if the intelligent braking control is triggered, whether the brake pedal stroke of the vehicle exceeds a preset stroke threshold value or not is judged; if the brake pedal stroke is larger than the stroke threshold value, target request torque is determined according to the working condition information; and controlling an engine of the vehicle to perform wheel end braking according to the target request torque. According to the vehicle braking control method and system, the braking distance after braking failure can be effectively shortened, panic of a driver is reduced, and driving is safer.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobiles, and in particular relates to a vehicle braking control method, system and vehicle. Background Art

[0002] With the rapid development of the automobile industry, there are more and more controllers in automobiles, and there is a possibility of controller failure. When the brake assist system fails and degrades, the intelligent control system cannot provide brake assist when the driver steps on the brake pedal. The braking force needs to rely entirely on the driver stepping on the brake pedal to build pressure in the master cylinder to provide braking force. However, the brake pedal force is heavy at this time, which may cause inexperienced drivers to lack confidence in braking and cause panic.

[0003] Therefore, designing an intelligent braking control method and system that can actively request auxiliary braking from the vehicle controller after the braking booster system fails, as well as a vehicle with such a system, has become an urgent problem to be solved. Summary of the invention

[0004] In order to solve the above problems, the present invention specifically provides the following technical solutions.

[0005] The present invention provides a vehicle braking control method, comprising the following steps:

[0006] S1, collecting working condition information of preset types of vehicles;

[0007] S2, determining whether to trigger a preset intelligent braking control according to the working condition information;

[0008] S3, if the intelligent brake control is triggered, determining whether the brake pedal travel of the vehicle exceeds a preset travel threshold;

[0009] S4, if the brake pedal travel is greater than the travel threshold, determining the target requested torque according to the operating condition information;

[0010] S5, controlling the engine of the vehicle to perform wheel-end braking according to the target requested torque.

[0011] Optionally, in step S1, the preset types of operating condition information include instrument panel indicator light information, vehicle communication status information, brake pedal status information, vehicle speed information, brake assist system status information and vehicle controller status information; wherein the brake pedal status information includes brake pedal travel.

[0012] Optionally, step S2 includes triggering the intelligent braking control when it is determined that the following conditions are all met:

[0013] The preset types of instrument panel indicators light up;

[0014] The vehicle communication status is normal;

[0015] The brake pedal travel is greater than zero;

[0016] The vehicle speed is equal to or greater than a preset vehicle speed threshold;

[0017] The brake assist system status is faulty;

[0018] The vehicle controller status is normal.

[0019] Optionally, in step S1, the brake pedal state information also includes the brake pedal stepping speed; and step S4 includes the following sub-steps:

[0020] S41, after the intelligent brake control is triggered, the target torque request gradient is determined by querying a pre-established target torque gradient table according to the brake pedal travel and the vehicle speed;

[0021] S42, determining the target requested torque by querying a pre-established target torque table according to the brake pedal stroke, the brake pedal depression speed and the target torque request gradient.

[0022] Optionally, the present invention further provides a vehicle braking control system, comprising:

[0023] A data acquisition module, used to collect preset types of operating condition information of the vehicle;

[0024] A brake control module, used to receive preset types of operating condition information and determine whether to trigger or exit a preset intelligent brake control system;

[0025] A torque determination module, configured to determine a target torque request by looking up a pre-established target torque table according to the operating condition information and the target torque request gradient;

[0026] The braking execution module of the vehicle controller controls the vehicle's engine to perform wheel-end braking according to the target requested torque.

[0027] Optionally, the brake control module includes:

[0028] A travel determination unit, used to determine whether the brake pedal travel is greater than zero or greater than a preset travel threshold;

[0029] The vehicle speed determination unit is used to determine whether the current vehicle speed is equal to or greater than a preset vehicle speed threshold.

[0030] The torque determination module includes:

[0031] A request gradient determination unit, used to determine a target torque request gradient according to operating condition information;

[0032] The target torque determination unit is used to determine the target torque request according to the operating condition information and the target torque request gradient.

[0033] Optionally, the preset types of operating condition information collected by the data acquisition module include instrument panel indicator light information, vehicle communication status information, brake pedal status information, vehicle speed information, brake assist system status information and vehicle controller status information; wherein the brake pedal status information includes brake pedal travel and brake pedal pedaling speed.

[0034] Optionally, the brake control module triggers the intelligent brake control system when determining that the following conditions are all met:

[0035] The preset type of instrument panel indicator light is on; the vehicle communication status is normal; the judgment result of the travel judgment unit is that the brake pedal travel is greater than zero; the judgment result of the vehicle speed judgment unit is that the vehicle speed is equal to or greater than the preset vehicle speed threshold; the brake assist system status is faulty; the vehicle controller status is normal.

[0036] Optionally, after the intelligent brake control system is triggered:

[0037] The request gradient determination unit determines the target torque request gradient by querying a pre-established target torque gradient table according to the brake pedal stroke and the vehicle speed;

[0038] The target torque determination unit determines the target request torque by looking up a pre-established target torque table according to the brake pedal stroke, the brake pedal depression speed and the target torque request gradient.

[0039] Optionally, the present invention also provides a vehicle comprising the brake control system of the present invention.

[0040] Through the above technical solution, when the brake assist system fails, the driver steps on the brake pedal, and the intelligent brake control system is triggered by the change in the brake pedal stroke. The intelligent brake control system obtains the target requested torque through detection, judgment, and data processing, and sends this demand to the vehicle controller, which drives the motor to assist in braking. In this process, the braking distance after brake failure is effectively shortened, reducing the driver's panic and making driving safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic flow chart of a vehicle braking control method in an embodiment of the present invention;

[0042] Figure 2 Schematic diagram of various modules in a vehicle braking control system in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The scheme in the embodiment of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making any innovations belong to the protection scope of the present invention.

[0044] The specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Although the various steps in the flowchart in the embodiment of the present invention are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence in the order indicated by the arrows. Unless clearly stated herein, the execution of these steps is not strictly limited in order, and they can be performed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0045] In the subsequent description, the suffixes such as "module" and "device" used to represent elements are only used to facilitate the description of this application and have no specific meaning. Therefore, "module" and "device" can be used in a mixed manner. Although the terms first and second may be used to describe various information in this article, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other.

[0046] Figure 1 Schematic diagram of the process of the vehicle braking control method in an embodiment of the present invention.

[0047] like Figure 1 As shown, in one aspect of the present invention, an embodiment provides a vehicle braking control method. When the brake booster system fails and is degraded and the driver has a braking demand, the vehicle braking control device actively requests the vehicle controller to control the engine to provide electric braking according to the driver's demand, so as to achieve the purpose of assisting the driver in braking. The method includes the following steps:

[0048] S1, collecting preset types of operating condition information of the vehicle.

[0049] The step S1 may include the following specific operations: the vehicle brake control device is connected to the vehicle instrument panel sensor, the vehicle communication device sensor, the brake pedal sensor, the vehicle speed detection device sensor, the brake booster sensor and the vehicle controller of the vehicle, and the vehicle brake control device collects preset types of working condition information of the vehicle through these sensors. In this embodiment, in order to achieve the purpose of auxiliary braking by using the preset intelligent brake control after the brake booster system fails, the preset working condition information may be the instrument panel indicator light information, the vehicle communication status information, the brake pedal status information, the vehicle speed information, the brake booster system status information and the vehicle controller status information, wherein the brake pedal status information may include the brake pedal travel and the brake pedal stepping speed.

[0050] S2: Determine whether to trigger the preset intelligent braking control according to the working condition information.

[0051] The step S2 may include the following specific operations: the vehicle brake control device determines whether to trigger the preset intelligent brake control based on the preset types of working condition information reflected by the vehicle instrument panel sensor, the vehicle communication device sensor, the brake pedal sensor, the vehicle speed detection device sensor, the brake booster sensor and the vehicle controller. In this embodiment, the vehicle brake control device triggers the preset intelligent brake control when it is determined that the following conditions are met:

[0052] The instrument panel ready indicator lights up;

[0053] The vehicle communication status is normal;

[0054] The brake pedal travel is greater than zero;

[0055] The vehicle speed is equal to or greater than a preset vehicle speed threshold, wherein the preset vehicle speed threshold may be 1-8 kilometers per hour, and in this embodiment, preferably 3 kilometers per hour;

[0056] The brake assist system status is faulty;

[0057] The vehicle controller status is normal.

[0058] S3: If the intelligent braking control is triggered, it is determined whether the brake pedal travel of the vehicle exceeds a preset travel threshold.

[0059] The step S3 may include the following specific operations: if the intelligent braking control is triggered, the vehicle braking control device determines whether the vehicle's brake pedal travel exceeds a preset travel threshold, wherein the preset travel threshold may be 8-12 mm, and in this embodiment, preferably 10 mm.

[0060] S4: If the brake pedal travel is greater than the travel threshold, determine the target requested torque according to the operating condition information.

[0061] The step S4 may include the following specific operations: if the vehicle brake control device determines that the brake pedal stroke is greater than the stroke threshold, the vehicle brake control device queries a target torque gradient table established in advance in the brake assist system based on the brake pedal stroke and the vehicle speed as parameters to determine the target torque request gradient according to the current brake pedal stroke and the current vehicle speed data;

[0062] The vehicle brake control device then determines the target requested torque by querying the target torque table pre-established in the brake assist system with the brake pedal stroke and brake pedal speed as parameters based on the current brake pedal stroke, the current brake pedal speed and the target torque request gradient data obtained in the previous step.

[0063] S5, controlling the engine of the vehicle to perform wheel-end braking according to the target requested torque.

[0064] The step S5 may include the following specific operations: the vehicle brake control device sends the target requested torque obtained in the previous step to the vehicle controller, and actively requests the vehicle controller to further control the vehicle's engine to perform wheel-end braking.

[0065] Figure 2 Schematic diagram of various modules in a vehicle braking control system in an embodiment of the present invention.

[0066] like Figure 2 As shown, an embodiment of another aspect of the present invention provides a vehicle braking control system, including: a data acquisition module 10 , a braking control module 20 , a torque determination module 30 and a braking execution module 40 .

[0067] The data acquisition module 10 is connected to the vehicle instrument panel sensor, the vehicle communication device sensor, the brake pedal sensor, the vehicle speed detection device sensor, the brake booster sensor and the vehicle controller of the vehicle, and is used to collect preset types of working condition information of the vehicle. In this embodiment, the working condition information collected by the data acquisition module 10 may be instrument panel indicator light information, vehicle communication status information, brake pedal status information, vehicle speed information, brake booster system status information and vehicle controller status information, wherein the brake pedal status information may include brake pedal travel and brake pedal stepping speed;

[0068] The brake control module 20 includes a travel determination unit 21 and a vehicle speed determination unit 22. The brake control module 20 is connected to the data acquisition module 10 for communication, and is used to receive preset types of working condition information and determine whether to trigger or exit the preset intelligent brake control system. In this embodiment, the brake control module 20 triggers the preset intelligent brake control system when it is determined that the following conditions are met:

[0069] The instrument panel ready indicator lights up;

[0070] The vehicle communication status is normal;

[0071] The judgment result of the travel judgment unit 21 is that the brake pedal travel is greater than zero;

[0072] The vehicle speed determination unit 22 determines that the vehicle speed is equal to or greater than a preset vehicle speed threshold, wherein the preset vehicle speed threshold may be 1-8 kilometers per hour, and in this embodiment, 3 kilometers per hour is preferred;

[0073] The brake assist system status is faulty;

[0074] The vehicle controller status is normal.

[0075] If all the above conditions are met, the preset intelligent braking control system is triggered, and the stroke judgment unit 21 in the braking control module 20 determines whether the brake pedal stroke is greater than the preset stroke threshold, where the preset stroke threshold can be 8-12 mm, and the preferred embodiment is 10 mm.

[0076] The torque determination module 30 includes a request gradient determination unit 31 and a target torque determination unit 32. The request gradient determination unit 31 is used to determine the target torque request gradient by querying a target torque gradient table established in advance in the brake assist system with the brake pedal stroke and the vehicle speed as parameters according to the current brake pedal stroke and the current vehicle speed after judging whether the brake pedal stroke is greater than the preset stroke threshold;

[0077] The target torque determination unit 32 is used to determine the target requested torque based on the current brake pedal stroke, the current brake pedal depression speed and the target torque request gradient obtained by the request gradient determination unit, by querying the target torque table established in the brake assist system with the brake pedal stroke and the brake pedal depression speed as parameters.

[0078] The braking execution module 40 and the torque determination module 30 send the obtained target request torque to the vehicle controller. The braking execution module 40 of the vehicle controller controls the engine of the vehicle to perform wheel-end braking according to the target request torque.

[0079] In addition, in this embodiment, the brake control module 20 exits the preset intelligent brake control system when it is determined that one of the following conditions is met:

[0080] The vehicle speed is less than a preset vehicle number threshold, wherein the preset vehicle speed threshold may be 1-8 kilometers per hour, and in this embodiment, preferably 3 kilometers per hour;

[0081] Brake pedal travel equals zero;

[0082] The vehicle controller status is faulty;

[0083] The brake assist system status is normal.

[0084] Another aspect of the present invention also includes a vehicle, which includes the brake control system of the present invention.

[0085] Through the above embodiments, it can be known that the technical solution disclosed by the present invention is that after the brake assist system fails, the driver steps on the brake pedal, and the intelligent brake control system is triggered by the change of the brake pedal stroke. The intelligent brake control system collects the travel information of the brake pedal, and then determines whether the brake pedal stroke is greater than the preset travel threshold. If the pedal stroke is greater than the preset travel threshold, the target torque request gradient is determined by checking the pre-established target request gradient table according to the current driver's brake pedal stroke and the current vehicle speed. Then, the target request torque is obtained by checking the pre-established target request torque table according to the obtained target request gradient and the current driver's brake pedal stroke and brake pedal speed. Finally, the target request torque is sent to the vehicle controller, and the vehicle controller drives the motor to assist in braking. In this process, the braking distance after brake failure is effectively shortened, the driver's panic is reduced, and driving is safer.

[0086] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] In this document, the terms "comprises," "comprising" or any other variations thereof are intended to cover a non-exclusive inclusion of elements other than those listed and may also include other elements not expressly listed.

[0088] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A vehicle braking control method, characterized in that: The following steps are involved: S1, collecting working condition information of preset types of vehicles; S2, determining whether to trigger a preset intelligent braking control according to the working condition information; S3, if the intelligent braking control is triggered, determining whether the brake pedal travel of the vehicle exceeds a preset travel threshold; S4, if the brake pedal stroke is greater than the stroke threshold, determining a target requested torque according to the operating condition information; S5, controlling the engine of the vehicle to perform wheel-end braking according to the target requested torque.

2. The vehicle braking control method according to claim 1, characterized in that: In step S1, the preset types of operating condition information include instrument panel indicator light information, vehicle communication status information, brake pedal status information, vehicle speed information, brake assist system status information and vehicle controller status information; wherein the brake pedal status information includes brake pedal travel.

3. The vehicle braking control method according to claim 2, characterized in that: The step S2 includes triggering the intelligent braking control when it is determined that the following conditions are all met: The preset types of instrument panel indicators light up; The vehicle communication status is normal; The brake pedal travel is greater than zero; The vehicle speed is equal to or greater than a preset vehicle speed threshold; The brake assist system status is faulty; The vehicle controller status is normal.

4. The vehicle braking control method according to claim 2, characterized in that: In the step S1, the brake pedal state information also includes a brake pedal stepping speed; The step S4 comprises the following sub-steps: S41, after the intelligent brake control is triggered, a target torque request gradient is determined by querying a pre-established target torque gradient table according to the brake pedal travel and the vehicle speed; S42: determining the target requested torque by querying a pre-established target torque table according to the brake pedal stroke, the brake pedal depression speed, and the target torque request gradient.

5. A vehicle braking control system, characterized in that: include: A data acquisition module, used to collect preset types of operating condition information of the vehicle; A brake control module, used to receive preset types of operating condition information and determine whether to trigger or exit a preset intelligent brake control system; A torque determination module, configured to determine a target torque request by looking up a pre-established target torque table according to the operating condition information and the target torque request gradient; A braking execution module, the braking execution module of the vehicle controller controls the engine of the vehicle to perform wheel-end braking according to the target requested torque.

6. The vehicle braking control system according to claim 5, characterized in that: The brake control module comprises: A travel determination unit, used to determine whether the brake pedal travel is greater than zero or greater than a preset travel threshold; The vehicle speed determination unit is used to determine whether the current vehicle speed is equal to or greater than a preset vehicle speed threshold. The torque determination module comprises: a request gradient determining unit, configured to determine a target torque request gradient according to the operating condition information; The target torque determination unit is configured to determine a target requested torque according to the operating condition information and the target torque request gradient.

7. The vehicle braking control system according to claim 5, characterized in that: The preset types of operating condition information collected by the data acquisition module include instrument panel indicator light information, vehicle communication status information, brake pedal status information, vehicle speed information, brake assist system status information and vehicle controller status information; wherein the brake pedal status information includes brake pedal travel and brake pedal pedaling speed.

8. The vehicle braking control system according to claim 6, characterized in that: The brake control module triggers the intelligent brake control system when determining that the following conditions are met: The preset types of instrument panel indicators light up; The vehicle communication status is normal; The judgment result of the stroke judgment unit is that the brake pedal stroke is greater than zero; The vehicle speed determination unit determines that the vehicle speed is equal to or greater than a preset vehicle speed threshold; The brake assist system status is faulty; The vehicle controller status is normal.

9. The vehicle brake control system according to claim 7, characterized in that: After the intelligent brake control system is triggered: The request gradient determination unit determines the target torque request gradient by querying a pre-established target torque gradient table according to the brake pedal stroke and the vehicle speed; The target torque determination unit determines the target request torque by looking up a pre-established target torque table according to the brake pedal stroke, the brake pedal depression speed, and the target torque request gradient.

10. A vehicle, characterized in that: Comprising a brake control system as claimed in claim 5.

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