Disc gap control method and device, electronic mechanical braking system and vehicle

Abstract

The invention discloses a disc gap control method and device, an electronic mechanical braking system and a vehicle, the method is suitable for the electronic mechanical braking system, and the method comprises the steps that an input signal related to disc gap control is obtained; determining the type of the driving state of the vehicle according to the input signal; wherein the driving state comprises a braking-free working condition, a conventional braking working condition and an emergency braking working condition; and adjusting the disc gap according to the type of the driving state. According to the embodiment of the invention, dragging of the braking system in the vehicle running process can be avoided, energy loss is reduced, and the driving efficiency is improved. In addition, response time during emergency braking can be shortened, dragging torque of a braking system is reduced, and vehicle safety and braking efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic mechanical brake control, and in particular to a disc gap control method and device, an electronic mechanical brake system and a vehicle. Background Art

[0002] As the global automotive industry rapidly evolves toward electrification and intelligent driving, traditional braking systems are facing unprecedented demands for technological innovation. Managing the gap between the brake disc and friction pad has become a key factor affecting braking performance, response speed, and energy recovery efficiency.

[0003] The hydraulic system generates hydraulic pressure by pushing the master cylinder piston through the brake pedal. This pressure is transmitted through the brake lines to the caliper, pushing the friction pads against the brake discs to achieve braking. The system cannot autonomously control the friction pads' retraction. Electronic Hydraulic Braking (EHB) systems actively eliminate initial disc clearance through an electronically controlled hydraulic unit and can dynamically compensate for clearance changes caused by wear during braking. However, their adjustment accuracy and response time are limited by the characteristics of the hydraulic system. Electro-mechanical Braking (EMB) systems, by virtue of their fully electronic control, demonstrate significant advantages in adaptive clearance adjustment, pointing the way for the development of next-generation intelligent braking systems.

[0004] Existing braking systems, including traditional hydraulic brake systems and EHB systems, lack the ability to dynamically adjust brake disc clearance in real time. Traditional hydraulic brake systems typically cannot automatically adjust brake disc clearance. During driving, especially on bumpy roads, the brake disc repeatedly vibrates against the friction pads, causing uneven wear or increased disc clearance. This requires mechanical adjustment devices, such as manual adjustment bolts, or regular maintenance to compensate for the friction pad clearance. EHB systems have a limited ability to adjust disc clearance, rapidly building pressure to eliminate disc clearance during the initial braking phase, thus shortening brake response time. However, EHB systems rely on hydraulic systems and have a certain degree of hysteresis, making them unable to precisely control the position of the friction pads. Furthermore, they cannot actively move the brake disc away to increase disc clearance, thus failing to eliminate the drag torque of the brake system and lacking the ability to dynamically adjust disc clearance in real time. Existing brake systems are unable to dynamically adjust brake disc clearance in real time, increasing the drag torque of the brake system, resulting in energy loss, reduced driving efficiency, and prolonged brake response time, posing a potential risk to vehicle safety. Summary of the Invention

[0005] The present invention provides a disc gap control method and device, an electromechanical brake system, and a vehicle. These methods can prevent brake system drag during vehicle operation, reduce energy loss, and improve driving efficiency. They can also shorten emergency braking response time, reduce brake system drag torque, and improve vehicle safety and braking efficiency.

[0006] In a first aspect, an embodiment of the present invention provides a disc gap control method applicable to an electronic mechanical brake system, the disc gap control method comprising:

[0007] obtaining input signals related to disc gap control;

[0008] Determining the type of the vehicle's driving state based on the input signal; wherein the driving state includes a no-braking condition, a normal braking condition, and an emergency braking condition;

[0009] The disc gap is adjusted according to the type of driving condition.

[0010] Optionally, the acquiring of an input signal related to disk gap control includes:

[0011] Obtaining original signals of the vehicle's speed, acceleration, wheel speed, accelerator pedal position, distance to the preceding vehicle, and traffic light status;

[0012] All the original signals are subjected to signal filtering, data synchronization and outlier removal to serve as the input signals.

[0013] Optionally, determining the category of the vehicle's driving state according to the input signal includes:

[0014] When the acceleration is greater than a preset acceleration, or the rate of change of the accelerator pedal depression is greater than a first preset rate of change, or the distance between the preceding vehicles is greater than a preset safety distance, it is determined that the vehicle is in a braking-free operating condition.

[0015] Optionally, determining the category of the vehicle's driving state according to the input signal includes:

[0016] When the vehicle speed is greater than a preset speed and the accelerator pedal position is less than a preset position, or it is determined that subsequent braking is required based on the traffic light status and the distance to the vehicle in front, or the rate of change of releasing the accelerator pedal is less than a second preset rate of change, it is determined that the vehicle is in a normal braking condition.

[0017] Optionally, determining the category of the vehicle's driving state according to the input signal includes:

[0018] When the rate of change of the accelerator pedal release is greater than a second preset rate of change, or the distance between the preceding vehicles is less than a preset safety distance, it is determined that the vehicle is in an emergency braking condition.

[0019] Optionally, adjusting the disc gap according to the driving state category includes:

[0020] When it is determined that the vehicle is in a braking-free operating state, the disc gap is adjusted to a maximum level; wherein, when the disc gap is at the maximum level, the disc gap is a minimum disc gap without brake system drag;

[0021] When it is determined that the vehicle is in a normal braking condition, the disc gap is adjusted to an intermediate position; wherein, when the disc gap is in the intermediate position, the disc gap is half of the disc gap in the maximum position;

[0022] When it is determined that the vehicle is in an emergency braking condition, the disc gap is adjusted to a minimum gear; wherein, when the disc gap is at the minimum gear, the disc gap is 0.

[0023] In a second aspect, an embodiment of the present invention further provides a disk gap control device, comprising:

[0024] An input signal acquisition module, used for acquiring input signals related to disc gap control;

[0025] a driving state category determination module, configured to determine the category of the vehicle's driving state based on the input signal acquired by the input signal acquisition module; wherein the driving state includes a no-braking condition, a normal braking condition, and an emergency braking condition;

[0026] The disc gap adjustment module is configured to adjust the disc gap according to the category of the driving state determined by the driving state category determination module.

[0027] Optionally, the input signal acquisition module includes:

[0028] an original signal acquisition unit, configured to acquire original signals of the vehicle's speed, acceleration, wheel speed, accelerator pedal position, distance to the preceding vehicle, and traffic light status;

[0029] The original signal processing unit is used to perform signal filtering, data synchronization and outlier elimination on the original signals acquired by all the original signal acquisition units, and then use them as the input signals.

[0030] In a third aspect, an embodiment of the present invention further provides an electromechanical brake system, which uses the disc gap control method described in the first aspect to adjust the disc gap.

[0031] In a fourth aspect, an embodiment of the present invention further provides a vehicle comprising the electronic mechanical braking system described in the third aspect.

[0032] Embodiments of the present invention provide a disc gap control method, device, electronic mechanical braking system, and vehicle. These methods obtain input signals related to disc gap control; determine the vehicle's driving state based on the input signals; and adjust the disc gap based on the driving state. Embodiments of the present invention can predict braking needs based on driving conditions, pre-adjust the friction plates to an appropriate position, and dynamically adjust the disc gap, thereby avoiding brake system drag during vehicle operation, reducing energy loss, and improving driving efficiency. By fully utilizing the adjustable friction plate gap of the EMB system and pre-adjusting the disc gap based on driving conditions, the system shortens the response time during emergency braking, reduces the drag torque of the brake system, and improves vehicle safety and braking efficiency.

[0033] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 is a flow chart of a disk gap control method provided by an embodiment of the present invention;

[0036] Figure 2 is a flow chart of another disk gap control method provided by an embodiment of the present invention;

[0037] Figure 3 1 is a schematic structural diagram of a disk gap control device provided by an embodiment of the present invention;

[0038] Figure 4 It is a structural schematic diagram of another disk gap control device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] Figure 1 This is a flow chart of a disc gap control method provided by an embodiment of the present invention. This embodiment is applicable to an electronic mechanical brake system. The method can be executed by a disc gap control device, which can be implemented in the form of hardware and / or software. Figure 1 , the method comprises the following steps:

[0042] S110 : Acquire an input signal related to disk gap control.

[0043] Specifically, the input signals related to the disc gap control may include vehicle speed, acceleration, wheel speed, accelerator pedal position, distance to the vehicle in front, and traffic light status signals. By obtaining vehicle information and information collected by the intelligent driving system, the input signals related to the disc gap control can be obtained.

[0044] S120. Determine the type of the vehicle's driving state based on the input signal; wherein the driving state includes a no-braking condition, a normal braking condition, and an emergency braking condition.

[0045] Specifically, based on the input signal, the category of the vehicle's driving status is determined, and the driving scenario can be judged in real time, thereby predicting the driver's braking needs in the future. The vehicle's driving status is divided into no-braking conditions, conventional braking conditions, and emergency braking conditions, so that the disc clearance can be dynamically adjusted according to the driving scenario.

[0046] S130: Adjust the disc gap according to the type of driving state.

[0047] Specifically, for operating conditions requiring high lag and no braking, the disc clearance can be adjusted to maximum. For emergency braking conditions requiring high response time, the disc clearance can be adjusted to minimum. For conventional braking conditions requiring a balance between lag and response time, the disc clearance can be adjusted to an intermediate level. The friction plate position can be precisely controlled by controlling the motor's rotation to drive the transmission system to push the piston.

[0048] It can be understood that by adjusting the disc gap according to the type of driving state, the brake disc gap can be dynamically adjusted, which can balance the brake drag and response time to achieve a high-performance braking effect.

[0049] The present invention anticipates braking needs based on driving conditions, pre-adjusting the friction pads to the appropriate position and dynamically adjusting the disc gap. This prevents brake system drag during vehicle operation, reduces energy loss, and improves driving efficiency. By leveraging the adjustable friction pad gap of the EMB system and pre-adjusting the disc gap based on driving conditions, the system shortens emergency braking response time, reduces brake system drag torque, and improves vehicle safety and braking efficiency.

[0050] Figure 2 This is a flow chart of another disk gap control method provided by an embodiment of the present invention, referring to Figure 2 , the method comprises the following steps:

[0051] S210: Obtain original signals of vehicle speed, acceleration, wheel speed, accelerator pedal position, distance to the preceding vehicle, and traffic light status.

[0052] Specifically, the vehicle information in the embodiment of the present invention can be combined with the information collected by the intelligent driving system. The vehicle speed, acceleration and accelerator pedal position can be obtained by obtaining CAN bus signals, the wheel speed information can be obtained by the wheel speed sensor at the wheel end of the vehicle, and the distance to the preceding vehicle and the status of traffic lights can be collected by the intelligent driving system.

[0053] S220 , performing signal filtering, data synchronization, and outlier removal on all original signals to use as input signals.

[0054] Optionally, based on the above embodiment, step S110 may include step S210 and step S220.

[0055] As you can understand, signal filtering removes high-frequency noise, data synchronization ensures signal time alignment, and outlier removal prevents interference from sensor failures. After preprocessing all raw signals through signal filtering, data synchronization, and outlier removal, they are used as input signals to ensure data accuracy.

[0056] S231: When the acceleration is greater than a preset acceleration, or the rate of change of the accelerator pedal depression is greater than a first preset rate of change, or the distance to the preceding vehicle is greater than a preset safety distance, it is determined that the vehicle is in a braking-free condition.

[0057] The first preset change rate and the preset safe distance are set according to actual conditions. Specifically, the vehicle radar and the intelligent driving vision system determine whether the distance to the preceding vehicle is greater than the preset safe distance.

[0058] Optionally, based on the above embodiment, step S120 may include step S231.

[0059] S232: When the vehicle speed is greater than a preset speed and the accelerator pedal position is less than a preset position, or it is determined that subsequent braking is required based on the traffic light status and the distance to the vehicle in front, or the rate of change of the accelerator pedal being released is less than a second preset rate of change, it is determined that the vehicle is in a normal braking condition.

[0060] It is understood that when the vehicle speed is greater than a preset speed and the accelerator pedal position is less than a preset position, the vehicle is in a coasting state. Specifically, the vehicle speed sensor and accelerator pedal position are used to determine whether the vehicle is in a coasting state, and the intelligent driving system collects information about traffic light status and the congestion of the vehicle ahead to determine whether braking is necessary.

[0061] Optionally, based on the above embodiment, step S120 may include step S232.

[0062] S233: When the rate of change of the accelerator pedal being released is greater than a second preset rate of change, or the distance between the preceding vehicle and the preceding vehicle is less than a preset safety distance, it is determined that the vehicle is in an emergency braking condition.

[0063] The second preset change rate can be set according to actual conditions. Specifically, the vehicle radar and the intelligent driving system are used to determine whether the distance between the preceding vehicle and the preceding vehicle is less than the preset safe distance.

[0064] Optionally, based on the above embodiment, step S120 may include step S233.

[0065] S241. When it is determined that the vehicle is in a braking-free operating condition, adjust the disc clearance to a maximum level; wherein, when the disc clearance is at the maximum level, the disc clearance is a minimum disc clearance without brake system drag.

[0066] It is understandable that when it is determined that the vehicle is in a condition where no braking is required, in order to eliminate the drag torque caused by the braking system and to avoid taking too long to adjust to other control strategies, the disc gap is adjusted to the maximum level, that is, the minimum disc gap without brake system drag.

[0067] S242. When it is determined that the vehicle is in a normal braking condition, adjust the disc gap to an intermediate position; wherein, when the disc gap is at an intermediate position, the disc gap is half of the disc gap at a maximum position.

[0068] It is understandable that when it is determined that the vehicle is in a normal braking condition, in order to take into account both the drag torque and the response time, the disc gap is adjusted to the middle gear, that is, the disc gap is half of the maximum gear.

[0069] S243. When it is determined that the vehicle is in an emergency braking condition, adjust the disc gap to a minimum level; wherein, when the disc gap is at the minimum level, the disc gap is 0.

[0070] It is understandable that when it is determined that the vehicle is in an emergency braking condition, in order to enable the braking system to quickly respond to the braking request and generate clamping force, the disc gap is adjusted to the minimum gear, that is, the friction plate is tightly attached to the brake disc and the disc gap is 0.

[0071] It should be noted that the embodiment of the present invention sends a command to the EMB actuator motor, which drives the transmission mechanism to control the piston position through the rotation of the motor, thereby achieving precise control of the friction plate position, thereby adjusting the disc gap.

[0072] Optionally, based on the above embodiment, step S130 may include steps S241 to S243.

[0073] In summary, the embodiments of the present invention, by acquiring raw signals such as vehicle speed, acceleration, wheel speed, accelerator pedal position, distance to the preceding vehicle, and traffic light status in real time, can determine the driving scenario in real time and predict the driver's braking needs within a certain period of time. The vehicle's driving state is divided into no-braking conditions, routine braking conditions, and emergency braking conditions. The disc clearance can be dynamically adjusted based on the driving scenario. For no-braking conditions with high drag requirements, the disc clearance is adjusted to the maximum setting; for emergency braking conditions with high brake response time requirements, the disc clearance is adjusted to the minimum setting; and for routine braking conditions with balanced drag and response time requirements, the disc clearance is adjusted to an intermediate setting. The advantages of the method of the embodiments of the present invention over existing braking systems are that it can predict braking needs based on driving conditions, pre-adjust the friction pads to the appropriate position, and dynamically adjust the disc clearance, thus avoiding brake system drag during vehicle operation, reducing energy loss, and improving driving efficiency. For conditions requiring rapid pressure buildup, the response time is reduced, fully utilizing the high precision and hysteresis-free characteristics of the EMB system.

[0074] Figure 3 This is a schematic diagram of the structure of a disk gap control device provided by an embodiment of the present invention, with reference to Figure 3 The device includes: an input signal acquisition module 310, a driving state category determination module 320 and a disc gap adjustment module 330.

[0075] In an embodiment of the present invention, the input signal acquisition module 310 is used to obtain input signals related to disc gap control; the driving state category determination module 320 is used to determine the category of the vehicle's driving state based on the input signals obtained by the input signal acquisition module 310; wherein the driving state includes a no-braking condition, a conventional braking condition, and an emergency braking condition; the disc gap adjustment module 330 is used to adjust the disc gap based on the category of the driving state determined by the driving state category determination module 320.

[0076] Figure 4 This is a schematic diagram of the structure of another disk gap control device provided by an embodiment of the present invention. Optionally, based on the above embodiment, refer to Figure 4 The input signal acquisition module 310 includes: an original signal acquisition unit 311 and an original signal processing unit 312.

[0077] In an embodiment of the present invention, the original signal acquisition unit 311 is used to obtain the original signals of the vehicle speed, acceleration, wheel speed, accelerator pedal position, distance to the preceding vehicle, and traffic light status; the original signal processing unit 312 is used to perform signal filtering, data synchronization, and outlier elimination on all the original signals obtained by the original signal acquisition unit 311, and then use them as input signals.

[0078] The disk gap control device provided in the embodiments of the present invention can execute the disk gap control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. For matters not described in detail in the embodiments of the present invention, reference can be made to the disk gap control method provided in the above embodiments.

[0079] An embodiment of the present invention further provides an electromechanical brake system, which uses the disc gap control method of the above embodiment to adjust the disc gap.

[0080] An embodiment of the present invention further provides a vehicle, comprising the electronic mechanical braking system provided by the above embodiment.

[0081] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0082] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A disk gap control method, characterized in that: Applicable to an electronic mechanical brake system, the disc gap control method includes: obtaining input signals related to disc gap control; Determining the type of the vehicle's driving state based on the input signal; wherein the driving state includes a no-braking condition, a normal braking condition, and an emergency braking condition; The disc gap is adjusted according to the type of driving condition.

2. The disk gap control method according to claim 1, wherein: The obtaining of input signals related to the disk gap control comprises: Obtaining original signals of the vehicle's speed, acceleration, wheel speed, accelerator pedal position, distance to the preceding vehicle, and traffic light status; All the original signals are subjected to signal filtering, data synchronization and outlier removal to serve as the input signals.

3. The disk gap control method according to claim 2, wherein: Determining the type of the vehicle's driving state based on the input signal includes: When the acceleration is greater than a preset acceleration, or the rate of change of the accelerator pedal depression is greater than a first preset rate of change, or the distance between the preceding vehicles is greater than a preset safety distance, it is determined that the vehicle is in a condition where no braking is required.

4. The disk gap control method according to claim 2, wherein: Determining the type of the vehicle's driving state based on the input signal includes: When the vehicle speed is greater than a preset speed and the accelerator pedal position is less than a preset position, or it is determined that subsequent braking is required based on the traffic light status and the distance to the vehicle in front, or the rate of change of releasing the accelerator pedal is less than a second preset rate of change, it is determined that the vehicle is in a normal braking condition.

5. The disk gap control method according to claim 2, wherein: Determining the type of the vehicle's driving state based on the input signal includes: When the rate of change of the accelerator pedal release is greater than a second preset rate of change, or the distance between the preceding vehicles is less than a preset safety distance, it is determined that the vehicle is in an emergency braking condition.

6. The disk gap control method according to claim 1, wherein: The adjusting the disc gap according to the driving state category includes: When it is determined that the vehicle is in a braking-free operating state, the disc gap is adjusted to a maximum level; wherein, when the disc gap is at the maximum level, the disc gap is a minimum disc gap without brake system drag; When it is determined that the vehicle is in a normal braking condition, the disc gap is adjusted to an intermediate position; wherein, when the disc gap is in the intermediate position, the disc gap is half of the disc gap in the maximum position; When it is determined that the vehicle is in an emergency braking condition, the disc gap is adjusted to a minimum gear; wherein, when the disc gap is at the minimum gear, the disc gap is 0.

7. A disk gap control device, characterized in that: include: An input signal acquisition module, used for acquiring input signals related to disc gap control; a driving state category determination module, configured to determine the category of the vehicle's driving state based on the input signal acquired by the input signal acquisition module; wherein the driving state includes a no-braking condition, a normal braking condition, and an emergency braking condition; The disc gap adjustment module is configured to adjust the disc gap according to the category of the driving state determined by the driving state category determination module.

8. The disk gap control device according to claim 7, wherein: The input signal acquisition module includes: an original signal acquisition unit, configured to acquire original signals of the vehicle's speed, acceleration, wheel speed, accelerator pedal position, distance to the preceding vehicle, and traffic light status; The original signal processing unit is used to perform signal filtering, data synchronization and outlier elimination on the original signals acquired by all the original signal acquisition units, and then use them as the input signals.

9. An electromechanical braking system, characterized in that: The disk gap is adjusted using the disk gap control method according to any one of claims 1 to 7.

10. A vehicle, characterized in that: The electromechanical braking system according to claim 9 is included.

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