Electronic parking brake system, control device and control method for vehicle

Abstract

The present invention relates to a control device for an electronic parking brake system for a vehicle, the electronic parking brake system comprising: a parking brake trigger device, a sensing device, a parking brake device and a control device, the control device comprising an input module, a judgment module and an output module, and configured as follows: during vehicle driving, when the input module receives that the parking brake trigger device is actuated, the output module controls the parking brake device to perform deceleration braking; and when the input module receives that the parking brake trigger device is released, the judgment module determines whether the vehicle speed is greater than a preset speed: if the vehicle speed is greater than the preset speed, the output module controls the parking brake device to perform deceleration braking until the vehicle speed is less than or equal to the preset speed. The present invention also relates to an electronic parking brake system and a control method comprising the above-mentioned control device, as well as a computer-readable storage medium and a control device. According to the present invention, driving safety can be further improved and operation is convenient.

Description

Technical Field

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

[0002] With the popularity of the Electronic Parking Brake (EPB) system, more and more motor vehicles have eliminated the traditional handbrake handle and use the EPB system as a backup service brake device for the brake pedal while driving. When emergency braking is required during driving, in addition to the brake pedal, the EPB button can be manually actuated (for example, pulled up) to achieve the same function as pulling up the traditional handbrake handle, so that the vehicle can be decelerated to a stationary state according to the driver's requirements to meet the requirements of the regulatory authorities for motor vehicles. This deceleration braking function integrated in the EPB system is usually called the "deceleration control (Controller Deceleration Parking: CDP)" function.

[0003] For the existing EPB system, if the driver wants to activate the CDP function in an emergency, he needs to manually activate the EPB button and keep it activated. At this time, under the control of the Electronic Stability Program (ESP), the vehicle moves at a speed of about 8m / s. 2 The CDP function stops immediately once the driver releases the EPB button. However, since some users are not actually familiar with the CDP function of the EPB system, they may not have kept the EPB button in the actuated state when the CDP function is enabled. Alternatively, when driving at high speeds, the large deceleration caused by enabling the CDP function may cause the driver to lean forward due to inertia, causing his hand to leave the EPB button. In these cases, the normal activation of the CDP function may not be guaranteed, resulting in the vehicle being unable to decelerate as quickly as expected, which may threaten driving safety. For example, dangerous accidents such as colliding with the vehicle in front or running off the road may occur.

[0004] Therefore, there is a need for an electronic parking brake system for a vehicle that is safer and easier to operate and a control method thereof. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide an electronic parking brake system, a control device and a control method for a vehicle, so as to further improve driving safety and facilitate operation.

[0006] To this end, according to one aspect of the present invention, a control device for an electronic parking brake system of a vehicle is provided, the electronic parking brake system comprising:

[0007] a parking brake triggering device configured to be actuated and released by a user;

[0008] a sensing device configured to obtain a speed of the vehicle;

[0009] A parking brake device, the parking brake device being configured to be able to perform parking braking and deceleration braking on the vehicle;

[0010] Wherein, the control device comprises an input module, a judgment module and an output module, the input module is configured to receive the state information from the parking brake trigger device and the speed from the sensing device;

[0011] Wherein, the control device is further configured to:

[0012] During the driving of the vehicle, when the input module receives the state information that the parking brake trigger device is activated, the output module controls the parking brake device to perform deceleration braking on the vehicle; and

[0013] When the input module receives the status information that the parking brake trigger device is released, the judgment module judges whether the speed of the vehicle is greater than the preset speed, and performs the following actions according to the judgment result: if the speed of the vehicle is greater than the preset speed, the output module controls the parking brake device to perform deceleration braking on the vehicle until the speed of the vehicle is less than or equal to the preset speed.

[0014] Optionally, the control device is further configured to perform the following actions according to the judgment result: if the speed of the vehicle is less than or equal to the preset speed, the output module controls the parking brake device to stop applying deceleration braking to the vehicle.

[0015] Optionally, the input module further receives state information of an accelerator pedal of the vehicle, and if the accelerator pedal is in an accelerating state, the output module controls the parking brake device to stop decelerating the vehicle.

[0016] According to another aspect of the present invention, there is provided a control method for an electronic parking brake system for a vehicle, comprising:

[0017] During the driving of the vehicle, receiving state information that the parking brake triggering device is activated, and controlling the parking brake device to perform deceleration braking on the vehicle; and

[0018] Receive the state information of the parking brake trigger device being released and the speed of the vehicle, and determine whether the speed of the vehicle is greater than a preset speed, and perform the following actions according to the determination result: if the speed is greater than the preset speed, control the parking brake device to perform deceleration braking on the vehicle until the speed of the vehicle is less than or equal to the preset speed.

[0019] Optionally, the control method further comprises performing the following actions according to the judgment result: if the speed of the vehicle is less than or equal to the preset speed, controlling the parking brake device to stop decelerating the vehicle.

[0020] Optionally, the control method further comprises the following steps: receiving state information of an accelerator pedal of the vehicle, and if the accelerator pedal is in an accelerating state, controlling the parking brake device to stop applying deceleration braking to the vehicle.

[0021] According to yet another aspect of the present invention, a computer-readable storage medium is provided, on which program instructions are stored, wherein the program instructions can implement the above method when executed by a processor.

[0022] According to another aspect of the present invention, a control device for an electronic parking brake system of a vehicle is provided, the control device comprising a memory and a processor, wherein the memory stores program instructions that can be run on the processor, wherein the processor can implement the above method when executing the program instructions.

[0023] According to yet another aspect of the present invention, there is provided an electronic parking brake system for a vehicle, comprising the above-mentioned control device.

[0024] The electronic parking brake system, control device and control method for a vehicle provided by the present invention can dynamically control the deceleration braking function of the electronic parking brake system in sections by judging the state of the parking brake trigger device and the speed of the vehicle during driving. Even if the deceleration braking function is disabled due to the driver's hand slipping or misoperation, the vehicle can be ensured to be in a safe state, thereby further improving the safety of driving. In addition, by judging the state information of the accelerator pedal, the deceleration braking function can be interrupted at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] From the detailed description of the preferred embodiments of the present invention given below in conjunction with the accompanying drawings, those skilled in the art will be able to better understand the features and advantages of the present invention.

[0026] Figure 1 A schematic block diagram of an electronic parking brake system for a vehicle according to an embodiment of the present invention is shown;

[0027] Figure 2 Shows Figure 1 A flow chart of a control method for an electronic parking brake system of a vehicle is shown. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and exemplary embodiments. It should be understood that these exemplary embodiments do not mean to form any limitation on the present invention.

[0029] Figure 1 FIG. 1 is a schematic block diagram of an electronic parking brake system (hereinafter also referred to as “EPB system”) for a vehicle according to an embodiment of the present invention. Figure 1 As shown, the electronic parking brake system for a vehicle of the present application includes a parking brake triggering device 10 , a sensing device 20 , a parking brake device 30 and a control device 40 .

[0030] The parking brake trigger device 10 is configured to be actuated or released by a user (e.g., a driver) to trigger the parking brake device 30 to perform corresponding braking. Generally, the actuation of the parking brake trigger device 10 refers to the parking brake trigger device 10 being actuated and maintained in an actuated state, and the release refers to the parking brake trigger device 10 being released and restored to its original position or original state. During the driving of the vehicle, if the parking brake trigger device 10 is in an actuated state, the parking brake device 30 can perform deceleration braking on the vehicle, and play a role similar to that of a traditional hand brake, and if the parking brake trigger device 10 is released, the parking brake device 30 stops performing deceleration braking on the vehicle. Of course, during parking, the actuation and release of the parking brake trigger device 10 can trigger normal parking braking, which is not described in detail herein. In addition, the parking brake trigger device 10 can be implemented in a variety of ways, such as physical methods such as traditional EPB buttons, knobs, and pull rods, or virtual methods such as touch modules, voice modules, and somatosensory modules in user interfaces (UI). Of course, the parking brake trigger device 10 may also include other implementations that can trigger the parking brake device 30 developed in the future. Accordingly, the actuation and release of the parking brake trigger device 10 can also be achieved in a variety of ways. For example, the driver can actuate the physical parking brake trigger device 10 by pulling up, pressing down or rotating, or can actuate the virtual parking brake trigger device 10 by touching the user interface, voice control or body control. It should be noted that in the following embodiments, the parking brake trigger device 10 of the present invention is mainly described in the form of a traditional EPB button. The actuated and released state information of the parking brake trigger device 10 can be sent to the control device 40 at any time through the line.

[0031] The sensing device 20 is configured to obtain the speed of the vehicle, and may be, for example, a speed sensor of the vehicle. The sensing device 20 may send the obtained vehicle speed to the control device 40 .

[0032] The parking brake device 30 is configured to perform parking brake and deceleration brake on the vehicle. It should be noted that the current vehicle is usually equipped with a parking brake device 30 and a service brake device (for example, a pedal-type hydraulic brake device, not shown in the accompanying drawings), and the parking brake device 30 can be used as a supplement and backup device for the service brake device. The parking brake device 30 can be installed on the front axle and / or the rear axle of the vehicle, and can be one or multiple working in coordination. The parking brake device 30 widely used at present usually includes a brake disc, a brake caliper, a brake motor and a deceleration mechanism, etc., but the present invention is not limited to such parking brake devices. The parking brake device 30 can perform deceleration brake and normal parking brake on the vehicle according to the instructions of the control device 40. As mentioned above, the normal parking brake is not described in detail herein. The deceleration brake achieved by the parking brake device 30 during vehicle driving is generally achieved by friction between the brake disc and the brake caliper.

[0033] The control device 40 may be a module in the electronic stability system of the vehicle, or may be an independent control unit. The control device 40 may include an input module, a judgment module, and an output module (not shown), wherein the input module is configured to receive state information from the parking brake trigger device 10 and the speed from the sensing device 20, so as to control the parking brake device 30 via the output module to perform a deceleration control function (i.e., CDP function). According to an embodiment of the present invention, the control device 40 is configured such that during the driving of the vehicle, when the input module receives state information that the parking brake trigger device 10 is actuated (e.g., pulled up), the output module controls the parking brake device 30 to perform deceleration braking on the vehicle. Subsequently, when the input module receives state information that the parking brake trigger device 10 is released (e.g., restored to its original position), the judgment module determines whether the speed from the sensing device 20 (i.e., the current speed of the vehicle) is greater than a preset speed, and determines how to perform the next step according to the judgment result. In this case, if the judgment result is that the vehicle speed is greater than the preset speed, the output module controls the parking brake device 30 to decelerate the vehicle until the vehicle speed is less than or equal to the preset speed; conversely, if the judgment result is that the vehicle speed is less than or equal to the preset speed, the output module controls the parking brake device 30 to stop decelerating the vehicle.

[0034] The preset speed can be adjusted according to the road conditions, vehicle conditions, driving habits, etc. Generally speaking, the preset speed can be set to 20, 30 or 40 km / h, and of course it can also be set to other values. In the process of deceleration braking by the electronic parking brake system, the deceleration can be carried out according to the set braking force, or according to the variable braking force. In addition to the deceleration braking of the parking brake device 30, other auxiliary measures such as cutting off the oil circuit and slip control can also be accompanied.

[0035] In addition, if the above deceleration braking function is triggered due to hand slippage, misoperation, etc. during the driving of the vehicle, the driver may not want to enable the deceleration braking function, but hope to quickly resume normal driving. To this end, the input module can be further configured to receive state information of the accelerator pedal 50 of the vehicle. If the accelerator pedal 50 is in the accelerated state, the output module controls the parking brake device 30 to stop decelerating the vehicle. Otherwise, the deceleration braking of the vehicle continues.

[0036] The main structure of the electronic parking brake system for a vehicle of the present invention is briefly described above, but it should be understood that the above structure does not mean that the electronic parking brake system of the present invention cannot include other components.

[0037] In this way, when the deceleration braking function of the electronic parking brake system needs to be activated during driving, the user can manually actuate the parking brake trigger device 10 to achieve a function similar to the hand brake. When the parking brake trigger device 10 is released due to hand slip or misoperation, the control device 40 can continue to maintain or stop the deceleration braking function according to the current speed, thereby ensuring driving safety. The operation of the electronic parking brake system of the present invention will be further described in detail below in conjunction with its control method.

[0038] Reference Figure 2 , Figure 2 FIG. 2 is a flow chart showing a control method of an electronic parking brake system of the present invention. Figure 2 As shown, the method generally includes the following steps.

[0039] At step S1 , state information that the parking brake triggering device 10 is actuated (eg, pulled up) is received, and the parking brake device 30 is controlled to perform deceleration braking on the vehicle (ie, the CDP function is activated).

[0040] At step S2 , status information of whether the parking brake triggering device 10 is released is received: if not released, step S3 is executed; otherwise, if released, step S4 is executed.

[0041] At step S3 , the deceleration braking is continued (ie, the current CDP function is continued).

[0042] At step S4, the speed of the vehicle is received and it is determined whether the speed is greater than a preset speed: if it is less than or equal to the preset speed, step S5 is executed; otherwise, if it is greater than the preset speed, step S6 is executed.

[0043] At step S5, the deceleration braking is stopped (ie, the CDP function is stopped).

[0044] In step S6, the state information of the accelerator pedal 50 of the vehicle is received: if it is in the acceleration state, step S7 is executed; otherwise, if it is not in the acceleration state, step S8 is executed.

[0045] In step S7, the deceleration braking is stopped.

[0046] At step S8 , deceleration braking is continued until the speed of the vehicle is less than or equal to a preset speed.

[0047] In the steps of the above method, it is also possible to skip steps S6 and S7 directly without receiving the state information of the accelerator pedal 50. In this way, during the driving of the vehicle, if the parking brake trigger device 10 is actuated and released, and the current vehicle speed is greater than the preset speed, the control device 40 controls the parking brake device 30 to perform deceleration braking, regardless of whether the accelerator pedal 50 is in the accelerated state, thereby avoiding the danger that may be caused by the driver accidentally stepping on the accelerator pedal during emergency braking. Therefore, this option can be set in the control device 40.

[0048] In one embodiment of the present invention, a computer-readable storage medium is further provided, on which program instructions are stored, wherein the program instructions can implement the above method when executed by a processor.

[0049] In addition, in one embodiment of the present invention, a control device for an electronic parking brake system of a vehicle is provided, which includes a memory and a processor, wherein the memory stores program instructions that can be run on the processor, wherein the processor can implement the above method when executing the program instructions.

[0050] According to the present invention, by implementing segmented dynamic control on the electronic parking brake system of the vehicle, even if the deceleration braking function stops due to the driver's hand slipping or misoperation, the vehicle can be ensured to be in a safe state. In addition, in the case of misoperation by the driver, the deceleration braking can be quickly cancelled by the accelerator pedal, thereby ensuring driving safety while taking into account the convenience of operation.

[0051] The present invention has been described in detail above in conjunction with specific embodiments. Obviously, the above description and the embodiments shown in the accompanying drawings should be understood as exemplary and not to limit the present invention. For those skilled in the art, various modifications or variations can be made without departing from the spirit of the present invention, and these modifications or variations do not depart from the scope of the present invention.

Claims

1. A control device (40) for an electronic parking brake system of a vehicle, the electronic parking brake system comprising: a parking brake trigger device (10) configured to be actuable and releasable by a user; a sensing device (20), the sensing device being configured to acquire the speed of the vehicle; A parking brake device (30), the parking brake device being configured to be able to perform parking braking and deceleration braking on the vehicle; The control device (40) comprises an input module, a judgment module and an output module, wherein the input module is configured to receive status information from the parking brake trigger device (10) and speed from the sensing device (20); Characterized in that the control device (40) is further configured to: During the driving of the vehicle, when the input module receives state information that the parking brake trigger device (10) is activated, the output module controls the parking brake device (30) to perform deceleration braking on the vehicle; and When the input module receives the state information that the parking brake trigger device (10) is released, the judgment module judges whether the speed of the vehicle is greater than a preset speed, and performs the following actions according to the judgment result: if the speed of the vehicle is greater than the preset speed, the output module controls the parking brake device (30) to perform deceleration braking on the vehicle until the speed of the vehicle is less than or equal to the preset speed; The input module also receives status information of an accelerator pedal (50) of the vehicle, and if the accelerator pedal (50) is in an accelerating state, the output module controls the parking brake device (30) to stop decelerating the vehicle.

2. The control device (40) according to claim 1, characterized in that: The control device (40) is further configured to perform the following actions according to the judgment result: if the speed of the vehicle is less than or equal to the preset speed, the output module controls the parking brake device (30) to stop decelerating the vehicle.

3. A control method for an electronic parking brake system of a vehicle, comprising: During the driving of the vehicle, receiving state information that the parking brake triggering device is activated, and controlling the parking brake device to perform deceleration braking on the vehicle; and receiving the state information of the parking brake trigger device being released and the speed of the vehicle, and determining whether the speed of the vehicle is greater than a preset speed, and performing the following actions according to the determination result: if the speed is greater than the preset speed, controlling the parking brake device to perform deceleration braking on the vehicle until the speed of the vehicle is less than or equal to the preset speed, The control method further comprises: receiving status information of an accelerator pedal (50) of the vehicle, and if the accelerator pedal (50) is in an accelerating state, controlling the parking brake device (30) to stop decelerating the vehicle.

4. The control method according to claim 3, characterized in that: The control method further comprises executing the following actions according to the judgment result: if the speed of the vehicle is less than or equal to the preset speed, controlling the parking brake device (30) to stop decelerating the vehicle.

5. A computer-readable storage medium having program instructions stored thereon, wherein: When the program instructions are executed by a processor, the method according to any one of claims 3 to 4 can be implemented.

6. A control device for an electronic parking brake system of a vehicle, the control device comprising a memory and a processor, wherein the memory stores program instructions that can be run on the processor, wherein: When the processor executes the program instructions, the method according to any one of claims 3-4 can be implemented.

7. An electronic parking brake system for a vehicle, the electronic parking brake system comprising a control device (40) according to any one of claims 1 to 2.

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