Braking system, control method and vehicle

Abstract

The application discloses a kind of brake systems, including detection module, whole vehicle control module and execution module;The detection module is set to obtain the driving state information of vehicle, and its output is connected with the whole vehicle control module;The whole vehicle control module is set to process vehicle driving state information and determine whether to meet braking preset condition, and when meeting braking preset condition, control signal is sent to the execution module;The execution module is set to increase the wheel torque and braking force of vehicle according to the control signal of whole vehicle control module.The brake system of the application can actively increase pressure when the vehicle is sliding on a slope, increase the braking ability of the vehicle on a slope, and improve the safety of the vehicle.The application also discloses a control method of brake system and a vehicle.

Description

Technical Field

[0001] This invention belongs to the field of vehicle braking technology, specifically relating to a braking system, control method, and vehicle. Background Technology

[0002] With the rapid development and popularization of new energy vehicles, the vehicle weight has increased. As the slope increases, when a car brakes to stop on a slope, the load is transferred, making the load more concentrated on the wheels on the downhill side. Under the same braking pressure, the high-load wheels cannot lock up, resulting in the wheels' braking capacity not being fully utilized, and the vehicle rolling away.

[0003] Therefore, the vehicle ramp parking function in the existing technology needs to be further improved to meet higher safety requirements.

[0004] The goal is to provide an improved vehicle braking system. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a braking system designed to improve vehicle safety.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a braking system, including a detection module, a vehicle control module, and an execution module;

[0007] The detection module is configured to acquire the vehicle's driving status information, and its output is connected to the vehicle control module.

[0008] The vehicle control module is configured to process vehicle driving status information and determine whether the braking preset conditions are met, and to send a control signal to the execution module when the braking preset conditions are met.

[0009] The execution module is configured to increase the wheel torque and braking force of the vehicle according to the control signal from the vehicle control module.

[0010] The detection module includes a wheel speed sensor unit, which is configured to detect wheel speed information in real time.

[0011] The detection module also includes a brake pedal detection unit, which is configured to detect brake pedal information.

[0012] The detection module also includes a vehicle body IMU sensor unit, which is configured to detect the vehicle's driving status.

[0013] The braking preset conditions include the absolute value of the vehicle's longitudinal acceleration being greater than a threshold, the brake pedal opening being greater than a threshold, the wheel speeds of the two first wheels on a certain axle being 0 and in a locked state, and the wheel speed direction of the second wheel in a non-locked state being opposite to the direction of the vehicle's longitudinal acceleration.

[0014] After the braking preset conditions are met, the execution module controls the increase of torque and braking force of the second wheel that is in a non-locked state.

[0015] The present invention also provides a control method for a braking system, comprising:

[0016] The detection module acquires the vehicle's driving status information;

[0017] The vehicle control module processes vehicle driving status information and sends a control signal to the execution module after determining that the preset braking conditions are met.

[0018] The execution module controls the increase of wheel torque and braking force of the vehicle.

[0019] The braking preset conditions include the absolute value of the vehicle's longitudinal acceleration being greater than a threshold, the brake pedal opening being greater than a threshold, the wheel speeds of the two first wheels on a certain axle being 0 and in a locked state, and the wheel speed direction of the second wheel in a non-locked state being opposite to the direction of the vehicle's longitudinal acceleration.

[0020] After the braking preset conditions are met, the execution module controls the increase of torque and braking force of the second wheel that is in a non-locked state.

[0021] The present invention also provides a vehicle including the aforementioned braking system.

[0022] The braking system of the present invention can actively increase pressure when the vehicle rolls off a slope, thereby increasing the vehicle's braking ability on slopes and improving vehicle safety. Attached Figure Description

[0023] This manual includes the following figures, which illustrate the following:

[0024] Figure 1 This is a flowchart of the braking system control method of the present invention. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0026] In a first aspect, embodiments of the present invention provide a braking system, including a master cylinder, a detection module, a vehicle control module, and an execution module.

[0027] Specifically, the detection module is configured to acquire the vehicle's driving status information, and its output is connected to the vehicle control module; the vehicle control module is configured to process the vehicle's driving status information and determine whether the braking preset conditions are met, and to send a control signal to the execution module when the braking preset conditions are met; the execution module is configured to increase the vehicle's wheel torque and braking force according to the control signal from the vehicle control module.

[0028] In this embodiment of the invention, the detection module includes a wheel speed sensor unit, which is configured to detect wheel speed information in real time and is connected to the vehicle control module.

[0029] In this embodiment of the invention, the detection module further includes a brake pedal detection unit, which is configured to detect brake pedal information, including the opening degree of the brake pedal, and the brake pedal detection unit is connected to the vehicle control module.

[0030] In this embodiment of the invention, the detection module further includes a vehicle body IMU (Inertial Measurement Unit) sensor unit, which is configured to detect the vehicle's driving status information, including the vehicle body's longitudinal acceleration. The IMU sensor unit is connected to the vehicle control module.

[0031] In this embodiment of the invention, the detection module further includes a pressure sensor, which is used to detect the pressure of the brake master cylinder and is connected to the vehicle control module.

[0032] In this embodiment of the invention, the braking preset conditions include the absolute value of the longitudinal acceleration of the vehicle body being greater than a threshold, the brake pedal opening being greater than a threshold, the wheel speed of the two first wheels on a certain axle being 0 and in a locked state, and the wheel speed direction of the second wheel in a non-locked state being opposite to the longitudinal acceleration direction of the vehicle body.

[0033] In this embodiment of the invention, for a vehicle with four wheels, the two first wheels are the front wheels, and the two second wheels are the rear wheels. The vehicle control module receives information from the detection module, determines whether the vehicle has met the preset braking conditions, and transmits the rear wheel control information to the execution module. The execution module mainly brakes the master cylinder and the wheel-end brakes located at the wheels, which are used to apply braking force to the wheels.

[0034] After the preset braking conditions are met, the execution module controls the increase of torque and braking force on the second wheel, which is in a non-locked state, until the wheel speed of the second wheel reaches 0, causing all wheels of the vehicle to lock up. By increasing the torque of the non-locked wheels to suppress backward slippage and increasing the braking force of the non-locked wheels, the execution module locks all four wheels of the vehicle, thereby increasing the vehicle's braking ability on slopes.

[0035] Secondly, such as Figure 1 As shown, this embodiment of the invention also provides a control method for a braking system, comprising the following steps:

[0036] S1. The detection module acquires the vehicle's driving status information;

[0037] S2. The vehicle control module processes vehicle driving status information and sends a control signal to the execution module after determining that the preset braking conditions are met.

[0038] S3, the execution module controls and increases the wheel torque and braking force of the vehicle.

[0039] In this embodiment of the invention, in step S2 above, the braking preset conditions include the absolute value of the longitudinal acceleration of the vehicle body being greater than a threshold, the brake pedal opening being greater than a threshold, the wheel speed of the two first wheels on a certain axle being 0 and in a locked state, and the wheel speed direction of the second wheel in a non-locked state being opposite to the longitudinal acceleration direction of the vehicle body (it is stipulated that when the vehicle goes uphill and stops, the longitudinal acceleration measured by the IMU is positive, which reflects that the vehicle is subjected to the component of gravity downhill along the slope, and the wheel speed measured by the wheel speed sensor in the forward direction is positive).

[0040] In step S3 above, after the vehicle control module determines that the vehicle meets the preset braking conditions, it transmits the rear wheel control information to the execution module. After the preset braking conditions are met, the execution module controls the increase of torque and braking force of the second wheel, which is in a non-locked state, until the wheel speed of the second wheel is 0.

[0041] like Figure 1 As shown, the vehicle control module receives signals from various sensors to determine the vehicle's status.

[0042] When the vehicle brakes:

[0043] The vehicle control module determines the driver's braking intention, calculates the current road slope, and calculates the braking pressure required to lock the wheels based on signals transmitted from the IMU sensor unit, wheel speed sensor unit, brake pedal detection unit, etc.

[0044] When the vehicle comes to a complete stop, and the wheel speed of the first wheel on a certain axle is 0:

[0045] Based on the pressure information of the brake master cylinder detected by the pressure sensor and the wheel-end lock-up pressure on the ramp, it is determined whether the current pressure can guarantee four-wheel lock-up, and the torque and braking force of the second wheel that is in a non-lock-up state are actively increased.

[0046] When a vehicle rolls down a slope:

[0047] If the direction of the wheel speed of the second wheel in a non-locked state is opposite to the direction of the longitudinal acceleration of the vehicle body, and the brake pedal is depressed and the brake pedal opening is greater than the threshold, then it is determined that the vehicle is rolling backward. The torque of the non-locked second wheel needs to be increased to suppress the vehicle rolling backward, and the braking force of the non-locked second wheel should be continuously increased until the wheel speed of the non-locked second wheel is 0.

[0048] The present invention also provides a vehicle including the braking system described above. Since the vehicle of the present invention includes the braking system of the above embodiments, it possesses all the advantages of the described braking system.

[0049] The complete vehicle and the vehicle of the present invention are new energy vehicles, including but not limited to passenger cars and commercial vehicles.

[0050] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A braking system, characterized in that, It includes a detection module, a vehicle control module, and an execution module; The detection module is configured to acquire the vehicle's driving status information, and its output is connected to the vehicle control module. The vehicle control module is configured to process vehicle driving status information and determine whether the braking preset conditions are met, and to send a control signal to the execution module when the braking preset conditions are met. The execution module is configured to increase the wheel torque and braking force of the vehicle according to the control signal from the vehicle control module. The braking preset conditions include the absolute value of the vehicle's longitudinal acceleration being greater than a threshold, the brake pedal opening being greater than a threshold, the wheel speeds of the two first wheels on a certain axle being 0 and in a locked state, and the wheel speed direction of the second wheel in a non-locked state being opposite to the direction of the vehicle's longitudinal acceleration.

2. The braking system according to claim 1, characterized in that, The detection module includes a wheel speed sensor unit, which is configured to detect wheel speed information in real time.

3. The braking system according to claim 2, characterized in that, The detection module also includes a brake pedal detection unit, which is configured to detect brake pedal information.

4. The braking system according to claim 3, characterized in that, The detection module also includes a vehicle body IMU sensor unit, which is configured to detect the vehicle's driving status.

5. The braking system according to any one of claims 1 to 4, characterized in that, After the braking preset conditions are met, the execution module controls the increase of torque and braking force of the second wheel that is in a non-locked state.

6. The control method for the braking system as described in any one of claims 1 to 5, characterized in that, include: The detection module acquires the vehicle's driving status information; The vehicle control module processes vehicle driving status information and sends a control signal to the execution module after determining that the preset braking conditions are met. The execution module controls the increase of wheel torque and braking force of the vehicle.

7. The control method for the braking system according to claim 6, characterized in that, The braking preset conditions include the absolute value of the vehicle's longitudinal acceleration being greater than a threshold, the brake pedal opening being greater than a threshold, the wheel speeds of the two first wheels on a certain axle being 0 and in a locked state, and the wheel speed direction of the second wheel in a non-locked state being opposite to the direction of the vehicle's longitudinal acceleration.

8. The control method for the braking system according to claim 7, characterized in that, After the braking preset conditions are met, the execution module controls the increase of torque and braking force of the second wheel that is in a non-locked state.

9. A vehicle, characterized in that, Includes the braking system described in any one of claims 1 to 5.

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