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Four wheel independent steering drive-by-wire vehicle-based emergency braking control method

A four-wheel independent steering and emergency braking technology, which is applied to the deflectable wheel steering mechanism, steering mechanism, vehicle components, etc., can solve the problems of not fully utilizing the four-wheel independent drive, shorten the braking distance, and improve stability performance, improve the effect of braking deceleration

Inactive Publication Date: 2018-07-06
ZHAOQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not give full play to the advantages of the independent steering operation of the 4-wheel independent drive / steering-by-wire vehicle, and does not actively control the rotation angle of the wheel where the brake fails and the other three wheels to assist the braking of the whole vehicle

Method used

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  • Four wheel independent steering drive-by-wire vehicle-based emergency braking control method
  • Four wheel independent steering drive-by-wire vehicle-based emergency braking control method
  • Four wheel independent steering drive-by-wire vehicle-based emergency braking control method

Examples

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Effect test

Embodiment Construction

[0035] Such as figure 1 , 2 , Shown in 3, a kind of emergency brake control method based on four-wheel independent steering drive-by-wire car, comprises the following steps:

[0036] Step 1, the lidar, pressure sensor, and angle sensor respectively collect lidar data, brake pressure data, and angle data signals, and then send them to the data processing module for processing;

[0037] Step 2, the signal processed by the data processing module is input to the central processing unit, and based on the data returned by the lidar, the clustering feature extraction algorithm is used to identify effective targets in the own lane, and the relative distance and relative speed of these targets to the own vehicle are calculated and obtained , and at the same time input the real-time collected sensor signals to the road adhesion estimation model to estimate the road adhesion in real time;

[0038] Step 3, the central processing unit calculates the safety warning distance and the safety...

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Abstract

The invention discloses a four wheel independent steering drive-by-wire vehicle-based emergency braking control method. The four wheel independent steering drive-by-wire vehicle-based emergency braking control method aims at making full use of the advantages of a four wheel independent steering / driving vehicle, and by exerting a small coaxial different-directional steering angle on two wheels on the same axle under emergency braking conditions, can improve the braking deceleration of the vehicle to the maximum degree to shorten the braking length and improve the vehicle safety. Besides, according to the four wheel independent steering drive-by-wire vehicle-based emergency braking control method, the additional steering angle is exerted onto the wheels, the wheels on both sides of the vehicle can produce lateral forces identical in size and opposite in direction, and the lateral forces can improve stability of the vehicle during a braking process; also, when the braking system of one wheel of the four wheel independent steering / driving vehicle breaks down or loses efficacy due to software failure or hardware failure, by exerting active control on the steering angle of the braking failed wheel and matching with active braking and steer angle control of the other three wheels, the vehicle can avoid stability loss such as sharp steering and achieve stable braking.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an emergency braking control method for a drive-by-wire automobile based on four-wheel independent steering. Background technique [0002] The four-wheel independent steering / drive-by-wire vehicle eliminates mechanical components such as reducers and differentials, thus reducing the cost and noise of the vehicle; the electronic control can also greatly improve the response speed of the system; the braking energy recovery system is used to reduce energy consumption ; And the most important thing is the four-wheel independent steering function, which can greatly improve the high-speed stability and low-speed flexibility of the car. Due to the many advantages of four-wheel independent steering / drive-by-wire vehicles, it has been widely recognized by academia and industry, and is considered to be an ideal model for future smart electric vehicles. [0003] However, due to the com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D9/00B60W30/02B60W30/045B60W10/18B60W10/20
CPCB60W10/18B60W10/20B60W30/02B60W30/045B62D9/007
Inventor 张东王慧文宗长富蔡超明
Owner ZHAOQING UNIV
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