Fault-tolerant control method for car active front wheel steering system

A Technology of Active Front Wheel Steering and Fault-tolerant Control

Active Publication Date: 2019-08-16
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

When the car is turning at low speed, the active steering motor acts in the same direction as the driver turns the steering wheel, and the steering transmission ratio becomes smaller, which improves the sensitivity of the steering system; when the car is

Method used

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  • Fault-tolerant control method for car active front wheel steering system
  • Fault-tolerant control method for car active front wheel steering system
  • Fault-tolerant control method for car active front wheel steering system

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Embodiment Construction

[0060] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0061] Such as Figure 1-5 Shown, a kind of fault-tolerant control method of automobile active front wheel steering system, comprises the following steps:

[0062] Step 1. Based on the ideal vehicle dynamics model of the front wheel steering system, it is used as a reference model during the operation of the vehicle to output the actual motion state information of the vehicle, including the vehicle lateral velocity, yaw rate, center of mass side slip angle and lateral tire force;

[0063] The specific construction process of the ideal vehicle front wheel steering system dynamics model is as follows:

[0064] Construct a dynamic model of the vehicle steering system:

[0065]

[0066] where v x and v y Respectively represent the longitudinal velocity and lateral ve...

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Abstract

The invention discloses a fault-tolerant control method for a car active front wheel steering system. The fault-tolerant control method comprises the followi.kng steps that first, based on an ideal car front wheel steering system dynamic model, the ideal car front wheel steering system dynamic model is taken as a reference model in the car operation process and used for outputting actual motion state information, including the car transverse speed, the yaw angle speed, the centroid side slip angle and transverse tire force, of a car; and second, the mass of the car is changed with the number of passengers, the value of the mass of the car is fluctuated in a certain range, and thus uncertain parameters existing in the car model are processed through a Takagi-Sugeno method, namely a T-S fuzzy method. The fault-tolerant control method has the advantages of being simple in structure, small in operation amount, convenient to implement and the like; and through combination of front wheel steering angle control and yaw moment control, the control effect of the fault-tolerant control method is superior to a control method in a single mode, through compound control, on the one hand, the good steering angle precision can be ensured, and on the other hand, the good control effect can be obtained.

Description

technical field [0001] The invention relates to the technical field of automobile active front wheel steering control, in particular to a fault-tolerant control method of an automobile active front wheel steering system. Background technique [0002] Automobile steering system is an important subsystem of the overall structure of the automobile. Its handling performance directly affects the safety, stability, sensitivity and driving comfort of the automobile. With the continuous development of modern technology and vehicle control theory, people have higher and higher requirements for the overall performance of vehicles. In terms of active safety and handling stability of automobiles, the active steering system of automobiles plays a key role in improving the overall performance of automobiles. [0003] In the traditional automobile steering system, the transmission ratio is fixed when the automobile turns, and the safety and stability of the automobile are poor. When the ...

Claims

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Application Information

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IPC IPC(8): B60W30/045B60R16/023
CPCB60R16/0231B60W30/045
Inventor 李鸿一陈林周琪李攀硕任鸿儒
Owner GUANGDONG UNIV OF TECH
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