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Active fault-tolerant control method for electric control suspension system of whole vehicle

A suspension system and fault-tolerant control technology, applied in the direction of suspension, elastic suspension, vehicle components, etc., can solve the problems of reduced reliability of suspension, reduced service life, and performance deterioration, so as to achieve good application value and improve accuracy performance, stable and reliable operation

Pending Publication Date: 2021-10-01
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electronically controlled suspension, the control system needs to drive the actuator to control the suspension characteristics according to the vehicle state collected by the sensor (refer to ZL2021104801808), and when the sensor or actuator or even the controller fails, the suspension will The working reliability is reduced and the performance is deteriorated, and even its service life is reduced

Method used

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  • Active fault-tolerant control method for electric control suspension system of whole vehicle
  • Active fault-tolerant control method for electric control suspension system of whole vehicle
  • Active fault-tolerant control method for electric control suspension system of whole vehicle

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Embodiment Construction

[0077] In this embodiment, an active fault-tolerant control method of an electronically controlled suspension of a vehicle, such as figure 1 As shown, it is carried out as follows:

[0078] Step 1: Establish the dynamic model of the electronically controlled suspension system of the vehicle;

[0079] Step 1.1: If figure 2 Shown is the model of the electronically controlled suspension system with seven degrees of freedom of the vehicle, and the seven degrees of freedom are the vertical displacements of the four wheels (z us1 ,z us2 ,z us3 ,z us4 ), the vertical motion displacement of the body z g , the pitch angle β of the body and the roll angle α of the body. For the convenience of description, define seven degrees of freedom z us1 ,z us2 ,z us3 ,z us4 ,z g , β, α are the generalized coordinates, the vertical displacement of the sprung mass z s1 ,z s2 ,z s3 ,z s4 As the redundant coordinates, the relationship between the vertical displacement of the sprung mas...

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Abstract

The invention discloses an active fault-tolerant control method for an electric control suspension system of a whole vehicle. The method is based on fault diagnosis and fault-tolerant control technologies, is applied to a general electric control suspension system, and comprises the following steps: (1) establishing a kinetic model of the electric control suspension system of the whole vehicle; (2) performing active fault-tolerant control when a sensor system fails; (3) adopting a hybrid control strategy of an electric control suspension controller considering vehicle driving smoothness and handling stability; (4) judging whether an actuator and the controller of an electric control suspension system break down at the same time; (5) giving an alarm when the controller breaks down; and (6) performing active fault-tolerant control when the actuator breaks down. According to the invention, active fault-tolerant control can be realized when the sensor, the actuator and the controller in the electric control suspension of the whole vehicle fail, so that the reliability of an electric control suspension system of a vehicle provided with the electric control suspension can be effectively enhanced, and switching of riding comfort and handling stability can be completed according to actual needs.

Description

technical field [0001] The invention designs the field of vehicle chassis suspension control, and specifically relates to a fault diagnosis and active fault-tolerant control method when a sensor, an actuator, and a controller in an electronically controlled suspension fail. Background technique [0002] The suspension system is an important structural component that connects the body and the wheels of the car. Its main function is to buffer and attenuate the impact load generated by the road surface, so as to suppress the beating of the wheels and reduce the irregular vibration of the body, and improve and enhance the driving of the vehicle. ride comfort and handling stability. [0003] From the perspective of controllability, automobile suspension can be divided into passive suspension, semi-active suspension (refer to ZL202010233226.1) and active suspension. Since the stiffness and damping of passive suspension cannot be adjusted, it is difficult to take into account the r...

Claims

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Application Information

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IPC IPC(8): B60G17/0185B60G17/018B60G17/015
CPCB60G17/0185B60G17/0182B60G17/0157B60G2600/08
Inventor 白先旭吕壮壮彭利明李维汉
Owner HEFEI UNIV OF TECH
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