An intelligent fuzzy hybrid shed semi-active control method for vehicle suspension system

Abstract

The invention relates to a semi-active control method of an intelligent fuzzy mixed hook for a vehicle suspension system. The semi-active control method specifically comprises the steps that an acceleration signal X-diaeresis of the unsprung mass and an acceleration signal X-diaeresis<s> of the sprung mass are measured; the measured acceleration signals are integrated correspondingly, and thusthe corresponding vibration speeds of X-dot and X-dot<s> are obtained; skyhook damping force F<sky> and groundhook damping force F<ground> are obtained through a skyhook control method and a groundhook control method; the obtained skyhook damping force F<sky> and groundhook damping force F<ground> are subjected to weighted sum, and mixed hook damping force F is obtained, wherein the weighting coefficients of the mixed hook damping force F are alpha and 1-alpha correspondingly; the skyhook damping weighting coefficient alpha is subjected to dynamic matching through fuzzy control; and duringfuzzy control, two input interfaces input an error [X-dot<s> / |X-dot<s>|+|beta*X-dot|]-1 / 2 and an error changing rate [X-diaeresis<s> / |X-diaeresis<s>|+|gamma*X-diaeresis|]-1 / 2 correspondingly, and the skyhook damping weighting coefficient alpha is output. According to the control method, the speeds and the acceleration of the sprung mass and the unsprung mass are subjected to full domain control through only one fuzzy controller, the optimal absorber damping force can be matched, the structure is simple, and control precision is high.

Description

technical field [0001] The invention belongs to the field of vehicle vibration control, in particular to an intelligent fuzzy hybrid semi-active control method for a vehicle suspension system. Background technique [0002] When the car is running, the suspension will transmit all the forces between the wheels and the body, and its performance directly affects the ride comfort, handling stability and driving safety of the vehicle. Because the suspension stiffness and damping coefficient of the traditional passive suspension system cannot be adjusted automatically in real time, it seriously restricts the improvement space of its ride comfort and handling stability. There is an urgent need for a suspension with high control precision and simple structure in the development of the whole vehicle. rack system. [0003] Currently, the control methods used for vehicle suspension mainly include: skyhook control, groundhook control, LQG control, H-infinity optimal control, sliding mo...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the input interface of the fuzzy controller, only one performance index can be controlled, and it is sensitive to the range of the input quantity

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