A multi-mode switching control method for electronically controlled air suspension body height

Abstract

The invention provides a multimode switching control method for body height of an electronic-control air suspension. The method includes defining the body height as three modes including 'body high position', 'body middle position' and 'body low position', utilizing a vehicle speed sensor and a body height sensor to online extract related signals reflecting actual traveling conditions of a vehicle, and determining the height mode of the vehicle according to the above signals; adjusting target modes according to different body heights, adjusting related parameters of body height control models to form three different body height control models, and respectively designing body height PID (proportion integration differentiation) controllers with different control parameters on the basis of the body height control models; establishing a switching control unit, and selecting corresponding PID controllers according to different body height adjusting target modes to perform body height control by the switching control unit. According to difference, in body height control, caused by difference in the body height adjusting target modes, targeted PID controllers are adopted for controlling respectively, so that body height control can be more accurate and more efficient.

Description

technical field [0001] The invention relates to a vehicle body height control method of an electronically controlled air suspension, in particular to adopting vehicle body height PID controllers with different control parameters for vehicle body height switching control for different vehicle body height adjustment target modes. Background technique [0002] Under different driving conditions, the vehicle has different requirements for the height of the vehicle body. For example, when the vehicle is running at high speed, the performance of the vehicle on the ground can be improved by reducing the height of the vehicle body. It can also reduce wind resistance and fuel consumption while improving the stability of the vehicle at high speed; When the vehicle is driving on a rough road at a low speed, by raising the height of the vehicle body, the probability of the suspension hitting the limit can be reduced and the vehicle's driving performance can be improved. Due to the limit...

AI Technical Summary

Problems solved by technology

[0005] PID control is easy to implement in engineering and has been widely used in practice. However, once the traditional PID control parameters are determined, they cannot be changed. Therefore, when the system characteristics change, the control effect will be reduced.

In recent years, PID control parameter self-tuning technology has been developed rapidly, but the application effect of model-based PID parameter self-tuning is still unsatisfactory. Although other intelligent technologies such as fuzzy reasoning can be used to realize the self-tuning of PID control parameters, the system implementation is relatively difficult. Complicated and increases control costs

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