A vehicle height control method for electronically controlled air suspension with layered architecture

Abstract

The invention provides a whole-vehicle height control method based on an electric-control air hanging bracket adopting a layered structure. The method comprises a whole-vehicle height control strategy for an upper layer, and a height tracking control strategy for a bottom layer. In the whole-vehicle height control strategy, the vehicle running condition is recognized according to information of the vehicle speed, the height of a vehicle body and the like, and the target height is decided. In the height tracking control strategy, a PD controller is adopted to track the target height of the vehicle body according to the difference value of the actual height of the vehicle body and the target height, and the set hysteretic range. The planimetric position of the vehicle body is calculated by utilizing the height information acquired by a vehicle-body height sensor, and then, the actual height of the vehicle body, at each air spring, is obtained through calculation. According to the control method disclosed by the invention, the corresponding vehicle-body height control strategy can be adopted according to the running condition of the vehicle, so that the phenomena of over-charging, over-discharging and oscillation, which occur during the adjustment of the height of the vehicle body, are avoided; besides, when the height of each air spring is adjusted during the adjustment of the height of the vehicle body, the control of the vehicle body posture of the whole vehicle is also taken into consideration.

Description

technical field [0001] The invention relates to the technical field of automobile suspension systems, in particular to a method for controlling the vehicle height of an electronically controlled air suspension with a layered structure. Background technique [0002] With the development of science and technology and the improvement of people's living standards, people pay more and more attention to the reliability and comfort of automobile suspension system. The leaf spring suspension widely used in commercial vehicles has fixed stiffness and damping, and cannot adjust the height of the vehicle body. It has been difficult to meet people's needs for riding comfort, safety, energy saving and environmental protection of commercial vehicles. Conventional mechanical air suspension systems have low reliability, few functions, and large consumption of compressed air. The electronically controlled air suspension system can adopt a corresponding body height control strategy according...

AI Technical Summary

Problems solved by technology

However, the driving conditions of the vehicle are complex and changeable, which increases the complexity of the electronically controlled air suspension control system

At the same time, due to the compressibility of the gas, it is very easy to overcharge and over-discharge the air spring when it is charged and deflated, which affects the control effect of the electronically controlled air suspension.

In addition, when the height of each air spring is individually controlled, due to the difference in the height adjustment rate of each air spring, the body posture during the height adjustment process of the vehicle body will be affected, which is not conducive to the comfort of the vehicle.

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