Fuzzy sliding mode control method for vehicle height adjustment and vehicle attitude of electrically controlled air suspension

Abstract

The invention provides a fuzzy sliding mode control method for vehicle height adjustment and vehicle attitude of an electrically controlled air suspension. The method comprises the steps that vehiclebody height signals at four corners of the vehicle and signals at a pitch angle of the vehicle body and a side angle of the vehicle body reflecting the attitude of the whole vehicle are obtained by avehicle body height sensor and a gyroscope correspondingly; the signals at the pitch angle of the vehicle body and the side angle of the vehicle body and the vehicle body after a low-pass filter are transmitted to a fuzzy sliding mode controller of the vehicle; according to the difference between a actual value of a related signal and a target value and a predetermined fuzzy sliding mode control law, the controller outputs an air mass flow signal flowing through four high-speed switching solenoid valves; through the PWM pulse width modulation technology, the air mass flow signal is further transformed into a duty cycle signal of the four high-speed switching solenoid valves in an on-off state; and at last, the on-off states of an inflatable solenoid valve and a out-gassing solenoid valve is determined according to the on-off signal of the four high speed switching solenoid valves and the predetermined logical relationship. The effective adjustment towards the vehicle body height of theelectrically controlled air suspension is achieved, and the controller has strong adaptive ability, stable performance and remarkable advantage.

Description

technical field [0001] The invention relates to a vehicle height adjustment and vehicle attitude fuzzy sliding mode control method of an electronically controlled air suspension, in particular to controlling a vehicle height adjustment system of an electronically controlled air suspension by using a fuzzy sliding mode control technology. Background technique [0002] Electronically controlled air suspension can realize the active adjustment of suspension system stiffness, damping and body height, which is of great significance for improving the ride comfort, handling stability and fuel economy of the vehicle during driving. Research hotspots. Among them, the height adjustment of the vehicle body is one of the characteristic functions of the electronically controlled air suspension. The system realizes the active control of the vehicle body height by charging and deflating the air spring, which provides an important technical guarantee for the improvement of the comprehensive ...

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Problems solved by technology

[0003] However, due to the complex dynamic characteristics of the electronically controlled air suspension vehicle height adjustment system, such as the nonlinear mechanical behavior of the air spring, the nonlinear airflow characteristics of the solenoid valve, and the uncertainty of system parameters, conventional control methods are often difficult to achieve satisfactory control effects.

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