Method for adjusting and controlling vehicle height of electrical control air suspension

Abstract

The invention provides a method for adjusting and controlling the vehicle height of an electrical control air suspension. The method includes the steps that a vehicle body height sensor is used for obtaining a vehicle body height real-time signal, filtering the vehicle body height real-time signal and transmitting the vehicle body height real-time signal to a vehicle height adjusting and controlling unit; the vehicle height adjusting and controlling unit compares the current vehicle body height signal with a target vehicle body height signal and outputs a control signal according to a preset hysteretic interval and vehicle height adjusting and controlling strategies; the control signal is used for directly controlling the on-off states of a solenoid valve related to vehicle height adjustment, so that control over the quality and flow of gas flowing into or flowing out of an air spring is achieved. According to the method, the vehicle body height of the electrical control air suspension can be effectively adjusted, frequent switching of the on-off states of the solenoid valve can be prevented, the service life of the solenoid valve is prolonged, and the energy consumption of a system is reduced.

Description

technical field [0001] The invention belongs to the field of vehicles, and in particular relates to an electronically controlled air suspension vehicle height adjustment control method. Background technique [0002] Under different driving conditions, the vehicle has different control requirements for the height of the vehicle body. For example, when the vehicle is running at high speed, by lowering the height of the vehicle body, lowering the center of gravity of the chassis, improving the stability of the vehicle at high speed, reducing wind resistance and fuel consumption; When driving on rough roads, by raising the height of the vehicle body, the probability of suspension hitting the limit is reduced, and the vehicle's driving performance is improved. In addition, differences in vehicle loads can cause the ride height to deviate from the ideal ride height. [0003] The electronically controlled air suspension can charge and deflate the air spring to realize the effectiv...

AI Technical Summary

Problems solved by technology

The inflation and deflation of the air spring is controlled by the solenoid valve, but due to the large air inlet and outlet of the solenoid valve, no matter how sensitive the solenoid valve is, there will be excessive gas charged into the air spring or released from the air spring, thus Cause the vehicle height to deviate from the desired target height, which in turn causes the vehicle height to oscillate during the adjustment process

[0004] Chinese patent application CN201310661137.7 discloses a method of adjusting the height of the vehicle body through a height sensor, and the set value is given as the comparison object of the current vehicle height value. "Overcharge" and "overdischarge" phenomena occur, and the vehicle body height will oscillate near the set value, which will lead to frequent switching of the on-off state of the solenoid valve, reducing the service life of the solenoid valve and consuming a lot of energy

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