Oil-gas suspension with volume-variable additional gas chamber and control method of oil-gas suspension

Abstract

The invention belongs to the technical field of automotive suspensions and provides an oil-gas suspension with a volume-variable additional gas chamber and a control method of the oil-gas suspension. The oil-gas suspension comprises a detection mechanism, an execution mechanism, the additional gas chamber, an additional hydraulic cylinder, an oil-gas suspension body, an oil tank and an electronic control unit. By detecting the vehicle speed, the vehicle body vertical acceleration, the vehicle transverse acceleration and liquid pressure signals of a lower cavity of the additional gas chamber and a high-pressure oil storage tank, the electronic control unit achieves adjustment of the pressure of hydraulic oil in the additional gas chamber by controlling the execution mechanism; and high-pressure hydraulic oil is generated by the additional hydraulic cylinder through energy generated during vibration of a vehicle, so that pressure of nitrogen in the additional gas chamber is adjusted, and accordingly the rigidity of the oil-gas suspension body is adjusted. The additional hydraulic cylinder can achieve the functions of a shock absorber, and meanwhile energy waste is reduced. According to the oil-gas suspension with the volume-variable additional gas chamber and the control method of the oil-gas suspension, the rigidity adjustment range is wide; and meanwhile, due to the fact that throttling holes have a damping function, the smoothness of the vehicle is better, and the riding comfort is improved advantageously.

Description

technical field [0001] The invention belongs to the technical field of automobile suspension devices, and in particular relates to an oil-pneumatic suspension with a variable-volume additional air chamber and a control method thereof. Background technique [0002] In recent years, active oil-pneumatic suspensions have been used on some high-end cars. Active oil-pneumatic suspensions are new types of automotive suspensions that can automatically adjust the stiffness and height of suspension elastic elements. It has oil pumps that provide high-pressure oil to oil-pneumatic springs. The wheels have oil-pneumatic springs that can be individually adjusted, and are controlled by an electronic control system, which can well improve the ride comfort and handling stability of the car. At present, oil-pneumatic suspensions generally use multi-stage accumulators or additional high-pressure tanks to adjust the stiffness, but the stiffness is adjusted to a fixed value and the adjustment ...

AI Technical Summary

Problems solved by technology

[0003] The additional air chamber is generally used in the air suspension, which can adjust the stiffness and damping. The research on the volume-variable additional air chamber widens the adjustment range of the air suspension stiffness, so that the car can better adapt to different road excitations. Improve the ride comfort of the car; the application number is 201210075510.6, a variable-volume air spring additional air chamber, the invention of the additional air chamber realizes the volume change by controlling the reciprocating motion of the piston, so that the effective volume of the air spring participating in the work changes, In order to change the stiffness of the air spring system to adapt to various driving conditions of the vehicle and improve the overall performance of the suspension system, the piston of this invention must have good sealing performance; a variable volume with application number 201210544878.2 The additional air chamber of the air spring, the invention works by controlling the stepping motor, every time the central shaft rotates through a certain angle, different fan-shaped valve plates are driven to close the corresponding fan-shaped through holes, and the volume of the additional air chamber is automatically and rapidly changed, so that the air The spring obtains a large stiffness variation range, but this patent also requires good sealing, and the stepping motor needs energy consumption

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