The switching control loop between the hydro-pneumatic suspension and the active suspension

Abstract

A oil-air suspension and active suspension switching control circuit and a suspension oil cylinder, first of all: the structure of the suspension oil cylinder is improved, that is, the outer cylinder wall of the suspension oil cylinder is provided with oil ports at the upper and lower sides, and the inner cylinder is built in the center through hole of the upper end cover. , the wall of the inner cylinder is provided with two oil ports respectively connected to the inner rodless cavity and the inner rod cavity, the end of the inner cylinder located in the outer cylinder is connected to the outer piston located in the outer cylinder, and the inner One end of the cylinder rod located in the inner cylinder is connected with the inner piston, and one end located in the outer cylinder is fixedly connected with the lower end cover. The present invention adds an active suspension control circuit to the existing interconnected oil-air suspension switching control circuit, which is based on the improved suspension oil cylinder, and adopts left and right servo valves and left and right oil-gas recovery control valves to cooperate with it. Through the active suspension control loop, three control modes of oil-air control, active control and rigidity control of the suspension system can be realized, and the three control modes can be switched mutually without affecting each other.

Description

technical field [0001] The invention relates to a vehicle suspension system. Background technique [0002] The suspension system is an important part of the vehicle chassis, which can not only support the frame, but also buffer the impact transmitted to the frame or body from uneven roads, and attenuate the vehicle vibration caused by the ground. The performance of the suspension system directly determines the ride comfort, handling stability and driving safety of the vehicle. [0003] Current vehicles, especially engineering vehicles, mostly adopt leaf spring suspension, oil-pneumatic suspension or air suspension. The stiffness characteristic of the leaf spring suspension is linear, and once the stiffness value is determined, it cannot be changed. When the road surface conditions change, it cannot meet the requirements of high driving comfort and handling stability. Oil-pneumatic suspension and air suspension have variable stiffness characteristics, which can improve the ...

AI Technical Summary

Problems solved by technology

[0004] The existing oil-gas suspension structure is mainly an interconnected oil-gas suspension structure, such as the publication number CN101618669A published in the Chinese patent on January 6, 2010. The invention name is "oil-air suspension control circuit, multi-axis vehicle oil-air suspension system and crane" Although it has many advantages, it also has some disadvantages: although the existing oil-pneumatic suspension can improve the ride comfort of the vehicle on uneven roads to a certain extent, the pressure of the accumulator cannot be adjusted when the vehicle is running. , the stiffness characteristics of the suspension can only be changed within a certain range, and its adjustment to complex road surfaces has great limitations; secondly, the interconnection of the oil-pneumatic suspension in a flexible state can improve the roll stiffness of the vehicle when it is running, but it is difficult for the vehicle to accelerate or The pitch adjustment during braking is helpless; in addition, this suspension system only has oil-air control mode, and there is no alternative solution, and its reliability is difficult to guarantee when the vehicle is driving for a long time

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