Pneumatic adjustable damping control valve

Abstract

The invention provides a pneumatic adjustable damping control valve. The pneumatic adjustable damping control valve comprises a hydraulic hysteresis module, a pneumatic module and a damping coefficient control module. When the automobile load changes, the hydraulic hysteresis module enables a low-speed piston, a pneumatic reset spring and a high-speed piston to move together, the suspension foundation damping coefficient is high when the automobile load is large, and the suspension foundation damping coefficient is low when the load is small. In the running process of an automobile, an automotive suspension is compressed and stretched repeatedly and rapidly, due to the hysteresis effect of the hydraulic hysteresis module, the position of the low-speed piston basically remains unchanged, and the high-speed piston can rapidly move along with the air pressure change. During compression, the high-speed piston moves away from a damper valve element, so that the damping coefficient is decreased; and during stretching, the high-speed piston approaches the damper valve element, so that the damping coefficient is increased. The foundation damping coefficient of a damper can be increased along with increase of the load, the damping coefficient is decreased when the suspension is compressed and the damping coefficient is increased when the suspension is stretched in the running process, and thus the automotive suspension design and application requirements are met.

Description

technical field [0001] The invention relates to the technical field of vehicle suspension, in particular to a pneumatically adjustable damping control valve installed in a shock absorbing strut of an air suspension with large load changes. Background technique [0002] Suspension is an important part of the vehicle chassis and has a great influence on the ride comfort of the vehicle. Due to the inherent defects of the traditional passive suspension, such as the suspension parameters (the stiffness of the elastic element and the damping coefficient of the damping element) cannot be adjusted once determined, it cannot well meet the requirements of ride comfort and handling stability in various situations . [0003] In 2013, in Jiangsu University's patent application number CN201310186653.9 "Pneumatic Adjustable Damping Coaxial Integrated Shock Protrusion", the author Chen Long proposed a pneumatic adjustable damping coaxial integrated shock absorber strut in the article, whic...

AI Technical Summary

Problems solved by technology

However, during the operation of the vehicle, when the air suspension is compressed, the damping coefficient becomes larger; when the air suspension is stretched, the damping coefficient becomes smaller, which does not meet the need for smaller damping in the compression process of the suspension. , while a larger damping requirement is required in the stretching process

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