Hydraulic semi-active suspension for special vehicle and control method thereof

Abstract

The invention discloses a hydraulic semi-active suspension for a special vehicle and a control system thereof. The hydraulic semi-active suspension is composed of a hydraulic motor, a generator, a storage battery, a DC module, four sets of energy feedback adjusting valve units and four sets of shock absorber hydraulic cylinders, and the automatic adjusting system is composed of a driving motor, ahydraulic pump, a hydraulic source oil tank, an oil filter, a low-pressure energy accumulator, a high-pressure energy accumulator, four sets of automatic adjusting valve units and four sets of shock absorber hydraulic cylinders. Eachh energy feedback adjusting valve unit consists of a switch valve and a one-way valve, and each automatic adjusting valve unit consists of a three-position four-way electromagnetic valve and an oil tank; the control method comprises an energy feedback control method and an active adjustment control method. The height of each suspension shock absorber can be adjusted according to different working conditions when emergency braking, rapid acceleration and steering are about to roll over, so that the vehicle smoothness, the operation stability and the driver safety are improved, and energy recovery is carried out when the vehicle runs linearly and stably.

Description

technical field [0001] The invention belongs to the technical field of automobile suspension, and in particular relates to a hydraulic semi-active suspension for special vehicles and a control method thereof. Background technique [0002] In the existing special vehicles, the chassis suspension adopts a leaf spring structure, and the height of the suspension cannot be adjusted when the suspension is balanced. During emergency braking or rapid acceleration, the special vehicle is too high, resulting in severe vehicle body pitching; and the special vehicle weighs It is very large and the inertia is also very large. The body rolls violently when turning, and may even cause rollover when turning on a road with a low adhesion coefficient, so that the ride comfort, handling stability and driver safety of the whole vehicle are reduced. [0003] At present, there are many height-adjustable suspension technologies used in cars and buses, mainly including height-adjustable air suspens...

AI Technical Summary

Problems solved by technology

[0004] The height-adjustable air suspension is mainly used in passenger cars and high-end cars, and the height can be adjusted through the ECU to control the airbag inflation and deflation according to different road conditions. However, because the air suspension has high requirements on the working environment, if it is installed on special vehicles , the replacement and maintenance frequency will be greatly increased, and the performance of the air suspension will be greatly reduced in off-road vehicles

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