Hydraulic suspension system for a vehicle with less abrupt chang

Details Hydraulic suspension system for a vehicle with less abrupt chang Hydraulic suspension system for a vehicle with less abrupt chang

1989-12-01

1990-11-27

Bertsch, Richard A.

Land vehicles

Wheeled

Running gear

280709, 280714, 280840, B60G 1126

Patent

active

049730800

ABSTRACT:
In a hydraulic suspension system, a plurality of actuators having working fluid chambers are provided. Each actuator is adapted to increase and decrease vehicle height as the results of the supply and the discharge of working fluid to and from its working fluid chamber, respectively. Working fluid supply passages supply working fluid at supply pressure to the working fluid chambers and working fluid discharge passages discharge working fluid from the working fluid chambers. Cut-off valves and pressure control devices are provided in the supply passages and the discharge passages. Each cut-off valve is adapted to remain in its closed position whenever the supply pressure is not more than a predetermined value. Each pressure control device is adapted to control the supply of the working fluid to and the discharge from the associated working fluid chamber to adjust the pressure within the chamber. The system further comprises devices for detecting the pressures within the working fluid chambers and a device for determining the supply pressure. The pressure control devices are controlled so that their controlling pressures may substantially be equal to the pressures within the associated working fluid chambers determined by the pressure determining devices at least until the cut-off valves are opened.

REFERENCES:
patent: 4630527 (1986-12-01), Quin
patent: 4659104 (1987-04-01), Tanaka et al.
patent: 4869528 (1989-09-01), Buma et al.
patent: 4877263 (1989-10-01), Konishi et al.
patent: 4887840 (1989-12-01), Harara et al.

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