Land vehicles – Wheeled – Running gear
Patent
1989-07-27
1991-04-02
Bertsch, Richard A.
Land vehicles
Wheeled
Running gear
188299, 280709, 36442401, B60G 1132, B60G 1700
Patent
active
050042645
ABSTRACT:
A position control device includes a fluid-operated directional control valve for controlling the position of the piston of a cylinder assembly under fluid pressure in response to a control signal from an electronic controller. The position of the piston is predicted based on the control signal. A position detector detects when the piston has actually reached a predetermined position. When it is detected that the piston has actually reached the predetermined position, the predicted position of the piston is corrected. The electronic controller applies a control signal to the directional control valve so that the predicted position as corrected will be equalized to a target position for the piston. The predetermined position is a substantially intermediate position of the stroke of the piston. The directional control valve comprises a solenoid-controlled valve for controlling the flow rate of the fluid depending on the magnitude of a current supplied to the solenoid-operated valve. The position of the piston is calculated based on the magnitude of the current and a period of time during which the current is supplied to the solenoid-operated valve. An automotive suspension system incorporating the position control device is also disclosed.
REFERENCES:
patent: 4616848 (1986-10-01), Sugasawa et al.
patent: 4621833 (1986-11-01), Soltis
patent: 4712807 (1987-12-01), Kurosawa
patent: 4829436 (1989-05-01), Kowalik et al.
patent: 4861066 (1989-08-01), Dernie
Hibino Katsuhiko
Ishikawa Hiroshi
Kozaki Tetsuji
Shimamoto Mamoru
Suzuki Motoshi
Bertsch Richard A.
Nippondenso Co. Ltd.
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