Pressure control valve for active suspension control system

Fluid handling – Systems – Multi-way valve unit

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91433, F15B 13043

Patent

active

052614557

ABSTRACT:
A pressure control valve for adjusting a controlled pressure supplied to an actuator includes first and second valves. The first valve serves to modify a pressure level of a working fluid supplied from a fluid pressure source to a preselected level and provides it to the actuator. The second valve is responsive to a control signal commanding elevation or reduction in the controlled pressure from a controller to adjust a supply pressure level from the fluid pressure source to provide a pilot pressure, elevated or reduced to a preselected level, to the first valve for activating same. When elevating or reducing the pilot pressure, the second valve decreases the supply pressure level from the fluid pressure source by a preselected degree, for balancing a flow gain when elevating the pilot pressure with that when reducing the pilot pressure, for providing uniform response for elevation and reduction of the controlled pressure to the actuator.

REFERENCES:
patent: 3286734 (1966-11-01), Hartshorne
patent: 4527592 (1985-07-01), Dotti et al.
patent: 4615358 (1986-10-01), Hammond et al.
patent: 5031663 (1991-07-01), Fukuta et al.
patent: 5042832 (1991-08-01), Takahashi et al.
patent: 5048861 (1991-09-01), Takahashi

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