Patent ID: 7487973

Claim:
A multi-channel active roll control system for a vehicle suspension comprising: a two stage four way two position pilot actuated spool valve, having a first input port of a first stage adapted to be connected to a source of pressurized fluid and a second input port of said first stage adapted to be connected to a fluid reservoir; a valve body; a pressure reduction stage disposed within said valve body and having an input adapted to be connected to said source of pressurized fluid and an output connected to a first input port of a second stage of said spool valve, said second stage of said spool valve also having a second input port adapted to be connected to said fluid reservoir, with said first stage of said spool valve having a pair of output ports that define a first channel having a first operating pressure and said second stage of said spool valve having a pair of output ports that define a second channel having a second operating pressure that is less than said first operating pressure; and a controller operative to control a supply of pilot fluid to said spool valve, wherein said spool valve has a pilot port for receiving pressurized fluid for moving a valve spool disposed within said spool valve and further wherein said pilot port is connected to a pair of digital solenoid valves that are operable to selectively apply pressurized fluid to said spool valve pilot port and further wherein said solenoid valves have solenoids electrically connected to said controller, said controller being operative to selectively actuate said solenoids.