Patent ID: 7386378

Claim:
A vehicle suspension system comprising: a cylinder; a rod inserted within said cylinder; a piston coupled to said rod; a piston valve coupled to said piston, wherein said piston valve has an input piston current (i p ); a base coupled to said cylinder; a base valve coupled to said base, wherein said base valve has an input base current (i b ); and a controller coupled to said piston valve and said base valve, said controller adapted to generate said input piston current and said input base current based on a generated virtual current (i v ); wherein said input piston current and said input base current are generated from said virtual current based substantially on the following equation: i b = { i - - i v ⁡ ( i + - i - ) i v < 0 i - i v > 0 ⁢ ⁢ i p = { i - i v < 0 i - + i v ⁡ ( i + - i - ) i v > 0 .