Patent ID: 7240754

Claim:
A method for improving damping performance of a truck cab suspension comprising the steps of: providing a frame and a cab, said cab having a front portion pivotally mounted to said frame and a rear portion; providing at least one controlled actuator between said rear portion of said cab and said frame for controlling movement of said rear portion of said cab relative to said frame, said at least one controlled actuator being controlled by an augmented control signal based on a first control signal and a second control signal; providing at least one rear sensor for measuring movement of said rear portion of said cab relative to said frame, said at least one rear sensor generating a first movement signal; converting said first movement signal into a first velocity signal; generating said first control signal based on said first velocity signal; providing at least one front sensor for measuring movement of said front portion of said cab relative to said frame, said at least one front sensor generating a second movement signal; converting said second movement signal into a second velocity signal; generating said second control signal based on said second velocity signal; determining whether said first velocity signal is in phase with said second velocity signal; and generating said augmented control signal by either increasing said first control signal by said second control signal when said determining step determines that said first velocity signal is not in phase with said second velocity signal or decreasing said first control signal by said second control signal when said determining step determines that said first velocity signal is in phase with said second velocity signal.