Patent ID: 7085636
Filing Date: 2006-08-01
Classification: B60G

Abstract:
1. A system for controlling an active suspension of a vehicle, having a bounce transmissibility, a roll transmissibility, and a pitch transmissibility, where the bounce, pitch, and roll transmissibilities vary with respect to a frequency of vibration acting upon the vehicle, the system comprising: a tunable device configured for adjusting stiffness and damping of the active suspension; a controller in communication with the tunable device, the controller being configured to sense the frequencies of vibration and provide a control signal to the tunable device, wherein the control signal is based on a bounce component, a roll component, and a pitch component dependent on the bounce, pitch, and roll transmissibility at the sensed frequency, wherein the control signal includes a ride control component, a handling control component, and a dive/squat control component; wherein the controller includes a plurality of control strategies corresponding to a plurality of frequency ranges, and the control signal is based on a control strategy of the plurality of control strategies corresponding to a frequency range of the plurality of frequency ranges that includes the frequency of vibration; wherein the plurality of control strategies includes a passive suspension control strategy, a small stiffness and skyhook control strategy, a low damping control strategy, a high damping control strategy and stiff suspension strategy; and wherein the bounce control component Is based on the relationship where A 1 are estimated amplitudes of the bounce acceleration for the corresponding frequency ranges, wherein A 1 corresponds to the low frequency range, A 2 corresponds to the body mode frequency range, A 3 corresponds to the medium frequency range, A 4 corresponds to the wheel hop frequency range, and A 5 corresponds to the high frequency range, and ε is a small number selected to avoid singularity.