Patent Number: 6,311,110

Title: Adaptive off-state control method

Abstract: An Adaptive Off-state (AO) control method (55) for use in conjunction with a suspension system (10) including a controllable damper (22) interconnecting relatively moveable members (12, 14) to reduce the transmission of vibrational forces therebetween. Such suspension systems (10) are switchable between alternative on- and an off-state in accordance with a primary control method (53) and/or a secondary override control method (59). Sensors (48, 52) monitor the parameters of the suspension system (10), such as the displacement, velocity, and acceleration of the moveable members (12, 14). Damper command signals (107) are provided to the damper (22) in the on-state (116) to adjust the damping characteristics thereof. In the off-state, the damping signal in conventional systems is approximately zero or a constant relatively low magnitude. According to the present adaptive off-state control method (55), the off-state damping signal (109) to the controllable damper (22) is modulated over time to make the off-state damping a function of the system inputs. In a preferred embodiment, the modulation is a function of the real time or time-averaged input disturbances to the system (10). In an alternative embodiment, the modulation is derived from a user switch (57) that imparts a user variable Off-State Gain (OSG) to the off-state damping signal (109) based on operator perceived ride characteristics.

Inventors: Ivers; Douglas E. (Cary, NC), St. Clair; Kenneth A. (Cary, NC)

Assignee: Lord Corporation

International Classification: B60G 17/015 (20060101); B60G 17/018 (20060101); B60G 7/04 (20060101); B60G 7/00 (20060101); F16F 15/00 (20060101); F16F 9/48 (20060101); G05B 13/02 (20060101); B60G 023/00 (); B60G 017/005 (); B60G 021/045 (); G06F 017/00 ()

Expiration Date: 10/30/2018