Abstract: A method of testing magnetorheological fluid comprises cycling the fluid at an elevated temperature, allowing the fluid to stand, performance testing the fluid, cycling the fluid at superimposed frequencies, and noting settling characteristics of the fluid.

Abstract: A suspension system control according to the steps of: determining an actuator demand force command; determining, responsive to vehicle speed, a first signal indicative of a first maximum demand force; determining, responsive to ambient temperature, a second signal indicative of a second maximum demand force; and constraining the determined actuator demand force command so that it is no greater than the lesser of the first and second maximum demand forces, wherein vehicle body isolation from suspension events is maintained during low temperature and low speed operation of the vehicle to thereby minimize suspension noise and ride harshness.

Abstract: A quarter car vehicle suspension including a wheel, a bearing having an axis of rotation, the piston rod axis aligned at an acute angle with respect to a spring axis of a coil spring of the suspension, and a spring seat integral with the bearing, wherein the bearing is located between the spring seat and the vehicle body, and wherein the axis or rotation of the bearing is substantially aligned with a spring axis and at an acute angle to the piston rod axis.