A rule-based technique for two-state switchable suspension dampers

Abstract

Abstract

Following the introduction of an adaptive suspension system based on two-state switchable dampers for the Ford Mondeo, a requirement arose for a damper test system. A method was needed whereby the damper switching operation could be checked during routine servicing, without removing the damper from the vehicle. A technique has been developed which allows the switching function of each damper to be assessed by analysing the response of the vehicle to a series of ‘depress and release’ tests. A displacement transducer and data logging system record the displacement—time history at each wheel of the vehicle. An algorithm has been developed which is capable of differentiating between a damper switching failure and consequent alterations in the response of the vehicle caused by coupling effects.