Effective road profile simulation method and system with tyre loss-of-contact compensation

摘要

A method and system for controlling an automotive vehicle spindle-coupled road simulator with a predetermined effective road profile for a road surface uses tyre loss-of-contact compensation to modify the feedback parameter in a control loop to avoid incorrectly loading a test vehicle. Tyre deflection obtained during measurement of a vehicle's tyre profile calculation is used to detect and flag regions where the tyre profile is not a function of the road input so that the tyre profile motion is governed only by the free dynamic response of the suspension. A tyre model is first developed for a vehicle. The vehicle is then coupled to the spindle-coupled simulator (10), and a set of control signals is generated in a feedback control loop. The control signals are used for driving the spindle-coupled simulator (10) with the vehicle attached thereto so that a response generated by the simulator is consistent with the predetermined effective tyre profile. Determination of the set of control signals includes selection of a feedback signal from a generated output representing a tyre in contact with the road surface and a tyre deflection output representing a tyre having lost contact with the road surface.