Hysteresis-free control of positioner in motor vehicle - involves periodic alternation of values of controlling signal adjusted by feedback from position-sensing device

摘要

A controlling element (36) such as the throttle flap or its bypass valve is coupled mechanically (34) to a rotor (32) in the field of an excitation winding (30) supplied with current from an output stage (22) wired (20) to the controller (10). Position feedback (40) from a sensor (38) on the coupling is applied to the controller together with signals (12,14) from measuring devices (16,18) on the engine or vehicle. Different values of control signal are applied alternately to achieve the desired position. USE/ADVANTAGE - For adjustment of, e.g. engine idling speed, consistent relationship between control signal and position is guaranteed with less frequent and sensitive measurements.