Sensing potentiometer unit e.g. for vehicle accelerator pedal control - has pairs of potentiometers linked to control unit via filter circuits to eliminate ageing effects of potentiometer tracks.

摘要

Each vehicle function normally monitored by sensors has a second, similar sensor to provide a parallel, redundant signal. The two signals are compared via filter circuits and a control circuit. The settings of the vehicle controls etc. are determined by the signal shapes from the filter circuits and not by mere potentiometer levels. Simple low-pass filter circuits are used to process the sensor outputs. The control circuit can switch different reference signals to the sensors to monitor the sensor reaction. Periodical self-analysis reduces failure risk. ADVANTAGE - Accurate sensor function, not affected by potentiometer track wear.