Method for checking operability of valve in gas passage of combustion engine of motor car, involves measuring signal strength of filtered measurement signal, and testing functionality of valves based on measured signal strength of signal

摘要

The method involves actuating valves (7a, 28) with a drive signal with predetermined driving frequency, and detecting a measuring signal from a load sensor (17) and an impact sound sensor (13) of an internal combustion engine (1). The detected measurement signal is filtered by a bandpass filter having the predetermined driving frequency. Signal strength of the filtered measurement signal is measured. Functionality of the valves is tested based on the measured signal strength of the filtered measurement signal. An independent claim is also included for a control device for a motor car.