System for detecting defective injection valves in direct injection IC engines comprises lambda probe in exhaust system, processor determining frequency of fluctuations in lambda value and second processor which locates defective valve

摘要

The system for detecting defective injection valves in direct injection IC engines comprises a lambda probe mounted in the exhaust system. A processor determines the frequency of fluctuations in lambda value over periods of operation and a second processor locates the defective valve when the frequency exceeds a threshold value. An independent claim is included for a method for detecting defective injection valves in direct injection IC engines.