Model Based Diagnosis of Leaks in the Air-Intake System of an SI-Engine
One important area of SI-engine diagnosis is the diagnosis of leakage
in the air-intake system. This is because a leakage can cause
increased emissions and drivability problems. A method for accurately
detecting leaks is presented. The results are developed for a
turbo-charged engine but they are also valid for a naturally aspirated
SI-engine. The method is based on a physical model of the leaks and
includes an estimation of leakage area. By knowing the area, it is
possible to reconfigure the control algorithm such that, the effect of
the leak on emissions, is suppressed. As small leaks as 2 mm in
diameter can be detected and it is possible to distinguish between
leakages before or after the throttle. The method is suitable for
on-line implementation.
Mattias Nyberg and Andrej Perkovic
SAE Paper,
1998
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