Emissions from modern SI-engines are reduced by a three way catalyst. However if there are leaks in the exhaust system before the catalyst emissions increase for two reasons. First the untreated emissions leak out. Second which is worse, due to waves in the exhaust system, oxygen leaks into the manifold and causes an oxygen sensor offset. The result is increased emissions as the air/fuel controller makes the engine run rich.Here a method to detect leakages in the exhaust manifold is presented. The sensors used are binary oxygen sensor(s), intake manifold pressure and temperature, and the air mass flow sensor. Injection time is also used to estimate air/fuel ratio. Experimental results are shown with measurements from a turbo charged SAAB SI production engine with wastegate.
Detection of Exhaust Manifold Leaks on a Turbocharged SI-Engine with Wastegate
Sae Technical Papers
SAE 2002 World Congress & Exhibition ; 2002
2002-03-04
Conference paper
English
Detection of Exhaust Manifold Leaks on a Turbocharged SI-Engine with Wastegate
British Library Conference Proceedings | 2002
|Detection of Exhaust Manifold Leaks on a Turbocharged SI-Engine with Wastegate
British Library Conference Proceedings | 2002
|Detection of exhaust manifold leaks on a turbocharged spark ignition engine with wastegate
Automotive engineering | 2002
|Exhaust Manifold Pressue Estimation on a Turbocharged SI-Engine with Wastegate
British Library Conference Proceedings | 2001
|British Library Conference Proceedings | 1994
|