Fault effect analysis of the exhaust manifold leakage for a turbocharged spark ignition engine

Salehi, R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1177/0954407014521175
  3. Abstract:
  4. Fault monitoring in internal-combustion engines is crucial for keeping the vehicle performance within the acceptable standards of emission levels and drivers' demands. This paper analyses how a vehicle's performance and engine variables are affected by a leakage fault in the exhaust manifold. The threshold leakage that causes the vehicle to exceed the emission standards is determined for a class M1 vehicle tested on a chassis dynamometer over the New European Driving Cycle. It is shown that, when a leakage of 6 mm diameter on the exhaust manifold is introduced, the vehicle emissions exceed those specified in the European 2013 on-board diagnostics standard. In addition, the effects of the said leakage fault on the performance of a 1.7 l turbocharged gasoline engine are analysed at different speed-torque operating points by running the engine in a test cell. The results show that, for this 6 mm leakage, at most operating points the driver cannot notice any reduction in the engine torque. Using the engine performance analysis, a fault effect map for the turbocharged gasoline engine is obtained. This helps to design monitoring algorithms for detection of the exhaust manifold leakage fault. As an application of the map, a strategy is presented on the basis of a comparison between the measured and the estimated pressures downstream of the turbine for the purpose of detecting the exhaust manifold leakage
  5. Keywords:
  6. Fault effect analysis ; Chassis dynamometers ; Diesel engines ; Dynamometers ; Engines ; Fault detection ; Gasoline ; Vehicle performance ; Exhaust manifold leakage ; Emission standard ; Engine performance ; Fault effect ; Monitoring algorithms ; New european driving cycles ; On-board diagnostics ; Turbocharged gasoline engines ; Exhaust manifolds
  7. Source: Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering ; Vol. 228, issue. 8 , 2014 , pp. 970-984 ; ISSN: 09544070
  8. URL: http://pid.sagepub.com/content/228/8/970