Emission And Performance Pevelopment Of Weichai WP3 Eur4 Diesel Engine

Present society with the rapid increase in car ownership, car exhaust emissions seriously affect human health and the ecological environment, the relevant research shows that automobile exhaust has become the center of the city’s haze culprit. In Beijing, for example, the latest data shows, in Beijing haze particles the exhaust of motor vehicles accounted for 22.2%, coal accounted for 16.7%, dust accounted for 16.3%, industry accounted for 15.7%, thus the engine exhaust emissions has become one of the main component of haze.With the aggravation of haze phenomenon in recent years, the emission problem of the engines has been paid more and more attention, national and regional governments also continuously introduce new regulations to limit emissions to improve the environment. More and more strict emission regulations continue to put forward new challenges to the internal combustion engine technology, how to ensure the diesel engine thermal efficiency and reduce harmful emissions is the main problem of the development of diesel engine performance.This paper study Weichai WP3 diesel engine, VM-D series is based mechanical two-stage introduction of the Italian mechanical pump diesel engineering by optimizing the body structure, re-match BOSCH high pressure common rail system production to meet the country Ⅳ vehicle emission regulations by stage diesel engine. focuses on reducing the harmful emissions of diesel engine, taking Weichai WP3 engine which equipped turbocharger with intercooler and high pressure common rail diesel system as an example to research the feasibility of DOC+POC solutions to achieve National Ⅳ emission by EGR. Besides, from the 3D CFD simulation, DOE configuration, multiple injection, emission calibration to research the methods to reduce engine raw emissions, optimize noise. Ultimately, match the reasonable aftertreatment system and meet the State Ⅳ emission legislation.Final result shows that through early performance simulation and configuration selection can significantly reduce the engine raw emissions and reduce the dependence on aftertreatment system; combining with multiple injection technology can achieve better tradeoff result between NOx and PM than single injection strategy; reasonable emission calibration and matching process can optimize engine noise, vibration and reduce the final emission. For vehicles equipped with diesel engines, the EGR+TDI+DOC+POC technical route, can achieve the National Ⅳ emission requirements.