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| Influence of EGR Cooled-Gas Temperature on Performance and Emissions of a Heavy Duty Diesel Engine |
| DOI：10.13949/j.cnki.nrjgc.2018.06.005 |
| Key Words:diesel engine emission exhaust gas recirculation cooled-gas temperature fuel consumption |
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| Abstract:A common rail heavy duty diesel engine with exhaust gas recirculation(EGR) cooler and variable geometry turbocharger was used to study the influence of EGR cooled-gas temperature on engine performance and exhaust emissions by bench test. The results show that the fuel consumption, NOx and smoke decrease when the EGR cooled-gas temperature declines. With every one degree decrease in EGR cooled-gas temperature, the reductions of fuel consumption, NOx and smoke at different operating conditions are quite different. At medium speed with low load, the fuel consumption reduces most; at high speed with low load, the NOx and smoke decreases most. Taking the energy consumption by EGR cooler into consideration, the actual fuel consumption can be calculated. In the principle of as low actual fuel consumption and low emissions as possible, the optimized EGR cooled-gas temperatures at which the actual fuel consumptions are the lowest can be determined at different operating conditions. |
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