Effect of Exhaust Gas Recirculation with Combustion Boundary Conditions on Thermal Efficiency of Turbocharged Port Fuel Injection Gasoline Engine
The influence of exhaust gas recirculation coupled with various combustion boundary conditions on brake specific fuel consumption and cyclic variations of indicated mean effective pressure is investigated in a 1.3 L turbocharged port fuel injection gasoline engine.Results show that it is important to make supercharging technology,exhaust gas recirculation and high compression ratio control harmoniously,which favors to both brake specific fuel consumption and cyclic variations.Introducing exhaust gas recirculation into gasoline engine can improve the brake specific fuel consumption under medium and high loads (including wide open throttle operation) at 1 500-2 500 r/min,however,it has little improvement on brake specific fuel consumption under the loads of 0.2-0.6 MPa BMEP (brake mean effective pressure) and engine speed of 2 000 r/min.Considering the high energy consumption of the capacitor discharge high-energy ignition system,introducing exhaust gas recirculation into gasoline engine does not effectively improve brake specific fuel consumption but improve cyclic variations under the loads of 0.2-1.0MPa BMEP and engine speed of at 2 000 r/min.Fuel consumption per 100 km for the vehicle equipped with the turbocharged gasoline engine coupled with supercharging,exhaust gas recirculation,high tumble inlet ports and 1.3 L displacement is estimated 8.86％ under NEDC (new European driving cycle) condition,which is lower than that equipped with 1.6 L displacement naturally aspirated engine.
port fuel injection gasoline engineexhaust gas recirculationcombustion boundaryfuel consumption ratecyclic variation
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万方数据
维普
