Effects of injector optimization on emissions on a high pressure common rail diesel engine

In the test, the engine run at a specific speed when fuel consumption (Be) and torque remained constant. An ETAS calibration system is used to control the Maps for adjusting the rail pressure and injection timing. Experimental data show that when fuel injection is delayed, fuel consumption, CO and HC increase while formation of NOx reduces. The formation rate of premixed gas is proportional to the rail pressure. When the rail pressure increases, more pre-mixed gas forms which will reduce the fuel consumption, improve CO and HC emissions but increase NOx. The data that is before and after optimization indicates that: in the selected test conditions, fuel consumption and torque are slightly lower on the optimized engine while values of NOx and smoke respectively reduce by 20% and 23%.