Focued on the diesel engine starting injection quantity control strategy based on the target engine speed curve

the calculation of target indicated torque was introduced in detail

and the comparison tests between constant injection quantity control

torque MAP control and the researched target speed based torque control was conducted. The result shows that although the NOx emission of the torque MAP control is the lowest among the three control modes

the combustion efficiency is obviously lower than others and the HC as well as the CO emission is at a fairly high level. Fewer fuel is consumed in the target speed based torque control because the injection quantity is controlled with great accuracy according to the indicated torque in need during diesel engine starting process

so that the combustion efficiency is the highest and the CO2 emission is the lowest among the three control modes. The HC and CO emissions of target speed curve based torque control is at a similar level as the constant injection quantity control. However

when it comes to the engine speed stability and the NOx emission

the target speed curve based torque control shows an overwhelming predominance.