Fuel Injection Quantity Correction Strategy for High-pressure Common Rail Fuel System Based on Transient Rail Pressure Drop

Influences of fuel injection quantity,engine speed and common rail pressure on transient rail pressure drop of high-pressure common rail fuel system were researched through the experiment.The research result shows that the transient rail pressure has an obvious drop after the injection starts and the drop amplitude has close relationship with fuel injection quantity,engine speed and common rail pressure.Based on the influences of fuel injection quantity,engine speed and common rail pressure on transient rail pressure drop,the correction strategy of cycle fuel injection is established.The further experiment shows that the strategy can improve the uniformity of cycle fuel injection and the cycle-to-cycle variation to a great extent.