Torsional vibration active control of a diesel engine based on adjustment of the fuel injection vector

The torsional vibration of a crankshaft greatly affects engine performance, and the control and suppression of such vibration have thus always been a focus of engine research. The introduction of an electronic fuel-injection system for the diesel engine has made it possible to control individual cylinders, thus providing a new way to actively control the torsional vibration of a diesel engine. A V8 diesel engine model for co-simulation between crankshaft dynamics and engine performance was established with GT-SUIT software, and the model was verified by experiment data. The active control of crankshaft torsional vibration of a diesel engine by adjusting the fuel injection vector was simulated. First, the amplitude-frequency and phase-frequency characteristics of the excitation torque under different fuel-injection-vector conditions were analyzed. On the basis of the frequency characteristics, different active vibration-suppression schemes were studied, and the crankshaft vibration suppression effects were compared. The simulation results show that adjusting the fuel injection vector is an effective approach for controlling the torsional vibration of an engine crankshaft.