Abstract
The diesel engine power demand of the start condition can be separated into two parts including resistance overcoming and acceleration realization for the reason that there is no power output during the starting process. The present paper mainly focuses on the fuel injection quantity control based on the engine power demand especially the acceleration demand for the resistance force is fixed for a specific engine, and the starting acceleration velocity is set as a target curve so that the acceleration process can also be fixed. The feasibility of the start control strategy proposed in this paper was verified by a comparison of the traditional starting control with a constant fuel quantity, and starting performance of the target acceleration based control shows predominance to the constant quantity control. And then the comparison between various starting acceleration processes, which was realized by the settings of acceleration curve slope factor, was conducted and results showed that the acceleration processes with higher slope factors perform better.
Highlights
Diesel engine is getting more and more popular for its efficiency and reliability [1] under the increasingly strict emission law and the low carbon demand [2, 3]
A great fluctuation of engine speed from the constant quantity control is displayed whereas the starting to idling transition is pretty smooth in the target acceleration control
The fuel quantity in the subsequent idle condition fluctuates much in the constant quantity control for the application of PID control but that in the target acceleration control keeps at a stable level because the fuel quantity injected is according to the engine operation demand strictly and little fuel quantity overshoot appears
Summary
Diesel engine is getting more and more popular for its efficiency and reliability [1] under the increasingly strict emission law and the low carbon demand [2, 3]. The diesel engine starting performance can be even poor, especially when it comes to the combustion efficiency [12], at the extremely low temperature [13, 14]. Broatch et al [19] proposed a new method for estimating the threshold temperature for self-ignition of fuel during cold start of diesel engines. They concluded that the threshold in-cylinder temperature was about 415∘C for both low and high compression ratio engines and it could well instruct the application of glow plug under extremely low temperature. The pilot injection plays an important role in the ignition and combustion process [22,23,24] and the swirl number should be modified to the suitable level [20]
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