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An Analysis of the Working Process of a Diesel Engine under Cylinder Deactivation

The effect of cylinder deactivation as a method of controlling a diesel engine working in partial load modes is usually justified based on the characteristics corresponding to the engine performance without cylinder deactivation. However, the results obtained through theoretical analysis and in practice have significant differences, since the working processes of activated and deactivated cylinders run in different ways. In this paper, a simulation method is used to analyze the working process of the diesel engine under cylinder deactivation. The working processes in activated and deactivated cylinders are calculated using a computer model, and energy losses determining engine fuel efficiency are estimated. It is shown that the valve system in deactivated cylinders has a significant effect on the specific fuel consumption. The engine performance in partial load modes at different rotational speeds and torques and with a varying number of deactivated cylinders is investigated. The results obtained demonstrate the characteristics of the engine working process under cylinder deactivation and enable a more accurate estimation of the effect of this engine control method.