Evaluation of duty cycle parameters of an HCCI-supercharged engine at various loads and rotational speeds of the crankshaft

The duty cycle parameters of the engine with spontaneous ignition of a homogeneous charge (HCCI engine) are largely determined by speed and load modes. To investigate the influence of the parameters of a working medium in the cylinder of the HCCI-engine, a design procedure is developed. The procedure is based on the equation for determining the pressure of a variable-mass working medium at the end of an elementary calculation section of the indicator diagram. The numerical analysis of the duty cycle under different loads and speeds of the HCCIengine crankshaft is performed. The engine is developed from the CHN13/15 diesel provided by ChTZ-URALTRAC Ltd. and uses the fuel which is a mixture of natural gas and dimethyl ether. It was found that increasing the cycle fuel supply from 0.13 to 0.18 g at the engine speed n = 2100 min^–1, the boost pressure p_a = 0.24 MPa, and the mass fraction of dimethyl ether φ_DME = 0.27 causes an almost linear increase in the mean indicated pressure p_i from 1.01 to 1.87 MPa. Reducing the engine rotational speed from 2100 to 1000 min^–1 deteriorates indicator parameters by about 2% if the other parameters are constant.

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