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The paper presents the thermodynamic analysis of the engine supplied with small and large diesel fuel doses while increasing natural gas quantity. The paper presents changes in the combustion process thermodynamic indexes and changes in the exhaust gas emissions for dynamically increased share of the gaseous fuel. The cylinder pressure history was subject to thermodynamic analysis, . based on which the mean indicated pressure, the heat release rate, the quantity of heat released as well as the pressure rate increase after self-ignition were determined. These parameters were also referred to the subsequent engine operation cycles by specifying the scope of the change per cycle. The relationship between the engine load and the start, the center and the end of combustion while increasing the gas amount supplied to the cylinder was indicated.

Controlled combustion in direct injection stratified charge engines can be achieved by the use of impinging jets for injection as well as for ignition, in association with a close-loop, electronic control system. Upon the description of the method of approach required for the design of a control strategy, illustrated by application to a conventional diesel engine, salient features of novel concepts for direct injection stratified charge engines are presented.