Abstract
The existing methods of diesel engine start up using gas engine fuel imply either introduction of design changes to implement spark ignition, or maintaining the supply of a certain proportion of diesel fuel in the air-gas mixture. The second method is more preferable, since it leaves the possibility of an easy return to the initial state, allows work only on the diesel process and does not require significant changes in the design. This method attracts the greatest attention of modern researchers, however, the final technical solutions and methods of work on such a gas-diesel process have not yet been developed, and the existing practices are expensive to implement or are not effective enough. The issues of ensuring high ecological parameters also remain in abeyance. Studies show that in order to reduce nitrogen oxide emissions, it is necessary to achieve the elimination of residual oxidant in combustion products, which is possible due to formation of a stoichiometric mixture in the cylinder. For this purpose, as well as to increase the overall combustion efficiency and improve the thermal balance of the engine, the authors propose a system for injecting gas in the liquid phase directly into the combustion chamber at the compression stroke. The described system assumes the maximum usage of standard engine components of MMZ D-245 type with seats for glow plugs in the cylinder head, where nozzles for supplying liquid gas will be installed. In this case, gas injection is possible by standard means of the Common rail system. Concurrently, there are already the necessary technical solutions that improve the operation control of the injection pump and ensure prevention of detonation combustion. The appropriate balance of the amount of both fuel types is calculated according to the known relationships. The analysis of the results of early studies showed that such a scheme deserves attention. Thus, the authors substantiated the currently absent approach, which makes it possible to improve the environmental performance of an engine operating on a gas-diesel process, implemented by available means.
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