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Control of combustion by fuel injection is a basic part of the original concept of the diesel engine. The analysis presented shows how a digital computer engine with automatic compression ignition is used to investigate some of the many factors involved in the control of compression ignition and burning of fuels. The digital engine, including an automatic digital combustion process and digitalized fuel characteristics, appears to be the only practical means to coordinate all the interrelated factors involved in the simple diesel engine with no ignition system. This digital engine materially aids in properly interpreting engine test data to show the correct steps for obtaining optimum engine development. This paper presents the progress made on one contemporary digital engine in the field of automatic combustion by compression.

Presented in this paper are the methods used in TRW’s digital computer program for reciprocating engine cycle analysis to incorporate various combustion processes, to account for different fuels, and to determine the environment for combustion based on operating conditions and engine design. Also included are samples of results of calculations on ignition delay in compression ignition engines and knock under various conditions in spark ignition engines.