Compression ratio has very important influence on fuel economy, emission, and other performances of internal combustion\nengines. Application of variable compression ratio in diesel engines has a number of benefits, such as limiting maximal in cylinder\npressure and extended field of the optimal operating regime to the prime requirements: consumption, power, emission, noise, and\nmultifuel capability.Themanuscript presents also the patentedmechanismfor automatic change engine compression ratiowith twopiece\nconnecting rod. Beside experimental research,modeling of combustion process of diesel engine with direct injection has been\nperformed.The basic problem, selection of the parameters in double Vibe function used formodeling the diesel engine combustion\nprocess, also performed for different compression ratio values.The optimal compression ratio value was defined regardingminimal\nfuel consumption and exhaust emission. For this purpose the test bench in the Laboratory for Engines of the Faculty of Engineering,\nUniversity of Kragujevac, is brought into operation.
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