Özet:

The increasingly stringent emission regulations for the road transport sector require the implementation of new emission reduction techniques for internal combustion engines. In order to reduce exhaust emissions, some precautions must be taken after or during combustion. Low temperature combustion cycles are a popular research subject because they provide both low emission levels and high energy conversion rate. Reactive controlled compression ignition (RCCI) combustion mode is advantageous in that the combustion phase is more controllable and offers a wider operating range than other low temperature combustion modes. However, in RCCI mode, the start of the direct injection must be controlled instantaneously in order to ensure the highest efficiency in every operating condition. In this study, a direct injection gasoline engine with a compression ratio of 9,2 was operated in RCCI mode, and the start of the direct injection was controlled according to the instantaneous change of the combustion phase (KA50) and the injection advance map and operation maps were obtained for different inlet air temperatures. The widest operating range was achieved at an inlet temperature of 80 °C. The minimum specific fuel consumption was measured as 232,3 g/kWh. Although the compression ratio of the engine used is very low, the specific fuel consumption values are quite low, which is an indication of successful combustion phase control

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