engleski

Experimental Testing of the Spark Ignition and HCCI Engine

Legal limits for permissible values of pollutants from internal combustion engines are constantly reduced. In order to reduce air pollution and to achieve these limits, new combustion processes in engine cylinder are constantly developing. One of these processes is HCCI (Homogeneous Charge Combustion Ignition). HCCI engine has the advantage of lower emissions of nitrogen oxides (NOX) and particulate matter (PM), and at the same time high efficiency. In addition to these advantages, the main disadvantage is difficulty to control the combustion process which is the main reason for a lack of implementation of the HCCI engine in commercial purposes. In the Laboratory for IC Engines and Motor Vehicles of the Faculty of Mechanical Engineering and Naval Architecture an experimental setup for internal combustion engine testing is developed. The core of the setup is an experimental engine which is made by modifying single cylinder diesel engine Hatz 1D81Z. Experimental engine after minor modifications can operate in spark ignition (SI), and in HCCI mode. The experimental setup allows measurement and acquisition of various values that can be divided into two groups. The first group of data indicates combustion process quality in the engine cylinder, e.g. indicated mean effective pressure (IMEP), the rate of heat release (ROHR), etc. while the second group of data determines basic characteristics of the IC engine such as torque, power, specific fuel consumption and NOX emissions. The aim of this study was a comparison of two different combustion processes in the engine cylinder. In this comparison the engine indicated mean effective pressure is held constant, while the air to fuel mixture, spark timing in SI mode, the intake air temperature in HCCI mode and exhaust pressure were varied.

SI engine; HCCI engine; experimental engine testing

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