Combustion Analysis Testing Control System Of Internal Combustion Engine

Analysis based on indicator diagram information is important to investigate in-cylinder working process in engine. The technology of data acquisition and processing, including the technology of sensor, signal acquisition and conversion, computer, is important means and method to acquire the information. At present, the method of cylinder pressure detection is usually used in engine working process. We can use it to draw the indicator diagram with the signals of cylinder pressure, crank angle and top dead center(TDC) acquired by high speed A/D card. Based on the indicator diagram, we can obtain many physical parameters of in-cylinder combustion such as fire initial point, indicator work, the maximal pressure and corresponding crank angle and heat release rate, thus measure the precise function of engine. Foreign specialized combustion analyzers on in-cylinder have advanced and powerful function but expensive, hard to repair. It entails the correlation equipment make fast and wide development.Using current equipment in laboratory, multi-cylinder, engine signal acquisition and combustion analysis system is developed. The system consists of data acquisition system and combustion analysis system. Hardware components include A/D card, spark plug cylinder pressure sensor, charge amplifier, photoelectric encoder, computer, etc. The booming of Windows operation system especially the emerging of visual programming, provides a strong graphic interface and friendly man-machine interactive function. So, Visual C++ is adopted to the develop the data acquisition and combustion analysis system respectively. Based on Software Engineer guidance, the idea of object-oriented programming is used to develop most process. The interface contains many functions such as data acquisition, drawing indicator diagram, calculating heat release rate, rate of pressure rise diagram, cyclical fluctuations, and so on. The interface is designed direct-viewed, easily operated. Independent modules are convenient for extending more functions.The system has made the cylinder data acquisition on gasoline engine BJ491EQ1 and diesel engine BJ483ZQB, the differences of cylinder– to– cylinder of gasoline engine and the cylinder pressure oscillation of diesel engine in different work condition were investigated for details, and analysed the maximum pressure of the two engines by the pressure rise rate graph, analysised the combustion process associate with the curve of heat release rate by the last, and got the analysis. A series of analysis is advantageous to optimize the engine combustion organization and the structure.