The Construction And Application Of Combustion Testing Platform For Small IC Engine

The test and control of combustion process are cores of the motorcycle engine research and development process, and is link for the engine each performance evaluation and control, and is foundations to carry out research on emissions, oil consumption and noise control and so on. Therefore, it is necessary to develop measuring platform of combustion work process for the small high speed gasoline engine, which will provide a basic tool for the enterprise next product development.This article introduced design, installation, and shaping and construction process of the entire combustion tests platform hardware in detail. This test platform is in view of compact characteristic for motorcycle engine structure, one-cylinder wind cooling and high speed, in order to guarantee the combustion process test precision and the reliability, research the installing method to the combustion analysis system instrument, designed installing hole and the adaptor of the cylinder internal pressure sensor, installing the seat cover of the inlet and the exhaust pressure sensor and the cooling water cycle system, as well as installing joint of the crank angle sensor and the measure of shock absorption.Based on tests the platform, measuring instantaneous cylinder internal pressure, the inlet pressure and exhaust pressure, and engine crank angle rotational speed, and so on. Through these test data, analyzing some important combustion natural parameter, such as diagram of work, indicate mean effective pressure, cyclic variation of combustion pressure, the maximum of combustion pressure and crank angle position, the maximum rate of combustion pressure rise and crank angle position, the maximum fluctuation for rate of pressure rise, fluctuation of inlet and exhaust pressure, combustion knock intensity, rate of combustion heat release, the accumulative of combustion heat release and so on, which how to influence engine combustion law.Carried on high frequency and the low frequency filter to the cylinder internal combustion pressure used the dynamic engine knock intensity calculation method, analyzed change and the distribution of the combustion knock at the different rotational speed and the load. At the same time, studied the engine heat release rule at the different operating mode, fitting the combustion quality parameter m value which matches with the actual result, and infers the change rule of the combustion quality parameter m value, has provided the effective accurate foundation parameter for the exothermic analysis computation simulation model.After the testing result, this combustion tests platform is a set engine combustion analysis system of dynamic response quickly, accurate, highly effective in the examination data real time display, it can widely be applied in the test of engine work process.