Abstract
Taking a small diesel engine as the prototype, emission researches for its structural features and different uses are carried out. Obvious differences of emissions for the same diesel engine using different test cycles are shown. By analyzing the test result, it has been found that the weighting factor of each mode is only part of the factors for the large differences of the emission values. The contributions of individual modes are used to analyze the mechanism of changing emissions of the diesel engine and it is found that reducing NOX of the full load for the mobile non-road diesel engine is the key to reach emission standard; for the fixed diesel engine, CO emission must be controlled at the same time. It has been found that it is necessary to take different combustion optimization parameters or measures to reduce the emission of the diesel engine according to the different uses of small diesel engine engines.
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