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In order to collect the engine performance data and determine optimum engine conditions, engine performance test based on interface unit were tested. This paper was carried out that engine' performance was developed using interface unit between personal computer and diesel engine. The results of the study are summarized as follows: Interface unit was developed. By using PAL, simulation was carried in order to logic's inspection. From this test, NOx were decreased, otherwise PM were increased. By using EGR system, PM were increased by twice in the high load ranges, it was not seen to come into effect in the low load ranges. This system was tested D-13 mode, the results were decreased more than 50% in the NOx emission.