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One method is the pilot injection in order to clear up the urgent subjects imposed on a DI diesel engine for the exhaust emissions without falling its high thermal efficiency. The pilot injection method can be expected to bring forth a shorter ignition delay, a low peak pressure and a low pressure rise, that is, a slow heat release. The possibility to apply the pilot injection to a DI diesel engine is discussed in this paper. The effectiveness of the pilot injection is estimated by the temperature and the heat release rate calculated from the pressure histories in cylinder.