International Science and Technology Journal

The goal of this work is to understand how the thermal influence of combustionchamber deposits can be utilized to expand of the operating range of HCCI combustion.In order to do this, two main objectives must first be met; tracking deposit formationtrends in an HCCI engine and determining the sensitivity of HCCI combustion to CCD.This requires testing that demonstrates the differences in combustion between a cleanengine and one with deposits coating the chamber. This will involve a long-term test thattracks the effects of CCD on combustion. The test will start with a clean engine. One baseline HCCI operating point is maintained for the duration of the test during whichgradual combustion chamber deposit formation will occur. Combustion parameters,including heat release rates and emissions will be tracked for the duration and comparedto the case of a clean engine This work will begin by detailing the specifics of the test procedure andmeasurements taken throughout the test. Then a review of the effects of the gradualformation of deposits in the engine will be given.