Left: Traditional combustion event. Fuel enters via the intake port and a spark plug ignites the air and fuel mixture. The “burn” of the mixture projects from the spark and the flame progresses throughout the combustion chamber. Right: HCCI combustion event. Fuel enters via an injector in the combustion chamber. The air and fuel mixture ignites through heat caused by compression and without a spark. The lower temperature “burn” of the mixture is simultaneous and even throughout the combustion chamber. When combined with several additional advanced technologies, GM’s HCCI engine achieves up to 15 percent improved fuel efficiency, while meeting future emissions standards. Traditional spark ignition is used when the engine is started cold to generate heat within the cylinders and quickly heat up the exhaust catalyst and enable HCCI operation. X07PT_AR022 (United States)
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