Demonstration of HCCI Using a Single Cylinder Four-stroke SI Engine with Modified Valve Timing

George Kontarakis; Nick Collings; Tom Ma

doi:10.4271/2000-01-2870

2000-10-16

Demonstration of HCCI Using a Single Cylinder Four-stroke SI Engine with Modified Valve Timing 2000-01-2870

A standard port fuel injected, unthrottled single cylinder four-stroke SI engine, with a compression ratio of 10.3:1, and using standard gasoline fuel, has been adapted to operate in the homogeneous charge compression ignition (HCCI) mode, by modifying the valve timing. It has been found that over a speed range of between 1300 and 2000 rpm, and lambda values of between 0.95 and 1.1, stable operation is achieved without spark ignition. The internal EGR rate was estimated to be about 60%, and emissions of NO_X were typically 0.25 g/kWh.

Practical implementation of this HCCI concept will require variable valve timing, which will also enable reversion to standard SI operation for maximum power.

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Demonstration of HCCI Using a Single Cylinder Four-stroke SI Engine with Modified Valve Timing 2000-01-2870

SAE MOBILUS