| 摘要 |
A hybrid homogeneous charge compression ignition and spark ignition engine is disclosed. The engine comprises at least one cylinder including at least one intake valve and at least one exhaust valve. A pair of camshafts is used. The first camshaft is structured and arranged to operate at least one of the intake valves and the second camshaft is structured and arranged to operate at least one of the exhaust valves. The engine also includes a variable camshaft timing device operatively connected to the camshafts for operating the engine in a homogeneous charge compression ignition mode and in a spark ignition mode. A method of operating the homogeneous charge compression ignition and spark ignition engine is also disclosed. The method includes the steps of operating at least one of the intake valves by a first camshaft, operating at least one of the exhaust valves by a second camshaft and determining an engine load condition. The method also includes operating at least one of the camshafts by a variable camshaft timing device based on the determined engine load condition. This allows the engine to operate using homogenous charge compression ignition when the engine is in a low load condition and to operate using spark ignition when the engine is in a high load condition. Operation in the full load condition is also included with and without supercharging or turbocharging.
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