Patent ID: 7690338

Claim:
A power-train system comprising: an internal combustion engine with a plurality of combustion chambers having intake valves each of which opens during an intake stroke of an engine cycle to allow air to be inducted into each of said combustion chambers; a variable valve lift mechanism capable of variably setting lifts of said intake valves; a fuel supply system configured to supply fuel individually to said plurality of combustion chambers; a first rotational machine capable of converting a first energy into rotational power, said first rotational machine rotationally coupled to said internal combustion engine; and a controller configured to: control said variable valve lift mechanism to reduce the lifts of said intake valves; adjust said first energy to crank said internal combustion engine upon an engine start request; control said fuel supply system to start supplying fuel by injecting fuel into only one combustion chamber of said plurality of combustion chambers, said one combustion chamber in an exhaust stroke of an engine cycle at a time of the engine start request, so that a first combustion of the supplied fuel and air takes place in said one combustion chamber of said plurality of combustion chambers; and control said variable valve lift mechanism to set the lifts of said intake valves greater after said first combustion.