Method of stopping internal combustion engine

Method of stopping an internal combustion engine having a combustion chamber and an intake valve which opens during an intake stroke of an engine cycle to allow air to be inducted into said combustion chamber, the method comprising:

• reducing a lift of said intake valve and shutting off fuel to said combustion chamber upon a request of engine stop;
• maintaining a speed of said internal combustion engine within a predetermined range without supplying fuel to said combustion chamber and with said reduced lift of said intake valve at least for one intake stroke of said combustion chamber;
• and
• decreasing the speed of said internal combustion engine with said reduced lift of said intake valve from said predetermined range.

A power-train system comprising:

• an internal combustion engine with a plurality of combustion chambers having intake valves 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 combustion chambers;
• a first rotational machine capable of converting rotational power from first energy and rotationally coupled to said internal combustion engine;
• and
• a controller configured to:
• control said variable valve mechanism to reduce the lifts of said intake valves and said fuel supply system to shut off fuel to said combustion chambers upon a request of engine stop;
• regulate said first energy to maintain a speed of said internal combustion engine within a predetermined range and decrease it after intake strokes for all of said combustion chambers have taken place.