Control of internal combustion engine

A method of controlling an internal combustion engine system having an internal combustion engine, a valve driving mechanism which reciprocally drives an intake valve and an exhaust valve for a combustion chamber of said internal combustion engine with rotational movement of a crankshaft of said internal combustion engine, a turbocharger consisting of a turbine which is arranged in an exhaust passage from a combustion chamber of said internal combustion engine and a compressor which is arranged in an intake passage to said combustion chamber, an emission control device which is arranged in said exhaust passage downstream of said turbine, a first EGR passage which communicates said exhaust passage downstream of said emission control device and said intake passage upstream of said compressor, and the method comprising:

• shutting off supplying fuel to said combustion chamber under a predetermined condition;
• and
• decreasing a lift of said intake or exhaust valve for said combustion chamber during said shutting off supplying fuel to said combustion chamber compared to in a case of supplying fuel to said combustion chamber.