A METHOD OF CONTROLLING AN OPERATION OF AN INLET VALVE SYSTEM AND AN INLET VALVE CONTROL SYSTEM

摘要

Invention relates to a method of controlling an operation of an inlet valve system (10) arranged in connection with each cylinder (14) of an internal combustion piston engine (40), which method comprises during the operation of the engine steps of 1) Monitoring (15) at least one parameter relating to engine load conditions, 2) Controlling using a primary control procedure (16) an opening and closing timing of an inlet valve (20) of the inlet valve system (10) in response to the at least one parameter obtained in the step 1), and 3) Feeding (30) charge air into the said cylinder (14) via the inlet valve (20) of the inlet valve system (10) when the inlet valve (20) is open wherein the method comprises steps of using a secondary control procedure (18) wherein at least parameter relating to engine load conditions is measured (15, 17) and the closing timing of the inlet valve (20) of the inlet valve system (10) is controlled in response to the at least parameter relating to engine load conditions independently from and with higher priority than the primary control procedure (16). The invention relates also to an inlet valve control system (10) arranged in connection with each cylinder (14) of an internal combustion piston engine (40).