Torque curve controlling method for lean-burn internal combustion engine, involves changing switching phase of stroke and inlet valve when air-fuel ratio exhibits value larger than one and firing angle exceeds maximum firing angle

摘要

The method involves changing a switching phase of a stroke (200) and an inlet valve (160) i.e. butterfly valve, of a valve stroke changing device (220) with lean-burn phase when air-fuel ratio exhibits a value larger than one and a firing angle exceeds a maximum firing angle. A filling change device (100) is controlled such that filling at beginning of the switching phase and filling at end of the switching phase are equal. The filling change device changes size of the filling according to valve position. Independent claims are also included for the following: (1) an electrical memory medium comprising a computer program for controlling torque curve of a lean executable internal combustion engine (2) a control and/or regulating device for controlling torque curve of a lean executable internal combustion engine.