Patent ID: 6666177
Filing Date: 2003-12-23
Classification: F02D,Y02T

Abstract:
A method for operating an internal combustion engine with at least one working piston with a variable compression ratio, which can be changed as a function of an operating state of the internal combustion engine, the method comprising the steps of: detecting, with a knock sensor, when the compression ratio is too high; reducing the compression ratio (V) when the knock limit (L) is at least reached by a first, predetermined value (V1), which is a function of the operating state, over a first, predetermined time period (t1-t0); subsequently increasing the compression ratio (V) by a second, predetermined value (V2) over a second, predetermined time period (t2-t1) until the knock limit (L) is at least reached again; and determining at least one of the first predetermined value (V1), the first time period (t1-t0), the second predetermined value (V2), and the second time period (t2-t1) as a function of load demand on the internal combustion engine.