Patent ID: 7477981
Filing Date: 2009-01-13
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. An arrangement for controlling a combustion engine, wherein the combustion engine comprises a combustion chamber, a movable piston for compressing a fuel mixture in the combustion chamber so as to cause self-ignition of the fuel mixture, a crankshaft driven by movement of the piston, at least one inlet valve of the combustion chamber and at least one exhaust valve of the combustion chamber, wherein the arrangement comprises: a control unit operable for initiating at least one of a closure and an opening of the at least one inlet valve and the at least one exhaust valve at a current crankshaft angle as a function of at least one operation-related parameter such that the self-ignition of the fuel mixture occurs when the crankshaft is at a target crankshaft angle; a storage device operable to store a relevant value of the current crankshaft angle only for when the crankshaft is at a predetermined rotational angle; a parameter-estimator operable for estimating values of the at least one operation-related parameter during operation of the combustion engine; and the control unit is operable to initiate the at least one of the closure and the opening of the at least one inlet valve and the at least one exhaust valve according to the stored value of the current crankshaft angle.