| 摘要 |
The invention relates to a method for closed-loop control of the positioning of a predetermined fuel amount in the working cycle of a combustion engine of the Otto-type. The predetermined amount of fuel is supplied to the combustion chamber via an injector and the ignition of the air-fuel mixture is initiated after the fuel having been supplied by using a spark plug arranged in the combustion chamber. With a biased measuring gap arranged in the combustion chamber, could a measuring voltage UION be obtained which corresponds to the degree of ionisation during the flame ionisation phase. A parameter, dUION/dt, characteristic for the basic frequency in the measuring voltage during the flame ionisation phase is detected, which parameter could be used in order to indicate if an initiated correction of the injection timing is correct if the basic frequency increases, and vice versa indicates an incorrect correction of the injection timing if the basic frequency decreases. Preferably the basic frequency is detected by derivation of the measuring voltage during the period A, B, C or D, said derivation initiated by reference to time t or crankshaft angle VC, i.e. dUION/dt or dUION/dVC respectively.
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