| 摘要 |
PURPOSE: A crank angle compensation method is provided to allow the engine to be operated at the optimum ignition and injection time by preventing error of crank shaft angle measurement. CONSTITUTION: A crank angle compensation method comprises the first step(S100 to S120) of initializing variables upon start of an engine, detecting the first cylinder pressure signal and judging whether a fuel cutoff condition is satisfied; the second step(S130,S140) of measuring the maximum value of cylinder pressure and learning and correcting the measured angle of the first cylinder, if it is judged in the first step that the fuel cutoff condition is satisfied; and the third step(S150,S160) of calculating the current crank angle in accordance with the measured angle of the first cylinder learned and corrected in the second step, and outputting a crank angle control signal corresponding to the calculated current crank angle.
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