| 摘要 |
PURPOSE:To perform accurate crank angle compensation, by discriminating the drift of a pressure sensor output level just after a fuel cut, and stopping the compensation, in case of the device which operates the correction value of crank angle detection value by detecting a pressure peak at the time of fuel cut for deceleration. CONSTITUTION:At the time of fuel cut, slippage of a crank angle is found by measuring a pressure differential by a compression pressure detecting device 2 at symmetrical positions holding a top dead point in between. In this case, just after the fuel cut, since the temperature in a cylinder bore suddenly goes down, the output value of a sensor, using a piezoelectric element or the like, is made to drift inevitably and thereby it fails to perform accurate measurement. Accordingly, this drift is detected by a drift detecting device 6, and when it exists, the compensation for slippage in the crank angle is made so as not to be done. With this constitution, the compensation for an accurate crank angle is performable.
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