Importance

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Abstract

A failed manifold pressure sensor is identified in a control apparatus having two manifold pressure detecting systems as a failsafe. A first comparing unit outputs an abnormal signal when a difference .DELTA.P between manifold pressures PMa and PMb detected respectively by two sensors is larger than a threshold value DP. A manifold pressure estimating unit estimates the manifold pressure from the engine revolution Ne, a throttle opening PLP, and an atmospheric pressure PAa. The difference calculating unit calculates a difference .DELTA.PMb between the detected manifold pressure PMb and the estimated manifold pressure PMcal. The difference calculating unit calculates a difference .DELTA.PMa between the detected manifold pressure PMa and the estimated manifold pressure PMcal. A second comparing unit compares the difference .DELTA.PMa and the difference .DELTA.PMb in response to the aforementioned abnormal signal. The failed manifold pressure sensor is specified according to which one of the difference .DELTA.PMa and the difference .DELTA.PMb is larger.

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First Claim