Abnormality determination device of cylinder pressure sensor

Details Abnormality determination device of cylinder pressure sensor Abnormality determination device of cylinder pressure sensor

2007-05-29

2009-06-02

Tsai, Carol S (Department: 2857)

Data processing: measuring, calibrating, or testing

Calibration or correction system

Signal frequency or phase correction

C073S001590, C073S035050, C073S118040, C123S406480, C123S435000, C701S114000, C701S108000

Reexamination Certificate

active

07542865

ABSTRACT:
An abnormality determination device of a cylinder pressure sensor calculates a gain (sensing sensitivity coefficient) and an offset (bias) indicating an output characteristic of the cylinder pressure sensor. The device determines existence or nonexistence of an abnormality in the gain and the offset respectively. When the device determines that the abnormality exists, the device performs failsafe processing set in modes different from each other between the case of the abnormality in the gain and the case of the abnormality in the offset. As the failsafe processing in the case of the abnormality in the gain, the device performs processing for substantially prohibiting usage of a sensor value of the cylinder pressure sensor in control (fuel injection timing control) by using an alternative value (specified value) instead of the sensor value of the cylinder pressure sensor.

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