Cylinder combustion monitoring apparatus
An apparatus is described for monitoring cylinder combustion in an internal combustion engine having at least one cylinder to control the engine, comprising: sensor means sensitive to combustion pressure in the cylinder for providing a sensor signal indicative of a sensed cylinder combustion pressure level; means coupled through a signal line to the sensor means for extracting, from the sensor signal, a knock signal in a predetermined high frequency range and a cylinder combustion pressure signal in a predetermined low frequency range; a circuit responsive to the high frequency knock signal and the low frequency cylinder combustion pressure signal for providing a failure indication of the sensor signal being unreliable; and means responsive to the failure indication for controlling the engine independently of the sensor signal.
- Assignee:
- Nissan Motor Co., Limited, Yokohama
- Patent Number(s):
- US 4821194
- OSTI ID:
- 5977102
- Country of Publication:
- United States
- Language:
- English
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