Cylinder combustion monitoring apparatus

Details Cylinder combustion monitoring apparatus Cylinder combustion monitoring apparatus

1986-10-10

1989-04-11

Lall, Parshotam S.

Boots, shoes, and leggings

123425, 123479, 73 35, F02P 515, F02P 1100

Patent

active

048211940

ABSTRACT:
An apparatus for monitoring cylinder combustion in an internal combustion engine having at least one cylinder to control the engine by employing a pressure sensor sensitive to combustion pressure in the cylinder for producing a sensor signal indicative of a sensed cylinder combustion pressure level. From the sensor signal, there are extracted a knock signal in a predetermined high frequency range and a cylinder combustion pressure signal in a predetermined low frequency range. The apparatus includes an electrical circuit which provides a first indication in response to an abnormal condition of the high frequency knock signal and a second indication in response to an abnormal condition of the low frequency cylinder combustion pressure signal. The circuit provides a failure indication of the sensor signal being unreliable for use in controlling the engine in the presence of the first and/or second indications. The engine is controlled independently of the sensor signal upon occurrence of the failure indication.

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M. Kondo et al., "Isdiscope--A New Combustion Pressure Indicator with Washer Transducers", Society of Automotive Engineers, Inc., 1975.

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