초록 ▼

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.

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.

대표청구항 ▼

An apparatus for monitoring cylinder combustion in an internal combustion engine having at least one cylinder to control said engine, comprising: sensor means sensitive to combustion pressure in said cylinder for providing a sensor signal indicative of a sensed cylinder combustion pressure level; me

An apparatus for monitoring cylinder combustion in an internal combustion engine having at least one cylinder to control said engine, comprising: sensor means sensitive to combustion pressure in said cylinder for providing a sensor signal indicative of a sensed cylinder combustion pressure level; means coupled through a signal line to said sensor means for extracting, from said 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 said high frequency knock signal and said low frequency cylinder combustion pressure signal for providing a failure indication of said sensor signal being unreliable for use in controlling said engine, said circuit including first decision means responsive to an abnormal condition of said high frequency knock signal for providing a first indication, second decision means responsive to an abnormal condition of said low frequency cylinder combustion pressure signal for providing a second indication, and means for providing said failure indication based upon said first and second indications; and means responsive to said failure indication for controlling said engine independently of said sensor signal.