Sensor and method for detecting misfires in internal combustion

Details Sensor and method for detecting misfires in internal combustion Sensor and method for detecting misfires in internal combustion

1994-01-13

1995-01-24

Williams, Hezron E.

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

731173, 324391, 324402, G01M 1500, F02P 1700

Patent

active

053833503

ABSTRACT:
A sensor (10) detects misfires of combustion cylinders in an internal combustion engine by monitoring the exhaust from the engine. The sensor (10) comprises a spark gap (18) to be situated in exhaust from the engine and a transformer assembly (34). The transformer assembly (34) has an ignition transformer (41a) for providing a potential difference between the electrodes (18a, 18b) of the spark gap (18) and a detection transformer (41b) for sensing the occurrence of an arc across the spark gap (18). An ignition pulse shaper (68) provides an ignition pulse to the ignition transformer (41a) upon receiving a trigger signal from an engine control system (66), and a detection pulse shaper (72) monitors the detection transformer (41b) and forwards an arc detection signal to the engine control system (66) upon detecting an arc across the electrodes (18a, 18b) of the spark gap (18). Proper ignition in the internal combustion engine is presumed when the arc is generated across the electrodes (18a, 18b), and a misfire is presumed in the internal combustion engine in the absence of the arc across the spark gap (18).

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