Method and apparatus for detecting cylinder misfire in an intern

Details Method and apparatus for detecting cylinder misfire in an intern Method and apparatus for detecting cylinder misfire in an intern

1993-04-05

1994-06-21

Raevis, Robert

Measuring and testing

Test stand

For engine

G01M 1500

Patent

active

053219783

ABSTRACT:
Provided is a method and circuit for detecting cylinder misfire in an internal combustion engine having an ignition system including an ignition device, an ignition coil having a primary and a secondary winding, and a pair of spark plugs having respective gaps. As disclosed, the circuit is operative to separate spark current and ionization current to improve detection of cylinder misfire. The circuit includes power supply means for supplying voltage to the circuit to generate ion current across the spark plug gaps and voltage limiting means for isolating said power supply means from said ignition coil. There is also included negative voltage clamping means in electrical contact with the ignition coil secondary winding for clamping selected negative voltages generated during ignition.

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