Device for determining misfiring cylinder of multicylinder engin

Details Device for determining misfiring cylinder of multicylinder engin Device for determining misfiring cylinder of multicylinder engin

1992-02-14

1993-09-21

Myracle, Jerry W.

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

052458652

ABSTRACT:
A rotor with outer teeth is fixed to a crankshaft, a crank angle sensor is disposed facing the outer teeth of the rotor, and the angular velocity of the crankshaft in the power stroke of the cylinders is found from the output pulses of the crank angle sensor. In this case, if the ignition sequence is 1-3-4-2, the angular velocities of the crankshaft for the no. 1 cylinder #1 and the no. 4 cylinder #4 are calculated from the output pulses generated based on the outer teeth of the same region I, while the angular velocities of the crankshaft for the no. 3 cylinder #3 and the no. 2 cylinder #2 are calculated from the output pulses generated based on the outer teeth of the same region II. Therefore, even if there is a manufacturing error in the outer teeth of the region I, so long as no misfire occurs, the angular velocities of the crankshaft will be the same for the no. 1 cylinder #1 and the no. 4 cylinder #4. As opposed to this, if a misfire occurs at the no. 1 cylinder #1, the angular velocity of the crankshaft at the power stroke of the no. 1 cylinder #1 will become slower than the angular velocity of the crankshaft at the power stroke of the no. 4 cylinder #4 and therefore it can be detected that the no. 1 cylinder #1 has misfired.

REFERENCES:
patent: 4586369 (1986-05-01), Vogler
patent: 5197325 (1993-03-01), Tamura et al.

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