Measuring and testing – Vehicle chassis – Steering
Patent
1991-06-04
1993-03-30
Myracle, Jerry W.
Measuring and testing
Vehicle chassis
Steering
G01M 1500
Patent
active
051973251
ABSTRACT:
An engine misfiring detection system includes a crank angle sensor for generating a reference pulse representative of a reference crank angle position in each cylinder of the engine, and a ring gear sensor for monitoring a magnitude of crank angle rotated from the reference crank angle position so as to define a first crank angle position required for starting an angular velocity measurement for an engine crankshaft and a second crank angle position required for ending the angular velocity measurement. A controller is provided to determine an engine misfiring state on the basis of fluctuations in a measuring time reaching from the first crank angle position to the second crank angle position. The controller variably sets the first and second crank angle positions in response to changes in an ignition timing of the engine. The controller determines a tooth defect in the ring gear on the basis of a ratio of said measuring time and a time interval necessary to reach from the reference crank angle position in relation to a firing cylinder to the reference crank angle position in relation to the subsequent cylinder.
REFERENCES:
patent: 4697561 (1987-10-01), Citron
patent: 4782692 (1988-11-01), Peden et al.
Aramaki Takashi
Tamura Hideyuki
Myracle Jerry W.
Nissan Motor Company Limited
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