Measuring and testing – Vehicle chassis – Steering
Patent
1994-12-29
1996-04-02
Chilcot, Richard
Measuring and testing
Vehicle chassis
Steering
36443108, G01M 1500
Patent
active
055030084
ABSTRACT:
The present invention relates to a misfire diagnosing apparatus which can accurately diagnose misfire based on reference signal periods from a drank angle sensor, without influence from inter-cylinder mechanical ununiformity and the like.
While the fuel is cut-off, a fluctuation amount .DELTA.TINT occurring over a crank angle of 720.degree., in a reference signal period corresponding to combustion conditions of a learning model cylinder (previously selected from among the plurality of cylinders), is computed and then divided by the number of cylinders n to compute a slope amount X (=.DELTA.TINT
).
Then for each cylinder, a ratio is computed between an actual period TINT.sub.i measured over the crank angle of 720.degree., and a theoretical period which is obtained by adding to a period TINT.sub.0 of a learning model cylinder #1 initially occurring during a crank angle of 720.degree., a product of the slope amount X and a cylinder number "i" counted from the learning model cylinder. Individual cylinder correction coefficients KTINT.sub.i (=TINT.sub.o +i.times.X)/TINT.sub.i) are then set based on this ratio.
The individual cylinder correction coefficients KTINT.sub.i, are then used to correct the actual measured periods TINT.sub.i prior to misfire judgement.
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Chilcot Richard
McCall Eric S.
Unisia Jecs Corporation
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