Misfire monitor for engine analysis having automatic rescaling

Details Misfire monitor for engine analysis having automatic rescaling Misfire monitor for engine analysis having automatic rescaling

1976-08-16

1977-06-28

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

73 23, G01M 1500

Patent

active

040317471

ABSTRACT:
An improvement to a misfire monitor sensing lean-roll in an internal combustion engine by comparing the rate of change in O.sub.2 in the exhaust gases with respect to time against a limit is disclosed. In the preferred embodiment, the sensed O.sub.2 level in the exhaust is used as an input to rescaling means which automatically normalizes the values used in the comparison to a standard range. Normalization is accomplished alternately by rescaling the rate of change value, rescaling the limit value used, or diluting the exhaust gases sampled to the level of a "standard" air blown engine to which the comparison limit is scaled.

REFERENCES:
patent: 3938479 (1976-02-01), Oberstadt
patent: 3969932 (1976-07-01), Rieger et al.

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