Engine analysis apparatus

Details Engine analysis apparatus Engine analysis apparatus

1976-08-16

1977-06-21

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

73 23, G01M 1500

Patent

active

040303497

ABSTRACT:
Exhaust gas diagnostic apparatus capable of use on both catalytic converter equipped and non-catalytic converter equipped motor vehicles is disclosed. A fast response oxygen analyzer is coupled with means for differentiating the signal output of the oxygen analyzer. In this manner, both the quantity and rate of change of oxygen in the exhaust gas is made available to apparatus included therein for indicating and/or alarming quantity and rate of change values outside preset limits. The apparatus is particularly directed to the detection of an engine misfire condition. The apparatus disclosed permits diagnosing problems without disconnecting the air injector system (if present) or having a port prior to the catalytic converter. As it alarms on transients, it is independent of the steady state oxygen level.

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

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