Method of diagnosing the efficiency of an exhaust gas stoichiome

Details Method of diagnosing the efficiency of an exhaust gas stoichiome Method of diagnosing the efficiency of an exhaust gas stoichiome

1997-03-12

1999-09-28

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60285, 123688, F01N 300

Patent

active

059569433

ABSTRACT:
The method of diagnosis determines the state of deterioration of an exhaust gas stoichiometric composition sensor placed downstream of a catalytic converter. The catalytic converter is mounted on an exhaust manifold of an internal combustion engine supplied with an air/fuel mixture, while the sensor generates an output signal correlated with the stoichiometric composition of the mixture. The method comprises the phases of registering a temperature signal correlated with the temperature of the engine; determining the operating range of the engine; determining the stoichiometric composition of the air/fuel mixture; and effecting a hot diagnosis should the temperature signal be greater than a preset reference value, the engine be in the idle operating range and the sensor register a weak stoichiometric composition of the mixture. The hot diagnosis comprises the phases of generating control signals for the engine and of gauging the output signal from the sensor.

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EPO "Communication", Partial Search Report Jul. 3, 1997 4 pages.
EPO "Communication" Search Report Nov. 12, 1997 5 pages.

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