Method for testing correctly connected lambda sensors

Details Method for testing correctly connected lambda sensors Method for testing correctly connected lambda sensors

1998-02-19

2000-07-25

Oen, William

Measuring and testing

Simulating operating condition

Marine

G01M 1900

Patent

active

060924136

ABSTRACT:
The invention provides a method of checking for correct connection of lambda sensors in an internal combustion engine with one or more cylinder groups that incorporates an engine control and a plurality of lambda sensors, with a separate exhaust line with an exhaust catalytic converter and at least one lambda sensor with a lambda-regulating unit connected thereto being associated with each group of cylinders. While retaining the injection of an ignitable mixture at the beginning of a delay time that includes at least the reaction or switching time of the lambda sensors in its current regulating state, the engine control adjusts the lambda-regulating unit of at least one cylinder group, toward rich or lean engine operation and/or suspends its regulating function during the delay. The signal from the lambda sensor intended for use with the selected cylinder group is investigated to determine whether it shows a reaction that is associated with the manipulation performed and indicates a correct connection of this lambda sensor.

REFERENCES:
patent: 4167163 (1979-09-01), Muder
patent: 4980834 (1990-12-01), Ikeda et al.
patent: 5212947 (1993-05-01), Fujimoto et al.
patent: 5305727 (1994-04-01), Gopp
patent: 5390650 (1995-02-01), Gee et al.
patent: 5417099 (1995-05-01), Ohuchi

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