System for determining deterioration of oxygen concentration sen

Details System for determining deterioration of oxygen concentration sen System for determining deterioration of oxygen concentration sen

1993-11-15

1995-02-21

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204406, 204421, 204425, 204426, G01N 2726

Patent

active

053912829

ABSTRACT:
A system for determining an oxygen concentration sensor deterioration caused when foreign particles has clogged at a slit for introducing exhaust gas of an internal combustion engine to block the same. Since it is found by the inventors that sensor output fluctuates greatly between its maximum and minimum values in a TDC interval as the clogging increases, the deviation between the maximum and minimum is first calculated. The calculated deviation is then compared with a reference value and if it exceeds the reference value, the sensor is presumed to deteriorate. The reference value is varied on engine speed, engine load, or an air/fuel ratio of the engine.

REFERENCES:
patent: 4615787 (1986-10-01), Yamada et al.
patent: 4767520 (1988-08-01), Asakura et al.
patent: 4819602 (1989-04-01), Mieno et al.
patent: 4905652 (1990-03-01), Nakajima et al.

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