Measuring and testing – Gas analysis – Gas of combustion
Patent
1997-11-14
1999-10-19
McCall, Eric S.
Measuring and testing
Gas analysis
Gas of combustion
731181, 60276, 123697, F01N 300
Patent
active
059692308
ABSTRACT:
A system for estimating the temperature of an oxygen sensor installed in an exhaust system of an engine comprises a section for sensing a load of the engine; a section for sensing a rotation speed of the engine; and a section which, based on both the engine load and the engine rotation speed, calculates a basic estimated temperature of the oxygen sensor which would appear under a normal condition. A section is employed which senses a speed of the vehicle. A section is employed which, based on the vehicle speed, determines a first correction factor for correcting the basic estimated temperature. A section is employed which senses the temperature of outside air. A section is employed which, based on the outside air temperature, determines a second correction factor for correcting the basic estimated temperature. A target estimated temperature calculating section is employed which, based on the basic estimated temperature and the first and second correction factors, calculates a target estimated temperature of the oxygen sensor and issues an output signal representative of the target estimated temperature. A stopper section is further employed which suppresses the target estimated temperature calculating section from issuing the output signal or calculating the target estimated temperature until a predetermined time passes from a time on which energization of the electric heater starts.
REFERENCES:
patent: 4291572 (1981-09-01), Maurer et al.
patent: 4561402 (1985-12-01), Nakano et al.
patent: 5405521 (1995-04-01), Nakamori et al.
patent: 5605040 (1997-02-01), Cullen et al.
patent: 5901553 (1999-05-01), Cullen
Sakai Shoichi
Uchikawa Akira
McCall Eric S.
Unisia Jecs Corporation
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