Measuring and testing – Simulating operating condition – Marine
Patent
1994-07-29
1995-10-03
Chilcot, Jr., Richard E.
Measuring and testing
Simulating operating condition
Marine
73 2332, F02M 31135
Patent
active
054542596
ABSTRACT:
A plurality of air-fuel ratio sensors having a temperature characteristic are disposed in an exhaust passage in an engine, with heaters respectively provided in the sensors. The heaters generate heat when energized. An electronic control unit controls the energization of each heater in accordance with the driving conditions of the engine and the temperature condition of the exhaust passage, thereby controlling the amount of generated heat of each heater. As a result, the temperature of each sensor is controlled. When driving conditions allow an interruption to the energization of the individual heaters, the electronic control unit forcibly stops the energization of all the heaters for a predetermined period of time regardless of the energizing status of each heater. Thereafter, the electronic control unit restarts the energization of the heaters one after another, compares the value of the current flowing through each heater in the energizing state with a reference value, and determines the deterioration of the performance of each heater based on the comparison result.
REFERENCES:
patent: 4150562 (1979-04-01), Nielsen
patent: 4344317 (1982-08-01), Hattori et al.
patent: 4348732 (1982-09-01), Kreft
patent: 4389881 (1983-06-01), Butler et al.
patent: 4535316 (1985-08-01), Wertheimer et al.
patent: 4561402 (1985-12-01), Nakano et al.
patent: 4611562 (1986-09-01), Nakano et al.
patent: 4715343 (1987-12-01), Kinoshita
patent: 4803866 (1989-02-01), Miki et al.
patent: 4938196 (1990-07-01), Hoshi et al.
patent: 4993392 (1991-02-01), Tanaka et al.
patent: 5218946 (1993-06-01), Wild et al.
patent: 5245979 (1993-09-01), Pursiful et al.
patent: 5279145 (1994-01-01), Suzuki
patent: 5285762 (1994-02-01), Werner et al.
patent: 5327780 (1994-07-01), Entenmann et al.
Akatsuka Takao
Ishii Satoshi
Chilcot Jr. Richard E.
McCall Eric S.
Toyota Jidosha & Kabushiki Kaisha
LandOfFree
Failure detecting apparatus in temperature controller of air-fue does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Failure detecting apparatus in temperature controller of air-fue, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Failure detecting apparatus in temperature controller of air-fue will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1071657