Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1996-10-25
1997-12-30
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
F02D 4100, F02M 2300, F02M 2500
Patent
active
057018774
ABSTRACT:
This invention provides a heater controller applied to an air-fuel ratio sensor to prevent a temperature of the sensor excessively rising or the heater installed in the sensor breaking down, when a failed sensor is replaced with a new sensor without clearing a memory which stores a resistance of the heater of the failed sensor. A resistance of the heater for heating the sensor is calculated, and is stored as a stored resistance in a back up memory. When a failed sensor is replaced with a new sensor having a lower resistance than that of the heater installed in the failed sensor without clearing the memory, an electric power supplied to the heater is increased in accordance with a current resistance of the new heater and the stored resistance of the failed heater. However, the increased electric power is limited within a interval determined by an engine operating condition.
REFERENCES:
patent: 4694809 (1987-09-01), Nakano et al.
patent: 4708777 (1987-11-01), Kuraoka
patent: 4938196 (1990-07-01), Hoshi et al.
patent: 5111792 (1992-05-01), Nagai et al.
patent: 5148795 (1992-09-01), Nagai et al.
patent: 5353775 (1994-10-01), Yamashita et al.
Nelli Raymond A.
Toyota Jidosha & Kabushiki Kaisha
LandOfFree
Heater controller for an air-fuel ratio sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Heater controller for an air-fuel ratio sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heater controller for an air-fuel ratio sensor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-194562