Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1995-09-05
1997-10-28
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 60285, 123520, F01N 320
Patent
active
056807562
ABSTRACT:
This invention is concerned with a fuel-vapor treatment method and apparatus for an internal combustion engine that do not introduce perturbations in the air/fuel ratio during purge-on or purge-off operations. According to the method and apparatus disclosed herein, a sensor output voltage .alpha. (for example, 4.5 V) is set that indicates a catalyst atmosphere neither rich nor lean, or in other words, at stoichiometry. When the present output voltage of a sub O.sub.2 sensor is greater than .alpha., indicating a rich atmosphere, a purge-off operation which entails enrichment is prohibited and a purge-on operation which entails making the atmosphere lean is allowed. Conversely, when the present output voltage of the sub O.sub.2 sensor is not greater than .alpha., indicating a lean atmosphere, a purge-on operation which entails making the atmosphere lean is prohibited and a purge-off operation which entails enrichment is allowed.
REFERENCES:
patent: 4986070 (1991-01-01), Abe
patent: 5239824 (1993-08-01), Matsumoto
patent: 5245975 (1993-09-01), Ito
patent: 5323751 (1994-06-01), Osanai et al.
Hart Douglas
Toyota Jidosha & Kabushiki Kaisha
LandOfFree
Fuel-vapor treatment method and apparatus for internal combustio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fuel-vapor treatment method and apparatus for internal combustio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel-vapor treatment method and apparatus for internal combustio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1018886