Failsafe device for air/fuel ratio feedback control system

Patent · Tue Nov 15 00:00:00 EST 1983

OSTI ID:5309959

Otsuka, K; Hasegawa, S; Narasaka, S

A fail safe device is disclosed, comprising means for detecting a failure in an air/fuel ratio feedback control system and generating a fault signal when such failure is detected, and means responsive to the fault signal to drive an actuator for driving an air/fuel ratio control valve and also responsive to a reference position signal supplied thereto during the above driving, which is generated when the actuator passes its reference position, to stop the actuator at the reference position. The actuator driving/stopping means may comprise means for repeatedly driving the actuator over a predetermined operating range inclusive of the reference position a plurality of times when it is not supplied with the reference position signal upon the actuator passing the reference position, and means for driving the actuator from its extreme operating position to a predetermined position and holding the same there when it is not supplied with the reference position signal even after a predetermined number of times of the above repeated driving of the actuator.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha (Japan)
• Patent Number(s): US 4414950
• OSTI ID: 5309959
• Resource Relation: Patent Priority Date: Priority date 6 Oct 1980, Japan; Other Information: PAT-APPL-307445
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
FUEL SYSTEMS
CONTROL SYSTEMS
INTERNAL COMBUSTION ENGINES
ACTUATORS
DETECTION
EXHAUST GASES
FAILURES
FEEDBACK
FUEL-AIR RATIO
OXYGEN
ELEMENTS
ENGINES
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
NONMETALS
WASTES
330100* - Internal Combustion Engines
330700 - Advanced Propulsion Systems- Emission Control