Air-fuel ration feedback control method for internal combustion engines

Patent · Tue Feb 25 04:00:00 EST 1986

OSTI ID:5761804

Otobe, Y

This patent describes a method of effecting feedback control of the air-fuel ratio of an air-fuel mixture being supplied to an internal combustion engine having an exhaust pipe and an exhaust gas ingredient concentration detecting means arranged in the exhaust pipe. By correcting a basic value of fuel supply quantity by the use of a coefficient variable in value in response to the output of the exhaust gas ingredient concentration detecting means, while the engine is operating in a predetermined air-fuel ratio feedback control region other than an idling region. The method consists of the following steps: (1) determining whether or not the engine is operating in the predetermined air-fuel ratio feedback control region; (2) calculating a mean value of values of the coefficient which have been applied in the feedback control, when the engine is operating in the predetermined air-fuel ratio feedback control region; (3) correcting the calculated mean value of the coefficient obtained at the step (2) by a predetermined value immediately when a transition occurs in the engine operation from a region other than the predetermined air-fuel feedback control region to the latter region; and (4) immediately initiating the air-fuel ration feedback control by the use of the corrected mean value of the coefficient as an initial value.

• Assignee: Honda Giken Kogyo K.K., Tokyo
• Patent Number(s): US 4572129
• OSTI ID: 5761804
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
DISPERSIONS
ENGINES
EXHAUST GASES
EXHAUST SYSTEMS
FEEDBACK
FLUIDS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MIXTURES
PIPES
WASTES