Control method of controlling an air/fuel ratio control system in an internal combustion engine

Patent · Tue Aug 23 04:00:00 EDT 1988

OSTI ID:6526278

Hibino, Y; Fukuzawa, T; Totsune, A

This patent describes a control method for controlling an air/fuel ratio control system in an internal combustion engine comprising the steps of: setting a base air/fuel ratio control value in accordance with parameters of the engine operation relating to the load on the engine; setting an operational air/fuel ratio control value corresponding to a target air/fuel by correcting a set value of the base value in response to an output signal of an oxygen concentration sensor disposed in an exhaust gas passage of the internal combustion engine; controlling the air/fuel ratio of the mixture to be supplied to the internal combustion engine according to the operational air/fuel ration control value; setting a correction value indicative of an error caused by the lapse of time due to deterioration of the oxygen concentration sensor or to the carburetor of the internal combustion engine; detecting continuation of a light load operation of the internal combustion engine for more than a predetermined period; and selecting, as the air/fuel ration control value, an open loop control value by which the air/fuel ratio of the mixture can be controlled around the target air/fuel ratio.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4765305
• OSTI ID: 6526278
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
CONTROL SYSTEMS
CORRECTIONS
DESIGN
ENGINES
EXHAUST SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
METERING
OPERATION