Air-fuel ratio controller for internal combustion engine

Patent · Tue May 12 04:00:00 EDT 1987

OSTI ID:6425980

Takeda, Y; Suematsu, T; Harada, O; Anzai, K

A method is described of controlling an air-fuel ratio for internal combustion engine. The method comprises: calculating a basic fuel injection duration based on an engine load and a rotational speed of the engine; obtaining a factor of air-fuel ratio feedback correction for allowing a fuel injection duration to perform a proportional-plus-integral action, based on an output of an oxygen sensor for detecting a residual oxygen concentration in an exhaust gas; calculating a mean valve of the factor of air-fuel ratio feedback correction; and varying a correction value by learning so that the mean value takes a value within a predetermined range centered at a predetermined value corresponding to a target air-fuel ratio.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Aichi
• Patent Number(s): US 4664086
• OSTI ID: 6425980
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMPUTER CALCULATIONS
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
CORRECTIONS
ELEMENTS
ENGINES
EXHAUST GASES
FEEDBACK
FLUIDS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
METERS
MOTION
NONMETALS
OXYGEN
OXYGEN METERS
ROTATION
VELOCITY
WASTES