Method and apparatus for controlling air-fuel ratio in internal combustion engine

Patent · Tue Dec 09 04:00:00 EST 1986

OSTI ID:7226261

Saito, K; Kohama, T; Egami, T; Saito, T; Takahashi, H; Sato, K

A method is described for controlling the air-fuel ratio in an internal combustion engine comprising the steps of: calculating a base fuel amount in accordance with first predetermined engine operating parameters; determining whether or not the engine is in a transient state; detecting an air-fuel ratio deviation from the optimum air-fuel ratio for each of a plurality of regions. The regions are defined by predetermined ranges of values of a second engine operating parameter, the detecting only occurring when the engine is in a transient state; calculating a transient fuel correction amount in accordance with the detected air-fuel ratio deviation for each region as defined by the second engine operating parameter; and calculating a fuel amount to be supplied to the engine by correcting the base fuel amount in accordance with the calculated transient fuel correction amount.

• Assignee: Nippon Soken, Inc., Nishio
• Patent Number(s): US 4627404
• OSTI ID: 7226261
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AUTOMOTIVE FUELS
COMPUTER CALCULATIONS
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
CORRECTIONS
ENGINES
FUEL-AIR RATIO
FUELS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
OPTIMIZATION
TRANSIENTS