Air fuel ratio control system for an internal combustion engine with an improved open loop mode operation

Patent · Tue Mar 15 04:00:00 EST 1988

OSTI ID:5139607

Hibino, Y; Fukuzawa, T

In an air/fuel ratio control system for an internal combustion engine, the system is described including sensors for sensing engine operational parameters relating to an engine load, an exhaust gas sensor for sensing a concentration of an exhaust gas component of the internal combustion engine, and an air/fuel ratio controller for controlling an air/fuel ratio of a mixture supplied to the engine in response to an output value determined on the basis of signals from the sensor. The system comprises: means connected to the sensors for setting a base value of air/fuel ratio control in response to the engine parameters at intervals of a predetermined time period; means for adjusting the base value in response to a result of comparison between a target air/fuel ratio and a detected air/fuel ratio obtained by an output signal of the exhaust gas sensor to provide the output value; means for calculating correction values to compensate for possible errors of the base value each time the output value is produced; second memory means for storing each calculated value of the correction values in connection with each value of the plurality of engine operational parameters; means for detecting a predetermined operational condition of the internal combustion engine; and means for stopping the adjustment of the base value in response to the output signal of the exhaust gas sensor when the predetermined operational condition is detected, and correcting the base value by a value chosen from the correction values stored in the second memory means to provide the output value.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4730594
• OSTI ID: 5139607
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMBUSTION CONTROL
COMPUTERIZED CONTROL SYSTEMS
CONTROL
CONTROL SYSTEMS
CORRECTIONS
ENGINES
EXHAUST GASES
FLUIDS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
FUNCTIONS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
MEMORY DEVICES
METERING
METERS
OPERATION
RESPONSE FUNCTIONS
WASTES