Method and apparatus for controlling air-fuel ration in internal combustion engine
Patent
·
OSTI ID:6879829
A method is described for controlling the air-fuel ratio in an internal combustion engine having a throttle valve within an intake air passage thereof, and lean mixture sensor means for generating a signal in accordance with a concentration of a specific composition in the exhaust gas. The signal changes in value as an atmospheric pressure around the lean mixture sensor is changed. The method comprises: calculating a reference signal value in accordance with predetermined parameters of the engine; detecting an atmospheric pressure; correcting the calculated reference signal value in accordance with the detected atmospheric pressure; and controlling the feedback of the air-fuel ratio so that the signal is brought close to the corrected reference signal value. An apparatus is described for controlling the air-fuel ratio in an internal combustion engine, comprising: a throttle valve within an intake air passage thereof; lean mixture sensor means for generating a signal in accordance with a concentration of a specific composition in the exhaust gas, the signal changing in value as an atmospheric pressure around the lean mixture sensor means is changed; and means for calculating a reference signal value in accordance with predetermined parameters of the engine.
- Assignee:
- Toyota Jidosha Kabushiki Kaisha, Toyota
- Patent Number(s):
- US 4651700
- OSTI ID:
- 6879829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AIR FLOW
ATMOSPHERIC PRESSURE
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DISPERSIONS
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST SYSTEMS
FEEDBACK
FLOW REGULATORS
FLUID FLOW
FLUIDS
FUEL-AIR RATIO
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MECHANICAL STRUCTURES
MIXTURES
SIGNALS
VALVES
WASTES
330100* -- Internal Combustion Engines
AIR FLOW
ATMOSPHERIC PRESSURE
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DISPERSIONS
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST SYSTEMS
FEEDBACK
FLOW REGULATORS
FLUID FLOW
FLUIDS
FUEL-AIR RATIO
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MECHANICAL STRUCTURES
MIXTURES
SIGNALS
VALVES
WASTES