Air-to-fuel ratio control system for an engine

Patent · Tue Feb 25 04:00:00 EST 1986

OSTI ID:6045823

Nakajima, M; Mase, Y; Tamura, Y

This patent describes an air-to-fuel ratio control system incorporated with a carburetor for supplying fuel into an engine according to the amount of intake air. The system consists of: (a) an oxygen sensor for detecting oxygen concentration in engine exhaust gas and for outputting an oxygen sensor signal; (b) an engine coolant temperature sensor for outputting an engine coolant temperature signal; (c) an intake air temperature sensor for outputting an intake air temperature signal; (d) air-to-fuel ratio control means for correcting the amount of fuel to be supplied to the engine so as to obtain mixture with a stoichiometric mixture ratio in response to the detected oxygen sensor signal in accordance with feedback method when the detected engine coolant temperature or the detected intake air temperature is below each reference value, for increasing the amount of fuel to be supplied to the engine so as to obtain rich mixture irrespective of the oxygen sensor signal for prevention of engine overheat when the detected engine coolant temperature and the detected intake air temperature exceed each reference value, and for outputting a control signal representative of the amount of fuel; and (e) an actuator associated with the carburetor and activated in response to the control signal outputted from the control means.

• Assignee: Nissan Motor Co., Ltd., Yokohama
• Patent Number(s): US 4572135
• OSTI ID: 6045823
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ACTUATORS
CARBURETORS
CONTROL SYSTEMS
COOLANTS
DISPERSIONS
ELEMENTS
ENGINES
EXHAUST GASES
FLUIDS
FUEL SYSTEMS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
METERS
MIXTURES
NONMETALS
OXYGEN
OXYGEN METERS
SIGNALS
THERMOMETERS
WASTES