Air fuel mixture control apparatus for carbureted internal combustion engines
AssigneeNissan Motor Co., Ltd.
InventorShigeo Aono
Life of this patent
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Abstract
Air-fuel mixture control apparatus for a carbureted internal combustion engine having air bleed and fuel supply passages comprises a detector for sensing pre-combustion data such as engine operating parameters and an exhaust gas sensor for providing post-combustion data. The pre-combustion data is used to control the fuel flow rate, while the post-combustion data controls the passage of air through the air bleed. The pre-combustion data minimize the delay from the instant of disturbance to the engine to the instant at which a response is observed.
Claims10
Air-fuel mixture control apparatus for an internal combustion engine having an induction pipe and an exhaust pipe the apparatus comprising:
- an air-fuel mixing chamber for delivery of a mixture of air and fuel to the induction pipe;
- a source of fuel at atmospheric pressure;
- fuel supply conduit means for delivery of fuel from said source to said mixing chamber;
- air bleed conduit means for delivery of air to said mixing chamber;
- an exhaust composition sensor disposed in the exhaust pipe for detecting the concentration of a composition of the exhaust emissions from the engine to provide a concentration representative signal;
- means for modulating the magnitude of the concentration representative signal in accordance with a predetermined control characteristic to generate a first error correction signal;
- means for detecting an operating parameter of the engine to produce a parameter representative signal;
- means for modulating the magnitude of the parameter representative signal in accordance with a predetermined characteristic as a function of the detected parameter of the engine for generating a second error correction signal;
- a first electromagnetic valve disposed in the air bleed conduit means to control the amount of air delivered to said mixing chamber in response to the first error correction signal;
- and
- a second electromagnetic valve disposed in the fuel supply conduit means to control the amount of fuel delivered to said mixing chamber in response to the second error correction signal.
Dependencies are inferred from the claim text.