Air fuel mixture control apparatus for carbureted internal combustion engines
First Claim
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1. 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.
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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.
49 Citations
10 Claims
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1. Air-fuel mixture control apparatus for an internal combustion engine having an induction pipe and an exhaust pipe the apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification