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A carbureting type fuel metering apparatus has an induction passage into which fuel is fed by several fuel metering systems among which are a main fuel metering system and an idle-fuel metering system, as generally known in the art; electrical circuit means responsive to signals produced by associat

A carbureting type fuel metering apparatus has an induction passage into which fuel is fed by several fuel metering systems among which are a main fuel metering system and an idle-fuel metering system, as generally known in the art; electrical circuit means responsive to signals produced by associated engine exhaust gas analyzing means sensitive to selected constituents of such exhaust gas and also responsive to other selected indicia of vehicle and/or engine operating conditions, creates feedback signal means which through associated transducer means become effective for controllably modulating the metering characteristics of the main fuel metering system and the idle fuel metering system.

대표청구항 ▼

A carburetor for a combustion engine, comprising induction passage means for supplying motive fluid to said engine, a source of fuel, main fuel metering system means communicating generally between said source of fuel and said induction passage means, idle fuel metering system means communicating ge

A carburetor for a combustion engine, comprising induction passage means for supplying motive fluid to said engine, a source of fuel, main fuel metering system means communicating generally between said source of fuel and said induction passage means, idle fuel metering system means communicating generally between said source of fuel and said induction passage means, selectively controlled modulating valving means effective to controllably alter the rate of metered fuel flow through each of said main fuel metering system means and said idle fuel metering system means, and electrical circuit means effective for sensing the oxygen content within the exhaust gases of said engine and in response thereto controlling said valving means, said electrical circuit means comprising oxygen sensor means effective for sensing the relative amount of said oxygen in said exhaust gases and producing in response thereto an electrical output signal, means for comparing said output signal to a preselected reference value, amplifier means for amplifying any difference as between said preselected value and said output signal and for producing an electrical control signal effective for controlling said modulating valving means, said amplifier means comprising lag and attenuation circuit means effective for stabilizing fluctuations occurring in said output signal. An electrical circuit for controlling the energization of first and second solenoid coils in response to an electrical operating signal of variable magnitude, comprising first, second, third, fourth and fifth operational amplifier means, first and second transistor means comprising first Darlington circuit means, third and fourth transistor means comprising second Darlington circuit means, first and second voltage divider means, said first amplifier means being effective to receive said operating signal and to produce a first electrical output signal of a magnitude reflective of the magnitude of said operating signal, first terminal means associated with said second amplifier means and effective for receiving said first electrical output signal, second terminal means associated with said third amplifier means and effective for receiving said first electrical output signal, third terminal means associated with said second amplifier means and effectively connected to said first voltage divider means as to thereby establish a first reference magnitude for said second amplifier means, fourth terminal means associated with said third amplifier means and effectively connected to said second voltage divider means as to thereby establish a second reference magnitude for said second amplifier means, fifth terminal means associated with said second amplifier means for producing a first amplified output signal indicative of the difference in magnitudes between said first electrical output signal and said first reference magnitude, sixth terminal means associated with said fourth amplifier means and effective to receive said first amplified output signal, seventh terminal means associated with said fourth amplifier means for producing a second output signal, first base electrode means associated with said first Darlington circuit means for receiving said second output signal and in response thereto causing an output collector-emitter of said first Darlington circuit means to energize said first solenoid coil through first conductor means, eighth terminal means associated with said fourth amplifier means and electrically connected to said first conductor means, nineth terminal means associated with said third amplifier means for producing a second amplified output signal indicative of the difference in magnitudes between said first electrical output signal and said second reference magnitude, tenth terminal means associated with said fifth amplifier means and effective to receive said second amplified output signal, eleventh terminal means associated with said fifth amplifier means for producing a third output signal, second base electrode means associated with said second Darlington circuit means for receiving said third output signal and in response thereto causing an output collector-emitter of said second Darlington to energize said second solenoid coil through second conductor means, twelveth terminal means associated with said fifth amplifier means and electrically connected to said second conductor means, and attentuating circuit means associated with each of said second and third operational amplifier means effective to cause said first and second amplified output signals to be attenuated with respect to said differences, respectively.