US3880962A — Method and apparatus for varying fuel flow to com…

Claim 1

Independent Claim 256 words

A METHOD OF PROVIDING COMPENSATING FUEL TO AN INTERNAL COMBUSTION ENGINE FROM A CARBURETOR HAVING A BODY, INDUCTION PASSAGE MEANS FORMED THROUGH SAID BODY FOR COMMUNICATING WITH SAID ENGINE, VARIABLE VENTURI MEANS SITUATED WITHIN SAID INDUCTION PASSAGE MEANS, FUEL RESERVOIR MEANS FOR CONTAINING FUEL, FUEL DELIVERY MEANS INCLUDING FUEL METERING MEANS COMMUNICATING BETWEEN THE INTERIOR OF SAID FUEL RESERVOIR MEANS AND SAID INDUCTION PASSAGE MEANS, SAID FUEL METERING MEANS BEING EFFECTIVE TO METER THE RATE OF FUEL FLOW FROM SAID FUEL RESERVOIR MEANS THROUGH SAID VARIABLE VENTURI MEANS, INTO SAID INDUCTION PASSAGE MEANS IN ACCORDANCE WITH THE VOLUME RATE OF AIR FLOW THROUGH SAID VARIABLE VENTURI MEANS, AND AUXILIARY CONDUIT MEANS COMMUNICATING BETWEEN SAID FUEL WITHIN SAID FUEL RESERVOIR MEANS AND SAID INDUCTION PASSAGE MEANS FOR SUPPLYING COMPENSATION FUEL FLOW TO SAID INDUCTION PASSAGE MEANS GENERALLY IN ACCORDANCE WITH SENSED AMBIENT ATMOSPHERIC PRESSURE, COMPRISING THE STEPS OF CREATING A SUBATMOSPHERIC PRESSURE WITHIN SAID AUXILIARY CONDUIT MEANS OF A MAGNITUDE REFLECTIVE OF THE VOLUME RATE OF AIR FLOW THROUGH SAID VARIABLE VENTURI MEANS, AND VARIABLY RESTRICTING THE EFFECTIVE FLOW AREA OF SAID AUXILIARY CONDUIT MEANS GENERALLY IN ACCORDANCE WITH SAID ATMOSPHERIC PRESSURE AS TO MORE NEARLY CLOSE-OFF SAID EFFECTIVE FLOW AREA AS SAID ATMOSPHERIC PRESSURE DECREASES, SAID STEP OF CREATING A SUB-ATMOSPHERIC PRESSURE WITHIN SAID AUXILIARY CONDUIT MEANS COMPRISING THE STEPS OF COMMUNICATING SUBSTANTIALLY VENTURI VACUUM TO SAID AUXILIARY CONDUIT MEANS AND VARIABLY VENTING SUCH COMMUNICATED VACUUM GENERALLY IN ACCORDANCE WITH THE DEGREE TO WHICH SAID VARIABLE VENTURI MEANS IS MOVED TOWARD A MORE NEARLY CLOSED CONDITION.

Claim 2

Independent Claim 256 words

A METHOD OF PROVIDING COMPENSATING FUEL TO AN INTERNAL COMBUSTION ENGINE FROM A CARBURETOR HAVING A BODY, INDUCTION PASSAGE MEANS FORMED THROUGH SAID BODY FOR COMMUNICATING WITH SAID ENGINE, VARIABLE VENTURI MEANS SITUATED WITHIN SAID INDUCTION PASSAGE MEANS, FUEL RESERVOIR MEANS FOR CONTAINING FUEL, FUEL DELIVERY MEANS INCLUDING FUEL METERING MEANS COMMUNICATING BETWEEN THE INTERIOR OF SAID FUEL RESERVOIR MEANS AND SAID INDUCTION PASSAGE MEANS, SAID FUEL METERING MEANS BEING EFFECTIVE TO METER THE RATE OF FUEL FLOW FROM SAID FUEL RESERVOIR MEANS THROUGH SAID VARIABLE VENTURI MEANS, INTO SAID INDUCTION PASSAGE MEANS IN ACCORDANCE WITH THE VOLUME RATE OF AIR FLOW THROUGH SAID VARIABLE VENTURI MEANS, AND AUXILIARY CONDUIT MEANS COMMUNICATING BETWEEN SAID FUEL WITHIN SAID FUEL RESERVOIR MEANS AND SAID INDUCTION PASSAGE MEANS FOR SUPPLYING COMPENSATION FUEL FLOW TO SAID INDUCTION PASSAGE MEANS GENERALLY IN ACCORDANCE WITH SENSED AMBIENT ATMOSPHERIC PRESSURE, COMPRISING THE STEPS OF CREATING A SUBATMOSPHERIC PRESSURE WITHIN SAID AUXILIARY CONDUIT MEANS OF A MAGNITUDE REFLECTIVE OF THE VOLUME RATE OF AIR FLOW THROUGH SAID VARIABLE VENTURI MEANS, AND VARIABLY RESTRICTING THE EFFECTIVE FLOW AREA OF SAID AUXILIARY CONDUIT MEANS GENERALLY IN ACCORDANCE WITH SAID ATMOSPHERIC PRESSURE AS TO MORE NEARLY CLOSE-OFF SAID EFFECTIVE FLOW AREA AS SAID ATMOSPHERIC PRESSURE DECREASES, SAID STEP OF CREATING A SUB-ATMOSPHERIC PRESSURE WITHIN SAID AUXILIARY CONDUIT MEANS COMPRISING THE STEPS OF COMMUNICATING SUBSTANTIALLY VENTURI VACUUM TO SAID AUXILIARY CONDUIT MEANS AND VARIABLY VENTING SUCH COMMUNICATED VACUUM GENERALLY IN ACCORDANCE WITH THE DEGREE TO WHICH SAID VARIABLE VENTURI MEANS IS MOVED TOWARD A MORE NEARLY CLOSED CONDITION.

Claim 3

Dependent Claim 255 words

A carburetor for an internal combustion engine, comprising a carburetor body, induction passage means formed through said body for communication with said engine, variable venturi means situated in said induction passage means effective for defining a variably openable venturi throat, a fuel reservoir, main fuel delivery means including fuel metering means communicating between the interior of said fuel reservoir and said induction passage means, said main fuel metering means being effective to meter the rate of fuel flow from said fuel reservoir through said fuel delivery means and into said induction passage means in accordance with the rate of air flow through said variable venturi means, variable restriction means in combination with auxiliary passage means communicating between the fuel within said fuel reservoir and said induction passage means, said auxiliary passage means communicating with a source of vacuum generated by the flow of air through saiD variably openable venturi throat as to thereby cause a pressure differential across said fuel resulting in the flow of auxiliary fuel through said auxiliary passage means, first additional pressure responsive means operatively connected to said variable restriction means to make said variable restriction means effective to vary generally in accordance with a parameter of ambient atmospheric pressure the rate of flow of said auxiliary fuel through said auxiliary passage means caused in response to the magnitude of said vacuum, and second additional means responsive to the opening and closing of said variably openable venturi throat for varying the effective magnitude of said vacuum communicated to said auxiliary passage means.

Claim 4

Dependent Claim 255 words

A carburetor for an internal combustion engine, comprising a carburetor body, induction passage means formed through said body for communication with said engine, variable venturi means situated in said induction passage means effective for defining a variably openable venturi throat, a fuel reservoir, main fuel delivery means including fuel metering means communicating between the interior of said fuel reservoir and said induction passage means, said main fuel metering means being effective to meter the rate of fuel flow from said fuel reservoir through said fuel delivery means and into said induction passage means in accordance with the rate of air flow through said variable venturi means, variable restriction means in combination with auxiliary passage means communicating between the fuel within said fuel reservoir and said induction passage means, said auxiliary passage means communicating with a source of vacuum generated by the flow of air through saiD variably openable venturi throat as to thereby cause a pressure differential across said fuel resulting in the flow of auxiliary fuel through said auxiliary passage means, first additional pressure responsive means operatively connected to said variable restriction means to make said variable restriction means effective to vary generally in accordance with a parameter of ambient atmospheric pressure the rate of flow of said auxiliary fuel through said auxiliary passage means caused in response to the magnitude of said vacuum, and second additional means responsive to the opening and closing of said variably openable venturi throat for varying the effective magnitude of said vacuum communicated to said auxiliary passage means.

Claim 5

Dependent Claim 33 words

A carburetor according to claim 2 wherein said variable restriction means is situated generally in said auxiliary passage means and comprises aperture means of fixed dimensions cooperating with a variably positionable valving member.

Claim 6

Dependent Claim 24 words

A carburetor according to claim 3 wherein said aperture means of fixed dimensions is situated generally between said induction passage means and said fuel.

Claim 7

Dependent Claim 58 words

A carburetor according to claim 2 wherein said variable restriction means is situated generally in said auxiliary passage means and comprises an aperture of fixed dimensions cooperating with a variably positionable valving member for variably controlling the effective flow area of said aperture, and wherein said first additional pressure responsive means is operatively connected to said valving member.

Claim 8

Dependent Claim 14 words

A carburetor according to claim 5 wherein said pressure responsive means comprises bellows means.

Claim 9

Dependent Claim 29 words

A carburetor according to claim 2 wherein said second additional means comprises variable venting means operatively communicating between said auxiliary passage means and a source of substantially atmospheric pressure.

Claim 10

Dependent Claim 36 words

A carburetor according to claim 7 wherein said venting means comprises fixed aperture means cooperating with movable valving means, said movable valving means being effective to vary the effective flow area of said fixed aperture means.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-04-28	1978-10-28	1979-04-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-04-28	1982-10-28	1983-04-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-04-28	1986-10-28	1987-04-29	$7700.00	Window Closed / Lapsed

Method and apparatus for varying fuel flow to compensate for changes in barometric pressure and altitude

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag