US3901207A - Carburetor control safety - Google Patents

Carburetor control safety Download PDF

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Publication number
US3901207A
US3901207A US361806A US36180673A US3901207A US 3901207 A US3901207 A US 3901207A US 361806 A US361806 A US 361806A US 36180673 A US36180673 A US 36180673A US 3901207 A US3901207 A US 3901207A
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US
United States
Prior art keywords
carburetor
lever
biasing
movable stop
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US361806A
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English (en)
Inventor
Jacques Remaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SA
Original Assignee
Renault SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SA filed Critical Renault SA
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Publication of US3901207A publication Critical patent/US3901207A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0255—Arrangements; Control features; Details thereof with means for correcting throttle position, e.g. throttle cable of variable length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0271—Arrangements; Control features; Details thereof with means for closing the throttle other than throttle closing springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0277—Fail-safe mechanisms, e.g. with limp-home feature, to close throttle if actuator fails, or if control cable sticks or breaks

Definitions

  • ABSTRACT Safety device for controlling a carburetor, of the type comprising means for detecting the pressure exerted by the drivers foot on the accelerator pedal and means for controlling the carburetor throttle valve, wherein a first two-armed and pivoted lever has one arm connected at one end to a control cable sliding in a sheath provided with a fixed stop at one end and with a movable stop at the opposite end, said movable stop being constantly urged towards the carburetor by [58] Field of Search 23/198 D 198 DB, 198 R an auxiliary spring, against the retaining action of a member adapted to be released automatically by References Clted means sensing a possible jamming of said first lever,
  • the present invention relates to a safety device becoming operative in case the control member of a carburettor becomes locked in the engine acceleration position, for restoring the engine to its idling condition or stopping the engine completely.
  • lt is the primary object of the present invention to avoid this inconvenience by providing a device comprising a twoarmed fulcrumed lever having a first arm operatively connected to one end of a control cable movable in a sheath comprising a fixed stop and a movable stop urged towards the carburetor by an auxiliary spring against a retaining device'the action of which is neutralized automatically by means adapted to sense a possible locking or jamming of said lever when no pressure is exerted on the acceleratorpedal, whereby the control cable moves towards'the throttle control lever which can rotate to the idling position under the combined action of a spiral spring and of a main spring.
  • the safety device of the present invention is further characterised by the following features: 7
  • its pressure sensor comprises a pair of switches, namely a first switch associated with the accelerator pedal and adapted to close the circuit under the force of a return spring against the pressure exerted on said pedal, and a second switch carried by the first arm of a two-armed lever fulcrumed to a pivot point and having its other arm rigid with said pedal, said second switch being adapted to close the circuit under the force of a return spring against the action exerted by the first lever arm; its throttle-opening device com-.
  • the electromagnet energizing circuit adapted to be closed under the combined action of switch means comprises a delay action deviceproviding a retard response of the order of 0.6 second..
  • the safety device isfurther characterised by the followingfeatures
  • the throttle opening device comprises a lever fulcrumed at an intermediate point and secured to the pedal at one end while its opposite end is connected to a cable extending through a sheath comprising a fixed stop and a movable stop rigid with another lever fulcrumed at one end urged at one end at an intermediate point by a spring against the action of a cable attached to the movable end wall of a pressure-responsive bellows having in its opposite fixed end wall an inlet port connected to a conduit opening in turn into another conduit and also into the conduit connected to the induction manifold or'pi'pe of the e n gine, said cable being connected to the lever tending to rotate the throttle to its idling position by the
  • a conduit comprising in series a jet and a non-return valve is provided.
  • FIG. 1 illustrates the control circuit connecting the acceleration pedal to the carburetor and comprising a cable sheath stop responsive to an electromagnet
  • FIG. 2 is a similar view wherein the cable sheath stop is responsive to a pneumatic capsule or bellows.
  • the sheath 1 in which the cable 2 is slidably mounted is attached near the carburetor 3 to a first stop 4 hereinafter referred to as the movable sheath stop, which is rigid with one arm 5 of a lever fulcrumed to a pivot pin 6.
  • the sheath 1 is attached to a fixed stop 7 adjacent the accelerator pedal 8.
  • the cable 2 is attached by one end to the end 9 of a two-armed lever 10 fulcrumed at 11.
  • the accelerator pedal 8 fulcrumed at 12 comprises at its lower portion a switch 13 having a push member 13a rigid with a contact-making disc 14 urged by a spring 15 towards a pair of contact studs 16 and 17 inserted in a conductor 18 connected at one end to the ground and at the other end to the negative terminal of the coil of an electromagnet 19.
  • Another switch 20 responsive to the upper portion of lever 10 has the disc 21 of its push member 20a urged by a spring 22 towards the contact studs 23 and 24.
  • the lever 5 is attracted towards the carburetor 3 by an auxiliary or additional spring 25 and its end 26 is adapted to be retained by the end 27 of the arm of lever 28 fulcrumed at 28a and responsive to a push member 30.
  • the wire 18 is adapted to energize the electromagnet 19 having its positive terminal connected to the terminal of a battery, and in its gap a core rigid with said push member 30.
  • the butterfly throttle (not shown) of the carburetor 3 is connected to a lever 31 urged by a spiral spring 32 and a main spring 33 for rotation in the clockwise direction towards its idling position.
  • the cable 2 has its other end attached to the end of lever 31.
  • a delay-action relay 35 is inserted in the circuit of wire 18 before the junction of this wire with the electromagnet 19.
  • the safety feature consists in releasing the movable stop 4 of sheath 1 whereby the sheath and cable assembly 1, 2 is restored to the left, as seen in the figure, by the main spring 33 and the additional spring 25 attached to the movable stop 4 (as in case ofjamming of the cable 2 in its sheath 1 or in case ofjamming of the pivotal mounting of the accelerator pedal proper).
  • This leftward movement of the sheath and cable assembly provides a stroke sufficient for restoring the carburetor throttle to its idling position.
  • the light spiral Spring 32 associated with the shaft of the carburettor throttle valve is sufficient for restoring the latter to its closed or idling position in case of breakage of the cable 2 or the main spring 33.
  • a faulty operation is detected by the selective pedal 8 provided with a switch 13 adapted to open its contact immediately when the driver's foot actuates the pedal.
  • the other switch 20 is a limit switch preventing any actuation of the safety device when the engine is idling, without exerting any action on said selective pedal 8.
  • the above-described safety device operates as follows:
  • the core 19a by means of its push member 30, rotates the cranked lever 28 in the clockwise direction to release the arm 5, so that this arm is urged to the left by its additional spring 25, assisted or not by the main spring 33, this movement being followed by the sheath and cable assembly 1, 2, so that the carburetor throttle valve can be closed by the spiral spring 32 (assisted or not by the main spring 33).
  • switch 13 When the engine is idling and the pedal 8 is depressed, switch 13 is closed but the limit switch is open (as shown in FIG. 1) and the safety device cannot be released.
  • relay 35 The function of relay 35 is to provide a retard of the order of 0.6 second to avoid any untimely or undesired operation of the device as may be caused by a sudden release of the accelerator pedal.
  • the device After a release operated by the energization of a plunger-core type electromagnet, the device must be reset.
  • the main spring 33 is sufficient for returning the pedal 8 by causing the cable 2 to slide in its sheath 1, and constitutes the normal control member ofa carburetor In case of breakage of the additional spring 25, the main spring is sufficient for returning the complete assembly (comprising lever 5 and throttle control lever 31) to the idling position.
  • the spiral spring 32 is sufiicient for restoring the carburetor throttle valve to its idling position in case of untimely operation of the device as a consequence of the breakage of the main spring 33; the spiral spring 32 is not strong enough to restore the pedal 8 by causing the cable 2 to slide in its sheath 1, but when the cable and sheath assembly has been released, the force of spring 32 is sufficient for restoring the carburetor throttle valve to its idling position.
  • the lever 5 is connected at 36 via a small cable 37 to the movable end wall 38 of a pressure-responsive capsule or bellows 39 having formed in its fixed end wall 40 a port 41 connected to one end of a conduit 42 having its other end connected to the induction manifold 44 of the engine (not shown). More particularly, this conduit 42 is connected to a branch conduit 43 leading to the induction manifold 44 and havinginserted therein a non-return valve 45 and a jet 46. Another branch section 47 of conduit 43 leads into a valve chamber or hollow body 48 of a small valve having its valve member adapted, when depressed by the accelerator pedal 8 through the valve stem or push-rod 130a, to engage its seat 50, thus closing the port normally connecting the valve chamber 48 to the surrounding atmosphere via a pipe 51.
  • the vacuum thus created in the capsule or bellows 39 will urge the lever 5 with force against a bearing surface or stop 5a.
  • the cable 2 opens the throttle valve, the small valve 130 is closed and due to the suction prevailing in the induction manifold 44a vacuum is created in the capsule 39, so that its volume is reduced and the lever 5 is pulled by the cable 37.
  • the safety device is again ready to operate as such, i.e. in case the cable 2 remained jammed or locked after the accelerator pedal 8 has been released.
  • a throttling device or jet 46 is provided for limiting the air flow when the valve 140 associated with the pedal 8 is open.
  • a fluid-tight non-return valve 45 enables the vacuum created in the capsule 39 to preserve a sufficient value, for example when driving on relatively long distance at high speed, for instance on mo torways.
  • the delay action is provided by the loss of pressure produced in the piping.
  • This device is more economical than the preceding one (FIG. 1) and does not require any resetting.
  • a safety device for the control linkage of the carburetor comprising:
  • control cable movable in said sheath, one end por tion of said cable being connected to said first arm and the other end portion of said cable being connected to said means for controlling the throttle valve of the carburetor
  • a releasable retaining member for releasably holding said movable stop against movement toward the carburetor, the holding action of said retaining member being releasable automatically by said means for sensing when it senses the jamming of the cable in the sheath or the jamming of the pivotable movement of said lever when no pressure is exerted on the accelerator pedal and,
  • said means for biasing said movable stop toward the carburetor against the holding action of said retaining member comprises a spring.
  • said means for controlling the throttle valve of the carburetor comprises a throttle lever pivotable about a pivot axis
  • said means for biasing said means for controlling the throttle valve of the carburetor to an engine idling position comprises:
  • a safety device as claimed in claim 1 further comprising:
  • a second lever pivotable about an axis, said movable stop being rigidly connected to said second lever, and said releasable retaining member releasably holds said second lever and thereby releasably holds said movable stop which is rigidly connected to said second lever.
  • a safety device as claimed in claim 1 wherein:
  • said sensing means comprises a first switch and a second switch
  • said first switch being associated with the accelerator pedal
  • an electromagnet having a core movable upon energization of said electromagnet, said electromagnet being energized when said first and second switches are closed,
  • control rod rigidly connected to said core so as to be movable therewith
  • said lever having a second arm rigidly connected to said accelerator pedal
  • said releasable retaining member comprising:
  • a retaining lever pivotable about an axis, one end portion of said retaining lever being movable by said control rod for pivoting said retaining lever about its said axis and the other end portion of said retaining lever being adapted to releasably hold said movable stop against movement toward the carburetor so that when said sensing means senses the jamming of said cable in said sheath or the jamming of the pivotable movement of said lever when no pressure is exerted on the accelerator pedal said first switch and second switch are biased by their respective said biasing means into their closed position, the electromagnet is energized, and the core thereof and the control rod move and said control rod moves said one end portion of said retaining lever and pivots it about its said axis and the other end portion of said retaining lever releases its holding action on said movable stop and said means for biasing said movable stop toward the carburetor moves said movable stop theretoward and said means for biasing said means for controlling the throttle valve of the carburetor to an engine id
  • said means for biasing said first switch into its closed position comprises a spring
  • said means for biasing said second switch into its closed position comprises a spring.
  • a delay-action device is connected to said electromagnet, said delay action device being adapted to delay the operation of the safety device for a time of the order of 0.6 second so as to avoid any untimely or undesired operation of the safety device which may be caused by a sudden release of the accelerator pedal.
  • said sensing means comprises a valve positioned beneath the accelerator pedal, said valve having a chamber vented to atmosphere in an open position thereof,
  • said releasable retaining member comprising a pressure-responsive capsule having a fixed end wall and a movable end, said movable end wall being connected by connecting means to said means for biasing said movable stop toward the carburetor, a port in said fixed end wall, said port being fluidly communicable with said valve chamber and an induction manifold of the engine so that when said valve senses the jamming of said cable in said sheath or 10 the jamming of the pivotable movement of said lever when no pressure is exerted on the accelerator pedal said valve is biased to its open position by its said biasing means and the atmospheric pressure in said valve chamber is fluidly communicated with said pressure-responsive capsule through the port in said fixed end wall and said means for biasing said movable stop toward the carburetor moves said movable stop toward the carburetor and said means for biasing said means for controlling the throttle valve of the carburetor to an engine idling position moves said controlling means to its engine idling
  • said means for biasing said valve into its open position comprises a spring
  • valve chamber has a port therein, and said valve chamber is vented to atmosphere by a conduit connected to the port therein,
  • said connecting means comprises a cable
  • said means for biasing said movable stop toward the carburetor comprises a spring.
  • a conduit fluidly communicates said port with the induction manifold of the engine
  • said non-return valve is positioned in the conduit between the port and said jet.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US361806A 1972-06-01 1973-05-18 Carburetor control safety Expired - Lifetime US3901207A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7219777A FR2188687A6 (enExample) 1972-06-01 1972-06-01

Publications (1)

Publication Number Publication Date
US3901207A true US3901207A (en) 1975-08-26

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ID=9099541

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Application Number Title Priority Date Filing Date
US361806A Expired - Lifetime US3901207A (en) 1972-06-01 1973-05-18 Carburetor control safety

Country Status (5)

Country Link
US (1) US3901207A (enExample)
DE (1) DE2328076A1 (enExample)
FR (1) FR2188687A6 (enExample)
GB (1) GB1427611A (enExample)
IT (1) IT1045351B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530326A (en) * 1983-03-07 1985-07-23 Vdo Adolf Schindling Ag Device for transmitting the set point of a set point adjuster
US20080271547A1 (en) * 2004-06-17 2008-11-06 Hans Ryser Force-Reduced Measuring Method for Traction Drives, Particularly Friction Pulley Drives for Elevators
US20100251989A1 (en) * 2009-04-01 2010-10-07 Daniel Christian Ludwigsen Stuck Throttle Ignition Interrupting Device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2926105A1 (de) * 1979-06-28 1981-01-08 Volkswagenwerk Ag Einrichtung an einer brennkraftmaschine mit einer kraftstoffzumesseinrichtung
GB2210664B (en) * 1987-10-07 1991-11-13 Automotive Products Plc Fuel supply control
SG50352A1 (en) * 1992-09-22 1998-07-20 Henderson Henning M A linear link selectively providing for lost motion

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455573A (en) * 1945-07-07 1948-12-07 Bendix Aviat Corp Signal mechanism
US3132711A (en) * 1963-05-20 1964-05-12 Gen Motors Corp Vehicle speed control
US3695379A (en) * 1970-08-17 1972-10-03 Bernard J Veilleux Ignition safety switch system
US3731663A (en) * 1971-01-08 1973-05-08 Hollins J R Vehicle engine fuel control accelerator override
US3741332A (en) * 1970-12-22 1973-06-26 Aisin Seiki Safety device for motor-vehicle engine-speed governor
US3757758A (en) * 1972-07-24 1973-09-11 Gen Motors Corp Throttle pedal actuated throttle return

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455573A (en) * 1945-07-07 1948-12-07 Bendix Aviat Corp Signal mechanism
US3132711A (en) * 1963-05-20 1964-05-12 Gen Motors Corp Vehicle speed control
US3695379A (en) * 1970-08-17 1972-10-03 Bernard J Veilleux Ignition safety switch system
US3741332A (en) * 1970-12-22 1973-06-26 Aisin Seiki Safety device for motor-vehicle engine-speed governor
US3731663A (en) * 1971-01-08 1973-05-08 Hollins J R Vehicle engine fuel control accelerator override
US3757758A (en) * 1972-07-24 1973-09-11 Gen Motors Corp Throttle pedal actuated throttle return

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530326A (en) * 1983-03-07 1985-07-23 Vdo Adolf Schindling Ag Device for transmitting the set point of a set point adjuster
US20080271547A1 (en) * 2004-06-17 2008-11-06 Hans Ryser Force-Reduced Measuring Method for Traction Drives, Particularly Friction Pulley Drives for Elevators
US7673522B2 (en) * 2004-06-17 2010-03-09 Tuv Rheinland Industrie Service Gmbh Force-reduced measuring method for traction drives, particularly friction pulley drives for elevators
US20100251989A1 (en) * 2009-04-01 2010-10-07 Daniel Christian Ludwigsen Stuck Throttle Ignition Interrupting Device
US8291883B2 (en) * 2009-04-01 2012-10-23 Daniel Christian Ludwigsen Stuck throttle ignition interrupting device

Also Published As

Publication number Publication date
IT1045351B (it) 1980-05-10
DE2328076A1 (de) 1973-12-13
FR2188687A6 (enExample) 1974-01-18
GB1427611A (en) 1976-03-10

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