EP0257654B1 - Leerlaufdrehzahlregelvorrichtung - Google Patents

Leerlaufdrehzahlregelvorrichtung Download PDF

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Publication number
EP0257654B1
EP0257654B1 EP19870112549 EP87112549A EP0257654B1 EP 0257654 B1 EP0257654 B1 EP 0257654B1 EP 19870112549 EP19870112549 EP 19870112549 EP 87112549 A EP87112549 A EP 87112549A EP 0257654 B1 EP0257654 B1 EP 0257654B1
Authority
EP
European Patent Office
Prior art keywords
fuel
idling
throttle
cut
opening
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
Application number
EP19870112549
Other languages
English (en)
French (fr)
Other versions
EP0257654A2 (de
EP0257654A3 (en
Inventor
Minoru Doi
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.)
Suzuki Motor Corp
Original Assignee
Suzuki Motor Corp
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 Suzuki Motor Corp filed Critical Suzuki Motor Corp
Publication of EP0257654A2 publication Critical patent/EP0257654A2/de
Publication of EP0257654A3 publication Critical patent/EP0257654A3/en
Application granted granted Critical
Publication of EP0257654B1 publication Critical patent/EP0257654B1/de
Expired 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M3/00—Idling devices for carburettors
    • F02M3/06—Increasing idling speed
    • F02M3/07—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M3/00—Idling devices for carburettors
    • F02M3/02—Preventing flow of idling fuel
    • F02M3/04—Preventing flow of idling fuel under conditions where engine is driven instead of driving, e.g. driven by vehicle running down hill
    • F02M3/045—Control of valves situated in the idling nozzle system, or the passage system, by electrical means or by a combination of electrical means with fluidic or mechanical means

Definitions

  • the invention relates to an idling-up controller according to the preamble of claim 1.
  • US-A-4 008 696 discloses a carburetor for optimum control of an air-fuel mixture supply to the engine during deceleration, according to which addition of most fuel is electrically prevented during breaking by the engine at a high engine speed. Below a certain engine speed, the electric signal is stopped and a vacuum-operated valve allows additional air-fuel mixture to enter the engine, even though the throttle valves are closed.
  • the idling engine speed is set to be low in order to clarify exhaust gases and reduce fuel consumption.
  • the idling engine speed is low, even a slight increase in the load of the engine results in a reduction in the rotational speed of the engine and, hence, malfunction of the engine. For instance, an increase in the electrical load due to headlamps or the like being switched on reduces the rotational speed of the engine, resulting in malfunction of the engine. If cooling water for cooling the engine is circulated through a heat exchanger when the occupant wishes to use the heater in cold weather, the warming-up operation cannot be performed adequately since the rotational speed of the engine is low.
  • a type of idling-up controller has been proposed in which a throttle valve of the carburetor is maintained at a set idle-opening so as to compensate for any reduction in the rotational speed of the engine when an electrical load such as that mentioned above is applied.
  • the throttle opening is adjusted by an idling-up controlling screw at the time of idling-up control operation as shown in US-A- 4 060 063.
  • This type of idling-up controller lacks any throttle-opening switch for limiting the throttle opening. If the throttle opening is accidentally set at an excess setting by the idling-up adjusting screw, the degree of idling-up exceeds a desired throttle opening at which the fuel-cut operation starts. Therefore, the fuel-cut operation is not performed even when the engine is in a state which requires a fuel-cut (for example, in a deceleration range), thus hindering the fuel-cut operation.
  • the idling-up controller has an idling-up control mechanism and a fuel-cut control mechanism, in which a second conductor for idling-up control which has an electromagnetic valve for operating an actuator is connected to a first conductor for fuel-cut control which connects a fuel-cut valve of the fuel-cut control mechanism and a throttle-opening switch, and which, by using a detection signal from the throttle-opening switch for fuel-cut control as a signal for limiting the degree of idling-up, is capable of limiting the degree of idling-up when the throttle opening is set at an excess position while ensuring the fuel-cut operation and the prevention of catalyst overheating.
  • an idling-up controller having: an idling-up control mechanism for moving a throttle valve of a carburetor to a predetermined idling-up position by means of an actuator; a fuel-cut mechanism having a fuel-cut valve disposed at an intermediate portion of a slow-system passage of the carburetor, the fuel-cut mechanism being adapted to cut the supply of fuel by means of a throttle-opening switch at the time of deceleration of the engine; a first conductor for effecting fuel-cut operation and connecting the fuel-cut valve of the fuel-cut mechanism and the throttle-opening switch to each other; and a second conductor for effecting idling-up operation having an electromagnetic valve for operating the actuator, the second conductor being connected to the first conductor.
  • This arrangement makes it possible to use a detection signal from the throttle-opening switch for fuel-cut control as a signal for limiting the degree of idling-up so that degree of idling-up can be limited to a desired opening while ensuring the fuel cut operation and the prevention of catalyst overheating.
  • Figs. 1 to 3 show an embodiment of the present invention in which:
  • Figs. 1 to 3 illustrate an embodiment of the present invention. Referring first to Fig. 1, a carburetor 2, an inlet passage 4 and a carburetor throttle valve 6 are shown.
  • the carburetor throttle valve 6 is provided with a throttle lever 8 and a free lever 10.
  • An idling-up control screw 12 which contacts the free lever and functions to adjust the throttle opening is disposed on the throttle lever 8.
  • a controlling rod 16 of a diaphragm type actuator 14 is connected to the end of the free lever 10, and a negative-pressure passage 18 is connected to a pressure chamber (not shown) of the actuator 14.
  • a port 20 which is the starting end opening of the negative passage 18 communicates with the inlet passage 4 at the downstream side relative to the carburetor throttle valve 6.
  • the negative-pressure passage has two parts which are interconnected by an electromagnetic valve 22 which changes over and introduces a negative pressure and the atmospheric pressure.
  • a fuel-cut control mechanism will be described below.
  • a slow system fuel passage 26 through which a float chamber 24 of the carburetor 2 and the inlet passage 4 communicate with each other is provided.
  • a cut valve 28 for shutting off slow fuel is disposed at an intermediate portion of the fuel passage 26, and an idle mixing ratio controlling screw 30 is also disposed at another portion of the fuel passage 26.
  • a throttle-opening switch 32 which is normally closed is adapted to operate in association with the carburetor throttle valve 6. The switch 32 opens when the throttle opening is greater than a predetermined degree.
  • One end of the throttle-opening switch 32 is connected to a rotational speed sensor 34 which is supplied with ignition pulses, and the other end of the switch is connected to a first conductor 36 for fuel-cut control whereby the cut valve 28 is controlled so as to be opened or closed.
  • a rotary switch 38 which is opened or closed by the rotational speed sensor 34 in accordance with the rotational speed of the engine is disposed at an intermediate portion of the first conductor 36 so as to connect this conductor.
  • a second conductor 40 for idling-up control is connected to the first conductor 36 at a position between the rotary switch 38 and the throttle-opening switch 32.
  • the electromagnetic valve 22 is controlled through the second conductor 40 so as to operate the actuator 14 in accordance with the throttle opening.
  • a condition setting switch unit 42 which is turned on by an electrical load caused by the on-operation of a passenger-compartment cooler or an air conditioner is disposed at an intermediate portion of the second conductor 40. As shown in Fig. 3, this condition setting switch unit 42 is constituted by a switch SW1 which is turned on when a first electrical load is produced by the operation of the cooler or air conditioner, and a second SW2 which is turned on when a second electrical load is caused by other factors.
  • the system shown in Fig. 1 also includes a filter 44 through which atmospheric-pressure air is introduced by the electromagnetic valve 22, and a battery 46.
  • the throttle-opening switch 32 When the opening of the carburetor throttle valve 6 is reduced below a predetermined degree at which the fuel-cut idling switch is operated, the throttle-opening switch 32 is turned on. If the rotational speed of the engine is higher than a predetermined level, that is, the speed at which the fuel-cut operation is performed, the rotary switch 38 is turned on by the rotary sensor 34 which is supplied with ignition pulses and which detects the rotational speed of the engine, thereby connecting the first conductor. At this time, a fuel cut region is defined, as represented by the hatched area in Fig. 2.
  • the cut valve 28 operates so as to close the fuel passage of the slow system and shut off the supply of slow fuel from the float chamber 24 of the carburetor 2 to the inlet passage 4, thereby preventing discharge of unburnt gas at the time of deceleration and, hence, improving the fuel consumption.
  • condition setting switch 42 is turned on in response to the application of the first electrical load effected when the cooler or air conditioner is used so that the switch SW1 is turned on. Since, at this time, the opening of the carburetor throttle valve 6 is, of course, below the predetermined degree, the throttle-opening switch 32 maintains the on state. In response to the on state of the throttle-opening switch 32, the second conductor 40 is connected so as to effect idling-up control.
  • the electromagnetic valve 22 is changed over under control so that a negative pressure in the inlet passage 4 at the downstream side relative to the carburetor throttle valve 6 acts on the pressure chamber of the diaphragm type actuator 14 via the negative-pressure passage 18; the free lever 10 is turned as the control rod 16 is pulled; and the opening of the carburetor throttle valve 6 is increased, thus effecting idling-up.
  • the throttle-opening switch 32 is turned off so that the first and second conductors 36 and 40 are shut off, thereby inhibiting the idling-up control. That is, the idling-up-possible region is set by the throttle-opening switch, as indicated in Fig. 2.
  • the degree of idling-up can be limited to the predetermined throttle opening, that is, within the idling-up-possible region by the operation of the throttle-opening switch while ensuring the fuel cut control. It is thereby possible to prevent catalysts from overheating.
  • the present invention is not limited to the above-described embodiment and can be modified and applied variously.
  • the operation of the passenger-compartment cooler or air conditioner has exemplified the electrical load which turns on the condition setting switch, but it is also possible to design the controller such that the condition setting switch is turned on to connect the second conductor when electrical loads such as the on operations of a power transmission clutch for the cooler or air conditioner, a heater blower, headlamps, and a heater power source for a rear defogger are produced.
  • the idling-up controller in accordance with the present invention has the idling-up control mechanism and the fuel-cut control mechanism and, in this controller, the first conductor for fuel-cut control which connects the fuel-cut valve of the fuel-cut mechanism and the throttle-opening switch is connected to the second conductor for idling-up control which has the electromagnetic valve for operating the actuator. It is thereby possible to use a detection signal from the throttle-opening switch for fuel-cut control as a signal for limiting the degree of idling-up so as to enable suitable idling-up in response to the throttle opening.
  • the degree of idling-up can be limited to the predetermined throttle opening, that is, within the idling-up-possible region by the operation of the throttle-opening switch while ensuring the fuel-cut control and preventing catalysts from overheating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)

Claims (2)

  1. Leerlaufdrehzahlregelvorrichtung umfassend:
    einen Treibstoffabsperrmechanismus mit einem Treibstoffabsperrventil (28) angeordnet an einem Zwischenabschnitt einer Leitung (26) des Vergasers für den Langsamlauf, wobei der Treibstoffabsperrmechanismus geeignet ist, die Treibstoffversorgung mittels eines Drosselöffnungsschalters (32) zu dem Zeitpunkt der Verzögerung der Maschine abzusperren, wobei der Drosselöffnungsschalter (32) durch die Öffnungsstellung des Drosselventils (6) in der Ansaugleitung (4) betätigt wird;
    einen ersten Leiter (36) zum Bewirken eines Treibstoffabsperrbetriebs, wobei der erste Leiter (36) das Treibstoffabsperrventil (28) des Treibstoffabsperrmechanismus und den Drosselöffnungsschalter (32) miteinander verbindet,
    gekennzeichnet durch
    einen Leerlaufdrehzahlregelmechanismus zum Bewegen des Drosselventils (6) in der Ansaugleitung (4) des Vergasers zu einer vorbestimmten Leerlaufstellung mittels eines Stellglieds (14);
    einen zweiten Leiter (40) zum Bewirken eines Leerlaufbetriebs, der ein elektromagnetisches Ventil (22), das das Stellglied (14) betreibt, mit dem ersten Leiter (36) über einen zweiten Schalter (42) verbindet, wobei der Schalter (42) betätigt wird, wenn zusätzliche Lasten mit der Maschine verbunden sind, so daß eine Öffnungsbewegung des Drosselventils (6) eine Öffnung des Drosselöffnungsschalters (32) verursacht, wobei sie den Kontakt der Stromquelle zu dem ersten und zweiten Leiter (36,40) unterbricht, was das Stellglied (14) verursacht, den Öffnungsgrad des Drosselventils (6) zu vermindern.
  2. Leerlaufdrehzahlregelvorrichtung nach Anspruch 1,
    wobei der zweite Leiter (40) einen Zustandssetzschalter (42) hat, der an seinem Zwischenabschnitt angeordnet ist, wobei der Zustandssetzschalter durch eine elektrische Last angeschaltet wird.
EP19870112549 1986-08-29 1987-08-28 Leerlaufdrehzahlregelvorrichtung Expired EP0257654B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP131363/86U 1986-08-29
JP13136386U JPS6338648U (de) 1986-08-29 1986-08-29

Publications (3)

Publication Number Publication Date
EP0257654A2 EP0257654A2 (de) 1988-03-02
EP0257654A3 EP0257654A3 (en) 1989-05-24
EP0257654B1 true EP0257654B1 (de) 1991-10-23

Family

ID=15056175

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870112549 Expired EP0257654B1 (de) 1986-08-29 1987-08-28 Leerlaufdrehzahlregelvorrichtung

Country Status (4)

Country Link
EP (1) EP0257654B1 (de)
JP (1) JPS6338648U (de)
AU (1) AU604491B2 (de)
DE (1) DE3774040D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103551088B (zh) 2007-11-12 2016-12-07 霍斯特·格罗霍夫斯基 具有平行地操作的松散材料床层的流体处理设备

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690305A (en) * 1968-10-04 1972-09-12 Hitachi Ltd Fuel supply control system for automobile engines
JPS5415095B2 (de) * 1974-03-19 1979-06-12
FR2293598A1 (fr) * 1974-12-06 1976-07-02 Dba Systeme economiseur de carburant
US4060063A (en) * 1975-06-02 1977-11-29 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
JPS57119149A (en) * 1981-01-13 1982-07-24 Suzuki Motor Co Ltd Device for stopping fuel supply to internal combustion engine at its deceleration
JPS58155257A (ja) * 1982-03-09 1983-09-14 Toyota Motor Corp ガソリンエンジンの燃料カツト装置
JPS618452A (ja) * 1984-06-22 1986-01-16 Toyota Motor Corp 内燃機関の減速制御装置

Also Published As

Publication number Publication date
EP0257654A2 (de) 1988-03-02
JPS6338648U (de) 1988-03-12
EP0257654A3 (en) 1989-05-24
DE3774040D1 (de) 1991-11-28
AU604491B2 (en) 1988-03-03
AU7739387A (en) 1988-03-03

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