EP0033939A2 - Dispositif de régulation d'alimentation en carburant par la buse de ralenti d'un moteur à combustion interne - Google Patents

Dispositif de régulation d'alimentation en carburant par la buse de ralenti d'un moteur à combustion interne Download PDF

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Publication number
EP0033939A2
EP0033939A2 EP81100752A EP81100752A EP0033939A2 EP 0033939 A2 EP0033939 A2 EP 0033939A2 EP 81100752 A EP81100752 A EP 81100752A EP 81100752 A EP81100752 A EP 81100752A EP 0033939 A2 EP0033939 A2 EP 0033939A2
Authority
EP
European Patent Office
Prior art keywords
switch
speed
idling
idle
engine
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.)
Withdrawn
Application number
EP81100752A
Other languages
German (de)
English (en)
Other versions
EP0033939A3 (fr
Inventor
Dieter Ing. Fialla
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.)
Fialla Dieter
Knigge Erich
Original Assignee
Fialla Dieter
Knigge Erich
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 Fialla Dieter, Knigge Erich filed Critical Fialla Dieter
Publication of EP0033939A2 publication Critical patent/EP0033939A2/fr
Publication of EP0033939A3 publication Critical patent/EP0033939A3/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • 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 a device for regulating the fuel supply to internal combustion engines via an electromagnetically controlled idle nozzle, in which the fuel supply can be switched off via the idle nozzle when the engine is in push mode by means of a switch actuated directly or indirectly by the accelerator pedal, with an electronic device paralleling this switch Controlled further speed-dependent switch is located, which is closed when the engine speed drops into a range corresponding to the idling speed, so that the idling nozzle is switched on again and opens.
  • Devices of this type have the purpose of saving gasoline which is still supplied but not required when the engine is in the pushing mode via the idling nozzle.
  • the idle nozzle is therefore in front of these directions designed as an idle mixture shutoff valve.
  • the engine speeds are determined and evaluated via the voltage output by the alternator of the vehicle.
  • a disadvantage of this arrangement is that on the one hand the accuracy of the evaluation depends on the shape of the characteristic due to the different course of the characteristics of the individual alternators, and that on the other hand the drive of the alternator in a vehicle is subject to fluctuations, for example due to the non-positive power transmission by means of the V-belt . This leads to inaccurate and different switching times.
  • the invention is accordingly based on the object of designing an arrangement of the type mentioned at the outset in such a way that the point in time at which the motor is switched on again is observed with the greatest possible accuracy in the idling speed range.
  • This object is achieved in that the restart is carried out by a pulse control, the pulses being picked up by the ignition device of the engine.
  • the pulses via a pulse shaper, an amplifier stage and a phase rotation and stabilization device are fed to a digital-to-analog converter (for "pulse smoothing") and if the analog values thus formed are fed to a threshold switch (window discriminator) which acts on a relay coil of the parallel switch via an amplifier.
  • the threshold value switch is advantageously adjustable in terms of the size of the threshold value, for example via a variable resistor, so that the idling speed, which differs from engine to engine, can be precisely specified at the threshold value switch.
  • the threshold switch By means of the threshold switch, the lower threshold value corresponding to the reclosing time is set precisely and, in addition, a range is set in which the speed can remain when the engine is started. This range corresponds to approximately 300 to 900 rpm. This hysteresis range is necessary to prevent the valve from fluttering, i.e. constant opening and closing.
  • the changing signal of the threshold switch is fed to the coil of the idle mixture cut-off valve via an amplifier and a switching relay.
  • the signal of the threshold switch corresponding to the point in time at which it is switched on is fed to an electronic switch which closes as a result and is connected upstream of a capacitor charging stage which is acted upon by a push-pull voltage converter.
  • this switch When the signal corresponding to the lower idling speed and thus the reclosing time reaches the electronic switch, this switch is closed, so that the capacitor previously charged via the push-pull voltage converter can discharge via this electronic switch and supply its increased voltage to the idling mixture shut-off valve.
  • the capacitor is charged when the switching signal corresponding to the upper speed in the hysteresis range of the threshold switch is fed to a second electronic switch, which then closes and enables the capacitor to be charged by means of the push-pull voltage converter.
  • the arrangement described above is based on an idle mixture shut-off valve which is designed such that the idle nozzle closes when the current is switched off.
  • an idle mixture cut-off valve is provided which works in reverse by opening the idle nozzle when the current is switched off, in order to ensure that the idle power of the engine is retained in the event of damage to the winding or the like.
  • the arrangement must be designed in such a way that if the speed drops below the threshold value corresponding to the reclosure time, the parallel switch opens and is not closed.
  • the switch which can be actuated by the accelerator pedal is arranged directly on the carburetor and can be actuated by means of the throttle valve axis.
  • the throttle valve axis is expediently provided with a circle segment acting on a lever of the switch in order to keep the switch, which is designed as a pressure switch, actuated over a predetermined range of rotation of the throttle valve.
  • the invention provides in a modified embodiment that the signal of the threshold value switch corresponding to the reclosing time at the optimal idling speed is via a monostable /
  • the flip-flop is supplied to an electronic switch which closes as a result and which supplies an increased voltage to the coil of the idling mixture shut-off valve.
  • an electronic switch which closes as a result and which supplies an increased voltage to the coil of the idling mixture shut-off valve.
  • the voltage can be varied in terms of its size and can be adjusted to the force required to open the various idle mixture shut-off valves of different designs.
  • a carburetor 1 is provided with an electromagnetically controlled idle mixture shut-off valve 2, which is acted upon by an electronic device 3, which will be explained in detail later in connection with FIGS. 2 and 3.
  • the electronic circuit 3 is supplied by the ignition device 4 of the motor vehicle directly proportional pulses of the engine speed.
  • a microswitch 5 Arranged on the carburetor 1 is a microswitch 5, the actuating lever 6 of which is acted upon by a circular segment 7, which is arranged on the throttle valve axis 8 in order to keep the microswitch 5, which is designed as a pressure switch, actuated over a predetermined range of rotation of the throttle valve of the carburetor 1.
  • the microswitch 5 can thus be actuated by the accelerator pedal, the idle mixture shut-off valve being switched off when the vehicle engine is in the push mode by means of this switch.
  • Fig. 2 shows the device 3 in the block diagram.
  • the pulses supplied by the breaker contacts 11 of the ignition device 4 are fed to a pulse shaper 12, in which they are shaped into rectangular pulses and then passed through an amplifier stage 13 and a phase rotation and stabilization device 14 into a digital-to-analog converter 15, in which they are used "Pulse smoothing" can be converted into analog values.
  • a threshold switch 16 (a window discriminator).
  • the threshold switch 16 acts on a relay 22 with a switch 22a which is parallel to the microswitch 5 which can be actuated by the throttle valve axis.
  • the coil 23 of the idle mixture shut-off valve is acted on, so that the idle nozzle opens.
  • switch 5 When accelerating, switch 5 is immediately opened again, while switch 22a also remains open until the engine idle speed is reached. In this area, which can be extended over a long period of time when the engine is in overrun mode, both switches 5 and 22a are open, so that the coil 23 of the idling mixture shut-off valve 2 is without current and the valve is closed. The fuel supply via the idle nozzle is therefore interrupted in this area.
  • the application of the relay 22 is switched off at a precisely set point in time corresponding to the optimal idling speed, so that the switch 22a now closes again and the idling nozzle is consequently opened.
  • the threshold switch 16 is provided with a hysteresis area, which has the effect that the relay 22 is not yet acted upon again when the speed increases, but only when this occurs Speed increase the hysteresis area is left.
  • FIG. 2 also shows a device with which it is possible to briefly apply an increased voltage to the coil 23 of the idling mixture shut-off valve in order to overcome the retaining force due to the negative pressure in the carburetor intake pipe.
  • This device consists of an electronic switch 17 which is connected upstream of a capacitor charging stage 21 which is acted upon by a push-pull voltage converter 19 and an electronic switch 20 connected downstream of the latter. The electronic switch 17 in turn acts on the coil 23 of the idle mixture shut-off valve 2.
  • the capacitor of the capacitor charging stage 21 is charged when the switching signal corresponding to the upper speed of the hysteresis range of the threshold switch 16 is supplied to the second electronic switch 20, which then closes, so that the capacitor is now charged by means of the push-pull voltage converter can.
  • FIG. 3 is the detailed circuit diagram of the arrangement according to FIG. 2.
  • the individual modules corresponding to the blocks in FIG. 2 are outlined in dashed lines and provided with the reference symbols according to FIG. 2 in order to facilitate the overview.
  • the variable resistor for setting the size of the threshold value of the threshold switch 16 is denoted by 25 in FIG. 3.
  • An integrated component IC1 essentially consists of a monostable multivibrator, which converts the input pulses taken directly from the interrupter 11 into rectangular pulses of constant duration.
  • the output signal acts on a load resistor R5 and on a voltage divider R6 / R7.
  • the current for a moving coil measuring device (tachometer) to be connected if necessary is set at resistor R5.
  • the signal at transistor T1 is amplified again and a phase shift is carried out.
  • transistor T2 whose operating voltage is stabilized to 12 V by Zener diodes, pulses with a positive amplitude occur via a load resistor R12. These pulses are fed via a diode D4 to an integrating stage consisting of the resistor R13 and the capacitor C4.
  • Resistor R14 is the discharge resistor for C4.
  • the corresponding voltage level is set at the integration stage.
  • This voltage level is fed to a further integrated module IC2.
  • This is a Schmitt trigger with an adjustable threshold and a fixed hysteresis.
  • the threshold value can be set externally using a trimmer R16. This sets the reclosing time of the idle mixture shut-off valve.
  • the operating voltage is increased from 12 V to a galvanically isolated voltage of 25 V via the push-pull voltage converter 19. This voltage is rectified via diodes D6 to D9.
  • the DC voltage is supplied to a capacitor C7 via a charging resistor R27, provided that the transistor T4 is driven with a low signal from the output of the integrated component IC2. At this time, the speed is above the threshold of the switching point set on the integrated module IC2.
  • the idle mixture shut-off valve is not activated by the electronics. If the engine speed approaches the idling speed, the switching threshold of the integrated module IC2 is undershot, so that its output 14 drives the transistor T5.
  • the capacitor charge of C7 25 V is used to overexcitation of the idle mixture shut-off valve.
  • the the necessary holding voltage of 12 V is provided by the relay contact of relay 22, which is simultaneously excited by transistor T3.
  • FIG. 4 is a block diagram similar to FIG. 2 in a modified embodiment.
  • the supply of an increased voltage by a capacitor is replaced by the supply of voltage by means of a voltage source 29, which can be a push-pull voltage converter, in particular the push-pull voltage converter from the embodiment according to FIGS. 2 and 3.
  • This voltage source is preceded by an electronic switch 28 which is controlled directly by the threshold switch 16 via a monostable multivibrator 27.
  • the signal of the threshold switch 16 corresponding to the reclosing time at the optimal idling speed is fed via the monostable multivibrator 27 to the electronic switch 28 that closes as a result, the voltage of the voltage source 29 is supplied to the coil 23 of the idling mixture shutoff valve 2.
  • FIG. 5 shows the detailed circuit diagram for this modified embodiment, the assemblies corresponding to the blocks in FIG. 4 again being outlined with dashed lines and provided with the reference symbols according to FIG. 4. 5, the flip-flop 27 is provided with an integrated component IC3 to which the voltage is supplied by the threshold switch 16 and which controls the electronic switch 28.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (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)
EP81100752A 1980-02-06 1981-02-03 Dispositif de régulation d'alimentation en carburant par la buse de ralenti d'un moteur à combustion interne Withdrawn EP0033939A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3004199 1980-02-06
DE19803004199 DE3004199C2 (de) 1980-02-06 1980-02-06 Vorrichtung zum Absperren der Brennstoffzufuhr im Schiebebetrieb eines Verbrennungsmotors

Publications (2)

Publication Number Publication Date
EP0033939A2 true EP0033939A2 (fr) 1981-08-19
EP0033939A3 EP0033939A3 (fr) 1981-09-16

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Family Applications (1)

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EP81100752A Withdrawn EP0033939A3 (fr) 1980-02-06 1981-02-03 Dispositif de régulation d'alimentation en carburant par la buse de ralenti d'un moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP0033939A3 (fr)
DE (1) DE3004199C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089929A1 (fr) * 1982-03-17 1983-09-28 WEBER S.r.l. Carburateur équipé d'un dispositif d'alimentation du moteur avec un mélange pauvre lors de la relâche de l'accélérateur
EP0094918A1 (fr) * 1982-04-13 1983-11-23 WEBER S.r.l. Carburateur équipé de dispositifs électromagnétiques de coupure de carburant lors de la relâche de l'accélérateur
GB2207466A (en) * 1987-07-10 1989-02-01 Huan Sung Cheng Solenoid valve control of a carburettor idling system
FR2619163A1 (fr) * 1987-08-03 1989-02-10 Campos Jean Louis Dispositif electronique de gestion de carburant pour moteurs essence et diesel
WO1990002873A1 (fr) * 1988-09-02 1990-03-22 Robert Bosch Gmbh Commande de moteur electronique a essai fonctionnel pour l'element final de l'allumage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1601366A1 (de) * 1968-02-22 1970-10-29 Willy Busch Sperrung der Benzinzufuhr waehrend der Schiebphase bei Vergasermotoren fuer Kraftfahrzeuge
FR2285519A1 (fr) * 1974-09-19 1976-04-16 Chioccini Roberto Dispositif de regulation de la distribution de carburant liquide ou gazeux pour moteurs a combustion interne, specialement destines a la traction automobile
FR2293598A1 (fr) * 1974-12-06 1976-07-02 Dba Systeme economiseur de carburant
FR2350467A1 (fr) * 1976-05-07 1977-12-02 Bosch Gmbh Robert Dispositif pour assurer la commutation d'organes de manoeuvre tels que soupapes electromagnetiques d'alimentation de ralenti

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH505287A (fr) * 1969-03-28 1971-03-31 Grosclaude Fernand Dispositif pour le réglage de l'alimentation en carburant d'un moteur à combustion interne
DE2455482A1 (de) * 1974-11-23 1976-05-26 Volkswagenwerk Ag Anordnung zur gewinnung von signalen fuer das steuergeraet einer elektronischen kraftstoffeinspritzung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1601366A1 (de) * 1968-02-22 1970-10-29 Willy Busch Sperrung der Benzinzufuhr waehrend der Schiebphase bei Vergasermotoren fuer Kraftfahrzeuge
FR2285519A1 (fr) * 1974-09-19 1976-04-16 Chioccini Roberto Dispositif de regulation de la distribution de carburant liquide ou gazeux pour moteurs a combustion interne, specialement destines a la traction automobile
FR2293598A1 (fr) * 1974-12-06 1976-07-02 Dba Systeme economiseur de carburant
FR2350467A1 (fr) * 1976-05-07 1977-12-02 Bosch Gmbh Robert Dispositif pour assurer la commutation d'organes de manoeuvre tels que soupapes electromagnetiques d'alimentation de ralenti

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089929A1 (fr) * 1982-03-17 1983-09-28 WEBER S.r.l. Carburateur équipé d'un dispositif d'alimentation du moteur avec un mélange pauvre lors de la relâche de l'accélérateur
EP0094918A1 (fr) * 1982-04-13 1983-11-23 WEBER S.r.l. Carburateur équipé de dispositifs électromagnétiques de coupure de carburant lors de la relâche de l'accélérateur
GB2207466A (en) * 1987-07-10 1989-02-01 Huan Sung Cheng Solenoid valve control of a carburettor idling system
FR2619163A1 (fr) * 1987-08-03 1989-02-10 Campos Jean Louis Dispositif electronique de gestion de carburant pour moteurs essence et diesel
WO1990002873A1 (fr) * 1988-09-02 1990-03-22 Robert Bosch Gmbh Commande de moteur electronique a essai fonctionnel pour l'element final de l'allumage
US5159912A (en) * 1988-09-02 1992-11-03 Robert Bosch Gmbh Apparatus for electronic engine control with performance check for the final ignition stage

Also Published As

Publication number Publication date
EP0033939A3 (fr) 1981-09-16
DE3004199A1 (de) 1981-08-13
DE3004199C2 (de) 1984-12-06

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Inventor name: FIALLA, DIETER, ING.