EP0036396A2 - Dispositif pour commander l'alimentation en carburant d'un moteur à combustion interne à cycle Beau de Rochas, de véhicule - Google Patents

Dispositif pour commander l'alimentation en carburant d'un moteur à combustion interne à cycle Beau de Rochas, de véhicule Download PDF

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Publication number
EP0036396A2
EP0036396A2 EP81830039A EP81830039A EP0036396A2 EP 0036396 A2 EP0036396 A2 EP 0036396A2 EP 81830039 A EP81830039 A EP 81830039A EP 81830039 A EP81830039 A EP 81830039A EP 0036396 A2 EP0036396 A2 EP 0036396A2
Authority
EP
European Patent Office
Prior art keywords
circuit
signal
output
speed sensor
sensor means
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.)
Granted
Application number
EP81830039A
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German (de)
English (en)
Other versions
EP0036396B1 (fr
EP0036396A3 (en
Inventor
Vittorio Di Nunzio
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.)
Fiat Auto SpA
Original Assignee
Fiat Auto SpA
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
Priority claimed from IT67400/80A external-priority patent/IT1129434B/it
Priority claimed from IT67770/80A external-priority patent/IT1128448B/it
Application filed by Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0036396A2 publication Critical patent/EP0036396A2/fr
Publication of EP0036396A3 publication Critical patent/EP0036396A3/en
Application granted granted Critical
Publication of EP0036396B1 publication Critical patent/EP0036396B1/fr
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
    • 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

Definitions

  • the present invention relates to a device for controlling the fuel feed for Otto-cycle internal combustion engines for motor vehicles.
  • a control device of the type including:
  • the fuel feed is restored again when the speed of rotation of the engine falls below the predetermined minimum value or when the accelerator pedal is again pressed.
  • the fuel-feed control devices further allow a saving in fuel, for example on all occasions when the engine is driven by the vehicle wheels through the transmission system. These conditions occur rather frequently, particularly during urban driving, for example when the vehicle slows to stop at traffic lights. Under these conditions, the accelerator pedal has barely been released before the fuel feed pipe is closed. The engine does not stall since it is driven by the transmission system. Immediately the speed of rotation of the engine falls below a predetermined minimum value the fuel feed is restored.
  • a disadvantage of known devices is related to the fact that there is a period of delay, which cannot be ignored, between the instant at which the fuel feed to the engine is re-established and the instant at which the engine again supplies driving torque. This period of delay may result in stalling of the engine, particularly when the engine is uncoupled from the transmission (friction clutch disengaged) and hence is no longer driven.
  • a threshold speed value which was rather high (about 2000 rpm).
  • the use of a high speed threshold value allows stalling of the engine to be averted.
  • a high speed threshold value involves' a drastic reduction in the benefits resulting from the use of the fuel feed control device, so that the use of such a control device has a rather limited economic advantage.
  • the object of the present invention is to provide a fuel feed control device for Otto-cycle internal combustion engines for vehicles, which is both simple and economical to manufacture, easy to instal, and which is free from the present disadvantages of the devices of the prior art.
  • the present invention provides a fuel speed control device of the type specified above, the main characteristic of which lies in the fact that it further includes a processing circuit connected to the speed sensor means and arranged to generate an electrical signal having an amplitude which increases with time according to a predetermined law when the signal provided at the output of the speed sensor means falls at a rate greater than a predetermined rate; the output of the said processing circuit being connected to the second input of the said comparison circuit.
  • an analogue circuit arranged to provide at its output an electrical signal the amplitude of which is substantially proportional to the speed of rotation of the engine of the vehicle (not shown).
  • the analogue circuit 1 has an input terminal la intended to be connected to the induction coil (not shown) of the ignition circuit of the vehicle.
  • the terminal la constitutes the input of a pulse shaping circuit 2 the output of which is connected to a monostable circuit 3. This latter is connected to the input of a filter 4 the output of which is connected to the input of an amplifier 5.
  • the output of this amplifier constitutes the output of the analogue circuit 1 and is indicated by lb.
  • the output Ib of the analogue circuit 1 is connected to the input of a processing circuit 6 and to a first input 7a of a threshold comparison circuit 7 exhibiting hysteresis.
  • the second input 7b of this circuit is connected, through a resistor 8, to a d.c. reference voltage source 9 constituted, for example, by a potentiometer 10 the resistive element of which is connected between a d.c. voltage supply and earth.
  • the output of the processing circuit 6 is connected to the input 7b of the comparison circuit 7 by means of a resistor 11.
  • the output of the comparison circuit 7 is connected to a first input 12a of a logic AND gate 12, the output of which is connected to a shut off device 13 by means of a transistorised power output stage 14.
  • the shut off device 13 may, for example, be constituted by an electrovalve disposed in the fuel feed pipe of the engine.
  • a position detector device 15 arranged to provide an enabling electrical signal when the accelerator pedal (not shown) of the engine is released, is connected to the second input 12b of the logic AND gate 12 through an inverter 16.
  • the position detector device 15 may be constituted by a switch associated with the accelerator pedal.
  • the position detector device 15 may be constituted by a switch associated with a butterfly valve (not shown) of the carburettor, and, in general, by any device capable of providing a signal of the on/off type when the accelerator pedal is pressed/released.
  • the detector device 15 provides at its output a signal "1" when the accelerator pedal is pressed, and a signal “0" when the accelerator is released.
  • the threshold comparison circuit 7 includes an operational amplifier 17, an input resistor 18 and a feedback resistor 19.
  • the processing circuit 6 includes a memory circuit 20 constituted by a diode 21 having its anode connected to the output of the amplifier 5, and a capacitor 22 and a resistor 23 connected in parallel with each other between the cathode of the diode 21 and earth.
  • the memory circuit 20 is connected to a first input 24a of a differential amplifier 24 a second input 24b of which is connected to the output of the amplifier 5.
  • the output of the differential amplifier 24 is connected to the input 7b of the threshold comparison circuit 7, through the resistor 11.
  • a curve A shows a possible variation of the signal provided at the output of the amplifier 5 as a function of time t.
  • the amplitude of this signal is proportional to the speed of rotation of the engine.
  • two parallel lines L , L have been drawn which represent the levels of the upper and lower operating thresholds of the threshold comparator 7. These levels may correspond, for example, to 1700 rpm and 1300 rpm respectively.
  • the signal A which is proportional to the speed of the engine, starts to fall.
  • the rate at which the signal falls depends on numerous factors. For example, after release of the accelerator pedal, the rate at which the signal A falls will be greater or smaller according to whether or not the brakes are applied.
  • the diode 21 isolates this R-C circuit from the output of the amplifier 5.
  • the capacitor 22 discharges through the resistor 23 and the voltage thereacross, the variation of which is indicated by S in Figure 2, is fed to the input 24a of the differential amplifier 24.
  • This differential amplifier 24 provides at its output an increasing signal the instantaneous amplitude of which corresponds to the difference between the instantaneous amplitudes of the curve S and the branch A of the curve A.
  • This signal is superimposed on the constant reference fed to the input 7b of the threshold comparison circuit 7. Hence, from the instant t the level of the lower operating threshold of the comparator 7 ceases to be constant, and starts to increase in accordance with the curve indicated by T in Figure 2.
  • the output of the logic AND gate 12 will have changed to level "1" bringing about, through the power stage 14, the actuation of the shut off device 13 disposed in the fuel feed pipe of the engine.
  • the processing circuit 6 causes a progressive increase in the level of the lower operating threshold of the threshold comparison circuit 7. This increase in the lower operating threshold is greater the more rapid the fall in speed of the engine. Without the use of the processing circuit 6, the restoration of the fuel feed would occur at the instant indicated by t 3 in Figure 2. The effect of the use of the processing circuit 6 is thus to advance the restoration of the fuel feed to an extent which is greater the faster the fall in speed of the engine. This ensures that the fuel feed is restored in time, before the engine can stall.
  • the control device operates in a rather different manner from that indicated above when, subsequent to the instant t , the speed of rotation of the engine falls with a time constant greater than the discharge time constant of the R-C circuit 22,23. Supposing, in fact, that from the instant t 1 , the curve A of Figure 2 decreases along the branch A 2 located above the curve S which corresponds to the discharge of the said R-C circuit, in this situation the diode 21 remains conductive, and the memory circuit 20 continues to reproduce at its output the signal provided to it by the amplifier 5, that is, the signal A. As a result, the differential amplifier 24 provides a zero signal at the input 7b of the comparison circuit 7.
  • the processing circuit 6 is thus arranged to maintain the level of the lower operating threshold of the threshold comparison circuit 7 unaltered when the speed of rotation of the engine increases, is constant, or decreases with a time constant greater than the time constant of the-R-C circuit 22, 23.
  • the processing circuit 6 superimposes on the level of the lower operating threshold L 1 , a signal of an amplitude which increases in time to a proportionally larger extent the greater the decrease in the speed of rotation of the engine.
  • the processing circuit 6 thus enables the setting of a lower operating threshold of the comparison circuit 7 which has a value less than the threshold values which c.ould be set for the control devices of the prior art.
  • the control device When, with the accelerator pedal released, the speed of rotation of the engine falls slowly, the control device according to the invention provides for the restoration of the feed only when the speed of the engine has reached a threshold value less than that of the devices of the prior art. Consequently the device according to the invention allows the emission of unburnt hydrocarbons and the heating of the catalytic silencer to be greatly reduced. A greater fuel saving is also possible.
  • FIG 3 shows a second embodiment of the device according to the invention.
  • the same elements already described with reference to Figure 1 have been given the same reference numerals.
  • the processing circuit 6 further includes a generator circuit 25 having its input connected to the output of the logic inverter 16, and its output connected to the input 7b of the threshold comparison circuit 7 through a resistor 26.
  • the generator circuit 25 is arranged to generate a signal of increasing amplitude when its input is fed with a signal at level "I".
  • This circuit may be constituted, for example, by a ramp voltage generator circuit.
  • the detector device 15 activates the generator circuit 25 through the logic inverter 16.
  • the generator circuit provides a signal of increasing amplitude to the input 7b of the threshold comparison circuit 7. Consequently, as is seen from Figure 4, from the instant t at which the accelerator pedal is released, the level of the lower operating threshold of the comparison circuit 7 ceases to be constant and starts to increase. If the speed of rotation of the engine decreases with a time constant less than that of the R-C circuit 22, 23, the level of the lower operating threshold of the comparator 7 increases according to the curve T' of Figure 4. If, however, the speed of the engine falls with a time constant greater than that of the said R-C circuit, the lower operating threshold of the comparator 7 increases according to the curve T" of Figure 4 .
  • the effect of the generator circuit 25 is to bring about a progressive increase in the level of the lower operating threshold of the threshold comparator 7 when the accelerator pedal is released.
  • the control device illustrated in Figure 3 provides for the gradual raising of the level of the lower operating threshold of the comparison circuit 7 so as to ensure that the fuel feed is restored earlier and earliest as the induction manifold dries.
  • the fuel feed is restored at the instant t , rather than at the instant t .
  • FIG. 5 illustrates a further embodiment of the device according to the invention.
  • the elements common to the embodiments previously described have been indicated by the same reference numerals.
  • the processing circuit 6 further includes a control circuit 27 having a first input 27a connected to the output of the amplifier 5, and a second input 27b connected to the output of'a device 28 for detecting the position of the friction-clutch control pedal.
  • the detector device 28 may, for example, be constituted by a switch associated with the friction-clutch control pedal, and arranged to provide at its output a signal at level "0" when this pedal is released (friction clutch engaged) and a signal at level "1" when this pedal is depressed (friction clutch disengaged).
  • the output of the control circuit 27 is connected to a third input 12e of the logic AND gate 12.
  • the control circuit 27 includes a threshold comparison circuit 29 having a first input 29a connected to the output of the amplifier 5, and a second input 29b connected to a d.c. reference voltage supply constituted, for example, by a potentiometer 30 connected between a voltage supply source and earth.
  • the output of the threshold comparison circuit 29 is connected to a first input 31a of a logic OR gate 31 which has a second input 31b connected to the detector device 28 via a logic inverter 32.
  • FIG. 5 The operation of the Figure 5 embodiment of the device according to the invention is essentially similar to that of the embodiments described above.
  • Figure 6 are illustrated the wave forms A to G of signals provided at the respective outputs of the analogue circuit 1, the threshold comparison circuit 7, the logic inverter 16, the logic AND gate 12, the logic inverter 32, the threshold comparator 29, and the logic OR gate 31.
  • the device illustrated in Figure 5 allows the restoration of the fuel feed to be advanced whenever, in the period in which the fuel feed is interrupted, the friction clutch is disengaged and the speed of rotation of the engine falls below the operating threshold of the comparator 29.
  • the device illustrated may be used to advantage for controlling the fuel feed to carburettor, Otto-cycle, internal combustion engines. It may also, however, be used with injection engines.
  • the position detector device 15 may be constituted by an electrical air-flow meter disposed in the induction manifold.
  • a threshold comparison circuit connected to the output of the flow meter may, in this case, provide a signal of the on/off type when the accelerator pedal is pressed/released.
  • shut off device may be constituted by the injectors of the engine themselves.

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  • 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)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP81830039A 1980-03-17 1981-03-12 Dispositif pour commander l'alimentation en carburant d'un moteur à combustion interne à cycle Beau de Rochas, de véhicule Expired EP0036396B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT67400/80A IT1129434B (it) 1980-03-17 1980-03-17 Dispositivo intercettatore di benzina a soglia tachimetrica variabile per motori a ciclo otto particolarmente del tipo a carburatore
IT6740080 1980-03-17
IT67770/80A IT1128448B (it) 1980-05-16 1980-05-16 Dispositivo economizzatore ad inter cettazione di benzina per motori a ciclo otto
IT6777080 1980-05-16

Publications (3)

Publication Number Publication Date
EP0036396A2 true EP0036396A2 (fr) 1981-09-23
EP0036396A3 EP0036396A3 (en) 1982-05-05
EP0036396B1 EP0036396B1 (fr) 1984-11-14

Family

ID=26329766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81830039A Expired EP0036396B1 (fr) 1980-03-17 1981-03-12 Dispositif pour commander l'alimentation en carburant d'un moteur à combustion interne à cycle Beau de Rochas, de véhicule

Country Status (3)

Country Link
EP (1) EP0036396B1 (fr)
DE (1) DE3167137D1 (fr)
ES (1) ES8204798A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2101674A5 (fr) * 1970-07-14 1972-03-31 Bosch
US3866584A (en) * 1970-11-03 1975-02-18 Volkswagenwerk Ag Switching device and circuit
FR2322265A1 (fr) * 1975-08-25 1977-03-25 Nippon Denso Co Installation d'injection de carburant pour moteurs a combustion interne
FR2376948A2 (fr) * 1977-01-05 1978-08-04 Mayer Ferdy Procede et dispositif pour ameliorer la consommation de carburant des vehicules
GB2062295A (en) * 1979-10-12 1981-05-20 Nissan Motor Automatic control of fuel supply in ic engines
GB2069180A (en) * 1980-01-31 1981-08-19 Nissan Motor Automatic control of fuel supply in ic engines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2101674A5 (fr) * 1970-07-14 1972-03-31 Bosch
US3866584A (en) * 1970-11-03 1975-02-18 Volkswagenwerk Ag Switching device and circuit
FR2322265A1 (fr) * 1975-08-25 1977-03-25 Nippon Denso Co Installation d'injection de carburant pour moteurs a combustion interne
FR2376948A2 (fr) * 1977-01-05 1978-08-04 Mayer Ferdy Procede et dispositif pour ameliorer la consommation de carburant des vehicules
GB2062295A (en) * 1979-10-12 1981-05-20 Nissan Motor Automatic control of fuel supply in ic engines
GB2069180A (en) * 1980-01-31 1981-08-19 Nissan Motor Automatic control of fuel supply in ic engines

Also Published As

Publication number Publication date
EP0036396B1 (fr) 1984-11-14
EP0036396A3 (en) 1982-05-05
ES500379A0 (es) 1982-05-16
DE3167137D1 (en) 1984-12-20
ES8204798A1 (es) 1982-05-16

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