EP1188921A2 - Apparate für die Steuerung des Starters eines Verbrennungsmotors - Google Patents

Apparate für die Steuerung des Starters eines Verbrennungsmotors Download PDF

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Publication number
EP1188921A2
EP1188921A2 EP01121905A EP01121905A EP1188921A2 EP 1188921 A2 EP1188921 A2 EP 1188921A2 EP 01121905 A EP01121905 A EP 01121905A EP 01121905 A EP01121905 A EP 01121905A EP 1188921 A2 EP1188921 A2 EP 1188921A2
Authority
EP
European Patent Office
Prior art keywords
voltage
circuit
temperature
starter
inlet
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
EP01121905A
Other languages
English (en)
French (fr)
Other versions
EP1188921B1 (de
EP1188921A3 (de
Inventor
Gianni Regazzi
Alessandro Venturoli
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.)
Ducati Energia SpA
Original Assignee
Ducati Energia 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
Application filed by Ducati Energia SpA filed Critical Ducati Energia SpA
Publication of EP1188921A2 publication Critical patent/EP1188921A2/de
Publication of EP1188921A3 publication Critical patent/EP1188921A3/de
Application granted granted Critical
Publication of EP1188921B1 publication Critical patent/EP1188921B1/de
Anticipated expiration legal-status Critical
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
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/04—Starting of engines by means of electric motors the motors being associated with current generators
    • 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
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines

Definitions

  • the circuit for feeding the fuel mixture to the engine comprises a carburettor normally provided with an automatic starter device which comes into operation to enrich the fuel mixture fed to the engine, thereby facilitating the starting up and smooth running of the engine itself under certain environmental conditions.
  • an automatic starter device comprises a wax-type thermostatic actuator disposed into an auxiliary circuit for feeding the fuel mixture, which is provided with a resistor element which, when the engine is running, is constantly connected to the electric voltage generator which normally supplies power to the ignition system of the engine, in order to disconnect the auxiliary circuit feeding the fuel mixture to the engine.
  • the duration of the transient state depends upon the structural features of the starter device, as well as upon the thermal power generated by the resistor element, the environmental temperature and the thermal resistance existing between the starter device and the outside environment. In fact, these devices are very often set by appropriately insulating their housing.
  • a still further object of this invention is to provide an electronic control apparatus for controlling the starter device of an engine, as described previously, capable of self-powering by means of the same feeding voltage for the starter, without jeopardising the correct functioning of the latter.
  • a still further object of the invention is to provide a control apparatus for controlling a starter device, whereby it is possible to directly and flexibly enable the cutting in and cutting out of the auxiliary circuit supplying the fuel mixture to the engine, in such a way as to ensure the smooth running of the engine both at low environmental temperatures, and within a pre-established temperature range, thereby making it possible to reduce harmful emissions.
  • the electronic switch connected in series to the electric heating resistor of the starter device is switched on by a thermal sensor, upon reaching a pre-established threshold temperature, which senses the temperature in a housing for the sensor, regardless of the environmental temperature and the temperature of the engine.
  • the temperature sensing circuit 21 comprises a first voltage comparator 22, whose outlet U1 is connected, by means of the resistor R1, to the control electrode G of the electronic switch Q1.
  • the non inverting inlet I1 of the voltage comparator 22 is fed with a constant voltage, for example by the voltage of the central point of a voltage divider R2 and R3 which supplies a reference voltage correlated to the value of a threshold temperature Ts, which when exceeded causes the electronic switch Q1 to switch ON and consequently supply power to the resistor 19 of the starter.
  • the starter control device 20 is self-fed with the same inlet voltage for the heating resistor 19 of the thermostatic actuator of the starter device.
  • the inlet side of the temperature sensing circuit 21, that is to say the part which supplies power to the comparator 22 and the two voltage dividers R2, R3 and R4, R5 is connected, by means of a voltage stabiliser 23, to the outlet of a direct current feeding circuit 24, comprising a diode D1 and a capacitor C1, branched from the inlet side IN of the control device 20, as shown.
  • the base of the transistor Q2 is in turn connected to the central point between a resistor R6 and a ZENER dicde Z1; the resistor R6, the diode Z1 and the transistor Q2 together define a voltage stabiliser circuit capable of stabilising the output voltage of the feeding circuit 24 at a constant value.
  • the non-inverting inlet I4 of the voltage comparator 26 is connected to the central point of a further voltage divider R9, R10 so as to be fed with a fraction of the output voltage of the feeding circuit 24; a hysteresis resistor R11 is connected between the non-inverting inlet I4 and the outlet of the voltage comparator 26.
  • the outlet of the voltage comparator 26 is connected to the cathode of a diode D2, whose anode is in turn connected to the control electrode G for the electronic switch Q1.
  • the apparatus operates as described briefly hereunder: at start up, when the engine is cold, or when the variable resistor R5 of the temperature sensing circuit 21 senses a Teng temperature below a pre-established threshold value Ts for controlling the starter (Teng>Ts-NO, fig. 6) Q1 is open or OFF and the resistor 19 of the starter is not powered (Starter OFF - fig. 6), and consequently the auxiliary circuit of the carburettor is open (SI), enabling a secondary flow of fuel mixture to be fed to the engine.
  • the voltage comparator 22 of the temperature sensing circuit 21 has its non-inverting inlet I1, and inverting inlet I2 connected to a resistive bridge fed with the voltage stabilised by circuit 23 comprising the voltage divider R2, R3 and the voltage divider R4 and R5, in which R5 is a thermoresistor with negative temperature coefficient (NTC) whose resistance varies as the temperature changes, that is to say it decreases as the temperature of the resistor increases.
  • NTC thermoresistor with negative temperature coefficient
  • the non-inverting inlet I1 of the comparator 22 consequently has a voltage of a constant value which defines the Ts value of the threshold temperature at which the temperature sensing circuit 21 comes into operation.
  • the inverting inlet I2 of the comparator 22 has a voltage which varies in relation to variations in the temperature of R5.
  • the temperature sensed by R5 is lower than the threshold temperature Ts; under these conditions the voltage applied to the inverting inlet I2 of the comparator 22 is higher than the voltage existing on the non inverting inlet I1.
  • the voltage at the outlet U1 of the comparator 22 will be low and the electronic switch Q1 will be cut off or open, preventing current from being fed to the resistor 19 of the starter.
  • the only current flowing in the starter is the current feeding the starter control device which being very low (0.5 mA, 3mA), is unable to activate the starter which requires approximately 1.5 A to be activated, and 0.2 A to remain in the activated state.
  • the starter closes the auxiliary circuit for feeding fuel to the engine after a transitory period or interval of time depending upon the operative conditions of the engine, as well as upon the temperature of the external environment.
  • the MOS transistor Q1 of fig. 2 or other equivalent power switch therefore constitutes a thermally-controlled electronic switch, which, when it is conductive condition, presents a very low voltage drop. Under these conditions the capacitor C1 of the feeding circuit 24 discharges progressively to feed the entire device.
  • control circuit 25 comprising the voltage comparator 26 is provided with hysteresis on the voltage existing at the terminals of the capacitor C1.
  • the control circuit 25 comprising the voltage comparator 26 is provided with hysteresis on the voltage existing at the terminals of the capacitor C1.
  • the switch Q1 will be cut off, or in a conductive state, depending on the condition of the outlet U1 of the comparator 22, which in turn will depend on the temperature of the variable resistor R5; if the temperature sensed by the resistor R5 is below the threshold value Ts (low temperature), then the outlet of the comparator 22 will be low and Q1 cut off, enabling the capacitor C1 to recharge, by means of the diode D1, to the voltage value existing on the inlet terminal IN.
  • the starter since the device consumes a very small amount of current, varying roughly from 0,5 mA to 3 mA in relation to the peak voltages present on the inlet terminals IN, of the resistors, and to the type of voltage comparator used, with a temperature below the threshold value Ts and consequently with Q1 open, the starter in fact is not powered since in order to be activated it would require a considerably higher current, for example of 1,5 Ampere, and a current for maintaining the conductive state of approximately 0,2 Ampere.
  • the time required by C1 to recharge from the low value of the voltage threshold, to the high value is very short, while the time in which the same capacitor C1 discharges from the high threshold to the low threshold, to feed the temperature sensing circuit 21, depends upon the current consumption of all the components.
  • a third voltage comparator 27 whose non-inverting inlet I5 is connected to the central point of the resistors R4 R5, while its inverting inlet I6 is connected to the central point of a further voltage divider R12, R13 fed with the stabilised output voltage of the circuit 23; R12, R13 define the second temperature threshold Ts2 as required.
  • the outlet of the voltage comparator 27 on the contrary is connected to the cathode of a diode D3, while the anode of D3 is connected to the control electrode G for controlling the electronic switch Q1, as shown.
  • the starter control apparatus comprises a single thermally-operated electronic switch, in that the voltage regulator 15 used supplies only positive half waves as its AC outlet.
  • reference 24 has been used to indicate a self-feeding circuit, reference 23 a voltage stabiliser, and reference 25 a feeding control circuit, as explained previously.
  • phantom lines have been used to indicate the use of a voltage comparator 27 whenever two threshold temperatures Ts1 and Ts2 are required.
  • the circuit of figure 4 differs from the circuit of figure 2, due to the presence of two thermally-controlled electronic switches Q1 and Q3, and due to the fact that the feeding circuit 24 is connected to the inlet terminal IN and to the earth GND, by means of two diodes D1, D4 with the cathode in common, designed to allow the charging of the capacitor C1 both during the positive half waves, and during the negative half waves of the voltage existing at the AC outlet of the voltage regulator 15.
  • the circuit of figure 4 operates in a substantially similar way to the circuit of figure 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Electrical Control Of Ignition Timing (AREA)
EP01121905A 2000-09-18 2001-09-12 Apparate für die Steuerung des Starters eines Verbrennungsmotors Expired - Lifetime EP1188921B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000MI002036A IT1318874B1 (it) 2000-09-18 2000-09-18 Apparecchiatura per il controllo dello starter in motori a combustione interna
ITMI002036 2000-09-18

Publications (3)

Publication Number Publication Date
EP1188921A2 true EP1188921A2 (de) 2002-03-20
EP1188921A3 EP1188921A3 (de) 2004-08-25
EP1188921B1 EP1188921B1 (de) 2006-03-22

Family

ID=11445822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01121905A Expired - Lifetime EP1188921B1 (de) 2000-09-18 2001-09-12 Apparate für die Steuerung des Starters eines Verbrennungsmotors

Country Status (5)

Country Link
EP (1) EP1188921B1 (de)
AT (1) ATE321202T1 (de)
DE (1) DE60118072T2 (de)
ES (1) ES2256134T3 (de)
IT (1) IT1318874B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1544350A (en) * 1923-10-29 1925-06-30 Glen R Sisson Mixture control for internal-combustion engines
US4344898A (en) * 1981-12-10 1982-08-17 Aisan Kogyo Kabushiki Kaisha Carburetor controlling system
FR2636096A1 (fr) * 1988-09-06 1990-03-09 Weber Srl Dispositif de chauffage, destine notamment a un element d'un carburateur de moteur a combustion interne
EP0693620A2 (de) * 1994-07-22 1996-01-24 NIPPON THERMOSTAT Co., Ltd. Automatische Startvorrichtung für Brennkraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1544350A (en) * 1923-10-29 1925-06-30 Glen R Sisson Mixture control for internal-combustion engines
US4344898A (en) * 1981-12-10 1982-08-17 Aisan Kogyo Kabushiki Kaisha Carburetor controlling system
FR2636096A1 (fr) * 1988-09-06 1990-03-09 Weber Srl Dispositif de chauffage, destine notamment a un element d'un carburateur de moteur a combustion interne
EP0693620A2 (de) * 1994-07-22 1996-01-24 NIPPON THERMOSTAT Co., Ltd. Automatische Startvorrichtung für Brennkraftmaschine

Also Published As

Publication number Publication date
DE60118072T2 (de) 2006-08-24
EP1188921B1 (de) 2006-03-22
ES2256134T3 (es) 2006-07-16
ITMI20002036A1 (it) 2002-03-18
IT1318874B1 (it) 2003-09-10
DE60118072D1 (de) 2006-05-11
EP1188921A3 (de) 2004-08-25
ATE321202T1 (de) 2006-04-15
ITMI20002036A0 (it) 2000-09-18

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