EP0756083B1 - Steuerschaltung für Glühkerzen eines Dieselmotors - Google Patents

Steuerschaltung für Glühkerzen eines Dieselmotors Download PDF

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Publication number
EP0756083B1
EP0756083B1 EP19960401483 EP96401483A EP0756083B1 EP 0756083 B1 EP0756083 B1 EP 0756083B1 EP 19960401483 EP19960401483 EP 19960401483 EP 96401483 A EP96401483 A EP 96401483A EP 0756083 B1 EP0756083 B1 EP 0756083B1
Authority
EP
European Patent Office
Prior art keywords
computer
circuit
terminal
mos
mos transistor
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
EP19960401483
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English (en)
French (fr)
Other versions
EP0756083A1 (de
Inventor
Gérard Lanchec
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.)
Sagem SA
Original Assignee
Sagem SA
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Publication date
Application filed by Sagem SA filed Critical Sagem SA
Publication of EP0756083A1 publication Critical patent/EP0756083A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • a diesel engine requires, before starting, that it be applied a certain preheating.
  • This preheating is carried out by specific candles which are controlled by a circuit powered by the vehicle battery.
  • the circuit of control has a timer function, to determine the duration application of the preheating current, and a function of power, to ensure the switching of the intense current passing through the candles, which have a low resistance value.
  • the control circuit uses the management computer (microprocessor) of the motor, which is connected, by a first removable power connector, to the spark plugs and, via a second removable connector for low currents, vehicle wiring harness.
  • management computer microprocessor
  • a relay static has a power MOS transistor, which has a drop of very low voltage and thus transfers all the battery voltage to a group of candles.
  • the power connector has three terminals, namely a power supply terminal, connected directly to the positive terminal of the battery, and two output terminals to supply two groups of spark plugs connected to the mass.
  • the microprocessor is supplied with battery voltage by the second connector, for low currents. Therefore, when the latter is disconnected, the microprocessor is normally de-energized. However, this is not case, because the MOS switch allows leakage currents, coming from the positive battery terminal.
  • the invention relates to a spark plug control circuit preheating of a diesel engine, comprising a computer and at least one electronic relay controlled by the computer, characterized in that it is provided means for connecting the computer to a reference voltage (mass) through the candles.
  • the control circuit delimited by an axis line in the figure, is carried by a printed circuit board and is housed, in a case not shown, at near a car's diesel engine. It includes a calculator 1 controlling an electronic relay 2 made up here of a MOS transistor of power.
  • a removable connector 3 connects the computer 1 as input to a blade 33 of a relay controlled by the car ignition key and a speed sensor engine 32.
  • the connector 3 connects the computer 1 to earth.
  • a removable connector 4, of power connects respectively, by terminals current input and output 41 and 42, drain 21 and source 23 of MOS 2 to the terminal supplying the voltage + Vb of the battery 30, and to an electrode a glow plug 31 for the diesel engine, a plug connected in addition to the mass of the battery 30.
  • the computer 1 is thus connected to the spark plug 31 at through MOS 2 and connector 4. For the sake of clarity, it is not shown as a candle and a single relay 2 associated.
  • the computer 1 comprises a microprocessor 11 controlling the grid 22 of the MOS 2 through a control circuit 12, in order to apply to the spark plug 31 a fixed-term heating in response to actuation of the ignition or starting the engine.
  • a link circuit 5 shown surrounded by a dotted frame, connects the grid 22 from MOS 2 to terminal 42 supplying the spark plug 31. More specifically, the drain 51 of a MOS transistor 50 is connected to the gate 22, normally controlled by the output of circuit 12, while source 53 of MOS 50 is connected to terminal output 42 through a series diode 54 setting a control threshold.
  • a divider bridge made up of two resistors 55-56 connects terminal 41, supplying MOS 2 with + Vb, to a ground link 61 of computer 1, internal to the card, polarized, as shown, by the earth terminal of the battery 30 through connector 3.
  • the midpoint of bridge 55-56 is connected to the gate 52 of the transistor 50 as well as at one end of a capacitor 57 of integration, connected, by its opposite end, to the source 53, through the diode 54, and to the output terminal 42.
  • the concept of the invention is to use the potential at the output 42 supplying the spark plug 31 as a low potential reference, in place of the ground (61) when not supplied to the card, in order to block the MOS 2.
  • connection circuit 5 to the computer 1 when the connector 3 is disconnected and therefore that the ground link 61 is floating.
  • the voltage + Vb of the power supply terminal 41 causes leakage currents to pass through the drain 21 to the grid 22 which, not being biased by the control circuit 12, charges and tends to unlock the MOS 2.
  • the link circuit 5 replaces the circuit 12 to flow to ground the parasitic charges accumulated on the grid 22, this flow taking place by the drain 51 and the source 53 of the MOS 50, the diode 54, the terminal 42 and the spark plug 31.
  • the latter of low resistance and traversed by a weak current, brings back thus, on terminal 42 a pseudo-mass.
  • the link of circuit 5 with terminal 42 of current output has a double function. On the one hand, as has just been explained, it serves to sell the parasitic charges. On the other hand, it can be considered as an entry of information, since it provides a voltage reference which is compared to the voltage of the internal ground link 61. As long as the latter is isolated of the mass of the battery 30, via the open connector 3, the divider bridge 55-56 has no mass reference so its midpoint has a high potential which leads to the conduction of the MOS 50. It applies a low resistance between the grid 22 and the source 23 which brings back to ground of the spark plug 31 the potential of the grid 22, by clearly blocking the MOS 2.
  • the capacitor 57 of the circuit integrator RC: 55-56 / 57 is too high to obtain a determined time constant used to filter the switching during Connections / disconnection of Connector 3 or during activation / deactivation of commands managed by the computer 1.
  • connection circuit 5 includes a voltage comparator with two inputs (61 and 42) and two outputs (51, 42) to block the MOS 2 by applying a blocking potential between two of these electrodes (22, 23).
  • circuit 5 could for example be used to reference the connection of ground (61) of circuit 12 to pseudo-ground (42), i.e. circuit 5 does not would not replace circuit 12 but that it would ensure correct operation of it, in the rest state, even in the absence of the real mass (61).
  • the action of circuit 5, blocking of MOS 2 would thus take place through circuit 12.
  • a separate control of circuit 5 on a specific electrode for blocking the electronic relay is also possible.
  • the pseudo-mass reference 42 ensures the operation of circuit 5, but that the blocking action of the latter on the electronic relay consists in ensuring maintaining a blocking potential on an electrode thereof, without this potential must necessarily be that of the pseudo-mass.
  • loopback between the two terminals of the battery, produced by the circuit 5, is independent of any notion of grounding one or the other terminal of this one.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Claims (6)

  1. Steuerschaltung für Glühkerzen (31) zum Vorglühen eines Dieselmotors, die einen Rechner (1) und mindestens ein durch den Rechner (1) gesteuertes elektronisches Relais (2) umfaßt, dadurch gekennzeichnet, daß Mittel (5) zum Anschluß des Rechners an eine Referenzspannung (Masse) über die Glühkerzen (31) vorgesehen sind.
  2. Steuerschaltung nach Anspruch 1, bei der der Rechner (1) mit den Glühkerzen (31) und mit Mitteln (33) zur Steuerung des Vorglühens jeweils durch zwei lösbare Anschlüsse (3, 4) verbunden ist.
  3. Steuerschaltung nach einem der Ansprüche 1 und 2, bei der das elektronische Relais ein MOS-Transistor (2) ist und die Mittel (5) zum Anschluß des Rechners (1) an die Referenzspannung so ausgelegt sind, daß sie zwischen Gate (22) und Source (23) des MOS-Transistors eine Sperrspannung anlegen.
  4. Steuerschaltung nach einem der Ansprüche 1 bis 3, bei der die Anschlußmittel (5) einen zweiten MOS-Transistor (50) aufweisen, dessen Gate (52) über eine Spannungsteilerbrücke (55-56) angesteuert wird, die über eine Spannungsklemme (21; 41) des Relais (2) versorgt wird, welche mit einer, die vorgenannte Referenzspannung bildenden, Spannungsquelle (30) verbindbar ist, und über eine innere Leitung (61), die mit der Referenzspannungsklemme der Spannungsquelle (30) verbindbar ist.
  5. Steuerschaltung nach Anspruch 4, bei der ein Verzögerungskondensator (57) das Gate (52) des zweiten MOS-Transistors (50) mit dessen Source (53) verbindet.
  6. Steuerschaltung nach einem der Ansprüche 4 und 5, bei der eine Diode (54) mit der Source (53) des zweiten MOS-Transistors (50) in Reihe geschaltet ist.
EP19960401483 1995-07-27 1996-07-05 Steuerschaltung für Glühkerzen eines Dieselmotors Expired - Lifetime EP0756083B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9509170A FR2737259B1 (fr) 1995-07-27 1995-07-27 Circuit de commande de bougies de prechauffage de moteur diesel
FR9509170 1995-07-27

Publications (2)

Publication Number Publication Date
EP0756083A1 EP0756083A1 (de) 1997-01-29
EP0756083B1 true EP0756083B1 (de) 1999-06-16

Family

ID=9481463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960401483 Expired - Lifetime EP0756083B1 (de) 1995-07-27 1996-07-05 Steuerschaltung für Glühkerzen eines Dieselmotors

Country Status (4)

Country Link
EP (1) EP0756083B1 (de)
DE (1) DE69602895T2 (de)
ES (1) ES2135190T3 (de)
FR (1) FR2737259B1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6146472A (ja) * 1984-08-11 1986-03-06 Nippon Denso Co Ltd 大電流開閉回路
JPH01174987A (ja) * 1987-12-29 1989-07-11 Fujitsu Ten Ltd 発熱体の断線検出方式
JP3180250B2 (ja) * 1990-04-16 2001-06-25 日本特殊陶業株式会社 セラミックグロープラグの通電制御装置
JP3123261B2 (ja) * 1992-10-12 2001-01-09 株式会社デンソー グロープラグ制御装置

Also Published As

Publication number Publication date
FR2737259A1 (fr) 1997-01-31
DE69602895T2 (de) 2000-01-13
ES2135190T3 (es) 1999-10-16
FR2737259B1 (fr) 1997-09-12
EP0756083A1 (de) 1997-01-29
DE69602895D1 (de) 1999-07-22

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