EP0756083A1 - Steuerschaltung für Glühkerzen eines Dieselmotors - Google Patents

Steuerschaltung für Glühkerzen eines Dieselmotors Download PDF

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Publication number
EP0756083A1
EP0756083A1 EP96401483A EP96401483A EP0756083A1 EP 0756083 A1 EP0756083 A1 EP 0756083A1 EP 96401483 A EP96401483 A EP 96401483A EP 96401483 A EP96401483 A EP 96401483A EP 0756083 A1 EP0756083 A1 EP 0756083A1
Authority
EP
European Patent Office
Prior art keywords
circuit
computer
mos transistor
relay
mos
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
EP96401483A
Other languages
English (en)
French (fr)
Other versions
EP0756083B1 (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
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 Sagem SA filed Critical Sagem SA
Publication of EP0756083A1 publication Critical patent/EP0756083A1/de
Application granted granted Critical
Publication of EP0756083B1 publication Critical patent/EP0756083B1/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
    • 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

  • This preheating is carried out by specific spark plugs which are controlled by a circuit supplied by the vehicle battery.
  • the control circuit has a timer function, to determine the duration of application of the preheating current, and a power switch function, to ensure the switching of the intense current passing through the spark plugs, which have a resistance of low value.
  • the control circuit uses the engine management computer (microprocessor), which is connected, by a first removable power connector, to the spark plugs and, by a second removable connector for low currents, to the vehicle wiring harness.
  • engine management computer microprocessor
  • a static relay includes a power MOS transistor, which has a very low voltage drop and thus transfers all the battery voltage to a group of spark plugs.
  • the power connector has three terminals, namely a supply terminal, connected directly to the positive terminal of the battery, and two output terminals for supplying two groups of spark plugs connected to ground.
  • the microprocessor is supplied with battery voltage by the second connector, for low currents. Therefore, when the latter is disconnected, the microprocessor is in principle de-energized. This is not the case, however, because the MOS switch lets leakage currents from the positive terminal of the battery pass.
  • the Applicant then had the idea of using the defect presented by the incorrect connection to solve the problem posed, that is to say of using the false mass reference, presented by the outputs going to the candles, as a true ground reference, backup, for a circuit inhibiting the MOS switch as long as the control circuit is not directly connected to the battery ground by the connector for low currents.
  • the invention relates to a circuit for controlling the glow plugs of a diesel engine, comprising a computer and at least one electronic relay controlled by the computer, characterized in that means are provided for connecting the computer to a reference voltage (ground) through the spark plugs.
  • the control circuit delimited by an axis line in the figure, is carried by a printed circuit board and is housed, in a housing not shown, near the diesel engine of a car. It includes a computer 1 controlling an electronic relay 2 here consisting of a power MOS transistor.
  • a removable connector 3 connects, at the input, the computer 1 to a blade 33 of a relay controlled by the ignition key of the car and to an engine speed sensor 32.
  • the connector 3 connects the computer 1 to earth.
  • a removable connector 4, of power connects respectively, by current input and output terminals 41 and 42, the drain 21 and the source 23 of the MOS 2 to the terminal supplying the voltage + Vb of the battery 30, and to an electrode of a glow plug 31 for the diesel engine, plug connected in addition to the mass of the battery 30.
  • the computer 1 is thus connected to the plug 31 through the MOS 2 and the connector 4. For clarity of the presentation, there is shown only one 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 heating of determined duration in response to the actuation of the ignition key or the starting of the engine.
  • a link circuit 5 shown surrounded by a dotted frame, connects the gate 22 of the MOS 2 to the terminal 42 supplying the spark plug 31. More specifically, the drain 51 of an MOS transistor 50 is connected to the gate 22, normally controlled by the output of circuit 12, while the source 53 of the MOS 50 is connected to the output terminal 42 through a series diode 54 setting a control threshold.
  • a divider bridge consisting 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 indicated, by the ground terminal of the battery 30 through the connector 3.
  • the midpoint of the bridge 55-56 is connected to the gate 52 of the transistor 50 as well as to one end of an integration capacitor 57, 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, instead of the ground (61) when it is not supplied to the card, in order to block MOS 2.
  • the link circuit 5 replaces the circuit 12 to flow towards the ground the parasitic charges accumulated on the grid 22, this flow being effected 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, thus brings back to terminal 42 a pseudo-mass.
  • the connection of the circuit 5 with the current output terminal 42 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 information input, since it provides a voltage reference which is compared with the voltage of the internal ground link 61. As long as the latter is isolated from the ground of the battery 30, by the open connector 3, the divider bridge 55-56 has no mass reference so that its midpoint has a high potential which leads to the conduction of the MOS 50. The latter applies a low resistance between the grid 22 and the source 23 which brings the potential of the grid 22 back to the ground of the spark plug 31, by clearly blocking the MOS 2.
  • the capacitor 57 of the integrator circuit RC: 55-56 / 57 is too high to obtain a determined time constant used to filter the switching operations during connections / disconnection of Connector 3 or during activation / deactivation of commands managed by the computer 1.
  • the link circuit 5 comprises a voltage comparator with two inputs (61 and 42) and two outputs (51, 42) for blocking the MOS 2 by applying a blocking potential between two of these electrodes (22, 23) .
  • the above functions of the link circuit 5 can be performed in various ways and that the power relay controlled can be other than the MOS described here.
  • the concept of the invention could be implemented by integrating the circuit 5 into the control circuit 12.
  • the circuit 5 could for example serve to reference the ground connection (61) of the circuit 12 to the pseudo-mass (42), that is to say that the circuit 5 would not replace the circuit 12 but that it would ensure the correct functioning of the latter, in the rest state, even in the absence real mass (61).
  • the action of circuit 5, for blocking the MOS 2 would thus take place through circuit 12.
  • Separate control of circuit 5 on a specific electrode for blocking the electronic relay is also possible.
  • loopback between the two terminals of the battery, produced by the circuit 5, is independent of any notion of earthing of one or the other terminal of the latter.

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)
  • Stand-By Power Supply Arrangements (AREA)
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
FR9509170 1995-07-27
FR9509170A FR2737259B1 (fr) 1995-07-27 1995-07-27 Circuit de commande de bougies de prechauffage de moteur diesel

Publications (2)

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

Citations (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
JPH041474A (ja) * 1990-04-16 1992-01-06 Ngk Spark Plug Co Ltd セラミックグロープラグの通電制御装置
JPH06129337A (ja) * 1992-10-12 1994-05-10 Nippondenso Co Ltd グロープラグ制御装置

Patent Citations (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
JPH041474A (ja) * 1990-04-16 1992-01-06 Ngk Spark Plug Co Ltd セラミックグロープラグの通電制御装置
JPH06129337A (ja) * 1992-10-12 1994-05-10 Nippondenso Co Ltd グロープラグ制御装置

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 204 (M - 499) 17 July 1986 (1986-07-17) *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 452 (P - 943) 12 October 1989 (1989-10-12) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 141 (M - 1232) 9 April 1992 (1992-04-09) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 432 (M - 1654) 11 August 1994 (1994-08-11) *

Also Published As

Publication number Publication date
FR2737259A1 (fr) 1997-01-31
DE69602895D1 (de) 1999-07-22
EP0756083B1 (de) 1999-06-16
ES2135190T3 (es) 1999-10-16
DE69602895T2 (de) 2000-01-13
FR2737259B1 (fr) 1997-09-12

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