EP0282695B1 - Dispositif de contrôle pour moteur à combustion interne - Google Patents

Dispositif de contrôle pour moteur à combustion interne Download PDF

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Publication number
EP0282695B1
EP0282695B1 EP19880100737 EP88100737A EP0282695B1 EP 0282695 B1 EP0282695 B1 EP 0282695B1 EP 19880100737 EP19880100737 EP 19880100737 EP 88100737 A EP88100737 A EP 88100737A EP 0282695 B1 EP0282695 B1 EP 0282695B1
Authority
EP
European Patent Office
Prior art keywords
microprocessor
storage element
information
control device
memory element
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
EP19880100737
Other languages
German (de)
English (en)
Other versions
EP0282695A1 (fr
Inventor
Wolf Ing. Wessel (Grad.)
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0282695A1 publication Critical patent/EP0282695A1/fr
Application granted granted Critical
Publication of EP0282695B1 publication Critical patent/EP0282695B1/fr
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
    • F02P19/027—Safety devices, e.g. for diagnosing the glow plugs or the related circuits
    • 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

  • the invention is based on a glow time control device according to the preamble of the main claim.
  • glow time control devices are known, for example, from JP-A-58-214676.
  • the glow process of glow plugs in motor vehicles can be controlled with a self-igniting internal combustion engine.
  • the voltage supply can break down, in particular when the vehicle is started.
  • problems are known, for example, from JP-A-59- 685 68.
  • the information stored in the microprocessor is lost when its supply voltage falls below a certain value. This can result in work steps that have already been carried out being repeated by the microprocessor. For example, the information that the preheating of the glow plugs has already ended can be lost through the starting process. Preheating again after starting leads to overloading and thus damage to the glow plugs.
  • the invention has for its object to avoid such renewed glow processes after the supply voltage has broken down.
  • control device with the characterizing features of the main claim has the advantage that optimum operational reliability is ensured even in the event of large voltage fluctuations, in particular voltage breakdowns.
  • information lost due to voltage breakdowns can be input to the microprocessor via at least one memory element, the functionality of which is ensured even at voltages which are below the supply voltage of the microprocessor.
  • memory elements are known for example from EP-A-0130760.
  • the figure shows a section of the circuit of a control unit, namely a microprocessor, a memory element and its wiring.
  • a microprocessor 1 is shown, which is connected via lines 3 and 5 to a voltage supply, not shown. There is, for example, a voltage of +5 V on line 3 and a voltage of -5 V on line 5. The voltages can also be interchanged. One of the lines can also be grounded.
  • the microprocessor 1 has several inputs and outputs. Here is shown an output 7, which is connected via a resistor R1 and a diode D1 to a memory element, which here has a resistor R2 and a capacitor C connected in parallel with R2.
  • the diode D1 is arranged so that its anode is connected to the microprocessor 1 and its cathode to the memory element, specifically to the connection point 9 of R2 and C.
  • connection point 9 The side of the memory element opposite the connection point 9 is connected to the second line 5.
  • a terminal serving as information input 11 is connected to the connection point 9 via a resistor R3 and a diode D2, the cathode of the diode D2 being located at the connection point 9 of the memory element.
  • connection point 9 is connected via a resistor R4 to the first input of an operational amplifier serving as a comparator 13, the output of which is linked to an input 15 of the microprocessor 1.
  • a second input of the comparator 13 is connected to a voltage divider consisting of R5 and R6 located between the first line 3 and the second line 5, specifically to the connection point 17 of the resistors R5 and R6.
  • the microprocessor 1 outputs control signals, for example via a signal output 19.
  • the exemplary embodiment shown is a control unit with only one microprocessor.
  • Various devices can also be controlled in motor vehicles with control devices of this type.
  • the function is to be explained here using a glow time control device for glow plugs in motor vehicles with a self-igniting internal combustion engine.
  • the microprocessor 1 outputs various control signals in succession via the control output 19 in order to control the glow time of the glow plugs of a vehicle. These signals serve, for example, to control the preheating of the glow plugs, but also to keep the glow plugs at a predetermined temperature and to record a failure of the glow plugs.
  • the parallel delivery of control signals via several signal outputs is discussed below.
  • the respective current control signal is output via the output 7 to the memory element, which preferably consists of an RC element.
  • the memory element which preferably consists of an RC element.
  • a connecting line can be provided between the signal output 19 and the memory element.
  • the capacitor C of the memory element is charged by a signal output at the output 7 via R1 and D1.
  • R1 and R2 are dimensioned so that the charging process can be carried out quickly via R1 and D1, while the discharge via R2 takes place only slowly.
  • the time constant of the discharge can be adapted to the switching speed of the control circuit; in this exemplary embodiment it is preferably in a range from 0.3 to 3 s.
  • the diode D1 can also find another equivalent switching element use, which is arranged so that the stored information can not be lost via the output 7, ie a discharge of the capacitor C via the output 7 is excluded.
  • the voltage of the vehicle electrical system and / or the voltage supply of the microprocessor 1 breaks down, i.e. drops to a value at which information stored in the microprocessor proceeds, the information contained in the storage element is retained on the basis of the selected time constant.
  • the microprocessor 1 is designed in such a way that it queries the state of the memory element before emitting control signals. If the information present in the memory element, that is to say that the RC element composed of C and R2 is loaded, is that the preheating of the glow plug has already been completed, the microprocessor 1 no longer emits a control signal which triggers the preheating process. This prevents overheating and unnecessary stress or destruction of the glow plugs.
  • information can also be entered into the memory element independently of signals from the microprocessor 1. In the illustrated embodiment, only one terminal is shown as information input 11. If required, however, several information inputs can also be made at the connection point 9 of the memory element can be provided.
  • the storage element is charged by a starting or starting process via the resistor R3 and the diode D2, in that the information input 11 is connected, for example, to the terminal 50 of the starter when the internal combustion engine is started.
  • the diode D2 serves to ensure that the information entered into the memory element cannot be lost via the information input 11; a discharge of the capacitor C of the memory element via the information input is thus prevented.
  • the capacitor C becomes the voltage at the information input 11 during the starting process charged. This means that if there is a loss of information in the microprocessor due to the breakdown of the supply voltage during the starting process, the storage element contains the same information as is given when the preheating process has been completed: the capacitor C is charged.
  • the microprocessor 1 Before the microprocessor 1 emits control signals via the signal output 19, the status of the memory element is queried, as already shown above. Since the capacitor C was charged during the starting process, the microprocessor receives the same information as after a complete preheating process and skips this step. Overloading of the glow plugs is thus avoided.
  • the information in the memory element is queried via the operational amplifier designed as a comparator 13.
  • the potential at the connection point 9 is compared with the potential present at the connection point 17.
  • the circuit is designed, for example, such that a signal is present at input 15 of microprocessor 1 only when the memory element is loaded. By reversing the inverting and the non-inverting input of the operational amplifier, the opposite is the case: there is no signal at input 15 when the memory element is loaded.
  • the voltage present at the connection point 17 can be predetermined by a suitable choice of the resistances of the voltage divider consisting of R5 and R6. One of these resistors can also be changed, however. To set the required voltage at the second input of the comparator 13, the resistor R4 is provided, which can also be designed to be variable.
  • each of these terminals can be assigned an output terminal corresponding to output 7, each with at least one memory element.
  • the memory elements are supplied or loaded with information via corresponding signals. The information entered into the storage elements must then be given before the control signals are emitted be queried serially or in parallel to avoid repeating control steps that have already been carried out.
  • the control device can also have several microprocessors. These are then each assigned at least one storage element which stores the information entered by the microprocessor even in the event of a voltage breakdown.
  • microprocessor with several output terminals corresponding to the output 7, each of which is connected to a memory element. In this way, several pieces of information or control steps preceding the voltage breakdown can be stored.
  • the memory element described can store and reproduce analog signals.
  • the RC element consisting of R2 and C, which serves as a storage element, can also be replaced by other multi-level storage elements which can store digital information.
  • Such microprocessors that are operated with a supply voltage that is higher than is available in unfavorable cases, for example during the starting process, can also be used in control devices.
  • Capacitors for voltage stabilization or buffering can be omitted.

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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (5)

  1. Dispositif de commande de l'instant d'allumage avec au moins un micro-processeur (1) et au moins un élément de mémoire (R2, C), caractérisé en ce que l'élément de mémoire peut aussi fonctionner avec une tension inférieure à la tension d'alimentation du dispositif de commande et/ou du micro-processeur, et en ce que dans l'élément de mémoire, il est mis en mémoire un signal d'état caractéristique du processus d'allumage, qui est interrogé par le micro-processeur avant la délivrance des signaux de commande, afin d'éviter une répétition du processus d'allumage.
  2. Dispositif de commande de l'instant d'allumage conforme à la revendication 1, caractérisé en ce que l'élément de mémoire (R2, C) est muni d'au moins une entrée d'informations (11), sur laquelle on introduit dans l'élément de mémoire (R2, C) les informations indépendantes du micro-processeur (1).
  3. Dispositif de commande de l'instant d'allumage conforme à la revendication 1 ou 2, caractérisé en ce que pour l'interrogation sur l'information présente dans l'élément de mémoire (R2, C), il est prévu un comparateur (13) branché entre l'élément de mémoire (R2, C) et le micro-processeur (1).
  4. Dispositif de commande de l'instant d'allumage conforme à la revendication 3, caractérisé en ce qu'on peut relier une première entrée du comparateur (13) à un diviseur de tension (R5, R6) placé dans l'alimentation (3, 5) du micro-processeur (1) et une deuxième entrée du comparateur (13) à l'élément de mémoire (R2, C).
  5. Dispositif de commande de l'instant d'allumage conforme à l'une des revendications 1 à 4, caractérisé en ce que l'élément de mémoire comporte au moins une résistance (R2) ainsi qu'au moins un condensateur (C) branché en parallèle sur la résistance (R2).
EP19880100737 1987-02-17 1988-01-20 Dispositif de contrôle pour moteur à combustion interne Expired - Lifetime EP0282695B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873704938 DE3704938A1 (de) 1987-02-17 1987-02-17 Steuergeraet fuer brennkraftmaschinen
DE3704938 1987-02-17

Publications (2)

Publication Number Publication Date
EP0282695A1 EP0282695A1 (fr) 1988-09-21
EP0282695B1 true EP0282695B1 (fr) 1992-01-02

Family

ID=6321138

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880100737 Expired - Lifetime EP0282695B1 (fr) 1987-02-17 1988-01-20 Dispositif de contrôle pour moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP0282695B1 (fr)
JP (1) JPS63253177A (fr)
DE (2) DE3704938A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4409286C1 (de) * 1994-03-18 1995-08-10 Audi Ag Verfahren zum Erkennen der Ursache eines Reset-Vorgangs eines durch einen Mikroprozessor gesteuerten Systems sowie Schaltung zum Durchführen des Verfahrens

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19634320A1 (de) * 1996-08-24 1998-02-26 Bosch Gmbh Robert Verfahren und Vorrichtung zur Prüfung eines Speicherelements

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130760A2 (fr) * 1983-06-30 1985-01-09 Schlumberger Electronics (U.K.) Limited Mémoires non-volatiles de données
EP0152802A2 (fr) * 1984-02-20 1985-08-28 Renata AG Elément commutateur intégré soutenu par batterie

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130760A2 (fr) * 1983-06-30 1985-01-09 Schlumberger Electronics (U.K.) Limited Mémoires non-volatiles de données
EP0152802A2 (fr) * 1984-02-20 1985-08-28 Renata AG Elément commutateur intégré soutenu par batterie

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4409286C1 (de) * 1994-03-18 1995-08-10 Audi Ag Verfahren zum Erkennen der Ursache eines Reset-Vorgangs eines durch einen Mikroprozessor gesteuerten Systems sowie Schaltung zum Durchführen des Verfahrens

Also Published As

Publication number Publication date
JPS63253177A (ja) 1988-10-20
EP0282695A1 (fr) 1988-09-21
DE3704938A1 (de) 1988-08-25
DE3867263D1 (de) 1992-02-13

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