EP0167038A1 - Méthode et dispositif de détection du mauvais fonctionnement d'un appareil de chauffage à combustible liquide - Google Patents

Méthode et dispositif de détection du mauvais fonctionnement d'un appareil de chauffage à combustible liquide Download PDF

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Publication number
EP0167038A1
EP0167038A1 EP85107294A EP85107294A EP0167038A1 EP 0167038 A1 EP0167038 A1 EP 0167038A1 EP 85107294 A EP85107294 A EP 85107294A EP 85107294 A EP85107294 A EP 85107294A EP 0167038 A1 EP0167038 A1 EP 0167038A1
Authority
EP
European Patent Office
Prior art keywords
output
heater
shift register
test circuit
memory
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
EP85107294A
Other languages
German (de)
English (en)
Other versions
EP0167038B1 (fr
Inventor
Fritz Reuter
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.)
Eberspaecher Climate Control Systems GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
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 DE19843422451 external-priority patent/DE3422451A1/de
Priority claimed from DE19843423466 external-priority patent/DE3423466A1/de
Application filed by J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP0167038A1 publication Critical patent/EP0167038A1/fr
Application granted granted Critical
Publication of EP0167038B1 publication Critical patent/EP0167038B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/12—Burner simulation or checking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/14—Vehicle heating, the heat being derived otherwise than from the propulsion plant

Definitions

  • the invention relates to a method and a device for detecting the fault state of a heater operated with liquid fuel for vehicles, the heater being assigned a control device for controlling the operating processes, and a display device for displaying the operating state of the heater, and this display by the output signal a function test circuit, with which all operationally essential functions are queried one after the other and determined by a target / actual comparison of the electrical voltage values by means of a query controller.
  • the term heater not only includes the heaters provided for heating a vehicle interior, but also e.g. B. cookers provided in motorhomes or caravans for cooking. Heating gas can also be used as fuel.
  • the vehicles also include boats or construction site equipment such as caterpillars or cranes in which engine-independent heating devices are installed. Motor-independent heaters for vehicles are known, the power supply of which is provided by an on-board battery. These heaters have a control unit for controlling the operating sequence. A display device assigned to the heater illuminates the switching status of the heater as soon as this is switched on.
  • the control unit has it
  • the task of controlling the schedule of operations according to a predefined pattern In particular, the blower motor, the fuel delivery device and the ignition are controlled so that safe operation is possible.
  • the heater components are monitored in terms of their function and timing. In the event of irregularities or malfunctions, the heater is shut down permanently. The cause of the heater shutdown remains stored in the control unit until it is switched off.
  • the functions of the individual components can only be checked by checking each component individually, including the control unit. This requires a great deal of effort, at least to go to a customer service workshop. A check by the operator himself is not possible with the known heaters. As a result, the operator is also unable to repair minor damage himself and the workshop must first carry out a relatively complex diagnosis in order to identify the fault location.
  • a diagnostic system which enables an error to be displayed with the aid of the tachometer and a control lamp. Diagnosis is initiated by establishing a state on sensors that does not usually occur while driving. If the full-load and idle switches are operated simultaneously with the ignition switched on, the diagnostic process begins. Errors that occur are displayed one after the other, with actuation of the brake light switch advancing from one error display to the next. A table shows the mechanic the assignment of the errors to the tachometer display. If all errors are shown, the display starts again with the first. After switching off the ignition, the diagnostic process is finished.
  • the present invention has for its object to provide a method and a device for heaters of the generic type by which it is possible to identify an error that has occurred without any special knowledge, without additional effort, in particular without removing the heater. Proven and reliable components should be used for the process and the setup.
  • each individual output signal of the function test circuit first has an encoder with a subsequent read-only memory for the output code, then a shift register with a takeover clock for the output code into the shift register and an output clock for the shift register and then via an amplifier Power level of the display is supplied in coded form.
  • a device which is characterized by a encoder following the function test circuit with sequence control for comparing the actual / target voltage values on the individual functional elements, from which the signals are fed to a read-only memory for the output code, and then a shift register with a transfer clock for the output code in the shift register and an output clock for the shift register and also a downstream power stage as an amplifier and a display device for displaying the output signals in coded form.
  • Fig. 1 the block circuit for heaters with control and code output is shown schematically and simplified.
  • the heater 1 is equipped with a heater control unit 2. These control devices are known.
  • this control unit 2 is fiction according to the arrangement for the function display integrated. This consists of the query control and fault detection 3 for the heater 1, the subsequent address recoder 4, from which the status signals
  • the query control and fault detection 3 are supplied.
  • a ROM 5 for the output code, from which the output code is fed to a shift register 6.
  • the output clock 7 with the transfer clock t and the shift clock t 2 belongs to this shift register 6.
  • the shift register 6 is followed by a power stage 8, which in the embodiment shown in FIG. 2 has a transistor and from which the signals of the display 9 arranged outside the control unit 2 are supplied.
  • positions 20 ... 35 indicate the functions that have been checked and that are stored as status signals in the control unit. According to FIG. 4, positions 20 ... 23 are reserved for the normal operating state and positions 24 ... 32 individual accidents and positions 33 ... 35 as reserve positions.
  • the query takes place, for example, for a circuit according to FIG. 3.
  • a circuit is shown there which enables a 3-value statement.
  • the target resistance Rs (point A) is compared with the actual resistance Rx (point B) of the unit to be tested. If both potentials are the same, the two gates C and D react in the same way and send each a signal to the gate E, which results in the output of a potential y and the message "System OK "to the following microprocessor or encoder 4 and from there to test memory 5. This completes this query step and the next element can be checked. If potential B is too low compared to potential A, gate C will not respond and there is no "System OK" message for gate E.
  • the encoder 4 acts as an address recoder and converts the status signals from the interrogation control into binary codes, which are then forwarded to the test value memory, a ROM for output codes.
  • the following shift register 6 passes the signals on to the power stage 8.
  • the output code from the test memory 5 is transferred to the shift register 6 in dependence on the transfer clock t 1 with a clock period of 10 s in the exemplary embodiment and then shifted by the shift register 6 in dependence on the shift clock t 2 and output to the power stage 8.
  • an amplifier 8 is arranged as a power stage in front of the display 9a / 9b / 9c.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing And Monitoring For Control Systems (AREA)
EP85107294A 1984-06-16 1985-06-13 Méthode et dispositif de détection du mauvais fonctionnement d'un appareil de chauffage à combustible liquide Expired EP0167038B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19843422451 DE3422451A1 (de) 1984-06-16 1984-06-16 Einrichtung zur erkennung des stoerzustandes eines mit fluessigem brennstoff betriebenen heizgeraetes
DE3422451 1984-06-16
DE19843423466 DE3423466A1 (de) 1984-06-26 1984-06-26 Verfahren zur erkennung des stoerzustandes eines mit fluessigem brennstoff betriebenen heizgeraetes
DE3423466 1985-06-26

Publications (2)

Publication Number Publication Date
EP0167038A1 true EP0167038A1 (fr) 1986-01-08
EP0167038B1 EP0167038B1 (fr) 1987-07-22

Family

ID=25822203

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107294A Expired EP0167038B1 (fr) 1984-06-16 1985-06-13 Méthode et dispositif de détection du mauvais fonctionnement d'un appareil de chauffage à combustible liquide

Country Status (3)

Country Link
EP (1) EP0167038B1 (fr)
CS (1) CS271315B2 (fr)
DE (1) DE3560354D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996013397A1 (fr) * 1994-10-26 1996-05-09 Firma J. Eberspächer Systeme de diagnostic permettant de detecter et d'afficher les fonctions d'un appareil de chauffage d'un vehicule a moteur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4036417C1 (en) * 1990-11-15 1992-04-09 Webasto Ag Fahrzeugtechnik, 8035 Stockdorf, De Test device e.g. vehicle heater - has program memory holding test and diagnostic processes to be controlled

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE665960A (fr) * 1965-06-25 1965-10-18
US3681681A (en) * 1970-11-23 1972-08-01 Lee Auslander Electro analyzer with recycle circuit for simulated testing of furnace control units
US3781161A (en) * 1972-01-03 1973-12-25 Combustion Eng Control logic test circuit
US3999933A (en) * 1974-03-15 1976-12-28 Forney Engineering Company Burner control system
US4076487A (en) * 1976-12-27 1978-02-28 Essex Group, Inc. Ignition and control system for gas burning apparatus
US4099488A (en) * 1975-06-09 1978-07-11 Hunter Investment Company Diesel fueled engine coolant heater
FR2469744A1 (fr) * 1979-11-09 1981-05-22 Honeywell Inc Dispositif de commande de bruleur
US4412328A (en) * 1981-02-04 1983-10-25 The North American Manufacturing Company Electromechanical device drive circuit fault detection apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE665960A (fr) * 1965-06-25 1965-10-18
US3681681A (en) * 1970-11-23 1972-08-01 Lee Auslander Electro analyzer with recycle circuit for simulated testing of furnace control units
US3781161A (en) * 1972-01-03 1973-12-25 Combustion Eng Control logic test circuit
US3999933A (en) * 1974-03-15 1976-12-28 Forney Engineering Company Burner control system
US4099488A (en) * 1975-06-09 1978-07-11 Hunter Investment Company Diesel fueled engine coolant heater
US4076487A (en) * 1976-12-27 1978-02-28 Essex Group, Inc. Ignition and control system for gas burning apparatus
FR2469744A1 (fr) * 1979-11-09 1981-05-22 Honeywell Inc Dispositif de commande de bruleur
US4412328A (en) * 1981-02-04 1983-10-25 The North American Manufacturing Company Electromechanical device drive circuit fault detection apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996013397A1 (fr) * 1994-10-26 1996-05-09 Firma J. Eberspächer Systeme de diagnostic permettant de detecter et d'afficher les fonctions d'un appareil de chauffage d'un vehicule a moteur

Also Published As

Publication number Publication date
EP0167038B1 (fr) 1987-07-22
CS400285A2 (en) 1989-12-13
CS271315B2 (en) 1990-09-12
DE3560354D1 (en) 1987-08-27

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