EP0315042A1 - Control of a fuel-heated heat source - Google Patents

Control of a fuel-heated heat source Download PDF

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Publication number
EP0315042A1
EP0315042A1 EP88117874A EP88117874A EP0315042A1 EP 0315042 A1 EP0315042 A1 EP 0315042A1 EP 88117874 A EP88117874 A EP 88117874A EP 88117874 A EP88117874 A EP 88117874A EP 0315042 A1 EP0315042 A1 EP 0315042A1
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EP
European Patent Office
Prior art keywords
microprocessor
fuel
heat source
heated heat
microprocessors
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
EP88117874A
Other languages
German (de)
French (fr)
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EP0315042B1 (en
Inventor
Dietmar Manz
Franz-Josef Wertenbruch
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.)
N.V. VAILLANT S.A.
VAILLANT-SCHONEWELLE B.V.
Vaillant Austria GmbH
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Vaillant-Schonewelle BV
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.)
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Publication date
Application filed by Vaillant Austria GmbH, Nv Vaillant Sa, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd, Vaillant-Schonewelle BV filed Critical Vaillant Austria GmbH
Priority to AT88117874T priority Critical patent/ATE89659T1/en
Publication of EP0315042A1 publication Critical patent/EP0315042A1/en
Application granted granted Critical
Publication of EP0315042B1 publication Critical patent/EP0315042B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/08—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/18—Measuring temperature feedwater temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/16—Flame sensors using two or more of the same types of flame sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/10—Fail safe for component failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)

Abstract

Control device for a fuel-heated heat source for limiting a temperature by means of a microprocessor, there being provided in the case of two-channel construction of the microprocessor two actual- value transmitters (8, 9) for the temperature, and the microprocessors comparing the measured values firstly with a desired value (15) and secondly with one another via an exchange function (20) and sending a signal for closing the solenoid valve (6, 25) of the fuel-heated heat source (1) when the desired value is reached or when the actual values in the two microprocessors deviate from one another in excess of a permitted amount or when, on the basis of predetermined limit values for the actual value, there must be a short-circuit or a line disconnection. <IMAGE>

Description

Die vorliegende Erfindung bezieht sich auf eine Steuerung für eine brennstoffbeheizte Wärmequelle gemäß dem Oberbe­griff des Hauptanspruchs.The present invention relates to a control for a fuel-heated heat source according to the preamble of the main claim.

Unter brennstoffbeheizter Wärmequelle ist hier jedwedes gas- oder ölbeheizte Gerät zu verstehen, beispielsweise also ein gas- oder ölbeheizter Speicher, Kessel, Umlauf-­Wasserheizer mit und ohne Brauchwasserbereitung oder Durchlauf-Wasserheizer. Bekanntermaßen benötigen all die­se Geräte eine Flammensicherung, die auch als Feuerungs­automat ausgebildet sein kann. Im Zuge der Zeit bildet man solche Feuerungsautomaten heute schon unter Einbezie­hung der Mikroprozessortechnik aus, wobei sich dann die Möglichkeit erschließt, auch andere Funktionen vom Mikro­prozessor überwachen und steuern zu lassen. Anhand eines Beispiels eines Umlauf-Wasserheizers soll nun beschrieben werden, daß ein Temperaturbegrenzer auf der Basis dieser Technik realisiert werden kann. Ein Ausführungsbeispiel der Erfindung ist anhand der nachfolgenden Beschreibung näher erläutert.Fuel-heated heat source is to be understood here to mean any gas or oil-heated device, for example a gas or oil-heated storage tank, boiler, circulating water heater with and without process water preparation or continuous water heater. As is known, all of these devices require a flame arrester, which can also be designed as an automatic burner control. In the course of time, such burner controls are already being trained with the inclusion of microprocessor technology, which then opens up the possibility of having other functions monitored and controlled by the microprocessor. Using an example of a circulation water heater, it will now be described that a temperature limiter based on this Technology can be realized. An embodiment of the invention is explained in more detail with reference to the following description.

Eine brennstoffbeheizte Wärmequelle 1 besteht im wesent­lichen aus einem Wärmetauscher 2, der an eine Rücklauf­leitung 3 und eine Vorlaufleitung 4 angeschlossen ist und der von einem Brenner 5 beheizt wird, der über eine mit einem Magnetventil 6 versehene Brennstoffzuleitung ge­speist ist. Der Vorlaufleitung 4 sind 2 Temperatur-Ist­wertgeber 8 und 9 zugeordnet, die beispielsweise als temperaturabhängige Widerstände mit NTC- oder PTC-Verhal­ten ausgebildet sind. Auch eine andere Ausgestaltung der Istwertgeber wäre möglich. Auf den zugehörigen Anschluß­leitungen 10 beziehungsweise 11 stehen damit Spannungen an, deren Istwert der Temperatur der Leitung 4 varia­bel ist. Gegebenenfalls könnten die Spannungswerte linea­risiert oder gedämpft sein. Es ist eine Steuerung 12 vorgesehen, die zwei Mikroprozessoren 13 und 14 aufweist, die demgemäß in Zweikanaltechnik aufgebaut ist. Die Lei­tungen 10 und 11 sind beide den Mikroprozessoren zuge­führt. Weiterhin ist ein Sollwertgeber 15 vorgesehen, der über Leitungen 16 und 17 gleichfalls an beide Mikropro­zessoren 13 und 14 angeschlossen ist. Das gleiche gilt für eine Entstörvorrichtung 18, die im wesentlichen aus einem Taster besteht, der über eine Leitung 19 gleich­ falls an beide Prozessoren angeschlossen ist. Die Zu­stände beider Prozessoren können über eine Ausgleichs­leitung 20 auf den jeweils anderen Mikroprozessor über­tragen werden, wobei die Leitung 20 in der Praxis aus einem Leitungsbündel besteht. Je ein Ausgang 21 und 22 beider Prozessoren ist auf ein Sicherheitsabschalt­stufe 23 gegeben, die über eine Leitung 24 mit einer Magnetspule 25 des Magnetventils 6 verbunden ist.A fuel-heated heat source 1 consists essentially of a heat exchanger 2, which is connected to a return line 3 and a flow line 4 and which is heated by a burner 5, which is fed via a fuel supply line provided with a solenoid valve 6. The flow line 4 is assigned 2 actual temperature sensors 8 and 9, which are designed, for example, as temperature-dependent resistors with NTC or PTC behavior. A different configuration of the actual value transmitter would also be possible. Voltages are thus present on the associated connecting lines 10 and 11, the actual value of the temperature of line 4 being variable. If necessary, the voltage values could be linearized or damped. A controller 12 is provided which has two microprocessors 13 and 14, which is accordingly constructed using two-channel technology. Lines 10 and 11 are both fed to the microprocessors. Furthermore, a setpoint generator 15 is provided, which is also connected to both microprocessors 13 and 14 via lines 16 and 17. The same applies to an interference suppression device 18, which essentially consists of a button which is the same via a line 19 if connected to both processors. The states of both processors can be transmitted to the other microprocessor via a compensating line 20, the line 20 in practice consisting of a line bundle. One output 21 and 22 each of the two processors is provided on a safety shutdown stage 23, which is connected via a line 24 to a solenoid 25 of the solenoid valve 6.

Die dargestellte Steuerung arbeitet wie folgt. Nachdem der Brenner 5 über einen nicht dargestellten Feuerungs­automaten in Betrieb genommen wurde, beheizt sein Abgas den Wärmetauscher 2, so daß die Temperatur der Vorlauf­leitung 4 steigt. Die Istwerte der Temperatur werden über die NTC-Widerstände 8 und 9 gemessen und stehen an beiden Mikroprozessoren 13 und 14 an. Sie werden in diesen Mi­kroprozessoren fortlaufend mit dem durch 15 vorgegeben Sollwert verglichen. Es ist möglich, daß die Analogwerte der Temperaturen zunächst vor der Verarbeitung und vor dem Vergleich digitalisiert werden. Jeder Rechner 13 oder 14 erfaßt demgemäß eigenständig die Temperatur entweder an der Vorlaufleitung oder auch bei entsprechender Anord­nung der Istwertgeber 8 und 9 direkt am Lamellenblock oder an Gußkörper des Kessels. Der im Mikroprozessor 13 oder 14 jeweils verarbeitete Temperaturwert wird über die Ausgleichsleitung 20 dem jeweils anderen Mikroprozessor zur Verfügung gestellt. Ergeben sich Abweichungen über ein zulässiges Maß hinaus, so wird über die Ausgangslei­tung 21 oder 22 die Sicherheitsabschaltstufe 23 betätigt, so daß das Magnetventil 6/25 geschlossen wird. Das glei­che geschieht, wenn der verarbeitete Istwert eines der Geber 8 oder 9 im Mikroprozessor 13 oder 14 den Sollwert 15 erreicht, dann veranlaßt der zugehörige Mikroprozessor das Ansprechen der Sicherheitsabschaltstufe und damit ein Schließen des Magnetventils. Es ist demgemäß möglich, so­wohl einerseits die Fühler 8 und 9 zu überwachen, ande­rerseits ist es möglich, bei Ausfall eines Mikroprozes­sors über den anderen eine Sicherheitsabschaltung vorzu­nehmen. Durch den Datentausch ist es auch möglich, daß bei einem defekten Meßwertgeber und dem Defekt des ei­gentlich zugehörigen Mikroprozessors über den Datentausch der andere Mikroprozessor die Abschaltung vornehmen kann. Da jeder Mikroprozessor 13 beziehungsweise 14 sowohl ei­nen Sensorikbereich wie auch einen Abschaltbereich auf­weist, ist es möglich, Abschalten zu können, wenn entwe­der beide Teile eines Mikroprozessors in Ordnung sind oder wenn im einen Mikroprozessor die Sensorik und im an­deren Mikroprozessor die Abschaltfunktion gegeben ist, da über die Austauschleitung 20 zum Abschaltbereich immer der Meßwert gelangen kann.The control shown works as follows. After the burner 5 has been put into operation via a burner control, not shown, its exhaust gas heats the heat exchanger 2, so that the temperature of the feed line 4 rises. The actual values of the temperature are measured via the NTC resistors 8 and 9 and are applied to both microprocessors 13 and 14. In these microprocessors, they are continuously compared with the setpoint specified by 15. It is possible that the analog values of the temperatures are first digitized before processing and before comparison. Accordingly, each computer 13 or 14 independently detects the temperature either on the flow line or, if the actual value transmitters 8 and 9 are arranged accordingly, directly on the lamella block or on the cast body of the boiler. The temperature value processed in each case in the microprocessor 13 or 14 is sent to the other microprocessor in each case via the compensation line 20 made available. If there are deviations beyond a permissible level, the safety shutdown stage 23 is actuated via the output line 21 or 22, so that the solenoid valve 6/25 is closed. The same happens when the processed actual value of one of the transmitters 8 or 9 in the microprocessor 13 or 14 reaches the target value 15, then the associated microprocessor triggers the activation of the safety shutdown stage and thus the closing of the solenoid valve. Accordingly, it is possible both to monitor sensors 8 and 9 on the one hand, and on the other hand, if one microprocessor fails, it is possible to carry out a safety shutdown over the other. The data exchange also makes it possible for the other microprocessor to switch off in the event of a defective transmitter and the defect of the actually associated microprocessor via the data exchange. Since each microprocessor 13 or 14 has both a sensor area and a switch-off area, it is possible to be able to switch off if either both parts of a microprocessor are in order or if the sensor system in one microprocessor and the switch-off function in the other microprocessor are given, because of the exchange line 20 to the switch-off area can always get the measured value.

Weiterhin ist es zweckmäßig vorgesehen, daß in jedem der Mikroprozessoren Geber vorhanden sind, die den ange­schlossenen Meßwertgeber 8 oder 9 daraufhin überwachen, ob eine Leitungsunterbrechung oder ein Kurzschluß des Fühlers vorliegt. Auch dann kann über jeden der beiden Mikroprozessoren eine Abschaltung des Magnetventils vor­genommen werden.Furthermore, it is conveniently provided that in each of the Microprocessor sensors are present which monitor the connected sensor 8 or 9 to determine whether there is an open circuit or a short circuit in the sensor. Even then, the solenoid valve can be switched off via each of the two microprocessors.

Wesentlich für die Erfindung ist, daß die dargestellte Funktion der Mikroprozessoren 13 und 14 insbesondere an gasbeheizten Geräten dann vorhanden ist, wenn der ohnehin benötigte Feuerungsautomat für einen automatischen Be­trieb in Mikroprozessortechnik aufgebaut wird. Der zu­sätzliche Investitionsaufwand in die Steuerung des Gerätes ist dann praktisch Null.It is essential for the invention that the illustrated function of the microprocessors 13 and 14 is present in particular on gas-heated devices when the burner control unit which is required anyway is set up for automatic operation using microprocessor technology. The additional investment in the control of the device is then practically zero.

Claims (2)

1. Steuerungsvorrichtung für eine brennstoffbeheiz­te Wärmequelle zum Begrenzen einer Temperatur mittels eines Mikroprozessors, dadurch gekenn­zeichnet, daß bei zweikanaligem Aufbau des Mikroprozessors zwei Istwertgeber (8, 9) für die Temperatur vorgesehen sind und daß die Mikropro­zessoren die Meßwerte erstens mit einem Sollwert (15) und zum zweiten miteinander über eine Aus­tauschfunktion (20) vergleichen und ein Signal zum Schließen des Magnetventils (6, 25) der brennstoffbeheizten Wärmequelle (1) dann geben, wenn der Sollwert erreicht wird oder wenn die Istwerte in den beiden Mikroprozessoren über ein zulässiges Maß hinaus voneinander abweichen oder wenn aufgrund vorgegebener Grenzwerte für den Istwert ein Kurzschluß oder eine Leitungsunter­ brechung vorhanden sein muß.1. Control device for a fuel-heated heat source for limiting a temperature by means of a microprocessor, characterized in that two actual value transmitters (8, 9) are provided for the temperature in the case of a two-channel structure of the microprocessor, and in that the microprocessors measure the measured values firstly with a setpoint (15) and second, compare them with one another using an exchange function (20) and then give a signal to close the solenoid valve (6, 25) of the fuel-heated heat source (1) when the setpoint is reached or when the actual values in the two microprocessors differ from one another to an admissible extent deviate or if a short circuit or a line undercarriage due to specified limit values for the actual value refraction must be present. 2. Steuerungsvorrichtung nach Anspruch 1, gekenn­zeichnet durch einen Einsatz des Mikroprozessors zur gleichzeitigen Steuerung, Regelung mittels der gleichen Istwertgeber (8, 9).2. Control device according to claim 1, characterized by using the microprocessor for simultaneous control, regulation by means of the same actual value transmitter (8, 9).
EP88117874A 1987-11-06 1988-10-27 Control of a fuel-heated heat source Expired - Lifetime EP0315042B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88117874T ATE89659T1 (en) 1987-11-06 1988-10-27 CONTROL FOR A FUEL HEATED HEAT SOURCE.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3737761 1987-11-06
DE3737761 1987-11-06
DE3827019 1988-08-05
DE3827019 1988-08-05

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EP0315042A1 true EP0315042A1 (en) 1989-05-10
EP0315042B1 EP0315042B1 (en) 1993-05-19

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DE (1) DE3881154D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352217A2 (en) * 1988-07-20 1990-01-24 Joh. Vaillant GmbH u. Co. Process for controlling and supervising a fuel-heated apparatus with the use of at least one microcomputer system, and apparatus to carry out this process

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160197A (en) * 1964-12-08 Bummer safeguard control apparatus
DE2318072A1 (en) * 1973-04-06 1974-10-24 Licentia Gmbh SYSTEM FOR MONITORING AND ERROR REPORTING IN SECURITY EQUIPMENT
DE2638653A1 (en) * 1976-08-27 1978-03-02 Kloeckner & Co Automatic monitoring system for boiler - has several testing points connected to electronic storage elements which processes pulses
US4087229A (en) * 1976-06-28 1978-05-02 Robertshaw Controls Company Automatic fuel ignition system with redundant flame sensing
US4096989A (en) * 1977-06-20 1978-06-27 The Bendix Corporation Monitoring apparatus for redundant control systems
US4251873A (en) * 1978-04-14 1981-02-17 Lucas Industries Limited Digital computing apparatus particularly for controlling a gas turbine engine
FR2587094A1 (en) * 1985-09-07 1987-03-13 Bosch Gmbh Robert Fail-safe security circuit for gas- or oil-fired burner

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160197A (en) * 1964-12-08 Bummer safeguard control apparatus
DE2318072A1 (en) * 1973-04-06 1974-10-24 Licentia Gmbh SYSTEM FOR MONITORING AND ERROR REPORTING IN SECURITY EQUIPMENT
US4087229A (en) * 1976-06-28 1978-05-02 Robertshaw Controls Company Automatic fuel ignition system with redundant flame sensing
DE2638653A1 (en) * 1976-08-27 1978-03-02 Kloeckner & Co Automatic monitoring system for boiler - has several testing points connected to electronic storage elements which processes pulses
US4096989A (en) * 1977-06-20 1978-06-27 The Bendix Corporation Monitoring apparatus for redundant control systems
US4251873A (en) * 1978-04-14 1981-02-17 Lucas Industries Limited Digital computing apparatus particularly for controlling a gas turbine engine
FR2587094A1 (en) * 1985-09-07 1987-03-13 Bosch Gmbh Robert Fail-safe security circuit for gas- or oil-fired burner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352217A2 (en) * 1988-07-20 1990-01-24 Joh. Vaillant GmbH u. Co. Process for controlling and supervising a fuel-heated apparatus with the use of at least one microcomputer system, and apparatus to carry out this process
EP0352217A3 (en) * 1988-07-20 1990-12-12 Joh. Vaillant Gmbh U. Co. Process for controlling and supervising a fuel-heated apparatus with the use of at least one microcomputer system, and apparatus to carry out this process

Also Published As

Publication number Publication date
DE3881154D1 (en) 1993-06-24
EP0315042B1 (en) 1993-05-19

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