EP0257343B1 - Cooling fluid temperature indicating device in liquid-cooled internal-combustion engines - Google Patents

Cooling fluid temperature indicating device in liquid-cooled internal-combustion engines Download PDF

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Publication number
EP0257343B1
EP0257343B1 EP19870111090 EP87111090A EP0257343B1 EP 0257343 B1 EP0257343 B1 EP 0257343B1 EP 19870111090 EP19870111090 EP 19870111090 EP 87111090 A EP87111090 A EP 87111090A EP 0257343 B1 EP0257343 B1 EP 0257343B1
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EP
European Patent Office
Prior art keywords
coolant
temperature
value
indicator
temperature sensor
Prior art date
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Expired - Lifetime
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EP19870111090
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German (de)
French (fr)
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EP0257343A2 (en
EP0257343A3 (en
EP0257343B2 (en
Inventor
Erwin Schweiger
Walter Weishaupt
Andrä Schimann
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating, or supervising devices
    • F02B77/089—Safety, indicating, or supervising devices relating to engine temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/16—Indicating devices; Other safety devices concerning coolant temperature

Definitions

  • the invention relates to a coolant temperature display device in liquid-cooled internal combustion engines of a type according to the preamble of claim 1.
  • the pointer position shown on the display device corresponds to the strongly variable signal value of the temperature sensor. Due to these changing display values, the vehicle driver is often unnecessarily unsettled by the display device.
  • the variable display values occur both with and between each individual machine specimen, depending on several influencing factors, the value of which the vehicle driver cannot assess.
  • the essential influencing factors already exist with a single model of an internal combustion engine in the manufacturing tolerances of the coolant-carrying components, such as the machine itself, the cooler and the coolant thermostat, which together show the different display of the actual coolant temperature depending on the other operational conditions Determine influencing factors engine load and ambient temperature.
  • the object of the invention is to design a temperature display device of the known type for modern overpressure cooling systems so that the driver is not unnecessarily unsettled by considerably different temperature display values in the normal operating range.
  • the pointer instrument is controlled so that its display value or pointer position is approximately constant over the range of the normal operating temperature of the coolant, i. H. with almost unchangeable pointer position. This prevents the driver from being unsettled by changing the pointer position within the limits of the normal operating temperature.
  • the display value of the display device is controlled by an additional temperature and / or pressure sensor despite a normal range of coolant temperature when dangerous signal values of the further sensors occur to a display value corresponding to the machine overheating. This can be done by controlling the pointer alone as well as by a conventional combined control of the pointer and an additional commercially available overheating indicator light.
  • a combined control of a display device and an additional optical and / or acoustic overheating warning display device in which a normal coolant temperature and a risk of overheating for the machine due to a machine component temperature sensor and / or a coolant pressure Sensor can be displayed sensibly.
  • a coolant temperature display device in a liquid-cooled internal combustion engine (not shown) consists of a temperature display device 1, which is designed as a pointer instrument, and a temperature sensor 2, which is designed as an NTC resistor and the coolant Temperature T K is exposed.
  • the display device 1 and the sensor 2 are in electrical connection via a line connection 3, which leads to the ground via the sensor 2 and are connected to the display device 1 via a pulse pole connection with a power source, such as a vehicle electrical system, battery or generator.
  • a threshold switch 4 for the machine temperature T M and a threshold switch 5 for the coolant pressure p K are additionally and parallel to each other in a further ground connection.
  • threshold switches 4 and 5 are closed from a predetermined machine component temperature T m or open from a predetermined coolant pressure p K. 1 shows the pointer of the pointer instrument 1 and the switch positions of the threshold switches 4 and 5 in the normal position at the normal operating temperature of the coolant and of the machine component and normal operating pressure of the coolant.
  • an electrical / electronic switching element 6 is interposed, which then interrupts the connecting line 7 between the threshold switch 5 and the line 3 as a function of the voltage value of the line 3 determined by the sensor 2 when the voltage value corresponds to a temperature lower than an average operating temperature of, for example, 80 ° C.
  • the line connection 8 provided for this purpose is of course integrated in the switching element 6 in practice.
  • the pointer position of the pointer instrument 1 depending on the coolant temperature T K, corresponds to the straight-line and dash-dotted line with corresponding pointer angle deflections, which are in the area of the left, usually blue, cold field 1 1 (in the pointer instrument 1, about 0% and in the range of right, usually red field 1 "is approximately 100%.
  • the mass voltage value then applied to the pointer instrument results in an overheating display of the pointer in the area of the right-hand, usually red, warning field 1 "corresponding to the broken line in FIG. 2.
  • a connection of the temperature sensor 2 and the Threshold switches 4 and 5 are shown with an electronic program control device 10 designed as an integrated circuit IC, which has a connection 11 to the pointer instrument 1 and connections to a voltage source.
  • the program control device 10 additionally effects a course of the angular position on the pointer instrument 1, which corresponds to the solid lines in the function diagram according to FIG. 2.
  • the signal values of the temperature sensor 2 in the form of an NTC resistor are evaluated from the coolant temperature T K in the program control device and are supplied by the latter to the pointer instrument 1 in a medium temperature range from 70 to 100 ° C. as a voltage value , which corresponds to an average temperature of 85 ° C.
  • the pointer of the pointer instrument 1 thus has a constant display position in this central region of the coolant temperature.
  • Fluctuations in the pointer which are usually unavoidable when the pointer instrument 1 is actuated directly by the temperature sensor 2, are thus ruled out and uncertainty for the operating personnel or vehicle driver is avoided, which is due to the diverse influencing factors, such as component tolerances of the temperature sensor 2, pointer instrument 1 and coolant -Thermostat as well as different ambient temperature and machine output, can occur.
  • the function diagram according to FIG. 2 shows, for example, temperature and pressure details, which currently correspond to the usual values for liquid-cooled internal combustion engines.
  • the invention can alternatively be used in conjunction with a conventional overheating warning light 1 ", which is arranged either in the pointer instrument 1 in the area of the right overheating warning zone 1" or separately in a dashboard is.
  • the pointer instrument 1 is controlled solely by the temperature sensor 2 via the program control device 10 in accordance with the coolant temperature T K and, on the other hand, the overheating warning lamp 1 "by the voltage value of the temperature sensor 2 via a threshold switch or a corresponding additional threshold switch for the coolant temperature and by at least one of the further threshold switches 4 and 5 for the machine temperature T M and the coolant pressure P K are activated, thus at the same time as a display of normal coolant temperature by the pointer instrument 1, a risk of overheating by the overheating warning light 1 "reasonably represented due to an excessive machine temperature T M and / or an insufficiently low coolant pressure p K.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Fluid Pressure (AREA)

Description

Die Erfindung bezieht sich auf eine Kühlmittel- Temperatur-Anzeigevorrichtung in flüssigkeits-gekühlten Brennkraftmaschinen einer Bauart gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a coolant temperature display device in liquid-cooled internal combustion engines of a type according to the preamble of claim 1.

Bei üblichen Anzeigevorrichtungen dieser Bauart entspricht die am Anzeigegerät wiedergegebene Zeigerstellung dem jeweiligen stark veränderlichen Signalwert des Temperatur-Fühlers. Aufgrund dieser wechselnden Anzeigewerte wird der Fahrzeugführer durch das Anzeigegerät vielfach unnötig verunsichert. Die veränderlichen Anzeigewerte treten sowohl bei als auch zwischen jedem einzelnen Maschinen-Exemplar in Abhängigkeit von mehreren Einflußfaktoren auf, deren Wertigkeit der Fahrzeugführer nicht beurteilen kann. Die wesentlichen Einflußfaktoren bestehen schon bei einem einzigen Baumuster einer Brennkraftmaschine in den Fertigungstoleranzen der kühlmittel-führenden Bauteile, wie die Maschine selbst, der Kühler und der Kühlmittel-Thermostat, die zusammen die jeweils unterschiedliche Anzeige der tatsächlichen Kühlmittel-Temperatur in Abhängigkeit von den weiteren betriebsbedingten Einflußgrößen Motorlast und Umgebungstemperatur bestimmen. Hinzu kommen diejenigen Einflußgrößen, die Abweichungen des Anzeigewertes von dem tatsächlichen Temperaturwert bewirken, nämlich der Temperatur-Fühler und das Temperatur-Anzeigegerät sowie dazwischenliegende Bauteile, die die elektrische Verbindung bewirken. Insgesamt ergibt sich vielfach eine erhebliche Anzeigedifferenz sowohl an verschiedenen Maschinen-Exemplaren bei gleichen Betriebsbedingungen als auch an einem einzigen Maschinen-Exemplar bei verschiedenen Betriebsbedingungen innerhalb des Normal-Betriebs-Bereiches. Aufgabe der Erfindung ist es, eine Temperatur-Anzeigevorrichtung der bekannten Bauart für moderne Überdruck-Kühlsysteme so auszubilden, daß keine unnötige Verunsicherung des Fahrzeugführers durch erheblich unterschiedliche Temperatur-Anzeigewerte im Normalbetriebs-Bereich auftreten. Diese Aufgabe löst die Erfindung mit den im Kennzeichen des Patentanspruches 1 angegebenen Merkmalen. Das Zeigerinstrument wird dabei so gesteuert, daß dessen Anzeigewert bzw. Zeigerstellung über den Bereich der normalen Betriebstemperatur des Kühlmittels etwa gleichbleibend, d. h. mit nahezu unveränderlicher Zeigerstellung, dargestellt wird. Dadurch ist eine Verunsicherung des Fahrzeugführers durch wechselnde Zeigerstellung innerhalb der Grenzen der normalen Betriebstemperatur ausgeschlossen.In conventional display devices of this type, the pointer position shown on the display device corresponds to the strongly variable signal value of the temperature sensor. Due to these changing display values, the vehicle driver is often unnecessarily unsettled by the display device. The variable display values occur both with and between each individual machine specimen, depending on several influencing factors, the value of which the vehicle driver cannot assess. The essential influencing factors already exist with a single model of an internal combustion engine in the manufacturing tolerances of the coolant-carrying components, such as the machine itself, the cooler and the coolant thermostat, which together show the different display of the actual coolant temperature depending on the other operational conditions Determine influencing factors engine load and ambient temperature. In addition, there are those influencing variables which cause the display value to deviate from the actual temperature value, namely the temperature sensor and the temperature display device and components in between which bring about the electrical connection. Overall, there is often a considerable difference in display both on different machine models under the same operating conditions and on a single machine model under different operating conditions within the normal operating range. The object of the invention is to design a temperature display device of the known type for modern overpressure cooling systems so that the driver is not unnecessarily unsettled by considerably different temperature display values in the normal operating range. This object is achieved by the invention with the features specified in the characterizing part of patent claim 1. The pointer instrument is controlled so that its display value or pointer position is approximately constant over the range of the normal operating temperature of the coolant, i. H. with almost unchangeable pointer position. This prevents the driver from being unsettled by changing the pointer position within the limits of the normal operating temperature.

Gemäß Anspruch 2 wird mittels zusätzlicher weiterer Temperatur- und/oder Druckfühler der Anzeigewert des Anzeigegerätes trotz Normalbereich der Kühlmitteltemperatur bei Auftreten gefährlicher Signalwerte der weiteren Fühler auf einen der Maschinen-Überhitzung entsprechenden Anzeigewert gesteuert. Dies kann durch alleinige Ansteuerung des Zeigers als auch durch eine übliche kombinierte Ansteuerung des Zeigers und einer zusätzlichen handelsüblichen Überhitzungs-Anzeigeleuchte erfolgen.According to claim 2, the display value of the display device is controlled by an additional temperature and / or pressure sensor despite a normal range of coolant temperature when dangerous signal values of the further sensors occur to a display value corresponding to the machine overheating. This can be done by controlling the pointer alone as well as by a conventional combined control of the pointer and an additional commercially available overheating indicator light.

Gemäß Anspruch 3 ist eine kombinierte Ansteuerung eines Anzeigegerätes und einer zusätzlichen optischen und/oder akustischen Überhitzungs-Warnanzeigevorrichtung vorgesehen, bei der gleichzeitig eine normale Kühlmitteltemperatur und eine Überhitzungsgefahr für die Maschine aufgrund eines Maschinen-Bauteil-Temperatur-Fühlers und/oder eines Kühlmittel-Druck-Fühlers sinnvoll dargestellt werden.According to claim 3, a combined control of a display device and an additional optical and / or acoustic overheating warning display device is provided, in which a normal coolant temperature and a risk of overheating for the machine due to a machine component temperature sensor and / or a coolant pressure Sensor can be displayed sensibly.

In der Zeichnung ist ein Ausführungsbeispiel und ein Funktions-Diagramm der Erfindung dargestellt.In the drawing, an embodiment and a functional diagram of the invention is shown.

Eine Kühlmittel-Temperatur-Anzeigevorrichtung in einer nicht dargestellten flüssigkeits-gekühlten Brennkraftmaschine besteht gemäß Fig. 1 aus einem Temperatur-Anzeigegerät 1, das als Zeigerinstrument ausgebildet ist, und aus einem Temperatur-Fühler 2, der als NTC-Widerstnd ausgebildet und der Kühlmittel-Temperatur TK ausgesetzt ist. Das Anzeigegerät 1 und der Fühler 2 stehen über eine Leitungsverbindung 3 in elektrischer Verbindung, die über den Fühler 2 zur Masse führt und am Anzeigegerät 1 über einen Pulspol-Anschluß mit einer Stromquelle, wie Fahrzeug-Bordnetz, Batterie oder Generator, in Verbindung stehen. An die Leitung 3 sind zusätzlich und parallel zu einander in je einen weiteren Masseanschluß ein Schwellwertschalter 4 für die Maschinen-Temperatur TM und ein Schwellwertschalter 5 für den Kühlmittel-Druck pK angeschlossen. Diese Schwellenwertschalter 4 und 5 sind ab einer vorbestimmten Maschinen-Bauteil-Temperatur Tm geschlossen bzw. ab einem vorbestimmten Kühlmittel-Druck pK geöffnet. In Fig. 1 sind der Zeiger des Zeigerinstrumentes 1 und die Schaltstellungen der Schwellwertschalter 4 und 5 in Normallage bei Normal-Betriebstemperatur des Kühlmittels und des Maschinen-Bauteiles sowie normalem Betriebsdruck des Kühlmittels dargestellt. Zwischen dem Schwellwertschalter 5 und dessen Anschluß an die Leitung 3 ist ein elektrisches/elektronisches Schaltelement 6 zwischengeschaltet, das in Abhängigkeit von dem vom Fühler 2 bestimmten Spannungswert der Leitung 3 die Verbindungsleitung 7 zwischen dem Schwellwertschalter 5 und der Leitung 3 dann unterbricht, wenn der Spannungswert einer Temperatur niedriger als einer mittleren Betriebstemperatur von beispielsweise 80°C entspricht. Die zu diesem Zweck vorgesehene Leitungsverbindung 8 ist in der Praxis selbstverständlich im Schaltelement 6 integriert.According to FIG. 1, a coolant temperature display device in a liquid-cooled internal combustion engine (not shown) consists of a temperature display device 1, which is designed as a pointer instrument, and a temperature sensor 2, which is designed as an NTC resistor and the coolant Temperature T K is exposed. The display device 1 and the sensor 2 are in electrical connection via a line connection 3, which leads to the ground via the sensor 2 and are connected to the display device 1 via a pulse pole connection with a power source, such as a vehicle electrical system, battery or generator. A threshold switch 4 for the machine temperature T M and a threshold switch 5 for the coolant pressure p K are additionally and parallel to each other in a further ground connection. These threshold switches 4 and 5 are closed from a predetermined machine component temperature T m or open from a predetermined coolant pressure p K. 1 shows the pointer of the pointer instrument 1 and the switch positions of the threshold switches 4 and 5 in the normal position at the normal operating temperature of the coolant and of the machine component and normal operating pressure of the coolant. Between the threshold switch 5 and its connection to the line 3, an electrical / electronic switching element 6 is interposed, which then interrupts the connecting line 7 between the threshold switch 5 and the line 3 as a function of the voltage value of the line 3 determined by the sensor 2 when the voltage value corresponds to a temperature lower than an average operating temperature of, for example, 80 ° C. The line connection 8 provided for this purpose is of course integrated in the switching element 6 in practice.

Die Funktion der vorbeschriebenen Temperatur-Anzeigevorrichtung ist aus dem in Fig. 2 dargestellten Funktionsdiagramm ersichtlich. Danach entspricht die Zeigerstellung des Zeigerinstrumentes 1 in Abhängigkeit von der Kühlmitteltemperatur TK dem geradlinig durchgezogenen und strichpunktierten Linienzug mit entsprechenden Zeiger-Winkelausschlägen, die im Bereich des linken, üblicherweise blauen Kalt-Feldes 11 (im Zeigerinstrument 1 etwa 0% und im Bereich des rechten, üblicherweise roten Feldes 1" etwa 100% beträgt. Sobald einer der beiden Schwellwertschalter 4 und 5 aufgrund einer Überhitzung des zugeordneten Maschinen-Bauteiles, insbesondere des Zylinderkopfes, oder aufgrund eines Abfalles des Kühlmittel-Druckes pK eine Masseverbindung bewirkt, ergibt sich aus dem dann am Zeigerinstrument anliegenden Masse-Spannnungswer eine Überhitzungsanzeige des Zeigers im Bereich des rechten üblicherweise roten Warnfeldes 1" entsprechend dem mit unterbrochenen Linien dargestellten Linienzug in Fig. 2.The function of the temperature display device described above can be seen from the function diagram shown in FIG. 2. According to this, the pointer position of the pointer instrument 1, depending on the coolant temperature T K, corresponds to the straight-line and dash-dotted line with corresponding pointer angle deflections, which are in the area of the left, usually blue, cold field 1 1 (in the pointer instrument 1, about 0% and in the range of right, usually red field 1 "is approximately 100%. As soon as one of the two threshold switches 4 and 5 due to overheating of the associated machine component, in particular the cylinder head, or due to a drop in the coolant pressure p K ei ne ground connection, the mass voltage value then applied to the pointer instrument results in an overheating display of the pointer in the area of the right-hand, usually red, warning field 1 "corresponding to the broken line in FIG. 2.

Anstelle der unmittelbaren Verbindung des Zeigerinstrumentes 1 mit dem Temperatur-Fühler und den Schwellwertschaltern 4 und 5 über die Leitungen 3, 7 und 8 sowie über das Schaltelement 6 ist in Fig. 1 mit unterbrochenen Linienzügen 9 je eine Verbindung des Temperatur-Fühlers 2 und der Schwellwertschalter 4 und 5 mit einer als integrierter Schaltkreis IC ausgebildeten elektronischen Programm-Steuervorrichtung 10 dargestellt, die eine Verbindung 11 dem Zeigerinstrument 1 und Anschlüsse an eine Spannungsquelle aufweist. Neben der vorbeschriebenen Überhitzungs-Anzeige mittels der Schwellwertschalter 4 und 5 bewirkt die Programm-Steuervorrichtung 10 zusätzlich einen Verlauf der Winkelstellung am Zeigerinstrument 1, der der durchgezogenen Linienführung im Funktionsdiagramm nach Fig. 2 entspricht. Zu diesem Zweck werden die Signalwerte des als NTC-Widerstand ausgebildeten Temperatur-Fühlers 2 aus der Kühlmitteltemperatur TK in der Programm-Steuervorrichtung ausgewertet und von dieser in einem mittleren Temperaturbereich von 70 bis 100°C gemäß Fig. 2 dem Zeigerinstrument 1 als Spannungswert zugeführt, der einer mittleren Temperatur von 85°C gleichbleibend entspricht. Damit weist der Zeiger des Zeigerinstrumentes 1 in diesem mittleren Bereich der Kühlmitteltemperatur eine gleichbleibende Anzeigestellung auf. Zeigerschwankungen, die bei unmittelbarer Ansteuerung des Zeigerinstrumentes 1 durch den Temperatur-Fühler 2 üblicherweise unvermeidbar sind, werden somit ausgeschlossen und eine Verunsicherung des Bedienungspersonals bzw. Fahrzeugführers vermieden, die aufgrund der vielseitigen Einflußfaktoren, wie Bauteiltoleranzen von Temperatur-Fühler 2, Zeigerinstrument 1 und Kühlmittel-Thermostat sowie unterschiedliche Umgebungstemperatur und Maschinen-Leistungsabgabe, eintreten kann.Instead of the direct connection of the pointer instrument 1 with the temperature sensor and the threshold switches 4 and 5 via the lines 3, 7 and 8 and via the switching element 6, a connection of the temperature sensor 2 and the Threshold switches 4 and 5 are shown with an electronic program control device 10 designed as an integrated circuit IC, which has a connection 11 to the pointer instrument 1 and connections to a voltage source. In addition to the above-described overheating display by means of the threshold switches 4 and 5, the program control device 10 additionally effects a course of the angular position on the pointer instrument 1, which corresponds to the solid lines in the function diagram according to FIG. 2. For this purpose, the signal values of the temperature sensor 2 in the form of an NTC resistor are evaluated from the coolant temperature T K in the program control device and are supplied by the latter to the pointer instrument 1 in a medium temperature range from 70 to 100 ° C. as a voltage value , which corresponds to an average temperature of 85 ° C. The pointer of the pointer instrument 1 thus has a constant display position in this central region of the coolant temperature. Fluctuations in the pointer, which are usually unavoidable when the pointer instrument 1 is actuated directly by the temperature sensor 2, are thus ruled out and uncertainty for the operating personnel or vehicle driver is avoided, which is due to the diverse influencing factors, such as component tolerances of the temperature sensor 2, pointer instrument 1 and coolant -Thermostat as well as different ambient temperature and machine output, can occur.

Im Funktionsdiagramm nach Fig. 2 sind beispielsweise Temperatur und Druckangaben dargestellt, die derzeit üblichen Werten bei flüssigkeits-gekühlten Brennkraftmaschinen entsprechen.The function diagram according to FIG. 2 shows, for example, temperature and pressure details, which currently correspond to the usual values for liquid-cooled internal combustion engines.

Abweichend von der in Fig. 1 dargestellten und vorstehend beschriebenen Ausbildung kann die Erfindung alternativ in Verbindung mit einer üblichen Überhitzungs-Warnleuchte 1" zur Anwendung kommen, die entweder im Zeigerinstrument 1 im Bereich des rechten Überhitzungs-Wamfeldes 1" oder getrennt in einem Armaturenfeld angeordnet ist. Dabei wird einerseits das Zeigerinstrument 1 allein vom Temperatur-Fühler 2 über die Programm-Steuervorrichtung 10 entsprechend der Kühlmittel-Temperatur TK und andererseits die Überhitzungs-Warnleuchte 1" gleichfalls vom Spannungswert des Temperatur-Fühlers 2 über einen Schwellwertschalter oder einen entsprechenden zusätzlichen Schwellwertschalter für die Kühlmittel-Temperatur sowie von mindestens einem der weiteren Schwellwertschalter 4 und 5 für die Maschinen-Temperatur TM und den Kühlmitteldruck PK angesteuert. Damit wird gleichzeitig mit einer Anzeige normaler Kühlmittel- Temperatur durch das Zeigerinstrument 1 eine Überhitzungsgefahr durch die Überhitzungs-Warnleuchte 1" aufgrund einer überhöhten Maschinen-Temperatur TM und/oder eines unzureichend geringen Kühlmitteldruckes pK sinnvoll dargestellt.In a departure from the configuration shown in FIG. 1 and described above, the invention can alternatively be used in conjunction with a conventional overheating warning light 1 ", which is arranged either in the pointer instrument 1 in the area of the right overheating warning zone 1" or separately in a dashboard is. On the one hand, the pointer instrument 1 is controlled solely by the temperature sensor 2 via the program control device 10 in accordance with the coolant temperature T K and, on the other hand, the overheating warning lamp 1 "by the voltage value of the temperature sensor 2 via a threshold switch or a corresponding additional threshold switch for the coolant temperature and by at least one of the further threshold switches 4 and 5 for the machine temperature T M and the coolant pressure P K are activated, thus at the same time as a display of normal coolant temperature by the pointer instrument 1, a risk of overheating by the overheating warning light 1 "reasonably represented due to an excessive machine temperature T M and / or an insufficiently low coolant pressure p K.

Claims (3)

1. A coolant temperature indicator device in liquid- cooled internal combustion engines, having a coolant temperature sensor which displays a predetermined electrical signal, such as a voltage, resistance and/or switch signal, in dependance upon at least one predetermined temperature value of the coolant, having a coolant temperature indicator formed as a pointer instrument which reproduces the signal of the temperature sensor as an optical temperature indication value, and having a switch device which is connected to the indicator in such a way that the latter effects an indicated value differing from the indicated value effected by the signal value of the coolant temperature sensor, characterised in that an electronic programme control device is connected as a switch device between the coolant temperature sensor and the coolant temperature indicator, which programme control device evaluates the signal values of the coolant temperature sensor and connects to the pointer instrument, in the range of the normal working temperature of the coolant, a signal value remaining at least approximately constant for a mean normal working temperature indication value.
2. A device according to Claim 1, characterised in that an engine component temperature sensor for over-high component temperature and/or a coolant pressure sensor for insufficient coolant pressure are additionally connected to the indicator and/or the programme control device, the signal values of which sensors effect an indicated value of the coolant temperature indicator corresponding to engine overheating in the case of dangerous exceeding of a component temperature limit value or falling short of a temperature-related coolant limit pressure value.
3. A device according to Claim 2, characterised in that an additional optical and/or acoustic overheating warning indicator is switchedon in dependence upon the engine component temperature sensor and/or the coolant pressure sensor, while the pointer indicated value of the indicator at the same time corresponds unchanged to the coolant temperature.
EP87111090A 1986-08-13 1987-07-31 Cooling fluid temperature indicating device in liquid-cooled internal-combustion engines Expired - Lifetime EP0257343B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863627511 DE3627511A1 (en) 1986-08-13 1986-08-13 FUEL TEMPERATURE DISPLAY DEVICE FOR INTERNAL COMBUSTION ENGINES, IN PARTICULAR COOLANT TEMPERATURE INDICATOR DEVICE FOR LIQUID-COOLED INTERNAL COMBUSTION ENGINES
DE3627511 1986-08-13

Publications (4)

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EP0257343A2 EP0257343A2 (en) 1988-03-02
EP0257343A3 EP0257343A3 (en) 1989-03-01
EP0257343B1 true EP0257343B1 (en) 1990-07-18
EP0257343B2 EP0257343B2 (en) 1993-12-01

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EP87111090A Expired - Lifetime EP0257343B2 (en) 1986-08-13 1987-07-31 Cooling fluid temperature indicating device in liquid-cooled internal-combustion engines

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ES (1) ES2016600B3 (en)

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ES2016600B3 (en) 1990-11-16
DE3627511A1 (en) 1988-02-18
EP0257343A2 (en) 1988-03-02
EP0257343A3 (en) 1989-03-01
EP0257343B2 (en) 1993-12-01
DE3763782D1 (en) 1990-08-23

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