WO2008104363A2 - Display instrument for a motor vehicle, featuring position recognition - Google Patents

Display instrument for a motor vehicle, featuring position recognition Download PDF

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Publication number
WO2008104363A2
WO2008104363A2 PCT/EP2008/001508 EP2008001508W WO2008104363A2 WO 2008104363 A2 WO2008104363 A2 WO 2008104363A2 EP 2008001508 W EP2008001508 W EP 2008001508W WO 2008104363 A2 WO2008104363 A2 WO 2008104363A2
Authority
WO
WIPO (PCT)
Prior art keywords
pointer
light
indicator
display instrument
signal
Prior art date
Application number
PCT/EP2008/001508
Other languages
German (de)
French (fr)
Other versions
WO2008104363A3 (en
Inventor
Peter Langer
Eckard Unseld
Original Assignee
Johnson Controls Automotive Electronics 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 Johnson Controls Automotive Electronics Gmbh filed Critical Johnson Controls Automotive Electronics Gmbh
Publication of WO2008104363A2 publication Critical patent/WO2008104363A2/en
Publication of WO2008104363A3 publication Critical patent/WO2008104363A3/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D13/00—Component parts of indicators for measuring arrangements not specially adapted for a specific variable
    • G01D13/22—Pointers, e.g. settable pointer
    • G01D13/26—Pointers, e.g. settable pointer adapted to perform a further operation, e.g. making electrical contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/215—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays characterised by the combination of multiple visual outputs, e.g. combined instruments with analogue meters and additional displays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/60—Instruments characterised by their location or relative disposition in or on vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/20—Optical features of instruments
    • B60K2360/33—Illumination features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/40—Hardware adaptations for dashboards or instruments
    • B60K2360/48—Sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/60—Structural details of dashboards or instruments
    • B60K2360/68—Features of instruments
    • B60K2360/698—Pointers of combined instruments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/60—Structural details of dashboards or instruments
    • B60K2360/68—Features of instruments
    • B60K2360/698—Pointers of combined instruments
    • B60K2360/6992—Light conducting pointers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D2213/00—Indexing scheme relating to constructional details of indicators
    • G01D2213/10—Drivers for gauges

Definitions

  • the invention relates to a display instrument for displaying an operating variable of a motor vehicle with a pointer movable in front of a scale whose actual position can be detected by a sensor.
  • a first approach provides to perform the reset of the pointer to a defined position on a regular or occasion basis.
  • the pointer is here moved against a mechanical end stop, the pointer drive being actuated during a period of time which ensures the reaching of the end stop, regardless of the magnitude of the deviation in each case.
  • the actual position of the pointer is determined by a sensor, whereby a downstream electronics match the supposed and actual position, so possibly can perform a compensation of the deviation on the control of the pointer drive.
  • the invention has set itself the task of showing a way to enable a position determination with high accuracy with the lowest possible component cost.
  • the pointer is used to transport a measurement signal.
  • the measuring signal in the region of the pointer tip is coupled into this and guided from there along the pointer in the direction of the axis of rotation, in the vicinity of which a single detector receives the measuring signal.
  • the type and strength of the signal can be used to deduce the position of the pointer tip if signal sources are present along the path running along the scale and traversed by the pointer tip, which are suitable for outputting signals which, with preference, may be encoded in different locations ,
  • signals which, with preference, may be encoded in different locations .
  • the measurement signals can be identical, whereby at a plurality of locations a respective identical measurement signal can be coupled into the pointer tip.
  • light is used as a measuring signal, since today usual pointers are already performed many times photoconductive to be well visible in the dark. It is particularly advantageous to use existing light sources as signal sources for the measuring signal, which cooperates as a whole by a common light source and with this Light guide structure backlit or by several individual elements (for example, LED) each separately generated light generating scale marks is readily possible. For aesthetic reasons, it is customary in the instrument industry to design the scale markings sharply delimited against the scale environment.
  • An advantageous embodiment of a device according to the invention is to provide for the scale illumination a separate, deviating from normal operation mode for measurement purposes. Since it may be sufficient, depending on the design of the display instrument and the resulting error sources (in terms of type and size of possible errors) to make an adjustment between suspected and actual pointer position only occasionally, in this case, the totality of the signal sources or, if the signal sources can be controlled individually, even only the respective, the position of the pointer nearest source operated in increased luminosity, so as to improve the coupling of the measuring signal in the pointer tip, not least in terms of daylight or other ambient light as sources of interference (S / N ratio). Depending on the type of light source, it is even conceivable to overload it at short notice, only for the duration of the measurement, in order to maximize the light output.
  • a further advantageous embodiment of the device according to the invention uses for measurement purposes light which differs from the type of light used for illumination purposes. This makes it possible to superimpose a normal operation of the display instrument Apply measuring mode at the same time, which can be extended to a continuous superposition of both modes.
  • the difference between the two types of light can be, for example, in their frequency, it being possible to use a frequency in the non-visible range for the measuring operation.
  • the difference may also be in the time domain, such as pulsed operation of the light sources. With a correspondingly high, source-different pulse sequence, a light effect can be achieved which gives the impression of continuous light emission to the human eye, but allows the evaluation electronics to differentially distinguish the signal or light sources from one another.
  • a signal source is designed to be portable. This is particularly preferred in cases in which a display instrument is designed for the simultaneous display of a plurality of values.
  • An example of this are speed indicators, which also represent a desired value in addition to the actual value, the latter being a default in connection with an automatic cruise control.
  • the movable signal source may be provided with errors by mechanically moving parts, such as a pointer or a rotatable ring with a pointer tip. In this case, it is possible to perform the adjustment inversely by adjusting the signal source position to an already adjusted position of the pointer, thus restoring a congruent appearance.
  • the movable signal source can be provided in a non-faulty manner, for example as a control of one of a plurality of preferably seamless juxtaposed light sources, which results in an alternative or supplement to the based on static signal sources by means of illuminated scale marker pointer adjustment.
  • FIG. 1 an embodiment of a display instrument according to the invention is illustrated by a schematic diagram.
  • a pointer 11, which is rotatably driven by a motor 10, has a light source 12 serving to illuminate the axis of rotation, as well as a detector 13.
  • light 15 guided in the opposite direction for measuring purposes is shown, which is fed to the detector 13.
  • This light comes from a light source or signal source 16, from where it propagates through an aperture 18 present in the dial 17 and is proportionately coupled into the pointer tip.
  • the source is operated pulsed, as indicated by an integrated into the control electronics 19 assembly 19a.
  • the assembly 19a drives the light source 12, but with a different - preferably orthogonal - pulse pattern supplied by the source 16.
  • FIG. 2 shows a pointer variant for a device according to the invention. Indicated are the underside printing 21, by which a uniform pointer illumination with light components of the light 14 (see Figure 1) is caused, as well as the deviating equipped pointer tip, at the bottom of the surface has a roughened area 22 to there the coupling of the light for measurement purposes from the signal source.
  • FIG. 3 a typical amplitude distribution of the measurement signal, which is affected by external light interference, is sketched after being picked up by the detector 4 or preprocessed by the demodulator 19b (see FIG. 1).
  • the maxima 31 represent pointer positions immediately above the respective signal sources, which are arranged equidistantly in this case.
  • the skilled person understands that with increasing number of local maxima an ever more accurate balance is achieved (possibly by averaging over the entire range of motion of the pointer), with the same effort for the components of the sensor.
  • Figure 4 is a schematic diagram of a portable signal source 41, which is arranged in this case on a below the instrument scale 17 and thus outwardly guided rotary arm 42 to produce about a light spot as a setpoint marker.
  • an aperture 18 according to FIG. 1 can be dispensed with here, provided that, for example, the rotary arm carries a beam-bundling device.
  • the location-variable signal source is formed by the pointer tip 52 of a ring pointer 51 shown in cross-section.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Measuring Devices (AREA)
  • Indicating Measured Values (AREA)

Abstract

The invention relates to a display instrument for representing an operational variable of a motor vehicle. Said display instrument comprises an indicator which can be moved in front of a dial and of which the actual position can be determined using a sensory mechanism. The indicator is used for transmitting a test signal that, in a preferred embodiment, is injected into the indicator in the area of the indicator tip and is conducted from the indicator tip along the indicator in the direction of the axis of rotation, in the proximity of which a single sensor captures the test signal. The type and level of the signal allow conclusions to be drawn about the position of the indicator tip.

Description

Anzeigeinstrument für ein Kraftfahrzeug mit Positionserkennung Indicating instrument for a motor vehicle with position detection
Beschreibungdescription
Die Erfindung betrifft ein Anzeigeinstrument zur Darstellung einer Betriebsgröße eines Kraftfahrzeuges mit einem vor einer Skala beweglichen Zeiger, dessen tatsächliche Position durch eine Sensorik feststellbar ist.The invention relates to a display instrument for displaying an operating variable of a motor vehicle with a pointer movable in front of a scale whose actual position can be detected by a sensor.
Stand der TechnikState of the art
Für den Einsatz von Anzeigeinstrumenten bei Kraftfahrzeugen, bei denen hohe Anforderungen an die Genauigkeit gestellt werden, wie beispielsweise für die Anzeige der Geschwindigkeit, ist die Berücksichtigung von Fehlerquellen erforderlich, um die dadurch entstehenden Abweichungen bestmöglich korrigieren zu können. Insbesondere das Aufsummieren einer größeren Zahl kleiner, für sich genommen vernachlässigbar geringer Abweichungen, verursacht etwa durch Getriebespiel oder Impulsverlust bei der Ansteuerung eines Schrittmotor-Antriebs, kann eine erhebliche Abweichung zwischen mutmaßlicher und tatsächlicher Zeigerposition bedingen.For the use of indicating instruments in motor vehicles, where high demands are made on the accuracy, such as for the display of the speed, the consideration of sources of error is required in order to be able to correct the resulting deviations as best as possible. In particular, the summation of a larger number of small, in itself negligible small deviations, caused for example by gear play or loss of momentum in the control of a stepper motor drive, can cause a significant deviation between suspected and actual pointer position.
Aus dem Stand der Technik sind verschiedene Ansätze bekannt, mit denen man versucht, dieses Problem zu beheben. Ein erster Ansatz sieht vor, turnusmäßig oder anlaßgesteuert die Rücksetzung des Zeigers auf eine definierte Position zu vollziehen. In der Regel wird der Zeiger hier gegen einen mechanischen Endanschlag bewegt, wobei der Zeigerantrieb dabei während einer Zeitdauer angesteuert wird, die das Erreichen des Endan- schlags unabhängig von der Größe der Abweichung in jedem Fall sicherstellt.From the prior art, various approaches are known, with which one tries to solve this problem. A first approach provides to perform the reset of the pointer to a defined position on a regular or occasion basis. As a rule, the pointer is here moved against a mechanical end stop, the pointer drive being actuated during a period of time which ensures the reaching of the end stop, regardless of the magnitude of the deviation in each case.
Gemäß einem zweiten Ansatz wird die tatsächliche Position des Zeigers durch eine Sensorik ermittelt, wodurch eine nachgeordnete Elektronik die vermeintliche und tatsächliche Position miteinander abgleichen, also ggf. eine Kompensation der Abweichung über die Ansteuerung des Zeigerantriebs durchführen kann.According to a second approach, the actual position of the pointer is determined by a sensor, whereby a downstream electronics match the supposed and actual position, so possibly can perform a compensation of the deviation on the control of the pointer drive.
Aus der DE 43 10 060 A1 ist ein analoges Anzeigeinstrument bekannt, bei dem ein auf der Drehachse aufsitzender Zeigerkragen abwechselnd mit infrarotes Licht absorbierenden und reflektierenden Zonen ausgerüstet ist. Im Zusammenwirken mit einer benachbart angeordneten IR - Sende/ Empangseinheit ist damit eine Drehwinkelerfassung möglich, also eine Mehrzahl von Zeigerpositionen mit nur einer Sensoreinrichtung bestimmbar. Da diese Sensorik jedoch vollständig im Bereich der Drehachse angeordnet ist, kann die Genauigkeit der damit erzielbaren Positionserfassung nicht allen Anforderungen genügen.From DE 43 10 060 A1 an analog display instrument is known, in which a seated on the axis of rotation pointer collar is alternately equipped with infrared light absorbing and reflective zones. In cooperation with an adjacently arranged IR transmit / receive unit, a rotational angle detection is thus possible, that is to say a plurality of pointer positions can be determined with only one sensor device. However, since this sensor is completely arranged in the region of the axis of rotation, the accuracy of the position detection achievable therewith can not meet all requirements.
Die DE 198 37 824 A1 beschreibt eine Sensoranordnung für ein Anzeigeinstrument, bei der dieses Problem vermieden wurde, indem eine beispiel- gemäß als Reflexionslichtschranke beschriebene Sensoreinrichtung in der Außenzone des Instruments platziert wurde und so eine Positionsbestimung durch Erfassung der Zeigerspitze ermöglicht. Um eine Mehrzahl von Zeigerpositionen erfassen zu können, wird vorgeschlagen, eine dementsprechende Mehrzahl von Sensoreinrichtungen entlang des Zeigerweges vorzusehen. Nachteilig in diesem Fall ist, daß mit deren Anzahl eine analoge Kostensteigerung bei einem solchen Anzeigeinstrument verbunden ist. AufgabeDE 198 37 824 A1 describes a sensor arrangement for a display instrument, in which this problem was avoided by placing a sensor device described by way of example as a reflection light barrier in the outer zone of the instrument and thus enabling position determination by detecting the pointer tip. In order to be able to detect a plurality of pointer positions, it is proposed to provide a corresponding plurality of sensor devices along the pointer path. A disadvantage in this case is that with their number an analogous cost increase is associated with such a display instrument. task
Die Erfindung hat es sich zur Aufgabe gemacht, einen Weg aufzuzeigen, eine Positionsbestimmung mit hoher Genauigkeit bei möglichst geringem Bauteileaufwand zu ermöglichen.The invention has set itself the task of showing a way to enable a position determination with high accuracy with the lowest possible component cost.
Lösungsolution
Die Aufgabe wird gelöst durch ein gattungsgemäßes Anzeigeinstrument, bei dem der Zeiger zum Transport eines Meßsignals herangezogen wird. In einer bevorzugten Ausführungsform wird dabei das Meßsignal im Bereich der Zeigerspitze in diesen eingekoppelt und von dort längs des Zeigers in Richtung der Drehachse geführt, in deren Nähe ein einziger Detektor das Meßsignal aufnimmt. So kann durch Art und Stärke des Signals auf die Po- sition der Zeigerspitze rückgeschlossen werden, wenn längs des entlang der Skala verlaufenden, von der Zeigerspitze zurückgelegten Weges Signalquellen vorhanden sind, die zur Abgabe von Signalen geeignet sind, welche mit Vorzug ortsverschieden codiert sein können. Somit sind von den Orten der Signalquellen ausgehend ggf. unterschiedliche Meßsignale in die Zeigerspitze einkoppelbar. Alternativ können die Meßsignale sich gleichen, wodurch an mehreren Orten ein jeweils identisches Meßsignal in die Zeigerspitze einkoppelbar ist. In dieser alternativen Ausführungsform ist es bevorzugt, während der Zeigerbewegung einen Zählerstand mitzuführen, anhand dessen eine Signalquelle identifizierbar ist und somit die Ortsinformation abgeleitet werden kann.The object is achieved by a generic display instrument, in which the pointer is used to transport a measurement signal. In a preferred embodiment, the measuring signal in the region of the pointer tip is coupled into this and guided from there along the pointer in the direction of the axis of rotation, in the vicinity of which a single detector receives the measuring signal. Thus, the type and strength of the signal can be used to deduce the position of the pointer tip if signal sources are present along the path running along the scale and traversed by the pointer tip, which are suitable for outputting signals which, with preference, may be encoded in different locations , Thus, starting from the locations of the signal sources possibly different measurement signals can be coupled into the pointer tip. Alternatively, the measurement signals can be identical, whereby at a plurality of locations a respective identical measurement signal can be coupled into the pointer tip. In this alternative embodiment, it is preferred to carry a counter reading during the pointer movement, by means of which a signal source can be identified and thus the location information can be derived.
Mit Vorteil wird Licht als Meßsignal verwendet, da heute übliche Zeiger bereits vielfach lichtleitend ausgeführt sind, um bei Dunkelheit gut sichtbar zu sein. Besonders vorteilhaft ist es, ohnehin vorhandene Lichtquellen als Signalquellen für das Meßsignal heranzuziehen, was bei als Gesamtheit durch eine gemeinsame Lichtquelle und mit dieser zusammenwirkenden Lichtleiterstruktur hinterleuchteten oder durch mehrere einzelne Elemente (beispielsweise LED) jeweils separat lichterzeugend ausgeführten Skalenmarkierungen ohne Weiteres möglich ist. Aus ästhetischen Gründen ist es im Instrumentenbau üblich, die Skalenmarkierungen scharf gegen das Skalenumfeld abgegrenzt auszugestalten. Weil damit zugleich eine deutlich konturierte Blende geschaffen ist, welche eine gute örtliche Abgrenzung des Lichtaustritts erzeugt, leistet dies dem Ortsauflösevermögen einer erfindungsgemäßen Vorrichtung Vorschub, da im Moment, in dem die Zeigerspitze die Grenzzone überstreicht, ein steilflankiger Übergang, somit ein guter Kontrast bei Hell-Dunkel- (bzw. Dunkel-Hell-) Übergang bewirkt ist.Advantageously, light is used as a measuring signal, since today usual pointers are already performed many times photoconductive to be well visible in the dark. It is particularly advantageous to use existing light sources as signal sources for the measuring signal, which cooperates as a whole by a common light source and with this Light guide structure backlit or by several individual elements (for example, LED) each separately generated light generating scale marks is readily possible. For aesthetic reasons, it is customary in the instrument industry to design the scale markings sharply delimited against the scale environment. Because at the same time a clearly contoured aperture is created, which produces a good local delimitation of the light emission, this contributes to the spatial resolution of a device according to the invention, since at the moment in which the pointer tip passes over the border zone, a steep transition, thus a good contrast in Hell Dark (or dark-light) transition is effected.
Eine vorteilhafte Ausführungsform einer erfindungsgemäßen Vorrichtung besteht darin, für die Skalenbeleuchtung eine gesonderte, vom Normalbetrieb abweichende Betriebsart für Meßzwecke vorzusehen. Da es in Abhängigkeit von der Bauart des Anzeigeinstruments und der dadurch bedingten Fehlerquellen (hinsichtlich Art und Größe der möglichen Fehler) ausreichen kann, einen Abgleich zwischen mutmaßlicher und tatsächlicher Zeigerposition lediglich gelegentlich vorzunehmen, kann für diesen Fall die Gesamtheit der Signalquellen oder, sofern die Signalquellen einzeln an- steuerbar sind, sogar nur die jeweilige, der Position des Zeigers nächst- liegende Quelle in erhöhter Leuchtstärke betrieben werden, um so die Einkopplung des Meßsignals in die Zeigerspitze, nicht zuletzt hinsichtlich Tages- oder anderen Umgebungslichts als Störquellen, zu verbessern (S/N- Verhältnis). Je nach Art der Lichtquelle ist es sogar denkbar, diese kurzfristig, nur für die Dauer der Messung, gezielt zu überlasten, um die Lichtabgabe zu maximieren.An advantageous embodiment of a device according to the invention is to provide for the scale illumination a separate, deviating from normal operation mode for measurement purposes. Since it may be sufficient, depending on the design of the display instrument and the resulting error sources (in terms of type and size of possible errors) to make an adjustment between suspected and actual pointer position only occasionally, in this case, the totality of the signal sources or, if the signal sources can be controlled individually, even only the respective, the position of the pointer nearest source operated in increased luminosity, so as to improve the coupling of the measuring signal in the pointer tip, not least in terms of daylight or other ambient light as sources of interference (S / N ratio). Depending on the type of light source, it is even conceivable to overload it at short notice, only for the duration of the measurement, in order to maximize the light output.
Eine weitere vorteilhafte Ausführungsform der erfindungsgemäßen Vorrichtung verwendet für Meßzwecke Licht, welches sich von der Art des Lichtes, die für Beleuchtungszwecke eingesetzt wird, unterscheidet. Damit ist es ermöglicht, eine dem Normalbetrieb des Anzeigeinstruments überlagerte Meßbetriebsart zeitgleich anzuwenden, was bis zu einer kontinuierlichen Überlagerung beider Betriebsarten ausweitbar ist. Die Unterschiedlichkeit der beiden Lichtarten kann beispielsweise in ihrer Frequenz liegen, wobei es möglich ist, für den Meßbetrieb eine Frequenz im nicht sichtbaren Bereich zu verwenden. Die Unterschiedlichkeit kann darüber hinaus in der Zeitdomäne liegen, etwa durch gepulsten Betrieb der Lichtquellen. Bei entsprechend hoher, quellenverschiedener Pulsfolge ist eine Lichtwirkung erzielbar, die für das menschliche Auge den Eindruck kontinuierlicher Lichtabstrahlung ergibt, für die Auswerteelektronik aber die ortsauflösende Unterscheidbarkeit der Signal- bzw. Lichtquellen voneinander ermöglicht.A further advantageous embodiment of the device according to the invention uses for measurement purposes light which differs from the type of light used for illumination purposes. This makes it possible to superimpose a normal operation of the display instrument Apply measuring mode at the same time, which can be extended to a continuous superposition of both modes. The difference between the two types of light can be, for example, in their frequency, it being possible to use a frequency in the non-visible range for the measuring operation. The difference may also be in the time domain, such as pulsed operation of the light sources. With a correspondingly high, source-different pulse sequence, a light effect can be achieved which gives the impression of continuous light emission to the human eye, but allows the evaluation electronics to differentially distinguish the signal or light sources from one another.
In einer weiteren vorteilhaften Ausführungsform ist eine Signalquelle ortsbeweglich ausgeführt. Dies ist besonders bevorzugt in Fällen, bei denen ein Anzeigeinstrument für die zeitgleiche Darstellung einer Mehrzahl von Werten ausgelegt ist. Ein Beispiel dafür sind Geschwindigkeitsanzeiger, die neben dem Ist-Wert auch einen Soll-Wert darstellen, wobei letzterer eine Vorgabe im Zusammenhang mit einer automatischen Geschwindigkeitsregelung sein kann. Der Fachmann erkennt, daß hier eine große Variationsbandbreite von Ausführungsarten der Erfindung eröffnet ist : die ortsbewegliche Signalquelle kann durch mechanisch bewegliche Teile, etwa einen Zeiger oder einen drehbaren Ring mit Zeigerspitze, fehlerbehaftet vorgesehen sein. In diesem Fall ist es möglich, den Abgleich invers durchzuführen, indem die Signalquellenposition auf eine bereits abgeglichene Position des Zeigers justiert und damit ein deckungsgleiches Erscheinungsbild wieder hergestellt wird. Ebenso kann die ortsbewegliche Signalquelle in nicht fehlerbehafteter Weise vorgesehen sein, etwa als Ansteuerung einer aus einer Vielzahl von bevorzugt lückenlos aneinandergereihten Lichtquellen, womit sich eine Alternative oder Ergänzung für den auf statischen Signalquellen mittels erleuchteten Skalenmarkierung basierenden Zeigerabgleich ergibt. FigurenIn a further advantageous embodiment, a signal source is designed to be portable. This is particularly preferred in cases in which a display instrument is designed for the simultaneous display of a plurality of values. An example of this are speed indicators, which also represent a desired value in addition to the actual value, the latter being a default in connection with an automatic cruise control. Those skilled in the art will recognize that there is a wide range of variations of embodiments of the invention disclosed herein: the movable signal source may be provided with errors by mechanically moving parts, such as a pointer or a rotatable ring with a pointer tip. In this case, it is possible to perform the adjustment inversely by adjusting the signal source position to an already adjusted position of the pointer, thus restoring a congruent appearance. Likewise, the movable signal source can be provided in a non-faulty manner, for example as a control of one of a plurality of preferably seamless juxtaposed light sources, which results in an alternative or supplement to the based on static signal sources by means of illuminated scale marker pointer adjustment. characters
Anhand der nachfolgenden Figuren werden einige Aspekte der Erfindung näher erläutert.With reference to the following figures, some aspects of the invention will be explained in more detail.
In der Figur 1 ist anhand eines Prinzip-Schaubilds eine Ausführungsform eines erfindungsgemäßen Anzeigeinstruments verdeutlicht. Ein von einem Motor 10 drehbar angetriebener Zeiger 11 weist drehachsnah eine der Zeigerbeleuchtung dienende Lichtquelle 12 sowie einen Detektor 13 auf. Neben dem in üb- licher Weise entlang des Zeigers zu Beleuchtungsszwecken geführten Licht 14 ist in gegenläufiger Richtung zu Meßzwecken geführtes Licht 15 dargestellt, welches dem Detektor 13 zugeleitet wird. Dieses Licht entstammt einer Lichtquelle bzw. Signalquelle 16, von wo es sich durch eine im Zifferblatt 17 vorhandene Blende 18 ausbreitet und anteilig in die Zeigerspitze eingekoppelt wird. Dabei wird die Quelle gepulst betrieben, wie durch eine in die Ansteuerelektronik 19 integrierte Baugruppe 19a angedeutet. In gleicher weise steuert die Baugruppe 19a die Lichtquelle 12 an, jedoch mit einem von dem der Quelle 16 zugeleiteten verschiedenen - bevorzugt orthogonalen - Impulsmuster.In the figure 1 an embodiment of a display instrument according to the invention is illustrated by a schematic diagram. A pointer 11, which is rotatably driven by a motor 10, has a light source 12 serving to illuminate the axis of rotation, as well as a detector 13. In addition to the light 14, which is guided in a conventional manner along the pointer for illumination purposes, light 15 guided in the opposite direction for measuring purposes is shown, which is fed to the detector 13. This light comes from a light source or signal source 16, from where it propagates through an aperture 18 present in the dial 17 and is proportionately coupled into the pointer tip. The source is operated pulsed, as indicated by an integrated into the control electronics 19 assembly 19a. Similarly, the assembly 19a drives the light source 12, but with a different - preferably orthogonal - pulse pattern supplied by the source 16.
Die Figur 2 zeigt eine Zeigervariante für eine erfindungsgemäße Vorrichtung. Angedeutet sind die unterseitige Bedruckung 21 , durch welche eine gleichmäßige Zeigerausleuchtung mit Lichtanteilen des Lichts 14 (siehe Figur 1) verursacht wird, sowie die abweichend ausgerüstete Zeigerspitze, an deren Unterseite die Oberfläche eine angerauten Bereich 22 aufweist, um dort die Einkopplung des Lichts zu Meßzwecken von der Signalquelle zu ermöglichen.FIG. 2 shows a pointer variant for a device according to the invention. Indicated are the underside printing 21, by which a uniform pointer illumination with light components of the light 14 (see Figure 1) is caused, as well as the deviating equipped pointer tip, at the bottom of the surface has a roughened area 22 to there the coupling of the light for measurement purposes from the signal source.
In der Figur 3 ist ein typischer, etwa durch Fremdlichteinwirkung störgrößenbehafteter Amplitudenverlauf des Meßsignals nach Aufnahme durch den Detektor 4 bzw. Vorverarbeitung durch den Demodulator 19b (siehe Figur 1 ) skizziert. Die Maxima 31 repräsentieren Zeigerpositionen unmittelbar über den jeweiligen Signalquellen, welche in diesem Fall äquidistant angeordnet sind. Der Fachmann versteht, daß mit wachsender Zahl lokaler Maxima ein immer genauerer Abgleich erzielbar ist (gegebenenfalls durch Mittelwertbildung über den gesamten Bewegungsbereich des Zeigers), bei unverändertem Aufwand für die Bauteile der Sensorik.In FIG. 3, a typical amplitude distribution of the measurement signal, which is affected by external light interference, is sketched after being picked up by the detector 4 or preprocessed by the demodulator 19b (see FIG. 1). The maxima 31 represent pointer positions immediately above the respective signal sources, which are arranged equidistantly in this case. The skilled person understands that with increasing number of local maxima an ever more accurate balance is achieved (possibly by averaging over the entire range of motion of the pointer), with the same effort for the components of the sensor.
Figur 4 ist eine Prinzipdarstellung für eine ortsveränderliche Signalquelle 41 , die in diesem Fall auf einem unterhalb der Instrumentenskala 17 und somit verdeckt geführten Dreharm 42 angeordnet ist, um etwa einen Lichtpunkt als Sollwertmarkierung zu erzeugen. Je nach Ausführung kann hier auf eine Blende 18 gemäß Figur 1 verzichtet werden, sofern etwa der Dreharm eine Strahlbündelungsvorrichtung mitführt.Figure 4 is a schematic diagram of a portable signal source 41, which is arranged in this case on a below the instrument scale 17 and thus outwardly guided rotary arm 42 to produce about a light spot as a setpoint marker. Depending on the design, an aperture 18 according to FIG. 1 can be dispensed with here, provided that, for example, the rotary arm carries a beam-bundling device.
In Figur 5 ist die ortsveränderliche Signalquelle durch die Zeigerspitze 52 eines im Querschnitt andeutungsweise gezeigten Ringzeigers 51 gebildet. In FIG. 5, the location-variable signal source is formed by the pointer tip 52 of a ring pointer 51 shown in cross-section.
Bezugszeichenreference numeral
10 Motor10 engine
11 Zeiger11 pointers
12 Lichtquelle12 light source
13 Detektor13 detector
14 Licht zu Beleuchtungszwecken14 light for lighting purposes
15 Licht zu Meßzwecken15 light for measurement purposes
16 Signalquelle16 signal source
17 Zifferblatt17 dial
18 Blende18 aperture
19 Ansteuerelektronik19 control electronics
19a Baugruppe der Ansteuerelektronik19a module of the control electronics
19b Demodulator19b demodulator
21 Zeigerbedruckung21 pointer imprint
22 Zeigerspitze22 pointer tip
31 Wertemaximum31 maximum value
41 Ortsveränderliche Signalquelle41 Portable signal source
42 Dreharm42 rotary arm
51 Ringzeiger (Querschnitt)51 ring pointer (cross section)
52 Ringzeigerspitze 52 ring pointer tip

Claims

Patentansprüche claims
1. Anzeigeinstrument für ein Fahrzeug, insbesondere ein Kraftfahrzeug, mit einem entlang einer Skala beweglichen Zeiger und Mitteln zur Positions- erkennung des Zeigers, dadurch gekennzeichnet, daß der Zeiger als Übertragungsmittel für ein Meßsignal dient.1. A display instrument for a vehicle, in particular a motor vehicle, with a pointer movable along a scale and means for detecting the position of the pointer, characterized in that the pointer serves as a transmission means for a measurement signal.
2. Anzeigeinstrument gemäß Anspruch 1 , dadurch gekennzeichnet, daß das Meßsignal der Positionserkennung des Zeigers dient.2. Indicating instrument according to claim 1, characterized in that the measuring signal of the position detection of the pointer is used.
3. Anzeigeinstrument gemäß Anspruch 1 , dadurch gekennzeichnet, daß der Transport entlang eines wesentlichen Teils der Haupterstreckung des Zeigers erfolgt.3. Indicating instrument according to claim 1, characterized in that the transport takes place along a substantial part of the main extension of the pointer.
4. Anzeigeinstrument gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Meßsignal in von der Zeigerspitze fortweisender Richtung geführt wird.4. Indicating instrument according to one of the preceding claims, characterized in that the measuring signal is guided in the pointing away from the pointer direction.
5. Anzeigeinstrument gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Meßsignal als elektromagnetische Welle ausgebildet ist.5. Indicating instrument according to one of the preceding claims, characterized in that the measuring signal is designed as an electromagnetic wave.
6. Anzeigeinstrument gemäß Anspruch 5, dadurch gekennzeichnet, daß zumindest eine der verwendeten Wellenlängen im optischen Spektralbereich liegt. 6. Indicating instrument according to claim 5, characterized in that at least one of the wavelengths used is in the optical spectral range.
PCT/EP2008/001508 2007-02-26 2008-02-26 Display instrument for a motor vehicle, featuring position recognition WO2008104363A2 (en)

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DE102007009623.4 2007-02-26
DE102007009623 2007-02-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2848450A3 (en) * 2013-09-11 2015-05-20 Delphi Technologies, Inc. Instrument panel with pointer position detection and pointer back illumination
EP2837521A3 (en) * 2013-07-23 2015-07-29 Delphi Technologies, Inc. Vehicle instrument panel with light source diagnostics

Citations (4)

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Publication number Priority date Publication date Assignee Title
US4631539A (en) * 1983-01-19 1986-12-23 The Scott & Fetzer Company Digital pointer position detector
FR2743882A1 (en) * 1996-01-24 1997-07-25 Magneti Marelli France Position finder for element rotating with respect to printed circuit
FR2770643A1 (en) * 1997-11-06 1999-05-07 Magneti Marelli France Needle indicator incorporating threshold and continuous detection
US6741184B1 (en) * 2002-01-11 2004-05-25 Delphi Technologies, Inc. Pointer position detection using light emitting diodes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4631539A (en) * 1983-01-19 1986-12-23 The Scott & Fetzer Company Digital pointer position detector
FR2743882A1 (en) * 1996-01-24 1997-07-25 Magneti Marelli France Position finder for element rotating with respect to printed circuit
FR2770643A1 (en) * 1997-11-06 1999-05-07 Magneti Marelli France Needle indicator incorporating threshold and continuous detection
US6741184B1 (en) * 2002-01-11 2004-05-25 Delphi Technologies, Inc. Pointer position detection using light emitting diodes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2837521A3 (en) * 2013-07-23 2015-07-29 Delphi Technologies, Inc. Vehicle instrument panel with light source diagnostics
EP2848450A3 (en) * 2013-09-11 2015-05-20 Delphi Technologies, Inc. Instrument panel with pointer position detection and pointer back illumination

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