DE19625270A1 - Vehicle speedometer - Google Patents

Vehicle speedometer

Info

Publication number
DE19625270A1
DE19625270A1 DE1996125270 DE19625270A DE19625270A1 DE 19625270 A1 DE19625270 A1 DE 19625270A1 DE 1996125270 DE1996125270 DE 1996125270 DE 19625270 A DE19625270 A DE 19625270A DE 19625270 A1 DE19625270 A1 DE 19625270A1
Authority
DE
Germany
Prior art keywords
speed
vehicle
signal
navigation system
wheel
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.)
Withdrawn
Application number
DE1996125270
Other languages
German (de)
Inventor
Hans Weiner
Bernd Kahnau
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.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche AG
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 Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Priority to DE1996125270 priority Critical patent/DE19625270A1/en
Publication of DE19625270A1 publication Critical patent/DE19625270A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
    • G01C21/28—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network with correlation of data from several navigational instruments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/52—Determining velocity

Abstract

The vehicle speed is calculated by a revolution counter (4) fitted to at least one wheel. This value is compared with the actual speed as determined by use of a navigation system (8), e.g. Global Positioning System, at pre-set time intervals. The comparator (11) determines a correction factor to be applied to the counter-derived speed by the computer (6) at regular intervals e.g. once daily or after programmed events such as vehicle start or excess of a given speed. In addition to display of the speed on the instrument panel (7), the corrected speed value can be transferred to other control devices in the vehicle e.g. to calculate the distance covered.

Description

Die Erfindung betrifft einen Geschwindigkeitsmesser für Fahrzeuge nach dem Oberbegriff des Patentanspruches 1.The invention relates to a speedometer for vehicles according to the preamble of Claim 1.

Übliche Geschwindigkeitsmesser in Fahrzeugen beruhen auf der Ermittlung von Raddrehzahlen und der nachfolgenden Umrechnung dieser Raddrehzahl in eine Fahrzeuggeschwindigkeit. Für diese Umrechnung wird ein zuvor ermittelter und fester Faktor herangezogen, der von der Dimension des verwendeten Reifens abhängig ist. Durch Verschleiß, unterschiedliche Reifentypen und Toleranzen bei der Herstellung von Reifen ist der Abrollumfang der an einem Fahrzeug verwendeten bzw. verwendbaren Reifen jedoch nicht konstant. Durch den festen Umrechnungsfaktor zwischen Raddrehzahl und tatsächlicher Geschwindigkeit ist somit die Anzeige zur tatsächlichen Geschwindigkeit nur für einen einzigen Abrollumfang korrekt und ansonsten fehlerbehaftet.Usual speedometers in vehicles are based on the determination of wheel speeds and subsequent conversion of this wheel speed into a vehicle speed. For this A previously determined and fixed factor is used for the conversion, which depends on the dimension of the used tire is dependent. Due to wear, different tire types and tolerances the manufacture of tires is the rolling circumference of the used or on a vehicle usable tires but not constant. Due to the fixed conversion factor between The wheel speed and actual speed are therefore the display of the actual speed only correct for a single roll circumference and otherwise faulty.

Demgegenüber liegt der Erfindung die Aufgabe zugrunde, einen Geschwindigkeitsmesser für Fahrzeuge zu schaffen, der unabhängig vom Abrollumfang des Reifens einen geringeren Fehler aufweist.In contrast, the invention has for its object a speedometer for To create vehicles that have a lower error regardless of the rolling circumference of the tire having.

Erfindungsgemäß wird vorgeschlagen, ein Signal eines zur Geschwindigkeitsmessung verwendeten Raddrehzahlgebers in einer Recheneinrichtung, die aus dem Signal des Raddrehzahlgebers ein Geschwindigkeitssignal erzeugt, mit einem Korrekturfaktor zu beaufschlagen. Zur Berechnung dieses Korrekturfaktors wird ein Signal der tatsächlichen Geschwindigkeit des Fahrzeuges mittels eines im Fahrzeug angeordneten Navigationssystemes bestimmt, in einem Vergleicher dieses Signal mit dem Signal des Raddrehzahlgebers verglichen und hieraus der Korrekturfaktor bestimmt, der an die Recheneinheit weitergegeben wird. Durch diese Maßnahme ist in vorteilhafter Weise die Genauigkeit des Geschwindigkeitsmessers erhöht, wobei der Einfluß von unterschiedlichen Reifen, Reifenverschleiß und ähnlichem kompensiert wird. Hiermit verbunden ist eine Verbesserung der Genauigkeit aller Größen, die auf dem Geschwindigkeitssignal beruhen, wie z. B. die Erfassung der zurückgelegten Wegstrecke oder die Berechnung einer noch möglichen Restreichweite des Fahrzeuges. Da sich die Geschwindigkeitsanzeige nicht allein auf das Navigationssystem stützt, ist ferner eine korrekte Anzeige der Geschwindigkeit des Fahrzeuges auch dann sichergestellt, wenn, wie beispielsweise in Tunneln, das Navigationssystem nicht funktionsfähig ist.According to the invention it is proposed to use a signal for speed measurement Wheel speed sensor in a computing device from the signal of the wheel speed sensor Speed signal generated to apply a correction factor. To calculate this Correction factor is a signal of the actual speed of the vehicle using an im Vehicle arranged navigation system determines this signal with the in a comparator Signal of the wheel speed sensor compared and determined from this the correction factor to the Processing unit is passed on. By this measure, the accuracy is advantageous of the speedometer increased, the influence of different tires, tire wear and the like is compensated. This is associated with an improvement in the accuracy of everyone Quantities based on the speed signal, such as e.g. B. the recording of the distance traveled Distance or the calculation of a possible remaining range of the vehicle. Since the Speed display is not based solely on the navigation system, it is also a correct display the speed of the vehicle is also ensured if, for example in tunnels, the navigation system is not functional.

In den Unteransprüchen sind vorteilhafte Weiterbildungen der Erfindung dargestellt. Advantageous developments of the invention are shown in the subclaims.  

Wird, wie weiterhin vorgeschlagen, der Geschwindigkeitsmesser dahingehend ergänzt, daß die Berechnung des Korrekturfaktors nur zu vorgegebenen Zeitpunkten erfolgt, so ist darüber hinaus das Navigationssystem um die dauernde Berechnung der Geschwindigkeit des Fahrzeuges entlastet.As suggested further, the speedometer is supplemented so that the The correction factor is only calculated at predetermined times, so that is beyond Navigation system relieved of the constant calculation of the speed of the vehicle.

Schließlich wird vorgeschlagen, ein Navigationssystem auf der Basis des Global Positioning System, kurz GPS, zu verwenden. Da dieses System weltweit verfügbar ist, ist der Einsatz des Geschwindigkeitsmesser überall möglich.Finally, it is proposed a navigation system based on the Global Positioning System, GPS for short. Since this system is available worldwide, the use of the Speedometer possible anywhere.

Die Erfindung ist nachstehend anhand des in der einzigen Figur dargestellten Ausführungsbeispieles näher erläutert.The invention is based on the embodiment shown in the single figure explained in more detail.

Ein skizzenhaft dargestelltes Fahrzeug 1 ist mit Rädern 2 versehen, die auf einer Fahrbahn abrollen. An einem der Räder 2′ ist ein Drehimpulsgeber 4 vorgesehen, der ein Radgeschwindigkeitssignal vRad erzeugt. Eine nachgeschaltete Recheneinrichtung 6 bestimmt hieraus mit Hilfe eines Korrekturfaktors K die Ist-Geschwindigkeit des Fahrzeuges vist und zeigt diese mit Hilfe eines Anzeiginstrumentes 7 einem nicht gezeigten Fahrer des Fahrzeuges 1 an. Das Fahrzeug ist ferner mit einem Navigationssystem 8 ausgestattet, das mit einer Antenne 9 die Signale von Satelliten 10 empfängt und hieraus mit Hilfe einer an sich bekannten Laufzeitberechnung neben der Position des Fahrzeuges 1 auch die tatsächliche Geschwindigkeit des Fahrzeuges vGPS bestimmt. Einer Vergleichseinrichtung 11 wird sowohl das Signal der tatsächlichen Geschwindigkeit vGPS vom Navigationssystem 8, wie auch das Signal der Radgeschwindigkeit vRad zugeführt. Die Vergleichseinrichtung 11 bestimmt hieraus den Korrekturfaktor K, den sie an die Recheneinrichtung 6 weitergibt. Der Drehimpulsgeber 4, die Recheneionrichtung 6, das Anzeigeinstrument 7 sowie die Vergleichseinrichtung 11 bilden zusammen einen Geschwindigkeitsmesser 5.A sketched vehicle 1 is provided with wheels 2 that roll on a road. On one of the wheels 2 ', a rotary pulse generator 4 is provided, which generates a wheel speed signal v wheel . A downstream computing device 6 determines therefrom by means of a correction factor K, the actual speed of the vehicle is v and displays it by means of a Anzeiginstrumentes 7 a driver of the vehicle 1, not shown in. The vehicle is also equipped with a navigation system 8 , which receives the signals from satellites 10 with an antenna 9 and uses this to determine the actual speed of the vehicle v GPS in addition to the position of the vehicle 1 with the aid of a known runtime calculation . Both the signal of the actual speed v GPS from the navigation system 8 and the signal of the wheel speed v wheel are fed to a comparison device 11 . From this, the comparison device 11 determines the correction factor K, which it passes on to the computing device 6 . The rotary pulse generator 4 , the computing device 6 , the display instrument 7 and the comparison device 11 together form a speedometer 5 .

Die Vergleichsrichtung 11 bestimmt den Korrekturfaktor K zu vorgegebenen Zeitpunkten; diese Berechnung kann beispielsweise in festen Zeitabständen (z. B. 1-mal täglich), wie auch ausgelöst durch vorgegebene Ereignisse (z. B. Start des Kraftfahrzeuges, Überschreiten einer vorgegebenen Geschwindigkeit) erfolgen. In diesem Falle muß das Navigationssystem 8 die tatsächliche Geschwindigkeit vGPS nicht ständig, sondern nur zu den Zeitpunkten bestimmen, zu denen die Vergleichseinrichtung 11 den Korrekturfaktor K berechnet.The comparison direction 11 determines the correction factor K at predetermined times; this calculation can take place, for example, at fixed time intervals (e.g. once a day), as well as triggered by predetermined events (e.g. start of the motor vehicle, exceeding a predetermined speed). In this case, the navigation system 8 does not have to determine the actual speed v GPS continuously, but only at the times at which the comparison device 11 calculates the correction factor K.

Das verwendete Navigationssystem 8 muß berührungslos arbeiten, d. h. es darf nicht die durch die Drehung des Rades 2′ gewonnenen Signale des Drehimpulsgebers 4 verwenden. Im Ausführungsbeispiel arbeitet das Navigationssystem 8 auf der Basis des Global Positioning System, kurz GPS, da dieses System weltweit verfügbar ist. The navigation system 8 used must work without contact, ie it must not use the signals of the rotary encoder 4 obtained by the rotation of the wheel 2 '. In the exemplary embodiment, the navigation system 8 works on the basis of the Global Positioning System, or GPS for short, since this system is available worldwide.

Anstelle der Anzeige der Ist-Geschwindigkeit vist durch das Anzeigeinstrument 7 oder ergänzend hierzu wird das Signal der Ist-Geschwindigkeit vist an andere im Fahrzeug 1 vorgesehene Steuergeräte weitergegeben und hieraus beispielsweise die zurückgelegte Wegstrecke, die Restreichweite des Fahrzeuges oder ähnliches berechnet.Instead of the display of the actual speed v ist by the display instrument 7 or additionally, the signal of the actual speed v ist is passed on to other control devices provided in the vehicle 1 and from this, for example, the distance traveled, the remaining range of the vehicle or the like is calculated.

Claims (3)

1. Geschwindigkeitsmesser für Fahrzeuge mit einem mit zumindest einem Rad (2′) des Fahrzeuges verbundenen Raddrehzahlgeber (4) und einer Recheneinrichtung (6) zur Berechnung eines Signales der Ist-Geschwindigkeit (vist) des Fahrzeuges (1), dadurch gekennzeichnet, daß ein Navigationssystem vorgesehen (8) ist, das ein Signal der tatsächlichen Geschwindigkeit (vGPS) bestimmt und eine Vergleichseinrichtung (11) aus dem Signal des Raddrehzahlgebers (4) und der tatsächlichen Geschwindigkeit (vGPS) ein Korrekturfaktor (K) bestimmt, der von der Recheneinrichtung (6) zur Berechnung der Ist-Geschwindigkeit (vist) herangezogen wird.1. speedometer for vehicles with a with at least one wheel (2 ') of the vehicle wheel speed sensor (4) connected, and a computing means (6) for calculating a signal of the actual speed (v ist) in the vehicle (1), characterized in that a navigation system is provided ( 8 ) which determines a signal of the actual speed (v GPS ) and a comparison device ( 11 ) determines a correction factor (K) from the signal of the wheel speed sensor ( 4 ) and the actual speed (v GPS ) the computing device ( 6 ) is used to calculate the actual speed (v ist ). 2. Geschwindigkeitsmesser nach Anspruch 1, dadurch gekennzeichnet, daß die Bestimmung des Korrekturfaktors (K) zu vorgegebenen Zeitpunkten erfolgt.2. Speedometer according to claim 1, characterized in that the determination of Correction factor (K) takes place at predetermined times. 3. Geschwindigkeitsmesser nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Navigationssystem (8) auf der Basis des Global Positioning System (GPS) arbeitet.3. Speedometer according to claim 1 or 2, characterized in that the navigation system ( 8 ) works on the basis of the Global Positioning System (GPS).
DE1996125270 1996-06-25 1996-06-25 Vehicle speedometer Withdrawn DE19625270A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1996125270 DE19625270A1 (en) 1996-06-25 1996-06-25 Vehicle speedometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1996125270 DE19625270A1 (en) 1996-06-25 1996-06-25 Vehicle speedometer

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DE19625270A1 true DE19625270A1 (en) 1998-01-02

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DE1996125270 Withdrawn DE19625270A1 (en) 1996-06-25 1996-06-25 Vehicle speedometer

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10215009A1 (en) * 2002-04-05 2003-10-23 Daimler Chrysler Ag Motor vehicle velocity determination method in which a velocity measured using the wheel diameter and a transfer function is corrected using a value determined from measuring the approach velocity to a fixed reference point
EP1357363A1 (en) * 2002-04-26 2003-10-29 Pioneer Corporation Method and apparatus for correcting the distance factor of a vehicle distance sensor using GPS
DE10343070A1 (en) * 2003-09-17 2005-04-14 Siemens Ag Method and device for determining a vehicle movement quantity in a vehicle
CN102610105A (en) * 2012-03-20 2012-07-25 广东凌康科技有限公司 Speed measurement device applied to overspeed monitoring on highway
CN102622894A (en) * 2012-03-20 2012-08-01 广东凌康科技有限公司 Freeway overspeed monitoring system
CN102622893A (en) * 2012-03-20 2012-08-01 广东凌康科技有限公司 Freeway overspeed monitoring method
DE102011115668A1 (en) * 2011-09-28 2013-03-28 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Method for determining a speed of a vehicle and vehicle
WO2013186164A1 (en) * 2012-06-11 2013-12-19 Jaguar Land Rover Limited Vehicle and method of control thereof
DE102012024632A1 (en) * 2012-12-17 2014-06-18 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Speedometer for vehicle i.e. motor car, has detecting sensor detecting movement of moving component of powertrain and chassis of vehicle, and evaluation unit deriving speed measurement value from detected motion using algorithm
GB2523095A (en) * 2014-02-12 2015-08-19 Jaguar Land Rover Ltd Apparatus and method for use in a vehicle
DE102014204632A1 (en) * 2014-03-13 2015-09-17 Bayerische Motoren Werke Aktiengesellschaft Control device for determining the average speed of a vehicle
CN110662661A (en) * 2017-05-23 2020-01-07 法国大陆汽车公司 Method for identifying at least one transmitter for monitoring the tyre pressure of a motor vehicle by associating with one of its wheels

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DE2741883B2 (en) * 1977-09-17 1979-12-20 Standard Elektrik Lorenz Ag, 7000 Stuttgart Device for secure distance and speed measurement in track-bound, in particular automatically controlled, means of transport
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JPH07167871A (en) * 1993-12-14 1995-07-04 Matsushita Electric Ind Co Ltd Angular velocity sensor output correcting apparatus
EP0699894A2 (en) * 1994-09-01 1996-03-06 Aisin Aw Co., Ltd. Navigation system

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EP0699894A2 (en) * 1994-09-01 1996-03-06 Aisin Aw Co., Ltd. Navigation system

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10215009A1 (en) * 2002-04-05 2003-10-23 Daimler Chrysler Ag Motor vehicle velocity determination method in which a velocity measured using the wheel diameter and a transfer function is corrected using a value determined from measuring the approach velocity to a fixed reference point
EP1357363A1 (en) * 2002-04-26 2003-10-29 Pioneer Corporation Method and apparatus for correcting the distance factor of a vehicle distance sensor using GPS
US6904383B2 (en) 2002-04-26 2005-06-07 Pioneer Corporation Distance factor learning device, distance factor learning method, distance factor learning program, recording medium recording said program, movement condition computing device, and present position computing device
DE10343070A1 (en) * 2003-09-17 2005-04-14 Siemens Ag Method and device for determining a vehicle movement quantity in a vehicle
DE10343070B4 (en) * 2003-09-17 2007-10-25 Siemens Ag Method and device for determining a vehicle movement quantity in a vehicle
DE102011115668A1 (en) * 2011-09-28 2013-03-28 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Method for determining a speed of a vehicle and vehicle
US8935072B2 (en) 2011-09-28 2015-01-13 GM Global Technology Operations LLC Method for determining the speed of a vehicle and vehicle
CN102622893A (en) * 2012-03-20 2012-08-01 广东凌康科技有限公司 Freeway overspeed monitoring method
CN102610105A (en) * 2012-03-20 2012-07-25 广东凌康科技有限公司 Speed measurement device applied to overspeed monitoring on highway
CN102622894A (en) * 2012-03-20 2012-08-01 广东凌康科技有限公司 Freeway overspeed monitoring system
CN102622893B (en) * 2012-03-20 2014-03-26 广东凌康科技有限公司 Freeway overspeed monitoring method
WO2013186164A1 (en) * 2012-06-11 2013-12-19 Jaguar Land Rover Limited Vehicle and method of control thereof
US9511777B2 (en) 2012-06-11 2016-12-06 Jaguar Land Rover Limited Vehicle and method of control thereof
DE102012024632A1 (en) * 2012-12-17 2014-06-18 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Speedometer for vehicle i.e. motor car, has detecting sensor detecting movement of moving component of powertrain and chassis of vehicle, and evaluation unit deriving speed measurement value from detected motion using algorithm
GB2523095A (en) * 2014-02-12 2015-08-19 Jaguar Land Rover Ltd Apparatus and method for use in a vehicle
GB2523095B (en) * 2014-02-12 2018-01-31 Jaguar Land Rover Ltd Apparatus and method for use in a vehicle
DE102014204632A1 (en) * 2014-03-13 2015-09-17 Bayerische Motoren Werke Aktiengesellschaft Control device for determining the average speed of a vehicle
CN110662661A (en) * 2017-05-23 2020-01-07 法国大陆汽车公司 Method for identifying at least one transmitter for monitoring the tyre pressure of a motor vehicle by associating with one of its wheels
CN110662661B (en) * 2017-05-23 2021-12-21 法国大陆汽车公司 Method for identifying at least one transmitter for monitoring the tyre pressure of a motor vehicle by associating with one of its wheels

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