EP2306405B1 - Tachograph assembly for a vehicle and sensor assembly for a tachograph - Google Patents
Tachograph assembly for a vehicle and sensor assembly for a tachograph Download PDFInfo
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- EP2306405B1 EP2306405B1 EP10177787.8A EP10177787A EP2306405B1 EP 2306405 B1 EP2306405 B1 EP 2306405B1 EP 10177787 A EP10177787 A EP 10177787A EP 2306405 B1 EP2306405 B1 EP 2306405B1
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- 238000012545 processing Methods 0.000 claims description 9
- 238000011156 evaluation Methods 0.000 description 10
- 230000003750 conditioning effect Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0841—Registering performance data
- G07C5/085—Registering performance data using electronic data carriers
Definitions
- the invention relates to a tachograph assembly according to the preamble of the main claim.
- a tachograph arrangement as seen from the EP 0 829 069 B1 is known, has a pulse generator and a control device, wherein the pulse generator includes a sensor element for generating a modulated electrical signal proportional to the vehicle speed.
- the pulse generator has a circuit arrangement for signal conditioning, which forms a series of rectangular pulses from the signals generated by the sensor element.
- the pulse generator comprises a coding circuit for encoding the rectangular pulses, which may optionally be stored in a memory.
- the pulse generator and the control unit are interconnected by a signal line and a data line, wherein the analog signal line, the signal of the sensor element unencrypted and the data line transmits the encrypted signals to the control unit.
- the control device comprises a logic for decoding the received encrypted signals and a comparator, which compares the decoded signal with the signal transmitted over the signal line to verify the integrity with respect to a defined period.
- the sensor signal delivered via the signal line and the encrypted and / or processed sensor signal sent via the data line are generated by a single sensor.
- a second, independent signal is to be made available for checking the sensor signal supplied via the signal path.
- the pulse generator has a sensor head which has a plurality of spatially spaced-apart sensors.
- the invention has for its object to provide a tachograph arrangement, which is a second, independent signal, ie a signal that is not based on the signal of the first sensor, is provided, and compatible with a tachograph device according to the EP 0 829 069 B1 which is standardized according to an international standard (ISO 16844-3), whereby the interface between sensor and tachograph need not or only to a small extent be adapted.
- a tachograph arrangement which is a second, independent signal, ie a signal that is not based on the signal of the first sensor, is provided, and compatible with a tachograph device according to the EP 0 829 069 B1 which is standardized according to an international standard (ISO 16844-3), whereby the interface between sensor and tachograph need not or only to a small extent be adapted.
- the sensor arrangement is arranged a second sensor for detecting the same parameter for the driving state of the vehicle as the first sensor adjacent to the first sensor, which is provided with a device for generating digital data via a processing unit for processing the sensor signals of the second sensor in combination and the digitized data of the second sensor are transmitted via the data line, a second independent signal is provided to the tachograph to prevent or reduce manipulation, with no additional components are necessary, ie the tachograph arrangement limited to tachograph and sensor array or encoder remains.
- the interfaces are compatible with the standardized tachograph arrangement and there is no need to provide new interfaces, for example to the ABS system or engine control. It must be integrated into the safety arrangements of the standardized tachograph device no foreign components and there are no changes in the manufacturers in the production processes or their vehicle architectures necessary.
- the device for generating digital signals comprises an encryption unit, by means of which the signals of the second sensor or the processed signals of the second sensor can be encrypted in order to increase the security against tampering.
- the apparatus for generating digital signals comprises a counting device for generating an increment of the pulse-wise sensor signals over a predetermined period of time, whereby the tachograph another type of sensor signals for comparison or plausibility with the first sensor signals available also improved the security against manipulation.
- two increments may be provided over different time periods, one based on the first sensor signals and one based on the first sensor signals based on second sensor signals, whereby the flexibility of the plausibility or the comparison is improved.
- a comparison unit for comparing or checking the plausibility of the first sensor signals and the second sensor signals or sensor signals derived therefrom in the tachograph.
- a correlation processing of the first and second sensor signals can be provided for the second signal path. Since possible manipulations could affect both sensors, it is advantageous to use this different from the first signal path evaluation method.
- a correlation evaluation by the correlation unit is preferable if no sensor signals can currently be detected.
- Another way to start the correlation evaluation is in case of failure or suspected manipulation, i. when a deviation signal between the signals of the two signal paths is detected.
- the two adjacent sensors are arranged on a sensor head or on a sensor chip.
- sensor assembly comprises a sensor head 1 with a first sensor or sensor element 2 and a second sensor or sensor element 3, which may be integrated separately in the sensor head 1 or on a single chip.
- the sensor elements 2, 3 are arranged as close as possible to each other.
- the sensor head is associated with a drive gear 4, which is usually a sense wheel connected to the transmission and has a plurality of teeth.
- the sensor elements 2, 3 are formed as Hall elements, which generate a signal due to the change of the magnetic field by the protruding and recessed parts of the drive wheel 4.
- the Hall elements 2, 3 thus provide first and second sensor signals, which are formed as a pulse train and are a measure of the speed of the transmission and thus for the speed and the distance traveled.
- the first sensor element 2 is located in a first signal path 5 and the second sensor element 3 is part of a second Signal path 6.
- the sensor elements 2, 3 are each connected to a signal conditioning 7, 8, for example, a pulse shaper, which forms, for example, rectangular pulses from the ground pulse signals of the sensors 2, 3.
- the square wave signals are supplied by the signal conditioning 7 of an interface 9 for a real time signal, which provides the rectangular pulse train for transmission to the interface of a tachograph, which is indicated by the line, wherein for the sake of simplicity, only tachographs 10 will be discussed below.
- path pulses 11 which are proportional to the speed or speed of the transmission.
- the square pulses of the second sensor element 3 generated by the signal conditioning 8 are fed to a device 12 for generating digital signals, which in the simplest case is an interface 13 which converts the rectangular signals into a digital data signal 12 '.
- a counting and encryption unit 14 is provided between signal conditioning 8 and interface 13, which counts up or sums the supplied rectangular signals within a predetermined period of time, and the counter reading present at the end of the period represents a first increment. This increment is encrypted in each case and supplied to the interface 13 for processing as a data signal.
- a memory may be present which stores corresponding signals.
- the interface 13 thus provides the data signal 12 ', but it can also receive a data signal from the tachograph, not described in more detail, as shown in the EP 0 829 069 B1 can be trained. Also between the counting and encryption unit 14 and the interface 13 is a bidirectional signal exchange.
- a power supply unit 15 denotes a power supply unit, which is usually connected to a power supply in the tachograph.
- the first sensor 2 thus supplies at the output of the interface 9 a so-called real-time signal, which is transmitted to the tachograph 10.
- the second sensor 3 supplies the signals for calculating the increment, which is usually requested regularly by the tachograph and is transmitted in encrypted form to the tachograph via the data line by the sensor arrangement.
- This includes a comparison and plausibility unit which compares the transmitted increment with an increment determined independently from the directly transmitted path pulses (real-time signal) or makes it plausible and generates error messages in case of deviations.
- FIG. 2 another embodiment of a sensor arrangement is shown, wherein like reference numerals designate the same elements.
- another counting and encryption unit is provided, ie the device 12 for generating a digital signal next to the counting and encryption unit 14 after Fig. 1 a comparison and plausibility unit, the in Fig. 2 shown counting, encryption and comparison or plausibility unit is designated by the reference numeral 16.
- This unit 16 receives the smoothed in the signal conditioning 7 and 8 pulse signals 17, 18, which represent the sensor signals of the same scanning wheel 4 scanning sensor elements 2 and 3.
- the comparison or plausibility between the two sensor signals 17, 18 takes place in the unit 16, ie the signals 18 are counted to one increment, at the same time the sensor signals 17 are also incremented and the two increments, the same period are compared in the unit 16 and if they do not match, a data signal representing a deviation or error signal is transmitted to the tachograph 10 via the interface 13.
- Fig. 3 shows another embodiment, here also the same reference numerals designate the same components and their description is omitted.
- the counting and encryption unit 19 receives the information different from the two embodiments Fig. 1 and Fig. 2 is, the processed sensor signals 17 and 18 of the two sensor elements 2 and 3, but differs from the embodiment according to Fig. 1 in that a first increment of the sensor signals 17 over a first time period and a second increment of the sensor signals 18 over a second time period are calculated.
- increments can be interrogated by the tachograph 10 via the data line 12 'and the digital interface 13, wherein a comparison between the respective increments can be made in the tachograph by up-counting the real-time path pulses 11 there, and a deviation can be detected in the tachograph.
- the comparison of the two increments of the sensor signals 17 and 18 may additionally be made in the apparatus for generating a digital signal, ie in addition to the unit 19 is a comparison and plausibility unit corresponding Fig. 2 intended. If the increments deviate, an error signal can again be sent via the data line 12 '.
- a comparison of the real-time signals with one or both increments is additionally made in the tachograph, ie the real-time signal is fed to a counting circuit in the tachograph and counted up for the respective period and compared accordingly.
- the error message of the sensor arrangement on the tachograph can, taking into account the FIGS. 2 and 3 but also be different for the following embodiments.
- a direct specific error message can be transmitted via the data interface 13.
- the tachograph detects an error.
- an error can also be implicitly generated, eg a voltage error which can also be detected by the tachograph.
- the correlation evaluation can be applied only in the event of a failure or suspicion of manipulation of the first signal or only in a state, e.g. Vehicle is stationary, i. no sensor signals, plausibility check. This could be triggered independently by the sensor arrangement, i. if no path pulses are detected by the first sensor 2, this means starting the correlation measurement. However, the correlation evaluation could also be done on request of the tachograph via the data interface.
- a correlator 20 preferably a cross-correlator be supplied. This takes the correlation evaluation before and delivers a value that corresponds to the time interval of the teeth of the Abtastrades 4 in the transmission or this is proportional.
- a subsequent converter unit 21 the time signals supplied by the correlator 20 are converted into pulses and in the subsequent circuit 12 for generating a digital signal, which after that Fig. 1 corresponds, the supplied from the unit 21 pulses 22 are incremented to an increment and according to the embodiment according to Fig. 1 further processed and delivered to the tachograph and there compared with the real-time signals or plausibility.
- FIGS. 5 and 6 In each case alternatives for the sensor arrangement are shown, in which the embodiment according to Fig. 4 with those after Fig. 2 and 3 is combined, ie the pulses of the converter 21 as well as the pulses of the first signal processing of the counting and encryption unit 19 ( Fig. 6 ) and in the other embodiment of the counting, encryption and plausibility unit 16 supplied. The evaluation of the signals is corresponding.
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Description
Die Erfindung betrifft eine Tachographenanordnung nach dem Oberbegriff des Hauptanspruchs.The invention relates to a tachograph assembly according to the preamble of the main claim.
Eine Tachographenanordnung, wie sie aus der
Bei dieser bekannten Tachographenanordnung werden das über die Signalleitung gelieferte Sensorsignal und das über die Datenleitung gesendete verschlüsselte und/oder bearbeitete Sensorsignal von einem einzigen Sensor erzeugt. Um eine Manipulation an der Tachographenanordnung besser zu erkennen, soll ein zweites, unabhängiges Signal zur Überprüfung des über den Signalpfad gelieferten Sensorsignals zur Verfügung gestellt werden.In this known tachograph arrangement, the sensor signal delivered via the signal line and the encrypted and / or processed sensor signal sent via the data line are generated by a single sensor. In order to better detect a manipulation of the tachograph arrangement, a second, independent signal is to be made available for checking the sensor signal supplied via the signal path.
Grundsätzlich ist es bekannt, einen oder mehrere unabhängige Sensoren extern vorzusehen, deren Signale bzw. Signale, die ohnehin im Fahrzeug vorhanden sind, dem Tachographen z.B. über das CAN-Netzwerk für ihre Verarbeitung zur Verfügung zu stellen. Beispielsweise wird in der
Aus
Der Erfindung liegt die Aufgabe zugrunde, eine Tachographenanordnung zu schaffen, der ein zweites, unabhängiges Signal, d.h. ein Signal, das nicht auf dem Signal des ersten Sensors beruht, zur Verfügung gestellt wird, und die kompatibel zu einem Tachographengerät entsprechend der
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des unabhängigen Anspruchs in Verbindung mit seinem Oberbegriff gelöst.This object is achieved by the characterizing features of the independent claim in conjunction with its preamble.
Dadurch, dass die Sensoranordnung einen zweiten Sensor zum Erfassen desselben Parameters für den Fahrzustand des Fahrzeugs wie der erste Sensor benachbart zum ersten Sensor angeordnet ist, der mit einer Vorrichtung zur Erzeugung von digitalen Daten über eine Bearbeitungseinheit zum Bearbeiten der Sensorsignale des zweiten Sensors in Verbindung steht und die digitalisierten Daten des zweiten Sensors über die Datenleitung übertragen werden, wird ein zweites unabhängiges Signal dem Tachographen zur Verhinderung bzw. Reduzierung von Manipulationen zur Verfügung gestellt, wobei keine zusätzlichen Komponenten notwendig sind, d.h. die Tachographenanordnung auf Tachograph und Sensoranordnung bzw. Geber beschränkt bleibt. Weiterhin sind die Schnittstellen kompatibel zu der standardisierten Tachographenanordnung und es müssen keine neuen Schnittstellen, z.B. zum ABS-System oder zur Motorsteuerung vorgesehen werden. Es müssen keine fremden Komponenten in die Sicherheitsanordnungen des standardisierten Tachographengeräts eingebunden werden und es sind auch keine Änderungen bei den Herstellern in den Produktionsprozessen oder deren Fahrzeugarchitekturen notwendig.Characterized in that the sensor arrangement is arranged a second sensor for detecting the same parameter for the driving state of the vehicle as the first sensor adjacent to the first sensor, which is provided with a device for generating digital data via a processing unit for processing the sensor signals of the second sensor in combination and the digitized data of the second sensor are transmitted via the data line, a second independent signal is provided to the tachograph to prevent or reduce manipulation, with no additional components are necessary, ie the tachograph arrangement limited to tachograph and sensor array or encoder remains. Furthermore, the interfaces are compatible with the standardized tachograph arrangement and there is no need to provide new interfaces, for example to the ABS system or engine control. It must be integrated into the safety arrangements of the standardized tachograph device no foreign components and there are no changes in the manufacturers in the production processes or their vehicle architectures necessary.
Durch die in den Unteransprüchen angegebenen Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen möglich.The measures specified in the dependent claims advantageous refinements and improvements are possible.
Vorzugsweise umfasst die Vorrichtung zum Erzeugen von digitalen Signalen eine Verschlüsselungseinheit, durch die die Signale des zweiten Sensors bzw. die bearbeiteten Signale des zweiten Sensors verschlüsselt werden können, um die Manipulationssicherheit zu erhöhen.Preferably, the device for generating digital signals comprises an encryption unit, by means of which the signals of the second sensor or the processed signals of the second sensor can be encrypted in order to increase the security against tampering.
In einem bevorzugten Ausführungsbeispiel weist die Vorrichtung zum Erzeugen von digitalen Signalen eine Zählvorrichtung zum Erzeugen eines Inkrements der impulsweisen Sensorsignale über einen vorgegebenen Zeitraum auf, wodurch dem Tachographen eine andere Art von Sensorsignalen zum Vergleich bzw. zur Plausibilisierung mit den ersten Sensorsignalen zur Verfügung steht, was ebenfalls die Manipulationssicherheit verbessert.In a preferred embodiment, the apparatus for generating digital signals comprises a counting device for generating an increment of the pulse-wise sensor signals over a predetermined period of time, whereby the tachograph another type of sensor signals for comparison or plausibility with the first sensor signals available also improved the security against manipulation.
Vorteilhafterweise können zwei Inkremente über unterschiedliche Zeiträume zur Verfügung gestellt werden, eines, das auf den ersten Sensorsignalen basiert und eines, das auf den zweiten Sensorsignalen basiert, wodurch die Flexibilität der Plausibilisierung bzw. des Vergleichs verbessert wird.Advantageously, two increments may be provided over different time periods, one based on the first sensor signals and one based on the first sensor signals based on second sensor signals, whereby the flexibility of the plausibility or the comparison is improved.
Vorteilhafterweise ist eine Vergleichseinheit zum Vergleich bzw. zur Plausibilisierung der ersten Sensorsignale und der zweiten Sensorsignale bzw. von diesen abgeleiteten Sensorsignalen in dem Tachographen vorgesehen.Advantageously, a comparison unit is provided for comparing or checking the plausibility of the first sensor signals and the second sensor signals or sensor signals derived therefrom in the tachograph.
In einem vorteilhaften Ausführungsbeispiel kann für den zweiten Signalpfad eine Korrelationsverarbeitung der ersten und zweiten Sensorsignale vorgesehen werden. Da mögliche Manipulationen beide Sensoren betreffen könnten, ist es vorteilhaft, dieses zu dem ersten Signalpfad unterschiedliches Auswerteverfahren zu verwenden.In an advantageous embodiment, a correlation processing of the first and second sensor signals can be provided for the second signal path. Since possible manipulations could affect both sensors, it is advantageous to use this different from the first signal path evaluation method.
Da die Korrelationsauswertung rechenaufwendig sein kann, ist eine Korrelationsauswertung durch die Korrelationseinheit dann vorzuziehen, wenn aktuell keine Sensorsignale feststellbar sind. Eine andere Möglichkeit, die Korrelationsauswertung zu starten, ist bei Ausfall oder Manipulationsverdacht, d.h. wenn ein Abweichungssignal zwischen den Signalen der beiden Signalpfade festgestellt wird.Since the correlation evaluation can be computation-intensive, a correlation evaluation by the correlation unit is preferable if no sensor signals can currently be detected. Another way to start the correlation evaluation is in case of failure or suspected manipulation, i. when a deviation signal between the signals of the two signal paths is detected.
Die zwei benachbarten Sensoren sind auf einem Sensorkopf bzw. auf einem Sensorchip angeordnet.The two adjacent sensors are arranged on a sensor head or on a sensor chip.
Es können unterschiedliche Arten von Drehzahl- oder Wegsensoren verwendet werden, vorteilhaft sind Magnetfeldsensoren, bevorzugt Hall-Sensoren.It can be used different types of speed or displacement sensors, advantageous magnetic field sensors, preferably Hall sensors.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Es zeigen:
- Fig. 1
- eine Sensoranordnung nach einem ersten Ausführungsbeispiel der Erfindung,
- Fig. 2
- eine Sensoranordnung nach einem zweiten, nicht unter die Erfindung fallenden Ausführungsbeispiel,
- Fig. 3
- eine Sensoranordnung nach einem dritten, nicht unter die Erfindung fallenden Ausführungsbeispiel,
- Fig. 4
- eine Sensoranordnung nach einem vierten, nicht unter die Erfindung fallenden Ausführungsbeispiel,
- Fig. 5
- eine Sensoranordnung nach einem fünften, nicht unter die Erfindung fallenden Ausführungsbeispiel und
- Fig. 6
- eine Sensoranordnung nach einem sechsten, nicht unter die Erfindung fallenden Ausführungsbeispiel.
- Fig. 1
- a sensor arrangement according to a first embodiment of the invention,
- Fig. 2
- a sensor arrangement according to a second embodiment, not covered by the invention,
- Fig. 3
- a sensor arrangement according to a third embodiment, not covered by the invention,
- Fig. 4
- a sensor arrangement according to a fourth embodiment, not covered by the invention,
- Fig. 5
- a sensor arrangement according to a fifth, not falling under the invention embodiment and
- Fig. 6
- a sensor arrangement according to a sixth, not falling under the invention embodiment.
Die in
Das erste Sensorelement 2 liegt in einem ersten Signalpfad 5 und das zweite Sensorelement 3 ist Bestandteil eines zweiten Signalpfades 6. Die Sensorelemente 2, 3 sind jeweils mit einer Signalaufbereitung 7, 8, beispielsweise einem Impulsformer verbunden, der aus den verschliffenen Impulssignalen der Sensoren 2, 3 z.B. Rechteckimpulse formt. Die Rechtecksignale werden von der Signalaufbereitung 7 einer Schnittstelle 9 für ein Echtzeitsignal geliefert, die die Rechteckimpulsfolge für die Übertragung an die Schnittstelle eines Tachographen bereitstellt, die durch die Linie angedeutet ist, wobei der Einfachheit halber im Folgenden nur von Tachographen 10 gesprochen wird. Am Ausgang liegen somit Wegeimpulse 11 an, die proportional zur Geschwindigkeit bzw. Drehzahl des Getriebes sind.The
Die von der Signalaufbereitung 8 erzeugten Rechteckimpulse des zweiten Sensorelements 3 werden einer Vorrichtung 12 zur Erzeugung von Digitalsignalen zugeführt, die im einfachsten Fall eine Schnittstelle 13 ist, die die Rechtecksignale in ein digitales Datensignal 12' umwandelt. Tatsächlich ist aber zwischen Signalaufbereitung 8 und Schnittstelle 13 eine Zähl- und Verschlüsselungseinheit 14 vorgesehen, die die gelieferten Rechtecksignale innerhalb eines vorgegebenen Zeitraums hochzählt bzw. summiert und der am Ende des Zeitraums vorhandene Zählerstand ein erstes Inkrement darstellt. Dieses Inkrement wird jeweils verschlüsselt und der Schnittstelle 13 zur Aufbereitung als Datensignal zugeführt. Dabei kann selbstverständlich in der Einheit 14 ein Speicher vorhanden sein, der entsprechende Signale speichert. Die Schnittstelle 13 liefert somit das Datensignal 12', wobei sie jedoch auch ein Datensignal von dem nicht näher beschriebenen Tachographen empfangen kann, der wie in der
Mit 15 ist eine Spannungsversorgungseinheit bezeichnet, die üblicherweise mit einer Spannungsversorgung im Tachographen verbunden ist.15 denotes a power supply unit, which is usually connected to a power supply in the tachograph.
Der erste Sensor 2 liefert somit am Ausgang der Schnittstelle 9 ein so genanntes Echtzeitsignal, das an den Tachographen 10 übermittelt wird. Der zweite Sensor 3 liefert die Signale zur Berechnung des Inkrements, das von dem Tachographen üblicherweise regelmäßig angefordert wird und über die Datenleitung von der Sensoranordnung verschlüsselt an den Tachographen übertragen wird. Dieser umfasst eine Vergleichs- und Plausibilisierungseinheit, die das übermittelte Inkrement mit einem aus den direkt übertragenen Wegeimpulsen (Echtzeitsignal) selbständig ermittelten Inkrement vergleicht bzw. plausibilisiert und Fehlermeldungen bei Abweichungen erzeugt..The
In
In einem nicht dargestellten Ausführungsbeispiel kann der Vergleich der beiden Inkremente der Sensorsignale 17 und 18 zusätzlich in der Vorrichtung zur Erzeugung eines digitalen Signals vorgenommen werden, d.h. zusätzlich zu der Einheit 19 ist eine Vergleichs- und Plausibilisierungseinheit entsprechend
Die Fehlermeldung der Sensoranordnung an dem Tachographen kann unter Berücksichtigung der
Da mögliche Manipulationen in den genannten Ausführungsbeispielen immer beide Sensorelemente 2, 3 betreffen, ist es vorteilhaft, ein weiteres zu der Behandlung des ersten Sensorsignals unterschiedliches Auswerteverfahren zu verwenden. Es bietet sich z.B. an, den ersten Signalpfad wie in den ersten drei Ausführungsbeispielen beschrieben, beizubehalten und eine Korrelationsmessung der von beiden Elementen 2, 3 gelieferten Signale, die ähnlich, aber zeitversetzt sind, beispielsweise eine Kreuz-Korrelationsmessung zu integrieren. Im einfachsten Fall wird nur die Zeitdifferenz zwischen dem Wegeimpuls bzw. dem jeweiligen Sensorsignal des ersten und zweiten Sensors bestimmt. Besser wäre eine rechenintensivere Kreuz-Korrelationsauswertung aus den direkten analogen Signalwerten der jeweiligen Hallelemente 2, 3, d.h. vor der Impulsformung bzw. Signalaufbereitung, da durch die starke Mittelwertbildung dieses Verfahrens auch kleinste, möglicherweise stark gestörte Signale ausgewertet werden können.Since possible manipulations in the mentioned exemplary embodiments always relate to both
Um der hohen Rechenleistung entgegenwirken zu können, kann die Korrelationsauswertung erst bei einem Ausfall oder Manipulationsverdacht des ersten Signals angewendet werden oder nur in einem Zustand, z.B. Fahrzeug steht, d.h. keine Sensorsignale, zu plausibilisieren. Dies könnte durch die Sensoranordnung selbständig angestoßen werden, d.h. wenn keine Wegeimpulse vom ersten Sensor 2 festgestellt werden, bedeutet dies ein Starten der Korrelationsmessung. Die Korrelationsauswertung könnte aber auch auf Anforderung des Tachographen über die Datenschnittstelle erfolgen.In order to be able to counteract the high computing power, the correlation evaluation can be applied only in the event of a failure or suspicion of manipulation of the first signal or only in a state, e.g. Vehicle is stationary, i. no sensor signals, plausibility check. This could be triggered independently by the sensor arrangement, i. if no path pulses are detected by the
Ein solches Grundprinzip ist in der
In einer nachfolgenden Wandlereinheit 21 werden die vom Korrelator 20 gelieferten Zeitsignale in Impulse umgewandelt und in der nachfolgenden Schaltung 12 zur Erzeugung eines digitalen Signals, die derjenigen nach
In den
Claims (4)
- Tachograph arrangement for a vehicle having a tachograph (10) and a sensor arrangement for capturing a parameter for the driving state of the vehicle, wherein the sensor arrangement has a first sensor (2), which provides a signal line connected to the tachograph (10) with pulse-like sensor signals, and an apparatus (12) for generating digital signals from the sensor signals which is connected to a data line,
characterized in that
a second sensor (3) for capturing the same parameter is arranged adjacent to the first sensor (2) and is connected to the apparatus (12) for generating digital data via a processing unit (8, 20, 21) for processing the sensor signals from the second sensor (3), wherein the sensors (2, 3) are arranged on a sensor head (1), and wherein the first sensor (2) is in a first signal path (5) to the tachograph (10) and the second sensor (3) is part of a second signal path (6) to the tachograph (10), wherein there is no connection between the first signal path (5) and the second signal path (6), and in that the tachograph (10) comprises a comparison apparatus which is designed in such a manner that it compares the signals from the first sensor (2) which are transmitted via the signal line with the signals from the second sensor (3) which are transmitted via the data line and generates a deviation signal if necessary. - Tachograph arrangement according to Claim 1, characterized in that the apparatus (12) comprises an encryption unit (14, 16, 19) for generating digital signals.
- Tachograph arrangement according to one of Claims 1 to 2, characterized in that the apparatus (12) for generating digital signals has a counting apparatus (14, 16, 19) for generating an increment of the pulsed sensor signals over a predefined period.
- Tachograph arrangement according to one of Claims 1 to 3, characterized in that the sensors (2, 3) are magnetic field sensors.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009042799A DE102009042799A1 (en) | 2009-09-25 | 2009-09-25 | Tachograph assembly for a vehicle and sensor assembly for a tachograph |
Publications (3)
Publication Number | Publication Date |
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EP2306405A2 EP2306405A2 (en) | 2011-04-06 |
EP2306405A3 EP2306405A3 (en) | 2015-03-11 |
EP2306405B1 true EP2306405B1 (en) | 2019-05-22 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10177787.8A Active EP2306405B1 (en) | 2009-09-25 | 2010-09-21 | Tachograph assembly for a vehicle and sensor assembly for a tachograph |
Country Status (2)
Country | Link |
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EP (1) | EP2306405B1 (en) |
DE (1) | DE102009042799A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013219796A1 (en) * | 2013-09-30 | 2015-04-16 | Continental Automotive Gmbh | Pulse generator for a device for operating data acquisition, gear arrangement with a pulse generator, tachograph arrangement and method for generating an output signal for a device for operating data acquisition in a vehicle |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007046942A1 (en) * | 2007-09-28 | 2009-04-16 | Continental Automotive Gmbh | Pulse generator for a device, in particular for a tachograph, and method for operating the pulse generator |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4326831A1 (en) | 1993-08-10 | 1995-02-16 | Georg Dipl Ing Voetterl | Tachographs for motor vehicles |
DE19610161C2 (en) | 1996-03-15 | 1998-01-22 | Mannesmann Vdo Ag | Data transmission device in a vehicle, consisting of a pulse generator and a control device, and pulse generator for the control device |
FR2757663B1 (en) * | 1996-12-24 | 1999-12-10 | Ricard Claude | METHOD AND DEVICE FOR AVOIDING FRAUD ON A TAXIMETER OR CHRONOTACHYGRAPH |
DE102006036066A1 (en) | 2005-09-22 | 2007-04-05 | Continental Teves Ag & Co. Ohg | Control device e.g. tachograph, for motor vehicle, has encoded connection additional to encoder such that device has plausibility check routine, and information is found with data and is verified and calibrated by processing data of encoder |
DE102006040297B4 (en) | 2006-08-29 | 2010-12-09 | Continental Automotive Gmbh | Speed detection for a tachograph system |
-
2009
- 2009-09-25 DE DE102009042799A patent/DE102009042799A1/en not_active Ceased
-
2010
- 2010-09-21 EP EP10177787.8A patent/EP2306405B1/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007046942A1 (en) * | 2007-09-28 | 2009-04-16 | Continental Automotive Gmbh | Pulse generator for a device, in particular for a tachograph, and method for operating the pulse generator |
Also Published As
Publication number | Publication date |
---|---|
EP2306405A3 (en) | 2015-03-11 |
DE102009042799A1 (en) | 2011-03-31 |
EP2306405A2 (en) | 2011-04-06 |
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