EP0854443A1 - Verfahren und Vorrichtung zum Vermeiden von Betrügereien an einem Taximeter oder einem Fahrtenschreiber - Google Patents

Verfahren und Vorrichtung zum Vermeiden von Betrügereien an einem Taximeter oder einem Fahrtenschreiber Download PDF

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Publication number
EP0854443A1
EP0854443A1 EP97420229A EP97420229A EP0854443A1 EP 0854443 A1 EP0854443 A1 EP 0854443A1 EP 97420229 A EP97420229 A EP 97420229A EP 97420229 A EP97420229 A EP 97420229A EP 0854443 A1 EP0854443 A1 EP 0854443A1
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EP
European Patent Office
Prior art keywords
speed
information
sensor
vehicle
taximeter
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EP97420229A
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English (en)
French (fr)
Inventor
Claude Ricard
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Individual
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Individual
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Publication of EP0854443A1 publication Critical patent/EP0854443A1/de
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B13/00—Taximeters
    • G07B13/02—Details; Accessories
    • 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
    • G07C7/00—Details or accessories common to the registering or indicating apparatus of groups G07C3/00 and G07C5/00

Definitions

  • the present invention relates to a method, and to a device, for avoid fraud on a taximeter or on a tachograph.
  • a taximeter is, very generally, a device which has for its object indicate the price to be paid for a taxi trip, this price depending several parameters, including the distance traveled by the taxi, i.e. finally the number of wheel turns performed by this vehicle during the race.
  • the sensor used to measure this number of wheel turns is then the sensor normally associated with the vehicle dashboard and therefore connected the speedometer which indicates both the instantaneous speed of this vehicle and the mileage covered by it.
  • Modern vehicles are almost all equipped with a sensor electromagnetic or electronic of the number of wheel revolutions, called “sensor electronic”, which is provided at the gearbox, and which is equipped an output connector to which a cable is connected which collects and conveys the electrical impulses representative of the number of wheel turns to the speedometer fitted to the dashboard.
  • the dashboard is then conventionally equipped with an auxiliary output, which is electrically connected in parallel on this cable, and to which we just plug the input corresponding of the taximeter: the pulses which are conveyed on this cable They therefore simultaneously supply the vehicle speedometer and the taximeter.
  • a small auxiliary pulse generator whose frequency is controlled by that of pulses from the sensor and which consequently delivers pulses whose frequency differs, in a defined ratio which is for example of the order of 1.2, from that of the pulses delivered by this sensor.
  • the frequency of the pulses applied to it is then chosen 1.2 times greater than that pulses delivered by the sensor, so that everything happens as if the taxi was traveling at a speed 1.2 times faster than its real speed, which affects the displayed price which is then 1.2 times higher than the price that the customer should actually pay.
  • the device of the fraudster is then set to deliver frequency pulses 1.2 times lower than that of the sensor pulses and, for the tachograph, everything is goes as if the truck was traveling at a speed 1.2 times slower than its speed real.
  • the invention therefore aims to prohibit any fraud based on a falsification of the speed information which is delivered to the taximeter or to the tachograph.
  • this anti-fraud action consists in displaying a particular information and / or to prohibit the operation of the taximeter or tachograph.
  • this process is characterized in that the anti-fraud test during which we verify at least at times that there is a relation between said vehicle speed and this information, is carried out several times at over a relatively long period of time compared to that of a single test, and in what we finally trigger this anti-fraud action if this relationship disappears at least for a predefined time over this period of time.
  • this anti-fraud test is carried out several times during a predefined and relatively long period of time compared to that of a single test, and in that we finally trigger this anti-fraud action only if, after this relatively long period of time, the number of tests that find fraud is greater than a predefined percentage of the total number of tests performed during this amount of time.
  • the information captured varying with the motor speed is the noise of the motor and the sensor of this last information is a microphonic element.
  • the information collected associated with the motor speed is an electrical signal whose frequency is proportional to the motor rotation speed.
  • a signal existing on the vehicle and whose frequency is proportional to the speed engine rotation such as an ignition signal or a speed signal used by vehicle electronics.
  • the two quantities are then proportional to the vehicle speed and the engine rotation speed and, for the same gear ratio, their ratio is constant.
  • the invention also relates to a device for implementing this process, the taximeter or tachograph being equipped with at least one unit calculation and command logic that receives and processes information from speed from the tachometer sensor, characterized in that it comprises additionally a microphonic engine noise sensor, this microphonic sensor being connected to a selective bandpass filter.
  • this filter is calibrated once for all on a frequency which corresponds to a motor rhythm, for example 3500 RPM approximately, which is found for all gearbox reports successive, and it is only when the rhythm of the motor passes by this frequency there that the microprocessor of the taximeter or tachograph performs a comparison between the speed of the vehicle which it then calculates according to the ratio of the gearbox currently engaged and the speed it deduces from the tachometer sensor information.
  • said logical unit has memory factors multiplication which are each characteristic of a determined ratio of the box of speeds, so that it calculates said real speed given by the sensor microphone according to each gear ratio, and does not then considers the test thus carried out as being a test which does not detect any fraud only if one of these real speeds, corresponding to the various reports of box, results in said concordance information.
  • the said unit is determined and stored logic, several factors each related to a specific ratio of the box speeds, for the calculation by the logical unit of said real speed, by making drive the vehicle successively with the different ratios of the gearbox speeds and by determining each time the multiplication factor which allows to obtain said agreement of the two vehicle speed measurements.
  • the reference 1 designates the sensor tachometer which is mounted on the vehicle to operate the taximeter 2.
  • a so-called "electronic" tachometer sensor of a motor vehicle is a transducer that tests a rotating mechanical part of the vehicle, the speed of rotation of this mechanical member being representative of the number of wheel turns carried out by the vehicle, and the generally alternating electrical signal supplied by this transducer corresponding to electrical pulses representative of this number of wheel turns.
  • this rotary mechanical organ is the more often one of the gears of the gearbox.
  • vehicles nowadays are more and more often provided with a system of braking says “A.B.S. which uses an electronic sensor for each wheel of the vehicle, and we then use one of these sensors to also operate the taximeter.
  • these vehicles are equipped with disc brakes on the four wheels, and therefore each electronic sensor is a proximity which comes to test the presence of notches which are practiced for this purpose on the outer edge of the brake disc.
  • the sensor 1 which is therefore in practice placed either at the level of the box either at one of the vehicle's wheels, therefore delivers on its terminals output 3, 4 of the pulses representative of the number of wheel turns performed by the vehicle.
  • the pulses from sensor 1 are first of all applied to a separation and adaptation amplifier 9, the output signals are applied to one of the inputs 10 of a microprocessor 11 which constitutes the central logical unit, or "C.P.U. ", From this taximeter.
  • the microprocessor 11 receives, by pressures exerted on 12-15 pushbuttons placed on the front side of the taximeter, signals which are for example either price or operation of the taximeter, either setting signals from the taximeter, or code signals.
  • the microprocessor 11 when the microprocessor 11 receives pulses coming from sensor 1 on its input 10, it emits in response, on an output 16, pulses whose frequency is representative, taking into account the parameters previously introduced into the microprocessor 11 by the keyboard 12-15, the number of wheel revolutions performed, since the last start-up of the taximeter by means of the keyboard 12-15, by the vehicle.
  • pulses are applied, as they should, to circuit 18 of counting and display of the price to pay.
  • a possible fraud consists in connecting in series on the line output speed sensor 1, for example between terminals 3, 4 and terminals 19, 20 bypassing connections 5 and 6, a pulse generator controlled which multiplies the rhythm of incoming pulses by a factor determined (manually adjustable if necessary), for example a factor 1, 2.
  • this anti-fraud action consists of displaying, for example on the front of the taximeter or tachograph, specific information, for example "Err", and / or to prohibit the operation of the taximeter or the tachograph.
  • a pellet microphone 26 is stuck on the engine 27 of the vehicle or on one of the elements of its exhaust system.
  • This tablet 26 is for example a tablet piezoelectric, ceramic, or electrostatic microphone.
  • this pad is a shock sensor, for example of the piezo-ceramic type.
  • the vehicle engine is an internal combustion engine, or essence, and to a lesser extent but in a detectable way, if this engine is a combustion engine, or diesel engine, a noise peak will be emitted by this motor at each impulse communicated to a cylinder by an explosion or combustion of the mixture. Depending on the speed of the motor itself, the pad 26 will therefore generate a series of electrical pulses.
  • the microphone or shock detector 26 will detect, in addition repetitive shocks due to explosions of the mixture, a host of other noises repetitive occurring at other repetition frequencies.
  • a filter digital 33 which is a bandpass filter, with steep sides, for example of order 4 at 7, whose bandwidth at 3 dB is for example of the order of 20% compared to its central setting frequency, that is to say corresponds substantially, in percentage with respect to this center frequency, to a percentage of tolerance ⁇ 10%.
  • the microprocessor 11 receives, on its input 10, the pulses in from the tachometer sensor. It measures their period, deduces their frequency, and applies that frequency, after multiplying it by a factor of correction which is characteristic of one of the gearbox reports, on the control input 34 of the bandpass filter 33, thereby imposing this frequency corrected as central setting frequency.
  • the filter bandpass 33 will only select, to the percentage due to its bandwidth, that, if it exists, the frequency line which corresponds to this central frequency of wedging.
  • the output 35 of the filter 33 is applied to a Analog to Digital Converter 36, whose digital output 37 is applied to microprocessor 11.
  • the latter deduces the amplitude of the signal in output of filter 35, and, if this amplitude is greater than a determined threshold, it validates the information. Otherwise, the microprocessor multiplies the pulse frequency of the tachometer sensor by a representative factor from another gearbox report, and reapply the result on connection 34, as a new setting frequency, and so on until you have tried all the factors respectively representative of each of the reports of this gearbox. If then no signal at output 35 of filter 33 has been validated is that there is a presumption of fraud, and the microprocessor consequently records this test as negative and therefore possibly characteristic of fraud, and therefore as falsification information.
  • the above factors are stored, upon installation and route of the taximeter or tachograph by an approved installer, in the microprocessor 11 to which it is connected by the bidirectional link 32, making drive the vehicle successively with the different ratios of the gearbox speeds and by determining each time the multiplication factor which corresponds to the concordant detection of a frequency line.
  • the driver may in certain case decide to drive in freewheeling, therefore in neutral, for a good time more than a few minutes, which would lead to an unfortunate blocking command.
  • the invention provides, generally and whatever the implementation device used, to carry out a test anti-fraud - performed as described above - a large number of times during a predefined and relatively long period of time compared to that of a single test. For example, if each test lasts five minutes, this test is performed every five minutes and for a period of time that can range from several hours to example a day. We can also typically perform these successive tests on a time of one day and half a day, all this being done under microprocessor control 11.
  • the microprocessor checks if the number of tests concluding that a fraud is greater than a determined percentage, by example of the order of 5%, of the total number of tests carried out during this period of time. If so, it issues a tampering signal that blocks the taximeter or tachograph. If not, no falsification signal is issued.
  • the time span is one day, and the driver is therefore allowed to coast for approximately one hour without blocking his taximeter or tachograph.
  • the microprocessor 11 does not take into account the falsification pulses which it then receives on its input 32.
  • link 34 does not exist (or is not activated if it exists), and the filter 33 is not a controlled filter, or at least at its fixed setting frequency once for all.
  • the bandpass filter 33 is calibrated on a central frequency which corresponds to a usual engine speed, typically around 3,500 rpm for example, which is found when the vehicle drives normally, in each of the different reports in its gearbox speeds. We then compare the speed of the vehicle, at this time where the speed motor goes to this stall frequency, that the microprocessor 11 of the taximeter or tachograph calculates according to the gearbox ratio then engaged, at that provided by the tachometer sensor, and the anti-fraud action is triggered above if these two speed measurements do not match, under the conditions of sufficient tolerance and repetition of the test that have been defined above.
  • a usual engine speed typically around 3,500 rpm for example
  • the filter 33 is set once and for all on a frequency which corresponds to a usual motor rhythm, for example of 3,500 RPM approximately, which is found for all gearbox reports successive, and it is only when the rhythm of the motor passes by this frequency there that the microprocessor 11 of the taximeter or tachograph performs a comparison between the speed of the vehicle which it then calculates according to the ratio of the gearbox currently engaged and the speed it deduces from the tachometer sensor information 1.
  • the information sensed associated with the engine speed is an electrical signal whose frequency is proportional to the engine speed.
  • a signal existing on the vehicle and whose frequency is proportional to the engine speed such as an ignition signal or a speed signal used by the vehicle electronics.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)
EP97420229A 1996-12-24 1997-12-10 Verfahren und Vorrichtung zum Vermeiden von Betrügereien an einem Taximeter oder einem Fahrtenschreiber Withdrawn EP0854443A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9616233A FR2757663B1 (fr) 1996-12-24 1996-12-24 Procede et dispositif pour eviter les fraudes sur un taximetre ou chronotachygraphe
FR9616233 1996-12-24

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EP0854443A1 true EP0854443A1 (de) 1998-07-22

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EP97420229A Withdrawn EP0854443A1 (de) 1996-12-24 1997-12-10 Verfahren und Vorrichtung zum Vermeiden von Betrügereien an einem Taximeter oder einem Fahrtenschreiber

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EP (1) EP0854443A1 (de)
FR (1) FR2757663B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2155000A1 (es) * 1998-12-23 2001-04-16 Univ Madrid Carlos Iii Teletacometro acustico robusto, automatico, en tiempo real, de maxima resolucion y universal para motores de explosion.
EP2302398A1 (de) * 2009-09-25 2011-03-30 Continental Automotive GmbH Tachographenanordnung für ein Fahrzeug und Sensoranordnung für einen Tachographen
EP2306405A3 (de) * 2009-09-25 2015-03-11 Continental Automotive GmbH Tachographenanordnung für ein Fahrzeug und Sensoranordnung für einen Tachographen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2792092B1 (fr) 1999-04-06 2001-06-08 Claude Ricard Procede pour penaliser les tentatives de fraude sur un taximetre

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217484A (en) * 1977-02-07 1980-08-12 Gerst William J Taximeter
WO1980002207A1 (en) * 1979-04-11 1980-10-16 G Schmidt Electronic taximeter
US4452079A (en) * 1982-09-27 1984-06-05 Cooper Industries, Inc. Acoustic tachometer
GB2162323A (en) * 1984-07-24 1986-01-29 Diesel Kiki Co Measuring speed of a vehicle
DE3920385A1 (de) * 1989-06-22 1991-01-03 Preh Elektro Feinmechanik Verfahren zum kontrollieren einer nutzungsgroesse eines kraftfahrzeugs
DE4311686A1 (de) * 1992-04-13 1993-10-14 Nippon Denso Co Dopplereffekt- Fahrgeschwindigkeitsmeßeinrichtung
WO1994006100A1 (de) * 1992-09-07 1994-03-17 STAEHELI, Nicolas Verfahren und vorrichtung zum bestimmen, registrieren und fallweisen auswerten von betriebs- und/oder fahrdaten eines fahrzeuges
DE4431720C1 (de) * 1994-09-06 1996-02-29 Sun Electric Deutschland Gmbh Verfahren und Vorrichtung zur Bestimmung der Drehzahl von Verbrennungskraftmaschinen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217484A (en) * 1977-02-07 1980-08-12 Gerst William J Taximeter
WO1980002207A1 (en) * 1979-04-11 1980-10-16 G Schmidt Electronic taximeter
US4452079A (en) * 1982-09-27 1984-06-05 Cooper Industries, Inc. Acoustic tachometer
GB2162323A (en) * 1984-07-24 1986-01-29 Diesel Kiki Co Measuring speed of a vehicle
DE3920385A1 (de) * 1989-06-22 1991-01-03 Preh Elektro Feinmechanik Verfahren zum kontrollieren einer nutzungsgroesse eines kraftfahrzeugs
DE4311686A1 (de) * 1992-04-13 1993-10-14 Nippon Denso Co Dopplereffekt- Fahrgeschwindigkeitsmeßeinrichtung
WO1994006100A1 (de) * 1992-09-07 1994-03-17 STAEHELI, Nicolas Verfahren und vorrichtung zum bestimmen, registrieren und fallweisen auswerten von betriebs- und/oder fahrdaten eines fahrzeuges
DE4431720C1 (de) * 1994-09-06 1996-02-29 Sun Electric Deutschland Gmbh Verfahren und Vorrichtung zur Bestimmung der Drehzahl von Verbrennungskraftmaschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2155000A1 (es) * 1998-12-23 2001-04-16 Univ Madrid Carlos Iii Teletacometro acustico robusto, automatico, en tiempo real, de maxima resolucion y universal para motores de explosion.
EP2302398A1 (de) * 2009-09-25 2011-03-30 Continental Automotive GmbH Tachographenanordnung für ein Fahrzeug und Sensoranordnung für einen Tachographen
EP2306405A3 (de) * 2009-09-25 2015-03-11 Continental Automotive GmbH Tachographenanordnung für ein Fahrzeug und Sensoranordnung für einen Tachographen

Also Published As

Publication number Publication date
FR2757663A1 (fr) 1998-06-26
FR2757663B1 (fr) 1999-12-10

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