Process and device for avoiding fraud on a taxi equipped with a taximeter or on a truck equipped with a chronotachograph
First Claim
1. A process for preventing fraud in a vehicle equipped with one of a taximeter and chronotachograph, said vehicle being equipped with at least one electronic sensor which is used at least for supplying a signal to said one of said taximeter and chronotachograph, comprising the steps of:
- monitoring, in parallel, two electric signal output wires of said sensor; and
triggering an electronic anti-fraud action, including at least modifying electronic data normally transmitted to said one of said taximeter and chronotachograph, if, during said monitoring step, at least one of (a) an internal characteristic of an active dipole then present between said two wires and (b) a characteristic of said electric signal available between said two wires during normal displacement of said vehicle, has been modified with respect to reference values.
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Accused Products
Abstract
An electronic device, placed in an impregnable envelope and electrically connected between an electronic sensor and a taximeter or chronotachograph, tests at least one of the internal characteristics of the active dipole present between two output wires of the sensor or electrical characteristics of a signal present at its terminals. The test values are then compared with one or several reference values. An electronic anti-fraud action is triggered in the event of non-conformity between the test values and the reference values. One anti-fraud action includes preventing the functioning of the taximeter or chronotachograph.
16 Citations
21 Claims
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1. A process for preventing fraud in a vehicle equipped with one of a taximeter and chronotachograph, said vehicle being equipped with at least one electronic sensor which is used at least for supplying a signal to said one of said taximeter and chronotachograph, comprising the steps of:
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monitoring, in parallel, two electric signal output wires of said sensor; and triggering an electronic anti-fraud action, including at least modifying electronic data normally transmitted to said one of said taximeter and chronotachograph, if, during said monitoring step, at least one of (a) an internal characteristic of an active dipole then present between said two wires and (b) a characteristic of said electric signal available between said two wires during normal displacement of said vehicle, has been modified with respect to reference values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An anti-fraud device for a vehicle equipped with a taximeter or chronotachograph, comprising:
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memorizing means for memorizing reference values representing at least one of signal levels and internal characteristics of an active dipole present between two wires of a sensor for sensing the rotation of a wheel, said memorizing means connected in parallel with said sensor; comparing means for comparing at least one of real-time sensor signal values and internal characteristics of said active dipole with memorized reference values memorized in said memorizing means and for outputting a trigger signal when said at least one of said real-time sensor signal values and internal characteristics vary from said memorized reference values, said comparing means also connected in parallel with said sensor; anti fraud means, connected to said memorizing and comparing means and responsive to said trigger signal, for at least modifying electronic data normally transmitted to said taximeter or chronotachograph; and a mechanically impregnable envelope surrounding said memorizing, comparing and anti-fraud means. - View Dependent Claims (18, 19, 20, 21)
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Specification