Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1997-03-11
1998-07-14
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
34082554, 340928, 340572, 34082531, 235384, 342 51, 342 42, G08B 2600, H04Q 700
Patent
active
057811067
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to the telecontrol of objects, and especially the telecontrol of the movement of automotive vehicles, for the purposes of producing an effective deterrent against theft and/or of allowing "transactions".
A transaction is understood to mean any type of collecting or dispatching of data with the aim of respectively receiving particulars originating from the interrogated object or of sending information to said object. This could involve, especially, checking the level of a battery, validating the toll for a car park or motorway, identifying an object, replacing a code stored in a rewritable memory, controlling the triggering of an alarm.
Various means are already known which are used as deterrent against the theft of automobiles. One of them consists in remotely reading one or more marks which are, carried by the vehicle and which are able to identify it.
Such devices comprise an interrogator unit capable of effecting a primary interrogation using waves so as selectively to interrogate at least one primary receiver/transmitter cell housed in or on said object and containing in primary storage means a first code, and of receiving from said primary cell a primary response able to represent a part at least of this first code.
A device of this type is known especially through French Patent No. 89 17133 (FR-A-2 656449), which describes a method for the control of the movement of objects, as well as the associated device. This device comprises at least one compulsory transitway equipped with a fixed transmitter/receiver reader forming an interrogator unit, connected to a station and at least one receiver/transmitter cell housed in or on the vehicle
When a vehicle passes through the transitway above the interrogator unit, this prompts the transmission of an identification code common to all the cells installed in the vehicle. This identification code is received by the cell, which then compares it with the identification code which it contains in a memory of electrically programmable type. If the two codes are identical, the cell transmits toward the interrogator unit a signal dependent on its own identification code which is contained in a read only memory. The signal transmitted by the cell is then received by the interrogator unit, which forwards it to processing means which deduce the identification code of the vehicle therefrom, which they are then going to compare with the codes of the equipped vehicles, which are contained in files.
Such a solution offers good protection against frauds of mechanical type (destruction or shielding of the cell) when the cell is installed in an invisible manner in the vehicle.
However, this known solution does not make it possible to protect against certain electronic frauds since: modified, given that they are contained in the read only memory of a cell to which access is made difficult, or even impossible, through its installation; common to all the cells and that the codes individual to each cell are contained in a file, anybody having had access at a given instant to said file is in a position to make and install a replacement decoy on a given vehicle; consisting in obtaining the code individual to each cell, this precluding any transaction other than that of identification.
Moreover, the interrogator unit being fixed, such a solution does not make it possible to effect an identification just anywhere.
SUMMARY OF THE INVENTION
The present invention proposes a means of multiple transaction, and especially of anti-theft deterrent suitable for remedying the aforesaid drawbacks.
For this purpose it proposes a device of the type described earlier and furthermore comprising at least one secondary receiver/transmitter cell housed in or on said object and containing in secondary storage means a second code and a first representation of a part at least of the first code, and capable of transmitting, in response to a secondary interrogation, a secondary response able to represent a part at least of this second code, as well as of
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patent: 5196846 (1993-03-01), Brockelsby et al.
patent: 5351052 (1994-09-01), D'Hont et al.
patent: 5552789 (1996-09-01), Schuermann
patent: 5565857 (1996-10-01), Lee
Crosland Donnie L.
Inmed B.V.
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