FR2846123A1 - Device embedded in roadway to monitor vehicle speed and signal passing vehicles, particularly when they are exceeding the speed limit, uses vibration sensing strips set across roadway as input to electronic unit that measures speed - Google Patents

Abstract

The speed detection system uses a group of strips placed on the road surface or embedded in the surface to detect passage of a vehicle. Vibration detectors are particularly suitable. The detectors are connected to an electronic device that emits a coded signal representing vehicle speed. The speed can be displayed or sent to a receiver in the vehicle which can activate an alarm.

Description

- 1 The present invention relates to a device for controlling and

save the

automobile speed.

  Current speed control methods are mainly carried out at

  helps you with easily detectable electronic wave generators.

  The device according to the invention consists of a set of strips positioned on the surface or inside a track. These bands represent coded information, read by a sensor and intended for a processing unit placed in a

  vehicle. An external box allows data visualization.

  By varying the spacing and the number of bands on a track we create a set of words. These words are read as the vehicle passes. The nature and the positioning of the strips determine the type of sensor retained for reading the

  information. These strips are placed across the track and can cover all or part of it. By way of nonlimiting example, the bands can be represented by paint lines associated with an optical sensor or by thin bands fixed on the road surface associated with a vibration sensor.

  In annex Figure 1 shows the arrangement of the bands on the track.

  According to a variant not illustrated, the bands can also be fixed at an angle

relative to the track.

  An internal box placed in the vehicle receives information from a sensor, the type of which depends on the nature of the strips. This sensor, external or internal to the box, sends pulses corresponding to the diagrams of the bands. This data flow is transmitted to an asynchronous input port and converted into parallel data using a serial to parallel converter. A microprocessor is responsible for: - Recognizing the data thanks to a correspondence table saved in a ROM type memory. This will also contain the programs; - To date the information thanks to an internal clock;

  - And save the information in a RAM memory.

  3 Depending on the nature of the information, it can order an output port to

  transmit information to the external environment. By way of nonlimiting example for the activation of an alarm if the given corresponds to a prohibited direction. A transceiver allows on interrogation to transmit the information contained in the RAM to an external box. The box will be powered by the vehicle battery and an internal accumulator will save the 40 memories in the event of a main power failure.

  In the appendix, FIG. 2 represents the architecture of the internal box.

  The external box also equipped with a transceiver will read 45 of the data contained in the RAM of the internal box. A microprocessor will perform the various calculations related to the movement of the vehicle. Depending on the nature of the results, he may order an output port to transmit

  information to the external environment.

  -2 RAM is required for temporary storage of data and an EEPROM will contain the programs. The results will also be displayed on 5 screens or printed on paper. The box can also transmit information to the internal box. It can be portable and powered by battery or fixed and

  positioned on the passage of vehicles.

  In the appendix, FIG. 3 represents the architecture of the external box.

  According to a particular embodiment of a system based on the vibratory mode and intended to control the speed of an automobile passing through an agglomeration, thin strips are available on the roadway, the material of which is not important. The passage of the car will create a vibration detected by a sensor

vibration integrated into the housing.

  Firstly, and by way of nonlimiting example, there is a first strip across the track, then a second 20 centimeters from the first and a third 40 centimeters from the second to communicate the word 1101 to the box. internal. This word can allow recognition of the device and indicates the start of the zone. In order to recognize the authorized speed, the following bands are arranged according to one of the words in Table 1; 0011-> 30 km / h 0111-> 70 km / h 1011-> 110km / h -> 40 km / h 1000-> 80 km / h 1100-> 120km / h 0101-> 50 km / h 1001-> 90 km / h 1101-> 130 km / h 0110-> 60 km / h 1010-> 100 km / h Table 1: correspondence of words with speeds Finally with three bands (1101) as an end indicator, the word is generated

  according to 110101011101, for a total of 8 bands on the track.

  In a second step and by way of nonlimiting example, there are, at a planned interval (for example 50 or 100 meters) for a given speed, strips according to

Figure 1101.

  And finally we generate a word (for example 110111101) to indicate

the end of the zone.

  Thus all along the course the microprocessor can calculate the average speed 40 and memorize it.

  The device according to the invention is particularly intended to signal the

  exceedances of the authorized speeds and allows the control of the speeds achieved.

-3

Claims (10)

  1) Device made up of a set of bands intended to communicate an indication, when they cross a sensor, to an internal box   placed inside a motor vehicle.   2) Device according to claim 1 characterized in that the arrangement of the 10 bands with respect to each other represents coded information.   3) Device according to any one of the preceding claims, characterized in that the strips are arranged perpendicularly or in bias relative to the track.   4) Device according to any one of the preceding claims, characterized in that the strips can cover all or part of the way.   5) Device according to any one of the preceding claims   characterized in that the tapes communicate original information   vibration to the sensor associated with the internal box.   6) Device according to claims 1 to 4 characterized in that the bands 25 communicate information read by an optical sensor associated with the housing internal.   7) Device according to any one of the preceding claims, characterized in that the internal box makes it possible to communicate traffic information to an external box.   8) Device according to claims 1 to 6 characterized in that the housing   internal to date the traffic information.   9) Device according to claims 1 to 6 characterized in that the housing   internal memory allows traffic information to be stored in memory.   ) Device according to claims 1 to 6 characterized in that the housing   internal can also activate alarms. 40 11) Device according to claim 7 characterized in that the external housing   can communicate information to the internal box.   12) Device according to claim 7 characterized in that the external housing 45 can communicate information to the external environment.