JPH0535995A - On-vehicle device for identifying mobile object - Google Patents

Abstract

(57) [Summary] [Purpose] In an on-vehicle device for identifying a mobile object, an individual identification number stored in the storage device is prevented from disappearing even when power supply is stopped. A modulator 5 that receives a carrier wave from a ground apparatus and modulates the carrier wave in a moving body identification on-board device
A demodulator 4 for demodulating a rewrite signal sent from a ground device, a storage device 2 composed of a rewritable nonvolatile memory for storing an individual identification number, and a control for controlling transmission and rewriting of an individual identification number It has a device 3 and a power supply 1 for each of these parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile body identification system and, more particularly, to a mobile body identification on-board device for sending an individual identification number attached to a mobile body to a ground device.

[0002]

2. Description of the Related Art Conventionally, for example, one of the methods of managing a large number of automobiles is a mobile body identification system for grasping the traveling position of each automobile.

This has an on-board device installed in a mobile vehicle or the like and a ground device fixed on the ground. The individual identification number of itself stored in the on-board device, for example, a quasi-microwave is used. It is configured to be transmitted as a carrier wave to the terrestrial device. In that case, a dynamic RAM (DRAM) was used as the individual identification number in the on-vehicle device, and the power was supplied from the battery. Therefore, if the battery has a constant power supply, it is possible to transmit the individual identification number to the ground device or to rewrite and retain the memory, and the ground device can use the individual identification number transmitted from the onboard device. Can manage mobile cars.

[0004]

However, since the above-described conventional on-vehicle device uses the DRAM as the memory device and supplies the power for holding the memory from the battery, when the battery runs out of life or fails. However, there is a problem that the individual identification number stored in the DRAM is easily erased and not retained, and the identification number information is lost.

In view of the above, the present invention allows non-contact rewriting of the individual identification number, and does not lose the individual identification number even when the battery is exhausted and power is not supplied, and quick access is possible. An object of the present invention is to provide an on-vehicle device for identifying a moving body.

[0006]

According to the present invention, in a mobile identification system, a carrier for receiving a carrier from a terrestrial device, a modulator for modulating the carrier, and a rewriting signal for rewriting the sent individual identification number are demodulated. A demodulator, a storage device for storing an individual identification number composed of a rewritable non-volatile memory, a control device for controlling transmission or rewriting of the individual identification number, and a power supply for each of these parts. Characterize.

[0007]

According to the present invention, of course, when the battery power source is normal, the individual identification number can be transmitted or the memory can be rewritten with the ground device, and for some reason, such as battery life, Even if the power supply is disabled due to insufficient management, the non-volatile SRAM is used as the storage memory, so the stored individual identification number will not disappear.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention, in which 1 is a power source such as a battery, 2 is a storage device for storing an individual identification number, and a rewritable non-volatile memory element is used. Memory, SRAM is used. 3 is a control device, 4
Is a demodulator, 5 is a modulator, 6 is a wireless processing unit, and 7 is an antenna.

When power is supplied from the power supply 1 to the storage device 2, the control device 3, and the demodulator 4, the control device 3 reads the individual identification number stored in the storage device 2, and the individual identification number is read. Thus, a carrier wave such as a quasi-microwave from the terrestrial device extracted via the antenna 7 and the wireless processing unit 6 is modulated and sent to the terrestrial device. Also, demodulator 4
Demodulates the rewriting signal of the individual identification number sent from the ground device received by the antenna 7, and the control device 3 newly rewrites the individual identification number stored in the storage device 2 according to the demodulated rewriting signal. ..

With the above configuration, when the power supply from the power supply 1 is not possible, the control device 3 does not operate, and therefore the individual identification number is not transmitted or rewritten, but the storage device 2
The stored contents are retained because the storage memory is a rewritable non-volatile memory or SRAM, and therefore the individual identification number is not lost.

FIG. 2 is a block diagram of the second embodiment of the present invention. Reference numeral 8 is a second storage device for storing an individual identification number, which is constituted by a RAM having a fast access time and other symbols. Uses the description of the reference numerals in FIG.

In the above configuration, the individual identification number is stored in both the storage device 2 and the storage device 8. However, during communication with the ground device, the individual identification number read out from the storage device 8 by the RAM having fast access is output. Then, after the communication is completed, the individual identification number of the storage device 2 is rewritten by the individual identification number stored in the storage device 8 if necessary. The feature of the second embodiment is that the individual identification device can be accessed from the storage device 8 having a short access time, so that the communication with the ground device can be performed at an extremely high speed.

[0014]

As described above, the onboard apparatus for moving body identification according to the present invention uses the rewritable non-volatile memory as the storage memory of the storage device. The individual identification number can be transmitted at high speed and the contactless rewriting can be performed at high speed, and the individual identification number is stored in the non-volatile memory even when the power supply is cut off, so it can be erased. Not have great effect.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a second embodiment of the present invention.

[Explanation of symbols]

1 ... Power supply, 2, 8 ... Storage device, 3 ... Control device, 4
... demodulator, 5 ... modulator, 6 ... wireless processing section, 7 ... antenna.

Claims (1)

Claim: What is claimed is: 1. An on-board device in a mobile body identification system, which receives a carrier wave from a ground device, rewrites a modulator for modulating the carrier wave, and rewrites an individual identification number sent. A demodulator for demodulating a signal, a storage device for storing an individual identification number composed of a rewritable nonvolatile memory, a control device for controlling transmission or rewriting of the individual identification number, and a power supply for each of these parts are provided. An on-vehicle device for identifying a moving object, which is characterized in that