JP2807100B2 - Transceiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission / reception apparatus used for remote control such as unlocking of a door of an automobile, and more particularly to a transmission / reception apparatus capable of dealing with theft.

[0002]

2. Description of the Related Art Some transmission / reception devices have a security function with a specific I / D code. One example is a transmission / reception device for remote control of an automobile. In this method, a vehicle user carries a transmitter, and transmits transmission data to which a unique I / D code is added from the transmitter to the vehicle. A receiver provided in a vehicle has a function of determining an I / D code, and executes a command included in transmission data when it is determined that the code is a unique I / D code. This execution includes, for example, automatic unlocking of a door of an automobile, automatic lighting of a vehicle interior light and a headlight, and the like.

[0003]

When a transmitting / receiving device using the above-mentioned specific I / D code is used, for example, there is a concern that the owner of the car may drop the transmitter or the transmitter may be stolen. Another person with a transmitter that has been picked up or stolen, for example, can transmit to a number of cars in a parking lot in order and find the car corresponding to that transmitter, and unlock the car door. And so on.

[0004] The present invention is to solve the above-mentioned conventional problems, and a transmission / reception apparatus in which a security function is improved by preventing a person from having a transmitter in a reception state. It is intended to provide.

[0005]

According to the transmission / reception apparatus of the present invention, a transmitter forms transmission data including an operation section, a fixed code, a variable code corresponding to the number of operations of the operation section, and transmission information. A data generation unit, a modulation unit that modulates the data, and a transmission unit that transmits the data are provided,
The receiver, a receiving unit that receives the transmission data transmitted from the transmitter, a demodulation unit that demodulates the received data,
A data decryption unit is provided, and the data decryption unit determines whether or not the data can be received from the fixed code and the variable code, and determines whether the data is a variable code and the number of receptions .
When the variable code corresponding to difference is characterized in that for updating fly combined variable code corresponding to the reception frequency on the basis of a predetermined operation at the transmitter variable code.

[0006]

In the above means, data including a variable code corresponding to the number of operations is transmitted from the transmitter, and the receiver matches the fixed code and corresponds to the variable code and the number of receptions.
The transmission data is accepted when the variable codes match.
So, for example, when someone transmits to the receiver after operating the transmitter several times, the variable code and the number of receptions
Since the corresponding variable codes do not match, the transmission data is not accepted. However, if the owner himself / herself erroneously operates the transmitter several times and then transmits the data toward the receiver, the number of receptions of the receiver is skipped and updated by a predetermined operation, and data reception is accepted. This predetermined operation is performed, for example, when the first transmission data is not received by the receiver.
The transmission is performed a predetermined number of times, for example, three times in succession, and this operation causes the receiver to receive the transmission data.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit block diagram showing a transmission / reception device according to the present invention, in which (A) shows the configuration of a transmitter and (B) shows the configuration of a receiver. This transmission / reception device is shown as an example for use in a remote control device for an automobile. As shown in FIG. 1A, the transmitter 1 has a key operation unit 11 and a data generation unit 12 that generates transmission data. In the data generation unit 12, as shown in FIG. 2, a unique I / D code (a), a variable code (b),
Serial transmission data in which the command data (c) is arranged is formed.

The unique I / D code (a) is shown in FIG.
Are stored in the I / D code memory 13 shown in FIG. This unique I / D code (a) can also be formed by mounting a diode at an arbitrary position on the matrix circuit. The variable code (b) is generated by the variable code adder 14. In the variable code adding unit 14, the number of times of operation of the key operation unit 11 is added, and "01""02"
Variable data of “03”... Is generated.

[0009] Further, the data generation section 12 is provided with the key operation section 1.
It has a function of storing command data (c) corresponding to the predetermined command information operated in 1 and a function of selecting the corresponding command data. Then, the data generation unit 12 generates serial transmission data shown in FIG. 2 in which a unique I / D code (a) and a variable code (b) are added before the selected predetermined command data (c). Is done. Data generation unit 1
A modulation section 15 and a transmission section 16 are provided at the next stage of the second section. The transmission data shown in FIG. 2 generated by the data generation unit 12 is subjected to FM modulation or the like by the modulation unit 15 and transmitted from the antenna 17 by the transmission unit 16.

The receiver 2 shown in FIG. 1B is provided with a receiving section 22 for receiving transmission data from an antenna 21 and a demodulation section 23 for demodulating the received data. In the next stage of the demodulation unit 23, a data decoding unit 24, a reception number adding unit 25, and an I / D code memory 26 are provided.

The I / D code memory 26 stores the same unique I / D code as that stored in the I / D code memory 13 of the transmitter 1. The I / D code memory 26 can also be configured by mounting a diode on a matrix circuit. In the number-of-times-of-reception adding unit 25, the data decoding unit 24 outputs the I / D code and I / D code of the received data.
When it is determined that the I / D code stored in the / D code memory 26 matches, the number of receptions is “01”.
"02", "03", etc. are added.

In the data decoding unit 24, the unique I / D code (a) shown in FIG.
Is compared with the I / D code stored in the I / D code memory 26, and the variable code (corresponding to the number of transmissions by the transmitter) (b) shown in FIG. The code is compared with the code of the added number of receptions. When the two codes match, this data is accepted, an operation corresponding to the command data (c) shown in FIG. 2 is recognized, and a predetermined drive command is issued to the drive unit 27. Drive unit 2
In 7, the doors of the automobile are unlocked, the interior lights are turned on, the headlights are turned on, etc. by a drive mechanism such as a solenoid, a motor, and a switch.

Next, when the transmission data is received, in the data decoding unit 24, the unique I / D code (a) matches, but the variable code (b) and the addition added to the reception number adding unit 25 are added. When it is determined that the codes do not match, data is accepted when it is determined that the same transmission data has been received a predetermined number of times, for example, three times in succession. The reception of the data at this time is performed by jumping up the number of additions of the number-of-receptions adding unit 25 in accordance with the variable code of the transmitter 1.

With reference to FIG. 3, a more detailed description will be given of the decoding of a code among the transmission / reception operations performed by the transmitter 1 and the receiver 2. I / D code memory 1 of transmitter 1
3 is changed to “123”.
33 ". When the transmission is performed for the first time, the variable code adding unit 14 operates the key operation unit 11 of the transmitter 1 to set “0”.
A variable code (b) of "1" is formed. Data generation unit 1
2, the unique I / D code (a) of the above “12333”
Next, a variable code (b) of “01” is added, and operation command data (c) is further added to form transmission data shown in FIG. 2 and transmitted from the antenna 17.

In the receiver 2, the transmission data is received by the receiver 22, demodulated by the demodulator 23, and sent to the data decoder 24. In this case, both the transmitted unique I / D code and the I / D code stored in the I / D code memory 26 match “12333”, and since this is the first reception, the reception frequency adding unit 25 An addition code of “01” is formed. Therefore, the data is accepted because the I / D codes match and the variable code (b) and the addition code of the number-of-times-of-reception adding unit 25 are both "01". Then, the command data (c) is decoded by the data decoding unit 24, and a predetermined drive command is issued to the drive unit 27.

Next, when the second transmission is performed from the receiver 1 to the transmitter 2, the variable code is added once by the variable code adder 14 of the transmitter 1, and the variable code becomes "02". When this data is received by the receiver 2, the data decoding unit 24
Since the codes match, the number-of-times-of-reception adding unit 25 adds one time to form an addition code of “02”. Therefore, at this time, since both the variable code (b) and the addition code match at “02”, the transmission data is accepted by the receiver 2.

Next, for example, when the transmitter reaches another person's hand,
Suppose that it was used seven times towards the receiver of another car.
After that, if transmission is performed toward the vehicle equipped with the receiver 2 corresponding to the transmitter 1, the variable code added by the variable code adding unit 14 at this time is "10". On the other hand, in the data decoding unit 24 of the receiver 2, the I / D
In order to determine that the codes match, the reception number adding unit 25 adds one time to form an addition code of “03”. Therefore, although the I / D codes match in the data decoding unit 24, the variable code “10” and the addition code “0”
Since "3" does not match, rejection of the data is rejected.

However, it is assumed that the tenth operation of the transmitter is the original owner. In this case, the same operation of the transmitter 1 is repeated three times continuously. At this time, in the data decoding unit 24 of the receiver 2, at the time of the first operation (the number of operations is the tenth operation), the transmitted variable code is “10” and the addition data in the reception number adding unit 25 is “03”. , Reject the reception. Then the same transmission (the number of operations is 1
When the (first time) is performed, the data decryption unit 24 also rejects the data reception, but the received variable data is "1".
1 ". However, the addition code at the reception count adding unit 25 at this time is “04”. If the same transmission is performed once more continuously (the number of operations is 1
Second), according to a command from the data decryption unit 24, the “1”
Based on the variable code of “1”, the number of additions of the number-of-times-of-reception adding unit 25 is jumped up to 12, thereby generating an addition code of “12”. Therefore, at this time, the data decoding unit 24
It is determined that the I / D codes match, and that the variable code and the addition code in the number-of-times-of-reception adding unit 25 both match at “12”, accepts the data, and issues a predetermined operation command to the driving unit 27. .

As shown in FIG. 3, when the transmitted variable code does not match the addition code in the number-of-receptions adding section 25, a condition for jumping up the addition code is inevitable. Do not operate continuously 3 times, 4
The operation may be performed continuously or more times. Alternatively, as a condition for jumping up the addition code, it is not always necessary to repeat the same transmission operation continuously.
For example, when transmission data is not accepted due to the tenth operation in FIG. 3, a predetermined operation, for example, by simultaneously operating a plurality of keys of the key operation unit 11 of the transmitter 1, the instruction data is transmitted. The data for jump-up may be added before (c), and when the data is received, the number of times of addition by the number-of-times-of-reception adding unit 25 may jump up to “11” in the eleventh operation.

Further, the transmission / reception device according to the present invention is not limited to a remote device for an automobile, but can be used for other devices requiring a security function, such as a remote control device for opening and closing a garage.

[0021]

According to the present invention described in detail above, if the transmitter is used by another person and operated at another place and then transmitted to the receiver, the transmission data is not accepted.
Security functions can be improved. In addition, in the case of the original user, the addition code can be jumped up by a predetermined operation, so that there is no problem in regular use.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a transmission / reception device according to the present invention, where (A) is a transmitter and (B) is a receiver.

FIG. 2 is an explanatory diagram showing a configuration of transmission data.

FIG. 3 is an explanatory diagram showing the relationship between the number of transmissions and the reception of data.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmitter 2 receiver 11 key operation unit 12 data generation unit 13 I / D code memory, 14 variable code addition unit 15 modulation unit 16 transmission unit 22 reception unit 23 demodulation unit 24 data decoding unit 25 reception count addition unit 26 I / D code memory 27 driver

Claims (1)

(57) [Claims] 1. A transmitter includes: an operation unit; a data generation unit that forms transmission data including a fixed code, a variable code corresponding to the number of operations of the operation unit, and transmission information; and a modulation unit that modulates the data. Unit, and a transmission unit that transmits data, the receiver includes a reception unit that receives transmission data transmitted from the transmitter, a demodulation unit that demodulates the reception data, and a data decoding unit. The data decoding unit is provided to determine whether or not the data can be received from the fixed code and the variable code . If the variable code is different from the variable code corresponding to the number of receptions, the transmitter Corresponding to this number of receptions based on the predetermined operation in
Transceiver characterized in that to jump updated according to the variable codes in the variable code.