JPH09125769A - Receiving device and remote control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the receiving of the key code information, which is transmitted from plural electronic keys (transmitting devices) having a different transmission format, so as to commonly use a receiver. SOLUTION: The key code information, which is transmitted from electronic keys, are received by a receiver circuit 53, and all bit number (X bit, Y bit) of the key code information is counted by a bit counter 54 so as to discriminate a transmission format on the basis of the all bit number. The key code information, which is decoded by a code decoding unit 55, is transmitted to a code discrimination and coincidence circuit 33 or 47 corresponding to the discriminated transmission format, and the key code information is collated with the transmission format fitted thereto.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a receiver and a remote control system. For example, it is for remotely controlling a vehicle door lock, engine start, and the like.

[0002]

2. Description of the Related Art There is a keyless entry device which controls the opening and closing of a door lock of a vehicle such as an automobile using infrared rays or radio waves by remote control from an electronic key. Figure 1 shows the keyless
The structure of an entry device is shown, and comprises an electronic key (transmission device) 21 and a door lock device 22 mounted on a vehicle.

The door lock device 22 further includes the receiving device 2.
4, a door lock opening / closing control controller 25, and a door lock 26.

When the key switch 23 is depressed, the electronic key 21 transmits the key code information to the door lock device 22 mounted on the vehicle. In the door lock device 22, the receiving device 2
If the key code information is received in step 4 and it is determined that the received key code information matches the key code unique to the vehicle,
A control signal is sent to the door lock open / close control controller 25 to open / close the door lock 26.

The functional block diagrams of the electronic key 21 and the receiving device 24 are shown in detail in FIGS. Electronic key 21
2A, as shown in FIG. 2A, the key switch 23, the control circuit 27, the key code storage unit 28, and the output circuit 29.
It is composed of

A key code (unique fixed code) 31 having a predetermined number of bits (total number of bits = X bits) as shown in FIG. 5 is registered in the key code storage unit 28, and the control circuit 27 controls the key. The key code 31 is read from the code storage unit 28 and sent to the output circuit 29. In the output circuit 29, the key code 31 is amplified, D / A converted, modulated,
The key code 31 is transmitted from the transmitting antenna 30.

The receiving device 24 is composed of a receiving circuit 32, a code matching determination circuit 33, a key code storage section 34, and an output circuit 35. The key code storage section 34 includes:
The same key code 31 as the key code storage unit 28 of the corresponding electronic key 21 is registered.

When the receiving device 24 receives the key code 31 from the receiving antenna 36, the receiving circuit 32 amplifies, demodulates,
/ D conversion is performed to restore the key code 31. The code matching determination circuit 33 includes the restored key code 31 and the key code storage unit 3
The output circuit 35 sends the door lock control signal to the door lock opening / closing control controller 25 by comparing with the key code 31 stored in FIG.
Send a signal to

However, recently, since the number of devices that can be operated by a remote controller is increasing and each device requires a dedicated remote controller, it is troublesome, and therefore, a plurality of devices (for example, air conditioner, TV, CD player, etc.) are provided. A general-purpose remote control that can be operated with this remote control is sold. Some of these general-purpose remote controls have a copy function. When the dedicated remote controller and the general-purpose remote controller face each other and send a signal from the dedicated remote controller, the signal of the dedicated remote controller is copied to the general-purpose remote controller, and the copy is performed using the general-purpose remote controller. There is one that can send the signal of the dedicated remote controller. If the key code information transmitted by the electronic key 21 is inadvertently copied using such a general-purpose remote controller, the vehicle may be stolen. Further, in the case of radio waves, when the key code information is transmitted from the electronic key 21 to the receiving device 24, the key code information may be intercepted and the key code 31 may be deciphered, and the vehicle may be stolen. .

In order to solve this problem, there has been proposed a variable code type keyless entry device in which a variable code 41 such as a rolling bit is added to the key code 31. FIG. 6 shows the configuration of the variable code key code information. This key code information has a structure in which a variable code 41 that changes according to a certain rule is added after the key code 31.

The functional block diagrams of the variable code type electronic key 42 and the receiving device 43 are shown in FIGS. 3 (a) and 3 (b). In each of the electronic key 42 and the receiving device 43, a fixed portion of the key code information, that is, the key code 31 is registered in the key code storage units 28 and 34, and the variable code generation units 44 and 46 store the key code information. A variable portion, that is, a variable code 41 is held. The variable code generation unit 44 of the electronic key 42 and the variable code generation unit 46 of the reception device 43
In each case, a new variable code 41 is generated for each transmission and reception according to the same conversion rule, and the same variable code 41 is held.

Then, the key switch 23 of the electronic key 42
When is pressed, the key code 31 and the variable code 41 are continuously transmitted as key code information from the electronic key 42. The variable code 41 is updated before or after transmitting the key code information.

Further, the receiving device 43 amplifies, demodulates, A / D converts the key code information received by the receiving circuit 32 and sends it to the code matching judging circuit 47. The code matching determination circuit 47 reads out the key code 31 from the key code storage unit 34, reads out the variable code 41 from the variable code generation unit 46, and collates with the received key code information. Received key code information and read key code 31 and variable code 41
If and match, the output circuit 35 is instructed to send a door lock opening / closing control signal.

According to such a variable code type keyless entry device, since the key code information is updated every time, even if the key code information is copied or intercepted, the receiving device receives a copy signal or the like. Does not unlock the door key to improve the anti-theft property.

[0015]

However, since there are a plurality of types of transmitters, that is, the fixed code type electronic key 21 and the variable code type electronic key 42, the fixed code type electronic key is present. If the key code information is copied in, the electronic key is lost or stolen, and the user needs to purchase a new electronic key, the receiving device may need to be replaced accordingly. It was For example, when exchanging the electronic key, if the keyless entry device of the same code system is not produced or is difficult to obtain, the electronic key and the receiving device must be exchanged at the same time. In that case, since the receiving device is incorporated inside the door of the vehicle, it takes time and effort to replace it, and the replacement cost is high.

Further, the vehicle manufacturer may have different key code information copy prevention measures depending on the vehicle type and the production time, or may have a new key code information copy prevention measure planned. However, the receiving device is not compatible with electronic keys having different key code information transmission / reception systems, and an electronic key and a reception device are required for each key code information transmission / reception system, resulting in a wide variety of products and poor production efficiency. It was

The present invention has been made in view of the drawbacks of the above conventional example, and an object of the present invention is to share a receiving device with a transmitting device having a different transmitting / receiving method of key code information. It is in.

[0018]

A receiver according to claim 1 has a plurality of communication formats, counts all bits of a transmission signal from a transmitter, and the transmission signal is determined by the total number of bits. It is characterized by determining which communication format is used and performing reception control in the determined communication format.

A remote control system according to a second aspect of the present invention includes a transmitting device for transmitting a signal in a predetermined communication format and a receiving device according to the first aspect, and a predetermined device is provided based on the signal from the receiving device. It is characterized by outputting a control signal.

According to a third aspect of the present invention, the remote control system is provided separately from the vehicle and transmits a unique key code information, and the remote control system is provided in the vehicle to receive and decode the key code information. 1 is provided, and opening / closing control of a door lock of the vehicle is performed based on a signal from the receiving device.

[0021]

In the receiving device according to the present invention, the total number of bits of the signal sent from the transmitting device is counted, and it is determined which communication format the transmitting signal is based on the difference in the total number of bits. That is, the transmission signal transmitted from the transmission device has a different total number of bits for each different communication format, and which communication format is determined from the total number of bits. Then, when the communication format is determined, the communication information is read and predetermined communication control is performed according to the communication format.

Therefore, according to the receiver or the remote control system of the present invention, the receiver can be used for a plurality of transmitters having different communication formats, and the receiver can be shared by a plurality of kinds of transmitters. .

[0023]

FIG. 4 is a block diagram showing a configuration of a receiving device 51 according to an embodiment of the present invention, which is a receiving device of a keyless entry device mounted on a vehicle.

This receiving device 51 is supplied with electric power from an on-vehicle battery 52, and has a receiving circuit 53, a bit counter 54, a code decoding unit 55, a timer 56, a communication format discriminating unit 57, and a code matching decision corresponding to a fixed code system. The circuit 33, a code matching determination circuit 47 corresponding to the variable code system, a key code storage unit 34, a variable code generation unit 46, and an output circuit 35.

The receiving circuit 53 receives a radio wave containing the key code information from the receiving antenna 36, amplifies and demodulates it, and A / A
After D conversion, the bit data of the key code information is extracted from the received radio wave. The receiving circuit 53 outputs the received key code information to the code decoding unit 55. In addition, the receiving circuit 53
Sends a count signal to the bit counter 54 each time it receives a 1-bit signal, and resets and starts the timer 56.

The code decoding section (decoder) 55 decodes the key code information sent from the receiving circuit 53 bit by bit or at a time to restore the key code information of the electronic key,
It is transmitted to the communication format discrimination unit 57.

The bit counter 54 increments the count number by 1 each time it receives the count signal from the receiving circuit 53, and counts the bit number of the key code information. The timer 56 is for detecting the end of reception of the key code information, and is reset and started each time the receiving circuit 53 receives a 1-bit signal pulse, and the measurement time exceeds a predetermined waiting time T. And outputs a time-up signal to the bit counter 54. That is, the timer 56 monitors the time interval between 1-bit signal pulses, and after the receiving circuit 53 receives the signal pulse and the timer 56 starts, the receiving circuit 53 does not receive the next signal pulse. When the predetermined waiting time T has elapsed, it is determined that the key code information has ended, and a time-up signal is output.

Upon receiving the time-up signal from the timer 56, the bit counter 54 determines that the count number at that time is the total number of bits of the key code information, and transmits the information indicating the total number of bits to the communication format discriminating unit 57. .

The communication format discriminating section 57 discriminates the communication format from the information of the total number of bits of the key code information obtained by the bit counter 54. That is, if the total number of bits of the received key code information is X bits, it is determined that the key code information is in the fixed code format as shown in FIG. If the number is Y bits, it is determined that the key code information is the variable code type key code information as shown in FIG.

The electronic key used is shown in FIG.
In the case of the fixed code electronic key 21 as described in (a), the communication format determination unit 57 determines that the received key code information is based on the fixed code system, and the code decryption unit 55. The decrypted key code information is transferred to the code matching determination circuit 33 corresponding to the fixed code method. Further, when the electronic key used is the variable code electronic key 42 as described with reference to FIG. 3A, the communication format determination unit 57 determines that the received key code information is based on the variable code system. The key code information decrypted by the code decryption unit 55 is transferred to the code coincidence determination circuit 47 corresponding to the variable code system.

The key code storage unit 34 is composed of a non-volatile memory such as an E ² PROM and stores a key code 31 unique to the receiving device as shown in FIG. 5 or 6.

The variable code generator 46 changes the variable code for each reception according to a certain conversion rule and adds the variable code 41 to the key code 31 to form the variable code key code information as shown in FIG. It is a circuit to generate.

One of the code matching determining circuits 33 is activated when the key code information has a fixed code communication format, and is stored in the key code storage section 34 and the key code information transferred from the communication format determining section 57. The identified key code 31 is collated to determine whether they match, and the determination result is output to the output circuit 35.

The other code matching determination circuit 33 becomes active when the key code information has a variable code communication format, and is generated by the key code 31 and the variable code generation unit 46 read from the key code storage unit 34. The variable code 41 is collated with the key code information transferred from the communication format discrimination unit 57 to discriminate whether or not they coincide with each other, and the discrimination result is output to the output circuit 35.

When the output circuit 35 receives a signal indicating that the key code information matches from any one of the code matching determination circuits 33, it outputs a control signal to the door lock opening / closing control controller to lock or unlock the door lock. To do.

Thus, according to the receiving device 51, both the fixed code type electronic key 21 and the variable code type electronic key 42 can be used, and the receiving device can be used for electronic keys having different communication formats. 51 can be shared. That is, the receiving device 51 uses the bit counter 54
The total number of bits of the received key code information is counted, and the communication format is determined from the total number of counted bits. Then, the key code information is decrypted and collated by the communication control method according to the communication format, and it is determined whether or not the key code information is from the legitimate electronic key.

Although not described in detail, this receiving device 5
1 is a function of rewriting the key code 31 (and the variable code 41) so as to match the key code 31 (and the variable code 41) of the electronic key when the electronic key is lost and a new electronic key is purchased. Is equipped with.

The above-mentioned processing in the receiving device 51 is executed by using a microcomputer, etc.
6 is a flowchart showing an example of an operation for discriminating the format of received key code information. Hereinafter, a specific procedure for determining the communication format of the received key code information according to FIG. 7 and executing the communication control operation according to the communication format will be described.

The receiving device 51 is normally in the sleep mode (reception standby state) (S1), but when the receiving circuit 53 receives a signal, the sleep mode is released. When a signal pulse of the received signal is output from the receiving circuit 53 upon receiving the signal, the bit counter 54 counts the signal pulse for each bit and increments the count number by 1 (S2).
Further, the key code decryption unit 55 determines whether the signal pulse is "0" or "1" bit by bit (S3). Also, the timer 56 is set to the waiting time T and started (S
4).

Next, waiting for the next signal pulse to be sent from the receiving circuit 53, and when the next signal pulse is received before the waiting time T has passed (S5, S6), the bit counter 54 is incremented by 1 again. (S2), the signal pulse is "1"
Or "0" (S3), the waiting time T is reset to the timer 56 (S4), and the next signal pulse is received by the receiving circuit 5.
It waits to be sent from 3 (S5, S6).

While the key code information is continuously transmitted in this manner, the flow of steps 2 to 6 is repeated and the total number of bits of the key code information is obtained by the bit counter 54. Further, the code decoding unit 55 decodes the key code information bit by bit.

Thus, if the next signal pulse is not sent from the receiving circuit 53 even after the waiting time T set in the timer 56 has passed (S6), it is judged that the reception of the key code information is completed, The count value of the bit counter 54 is regarded as the total number of bits of the key code information.

Next, the communication format discrimination unit 57 determines whether or not the total number of bits of the key code information obtained by the bit counter 54 is equal to the total number of bits X of the fixed code system (S7). If the total number of bits of the key code information is equal to X bits, the code matching determination circuit 33 corresponding to the fixed code method is activated (S8), and the key code information and the key code 31 are compared (S12). If the key code information matches the key code 31, the door lock is locked or unlocked via the door lock opening / closing control controller. In this case, the variable code 41 does not change.

If the total number of bits of the key code information is not equal to X bits (S7), it is determined whether it is equal to the total number of bits Y of the variable code system (S9). If the total number of bits of the key code information is equal to Y bits, the code matching determination circuit 47 corresponding to the variable code method is activated (S10), and the key code information is collated with the key code 31 and the variable code 41. (S12). When the key code information matches the key code 31 and the variable code 41, the door lock is locked or unlocked via the door lock opening / closing control controller. In this case, the variable code 41 changes according to a predetermined conversion rule.

If the total number of bits of the key code information is not equal to X bits or Y bits (S7, S9), the received signal does not match the communication format of any corresponding key code information. Judge as noise (S1
1).

In the above embodiment, the case of the fixed code type key code information and the variable code type key code information has been described, but fixed codes having different bit lengths or variable codes having different bit lengths may also be used. It is also possible to determine and perform different communication control. Further, not only the two types of communication format types, but also the three or more types of communication format types as long as the bit lengths of the respective types are different from each other,
It is also possible to discriminate by this method and perform communication processing according to each format.

Further, in the above embodiment, the case of a vehicle-mounted keyless entry device for locking / unlocking a door lock using radio waves has been described, but it goes without saying that a method using infrared rays may also be used. . further. The code can be collated from the electronic key using radio waves or infrared rays, and if the codes match, it can also be used in a remote-controlled engine starter system that controls the engine starter. Further, it is apparent from the essence of the above invention that it has a wide range of applications in addition to these.

[0048]

In the receiving device or remote control system of the present invention, the communication format can be determined from the total number of bits of the received key code, and the communication control can be performed by the method according to the determined communication format. . Therefore, one receiving device can be used for transmitting devices having different communication formats, and the receiving device can be shared.

Therefore, since the number of manufacturing models of the receiving device can be reduced, the manufacturing efficiency can be improved and the cost of the receiving device and the remote control system can be reduced. In addition, since the number of types of receiving devices is reduced, it is advantageous in terms of inventory space.

In particular, when the receiving device is incorporated in a vehicle such as a vehicle-mounted keyless entry device, the selection of the model of the transmitting device is changed, or the transmitting device is stolen or lost and a different model is received. Even if the device is purchased, the receiving device can be used without removing it from the vehicle, and in such a case, the labor and cost of replacing the receiving device can be reduced.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a configuration of a keyless entry device.

2A is a functional configuration diagram of a fixed code type electronic key, and FIG. 2B is a functional configuration diagram of a receiving device of the same type.

3A is a functional configuration diagram of a variable code type electronic key, and FIG. 3B is a functional configuration diagram of a receiving device of the same type.

FIG. 4 is a functional block diagram showing a configuration of a receiving device according to an embodiment of the present invention.

FIG. 5 is a diagram showing a structure of key code information of a fixed code system.

FIG. 6 is a diagram showing a configuration of variable code key code information.

FIG. 7 is a flowchart showing an operation of the receiving device of the above.

[Explanation of symbols]

 21 electronic code of fixed code system 31 key code 33 code matching determination circuit corresponding to fixed code system 34 key code storage unit 41 variable code 42 electronic key of variable code system 46 variable code generation unit 47 code matching corresponding to variable code system Judgment circuit 51 Reception device 53 Reception circuit 54 Bit counter 55 Code decoding section 56 Timer 57 Communication format discrimination section

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Claims (3)

[Claims] 1. A communication having a plurality of communication formats, counting the total number of bits of a transmission signal from a transmission device, determining which communication format the transmission signal is in, and determining the communication. A receiving device that controls reception in a format. 2. A remote control system, comprising: a transmitter for transmitting a signal in a predetermined communication format; and the receiver according to claim 1, which outputs a predetermined control signal based on the signal from the receiver. 3. A transmission device, which is provided separately from the vehicle and transmits unique key code information, and a reception device according to claim 1, which is provided in the vehicle and receives and decodes the key code information. A remote control system for locking the door of the vehicle based on a signal from the receiving device.