JPH0771338B2 - Receiver - Google Patents

Description

[Detailed Description of the Invention] In a wireless communication type receiver having no squelch circuit, when communication data with matching identification data is received, lock / unlock control of the door is performed, and
An alarm is generated when the communication data is continuously received for a predetermined time or longer. In this way, while adding a new function to the function based on the communication data to achieve high functionality,
Prevent the theft of vehicles. Further, the judgment of continuous reception is realized by a simple structure without using a special structure such as a squelch circuit in the frequency modulation method. Furthermore, the continuous reception is determined only when the identification data match, and the malfunction of the additional function is prevented.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver that is preferably implemented as a receiver of a remote control device such as a so-called keyless entry system for automobiles.

2. Description of the Related Art The keyless entry system is a device that can lock / unlock the door of an automobile by remote control even from a position away from the automobile, such as a driver. Is a device capable of remotely operating a lock / unlock of a door or a trunk without using a key by carrying a transmitter and pressing a push button switch of the transmitter.

In the keyless entry system, unique identification data is predetermined between the paired transceivers, and when the push button switch is pressed, the identification data is frequency-modulated and transmitted.

When the reception electric field intensity detected by the squelch circuit in the standby state becomes equal to or higher than a predetermined threshold value, the receiver takes in data and collates the identification data. In this way, if the identification data match, the lock / unlock operation of the door is performed.

In this way, the receiver receives and responds only to the control signal from the transmitter that matches the identification data registered in the receiver, and performs the lock / unlock control of the door. As a result, security functions such as theft prevention are improved.

On the other hand, anti-theft devices have been actively developed in recent years. This device is a device that detects that a thief has entered the vehicle without using a formal key and issues an alarm. Current anti-theft devices are configured to generate an alarm by detecting that a window glass has been destroyed, for example. However, even if the owner of the vehicle discovers from a distance that the thief is prowling around the vehicle and is about to enter the vehicle, he / she may not be able to give an alarm and damage the vehicle. There is a problem that it cannot be prevented.

Therefore, there has been a demand for an anti-theft device in which the transceiver of the key entry system is combined with such an anti-theft device and the security function is further improved. However, if such an additional function is added to the transceiver, the structure becomes complicated.

An object of the present invention is to provide a receiving device capable of preventing a thief from invading a vehicle by using a transmitter that controls locking / unlocking of a vehicle door.

Means for Solving the Problems The present invention, in a receiving device for receiving communication data including identification data from a transmitting device, controls locking / unlocking of a door when communication data matching the identification data is received. Control means, judgment means for judging whether or not the communication data has been continuously received for a predetermined time or longer, and warning means for issuing an alarm when the judgment means judges continuous reception. It is a receiving device.

Further, the present invention is a receiving device that repeatedly receives at least two or more types of data including identification data from a transmitting device as communication data, wherein a determination criterion is set for each type of the data, and the type of data in the communication data is set. Each time, the comparison with the previously stored data is repeated, and when the result of the comparison within the predetermined set time satisfies all the judgment criteria for each type of the data, it is determined that the continuous reception is performed. The receiving device is characterized in that.

Furthermore, the present invention is characterized in that the criterion for determining the type of data having a large amount of data is set smaller than the criterion for determining the type of data having a small amount of data.

Operation According to the invention, the control means receives the communication data including the identification data from the transmitting device, and when the communication data matching the identification data is received, the lock / lock of the door
Perform unlock control. The determination means measures the reception duration of the communication data in which the identification data match, and when the communication data is continuously received for a predetermined time or longer, the alarm means is activated and an alarm is generated.

Therefore, when the owner of the vehicle discovers that the thief is about to enter the vehicle, an alarm will be issued if the communication data is continuously transmitted for a predetermined time or longer, and the intrusion of the thief can be prevented. can do.

Further, according to the invention, at least two kinds of data including identification data, for example, a data body including identification data, bit synchronization data, and frame synchronization data are repeatedly transmitted from the transmission device as communication data. In response to this, in the receiving device, the judgment standard is set for each type of the data, and the data for each type is repeatedly compared with the previously stored data, and within the predetermined set time. As a result of the comparison, it is determined that continuous reception is performed when the determination criteria for all types of data are satisfied.
That is, for example, the criterion for determining the type of data having a large amount of data such as the identification data is set smaller than the criterion for determining the type of data having a small amount of data such as the bit synchronization data and the frame synchronization data.

Therefore, when noise is mixed in a certain data part in the communication data, the remaining data part in the communication data is not counted as noise. That is, when noise is randomly mixed in each data part in the communication data, it is determined that the data is matched in the data part in which no noise is mixed, and the judgment standard is approached. Therefore, when the data that is repeatedly transmitted is received, each data portion gradually meets the determination criterion. As a result, it is possible to reduce the influence of noise as compared with the case where the determination standard is set only for the entire data section. Further, if the configuration is such that continuous reception determination is performed when error-free data is received over the set time, once noise is detected, further reception must be performed for the set time from that point. Therefore, the responsiveness can be improved as compared with such a configuration.

Furthermore, since a smaller threshold value is set for data with a larger capacity, this also makes it possible to determine continuous reception even if a reception error slightly occurs due to noise or the like, and a large threshold value is set for data with a small capacity. Since it is provided, it is possible to reliably prevent erroneous reception. In addition, for continuous reception judgment,
It is not necessary to use a special configuration such as the squelch circuit in the frequency modulation method, and furthermore, since the received communication data is compared with the data stored in advance, erroneous reception of data can be prevented. it can.

Embodiment FIG. 1 is a block diagram showing the electrical construction of an embodiment of the present invention. A transmitter 1 carried by a driver or the like includes an antenna 2, a transmission circuit 3, a push button switch 4, and a read only memory (hereinafter abbreviated as ROM) 5.

On the other hand, the receiver 11 mounted on the vehicle body 10 of the automobile has an antenna 12, a receiving circuit 13, a waveform shaping circuit 14, a ROM 15, and
Processing circuit realized by a microcomputer
It consists of 16 and.

Identification data identical to each other are stored in the ROMs 5 and 15, and the identification data is individually set for each vehicle body 10. When the operator operates the push button switch 4 of the transmitter 1, the antenna 2 of the transmitter 1 amplitude-modulates and transmits the data including the identification data stored in the ROM 5.

In a reception standby state such as when the vehicle is stopped, the data signal from the transmitter 1 is received by the antenna 12, is shaped into a data pulse by the waveform shaping circuit 14 via the receiving circuit 13, and is input to the processing circuit 16. . In the processing circuit 16, when the identification data of the input data pulse matches the identification data stored in the ROM 15, the operation state of the electromagnetic solenoid 21 such as the door or trunk of the vehicle body 10 is switched.

That is, when the door or the trunk is in the unlocked state, it is brought into the locked state by operating the push button switch 4. At this time, the horn 22 is sounded once and
A response operation of turning on the stop indicator light 23 once is performed to notify the operator that the lock state has been established. On the other hand, when it is in the locked state, it is brought into the unlocked state by operating the push button switch 4. In addition, a response operation is performed in which the horn 22 is sounded twice and the stop indicator light 23 is turned on twice to notify the operator that the unlocking state has occurred. In this way, so-called keyless entry is realized.

Further, the processing circuit 16 is connected with a vehicle theft sensor such as a hood switch 24 which is turned on when the bonnet is opened, or a cartesis switch 25 which is turned on when the door is opened. When the hood switch 24 and the cathesis switch 25 are turned on while the anti-theft switch 26 is on, the processing circuit 16 sounds the horn 22 to give a theft alarm.

On the other hand, the data D of the data signal transmitted from the transmitter 1 to the receiver 11 is composed of bit synchronization data D1, frame synchronization data D2, and identification code data D3, as shown in FIG. 2, for example. If all the data match, the lock / unlock operation of the door is performed.

Further, when the data receiving state as described above continues for a predetermined time W or more continuously, it is determined that the vehicle body 10 has been stolen in response to the operation from the transmitter 1, and the antitheft operation is performed. Is done. That is, this operation is performed by the owner of the transmitter 1 when the vehicle is about to be stolen, or when a passenger is attacked by a thug while trying to get into the vehicle and the push button switch 4 is kept above the time W. By operating it for a long time, the antitheft operation is performed and the criminal is threatened. The anti-theft operation is, for example, ringing of the horn 22 during a predetermined time Wa or blinking of the stop indicator light 23.

FIG. 3 is a flow chart for explaining the data receiving operation of the embodiment of the present invention. In step s1, it is judged whether or not the data D is received, and when the data D is received, the process proceeds to step s2. The data D is judged to have been received when the bit synchronization data D1 and the frame synchronization data D2 are correct. In step s2, the identification data
It is judged whether or not D3 matches, and if not, the process returns to the step s1.
Move to s3.

At step s3, the anti-theft operation is set / reset. That is, if the current state is the set state, the reset is performed, and if the current state is the reset state, the reset is performed. Next, at step s4, the lock / unlock operation of the door is performed. That is, if the current state is the lock state, unlocking is performed, and if the current state is the unlocking state, locking is performed. If you want to set at step s3, press step s4
The door is locked at, and when resetting at step s3, the door is unlocked at step s4. In step s4, the response operation indicating that the operation has been performed is performed. In step s5, the timer in the processing circuit 16 starts the counting operation at the time when the reception of the data D is thus started.

In step s6, similarly to step s1, it is determined whether or not the data D is continuously received. If not, this step s6 is repeated, and when the data D is continuously received, the process proceeds to step s7. In step s7, the identification data D3 is collated again. If they match, the process moves to step s8, and if they do not match, step s1.
Return to.

In step s8, it is judged whether or not the count time W1 of the timer is equal to or longer than the predetermined time W of, for example, about 2 seconds. If not, the process returns to step s6, and when the time W elapses, the process proceeds to step s9. . Step s9
Then, after the anti-theft operation is performed, the step s1
Return to. Thus, in steps s6 to s9, the antitheft operation by the operation of the transmitter 1 is realized.

When the data D is not received in the step s1, the process proceeds to step s10a, and it is judged whether or not the anti-theft operation is set.
In s10b, it is determined whether or not the theft has occurred, and if so, the process proceeds to the step s9 and the antitheft operation is performed. In this way, the steps s10a, s10b, s9 realize the antitheft operation by the vehicle theft sensor. When the anti-theft operation is not set in step s10a, and when it is determined that it is not theft in step s10b, the process returns to step s1. Thus, when data D is not received and when the theft is not detected, these steps s1 , s10a, s10b are repeated.

FIG. 4 is a flow chart for explaining the antitheft operation. At step s41, the counting operation of the timer is started. At step s42, the horn 22 is sounded, and at step s43, the stop indicator light 23 blinks. In step s44, the count time W1a of the timer is
It is determined whether or not a predetermined time Wa of about 60 seconds has elapsed. If not, the process returns to step s42 to continue the antitheft operation, and if so, the operation is terminated.

As described above, in the receiver 11 according to the present invention, when the owner of the vehicle finds that the thief is about to enter the vehicle, the push button switch 4 is operated over the time W or more, Anti-theft operation is performed. Accordingly, it is possible to prevent damage to the vehicle and prevent a thief from invading the vehicle.

Further, according to the operation state of the push button switch 4, two operations, a lock / unlock operation of the door and an anti-theft operation, are performed without using a special configuration such as a squelch circuit as described in the section of the prior art. Since it is realized, the transmitter 1 can be used for these two operations to simplify the configuration, and the functionality can be significantly improved.

FIG. 5 is a flow chart for explaining the data receiving operation of another embodiment of the present invention. This embodiment is similar to the above-mentioned embodiment, and the same reference numerals are given to corresponding parts. In this embodiment, when the data D match at step s7, the count value N1 of the counter in the processing circuit 16 is counted at step s11, and then the process proceeds to step s8. If the reception of the data D is not detected at step s6 and if the data D does not match at step s7, the process directly goes to step s8.

In step s8, when the count time W1 of the timer exceeds the predetermined time W, the process proceeds to step s12, and it is judged whether or not the count value N1 is equal to or more than the predetermined value N, and if so, the step s9 Then, the antitheft operation is performed, and if not, the count value N1 of the counter is reset in step s13 and the process returns to step s1.

It should be noted that the data D is transmitted from the transmitter 1 about 20 times during the time W of 2 seconds, so that the value N is set to about 16.

Therefore, even if a reception error occurs to some extent due to noise or the like, continuous reception can be determined, and the antitheft operation can be realized with higher accuracy.

FIG. 6 is a flow chart for explaining the data receiving operation of still another embodiment of the present invention. This embodiment is similar to the above-mentioned embodiment, and the corresponding portions bear the same reference numerals. In this embodiment, in step s19, if the bit synchronization data D1 match, it is determined that the continuous reception is performed. At that time, in steps s20 and s21, which of the data D has been received without error is determined. Judged,
Based on the result of the determination, the counting operation is performed in steps s22 to s24.

That is, when all the data D up to the identification data D3 have been received without error, the process proceeds from step s20 to step s22, and the count value Na of the bit synchronization data D1 and
The count value Nb of the frame synchronization data D2 and the identification data D3
All count values with the count value Nc of are added.

When the frame synchronization data D2 is received without any error, the process proceeds from step s21 to step s23, and the count value Na of the bit synchronization data D1 and the count value Nb of the frame synchronization data D2 are added. Furthermore, if only bit synchronization data D1 is received, step s2
The procedure moves from 1 to step s24, and the count value Na of the bit synchronization data D1 is added.

From steps s22 to s24, the process proceeds to step s25, where after the count value W11 indicating that the data D has not been received is reset, the process proceeds to step s8. When the continuous reception of the data D is not detected in the step s19, the count value W11 is added in the step s26, and then the process proceeds to the step s27.

In step s27, it is determined whether or not the count value W11 is equal to or greater than the predetermined value W10.
If it continues for 10 or more, all the count values are reset in step s28 and the process returns to step s1.

If the count value W11 is less than the value W10 in step s27, the process proceeds to step s8. In step s8, it is judged whether or not the count time W1 of the timer is equal to or longer than the predetermined time W, and if not, the process returns to step s19, and if yes, the process proceeds to step s31.

In steps s31 to s33, each count value N1a,
It is judged whether or not N1b and N1c are greater than or equal to predetermined values Na, Nb and Nc, and only when all of them are satisfied, the above steps are carried out.
When the antitheft operation is performed in s9 and any one of them is not satisfied, all the count values are reset in step s28, and then the process returns to step s1. Note that, for example, the value Na is set to 16 and the value Nb is set to 10,
The value Nc is set to 6.

Therefore, in the present embodiment, the bit synchronization data D1, the frame synchronization data D2, and the identification data D3 are set to a smaller threshold as the data capacity increases, and a good reception state is continuously set in the steps s31 to s33. The anti-theft operation is performed only when all the conditions shown in are satisfied and the count value W11 in the no-receive state at step s27 is less than the predetermined value W10, so that both responsiveness and determination accuracy are improved. can do.

EFFECTS OF THE INVENTION As described above, according to the present invention, when the owner of a vehicle discovers that a thief is about to enter the vehicle, an alarm is issued if the communication data is continuously transmitted for a predetermined time or longer. Therefore, the intrusion of the thief can be prevented in advance. Moreover, since it also serves as a transmitter for locking / unlocking the door, it can be realized at low cost.

Further, according to the present invention, since the judgment criterion is set for each type of data, when noise is randomly mixed in each data part in communication data, it is determined that the data is matched in the data part in which noise is not mixed. When the data is judged and approaches the criterion, and the data transmitted repeatedly is received, each data portion gradually meets the criterion. Therefore, compared with the case where the determination standard is set only for the entire data section, it is possible to make it less susceptible to noise and improve the responsiveness.

Still more preferably, the smaller threshold value is set for the larger capacity data, so that even if a reception error occurs to some extent due to noise or the like, continuous reception can be determined, and the large threshold value is set for the small capacity data. Can be reliably prevented. Further, it can be realized with a simple configuration without using a special configuration such as a squelch circuit in the frequency modulation method for continuous reception determination. Furthermore, since the communication data determined to be continuously received is compared with the data stored in advance, erroneous reception of data can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of an embodiment of the present invention, FIG. 2 is a diagram showing a format of data D transmitted from a transmitter 1, and FIGS. 3 and 4 are ones of the present invention. FIG. 5 is a flow chart for explaining the operation of the embodiment, and FIG. 5 is a flow chart for explaining the operation of the other embodiment of the present invention.
The figure is a flow chart for explaining the operation of still another embodiment of the present invention. 1 ... Transmitter, 3 ... Transmission circuit, 4 ... Pushbutton switch,
5,15 …… ROM, 10 …… Car body, 11 …… Receiver, 13 …… Reception circuit, 16 …… Processing circuit, 21 …… Electromagnetic solenoid, 22 ……
Horn, 23 ... Stop indicator light

Claims (3)

[Claims] 1. A receiving device for receiving communication data including identification data from a transmitting device, and a control means for controlling lock / unlock of a door when communication data having the same identification data is received, and the communication. A receiving device comprising: a judgment unit that judges whether or not data has been continuously received for a predetermined time or longer; and an alarm unit that gives an alarm when the judgment unit judges continuous reception. 2. A receiving device for repeatedly receiving at least two or more types of data including identification data from a transmitting device as communication data, wherein a determination criterion is set for each type of the data, and a type of data in the communication data is set. Each time, the comparison with the previously stored data is repeated, and when the result of the comparison within the predetermined set time satisfies all the judgment criteria for each type of the data, it is determined that the continuous reception is performed. A receiver characterized by being. 3. The receiving apparatus according to claim 2, wherein the criterion for judging the type of data having a large amount of data is set smaller than the criterion for judging the type of data having a small amount of data.