JPH0512450Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention relates to a remote control door locking device that can prevent theft in a device that can remotely lock or unlock a car door.

<Technical background of the invention and its problems> In order to further improve the convenience of getting on and off the vehicle, a device has been proposed that can lock or unlock the door using a remote control (hereinafter referred to as remote control). However, in such a device, if a malicious person continuously changes the transmission code according to a predetermined procedure and sends it, there is a fear that the door will eventually be opened because the number of registered codes is limited. Therefore, conventional techniques have been developed to prohibit the control of the lock mechanism upon continuous reception of fraudulent codes (Japanese Unexamined Patent Publication No. 60-47178), and technology to issue an alarm when a fraudulent code is received three times in a row (Japanese Patent Application Laid-Open No. 61-37362).
However, both techniques were inconvenient because the door lock could only be unlocked using a mechanical key after the lock mechanism was inhibited or an alarm was issued.

<Purpose of the invention> The present invention was made in view of the above points, and its purpose is to prevent theft by prohibiting input reception and warning in a device that locks or unlocks a car door using a remote control.
The object of the present invention is to provide a remote control door lock device that accepts input after that.

<Summary of the invention> A transmitting unit that modulates and transmits a code to lock or unlock a car door, a light receiving unit that demodulates the signal sent from this transmitting unit and outputs it to a control unit, and a signal sent from this light receiving unit. In the control unit that locks or unlocks the door by decoding the code, if the receiving unit receives a transmission code different from the registered code two or more times in a row, it will only accept input for 5 seconds as the first predetermined time. After that, the input reception prohibition is canceled, the door can be unlocked with the registration code, and a different transmission code is similarly received within 1 second as the second predetermined time after the input reception prohibition is canceled. This is a remote control door lock device that outputs an alarm when a vehicle is stolen to prevent theft of the vehicle.

<Embodiment of the invention> An embodiment of the invention will be described below with reference to the drawings. First, the outline of this apparatus will be explained with reference to FIG. In FIG. 2, numeral 11 is a transmitting unit that transmits a coded signal etc. twice at a time by infrared rays. This transmitting unit 11 is operated by the driver, and its signal is received by light receiving units 12 and 13 provided inside the vehicle. The light receiving units 12 and 13 send received signals to a control unit 14. This control unit 14 decodes the received signal and processes the decoded signal. In other words, the processes include locking and unlocking the doors, unlocking the trunk, sounding the horn, and turning on the room lamp.

Next, the overall configuration of this device will be explained with reference to FIG. In FIG. 1, reference numeral 2 designates a transmission switch which constitutes a part of the transmission unit 11 and is operated when locking or unlocking a door or unlocking a rank. When the transmission switch 21 is operated, power is supplied to the CPU 23. This CPU 23 is programmed to output a unique code when power is supplied, and the output signal of this CPU is sent to a display LED (light emitting diode) 22 and a transmission LED 24.
At this time, the display LED 22 lights up, and the transmission LED 2
4 transmits, for example, a 16-bit infrared pulse modulated transmission code to the light receiving units 12 and 13. The infrared pulses are received by photodiodes 25, 26 facing the driving direction or the passenger seat, or by a photodiode 27 facing the trunk. This photodiode 2
The signals obtained by 5, 26 and 27 are output to light receiving circuits 28 and 29. This light receiving circuit 28, 2
Reference numeral 9 comprises a circuit for amplifying and demodulating the signals inputted from the photodiodes 25, 26 and 27 and outputting the signals.
Regarding 4, when a comparison circuit that compares the input signal with an internal unique code deems a match, it is determined based on information from the door lock switch, etc. whether to lock or unlock the door or unlock the trunk. It consists of a circuit and a driver that drives a relay coil, which will be described later. One end of each of relay coils 31 to 34 is connected to this control unit 14. Note that the anode of a battery 46 is connected to the other ends of the relay coils 31 to 34. Also,
The relay coil 33 is energized when the door is unlocked, the relay coil 32 is energized when the door is locked, the relay coil 31 is energized when the trunk is unlocked, and the relay coil 34 is energized when the horn is sounded. Further, one ends of the relay switches 32S to 34S are grounded, and one end of the relay switch 31S is connected to the anode of the battery 46. The other end of the relay switch 33S is connected to the anode of the battery 46 through the door unlocking relay coil 35, and the other end of the relay switch 32S is connected to the battery 46 through the door locking relay coil 36.
connected to the anode of the The other end of the relay switch 33S is connected to the UL terminal of the door lock switch 42, and the other end of the relay switch 32S is connected to the L terminal of the door lock switch 42. Furthermore, the other end of the relay switch 31S is connected to a circuit 43 that drives a trunk unlocking solenoid.
The other end of the relay switch 34S is connected to a circuit 44 for sounding a horn. By the way, the relay switch 35S is always closed to the grounded contact a side, and the contact b side is connected to the anode of the battery 46. Furthermore, the relay switch 35
Contact point c of S is connected to one end of door locking or unlocking motors 37 to 40 provided for each door. Here, the motor 37 is for the driver's seat, 38 is for the passenger seat, and 39 and 40 are for the rear seat. 36S is closed to the contact e side which is always grounded, and the contact f is connected to the anode of the battery 46. Further, the contact g of the relay switch 36s is connected to the other end of the motors 37-40. In addition to the above, a room lamp 45 is also connected to the control unit 14 together with the B terminal of the room lamp switch 41. Furthermore, the D terminal of the room lamp switch 41 is connected to the control unit 1 together with the door switch group 47.
Connected to 4. Further, a door lock switch 48 on the driver's seat side and a door lock switch 49 on the passenger's seat side are each connected to the control unit 14.

Next, the operation of an embodiment of the invention constructed as described above will be explained with reference to the flowchart of FIG. The processing in the flowchart of FIG. 3 is carried out by the control unit 14, and in step S1 it is determined whether the transmission code sent from the transmission unit 11 is a proper code. If the answer is ``YES'' in step S1, the program proceeds to step S2, where it is determined whether or not the door is currently locked by inputting the door lock switches 48 and 49. If the determination is ``YES'' here, the process advances to step S3 and the door lock is released. That is, the relay coil 33 is excited by the control unit 14. Therefore, the relay switch 33S is closed and the relay coil 35 is energized.
Therefore, the relay switch 35S closes to the contact b side, and the battery 46 moves from the contact b to the contact c to the motor 3.
Current flows through contacts 7 to 40, contact g, and contact e. Therefore, current flows through the motors 37 to 40 in the direction of the solid line arrow, causing the motors to rotate forward and unlocking the door. Then, in step S4, the flag is reset and the process returns to step S1. On the other hand, the determination in step S2 is "NO", that is, the door lock switches 48, 49
If it is determined from the input that the door lock is in the unlocked state, the process advances to step S5. That is, the relay coil 32 is excited by the control unit 14. Therefore, the relay switch 32S is closed and the relay coil 36 is energized. Therefore, the relay switch 36S closes to the contact f side, and the battery 4
Current flows from 6 through contacts f, g, motors 37 to 40, contacts c and a. For this reason,
Current flows through the motors 37 to 40 in the direction of the dashed arrow, causing the motors to rotate in reverse and the door to be locked. and,
After the process of step S4, the process proceeds to step S1. By the way, if the determination in step S1 is "NO", the process advances to step S6. That is, this is a case where the above transmission code is not a proper code. In this case, it is determined in step S6 whether the flag is "1" or not. Here, since the flag has been reset, the determination is "NO" and the process proceeds to step S7. In this step S7, time is counted, and the process is not allowed to proceed to the next step S8 until N seconds have elapsed since entering this step. Here, N seconds is an arbitrary preset time. Step S7
After N seconds, the program advances to the next step S8, where the flag is set to "1". Then, the process returns to step S1. If the next transmission code is also not a proper code, the determination is ``NO'' in step S1, ``YES'' in step S6, and the process proceeds to step S9. If M seconds have not elapsed since the flag was set in this step S9, the next step S10
Proceed to processing. Here, M seconds is an arbitrary preset time. In this step S10,
The control unit 14 controls the relay coil 3.
4 is excited, and an alarm process is performed in which the horn is sounded twice, for example, at one-second intervals. Then, in step S4, the flag is reset and the process returns to step S1. On the other hand, the determination in step S9 is "NO". In other words, if M seconds have elapsed since the flag was set, the program proceeds to step S11 to reset the flag, and then proceeds to step S1 through the processes of step S7 and step S8. As mentioned above, if the sending code is not a proper code, N
Because it has a pause period of seconds, no input is accepted during that time, and even if a malicious person were to change the transmission code and try to unlock the lock, it would take a considerable amount of time. If an incorrect transmission code is entered, the horn sounds to sound an alarm, thereby preventing car theft.

<Effects of the invention> As detailed above, according to the invention, when the receiving unit receives a transmission code different from the registered code two or more times in a row in a device for locking or unlocking a car door using a remote control, , input reception is prohibited, but when the first predetermined time has elapsed, the input reception prohibition is canceled and unlocking becomes possible with the registration code, and at the same time, a second predetermined time is started to be counted. If a transmission code different from the registered code is received within a predetermined period of time, an alarm is output.

Therefore, if a transmission code different from the registered code is received, theft is reliably prevented, and the door can then be unlocked using the registered code, which is convenient and eliminates the hassle of unlocking using a mechanical key. be.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a remote control door lock device according to the present invention, FIG. 2 is a diagram showing an outline of the device, and FIG. 3 is a flowchart showing the operation of one embodiment. 11... Transmitting unit, 12, 13... Light receiving unit, 14... Control unit, 25...
...CPU31-34...Relay coil, 37-4
0...Motor.

Claims (1)

[Scope of utility model registration request] A transmitting unit that transmits a code to lock or unlock a car door, a receiving unit that decodes the code sent from the transmitting unit and locks or unlocks the door, and the receiving unit transmits a transmitted code different from the registered code. If the reception is received more than once in a row, the input reception is prohibited only for the first predetermined time, and within a second predetermined time set separately from the first predetermined time after the input reception prohibition is canceled, 1. A remote control door lock device comprising means for outputting an alarm when a different transmission code is received.