JP2921170B2 - Key confinement prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key locking device for locking an ignition key in a vehicle while preventing the key from being locked.

[0002]

2. Description of the Related Art If a door is locked while an ignition key (hereinafter, referred to as a key) is inserted into an ignition key cylinder, the key is locked in the vehicle and cannot be unlocked again. In order to prevent such keys from being trapped, a key trapping prevention device is used which does not lock the door of the vehicle when the keys are inserted into the ignition key cylinder.

[0003]

However, such a conventional apparatus has a drawback that if a key is mistakenly left in the vehicle compartment or dropped into the vehicle, the key cannot be prevented from being trapped. Was. Therefore, the possibility remains that the ignition key is locked in the vehicle and cannot be unlocked.

[0004] The present invention has been made in view of the above-described problems of the conventional key confinement prevention device, and has been made to prevent the door from being locked when an ignition key is left in a vehicle cabin. Subject.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a key confinement prevention device including a transmission device integrated with an ignition key, and a vehicle device provided on a vehicle side for receiving a signal from the transmission device. The apparatus includes a receiving unit that receives and demodulates a predetermined signal, a code identifying unit that identifies a fixed code based on a signal obtained from the receiving unit, and a response when a certain code signal is received from the code identifying unit. A transmission unit for transmitting a code signal, wherein the vehicle device on the vehicle side transmits a fixed code when the vehicle door is open when the vehicle is stopped, and a transmission unit that transmits the fixed code. a receiver for receiving a signal obtained from the transmitting device after transmission, and the code identification part signal obtained from the receiving unit of the vehicle system to determine whether a reply code from the code <br/> de identification of the vehicle unit It is characterized in that it comprises a and unlock control section that gives an unlock output if there is a change in the locking direction of the door lock switch when another signal is obtained.

[0006]

According to the present invention having such a feature, when the vehicle is stopped and the driver's seat door is open, the fixed code signal is transmitted from the transmitting section on the vehicle side. Is receiving a signal from When receiving the signal of the fixed code, the transmitting device identifies whether or not the fixed code is included, and sends a reply signal when the fixed code is included. In the vehicle device, when this signal is received, even if the door of the vehicle is switched from the unlocked state to the locked state, an unlock output is given for a certain period of time so that the door of the vehicle cannot be locked.

[0007]

FIG. 1 is a block diagram showing a configuration of a transmitting apparatus according to one embodiment of the present invention. The transmitting device 1 is integrated with the ignition key of the vehicle or used together with the ignition key. As shown in the figure, an antenna switch (ANTSW) 3 for switching an antenna is connected to an antenna 2 in the transmitting apparatus 1. The antenna switch 3 includes a receiving unit 7 including a tuning circuit 4, an amplifying circuit 5, and a demodulating circuit 6 for receiving a signal of a predetermined frequency as shown in the figure.
Is connected. The receiving unit 7 outputs a signal demodulated by the demodulation circuit 6, and the output is provided to the code identifying unit 8. The code identification unit 8 identifies whether or not a fixed code is included when a signal is received. If the fixed code is included, a match signal is given to the trigger circuit 9 and the code generation unit 10. The trigger circuit 9 provides a trigger signal for transmitting a reply signal to the code generation unit 10 based on this signal. An operation switch 12 is connected to the trigger circuit 9 via an input interface (input I / F) 11. The input interface 11 supplies a signal to the trigger circuit 9 and the code generator 10 based on the switch input. The code generator 10 supplies a signal including a fixed code to the modulation circuit 13 based on these signals. The output of the modulation circuit 13 is provided to the oscillation circuit 14, and the oscillation is controlled. Then, the oscillation output is connected to the antenna switch 3 via the tuning circuit 15 and the amplifier circuit 16. Here, the modulation circuit 13, the oscillation circuit 14, the tuning circuit 15, and the amplification circuit 16 constitute a transmission unit 17 that transmits a fixed code signal at a constant level.

Next, FIG. 2 is a block diagram showing a configuration of a vehicle device 20 used corresponding to the transmitting device 1. As shown in FIG. In the figure, an antenna switch 22 is connected to an antenna 21 of a vehicle device 20, and a receiving unit 26 including a tuning circuit 23, an amplification circuit 24, and a demodulation circuit 25 is connected to one end of the antenna switch 22. The output of the receiving unit 26 is a CPU 27
Given to. The CPU 27 sends a code signal at predetermined time intervals, as described later, and controls unlocking of the door based on the returned signal. CPU2
7, a motor driver 29 including a forward / reverse relay and the like and a door lock motor 30 are connected via an output interface 28. The output interface 28, the motor driver 29, and the door lock motor 30 constitute an unlock control unit 31 that drives the door of the vehicle in the unlock direction. Further, a door switch 32a for detecting opening and closing of a door of a driver's seat of the vehicle, a door lock switch 32b for detecting a locked or unlocked state of the door, and a vehicle speed sensor 33 are provided. The signal is given to the CPU 27 via the. CPU2
7 also provides a fixed code signal to the modulation circuit 35. The modulating circuit 35, the oscillating circuit 36, the tuning circuit 37, and the amplifying circuit 38 constitute a transmitting section 39 for transmitting a fixed code signal.

Next, the operation of this embodiment will be described with reference to the flowcharts of FIGS. 3 and 4 and the time chart of FIG. Although the transmitting device 1 is realized by hardware as shown in FIG. 1, a flowchart is used to explain the operation. Now, when the operation starts, FIG.
In step (a) 41, it is checked whether or not the operation switch 12 has changed from off to on. If the state changes to the ON state, the process proceeds to steps 42 and 43, where the door lock data shown in FIG. If the switch does not change from the off state to the on state, the door lock data is set to 0 in step 44.
And Then, in step 45, it is checked whether a fixed code has been received from the vehicle device 20. If the fixed code is received, the return data is set to 1 in steps 46 and 47, and a code signal is transmitted. If the fixed code is not received, return data is set to 0 in step 48, and the process returns to step 41. The code signal is transmitted to the vehicle device 20 only when the operation switch 12 is turned on and when the fixed code is received. The signal to be returned here may be a fixed code such as that shown in FIG. 3B, including door lock data and reply data, or may be a reply code different from the received fixed code.

Next, the operation of the vehicle device will be described with reference to the flowchart of FIG. When the operation is started, first, at step 51, it is checked whether a signal is not obtained from the vehicle speed sensor 33 and the vehicle is stopped. If the vehicle is running, the process ends.
Then, it is checked whether the door is opened by the door switch 32a on the driver's seat side. If the door is closed, the process is terminated. If the door is open as shown in FIGS. 5A and 5B, the process proceeds to step 53 where a fixed code is given to the modulation circuit 35. Then, the fixed code is transmitted from the transmission unit 39 at a constant frequency. Then, the vehicle device 20 waits for a short time in step 54, and proceeds to step 55 to check whether a fixed code is received. Here, the steps 51 to 53 of the CPU 27, the door switch 32a, the vehicle speed sensor 33, and the transmission section 39 constitute a transmission means for transmitting a fixed code by radio waves when the vehicle door is open when the vehicle is stopped. . The transmission of the fixed code is periodically performed at intervals of several hundred ms, for example, as shown in FIG.

If the transmitting apparatus 1 is located in an area in the vehicle where the fixed code signal can be received, the fixed code signal is received via the antenna 2, the antenna switch 3 and the receiving section 7, and the code identification is performed. The part 8 identifies the fixed code. When the fixed code is received, a reply code is generated by the code generation unit 10 via the trigger circuit 9, and a fixed code with the reply data set to 1 is transmitted from the transmission unit 17. In step 55, a reply from the transmitting device 1 is awaited. If a signal is received, it is checked whether or not the fixed code portions match (step 56). If the fixed code has been received, it is checked in step 57 whether or not the door lock switch 32b has changed from the unlocked state to the locked state. As shown in FIG. 5 (d), when the state changes from the unlocked state to the locked state, it indicates a state in which the driver manually locks the door, and when the door is closed thereafter, the door of the vehicle is locked. Becomes Therefore, proceed from step 57 to step 58 to prevent the key from being trapped,
An unlock signal is output, for example, for 5 seconds as shown in FIG. This prevents the door of the vehicle from being locked while the key is left in the vehicle by mistake. Where CPU
Reference numeral 27 fulfills the function of the code identification means 27a for determining whether or not the received signal given from the receiving section 26 in step 56 matches the fixed code.

In this embodiment, no signal is sent from the vehicle device when the vehicle is running or the driver's seat door is closed. Therefore, since the transmitting device 1 does not receive the signal and does not return the signal from the transmitting device 1, the consumption of the battery in the transmitting device can be reduced.

[0013]

As described above in detail, according to the present invention, when the vehicle is stopped and the driver's seat door is opened, the fixed code is transmitted to the transmitting device integrated with the key,
The door of the vehicle is not unlocked if there is a signal from the transmitting device. Therefore, the door of the vehicle is not locked not only when the key is mounted on the key cylinder but also when the key is left in the vehicle.
Therefore, the effect of reliably preventing the ignition key from being locked in the vehicle can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a transmission device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a vehicle device according to the present embodiment.

FIG. 3 is a flowchart illustrating an operation of the transmitting apparatus according to the embodiment.

FIG. 4 is a flowchart illustrating an operation of the vehicle device of the present embodiment.

FIG. 5 is a time chart showing the operation of the vehicle device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitting device 2, 21 Antenna 3, 22 Antenna switch 7, 26 Receiving part 8 Code discriminating part 9 Trigger circuit 10 Code generating part 12 Operation switch 17, 39 Transmitting part 20 Vehicle device 27 CPU 27a Code discriminating means 30 Door lock motor 31 Unlock controller 32a Door switch 32b Door lock switch 33 Vehicle speed sensor

Claims (1)

(57) [Claims] 1. A key confinement prevention device comprising: a transmission device integrated with an ignition key; and a vehicle device provided on a vehicle side for receiving a signal from the transmission device, wherein the transmission device includes the predetermined A receiving section that receives and demodulates a signal of the above, a code identifying section that identifies a fixed code based on a signal obtained from the receiving section, and a return code signal when a certain code signal is received from the code identifying section. A transmission unit that transmits a fixed code when the vehicle door is open when the vehicle is stopped, and a transmission unit that transmits a fixed code. a receiver for receiving a signal obtained from the transmitting device after transmission, and the code identification part signal obtained from the receiving unit of the vehicle system to determine whether a reply code, the vehicle unit Key containment prevention device, characterized by comprising a unlock control section that gives an unlock output if there is a change in the locking direction of the door lock switch when the identification signal from the code identification part is obtained.