JPH04140383A - Radio type locking device for car - Google Patents

Abstract

PURPOSE:To make it possible to lock and unlock a door of a car through radio signals by providing a code signal output means, signal modulation means and signal comparison means, etc. to transmitting and receiving devices provided in the car and transmitting and receiving devices provided separately on the out side of the car. CONSTITUTION:A radio type locking device is constituted of a door lock section 1 incorporated into a car and a key card 2 to lock and unlock the door 1. While, the door lock section 1 is approximately constituted of a code generation circuit 3, antenna 5 to transmit and receive code signals, code comparator 11, and door lock mechanism 12, etc. The key card 2 is separately provided on the outside of the car, and it is approximately constituted of a transmitting and receiving antenna 19 from the door lock section 1, code signal detection circuit 22, detection comparator 24, transmission circuit 18 and code modulation circuit 20, etc. Code signal waves transmitted from the key card section 2 are received from the antenna 5 of the door lock section 1, and in the code comparator 11, code signals outputted from a detection circuit 10 is compared with code signals set to the code signal generation circuit 3, and when the code signals correspond with them, locking signals or unlocking signals are outputted to an actuator 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a card-type locking device for locking and unlocking doors of vehicles such as automobiles.

[Conventional technology] Car doors have traditionally been locked and unlocked using a cylinder key that also serves as a master switch for power and an engine start switch. I often come back to my senses and lock the door again.

To solve this inconvenience, a wireless door lock has been proposed in which the key has a built-in ultra-compact transmitter that emits weak radio waves, and the key plate is used as an antenna to transmit door lock/unlock signals to the car. ing.

With this wireless door lock, when you press the switch on the side of the key, the electronic circuit inside the key is activated to transmit weak radio waves (VH) from a transmitting antenna using the key plate.
F).

This weak radio wave contains an identification code (hereinafter referred to as an ID code), and the transmitted radio wave is received by the car's radio antenna, and the receiver built into the car reads the ID code contained in the received radio wave and the It checks to see if the vehicle ID codes match, and locks and unlocks the doors only if they match.

[Problems to be Solved by the Invention] However, such a wire rest alotter has the inconvenience of having to press a switch each time it is used, and is difficult to operate when holding something in both hands. Furthermore, wireless door locks have the problem that once the device is turned on, the transmitter is constantly energized, resulting in large power consumption and rapid battery consumption regardless of how hard the switch is operated.

SUMMARY OF THE INVENTION The present invention was made to solve the above problems, and aims to provide a wireless vehicle locking device that is easy to operate and consumes little power.

[Means for Solving the Problems] The present invention, which has been made to achieve the above object, consists of a transmitting/receiving device built into a vehicle and a transmitting/receiving device provided separately from the vehicle, and transmits signals to the vehicle via wireless signals. In the wireless locking device for locking and unlocking the doors of the vehicle, the transmitting/receiving device built into the vehicle includes a code signal output means for outputting an arbitrarily set code signal, and a code signal set by the code signal output means. a code signal transmitting means for transmitting a code signal as a radio wave from an antenna; a code signal receiving means for receiving a code signal transmitted from the outside via the antenna; a code signal output from the code signal receiving means and the code signal output means. a code signal comparing means for comparing and determining a code signal set by the code signal and outputting a locking/unlocking signal when the code signals match; and a code signal comparing means for outputting a locking/unlocking signal when the code signals match; The individually installed transmitting/receiving device includes a code signal generating means for outputting a preset code signal, and an antenna for transmitting radio waves transmitted from the outside. a code signal detection means for detecting a code signal from the radio wave; and a code signal detection means for comparing the code signal output from the code signal detection means with the code signal output from the code signal generation means to detect the code signal. code signal comparison means for outputting a transmission signal when a match is made; oscillation means for outputting a carrier signal only when the transmission signal from the code signal comparison means is input; and code signal comparison means for outputting a carrier signal from the code signal generation means; The gist of the present invention is a wireless locking device for a vehicle, comprising: a code signal modulating means for modulating a carrier wave from a carrier wave and transmitting the code signal from an antenna;

[Function] In the vehicle wireless locking device of the present invention, the code signal output means of the transmitting/receiving device built into the vehicle and the code signal generating means of the separately provided transmitting/receiving device are set to be the same, and When the transmitting/receiving device built in is turned on, the code signal transmitting means transmits the code signal as a radio wave from the antenna.

Next, when the power is turned on, the individually installed transmitting/receiving device receives radio waves from the transmitting/receiving device built into the vehicle, extracts a code signal from the radio wave, and outputs the extracted code signal to the code signal comparing means.

The code signal comparison means compares the code signal output from the detection means and the code signal output from the code signal generation means, and when these code signals match, outputs a transmission signal to the oscillation means. The oscillation means starts an oscillation action only when the transmission signal is input, and outputs a carrier wave to the modulation means. Since the code signal from the code generation means is input to the modulation means, the foot signal is modulated with a carrier wave and transmitted from the antenna.

Here, when the code signal receiving means of the transmitting/receiving device built into the vehicle receives the radio waves transmitted from the individually installed transmitting/receiving device via the antenna, the code signal receiving means extracts the code signal from the radio waves. and outputs it to the code signal comparison means.

The code signal comparison means compares and determines the code signal output from the code signal receiving means and the code signal set by the code signal output means, and when the code signals match, issues a locking or unlocking signal to lock/unlock the door. Output to means. As a result, the vehicle door is locked or unlocked.

[Example] Embodiments of the present invention will be described based on the drawings.

FIG. 1 is a schematic block diagram of a card end lean stem to which a radio wave type locking device for a vehicle according to the present invention is applied.

As shown in the figure, the card entry system is built into a vehicle such as a car, and includes a door lock unit 1 that locks and unlocks the door, and a key that sends a door lock/unlock operation signal to the door lock unit 1. It is composed of a cart section 2.

The door lock unit 1 modulates a carrier wave from a code generation circuit 3 and an oscillation circuit 4, which output a preset code signal as necessary, with a code signal output from the code generation circuit 3, and transmits the modulated signal from an antenna 5. A modulation circuit 6 that receives radio waves from the antenna 5 and amplifies them as they are at high frequency, a high frequency amplification circuit 7 that amplifies the radio waves as they are at high frequency, and a mixing circuit that converts the high frequency signal output from the high frequency amplification circuit 7 into an intermediate frequency signal using the oscillation signal from the oscillation circuit 4. Circuit 8, intermediate frequency amplification circuit 9 that amplifies the intermediate frequency signal
, a detection circuit 1o that extracts a low-frequency code signal from a modulated signal converted into an intermediate frequency signal, and a code signal outputted from the detection circuit IO is compared with a code signal set in the code generation circuit 3 to determine the code. A code comparison circuit 11 outputs a locking signal or an unlocking signal when the signals match, and a door locking mechanism 12 in response to a signal from the code comparison circuit 11.
an actuator 13 for causing a locking operation or an unlocking operation to be performed;
A DC power supply 14 that supplies voltage to each circuit, SW + that serves as a master switch for the power supply, and a timer circuit 15 that operates the switches SW, ~SW-SW, and ~SW4 that supply power to each circuit individually at different times. , and a transmission/reception switching circuit 16 that switches between a transmission state and a reception state.

Note that the high frequency amplifier circuit 71 oscillation circuit 4. The mixing circuit 8° intermediate frequency amplification circuit 9 and detection circuit 10 are well-known superhetero gain receivers.

On the other hand, the key card unit 2 includes a code generation circuit 17 and an oscillation circuit 1 that output pre-stored code signals as needed.
A modulation circuit 2 that modulates the carrier wave from 8 with a code signal output from the code generation circuit 17 and transmits it from the antenna 1g.
0, a tuning circuit 21 that receives radio waves from the antenna 1g, a detection circuit 22 that extracts a code signal from a carrier wave, and an amplifier circuit 23 that amplifies the code signal output from the detection circuit 22.
, a code comparison circuit 24 that compares the code signal output from the amplifier circuit 23 with the code signal set in the code generation circuit 17 and outputs an oscillation signal when the code signals match, and supplies DC voltage to each circuit. DC power supply 25, master switch SW5 of DC power supply 25, code comparison circuit 2
4, and a transmission/reception switching circuit 26 for switching between a transmission state and a reception state.

The operation of the card entry system of this embodiment having the above configuration will be explained.

First, the same code number is stored in a memory element (for example, a ROM of an 1-chip microcomputer LSI) provided inside the code generation circuit 3 of the door lock section 1 and the code generation circuit 17 of the key card section 2.

Next, when the SWI of the door lock section 1 is turned on, the timer circuit 15 starts operating, and the switches SWt to SW4 are intermittently repeated to turn on and off in accordance with the time chart shown in FIG.

Since SW and SW are ON between 11 and 12, the oscillation circuit 4. The code generation circuit 3 and the modulation circuit 6 enter the transmission state, and the modulation circuit 6 outputs a code signal. The transmission/reception switching circuit 16 is an automatic switching circuit using a well-known diode.
When the transmission output from the modulation circuit 6 is input, it enters a transmission state and transmits a code signal radio wave from the antenna 5.

Here, in the key card section 2, the master switch SW5
When the switch SW6 is turned on, the amplifier circuit 23, code generation circuit 17, and code comparison circuit 24 are turned on.
is off, so the oscillation circuit 18 and modulation circuit 2
0 remains OFF, and the transmission/reception switching circuit 26 enters the receiving state.

When the key card section 2 receives a code signal radio wave from the door lock section 1 via the tuning circuit 21 in this reception standby state, the detection circuit 22 extracts the code signal from the carrier wave of the received radio wave and transmits it via the amplifier circuit 23. It is output to the code comparison circuit 24.

The code comparison circuit 24 compares the code signal output from the amplifier circuit 23 and the code signal set in the code generation circuit 17, and when the code signals match, the switch S
Outputs an oscillation signal to W6.

When the switch S W a is turned on in response to the oscillation signal, the oscillation circuit ill and the modulation circuit 20 are each turned on, the transmission/reception switching circuit 26 is switched to the transmission state, and the code signal output from the code generation circuit 17 is transmitted to the radio wave from the antenna 1g. Sent as .

On the other hand, since the transmission/reception switching circuit 16 of the door lock unit 1 has already been switched to the receiving state, when the code signal radio wave transmitted from the key card unit 2 is received from the antenna 5, the high frequency amplifier circuit 71, the oscillation circuit 4, and the mixed The code comparison circuit 11 is connected to the circuit via the intermediate frequency amplification circuit 9 and the detection circuit 10.
is output as a code signal. The code comparison circuit 11 compares the code signal output from the detection circuit IO with the code signal set in the code generation circuit 3, and outputs a lock signal or an unlock signal to the actuator 13 when the code signals match.

In this way, the door lock section 1 and the key card section 2 exchange code signals with each other, and only when the code numbers match, the door lock mechanism of the door lock section 1 is locked or unlocked by a command from the key cart section. It is now possible to lock it.

The card entry system of this embodiment having the above configuration includes a timer circuit 15 and a switch SW in the door lock section 1.
, ~SW4 forms a delay circuit and limits the duration of the DC voltage supplied from the power supply to each circuit, so the power supply (
It is economical because the power consumption of batteries (for example, batteries, etc.) can be minimized.

In addition, by limiting the time the supply voltage is applied to each circuit, the amount of heat generated by each component is minimized, and LSI
This makes it possible to prevent damage and deterioration of performance, significantly improving durability.

On the other hand, the key card section 2 is provided with a code comparison circuit 24 and a switch SW6, and turns on the switch only when the code signal input to the code comparison circuit 24 and the code signal set in the code generation circuit 17 match. As the oscillation circuit Il
Since the oscillation circuit 1g is operated, the oscillation circuit 1g is not energized except when necessary, and power consumption can be kept to a minimum, which is economical. In addition, by limiting the energization time of the supply voltage to the oscillation circuit 11, the amount of heat generated by each component is minimized,
It is possible to prevent damage to the LSI and other components and deterioration of performance due to heat generated by parts, and durability is significantly improved.

In this embodiment, the code generation circuit 3 of the door lock section 1
Coat number setting section and code generation circuit 1 of key cart 2
The code generating circuit 3 of the key card 2 shown in FIG. 1 was replaced with the code generating circuit 3 of the key card 2 shown in FIG. As shown in FIG.
It is also possible to use the RAM of I.

This connects the memory circuit 30 and the code generation circuit 3 of the door lock section 1 via a cable 31 and a connector 32, and reads the code signal set in the door lock section 1 of the vehicle directly into the memory circuit 31. I try to memorize it.

This makes it possible to respond to changes in code numbers just by preparing one key card 2, and enables a card end lean system with a wider range of applications. Also,
In the card end lean stem of the above embodiment, as shown in FIG. A key plate 41 may be provided on the cart portion 4D, and the key plate 41 may be inserted into the key cylinder 42 of the vehicle to transfer the court signal. In this case, as shown in FIG. 4(a), an antenna 43 is built inside the key plate 41 and radio waves are used as the transmission medium, or as shown in FIG. 4(b), the key plate 41
Electrodes 41a and 41b are provided on both sides of the picture electrode 41, respectively.
A and 41b make the clamping body 41c a sandwich structure,
By using a method that uses current as a transmission medium, code signals can be easily transmitted.

[Effect on the invention] As explained above, the wireless locking device for a vehicle of the present invention receives a code signal transmitted from an individually provided transmitting/receiving device or a transmitting/receiving device built into the vehicle, and individually locks the vehicle. The separately installed transmitting/receiving device only compares it with the coded signals set in the installed transmitting/receiving device and determines that the coated signals are the same as each other.
The code signal is transmitted to the transceiver device built into the vehicle to lock or unlock the vehicle doors. Therefore, the oscillation means and modulation means do not operate except when transmission is necessary, so the power source is It becomes possible to provide an economical device with minimum consumption.

[Brief explanation of drawings]

Fig. 1 is a system block diagram showing a first embodiment of a wireless locking device for a vehicle according to the present invention, and Fig. 2 shows the operation of a delay circuit using a timer circuit and switches SWt' to SW of the embodiment. FIG. 3 is a system block diagram showing the second embodiment, and FIG. 4 is an explanatory diagram showing the coat signal transfer method of the second embodiment. 1 Door lock part 2 Key cart part 3.17
Code generation circuit 4.18 Oscillation circuit 5.19 Antenna 6.20
Modulation circuit 7 High frequency amplification circuit 8 Mixing circuit S Intermediate frequency amplification circuit 10.22 Detection circuit 11
．． 24 Code comparison circuit 12 Door lock mechanism 13 Actuator 14.2
5 DC power supply 15 Timer circuit 16.26 Transmission/reception switching circuit 21 Tuning circuit 23 Amplification circuit 30 Code storage circuit 31 Cable 32 Connector
40 Card part 41 Key plate 41a, 41
b Electrode 41C insulator 42 Kino Linda SW +~SW, Switch Fig. 2 T1 Time T0 Fig. 4 (b)

Claims (1)

[Scope of Claims] A wireless locking device that locks and unlocks a door of a vehicle via a wireless signal, which comprises a transmitting and receiving device built into a vehicle and a transmitting and receiving device provided separately from the vehicle, and which locks and unlocks a vehicle door via a wireless signal. The built-in transmitting/receiving device includes a code signal output means for outputting an arbitrarily set code signal, a code signal transmitting means for transmitting the code signal set by the code signal output means as radio waves from an antenna, and a code signal transmitting means for transmitting the code signal set by the code signal output means as radio waves from an antenna. a code signal receiving means for receiving the code signal via an antenna, and comparing and determining the code signal outputted from the code signal receiving means and the code signal set by the code signal outputting means, and when the code signals match. A code signal comparing means for outputting a locking/unlocking signal, and a door locking/unlocking means for locking or unlocking a door of the vehicle according to the locking/unlocking signal from the code signal comparing means, The transmitter/receiver installed in the transmitter/receiver includes: a code signal generating means that outputs a preset code signal; and a code signal detector that receives radio waves transmitted from the outside via an antenna and detects a code signal from the radio waves. means, code signal comparison means for comparing the code signal output from the code signal detection means with the code signal output from the code signal generation means and outputting a transmission signal when the code signals match; and the code signal comparison means. oscillation means that outputs a carrier signal only when a transmission signal from the means is input; code signal modulation means that modulates the code signal from the code signal generation means with a carrier wave from the oscillation means and transmits it from the antenna; A wireless vehicle locking device comprising: