JPS6344089A - Radio type door locking controller - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to locking and unlocking doors of vehicles and houses.
The present invention relates to a wireless door lock control device that wirelessly controls unlocking, and particularly relates to improvements to its transmitter.

[Conventional technology]

2. Description of the Related Art Conventionally, it is generally known that a door lock of a vehicle is locked/unlocked by issuing commands using radio waves without using a key.

Since the transmitter of such a wireless door lock control device is carried by the driver, it is desirable to make it as small as possible. Further, due to size constraints, a small battery must be used, and low power consumption is desirable in order to extend the service life.

[Problem that the invention seeks to solve]

In order to achieve the aforementioned objectives of small size and low power consumption, it is desirable to incorporate the electric circuit of the transmitter into an IC, and to make the IC a CMOS type IC with low power consumption. However, CMOS transistors generally operate slowly at low voltages. Due to the demand for miniaturization, the transmitter of a wireless door lock control device can only be equipped with a small and low-capacity power source, and furthermore, because of its function as a transmitter, it must handle high frequencies.

An object of the present invention is to provide a transmitter that uses a small and small-capacity power source and can generate high frequencies using a CMO3 type IC, in order to downsize the transmitter.

[Means for solving problems]

The configuration of the present invention is shown in FIG.

In order to achieve the above-mentioned object, the present invention includes a code signal generation section M1 that generates a predetermined code signal, a high frequency oscillation section M2 that oscillates a predetermined frequency, and an output of the high frequency oscillation section M2 that generates the code signal. A modulation section M3 that modulates according to a signal, a harmonic component resonance section M4 that resonates with a predetermined harmonic component of the oscillation frequency of the high frequency oscillation section, and a transmitting antenna M5 connected to this harmonic component resonance section. The technical means of providing a transmitter M6 is adopted.

[Effect]

The effects of the above-described configuration of the present invention will be explained.

The code signal generator M1 generates a predetermined code signal.

The high frequency oscillation section M2 oscillates a high frequency wave of a predetermined frequency, and its output is modulated by the modulation section M3 according to the code signal of the code signal generation section M1.

The output of the high frequency oscillator M2 modulated according to this code signal is input to the harmonic component resonator M4.

This harmonic component resonator M4 has a harmonic component element fi(
n-1 to 00), it is configured to resonate at a predetermined harmonic f, 4.

Since the transmitting antenna M5 is connected to this harmonic component resonator M4, the harmonic component resonator M4 resonates.
A harmonic component N is transmitted from this transmitting antenna M5.

〔Effect of the invention〕

In the present invention, a predetermined harmonic component of the output of the high frequency oscillation section is extracted and transmitted by the harmonic component resonance section.
The frequency handled by the high frequency oscillator can be made relatively low.

Therefore, the circuit elements constituting the high-frequency oscillation section do not need to have high-speed response.

Therefore, a part of this high frequency oscillation section is configured with a CMO3 type IC, and even if a low voltage battery is used, it can function as a transmitter of the wireless door lock control device. By configuring the transmitter of the wireless door lock control device with a CMO3 type IC, the transmitter can be made smaller and the battery life can be extended.

,-1 [Example] An example of the present invention is one in which the present invention is applied to a keyless entry system for a vehicle.

This locks and unlocks the vehicle's doors using radio signals without operating a lock mechanism installed on the door.

The transmitter is made small and lightweight and is carried by the owner or driver of the vehicle.

The receiver is mounted on the vehicle, and when it receives a signal from the transmitter, operates a door lock actuator to control locking and unlocking of the vehicle doors.

The transmitter stores a unique digital data signal and
The receiver operates the door lock actuator in response to only the data signal of a specific transmitter among the signals transmitted from a large number of transmitters.

The configuration of this embodiment will be explained below based on the drawings. Second
The figure is a block diagram of the transmitter 1 of this embodiment.

The transmitter 1 includes a transmission circuit centered on an IC 100, which is a one-chip monolithic CMO3 IC, which internally has a Kurofuku oscillation circuit 11, an identification code generation circuit 12, a power supply circuit 13, and a high frequency circuit 14, and a 3V lithium battery 15 serving as a power source.
It is composed of a transmitting switch 16 and a built-in small transmitting antenna 17.

FIG. 3 is a block diagram of the receiver 2 of this embodiment. The in-vehicle receiver 2 includes a receiving circuit 21 that receives and demodulates the radio waves transmitted from the transmitter 1, an identification code determination circuit 22 that determines whether the received code signal is from the intended transmitter, a power supply circuit 23, It is composed of an actuator drive circuit 24 that drives the door lock actuator 3 based on a signal from the determination circuit.

Next, the operation of the transmitter of this embodiment will be described.

When the transmission switch 16 is closed, the power supply circuit 13 is turned on, and the clock generation circuit 11, identification code generation circuit 12,
and the high frequency circuit 14 is activated. The high frequency circuit 14 is composed of two stages of inverter circuits, and the first stage inverter 141 has three CMO3ICs using a crystal oscillator 144.
It oscillates at a high frequency of 21MHz, which is a shortwave band that can be operated at. On the other hand, a digital code signal unique to this transmitter is generated based on data stored in a code generation circuit 12 in synchronization with a low-frequency clock signal oscillated by a clock oscillation circuit 11, and a digital code signal unique to this transmitter is generated by a variable capacitance diode 122.
Frequency modulates a 1 MHz high frequency (carrier wave). After this frequency-modulated high frequency is amplified by the second stage inverter 142, it is passed through a DC blocking capacitor 147 to a coil 148 and a 63M) Iz which is composed of a capacitor 149.
A third high frequency wave of 63 MHz is inputted to the resonant circuit and is emitted from the transmitting antenna 17 as a radio wave.

As mentioned above, by operating the high frequency circuit in the short wave band, it is possible to use a CMO8 digital IC even with a low rA voltage of 3V, including the clock oscillation circuit 11, identification code generation circuit 12, 11 circuit 13, etc. Since it is possible to realize a one-chip monolithic CMO3IC, it is effective in making transmitters ultra-small and reducing costs.

Furthermore, according to the present invention, if a CMO8XC that operates in an ultra-high frequency band is realized, it becomes possible to use an even higher frequency ultra-high frequency band.

FIG. 4 shows the configuration of a transmitter according to another embodiment of the present invention.

The high frequency circuit is composed of four inverters, and the inverter 201 oscillates a high frequency of 21 MHz using a crystal oscillator 205. This output is divided by the frequency divider circuit 11 to generate the reference clock necessary for the identification code generation circuit 12. creating a signal. Therefore, a more stable clock signal can be obtained than in the first embodiment.

Further, an open drain FET 209 for modulation is connected to the output of the identification code generation circuit 12, and a small capacitance modulation capacitor 210 is turned on.

By turning it off, the load capacitance of the crystal resonator 205 is changed, and the high frequency of 21 MHz is frequency-modulated.

On the other hand, the 21 MHz high frequency oscillated by the inverter 201 is input to the inverter 202 and amplified. At the same time, it is also amplified by the two stages of inverters 203 and 204. The two outputs are input to a 63 MHz resonant circuit composed of a capacitor 212 and a transformer 213.

This makes it possible to obtain an output approximately four times that of the first embodiment.

In the embodiments described above, the third harmonic is extracted as the output, but other harmonics may be used.

According to experiments conducted by the inventors, since the output of odd harmonic components is large, it is desirable to use other odd harmonics such as the 5th or 7th harmonics.

Furthermore, other modulation methods than frequency modulation, such as amplitude modulation and phase modulation, are also possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a block diagram of a transmitter of a vehicle keyless entry system which is an embodiment of the present invention, and FIG. 3 is a block diagram showing an embodiment of the present invention. FIG. 4 is a block diagram of a receiver of a vehicle keyless entry system, and FIG. 4 is a block diagram of a transmitter of a vehicle keyless entry system according to another embodiment of the present invention. Ml... code signal generation section, M2... high frequency oscillation section. M3...Modulation section, M4...Harmonic component resonance section, M5
...Transmission antenna, M6...Transmitter.

Claims (1)

[Scope of Claims] A code signal generation section that generates a predetermined code signal; a high frequency oscillation section that oscillates at a predetermined frequency; a modulation section that modulates the output of the high frequency oscillation section according to the code signal; A wireless door comprising: a transmitter including a harmonic component resonator that resonates with a predetermined harmonic component of the oscillation frequency of the high-frequency oscillator; and a transmitting antenna connected to the harmonic component resonator. Lock control device.