JPH0634534Y2 - Keyless entry-device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a keyless entry device for controlling opening and closing of a door and a trunk of an automobile by using electromagnetic waves. It is intended to determine the target.

[Conventional technology]

In keyless entry systems that remotely control the opening and closing of car door locks and the opening of trunks, a unique identification code to identify the owner from the transmitter and a code that distinguishes between torlock operation and trunk operation have been conventionally specified. Are modulated and transmitted. A receiver attached to the vehicle receives and demodulates this radio wave and determines whether the recognition code matches the code of the vehicle. Only when the recognition codes match, the operation is performed according to the code that instructs the control content. For example, if the code indicating the control content is a trunk operation, the receiver outputs a signal to open the trunk lock to the actuator.

[Problems to be solved by the invention]

In the above-described system, it is usual that a transmitter is provided with a switch for operating the door lock mechanism and a switch for operating the trunk, and the operator selects and operates the switch to be controlled. However, selecting and operating a switch is cumbersome and causes an erroneous operation.

The present invention is intended to realize a system in which one switch is operated, the trunk lock is opened by pressing the switch near the trunk, and the lock mechanism of the door is operated by pressing the switch near the door. .

[Means for solving problems]

FIG. 1 is an explanatory view of the principle of the present invention, in which 1 is a vehicle body, 2 is a door,
3 is a trunk, 4 is a door antenna, 5 is a trunk antenna, 6 is a door control reception area centered on the antenna 4, and 7 is a trunk control reception area centered on the antenna 5. The antenna 4 is attached to a part of the door 2 (for example, a molding portion), and the antenna 5 is attached to, for example, a part of the rear bumper 8.

The transmitter is portable, and a single frequency carrier wave is transmitted by a single transmission button (switch) as described later. It has no code to distinguish between doors and trunks, only modulated system-specific identification (ID) codes. Car body 1
There is a receiver on the side, which has a function of demodulating the received radio waves to reproduce the recognition code and matching it with the own vehicle code, and whether the electric field strength of the received radio waves is larger or smaller than the preset value. It has a function to judge.

[Action]

The electric field strength of the radio wave decreases as shown in Fig. 1 (b) with respect to the distance from the antenna. Therefore, for example, only when the receiver connected to the antenna 4 or 5 senses a radio wave having a set electric field strength or higher. If the recognition code is demodulated, the antenna 4 serves as the receiving area 6 near the door 2 and the antenna 5 serves as the receiving area 7 at the rear of the trunk 3 as shown in FIG. It can be set not to intersect.

As a keyless entry system, when the receiver connected to the antenna 4 operates and the recognition code matches, the lock mechanism of the door 2 operates, and when the receiver connected to the antenna 5 indicates the recognition code matches, the trunk Since it suffices to perform the opening operation of 3, even if the operation of selecting and pressing the switch corresponding to the control content as in the conventional case is not necessary,
If the transmitter with a single switch is operated near the door, the door lock mechanism will open and close, and if the same operation is performed near the trunk, the trunk will be opened remotely.

It should be noted that the number of receivers may be one, as in the embodiment described below, without using two receivers. Also, light rays or infrared rays can be used instead of radio waves.

〔Example〕

2 to 4 are explanatory views of an embodiment of the present invention, and FIG. 2 is a configuration diagram of a transmitter. In the figure, 11 is a transmission switch, and when this switch is turned on, power is supplied to each unit. 12 is a battery that serves as this power source. Reference numeral 13 is a clock signal generator, the output of which is counted by the address counter 14. The output of the counter 14 becomes the address of the ROM (Read Only Memory) 15, and the ID code is sequentially read from the ROM 15. Reference numeral 16 is a modulator, which modulates the output of the carrier wave generator 17 with the ID code from the ROM 15 (for example, FSK). At this time, necessary synchronization bits and check bits are also added. Reference numeral 18 is an amplifier for amplifying the modulated carrier wave, and its output is transmitted from the antenna 19.

FIG. 3 is a block diagram of the receiver. This receiver is a relay 21
It is a method of switching the antennas 4 and 5, and 22 is its driver. The carrier wave (for example, 60 MHz) received by the antenna 4 or 5 is demodulated up to the baseband band through the high frequency amplifier 23, the frequency mixer 24, the intermediate frequency amplifier 25, and the demodulator 26. 27 is a local oscillator for frequency conversion. The demodulated output becomes the data input D of the microcomputer 29 through the waveform shaper 28 and the high pass filter (HPF) 30.
It is also used for electric field strength detection. Reference numeral 31 is an output switch of the HPF 30, which is driven in synchronization with the relay 21. The output of the switch 31 is switched to the RV1 side for the antenna 4 and to the RV2 side for the antenna 5. RV1 and RV2 are control distance adjusters for doors and trunks, which are the receiving areas 6 and 6 in FIG.
It is used to adjust the width of 7. 32 and 33 are rectifiers that detect the outputs of regulators RV1 and RV2, and each output is a microcomputer
29 SQ1 and SQ2 inputs. These SQ1 and SQ2 are at H (high) level when a radio wave having a level higher than that set by RV1 and RV2 arrives, and are at L (low) level below that.

The output of the microcomputer 29 is DOOR for door control,
There is a trunk control TRNK, a relay 21 and a switch 31 RY control RY, and an input has an input terminal ID of a comparison ID code (A) built in the ROM 34. FIG. 4 is a flow chart of the receiving operation executed by the microcomputer 29, and the ID code (A ') is that of the transmitting side taken from the D input. As is clear from the figure, both SQ1 and SQ2 are L
While the output RY is switched at a constant cycle during the period, the ID collation is performed when one of them becomes H, and if they match, the corresponding control output is sent to the actuator (not shown).

[Effect of device]

As described above, according to the present invention, if the receiving areas 6 and 7 shown in FIG. 1 (a) do not overlap, even a transmitter with a single transmission button can control the opening and closing of the door 2 and the trunk 3 separately. Therefore, the erroneous operation unlike the conventional method having a plurality of transmission buttons does not occur.

The single button transmitter is also used in Shokai Sho 62-88053,
In this system, a receiving circuit up to the detection stage is provided for each of the door and trunk antennas, and the outputs of both detection stages are compared to distinguish between the door and the trunk. In the present invention, the receiving circuit is one circuit common to each antenna, and the connection with the antenna is sequentially switched and the connection state is distinguished from the door or the trunk. Therefore, the configuration is simple and the cost is advantageous.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention, FIGS. 2 to 4 are explanatory views showing an embodiment of the present invention, and FIG. 2 is a block diagram of a transmitter,
FIG. 3 is a block diagram of the receiver, and FIG. 4 is a flowchart of the receiving operation. In the figure, 1 is a vehicle body, 2 is a door, 3 is a trunk, 4 is a door antenna, 5 is a trunk antenna, 6 is a door control reception area, 7 is a trunk control reception area, 11 is a transmission switch,
17 is a carrier wave generator, 29 is a microcomputer, RV1, RV
2 is a control distance adjuster.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Onishi 1st Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (56) References: 62-88053 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A keyless entry device for transmitting or receiving electromagnetic waves from a transmitter outside a vehicle to a receiver on the vehicle side to control opening or closing of a lock of a door or a trunk of the vehicle, by a single switch operation from the transmitter. An electromagnetic wave is sent, and on the receiver side, the door antenna provided in the vicinity of the door and the trunk antenna provided in the vicinity of the trunk are alternately switched to receive the electromagnetic wave by the same receiving circuit. The level is adjusted so that the receiving areas do not overlap, and only one of the door and the trunk is controlled according to the result of detecting a received signal of a predetermined level or higher and the switching state of the antenna at that time. A keyless entry device.