JPS6037380A - Keyless entry device for vehicles - Google Patents

Abstract

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

Description

TECHNICAL FIELD The present invention relates to a keyless entry device, and more particularly to an improvement in a keyless entry device that automatically locks and unlocks a door by receiving a code signal using weak radio waves from a transmitter. It is something.

BACKGROUND ART This type of keyless entry device can automatically lock and unlock a door without using a key by receiving a code signal using weak radio waves from a transmitter. By the way, when locking and unlocking the door by receiving a code signal using a weak radio wave, 1.1, ]-1: When the signal is received, the door is reliably locked and unlocked. There is a need to do. However, there is no way to determine whether the received I/O code signal is actually for unlocking the door or whether it is due to an erroneous operation, so it is natural that the door will be unlocked even if a code signal is received due to an erroneous operation. state. Therefore, there is an inconvenience that the locked state 'h°C is released even when the user does not intend to do so. For example, if we adopt a system in which the lock/unlock state is alternately reversed each time the transmission switch of the transmitter is pressed, as previously proposed by the applicant, Even if you press the button and think it is in the locked state, it is actually in the unlocked state, and there is a risk that you may leave the vehicle without noticing this.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problem, and its purpose is to detect when the state is unlocked by a code signal or changed to the unlocked state by the operation of a key or lock knob. An object of the present invention is to provide a keyless entry device that can prevent theft f1, etc. by automatically returning to a locked state after a certain period of time has elapsed.

114 Achievement of the Invention In order to achieve the above object, the present invention provides a keyless entry device that automatically locks and unlocks a door by receiving a code signal using weak radio waves from a transmitter. a locking mechanism that locks; an unlocking control section that controls the unlocked state of the lock all structure; and detecting when the locking mechanism is controlled to the unlocked state LQ by the unlocking control section. The present invention is characterized by comprising a [1-switch return control section] that returns the locking mechanism to the locked state after a predetermined period of time has elapsed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing an identifiable area, and FIG. 2 is a block diagram showing an embodiment of the present invention.

In the figure, reference numeral 10 denotes a portable transmitter, and by pressing the send (i) switch 12, a code signal on the right side of vehicle β1 is transmitted as a weak radio wave by FM, PCM modulation, etc.

Reference numeral 14 denotes a keyless engine 1 to 1] device mounted on the vehicle 15, which includes a receiver 16, a discrimination circuit 18, and a solenoid 20.
．． It has a door lock mechanism 22, a key lock mechanism 24, etc.

The receiver 16 receives the weak radio waves transmitted from the transmitter 10, amplifies and demodulates them, and reproduces a code signal.

The determination circuit 18 is configured with a microprocessor, for example, and determines whether the level electric field strength of the received code signal output from the receiver 16 is equal to or higher than a predetermined level, and determines whether the transmitter 10 is located within a predetermined radius from the receiver 16. It is determined whether or not the code signal is within the identification area 26 surrounded by the circle d, and it is also determined whether the code signal matches a code signal specific to the vehicle. The unlock control signal C8 is sent only when it matches the vehicle-specific code signal. Further, the discrimination circuit 18 is supplied with a parking signal PS from the parking brake 28 that indicates that parking is in progress, and receives a code signal from the receiver 16 only when this parking signal PS is on.
=I. Further, a timer circuit CO is connected to the discrimination circuit 18, and this timer circuit 30 starts measuring time from the time when the unlock control signal C8 is sent. When the timer circuit 30 times out after a predetermined period of time has elapsed, the discrimination circuit 18 A lock signal R8 is sent instead of the unlock control signal O8.

The solenoid 20 receives the unlock signal C from the discrimination circuit 18.
8 and lock signal R3 in opposite directions.

Door lock 1122 unlocks or locks the door depending on the energization state of solenoid 20.

The door lock mechanism 22 also has a key lock mechanism based on key operation.
A locking mechanism 24 unlocks and locks the door. In this case, when the door lock mechanism 22 is unlocked by the key lock 8m24, the actuator (not shown) of the solenoid 20 is moved, and the movement of the actuator at this time is determined by, for example, a change in the inductance of the coil that constitutes the solenoid. Alternatively, the detection signal DS is detected by the generation of back electromotive force, etc., and this detection signal DS is supplied to the discrimination circuit 18. Based on this, the timer circuit 30 is activated and starts measuring time, and when the timer circuit 30 times out after a predetermined period of time has elapsed, discrimination is made. A door lock signal R8 is supplied from the circuit 18 to the solenoid 20, and in response to this, the door lock 811f422 is activated to lock the door.

Next, I will explain the operation. The vehicle is stopped, the parking brake 28 is activated, and the parking signal PS is on,
Assuming that the door lock mechanism 22 is in the locked state, when the transmission switch 12 of the transmitter 10 is pressed in this state to transmit a weak radio wave representing a code signal, the code signal received by the receiver 16 is first transmitted. The determination circuit 18 determines whether or not the source is from within the identification area 26, depending on the electric field strength of the field. If the determination result is outside the identification area 26, the unlock control signal C8 is not output from the determination circuit 18 even if the temporary code signal matches the vehicle-specific code signal, and therefore the solenoid 20 is In the non-energized state, the door lock 81m22 maintains the door locked state. Further, if the determination result of the determination circuit 18 is that it is within the identification area 26, it is then determined whether the received code signal matches the vehicle-specific code signal, and when both match,
An unlock control signal O8 is output from the discrimination circuit 18,
This energizes the solenoid 20 and operates the door lock mechanism 22, thereby unlocking the door. This makes it possible to open the door. At the same time, the timer circuit 30 starts counting time, and after a predetermined time period sufficient to open the door from inside the identification area 26 has elapsed, the timer circuit 30 times out. Based on the time-up of the timer circuit 30, the discrimination circuit 18 is activated and a door lock control signal R8 is outputted. This door lock control signal R
8, the solenoid 20 is energized in the opposite manner to that described above, thereby returning the door lock I mechanism 22 to the door locking state. Therefore, the door cannot be opened from now on until the code signal from the transmitter 10 is received again.

Also, instead of transmitting the code signal from the transmitter 10,
The door can be opened by inserting a key into the key lock mechanism 24 to unlock the door lock mechanism 22. In this state, as the actuator of the solenoid 20 moves, the detection signal DS is supplied from the solenoid 20 to the discrimination circuit 18, and at the same time, the timer circuit 30 starts measuring time, and when the timer circuit 30 times out,
A door lock signal R8 is output from the discrimination circuit 18, and based on this, the solenoid 20 is energized and the door lock mechanism 2 is activated.
2 is activated and the door is returned to the locked state.

Furthermore, while the vehicle is running, the parking brake 28 is inactive, so the parking signal PS is off.
Therefore, the determination circuit 18 does not receive the code signal from the receiver 16, and prohibits the door lock IM 4iIJ22 from entering the unlocked state.

Effects of the Invention As described above, according to the present invention, the unlock control section (on the upper side, the discriminating circuit 18 and the key lock m lfa
24) activates the door lock mechanism to bring the door into the unlocked state, and after a predetermined period of time has elapsed from that point, the door lock mechanism is activated by the lock return control section (on the upper side, the timer circuit 30 and the discrimination circuit 18). The door lock mechanism is configured to return the door to the locked state, so even if a code signal is sent from the transmitter due to a false operation, the door will be unlocked for a while, but after a predetermined period of time has elapsed. Since the door automatically returns to the locked state, it prevents you from forgetting to lock the door, which helps prevent theft. Since the hat automatically returns to the locked state afterwards, it has an excellent effect of ensuring safety during driving.

Further, by accepting the code signal from the transmitter only within the identification area as shown above, it is possible to prevent the door from being inadvertently unlocked and to prevent the influence of other vehicle code signals.

Furthermore, if the reception of the code signal (t) is restricted by the parking signal from the parking brake as shown above, there is an advantage that it is possible to avoid unnecessary door unlocking due to transmission while driving. be.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an identifiable area according to the present invention, and FIG. 2 is a block diagram showing an embodiment of the present invention. 10... Transmitter, 14... Keyless entry device, 16...
Receiver, 18... Discrimination circuit, 20... Solenoid, 22... Door lock mechanism, 24... Key lock mechanism, 26... Identification area, 28... Parking brake, 30...・Timer circuit. Agent: Patent attorney ωlji Yoshikawa (1 other person) Figure 1

Claims (1)

[Claims] (1) Using weak radio waves from a transmitter] In a keyless entry device that automatically locks and unlocks a door by receiving a signal from a transmitter, there is a locking mechanism that locks and unlocks the door, and a locking mechanism that locks and unlocks the door. an unlock control unit that controls the locked state; and when the lock mechanism is controlled to the unlocked state by the lock control unit, detects this and returns the lock mechanism to the locked state after a predetermined period of time has elapsed. A keyless entry device comprising: a lock return control section.