JPH03235740A - Keyless entry system - Google Patents

Abstract

PURPOSE:To improve the theft preventing effect by installing a panic switch on a portable transmitter and prohibiting the lock release and engine operation by operating the panic switch, in the constitution in which an on-vehicle receiver receives the signal supplied from the portable transmitter and the door lock is released. CONSTITUTION:A portable transmitter 10 1s constituted of the first and second switches 11 and 12 and a luminous diode warning lamp 13, and when a driver gets on the automobile, the first switch 11 is turned ON, and the first code is transmitted. While, a receiver 20 is mounted on the automobile, and receives the code signal transmitted from the portable transmitter 10. When the receiver 20 receives the first code, a door lock actuator 31 is operated in the door lock state, and door lock is released by a CPU 30. In the anomaly state where a thief gets on the automobile simultaneously with the release of the door lock, the second switch (panic switch) 12 is turned ON, and the release of the door lock and the operation of an engine are prohibited.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a keyless entry system, and more particularly to a keyless entry system provided with effective anti-theft means against car thieves.

[Prior Art and Problems] Conventionally, keyless entry systems have been put into practical use that use infrared rays, ultrasonic waves, radio waves, or the like to lock or unlock a door without inserting a key into a keyhole.

This is equipped with a small transmitter containing a battery such as a button battery in the key itself (remote control key), which can transmit a certain code by pressing the button switch, and a sensor is installed near the car door or room lamp. Furthermore, a receiver is installed near the outer handle of the driver's door, and a CPU is installed near the dash board to receive the code signal, judge whether it is correct or not, and unlock the door only if it is correct.

FIG. 4 is a flowchart showing the operation of a conventional single-switch type transmitter compatible receiver (Japanese Patent Laid-Open No. 63-318
47).

As seen in FIG. 4, the starter circuit is cut off in conjunction with the lock operation. In other words, even if the codes match and the door opens, if the ignition key is locked, the starter circuit will be cut off, so even if a thief breaks the ignition key and tries to start the engine, the engine will not start.

Additionally, if the ignition key is not locked when the original owner leaves the vehicle, a warning light will be displayed to notify the owner.

However, if a car thief who was hiding outside the passenger seat or around the car enters the car at the same time as the door locks are unlocked (normally all doors are unlocked at the same time), or steals the transmitter. In such a case, the true owner of the car will have little power to fight back. Therefore, the inventors of the present invention provided a second switch, which is a panic switch, on the transmitter side, and by pressing this second switch the moment the true owner senses the above-mentioned panic state, an effective theft prevention measure can be taken. The present invention was developed with the idea of making it possible to do so.

[Objective of the Invention] The object of the present invention is to unlock the door lock when the true owner operates the transmitter from a distance from his/her own car.
To provide a keyless entry system with effective theft prevention means against car thieves who get into the car at the same time as the door is unlocked.

[Configuration of the Invention] According to the present invention, there is provided a keyless entry system in which a receiver provided in a vehicle receives a signal emitted in response to the operation of a first switch provided in a carrier transmitter to unlock a door, A second switch (panic switch) on the transportable transmitter
There is provided a keyless entry system characterized in that the keyless entry system is additionally provided with a control means that not only unlocks the door but also prohibits the operation of the engine by means of a signal issued in response to the operation of the second switch. Ru.

The present invention will be described in detail below using Examples.

FIG. 1 is a conceptual diagram of an embodiment of the present invention.

In FIG. 1, lO is a transmitter, 11 is a first switch,
12 is a second switch, 13 is an LED (light emitting diode warning light), 19 is a sensor, 20 is a receiver, 30 is a CPU
, 31 is a door lock actuator, and 32 is an engine starter switch.

FIGS. 2 and 3 are a transmitter-side flowchart and a receiver-side flowchart, respectively, of an embodiment of the present invention.

In Figure 2, if the second switch is not pressed first (
(normal state), check whether the first switch is ON or OFF, and if it is OFF, return; if it is ON, check whether the flag F=O. Normally, in the initial state, F=O, so the first switch
Send code and return. That is, each door is unlocked or locked. If F=1, the second code is transmitted and the process returns. If the second switch is turned on on the transmitter side, it will check whether F=0 and select YES (
In the case of F=O), it is reversed to FTE1, the LED lights up, and the system enters a panic state. Also, if No (F=1), F=0
Then, the LED turns off and turns. Note that in normal use, only the first switch is turned ON10FF, and the second switch is not turned ON10FF.

In Fig. 3, when the receiver receives the first code sent from the transmitter, it checks whether it is LOCK, and if it is locked, it returns L to unlock (UNLOCK), but if it is not locked, it returns to lock (LOCK). do. This is the same as a conventional keyless entry system.

Next, if the first code has not yet been received but the second code is received, first it is checked whether the flag F is O or 1.

Normally, F=0 in the initial state.

If F=O, set F=1 and enter a panic state.

Therefore, the IG relay (ignition relay) is cut, and the starter circuit is also cut, so the engine will not run in any case.

At this time, the horn may start sounding to alert people around you that the car has been stolen, and may continue to sound until the battery runs out.

Further, the power source of the electromagnetic pump for pumping fuel may be cut off, or in the case of a diesel engine, the fuel circuit may be cut off with an electromagnetic valve located before the injection pump.

In this way, the engine will not start at all even if you use the slope or try to tow or push it with another vehicle.

Also, if F=1 after receiving the second code, it is reversed to F=O,
The panic state is lifted.

That is, the TG relay is energized and the starter circuit is also energized, so the engine starts and the car can run.

This state is a return circuit that does not receive the first code, only receives the second code, and is limited to only when F=1. In all other cases, the IG relay is cut and the starter circuit is also cut, making theft extremely difficult.

[Effects of the Invention] By carrying out the present invention, all of the above objects of the invention can be achieved.

In other words, if the true owner operates the transmitter from a distance from the car to unlock the door, it will protect against a thief who gets into the car at the same time as the door is unlocked and tries to drive away. At the very least, it is possible to take effective anti-theft measures such as prohibiting the engine from operating.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram of an embodiment of the present invention, Fig. 2 is a flowchart on the transmitter side of the embodiment of the invention, Fig. 3 is a flowchart on the receiver side, and Fig. 4 is a conventional single switch type keyless entry system. This is a flowchart. 10 transmitter, 11 first switch, 12
2nd switch, 13 LED19 sensor,
20 Receiver, 30 - CPU0 No. 4 Kasumi No. 1 Figure jump 2 Concave sending 1 Otsu profit 10 Reflow na↑-To No. 1; Fraud 19170-Nayat

Claims (2)

[Claims] (1) In a keyless entry system in which a receiver installed in a vehicle receives a signal emitted in response to the operation of a first switch provided on a transportable transmitter and unlocks a door, the transportable transmitter A second switch (panic switch) is additionally installed, and a control means is provided which prohibits not only unlocking of the door but also operation of the engine by a signal issued in response to the operation of the second switch. Keyless entry system. (2) The keyless entry system according to claim 1, wherein the panic state is turned on and off by operating two switches, a first switch and a second switch.