JP2557129B2 - Car keyless entry system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention unlocks or locks a vehicle lock mechanism provided on a door, a trunk or the like by an airborne signal from a portable transmitter. The present invention relates to a keyless entry system for automobiles.

(Prior Art) For example, a keyless entry system for unlocking and locking a door lock is basically a portable transmitter for transmitting an airborne signal including a unique identification code, for example, a radio wave signal. , A receiving device that receives the radio signal to unlock and lock the door lock mechanism. In this case, the receiving device is provided on the automobile side so as to be able to drive the actuator for the door lock mechanism, and the identification code included in the received signal is received every time a radio signal from the portable transmitter is newly received. It is configured to compare with a registration code stored in advance in the memory circuit, and when the two match, the door lock mechanism is unlocked and locked alternately.

In this case, it is necessary to match the registration code stored in the storage circuit on the receiving device side with the identification code set on the portable transmitter side, and, for example, a configuration that enables unlocking / locking by multiple transmitters. In order to cope with the case where the transmitter is lost or the transmitter is lost, the registration code on the side of the receiving device needs to be configured to add or change it. Therefore, conventionally, in order to easily cope with such a request, the memory circuit is configured by an EEPROM, and a registration mode changeover switch is provided in the receiving device, and the radio signal from the transmitter is transmitted when the changeover switch is on. A function of storing the identification code included in the radio signal in the EEPROM as a registration mode when received is performed.

(Problems to be Solved by the Invention) This type of keyless entry system is generally set as an optional equipment, and is often attached to an automobile. In this case, since the receiving device is usually installed in a dead space of an automobile such as under a seat, it is inevitable that it is difficult to operate the registration mode changeover switch. However, if the registration mode changeover switch is provided on the dashboard, etc., an extra wire harness for routing the changeover switch is required, which is necessary in combination with the need for the registration mode changeover switch. There is a problem that increases the cost.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a floor where a registration code required for unlocking or locking an automobile door lock mechanism can be easily stored.
No extra parts are needed for the change operation,
Therefore, it is to provide a keyless entry system for automobiles that can reduce costs.

[Means for Solving the Problems] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a portable transmitter that transmits an airborne signal including a unique identification code, and a portable airborne signal in a received airborne signal. A keyless entry system for a vehicle, comprising a receiving device for unlocking or locking an automobile locking mechanism when an identification code matches a registration code previously stored in a memory circuit, wherein the receiving device is an ignition key. In addition to switching to the registration mode when the other existing automobile switch is turned on and off in the predetermined mode in the state, the identification code included in the reception signal when the airborne signal is received in the registration mode is stored in the storage circuit. The configuration is such that the registration mode is stored.

(Operation) When the ignition key is used and another existing automobile switch is turned on and off in a predetermined mode, the receiving device is switched to the registration mode. When an airborne signal is transmitted from the transmitter in such a state, the receiving device that receives the airborne signal will store the identification code included in the received signal as a registration code in the memory circuit. The circuit stores a registration code that matches the identification code set on the portable transmitter side. In this case, since switching to the registration mode as described above is performed using the existing automobile switch, it is not necessary to store the registration code, and an extra wire harness and switches are unnecessary. Therefore, the cost can be suppressed.

(Example) Hereinafter, one example of the present invention will be described with reference to the drawings.

In FIG. 1, a door lock mechanism 1 provided on a driver's side door of an automobile uses a DC motor 1a as an actuator for unlocking and locking, and a current in the direction of arrow A is supplied to the motor 1a. Unlocking action when
The lock operation is performed when a current in the direction opposite to the arrow A is supplied. The drive circuit 3 for supplying current from the vehicle-mounted battery 2 to the motor 1a includes two relays 4,5.
The current in the direction of arrow A is applied to the motor 1a when the first relay 4 is operated, and the current in the direction opposite to the arrow A is applied to the motor 1a when the second relay 5 is operated. Is connected to flow.

The receiving device 6 for selectively operating the relays 4 and 5 is connected so as to be supplied with power from the vehicle-mounted battery 2, and transmits the radio wave signal Sv transmitted from the portable transmitter 7 through the antenna 6a. It is configured to receive. The ignition switch 8 which is an existing automobile switch operated by an ignition key (not shown) is
It is arranged between the positive terminal of the battery 2 and the receiving device 6 so that the ON signal Sa is generated and given to the receiving device 6 in the ON state. The courtesy switch 9, which is an existing automobile switch that is turned on when the driver's side door is opened, is interposed between the ground terminal and the receiving device 6, and thus generates and receives the on signal Sb in the on state. It is configured to feed the device 6.

The portable transmitter 7 is formed in a shape that can be easily carried by an automobile driver, and has a unique identification code every time the transmission switch 7a provided on the surface thereof is turned on.
The transmission operation of the radio signal Sv including UC is performed.

Now, the receiving device 6 is configured to include a microcomputer, and particularly includes an EEPROM 6b which is a memory circuit for storing the registration code RC, and is schematically shown in FIG. 3 according to the reception of the radio wave signal Sv. The unlocking and locking operations as shown are executed.

That is, when the radio signal Sv is received, the radio signal
It is determined whether the identification code UC included in Sv matches the registration code RC stored in the EEPROM 6b. And both codes
If UC and RC do not match, return to the initial step,
When they match, it is determined whether or not the lock flag F is set (whether or not F = 1), and when the lock flag F is set (when the lock mechanism 1 is in the locked state as will be understood later). ), After operating the first relay 4 for a certain period of time, the lock flag F is set, and thereafter, the process returns to the initial step. As a result, the electric current in the direction of arrow A flows through the motor 1a for a certain period of time, whereby the lock mechanism 1 is unlocked.

If the lock flag F is not set when the identification code UC and the registration code RC match (that is, the lock mechanism 1 is in the unlocked state), the second relay 5
After operating for a certain time, remove the lock flag F,
After this, the process returns to the initial step. As a result, the electric current in the direction opposite to the arrow A flows through the motor 1a for a certain period of time, whereby the lock mechanism 1 is locked.

Further, the receiving device 6 is adapted to execute a registration mode constituted by an interrupt program as shown in FIG.

That is, in FIG. 2, in steps S1 to S7, whether or not the input is stopped within 10 seconds after the input of the ON signal Sa,
In other words, an operation is performed to determine whether or not an on / off operation has been performed in which the ignition switch 8 is once turned on and then turned off within 10 seconds. In step S6,
The ON flag QF is set so that the above steps S1 to S7 are not re-executed.

When the on / off operation of the ignition switch 8 in the predetermined mode as described above is performed (“YE
S "), the step S8 of lowering the on-flag QF is executed so that the steps S1 to S7 can be re-executed. Then
The number of times the ON signal Sb is input within the fixed time T ₁ is counted, and it is determined whether or not the counting result ΔN is, for example, “6” or more (routine S9, steps S10, S11). If the counting result ΔN is less than “6”, step
Returning to S1, when was "6" or more, when the on-off of the courtesy switch 9 by opening and closing the driver's door in other words is performed more than six times, the radio signal Sv within a predetermined time T ₂
Is received (steps S12, S13). At this time, if the radio signal Sv is not received, the process returns to the main program, but if the radio signal Sv is received, the identification code UC included in the received radio signal is EEPR.
The registration code RC is stored in the OM 6b (step A14), after which the unlocking or locking operation of the door lock mechanism 1 is executed (routine A15), and the process returns to the main program.

In short, the receiving device 6 has the ignition switch 8
If the courtesy switch 9 is turned on and off by opening and closing the driver's side door 6 times or more following the turning on and off within 10 seconds after turning on once, the registration code RC for the EEPROM 6b Is switched to a registration mode that allows the storage of a predetermined period of time T ₂ , and when the radio signal Sv is transmitted from the transmitter 7 in the state where the registration mode is switched in this way, it is included in the radio signal Sv. The identification code UC is stored in the EEPROM 6b as a registration code RC. At this time, the door lock mechanism 1
The unlocking operation or the locking operation is simultaneously performed, thereby notifying that the RC of the registration code has been stored.

Therefore, according to the configuration of the present embodiment described above, the switching to the registration mode for storing the registration code RC in the EEPROM 6b is performed using the existing ignition switch 8 and courtesy switch 9, so that the conventional configuration is used. As described above, there is no fear that the operation of storing the registration code RC will be difficult, and that an extra wire harness and switches will be required and the cost will increase. Further, when the registration code RC is stored, the fact is notified by the operation of the door lock mechanism 1. Therefore, it is not necessary to provide an extra notification device, and the cost can be suppressed also from this aspect. . Of course, since the switching to the registration mode is possible only by using the ignition key, there is no risk of deterioration of security.

Although the portable transmitter 7 transmits only one type of radio wave signal Sv in the above embodiment, the transmitter 7 is provided with a transmission switch for unlocking and a transmission switch for locking, and these transmissions are performed. In response to each ON operation of the switch, a radio signal including an unlocking identification code and a radio signal including a locking identification code are respectively transmitted, and at the receiving device 7, the radio signal It is also possible to adopt a configuration in which the corresponding unlocking operation and locking operation are selectively executed. Also, the ignition switch 8 is used as the switch for the existing automobile, but instead of this, the ACC
A switch may be used.

Besides, the present invention is not limited to the embodiments described above and shown in the drawings. For example, various modifications may be made without departing from the spirit of the invention, such as infrared rays or ultrasonic waves may be used as airborne signals from a transmitter. It is possible to

EFFECTS OF THE INVENTION According to the present invention, as is apparent from the above description, the identification code included in the airborne signal transmitted from the portable transmitter to the transmitter on the vehicle body side and the memory included in the receiver. A keyless entry system for a vehicle, wherein a lock mechanism for a vehicle is unlocked or locked when a registration code stored in advance in a circuit matches, a switch for an existing vehicle in which the registration code is stored in the memory circuit. Since the configuration is performed by utilizing the above, it is possible to easily perform the storage operation of the above registration code, and there is an excellent effect that it is possible to realize cost reduction by not requiring extra parts for the registration operation. Is.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an electric circuit diagram, and FIGS. 2 and 3 are flowcharts showing the control contents of the receiving apparatus. In the figure, 1 is a door lock mechanism, 3 is a drive circuit, 6 is a receiver, 6b is an EEPROM, 7 is a portable transmitter, 8 is an ignition switch (switch for existing automobiles), 9 is a courtesy switch (switch for existing automobiles). ) Is shown.

Claims (1)

(57) [Claims] 1. A portable transmitter for transmitting an aerial propagation signal including a unique identification code, and an identification code in the received signal provided in a storage circuit in advance so as to receive the aerial propagation signal on the vehicle body side. A receiving device for unlocking or locking the vehicle lock mechanism when the stored registration code matches, wherein the receiving device is another existing vehicle switch in a state where the ignition key is used. Is switched to a registration mode when turned on and off in a predetermined mode, and when the airborne signal is received in the registration mode, an identification code included in the received signal is stored in the storage circuit as a registration code. A keyless entry system for automobiles that is characterized by