JPH11280316A - Keyless entry device for car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock and release a door lock without conducting special operation for locking and release while preventing the unstable car-stop state of a car. SOLUTION: When the operation of an outside handle is detected by a hook switch 39, a fixing machine 31 transmits a request signal. A portable machine 11 receiving the request signal ciphers and transmits an identification code. The fixing machine 31 operates a door locking mechanism 4 when the identification code from the portable machine 11 and a borehand registered identification code coincide. When a user intends to get off under the state, in which an ignition switch 38 is not positioned at the place of LOCK, a buzzer 41 is rung while locking by the door locking mechanism 4 is disabled. Accordingly, when the user is separated from the car after door locking, the state of parking of the car can be ensured, and the feeling of security of the user can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyless entry device for a vehicle which can control a door lock of various vehicles such as an automobile without using a mechanical key.

[0002]

2. Description of the Related Art In recent years, without using a mechanical key plate,
Various keyless entry devices for vehicles that enable locking and unlocking by electronic and electric remote control have been proposed.

[0003] As a conventional keyless entry device for a vehicle, for example, a switch provided on a door side is operated as described in Japanese Patent Application Laid-Open Nos. 60-119873 and 2-22834. By doing
A request-response type keyless entry device is known in which a request signal is transmitted from a fixed device installed on a door side, and a portable device transmits an identification code in response to reception of the request signal.

A system for releasing a steering lock by an electric remote operation is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 3-1.
No. 48353, and the like.

[0005]

In the above-described request-response-type prior art, since the identification code is transmitted from the portable device in response to the request signal from the fixed device, there is no need to take the portable device out of a bag or the like. The door can be locked and unlocked with very few operations. However, in order to transmit the request signal from the fixed device, it is necessary to provide a certain trigger signal for requesting the fixed device to transmit the request signal. For this reason, in the prior art, a special switch for inputting a trigger signal is provided near the door. But,
If a special switch is provided on the door panel surface or the like, the structure becomes complicated and may be broken or damaged by others.

A keyless entry device for a vehicle is
This system enables unlocking of the door, permission of starting the engine, and the like by collating the identification code without using a mechanical key. Therefore, the user can get on and off the vehicle, start the engine, and the like without being conscious of the existence of the portable device (remote key), and can get off the vehicle without setting the shift lever to the parking position. . Since it is possible to get off without setting the shift lever to the parking position, there is a problem that the user after getting off cannot get a sense of security as to whether or not the stop state of the vehicle is safe.

In a typical system using a mechanical key,
From the standpoint of preventing runaway, the ignition switch can be turned to the LOCK position only when the shift lever is in the parking position, and the engine key can be removed and inserted only when the ignition switch is in the LOCK position. I have to. Therefore, a system using a mechanical key guarantees that the vehicle is always in a parking state if the user who gets off the vehicle holds the key. On the other hand, in the keyless entry device, regardless of the state of the shift lever and the ignition switch, the user can get off the vehicle while holding the portable device, so that the user cannot be given a sense of security and the usability is low.

[0008] Further, in the conventional technology of the request response type,
Since inductive electromagnetic waves are used to reduce power consumption and the like and bidirectional communication is performed via a loop antenna, it is difficult to perform stable bidirectional communication, and there is also a problem that the usability is not always good. That is, the radio wave reception state and the like vary greatly depending on the relationship between the orientation of the loop antenna of the portable device and the position of the loop antenna on the door side. You need to face it.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned various problems, and an object of the present invention is to enable easy locking / unlocking while maintaining high reliability and anti-theft property, and to improve the reliability when getting off the vehicle. It is an object of the present invention to provide a keyless entry device for a vehicle which can improve the safety of the vehicle.

[0010]

In order to solve the above-mentioned problems, a keyless entry device for a vehicle according to the present invention transmits a transmission request signal triggered by a steering operation and monitors a stop state of the vehicle. An alarm operation is performed.

According to the first aspect of the present invention, a portable device and a control device provided on the vehicle side are provided, and the identification code transmitted from the portable device is compared with an identification code registered in the control device in advance. A keyless entry device for a vehicle that outputs a predetermined control signal when the two identification codes match, wherein the portable device transmits an identification code in response to a transmission request signal, and the control device includes: A transmission request signal generating means for generating the transmission request signal and transmitting the transmission request signal to the portable device when a steering operation of the vehicle is detected; and an identification code transmitted from the portable device in response to the transmission request signal. Collating means for collating the vehicle with a pre-registered identification code; and a door state detecting a signal from a stop state detecting means for detecting whether or not the vehicle is in a safe stop state and an open / closed state of a vehicle door. Based on a signal from the detection means,
Monitoring means for monitoring whether or not the door has been opened in a state other than the safe stop state, and outputting the predetermined control signal when the identification codes match, and the monitoring means Control means for performing an alarm operation when it is determined that the door is opened in a state other than the safe stop state.

When the user gets on or off the vehicle, the user operates a door handle of the vehicle. By transmitting the transmission request signal from the control device by detecting the operation of the steering wheel, it is not necessary to provide a special trigger switch on the door surface or the like, and it is possible to prevent the special trigger switch from being broken or damaged due to mischief or the like. be able to. That is, in order to output a transmission request signal while saving power consumption,
It is necessary to input a trigger signal to the control device. If a special trigger switch is provided on the surface of the door panel for this purpose, the trigger switch itself may be broken or damaged. Therefore, in the present invention, the steering operation of the vehicle is detected and used as a trigger signal for the control device. In the case of a configuration in which the transmission request signal is constantly transmitted from the control device, such a trigger signal can be unnecessary, but the power consumption increases.

On the other hand, when the user opens the door at the time of getting off, the monitoring means determines whether or not the door has been opened with the vehicle in a safe stop state. When the door is opened in a state other than the safety stop state, an alarm operation is performed by the control means. As a result, it is possible to permit a normal exit while the vehicle is safely stopped, and it is possible to enhance the user's sense of security.

According to a second aspect of the present invention, a shift switch for detecting a position of a shift lever of the vehicle is used as the stop state detecting means. When the shift switch is in a parking position, the vehicle is in the safe stop state. It can also be determined that there is.

When the shift lever is at the parking position, the vehicle travel is restricted and the vehicle is in a safe stop state. Therefore, it is possible to easily monitor whether or not the vehicle is in the safe stop state by using the signal of the shift switch.

As in the invention according to claim 3, an alarm signal can be output as the alarm operation.

When the door is opened in a state other than the safety stop state of the vehicle, an alarm signal is output as an alarm operation.
Thus, the user who wants to get off can be warned in advance. As the alarm signal, for example, an operation signal of an alarm buzzer, a display output signal to a message display, or the like can be used.

As in the invention according to claim 4, the locking operation of the door can be further restricted as the alarm operation.

If the door is opened while the vehicle is in a state other than the safe stop state, the locking of the door is restricted to disable the door lock. Thus, when the user gets off the vehicle with the door locked, a safe stop state of the vehicle is guaranteed, and the user's sense of security can be enhanced.

According to a fifth aspect of the present invention, the control device transmits the locked state of the door as an operating state signal, and the portable device displays the locked state of the door based on the operating state signal. You can also.

Thus, the user can display the state of the door lock on the portable device and check it, thereby improving usability. Further, by combining with the invention according to claim 4, when the state of the door lock can be confirmed by the portable device, the safety stop state of the vehicle is also guaranteed at the same time, so that the sense of security of the user can be enhanced.

According to a sixth aspect of the present invention, the portable device transmits the identification code by a first transmission wave having weak directivity, and the transmission request signal is more directional than the first transmission wave. Can also be transmitted by a second transmission wave having a high intensity.

Here, as the "first transmission wave having weak directivity", for example, a radiated electromagnetic wave (RF signal) of about several hundred MHz can be used, and the "second transmission wave having strong directivity" can be used. For example, an induced electromagnetic wave of about several hundred KHz can be used. As a result, the effect of the posture of the portable device can be reduced and the usability can be improved.

Since a transmission wave having strong directivity (induced electromagnetic wave) is used as the transmission wave of the fixed machine, it is necessary to consider the attitude of the portable machine when receiving the transmission request signal. However, since the transmission wave (radiated electromagnetic wave) on the portable device side has weak directivity, when transmitting the identification code, the communication quality does not decrease so much due to the posture of the portable device. Therefore, the time required for maintaining the attitude of the portable device is shortened, and the usability is improved as compared with a case where a highly directional transmission wave (induced electromagnetic wave) is used for both transmission waves.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. First, FIG. 1 is an explanatory diagram illustrating an external configuration of a keyless entry device for a vehicle.

The door 2 of the vehicle 1 has a "vehicle handle"
Outside handle 3 is provided. A key cylinder (not shown) provided near the outside handle 3 is connected to a door lock mechanism 4 inside the door 2. In addition to the inside handle (not shown), a lock knob 5 protruding upward inside the door 2 is connected to the door lock mechanism 4.

The portable device 11 has, for example, a casing 12 made of a synthetic resin material or the like, a monitor switch 13 for confirming the operation state of the door lock mechanism 4, and lights up in response to the operation of the monitor switch 13. It is configured to include a display unit 14 such as an LED lamp and a control unit 15 described later with reference to FIG. The portable device 11 outputs a transmission code including an identification code in response to a request signal output using the operation of the outside handle 3 as a trigger. Here, the transmission code is, for example,
It is transmitted by a radiation electromagnetic wave of several hundred MHz, preferably about 300 MHz. In the following description, the radiated electromagnetic wave is represented by R
Expressed as an F signal. The configuration of the fixed machine 31 as a “control device” provided in the vehicle 1 will be described with reference to FIG.

FIG. 2 is a block diagram showing functions of the vehicle keyless entry device. First, the configuration of the portable device 11 will be described. As will be described later, the portable device 11 includes a control unit 15, a storage unit 16, and an induction electromagnetic wave (hereinafter, “LF”).
LF receiving section 17 for receiving a request signal transmitted as a "signal"), a trigger detecting section 18 for detecting a trigger in the request signal, a code detecting section 19 for detecting a rolling code or the like in the request signal, and a transmission section. An RF transmission unit 20 for transmitting the code as an RF signal;
The power supply 21 includes a power supply 21 such as a lithium battery and a power management unit 22 that manages power supplied from the power supply 21. The monitor switch 13 is shown only in FIG. 1 and is omitted in FIG.

The control unit 15 is embodied by, for example, a CPU or the like, and generates a transmission code in response to a request signal. As shown in FIG. 3A, the transmission code includes a trigger signal and an encrypted identification code (expressed as “ID code” in the figure).

Various methods can be used for encrypting the identification code. For example, it can be encrypted by rolling the identification code. That is, by performing bit rolling and word rolling on the identification code, the identification code is encrypted. Bit rolling refers to rolling an identification code in bit units. Word rolling refers to rolling an identification code in word units. The data is rearranged by these operations.

In the present embodiment, bit rolling is performed using a rolling code in the portable device 11, and then word rolling is performed using a rolling code from the fixed device 31. The encrypted identification code transmitted from the portable device 11 includes decryption data indicating how many bits of bit rolling have been executed. The data format of the transmission code is known on the fixed device 31 side. Therefore, the fixed machine 31 can extract the decryption data and decrypt the encrypted identification code.

The storage section 16 is composed of, for example, a RAM or the like, and stores therein at least an identification code, an operating state of the door lock mechanism 4, and encryption information. Here, the operation state of the door lock mechanism 4 is obtained by interpreting an operation state signal described later, and the extracted operation state is stored. The encryption information means information necessary for the encryption operation, and corresponds to, for example, the number of bit operations in bit rolling, the number of word operations in word rolling, and the like.

The LF receiving section 17 receives a request signal from the fixed device 31 by using an LF antenna 17A such as a loop antenna. FIG. 3 (B),
As shown in (C), the request signal and the operation state signal transmitted from the fixed machine 31 each include a trigger signal, an identification code, and a function code. The function code is composed of, for example, 4-bit data, and is used to indicate a rolling code for performing word rolling or an operation state of the door lock mechanism 4. When both the request signal and the operation state signal are indicated, they are expressed as “request signal or the like”.

The trigger signal included in the request signal and the like is detected by the trigger detecting section 18. This trigger signal is used as a wake-up request signal from the power saving mode, as described later. The identification code and the function code included in the request signal and the like are detected by the code detection unit 19, respectively.

The RF transmission section 20 transmits the transmission code input from the control section 15 as an RF signal from the antenna 20A. The power supply 21 is composed of, for example, a lithium battery and supplies power to each unit. The power management unit 22 manages the power supplied from the power supply 21. That is, in the reception standby state, it is sufficient to supply the minimum power required to receive the request signal from the fixed device 31. Therefore, in the reception standby state, the power saving that supplies the minimum power smaller than the normal supply power is performed. Mode, and when a trigger signal in the request signal is received,
This is for shifting from the power saving mode to the normal mode.

Next, the configuration of the fixed machine 31 will be described.
As described later, the fixed machine 31 as a “control device” includes a control unit 32 implemented by, for example, a CPU or the like.
And a request signal or the like to an antenna 3 such as a loop antenna.
The LF transmitting unit 33 includes an LF transmitting unit 33 that transmits from the 3A, an RF receiving unit that receives a transmitting code from the portable device 11 via the antenna 34A, a storage unit 35, and a timer 36.

The fixed machine 31 has a door switch 3 as "door state detecting means" for detecting the open / closed state of the door.
7, an ignition switch (IG-SW) 38 as "stop state detecting means", and an outside handle 3
, A shift switch 40 for detecting the position of the shift lever, and a buzzer 41 are connected. These switches are usually provided in advance on the vehicle body 1 side, and need not be provided in the fixed machine 31 itself. In the drawing, the switch is expressed as “SW”.

The ignition switch 38 includes a LOCK position for performing a steering lock, an OFF position for stopping the engine, an ACC position for permitting power supply to various accessory parts, an IGN position, and an ignition switch for starting the engine. Each position of ST position is provided. Here, in order to rotate the operation knob of the ignition switch 38 to the LOCK position, the shift lever must be in the parking position. Only when the shift position is the parking position, the control unit 32 activates a pin or the like for restricting the rotation operation, and locks the ignition switch 38.
This is because rotation operation to the position is permitted. Therefore, in the present embodiment, whether or not the vehicle is at the parking position can be detected based on the state of the shift switch 40 or the ignition switch 38. This is because the shift lever is in the parking position when the ignition switch 38 is in the LOCK position.

The state detecting switch 42, which can be grasped as operating state detecting means, detects the operating state of the door lock mechanism 4. Further, the ignition switch 38 is provided with a restart switch 43 for restarting the engine. The restart switch 43 is provided, for example, integrally with the operation knob of the ignition switch 38, and outputs a signal by pushing the operation knob.

The control unit 32 of the fixed machine 31 is a "control means".
A request signal shown in FIG. 3 is generated by the detection signal of the hook switch 39, and the request signal is transmitted to the portable device 11 as an LF signal. Further, the control unit 32 decodes the transmission code received as the RF signal from the portable device 11, compares the identification code in the transmission code with the identification code registered in the storage unit 35, and determines that the two identification codes match. If so, the door lock mechanism 4 is operated. Further, the control unit 32 monitors the vehicle stop state at the time of getting off, and when the door 2 is opened in a state other than the safety stop state, the control unit 32 sounds the buzzer 41 and prevents the door lock from being locked. Regulations.

Next, the operation of the present embodiment will be described with reference to FIGS. 4 to 6 show processing executed on the fixed machine 31 side. FIG. 4 is a flowchart showing a control process performed at the time of boarding.

In step (hereinafter abbreviated as "S") 1, it is monitored whether the detection signal of the hook switch 39 has been turned on, that is, whether the outside handle 3 has been lifted.

If the outside handle 3 has been lifted, the determination is "YES" and the flow shifts to S2 to transmit a request signal. That is, the control unit 32 receives the door opening operation by the outside handle 3 as a trigger input, and
The request signal shown in FIG.
To send from. Next, in S3, R
It waits for reception of the F signal. FIG. 4 shows that it is not possible to escape from the loop waiting for reception unless an RF signal is received. However, as can be easily imagined by those skilled in the art, detection of the ignition switch 38 and timeout of a predetermined time are performed. Thus, the RF signal reception standby state can be released.

When the portable device 11 transmits the transmission code in response to the request signal, in step S4, the portable device 11 interprets the transmission code and decrypts the encrypted identification code. That is, after performing the reverse word rolling operation by the rolling code in the request signal transmitted in S2, the reverse bit rolling operation is performed by the rolling code in the transmission code to extract the identification code registered in the portable device 11. .

In S5, the decrypted identification code is compared with the identification code registered in the storage unit 35, and it is determined whether or not both identification codes match. The case where the two identification codes do not match, the case where a different identification code is input, and the like. Therefore, S5 determines "NO" and ends the processing. On the other hand, if both identification codes match, "YE
S ", and then proceeds to S6. In S6, it is determined whether or not the hook switch 39 has been turned off. Once the outside handle 3 is returned to the reference position, "YES" is determined in S6, an unlock signal is output to the door lock mechanism 4 in S7, and the door is unlocked. In addition, the buzzer 41 is sounded in S7 to notify the completion of the unlocking operation.

As a result, since the authentication of the user has been completed, an engine start permission signal is output in S8 to permit the engine start. Therefore, the user can start the engine by rotating the ignition switch 38 to the ST position. Note that, for example, an engine start permission signal may be output to an engine control unit (ECU) to permit the engine start, or the operation of a relay inserted in the ignition system may be controlled by the engine start permission signal. .

Next, in S9, the operation state of the door lock mechanism 4 is detected based on the detection signal of the state detection switch 42, and the detected operation state is used as the operation state signal shown in FIG. To the device 11. Thereby, the current operation state is stored in the portable device 11. In S10,
Perform the waiting time for boarding time. In this riding time waiting process, for example, if the user does not open the door 2 within a predetermined time of about 20 seconds after unlocking the door 2, the lock is simulated as having no intention of riding and the door is locked again. As a result, it is possible to prevent the door lock mechanism 4 from being left in the unlocked state, and to maintain the fail-safe function.

Next, FIG. 5 is a flowchart showing a control process performed when the vehicle gets off. First, in S21, it is monitored whether the door 2 is opened based on the detection signal of the door switch 37. If the door 2 has been opened, the process proceeds to S22, where it is monitored whether or not the ignition switch 38 is at the LOCK position. When it is determined that the ignition switch 38 is not at the LOCK position, it means that the user intends to get off without putting the shift lever in the parking position. In S23, the buzzer 41 is sounded to call the user's attention. Although not shown in FIG. 5, the buzzer 41 is turned off when “YES” is determined in S22.
Operation can be stopped. Further, the buzzer 41 may be sounded for a predetermined time. As described above, when the door 2 is opened with the ignition switch 38 not in the LOCK position, the buzzer 41 sounds and the process does not proceed to S24 and thereafter. Therefore, put the shift lever in the parking position and set the ignition switch 38 to LO
Unless the user turns to the CK position, the user cannot lock the door 2.

When the ignition switch 38 is confirmed to be at the LOCK position in S22, the following locking process is performed. First, in S24, it is determined whether or not the hook switch 39 has been turned on, that is, whether or not the outside handle 3 has been lifted. If the outside handle 3 has been lifted, S24 determines “YES”, and a request signal is generated and transmitted to the portable device 11 in S25. It should be noted that the request signal may be generated when it becomes necessary, or may be generated in advance and stored in the storage unit 35 and read out when necessary.

In S26, the control waits for a transmission code returned from the portable device 11 in response to the request signal. As described above, the RF signal reception waiting state can be released by the operation of the ignition switch 38 or the like.

When the transmission code is received from the portable device 11, "YES" is determined in S26, and in S27, the decoding process is executed in the same manner as in S4. Next, S28 is
The identification code transmitted from the portable device 11 is compared with an identification code registered in advance, and if both identification codes match, “YES” is determined and the process proceeds to S29.

In step S29, the mode shifts to the auto lock mode in which the door 2 can be locked. Is determined.
Door 2 within a predetermined time after shifting to the auto lock mode
If does not close, the automatic lock mode is released and the process ends.

On the other hand, if the door 2 is closed within the predetermined time, a lock signal is output to the door lock mechanism 4 and the buzzer 41 sounds to notify the user that the door 2 is locked in S31. Then, in S32, an operation state signal indicating the current operation state is generated based on the detection signal of the state detection switch 42, and the operation state signal is transmitted to the portable device 11. Thereby, the portable device 11 updates and stores the operation state of the door lock mechanism 4.

Next, in S33, the timer 36 is started to start measuring a predetermined time, for example, about 2 seconds.
In S34, it is determined whether or not the hook switch 39 has been turned on, and in S35, it is determined whether or not the time has elapsed. When the determination is “NO” in S34, the process returns to S33, and when the determination is “NO” in S35, the process returns to S34. In other words, when the outside handle 3 is not operated for a predetermined time of about 2 seconds or more after the door 2 is locked, the present process ends, and returns to the normal reception standby state. . In other words, after locking,
The user can operate the outside handle 3 up and down to check the locked state.

Next, FIG. 6 is a flow chart showing the processing when the engine is restarted. The identification code is collated with the portable device 11 in the same manner as the above-described riding processing described with reference to FIG. To allow restart.

In S41, it is monitored whether or not the restart switch 43 has been operated. When the restart switch 43 has been operated, a request signal is generated and the LF transmission unit 3
3 (S42). Then, it waits for the reception of the RF signal from the portable device 11 (S43). When the transmission code from the portable device 11 is received, the identification code in the transmission code is decoded (S44). It is determined whether the identification code of the fixed machine 31 matches (S45). If the two identification codes do not match, the process ends. If the two identification codes match, an engine start permission signal is output (S46).

FIG. 7 is a flowchart showing a control process executed on the portable device 11 side in response to the request signal. First, when the trigger detection unit 18 detects a trigger signal included in the request signal, in S51, the mode shifts from the power saving mode to the normal power mode.

In other words, at all times, the mode is shifted to the power saving mode in order to keep the minimum functions necessary for detecting the reception of the request signal and to minimize the power consumption. To return to the normal mode.

In S52, it is determined whether or not the monitor switch 13 has been operated. When the monitor switch 13 is turned on, this is a case where the user wants to check the operation state of the door lock mechanism 4. Therefore, in S53, the display unit 14 is turned on in accordance with the operation state stored in the storage unit 16. Specifically, for example, the locking state is displayed by lighting the display unit 14 in red, and the display unit 1
By turning on 4 in green, the unlocked state can be displayed. However, the present invention is not limited to this, and when a single color light emitting element is used, the operating state of the door lock mechanism 4 can be notified by continuously lighting in the locked state and blinking in the unlocked state. . On the other hand, “NO” in S52
If it is determined, the display unit 14 is turned off in S54.

In S55, it is determined whether or not the LF signal has been received. If the LF signal has been received, the process proceeds to S56 to determine whether or not the signal is a request signal. If the request signal is a “transmission request signal”, a transmission code is generated in S57. That is, as described above, after performing the bit rolling by the rolling code in the portable device 11,
By performing word rolling using the rolling code in the request signal, the identification code is double-encrypted to generate a transmission code. This transmission code is S58
Is transmitted by an RF signal.

Then, in S59, a rolling code as encryption information in the portable device 11 is operated. Specifically, every time the transmission code is transmitted, the rolling code for performing the bit rolling is incremented by “3”. Next, in S60, it is determined whether or not all inputs have been turned off. It is determined whether or not all inputs such as the monitor switch 13 and the request signal have been turned off, that is, whether or not to shift to the power saving mode. In S60, "YE
If it is determined to be "S", the flow shifts to S61 to shift to the power saving mode.

Although the processing when the operation state signal is received is not specified, in this case, the function code is analyzed to extract the operation state, and the latest operation state is stored in the storage unit 1.
6 is stored. Further, the identification code in the request signal may be compared with the identification code on the portable device 11 side, and if the identification codes do not match, the request signal may be canceled.

According to the present embodiment configured as described above, the following effects can be obtained.

First, since the operation of the outside handle 3 is detected by the hook switch 39 and the request signal is transmitted from the fixed machine 31 by the operation of the outside handle 3, the overall structure can be simplified. Also, reliability and the like can be greatly improved.

That is, in the prior art in which a special switch is exposed on the surface of the door, such a special switch is likely to be noticeable, and may cause mischief to children and the like. However, in the present embodiment, since the detection signal of the hook switch 39 is used as a trigger input for request signal transmission, the appearance of a vehicle equipped with this device does not differ from the appearance of a normal vehicle at all, and calls attention of others. Since no mischief is caused and mischief is hardly induced, anti-theft property and reliability are improved.

Second, when the ignition switch 38 is
When in the CK position, it is determined that the vehicle is in the safe stop state, and when the door 2 is opened while the ignition switch 38 is in a position other than the LOCK position, the buzzer 41 is sounded to call attention. Therefore, it is possible to prevent the user from getting off without putting the shift lever in the parking position. Therefore, it is possible to prevent the user from leaving the vehicle while the stop state is unstable, and to increase the sense of security and improve the usability.

Third, when the ignition switch 38 is
When the vehicle is at a position other than the CK position, the door 2 cannot be locked. Therefore, whenever the user locks the door and leaves the vehicle, the ignition switch 38 is always turned on.
It can be guaranteed that it is in the LOCK position. Since the ignition switch 38 can be turned to the LOCK position when the shift lever is in the parking position, the vehicle is always parked when the door is locked and the vehicle is left. Therefore, it is possible to prevent the user from leaving the vehicle body in an unstable stop state. That is, when the user wants to lock the door 2, the user often leaves the vehicle body for a relatively long time. Therefore, by permitting the door lock when the ignition switch 38 is set to the LOCK position, the vehicle can be parked when the user is away from the vehicle body for a long time, and the sense of security can be enhanced.

Fourth, since the operation state of the door lock mechanism 4 is transmitted from the fixed device 31 to the portable device 11 and the operation state can be displayed on the display unit 14 of the portable device 11, the user returns to the vehicle. Without this, the operating state of the door lock mechanism 4 can be easily confirmed by the portable device 11 at hand. In addition, as described above, when the door is locked, the vehicle is in a parking state, so that a sense of security can be obtained without returning to the vehicle and visually checking the position of the shift lever. it can.

Fifth, since the signal from the portable device 11 is transmitted by a radiated electromagnetic wave (RF signal), and the signal from the fixed device 31 is transmitted by an induced electromagnetic wave (LF signal), the influence of the posture of the portable device is obtained. And the usability can be improved, and the battery life can be prolonged.
Here, a configuration in which an RF signal is also used for signal transmission of the fixed device 31 is also conceivable. In this case, although the degree of freedom of the posture of the portable device 11 is increased, if the portable device 11 receives the RF signal, the power consumption during standby greatly increases.
Battery life is shortened and usability deteriorates. In particular,
In the case of the configuration in which the portable device 11 receives the LF signal, the current consumption in the standby state is about several μA.

Sixth, when the outside handle 3 is not operated for more than a predetermined time of about 2 seconds, the system returns to the reception waiting state.
By operating the outside handle 3, locking can be confirmed. In other words, by adopting such a configuration,
In the present embodiment in which the operation of the outside handle 3 is used as a trigger for transmitting a request signal, locking confirmation by the user can be easily realized.

Seventh, since the portable device 11 is configured to encrypt and transmit the identification code by a rolling operation, it is possible to prevent unauthorized use of the identification code by another person and to improve the antitheft property. it can.

It should be noted that those skilled in the art can make various additions and changes without departing from the present invention, not limited to the above embodiments.

[0073]

As described above, according to the keyless entry device for a vehicle according to the present invention, a steering operation is used as a trigger for transmitting a transmission request signal, so that a difference in appearance is prevented. Can prevent mischief by others, and use a transmission wave with weak directivity, so that the degree of freedom of the possession state of the portable device is increased and the usability is improved.

When the vehicle is to be disembarked from a vehicle that is not in a safe stop state, a predetermined alarm operation is performed, so that the user can be alerted. Can be prevented, and usability is improved.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory diagram showing an external configuration of a vehicular keyless entry device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a functional configuration of a portable device and a fixed device.

FIG. 3 is an explanatory diagram showing a data structure of a transmission code, a request signal, and the like.

FIG. 4 is a flowchart showing a process at the time of boarding;

FIG. 5 is a flowchart showing a process at the time of getting off.

FIG. 6 is a flowchart showing a restart process.

FIG. 7 is a flowchart illustrating control processing on the portable device side.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 vehicle 2 door 3 outside handle 4 door lock mechanism 11 portable device 13 monitor switch 14 display unit 15 control unit 17 LF reception unit 20 RF transmission unit 21 power supply 22 power management unit 31 fixed unit 32 control unit 33 LF transmission unit 34 RF Receiving part 38 Ignition switch 39 Hook switch 41 Buzzer

Claims (6)

[Claims] An identification code transmitted from the portable device and an identification code registered in advance in the control device, wherein the identification codes match each other. A keyless entry device for a vehicle that outputs a predetermined control signal when the mobile device transmits an identification code in response to a transmission request signal. Transmission request signal generating means for generating the transmission request signal and transmitting the transmission request signal to the portable device when detected, an identification code transmitted from the portable device in response to the transmission request signal and an identification registered in advance Collation means for collating with a code, a signal from stop state detection means for detecting whether or not the vehicle is in a safe stop state, and a signal from door state detection means for detecting the open / closed state of a vehicle door Monitoring means for monitoring whether or not the door has been opened in a state other than the safety stop state, based on the, and outputs the predetermined control signal when the respective identification codes match, A keyless entry device for a vehicle, comprising: a control unit that performs an alarm operation when the monitoring unit determines that the door has been opened in a state other than the safe stop state. 2. A shift switch for detecting a position of a shift lever of the vehicle is used as the stop state detecting means.
2. The keyless entry device for a vehicle according to claim 1, wherein the safety stop state is determined when the shift switch is at a parking position. 3. The keyless entry device for a vehicle according to claim 2, wherein an alarm signal is output as the alarm operation. 4. The keyless entry device for a vehicle according to claim 3, wherein the locking operation of the door is further restricted as the alarm operation. 5. The vehicle according to claim 4, wherein the control device transmits the lock state of the door as an operation state signal, and the portable device displays the lock state of the door based on the operation state signal. Keyless entry device. 6. The portable device transmits the identification code by a first transmission wave having low directivity, and the transmission request signal is transmitted by a second transmission wave having higher directivity than the first transmission wave. The keyless entry device for a vehicle according to any one of claims 1 to 5, which is transmitted.