JP2009167638A - Keyless entry system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyless entry system for a vehicle, which enables a door for getting on and off the vehicle, desired by a user, to be locked/unlocked by a small number of operations of a radio portable key. <P>SOLUTION: A plurality of receivers are installed near the door for getting on and off the vehicle; it is determined which door for getting on and off the vehicle is positioned nearest to the user and which door for getting on and off the vehicle the user tries to operate (lock/unlock), by determining which receiver most strongly receives electric waves; and only the door for getting on and off the vehicle is actuated to be locked/unlocked. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a keyless entry system for a vehicle.

  2. Description of the Related Art Conventionally, a so-called keyless entry system that locks / unlocks (locks / unlocks) a door in response to an operation of a portable wireless portable key has been widely used in automobiles that are representative vehicles.

  There are various types of wireless portable keys, including a so-called two-button type in which buttons for locking and unlocking are separately provided, and a so-called one-button type in which locking / unlocking is performed with one button. In the case of the two-button type, all seats are simultaneously locked / unlocked according to the lock / unlock operation. Some destinations unlock only the driver's seat when the unlocking operation is performed once, and unlock all seats when the unlocking operation is performed again. In the case of the one-button type, all seats are unlocked when the driver's seat is locked, and all seats are locked when the driver's seat is unlocked.

  In some so-called smart keyless entry systems, when an outer handle (door knob) of a door is operated, the door is unlocked (see Patent Document 1).

JP 2000-352243 A

  In a normal keyless entry system that is not a smart keyless entry system, it is not possible to lock / unlock only an arbitrary door in either the two button type or the one button type. Therefore, if you unlock the right rear seat (all seats) to unlock, the child sitting on the left rear seat will open the door without permission, the door will touch the wall, etc. It can fall. Also, it is not desirable to unlock doors that are not necessary from the viewpoint of crime prevention.

  Also, in the case of the 1 button type, all the seats are locked / unlocked according to the locked / unlocked state of the driver's seat, so get off the driver's seat and go to the rear seat or passenger seat side to try to unload the children and luggage Then, in the next operation, all seats are locked, and it was necessary to perform the unlocking operation once more to enter the unlocked state.

  With the above problem as a background, an object of the present invention is to provide a vehicle keyless entry system capable of unlocking / locking a passenger door as desired by a user with few operations of a wireless portable key.

Means for Solving the Problems and Effects of the Invention

  A keyless entry system for a vehicle for solving the above problems is mounted on a vehicle and receives a radio signal transmitted from a wireless portable key, a locked state in which a vehicle door is closed and locked, Based on a door lock mechanism that operates to switch to an unlocked state that unlocks the entrance door, and a door lock control command that instructs locking / unlocking of the entrance door included in the radio signal, the door lock mechanism A keyless entry system for a vehicle comprising: a door lock control means for locking / unlocking, wherein a receiver is installed in the vicinity of the entry / exit door corresponding to the entry / exit door, and A door sensitivity control means comprising: a reception sensitivity detection means for detecting the reception sensitivity; and a door entry / exit selection means for selecting an entry / exit door for locking / unlocking based on the reception sensitivity of the radio signal. , And performs locking / unlocking of the door lock mechanism of the passenger door chosen.

  With the above configuration, in any of the two-button type and the one-button type, only an arbitrary door that the user wants to operate can be locked / unlocked.

  Moreover, the entrance / exit door selection means in the vehicle keyless entry system of the present invention is configured to select the entrance / exit door corresponding to the receiver having the highest radio signal reception sensitivity.

  In many cases, a user operates a wireless portable key near a passenger door to be operated. With the above configuration, if a receiver is installed for each entry / exit door, the user can specify the entry / exit door that the user wants to operate, and the door lock mechanism of only the entry / exit door is locked / unlocked, so the package is taken out. It is possible to ensure the convenience of being able to perform such operations, and it is possible to prevent a child sitting in another seat from opening the door without permission.

  In addition, the vehicle keyless entry system of the present invention is configured to include a boarding / alighting door selection suppressing unit that suppresses selection of a boarding / alighting door that performs locking / unlocking when a predetermined suppression condition is satisfied.

  With the above configuration, it is possible to lock / unlock a specific entry / exit door by a user's selection.

  Further, the keyless entry system for a vehicle according to the present invention is configured such that the receiver uses a predetermined control command from the wireless portable key as a suppression condition.

  With the above configuration, it is possible to select to lock / unlock a specific entry / exit door within the range of a keyless entry system of an existing vehicle without newly adding other means that is not a wireless portable key. it can.

  Further, the keyless entry system for a vehicle according to the present invention is configured such that the receiver uses a predetermined control command from a wireless portable key continuously for a predetermined time as a suppression condition. Is done.

  Receiving a predetermined control command continuously over a predetermined period of time keeps pressing a predetermined button of the wireless portable key beyond a predetermined period of time (so-called long press) ) Is possible. With the above configuration, it is possible to select locking / unlocking a specific entry / exit door while suppressing an increase in cost without changing the configuration of the wireless portable key.

  Further, the keyless entry system for a vehicle according to the present invention is configured such that the receiver receives a predetermined control command from the wireless portable key a plurality of times within a predetermined time as a suppression condition. .

  Receiving a predetermined control command from the wireless portable key a plurality of times within a predetermined period of time can be achieved by, for example, pressing the predetermined button of the wireless portable key twice (for example, double-clicking the mouse on a personal computer) Is possible). Also with the above configuration, it is possible to select locking / unlocking a specific entry / exit door while suppressing an increase in cost without changing the configuration of the wireless portable key.

  Further, the keyless entry system for a vehicle according to the present invention is configured so that the suppression condition is that the reception sensitivity of the radio signal falls below a predetermined reception sensitivity threshold.

  The low reception sensitivity of the wireless signal means that the wireless portable key is operated at a location relatively distant from the vehicle. The psychology of the user in this case is to lock / unlock any of the entry / exit doors rather than to lock / unlock a specific entry / exit door. Also with the above configuration, it is possible to select locking / unlocking a specific entry / exit door or other entrance doors while suppressing an increase in cost without changing the configuration of the wireless portable key.

  Further, the receiver in the keyless entry system for a vehicle according to the present invention includes a wheel side device including a pressure sensor that directly detects the tire pressure, and a wireless transmission unit that wirelessly transmits a signal of the detected tire pressure to the vehicle body side, And a vehicle body side device including a wireless receiving means for receiving a tire pressure signal transmitted wirelessly, the wireless receiving means in a tire pressure monitoring system for a vehicle is used. The

  In recent years, a tire pressure monitoring system that directly detects tire pressure of a vehicle such as an automobile and monitors the tire pressure is becoming widespread. For example, a radio signal including tire pressure information detected and transmitted from a tire pressure sensor installed in the tire of each wheel is received by a radio receiving antenna built in the wheel speed sensor used for detecting the rotational speed of the wheel. Therefore, the wireless receiving antenna is configured to be able to receive a wireless signal transmitted from the wireless portable key of the keyless entry system, and the signal from the wireless portable key can be transmitted over a wide range. A tire pressure monitoring system has been devised that can be received and that improves the usability of the keyless entry system (see Patent Document 2).

  Further, in a vehicle equipped with a tire pressure monitoring system and a keyless entry system, when the transmission unit of the tire pressure monitoring system transmits tire pressure information, the position of the wireless portable key of the keyless entry system is detected. An apparatus capable of specifying the position of a transmission unit provided on a tire has been devised (see Patent Document 3).

JP 2007-008206 A JP 2007-276642 A

  The configuration of Patent Document 2 aims to expand the radio wave reception range of the wireless portable key, and does not specify the position of the wireless portable key.

  Moreover, in the structure of patent document 3, it aims at specifying the position of the transmission unit provided in the tire. Since a means for detecting the position of the wireless portable key is separately provided and the wireless portable key is searched from the vehicle side, there is a problem that costs increase. Further, it is not intended to expand the range of radio wave reception by the wireless portable key.

  According to the configuration of the present invention described above, the configuration of Patent Document 2 or the configuration of Patent Document 3 and the configuration combining Patent Document 2 and Patent Document 3 are different from each other in cost reduction, simplification of assembly, and position of the wireless portable key. In addition, the entry / exit door that the user wants to operate can be specified, and the door lock mechanism of only the entry / exit door can be locked / unlocked.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a keyless entry system for vehicles (hereinafter abbreviated as a keyless entry system). The keyless entry system includes a wireless portable key 1 and a door lock / unlock control device (hereinafter abbreviated as a door lock ECU) 100.

  The wireless portable key 1 includes a lock button 1a for locking (locking) each door of the vehicle and an unlock button 1b for unlocking (unlocking). When the lock button 1a and the unlock button 1b are pressed, a lock command or unlock command for instructing the door lock ECU 100 to be locked or unlocked via a wireless communication unit (not shown) included in the wireless portable key 1 A command (control command) is transmitted by a radio signal. The wireless portable key 1 may be configured integrally with a normal mechanical key.

  The door lock ECU 100 includes radio communication units 6a to 6b (including antennas 14a to 14b), a door lock actuator (ACTR) 8 for a driver's seat, a door lock actuator 9 (9a to 9c) other than the driver's seat, and a driver's seat lock. The position switch 12, the lock position switches 13 (13a to 13c) for seats other than the driver's seat, and the control unit 4 to which these are connected are configured.

  The wireless communication units 6 a to 6 b are configured to be capable of wireless communication with the wireless portable key 1, and send the door lock control command received from the wireless portable key 1 to the control unit 4 via the antennas 14 a to 14 b.

  The control unit 4 is configured as microcomputer hardware in which a known CPU 4a, ROM 4b, RAM 4c, input / output unit (I / O) 4d, flash memory 4f, and the like are connected by an internal bus 4g. The CPU 4a repeatedly executes a control program (not shown) stored in the ROM 4b or the like every predetermined time, and outputs a control signal corresponding to the execution to the door lock actuator (8, 9) or the like. The control unit 4 corresponds to the door lock control means and the entry / exit door selection means of the present invention.

  The flash memory 4f retains stored contents even when power is not supplied to the control unit 4, and stores information necessary for the operation of the keyless entry system.

  The door lock actuators 8 and 9 are included in a known door lock mechanism, and lock / unlock the door lock mechanism of the corresponding seat door based on the control command of the control unit 4. In other words, the lock control signal sent from the control unit 4 operates to lock the door lock mechanism, and the unlock control signal sent from the control unit 4 operates to lock the door lock mechanism. To do.

  The lock position switches 12 and 13 are for detecting the state (lock / unlock) of the door lock mechanism of the corresponding seat and outputting it to the control unit 4. For example, if the switch is on, the lock position switches 12 and 13 are unlocked. If it is in the state or off state, it is in the locked state. The lock position switch 12 corresponds to the driver's seat door lock state detection means of the present invention.

  FIG. 2 shows a configuration in which the wireless communication units 6a to 6b are also used as wireless receiving means of a vehicle tire pressure monitoring system. In the example of FIG. 2, the wireless reception unit is configured integrally with the wheel side sensor, but may be configured separately from the wheel side sensor. The wireless communication units 6a to 6b correspond to the receiver and reception sensitivity detection means of the present invention.

  Each wheel 1a, 1b, 1c, 1d includes a rotary magnetic encoder 2a, 2b, 2c, 2d for detecting an ABS wheel rotational speed (hereinafter referred to as “wheel speed”) as a wheel side device. Tire pressure detection sensors 3a, 3b, 3c, and 3d for detecting the pressure of each tire are mounted. Here, the magnetic encoders 2a to 2d are attached to a hub bearing (not shown), and the tire pressure detection sensors 3a to 3d are attached to a rim surface (not shown) of the wheel. It is assumed that the hub bearing is also included in a part of the wheels 1a to 1d.

  Radio communication units 6a, 6b, 6c, and 6d are installed in wheel housings (not shown) in the vicinity of the wheels 1a to 1d in the vehicle body 5, respectively. These wireless communication units 6a to 6d include magnetic detection elements (not shown) for detecting magnetic pulses from the magnetic encoders 2a to 2d, which are wheel speed sensors, and tire pressure detection sensors 3a to 3d, respectively. Antennas 14a to 14d for receiving tire pressure radio signals are incorporated.

  Furthermore, the vehicle body 5 includes, as a vehicle body side device, an ABS control unit 17 that acquires wheel speed information from the magnetic encoders 2a to 2d and performs ABS control so that the slip ratios of the wheels 1a to 1d are constant. The tire pressure information detected by the tire pressure sensors 3a to 3d is acquired via the antennas 14a to 14d built in the wireless communication units 6a to 6d, and the tire pressures of the wheels 1a to 1d are monitored. A tire pressure monitoring unit 18 that controls the vehicle and a control unit 4 of a door lock ECU 100 that implements a keyless entry system that locks / unlocks the vehicle door by radio signals received by the antennas 14a to 14d.

  The ABS control performed by the ABS control unit 17 is based on the pseudo vehicle speed signal by, for example, extracting the fastest wheel speed from the wheel speeds detected by the magnetic encoders 2a to 2d and using it as a pseudo vehicle speed. By controlling the slip ratios of the wheels 1a to 1d to be the ideal slip ratio, the brake ratio is stably controlled while keeping the slip ratios of the wheels 1a to 1d constant. Such ABS control is a well-known technique and is not directly related to the present embodiment, so a detailed description thereof will be omitted.

  FIG. 3 is a block diagram showing functions of the tire pressure monitoring system. In FIG. 3, a wheel speed and tire pressure detection system for one wheel 1 is depicted for ease of explanation. That is, one wireless communication unit 6 is disposed on the vehicle body side corresponding to the magnetic encoder 2 and the tire air pressure detection sensor 3 provided on one wheel 1. The wireless communication unit 6 and the ABS control unit 17 are connected.

  Each tire air pressure detection sensor 3a to 3d (3 in FIG. 3) mounted on the tire of each wheel 1a to 1d includes a wireless transmission means 31, a wireless transmission antenna 32, and a piezo piezoelectric element 34 which is a pneumatic sensor. It is driven using a lithium battery 33. Then, the amount of deflection of the piezoelectric element 34 changes depending on the pressure value of the tire air pressure, thereby changing the generated voltage. The information on the change in the generated voltage is wirelessly transmitted at a predetermined timing, and high-frequency signals corresponding to the generated voltage are received by the antenna antennas 14a to 14d (wireless receiving means) incorporated in the wireless communication units 6a to 6d. . Then, by transferring to the tire pressure monitoring unit 18, the tire pressure monitoring unit 18 can monitor the tire pressure of each of the wheels 1a to 1d. Such tire pressure monitoring control is a well-known technique and is not directly related to the present embodiment, and therefore detailed description thereof is omitted.

  Further, the wireless data signal received by the wireless receiving antenna 14 is input to the ABS control unit 17, the tire pressure monitoring unit 18, and the control unit 4 via the well-known coupling circuit 15 and wireless IC 16.

  A door lock / unlock control process (hereinafter also abbreviated as a door lock control process) for controlling locking (locking) / unlocking (unlocking) of the entrance door will be described with reference to FIG. This process is included in a control program (not shown) stored in the ROM 4b or the like, and is repeatedly executed by the CPU 4a every other predetermined time together with other processes of the control program. First, it is checked whether or not a suppression condition for suppressing selection of the entrance / exit door to be locked / unlocked is satisfied. That is, the contents of the suppression condition satisfaction flag stored in the RAM 4c or the flash memory 4f are referred to.

When the suppression condition satisfaction flag is set and the suppression condition is satisfied (S11: Yes), the following normal lock / unlock control is performed (S21).
In the case of the one-button type, all seats are unlocked when the driver's seat is locked, and all seats are locked when the driver's seat is unlocked, based on the state of the lock position switch 12 of the driver's seat.
-In the case of the two-button type, control based on the pressed button (received control command) is performed.

  When the suppression condition satisfaction flag is cleared and the suppression condition is not satisfied (S11: No), the reception sensitivity information of each wireless reception unit (6a to 6d) is acquired (S12). The reception sensitivity is obtained, for example, by measuring the voltage level of the amplitude of the received radio signal and performing A / D conversion.

  Next, when the reception sensitivity of the driver's seat receiver (wireless reception unit 6b) is maximum from the acquired reception sensitivity information (S13: Yes), only the driver's seat is locked / unlocked (S17).

  Similarly, when the reception sensitivity of the passenger seat receiver (wireless receiver 6a) is maximum (S14: Yes), only the passenger seat is locked / unlocked (S18). When the reception sensitivity of the right rear seat receiver (wireless reception unit 6d) is maximum (S15: Yes), only the right rear seat is locked / unlocked (S19). When the reception sensitivity of the left rear seat receiver (wireless reception unit 6c) is maximum (S16: Yes), only the left rear seat is locked / unlocked (S20).

Next, processing for determining whether or not the suppression condition is satisfied will be described. This process is included in a control program (not shown) stored in the ROM 4b and is executed by the CPU 4a. The determination method uses any one or more of the following.
Whether the lock button 1a or the unlock button 1b has been pressed for a long time.
Whether or not the same button of the wireless portable key 1 has been operated a plurality of times (for example, twice) within a predetermined time.
Whether the lock button 1a and the unlock button 1b are composed of switches that can detect half-press and full-press, and whether or not these buttons are fully pressed.
Whether or not the wireless portable key 1 has been operated at a location more than a predetermined distance from the vehicle. That is, whether or not the reception sensitivity of the wireless reception units (6a to 6d) is lower than a predetermined reception sensitivity threshold value.

(Suppression condition establishment determination process 1)
A long press determination process for determining whether or not the button of the wireless portable key 1 is long pressed will be described with reference to FIGS. 5 and 7. With the wireless portable key 1, when a button is pressed, a control command corresponding to the pressed button is transmitted while the button is pressed. In addition, a predetermined number of control commands such as at least three times are transmitted at a predetermined interval T1 regardless of the length of time the button is pressed (see FIG. 6). . 5 and 6, “UL” indicates that the unlock button 1b has been pressed.

  First, when a transition is made from a state in which no control command is received from the wireless portable key 1 to a state in which a control command is received (S31: Yes), the control command counter stored in the RAM 4c is cleared (S32). Next, the received control command is acquired and stored in the RAM 4c (S33). Then, the control command counter is updated (incremented) (S34).

  When the value of the control command counter exceeds the predetermined value N1 (S35: Yes), it is determined that the suppression condition is satisfied, the suppression condition satisfaction flag stored in the RAM 4c is set, and the control command counter is cleared. (S36).

  On the other hand, if the value of the control command counter is less than the predetermined value N1 (S35: No), whether or not the control command is continuously received, that is, the radio wave from the wireless portable key 1 is continued. Check if it is received. If the control command is being continuously received (S37: Yes), the process returns to step S33, and the subsequent processing is executed.

  On the other hand, when the control command is not continuously received, that is, when the radio wave from the wireless portable key 1 is interrupted (S37: No), it is determined that the suppression condition is not satisfied, and the suppression stored in the RAM 4c. The condition satisfaction flag is cleared and the control command counter is cleared (S38).

  In addition to the method of determining the long press based on the number of control commands received continuously, the determination condition may be determined based on the time of continuous reception of control commands. As shown in FIG. 5, the reception time per control command is the data length of the control command + the transmission interval T1. Therefore, in FIG. 7, a timer may be used instead of the control command counter. That is, the timer is started in step S32 (the timer operates in the background). In step S35, when the timer value exceeds a predetermined value such as (data length + transmission interval T1) × N1, it is determined that the suppression condition is satisfied. The wireless portable key 1 may be configured to transmit a control command indicating a long press.

(Suppression condition establishment determination process 2)
The double-press determination process for determining whether or not the button of the wireless portable key 1 is pressed twice, which is one of the suppression condition establishment determination processes, will be described with reference to FIGS. First, when the control command is not received from the wireless portable key 1 (S51: No), the twice-pressed counter (simply represented as “counter” in FIG. 8) stored in the RAM 4c is updated (incremented) ( S57). The double push counter operates in the background. Then, when the control command is not received from the wireless portable key 1 and the control command is received (S51: Yes), the received control command is acquired, temporarily stored in the RAM 4c, and pressed twice. The counter is cleared (S52).

  Next, the control command received this time is compared with the previously received control command stored in the RAM 4c (S53). If they are different as a result of comparison (S54: No), the control command received last time is replaced with the control command received this time (S59).

  On the other hand, when the control command received this time is the same as the previously received control command stored in the RAM 4c (S54: Yes), the value of the twice-pressed counter is a predetermined value N2 (corresponding to a predetermined time) ) (S55: Yes), it is determined that the suppression condition is satisfied because it is pressed twice, the suppression condition satisfaction flag stored in the RAM 4c is set, and the twice-pressed counter is cleared (S56).

  On the other hand, when the value of the twice-pressed counter exceeds a predetermined value N2 (S55: No), it is determined that the suppression condition is not satisfied because it is not pressed twice, and the suppression condition establishment flag stored in the RAM 4c is cleared. Then, the twice-pressed counter is cleared (S58).

(Suppression condition establishment determination process 3)
A full press determination process for determining whether or not the button of the wireless portable key 1 is fully pressed will be described with reference to FIG. The precondition for this process is that the lock button 1a and the unlock button 1b are composed of switches that can detect half-press and full-press. First, when a radio wave from the wireless portable key 1 is received, a control command is acquired (S71).

  When the acquired control command indicates, for example, a state where the lock button 1a and the unlock button 1b are half-pressed (S72: Yes), it is determined that the suppression condition is not satisfied, and the suppression condition satisfaction flag stored in the RAM 4c is determined. Is cleared (S75).

  On the other hand, when the acquired control command does not indicate, for example, the half-pressed state of the lock button 1a and the unlock button 1b (S72: No) but indicates the fully-pressed state (S73: Yes), the suppression condition is It is determined that the condition is satisfied, and a suppression condition satisfaction flag stored in the RAM 4c is set (S74).

(Suppression condition establishment determination process 4)
The reception sensitivity determination process, which is one of the suppression condition establishment determination processes, will be described with reference to FIG. First, when a radio wave (that is, some control command) is received from the wireless portable key 1 (S91: Yes), information on radio wave reception sensitivity in each radio communication unit (6a to 6d) is acquired by the method described above. (S92).

  And in all the radio | wireless communication parts (it describes with "receiver" in FIG. 10), when receiving sensitivity is less than a predetermined receiving sensitivity threshold value (S93: Yes), it determines with the suppression conditions having been satisfied, and RAM4c The stored suppression condition satisfaction flag is set (S94). On the other hand, when the reception sensitivity of at least one wireless communication unit exceeds a predetermined reception sensitivity threshold value (S93: No), it is determined that the suppression condition is not satisfied, and the suppression condition establishment flag stored in the RAM 4c is cleared. (S95).

  In the above determination process, it may be determined that the suppression condition is satisfied when the reception sensitivity of at least one wireless communication unit is lower than a predetermined reception sensitivity threshold.

  Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these embodiments, and the knowledge of those skilled in the art can be used without departing from the spirit of the claims. Various modifications based on this are possible.

The figure which shows the structure of a keyless entry system. The figure which shows the example of attachment of a radio | wireless communication part. The figure which shows the connection structure of a keyless entry system and a tire pressure monitoring system. The flowchart explaining a door lock / unlock control process. The figure explaining long press determination processing. The figure explaining twice press determination processing. The flowchart explaining a long press determination process. The flowchart explaining twice press determination processing. The flowchart explaining a full press determination process. The flowchart explaining a receiving sensitivity determination process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wireless portable key 1a Lock button 1b Unlock button 3 (3a-3d) Air pressure sensor 6a-6b Wireless communication part (receiver, reception sensitivity detection means)
4. Control unit (door lock control means, entrance / exit door selection means)
8 Door lock actuator (driver's seat)
9 Door lock actuator (except driver's seat)
12 Lock position switch (driver's seat)
13 Lock position switch (except driver's seat)
18 Tire pressure monitoring unit 100 Door lock ECU

Claims (8)

A receiver mounted on a vehicle for receiving a radio signal transmitted from a wireless portable key;
A door lock mechanism that switches between a locked state for closing and locking the entry / exit door of the vehicle and an unlocked state for unlocking the entry / exit door;
A keyless entry of a vehicle, comprising: a door lock control means for locking / unlocking the door lock mechanism based on a door lock control command for instructing locking / unlocking of the entrance / exit door included in the wireless signal A system,
The receiver is installed in the vicinity of the entrance door corresponding to the entrance door,
Receiving sensitivity detecting means for detecting receiving sensitivity of the received radio signal;
A boarding / exiting door selecting means for selecting a boarding / exiting door for locking / unlocking based on the reception sensitivity of the radio signal,
The vehicle keyless entry system, wherein the door lock control means locks / unlocks a door lock mechanism of the selected entry / exit door.   2. The keyless entry system for a vehicle according to claim 1, wherein the entry / exit door selection unit selects an entry / exit door corresponding to the receiver having the highest reception sensitivity of the radio signal.   The keyless entry system for a vehicle according to claim 1 or 2, further comprising a boarding door selection restraining means for restraining selection of the boarding / alighting door that performs locking / unlocking when a predetermined restraint condition is satisfied.   The keyless entry system for a vehicle according to claim 3, wherein the suppression condition is that the receiver receives a predetermined control command from the wireless portable key.   The vehicle according to claim 3 or 4, wherein the suppression condition is that the receiver continuously receives a predetermined control command from the wireless portable key over a predetermined time. Keyless entry system.   6. The suppression condition according to claim 3, wherein the suppression condition is that the receiver receives a predetermined control command from the wireless portable key a plurality of times within a predetermined time. Vehicle keyless entry system.   The keyless entry system for a vehicle according to any one of claims 3 to 6, wherein the suppression condition is that the reception sensitivity of the wireless signal falls below a predetermined reception sensitivity threshold value. The receiver
A wheel-side device including a pressure sensor that directly detects tire pressure and a wireless transmission means that wirelessly transmits a signal of the detected tire pressure to the vehicle body side, and is disposed on the vehicle body side close to the wheel and transmitted wirelessly. A vehicle body side device including a wireless receiving means for receiving a tire pressure signal is used, and the wireless receiving means in a tire pressure monitoring system for a vehicle is used. Vehicle keyless entry system.

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