JP2008014095A - Keyless device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyless device for a vehicle capable of suppressing the electric consumption of the device and recognizing when an occupant having a portable machine approaches to the vehicle. <P>SOLUTION: When the portable machine 2 is judged to be stopped, the keyless device for the vehicle shifts to the electric power saving mode to continue the transmission of a detection signal instead of stopping the transmission of the detection signal, in an outside-the-car antenna. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of a vehicle keyless device that locks and unlocks a door of a vehicle according to the position of a portable device with respect to the vehicle.

As this type of technology, the technology described in Patent Document 1 is disclosed. In this publication, in a locking / unlocking device capable of locking / unlocking a door for a building by a portable device, when the locking / unlocking device receives a response code from the portable device continuously for a predetermined time, the locking / unlocking device is portable. The transmission of the call code to the machine is stopped.
JP 2004-3147 A

  In a vehicle keyless device that locks and unlocks a door of a vehicle, a mechanism is used in which the door is unlocked without operating the portable device when an occupant holding the portable device approaches the vehicle. Yes. However, when the locking / unlocking device (on-vehicle device) stops transmitting the calling code (search signal) to the portable device as in the above-described conventional technology, the occupant holding the portable device approaches the vehicle. However, there was a problem that the door could not be unlocked.

  The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is for a vehicle capable of suppressing power consumption and recognizing that an occupant holding a portable device approaches the vehicle. It is to provide a keyless device.

  To achieve the above object, in the present invention, a portable device having a search signal receiving means for receiving a search signal from an in-vehicle device, and a response signal transmitting means for transmitting a response signal to the search signal, and the position of the portable device A search signal transmitting means for transmitting a search signal for searching the vehicle, a response signal receiving means for receiving a response signal, a stop determining means for determining that the portable device is stopped from the response signal, and a portable device And an in-vehicle device having power saving mode shift means for shifting the search signal transmission means to the power saving mode when it is determined that the search signal transmission is stopped.

  Therefore, when the portable device moves and approaches the vehicle, it is possible to recognize that the portable device has approached, and thus it is possible to perform control such as unlocking the door or illuminating the feet with a light.

  Hereinafter, an embodiment for realizing a keyless device for a vehicle according to the present invention will be described based on a first embodiment.

  First, the configuration will be described.

  FIG. 1 is a block diagram of a vehicle keyless device according to a first embodiment. The keyless device 1 for a vehicle according to the first embodiment shown in FIG. 1 mainly includes a portable device 2 and an in-vehicle device 3.

[Portable machine]
The portable device 2 mainly includes a control unit 21, an RF transmission unit 22, a response signal transmission antenna 23, an LF reception unit 24, and a search signal reception coil 25.

  The response signal transmitting antenna 23 corresponds to the response signal transmitting means of the present invention, and the search signal receiving coil 25 corresponds to the search signal receiving means of the present invention.

  When receiving the search signal transmitted from the search signal transmitting antennas 45 to 49 of the in-vehicle device 3, the control unit 21 outputs a command signal to the RF transmission unit 22 so as to transmit a response signal. At this time, the ID code identified for each vehicle is stored, and when it is determined that the signal based on the search signal processed by the LF receiving unit 24 corresponds to the ID code of the own device, the ID code is transmitted to the RF transmitting unit. 22 to output. Further, it is determined whether the search signal is transmitted from any of the search signal transmission antennas 45 to 49 of the in-vehicle device, and the search signal transmission antenna information is also output to the RF transmission unit 22. Furthermore, the reception strength of the search signal is determined, and the strength information is also output to the RF transmitter 22.

  The RF transmission unit 22 converts the signal indicating the ID code, the search signal transmission antenna information, and the reception intensity information from the control unit 21 into a radio signal to be transmitted and outputs the signal to the response signal transmission antenna 23.

  The response signal transmission antenna 23 transmits the radio wave signal from the RF transmission unit 22.

  The LF receiving unit 24 converts the search signal from the search signal receiving coil 25 into a signal that can be processed by the control unit 21 and outputs the signal to the control unit 21.

  The search signal receiving coil 25 receives the search signal from the in-vehicle device 3 and sends the received radio wave signal to the LF receiver 24.

[In-vehicle device]
The in-vehicle device 3 includes a control unit 30, an LF transmission unit 31, an RF reception unit 32, an engine output unit 33, each door opening / closing input unit 34, a lock state input unit 35, a lock output unit 36, an unlock output unit 37, and an outside antenna. The output units 38 to 40, the vehicle interior antenna output units 41 to 42, the response signal receiving antenna 44, the vehicle exterior antennas 45 to 47, and the vehicle interior antennas 48 and 49 are mainly configured.

  The control unit 30 corresponds to the stop determination means and the power saving mode transition means of the present invention, the response signal receiving antenna 44 corresponds to the response signal receiving means of the present invention, and the outside antennas 45 to 47 correspond to the search signal transmitting means of the present invention. To do.

  The control unit 30 processes the input information from each door opening / closing input unit 34 and the lock state input unit 35 and the information from the portable device 2 input from the RF receiving unit 32 for transmission to the portable device 2. The output to the LF transmitter 31, the output to the lock output unit 36, and the output to the unlock output unit 37 are controlled.

  The LF transmitting unit 31 converts the search signal from the control unit 30 to search for a specific portable device 2 corresponding to the vehicle into a radio wave signal that can be transmitted, and outputs the outside antenna output units 38 to 40 and the inside antenna output units 41 to 41. Output to 42.

  The RF receiving unit 32 receives a radio signal indicating the ID code, direction information, and intensity information of the portable device 2 from the response signal receiving antenna 44, converts the signal into a signal that can be processed by the control unit 30, and outputs the signal.

  The engine output unit 33 outputs a command signal for starting an engine (not shown) according to a command from the control unit 30.

  Each door opening / closing input unit 34 inputs information on the opening / closing state of each door from the vehicle and outputs the information to the control unit 30.

  The lock state input unit 35 inputs information on the locked / unlocked state of the door lock of the vehicle from the vehicle and outputs the information to the control unit 30.

  The lock output unit 36 outputs a command signal for locking the door to a vehicle locking device (not shown) according to a command from the control unit 30.

  The unlock output unit 37 outputs a command signal for releasing the door lock to a vehicle locking device (not shown) according to a command from the control unit 30.

  The vehicle exterior antenna output units 38 to 40 output radio signals to the vehicle exterior antennas 45 to 47, and the vehicle exterior antennas 45 to 47 transmit the radio signals to the outside of the vehicle. The in-vehicle antenna output units 41 to 43 output radio signals to the in-vehicle antennas 48 and 49, and the in-vehicle antennas 48 and 49 transmit the radio signals to the inside of the vehicle.

  FIG. 2 is a diagram illustrating a search range of the portable device 2 based on search signals transmitted from the outside antennas 45 to 47 and the inside antennas 48 and 49. As shown in FIG. 2, the search range of the outside antenna 45 is a range A that is the right side surface direction of the vehicle. The search range of the outside antenna 46 is a range B which is the left side direction of the vehicle. The search range of the outside antenna 47 is a range C that is the vehicle rear side direction. The search range of the vehicle interior antenna 48 is a range D that is mainly in the front of the passenger compartment. The search range of the vehicle interior antenna 49 is a range E mainly at the rear of the passenger compartment.

  Next, the operation will be described.

[Outline of vehicle keyless device]
The vehicle keyless device 1 mainly has a door lock function and an engine start function.

  In the door lock function, when the driver with the portable device 2 gets off the vehicle and leaves the vehicle, the portable device 2 is outside the search range of the vehicle antennas 45 to 47 of the vehicle-mounted device 3 and the door is locked. On the other hand, when the driver approaches the vehicle to get on, the portable device 2 falls within the search range of the vehicle antennas 45 to 47 of the vehicle-mounted device 3 and the door is unlocked.

  The engine start function is such that when a driver with the portable device 2 is in the vehicle, the portable device 2 is within the search range of the in-vehicle antennas 48 and 49 of the in-vehicle device 3 and an engine start button (not shown) is operated. Starts. On the other hand, when the driver gets off and is out of the vehicle, the portable device 2 is outside the search range of the in-vehicle antennas 48 and 49 of the in-vehicle device 3, and the engine does not start even if the engine start button is operated.

[Power saving for in-vehicle devices]
The vehicle exterior antennas 45 to 47 and the vehicle interior antennas 48 and 49 adjust the search signal transmission output so that the portable device 2 within the respective search ranges can obtain a sufficient reception strength of the search signal. In order to unlock the door and illuminate the foot with a light without any special operation when the occupant holding the portable device 2 has just approached the vehicle, the antennas 45 to 47 outside the vehicle are used. Is set to a wide search range.

  For example, when an occupant holding the portable device 2 performs work near the vehicle, or when a bag containing the portable device 2 is left in the vicinity of the vehicle, that is, when the portable device 2 is stopped, It is considered that the passenger is not willing to get on the vehicle. In such a case, although it is not necessary to unlock the door or illuminate the foot with a light, the antennas 45 to 47 outside the vehicle perform transmission, which wastes power.

  Therefore, when the reception intensity at which the portable device 2 receives the search signal is constant, it may be determined that the portable device 2 is not moving, and transmission of the search signal from the outside antennas 45 to 47 is stopped. .

  FIG. 3 is a diagram illustrating a state in which transmission of the antennas 45 to 47 is stopped when it is determined that the portable device 2 is stopped. In FIG. 3, only the outside antenna 45 is shown for simplicity of explanation. FIG. 3A shows a state before stopping the transmission of the search signal of the outside antenna 45, and FIG. 3B shows the state after stopping the transmission of the search signal of the outside antenna 45.

  However, as shown in FIG. 3B, if the transmission of the search signal from the outside antennas 45 to 47 is stopped, the communication between the portable device 2 and the in-vehicle device 3 is interrupted. Therefore, even if the portable device 2 moves and approaches the vehicle, functions such as unlocking the door and illuminating the foot with a light without performing a special operation cannot be activated. .

  Therefore, in the first embodiment, when the portable device 2 is stopped, the transmission of the search signal from the outside antennas 45 to 47 is not completely stopped, but the search signal transmission cycle is lengthened. In other words, the in-vehicle device 3 is designed to save power by shifting to a power saving mode in which the transmission time is shortened or the transmission output is reduced.

[Vehicle keyless device control processing]
FIG. 4 is a flowchart illustrating a process flow in the control unit 30 of the in-vehicle device 3 according to the first embodiment.

  In step S <b> 1, it is determined whether or not the reception strength V is equal to or higher than the set strength Vt, based on the reception strength information included in the response signal transmitted by the portable device 2 and received by the portable device 2. If the received intensity V is greater than or equal to the set intensity Vt, the process proceeds to step S2, and if the received intensity V is less than the set intensity Vt, the process proceeds to step S10.

  In step S2, a command for setting Ta as the transmission cycle T of the search signal transmitted by the external transmission antennas 45 to 47 is output, and the process proceeds to step S3. This period Ta corresponds to a normal transmission period when transmitting a search signal. The period Ta is set from several tens [msec] to several hundreds [msec], and the other periods described later are also set to the same range.

  In step S3, it is determined whether or not the received signal displacement of the search signal receiving coil 25 is within Vx. If the displacement of the reception intensity is within Vx, it is determined that the portable device 2 is stopped and the process proceeds to step S4. On the other hand, when the displacement of the reception intensity is larger than Vx, it is determined that the portable device 2 is moving, and the process ends.

  In step S4, it is determined whether or not the time t during which the displacement of the received intensity is within Vx has passed ta. If the time ta has elapsed, the process proceeds to step S5. If the time ta has not elapsed, the process proceeds to step S3. This time ta corresponds to the first set time of the present invention.

  In step S5, a command for setting the transmission period T of the search signal transmitted by the external transmission antennas 45 to 47 to Tb is output, and the process proceeds to step S6. This period Tb is set to a period longer than the period Ta.

  In step S6, it is determined whether or not the received signal displacement of the search signal reception coil 25 is within Vx. If the displacement of the reception intensity is within Vx, it is determined that the portable device 2 is stopped and the process proceeds to step S7. On the other hand, when the displacement of the reception intensity is larger than Vx, it is determined that the portable device 2 is moving, and the process ends.

  In step S7, it is determined whether or not the time t during which the displacement of the received intensity is within Vx has passed tx. When the time tx has elapsed, the process proceeds to step S8, and when the time tb has not elapsed, the process proceeds to step S6. This time tx corresponds to the third set time of the present invention.

  In step S8, the transmission period of the vehicle exterior antennas 45 to 47 is lowered so that the search signal reception intensity of the search signal receiving coil 25 becomes zero. Moreover, the command which makes Tc the transmission cycle T of the search signal which the external transmission antennas 45-47 transmit is output, and it transfers to step S9. This period Tc is set to a period shorter than the period Tb.

  In step S9, a command for setting the transmission period T of the search signal transmitted by the external transmission antennas 45 to 47 to Td is output, and the process ends. This period Td is set to a period longer than the period Tc.

  In step S10, a command for setting the transmission period T of the search signal transmitted by the external transmission antennas 45 to 47 to Te is output, and the process proceeds to step S11. This period Te is set to a period longer than the period Ta.

  In step S11, it is determined whether or not the displacement of the reception intensity of the search signal of the portable device 2 is within Vx. If the displacement of the reception intensity is within Vx, it is determined that the portable device 2 is stopped and the process proceeds to step S12. On the other hand, when the displacement of the reception intensity is larger than Vx, it is determined that the portable device 2 is moving, and the process ends.

  In step S12, it is determined whether or not the time t during which the displacement of the received intensity is within Vx has passed ty. When the time ty has elapsed, the process proceeds to step S13, and when the time ty has not elapsed, the process proceeds to step S11.

  In step S13, the transmission period of the vehicle exterior antennas 45 to 47 is lowered so that the reception intensity of the search signal reception coil 25 search signal becomes zero. Moreover, the command which sets Tf as the transmission cycle T of the search signal transmitted from the external transmission antennas 45 to 47 is output, and the process proceeds to step S14. This period Tf is set to a period shorter than the period Te.

  In step S14, a command for setting the transmission period T of the search signal transmitted by the external transmission antennas 45 to 47 to Tg is output, and the process ends. This period Tg is set to a period longer than the period Tf.

[Control function for vehicle keyless device]
5 and 6 are time charts of each device of the vehicle keyless device 1. FIG. 5 shows a case where the search signal reception strength in the search signal receiving coil 25 is equal to or higher than the set strength Vt, and FIG. 6 shows a case where the search signal reception strength in the search signal receiving coil 25 is less than the set strength Vt.

  For example, as shown in FIG. 5, it is assumed that the transmission output P of the in-vehicle device 3 is Pa, the search signal reception intensity V in the search signal receiving coil 25 is Va (≧ Vt), and the transmission cycle T is Ta. .

  If the displacement of the search signal reception intensity V in the search signal receiving coil 25 is Va−Vx ≦ V ≦ Va + Vx, it is determined that the portable device 2 is stopped. At time t1 when the elapsed time when the portable device 2 is stopped becomes equal to or greater than ta, the transmission period T at which the vehicle-mounted antennas 45 to 47 transmit the search signal is set to Tb (> Ta).

  After the transmission cycle T is set to Tb, the transmission output P starts to decrease at time t2 when the time when the portable device 2 is stopped is longer than the time tb (time when the portable device 2 is stopped tx). At the same time, the transmission cycle T is set to Tc (<Tb).

  The transmission cycle T is set to Td (> Tc) at time t3 when the transmission output of the outside antennas 45 to 47 becomes Pb and the reception intensity V of the search signal of the search signal receiving coil 25 becomes substantially zero.

  Further, as shown in FIG. 6, it is assumed that the transmission output P of the vehicle-mounted device 3 is Pc, the search signal reception intensity V in the search signal receiving coil 25 is Vb (≦ Vt), and the transmission cycle T is Te. .

  At time t4 when the portable device 2 is stopped for time ty (= tc) or more, the transmission output P starts to decrease and the transmission cycle T is set to Tf (<Te).

  The transmission cycle T is set to Tg (> Tf) at time t5 when the search signal reception intensity V of the search signal receiving coil 25 becomes substantially zero.

  FIG. 7 is a diagram illustrating the operation of the search signal transmission output control of the vehicle exterior antennas 45 to 47 according to the first embodiment. In FIG. 7, only the outside antenna 45 is shown for the sake of simplicity. 7A shows a state before the search signal transmission output of the antenna 45 outside the vehicle is reduced, and FIG. 7B shows that the search signal reception intensity in the search signal receiving coil 25 of the portable device 2 is substantially zero. It is a figure which shows the mode at the time of reducing transmission output so that it may become.

  If the transmission output of the outside antenna 45 is reduced to reduce the search range A of the outside antenna 45 from the search range A (FIG. 7A) to the search range A1, the portable device 2 is outside the search range of the outside antenna 45. The second response signal transmission antenna 24 does not transmit a response signal. However, when the portable device 2 approaches the vehicle even a little, it enters the search range A1 of the outside antenna 45, so that the response signal transmitting antenna 24 of the portable device 2 can transmit a response signal. Therefore, it is possible to detect the movement of the portable device 2 (particularly movement in a direction approaching the vehicle) while suppressing the transmission output of the antenna 45 outside the vehicle.

  As described above, when it is determined that the portable device 2 is stopped, the vehicle-mounted antennas 45 to 47 do not stop the transmission of the search signal, but shift to the power saving mode and transmit the search signal. Will continue. Therefore, when the portable device 2 moves and approaches the vehicle, it is possible to recognize that the portable device 2 has approached, and therefore, it is possible to perform control such as unlocking the door or illuminating the foot with a light. it can.

  If the displacement of the search signal reception intensity V in the search signal receiving coil 25 is Va−Vx ≦ V ≦ Va + Vx, it is determined that the portable device 2 is stopped. Therefore, it is possible to determine that the portable device 2 is stopped without newly providing a device such as a person detection sensor. Therefore, it is possible to determine whether the portable device 2 is stopped, and it is possible to reduce the number of parts and man-hours.

  Further, when the elapsed time during which the portable device 2 is stopped becomes greater than or equal to ta, the transmission period T in which the outside antennas 45 to 47 transmit the search signal is set to the time before the elapsed time during which the portable device 2 is stopped becomes ta. The cycle Tb is set longer than the transmission cycle Ta. Therefore, by lengthening the transmission cycle, power saving of the in-vehicle device 3 can be achieved, and when the portable device 2 moves and approaches the vehicle, it is possible to recognize that the portable device 2 has approached. Become. Therefore, it is possible to perform control such as unlocking the door and illuminating the feet with a light.

  In addition, when the time during which the portable device 2 is stopped reaches the time tx (or ty) or more, the transmission output P is reduced so that the reception intensity at the search signal receiving coil 25 of the portable device 2 is substantially zero. .

  For this reason, when the portable device 2 approaches the vehicle as much as possible, the transmission output is set so as to fall within the search range of the outside antenna 45, and while the transmission output of the outside antenna 45 is suppressed, the movement of the portable device 2 (especially in the vehicle) It is possible to detect the movement in the approaching direction. Therefore, it is possible to perform control such as unlocking the door or illuminating the feet with a light.

  Further, when the time during which the portable device 2 is stopped becomes equal to or longer than the time tx (or ty), the transmission output P starts to decrease, and the transmission cycle T is set to be earlier than the transmission cycle before the transmission output P is decreased. Set to be short. Therefore, a decrease in the function of detecting the position of the portable device 2 by reducing the transmission output P can be suppressed by shortening the transmission cycle.

  Next, the effect will be described.

  (1) In the portable device 2, a search signal receiving coil 25 (search signal receiving means) for receiving a search signal from the in-vehicle device 3 and a response signal transmitting antenna 23 (response signal transmitting means) for transmitting a response signal to the search signal. Equipped with. In the in-vehicle device 3, the outside antennas 45 to 47 (search signal transmission means) for transmitting a search signal for searching the position of the portable device 2 to the outside of the vehicle, and the response signal receiving antenna 44 (response signal reception) for receiving the response signal. Means), a control unit 30 that determines that the portable device 2 is stopped based on the response signal, and a vehicle exterior antenna 45 to 47 (transmission of search signals) when it is determined that the portable device 2 is stopped. And a control unit 30 (power saving mode shifting means) for shifting the means) to the power saving mode.

  Therefore, when it is determined that the portable device 2 is stopped, the vehicle-mounted antennas 45 to 47 do not stop the search signal transmission, but shift to the power saving mode and continue the search signal transmission. Therefore, when the portable device 2 moves and approaches the vehicle, it is possible to recognize that the portable device 2 has approached, and therefore, control such as unlocking the door and illuminating the feet with a light can be performed. it can.

  (2) The response signal transmitting antenna 23 transmits information on the reception intensity at the time of receiving the search signal on the response signal. In addition, the control unit 30 determines that the portable device 2 is stopped when the change amount of the reception intensity is equal to or less than the set change amount.

  Therefore, it is possible to determine that the portable device 2 is stopped without newly providing a device such as a person detection sensor. Therefore, it is possible to determine whether the portable device 2 is stopped, and it is possible to reduce the number of parts and man-hours.

  (3) When the time during which it is determined that the portable device 2 is stopped passes the time ta (first set time), the control unit 30 sets the search signal transmission cycle to the transmission before the time ta elapses. I made it longer than the period.

  Therefore, by lengthening the transmission cycle, power saving of the in-vehicle device 3 can be achieved, and when the portable device 2 moves and approaches the vehicle, it is possible to recognize that the portable device 2 has approached. Become. Therefore, it is possible to perform control such as unlocking the door and illuminating the feet with a light.

  (4) When the time when it is determined that the portable device 2 is stopped passes the time tx (or time ty), the control unit 30 sends the search signal transmission output to the search signal receiving coil 25 of the portable device 2. The reception intensity of the search signal at is reduced until it becomes substantially zero.

  For this reason, when the portable device 2 approaches the vehicle as much as possible, the transmission output is set so as to fall within the search range of the outside antenna 45, and while the transmission output of the outside antenna 45 is suppressed, the movement of the portable device 2 (especially in the vehicle) It is possible to detect the movement in the approaching direction. Therefore, it is possible to perform control such as unlocking the door or illuminating the feet with a light.

  (5) When the control unit 30 reduces the transmission output of the search signal of the outside antennas 45 to 47, the transmission cycle of the search signal is made shorter than the transmission cycle before the transmission output is reduced.

  Therefore, a decrease in the function of detecting the position of the portable device 2 by reducing the transmission output P can be suppressed by shortening the transmission cycle.

(Other examples)
As mentioned above, although the keyless device for vehicles of the present invention has been described based on the first embodiment, the specific configuration is not limited to these embodiments, and the invention according to each claim of the claims. Design changes and additions are allowed without departing from the gist.

  For example, in the first embodiment, it is determined in step S4 of FIG. 4 whether or not the time t during which the displacement of the received intensity is within Vx has passed ta. When the time ta has elapsed, in step S5, a command for setting the transmission cycle T of the search signal transmitted by the external transmission antennas 45 to 47 to Tb longer than Ta is output. That is, power saving is achieved by increasing the transmission output of the search signal of the vehicle exterior antennas 45 to 47.

  This may shorten the transmission time of the search signal. Normally, when the portable device 2 exists in the search range of the outside antennas 45 to 47, the search signal reception coil 25 is set to have a longer transmission time for each search signal so that the search signal can be reliably received. In that case, the same information is transmitted several times. In the first embodiment, the transmission output of the search signal of the outside antennas 45 to 47 is made longer, but the transmission time may be made shorter.

  Specifically, in step S4 in FIG. 4, it is determined whether or not the time t during which the displacement of the received intensity is within Vx has passed ta. When the time ta has elapsed, a command is output so that the transmission time of the search signal transmitted by the external transmission antennas 45 to 47 is set to be shorter than the transmission time before step S3 in step S5. In this case, the time ta corresponds to the second time of the present invention.

  In addition to step S5, a transmission time change process may be performed instead of the period change process in steps S8 and S13.

  As a result, the following effects can be obtained.

  (6) By shortening the transmission time, power saving of the in-vehicle device 3 can be achieved, and when the portable device 2 moves and approaches the vehicle, it is possible to recognize that the portable device 2 has approached. It becomes. Therefore, it is possible to perform control such as unlocking the door and illuminating the feet with a light.

It is a block diagram of the keyless device for vehicles of Example 1. It is a figure explaining the search range of each search signal transmission antenna of Example 1. FIG. It is a figure which shows a mode when the vehicle interior antenna of Example 1 fails. It is a flowchart which shows the flow of a process in the control part of the vehicle equipment of Example 1. FIG. It is a time chart of each apparatus of the keyless apparatus for vehicles when the reception intensity | strength of the search signal in the search signal receiving coil of Example 1 is more than setting intensity. It is a time chart of each apparatus of the keyless apparatus for vehicles when the reception intensity | strength of the search signal in the search signal receiving coil of Example 1 is less than setting intensity | strength. It is a figure which shows the mode of the effect | action by the transmission output control of the search signal of the antenna outside a vehicle of Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle keyless apparatus 2 Portable machine 3 Car-mounted machine 23 Response signal transmission antenna 25 Search signal reception coil 30 Control part 44 Response signal reception antenna 45 Outside antenna

Claims (6)

A portable device having search signal receiving means for receiving a search signal from an in-vehicle device, and response signal transmitting means for transmitting a response signal to the search signal;
A search signal transmitting means for transmitting a search signal for searching the position of the portable device to the outside of the vehicle, a response signal receiving means for receiving the response signal, and determining that the portable device is stopped from the response signal. An in-vehicle device comprising: a stop determination unit; and a power saving mode transition unit that shifts the search signal transmission unit to a power saving mode when it is determined that the portable device is stopped;
A vehicle keyless device characterized by comprising: The keyless device for a vehicle according to claim 1,
The response signal transmission means is means for transmitting information on reception intensity at the time of receiving the search signal on the response signal,
The vehicle keyless device according to claim 1, wherein the stop determination unit is a unit that determines that the portable device is stopped when a change amount of the reception intensity is equal to or less than a set change amount. In the keyless device for vehicles according to claim 1 or 2,
When the time when the portable device is determined to be stopped passes the first set time, the power saving mode transition means sets the search signal transmission cycle to the time before the first set time has passed. A keyless device for a vehicle characterized in that it is longer than a transmission cycle. The keyless device for a vehicle according to any one of claims 1 to 3,
When the time when the portable device is determined to be stopped exceeds a second set time, the power saving mode transition means sets the search signal transmission time before the second set time elapses. A keyless device for a vehicle characterized by being shorter than a transmission time. The vehicle keyless device according to any one of claims 1 to 4,
The power saving mode transition means transmits the search signal transmission output when the time when the portable device is determined to be stopped exceeds a third set time, and the portable device transmits the response signal. The keyless device for a vehicle is characterized in that it is lowered until no more. The vehicle keyless device according to claim 5,
The power saving mode transition means, when reducing the transmission output of the search signal, makes the transmission cycle of the search signal shorter than the transmission cycle before the transmission output is reduced. .

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