JP5950542B2 - In-vehicle communication system, in-vehicle communication device, and position determination method - Google Patents

In-vehicle communication system, in-vehicle communication device, and position determination method Download PDF

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JP5950542B2
JP5950542B2 JP2011244637A JP2011244637A JP5950542B2 JP 5950542 B2 JP5950542 B2 JP 5950542B2 JP 2011244637 A JP2011244637 A JP 2011244637A JP 2011244637 A JP2011244637 A JP 2011244637A JP 5950542 B2 JP5950542 B2 JP 5950542B2
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vehicle
transmission antenna
side
device
portable device
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JP2013100672A (en
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栗田 明
明 栗田
平 明徳
明徳 平
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三菱電機株式会社
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Description

  The present invention relates to an in-vehicle communication system, an in-vehicle communication device, and a position determination method.

  In response to an interrogation signal from an in-vehicle device such as an automobile, a portable device owned by the user returns an answer signal, and the in-vehicle device side checks the code stored in the answer signal to lock / lock the vehicle door. A smart entry system for unlocking has been put into practical use. A smart start system that enables a vehicle engine to start by collating codes with the same configuration has been put into practical use.

  In the smart entry system / smart start system, in order to reduce the possibility of vehicle theft due to unauthorized entry into the vehicle or unauthorized engine start operation, the position determination (in the following) (Referred to as inside / outside determination). For example, in Patent Documents 1 and 2 below, the vehicle-mounted device transmission antenna is installed in each of the vehicle interior and vehicle exterior areas, and then sequentially transmitted based on certain rules. A method for determining whether the vehicle is inside or outside by checking the presence or absence of the response on the vehicle-mounted device side is disclosed.

  In the inside / outside determination, a magnetic field signal in an LF (Low Frequency) band having a property of easily forming a communicable area in a desired area is transmitted from the in-vehicle device to the portable device. In general, a technique of transmitting radio waves in the UHF (Ultra High Frequency) band is used.

  However, the in-vehicle device transmission antenna corresponding to the LF band is a significant increase factor of the system cost. For this reason, in Patent Document 3 below, in order to reduce the number of in-vehicle device transmission antennas, each transmission antenna of the in-vehicle device is configured to have a multi-axis integrated configuration and a directivity control function. A method for realizing the improvement is disclosed.

JP 2004-84406 A JP 2005-76329 A JP 2011-127368 A

  In the case of using the methods described in Patent Documents 1 and 2, in order to realize in-vehicle / out-of-vehicle determination over the entire area considered in the smart entry system / smart start system, a plurality of in-vehicle and out-of-vehicle areas are provided. In-vehicle device transmission antennas need to be installed, and the total number of in-vehicle device transmission antennas is generally five or more in total. However, the methods described in Patent Documents 1 and 2 have a problem that the number of in-vehicle device transmission antennas cannot be reduced and it is difficult to reduce the system cost.

  On the other hand, in the method described in Patent Document 3, although the number of vehicle-mounted device transmission antennas can be reduced, each antenna needs to have a directivity control function. For this reason, there is a problem that the structure per antenna becomes complicated and costs increase, and it is difficult to drastically reduce the system cost.

  The present invention has been made in view of the above, and it is an object of the present invention to obtain an in-vehicle communication system, an in-vehicle communication device, and a position determination method capable of reducing the system cost by reducing the number of transmission antennas of the in-vehicle device. Objective.

In order to solve the above-described problems and achieve the object, the present invention provides an in-vehicle communication system including a portable device and an in-vehicle device that is mounted on a vehicle and determines an area where the portable device is present among a plurality of areas. The portable device includes a received signal strength detection unit that detects a received signal strength of a signal received from the onboard device, and a received signal strength feedback unit that transmits the received signal strength to the onboard device, The in-vehicle device includes a driver-seat in-vehicle transmission antenna installed in the vicinity of the driver seat in the vehicle, a passenger-seat in-vehicle transmission antenna installed in the vicinity of the passenger seat in the vehicle, and a trunk in the vehicle. A signal from among the three transmission antennas of the installed trunk-side in-vehicle transmission antenna, the driver-side in-vehicle transmission antenna, the passenger-side in-vehicle transmission antenna, and the trunk-side in-vehicle transmission antenna The transmission antenna selection unit that selects a transmission antenna to be used for transmission, and the transmission so that signals are transmitted in different time zones from the driver side vehicle interior transmission antenna, the passenger seat side vehicle interior transmission antenna, and the trunk side vehicle interior transmission antenna, respectively. a vehicle device controller for controlling the antenna selector, the determined intensity step corresponding to the received signal strength by the received signal strength for each of the transmit antennas received from the portable device, respectively compared with a predetermined threshold value, the two A position determination unit that determines an area where the portable device is present based on a combination of two or more intensity levels corresponding to the transmission antennas .

  According to the present invention, it is possible to reduce the system cost by reducing the number of transmission antennas of the in-vehicle device.

FIG. 1 is a diagram illustrating a functional configuration example of the in-vehicle device according to the first embodiment. FIG. 2 is a diagram illustrating a functional configuration example of the portable device according to the first embodiment. FIG. 3 is a diagram showing a concept relating to area classification inside and outside the vehicle according to the first embodiment. FIG. 4 is a diagram illustrating a configuration example of a frame format according to the first embodiment. FIG. 5 is a flowchart showing an example of an operation procedure of the in-vehicle device as the smart entry system. FIG. 6 is a diagram illustrating an example of in-vehicle / out-of-vehicle area division and an RSSI of each in-vehicle device transmission antenna in the in-vehicle / outside determination algorithm. FIG. 7 is a flowchart illustrating an example of a procedure of in-vehicle / outside determination processing according to the first embodiment. FIG. 8 is a flowchart illustrating an example of an operation procedure of the in-vehicle device as the smart start system. FIG. 9 is a diagram illustrating a functional configuration example of the vehicle-mounted device according to the second embodiment. FIG. 10 is a diagram illustrating a functional configuration example of the portable device according to the second embodiment. FIG. 11 is a diagram illustrating a configuration example of a frame format according to the second embodiment. FIG. 12 is a flowchart illustrating an example of an operation procedure of the in-vehicle device as the smart entry system according to the second embodiment. FIG. 13 is a flowchart illustrating an example of an operation procedure of the in-vehicle device as the smart start system according to the second embodiment.

  Hereinafter, embodiments of an in-vehicle communication system, an in-vehicle communication device, and a position determination method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a functional configuration example of a first embodiment of a vehicle-mounted device (vehicle-mounted communication device) in a vehicle-mounted communication system according to the present invention. FIG. 2 is a diagram illustrating a functional configuration example of the portable device in the in-vehicle communication system according to the present embodiment. The in-vehicle communication system according to the present embodiment is a so-called smart entry system, smart start system, or the like, and enables operation on a vehicle such as an automobile by a signal from a portable device. Hereinafter, an example in which the in-vehicle communication system according to the present embodiment has both a function as a smart entry system and a function as a smart start system will be described, but it may have either function. Further, the in-vehicle / outside determination processing and configuration of the present embodiment are not limited to the smart entry system and the smart start system, and can be applied to any system as long as the in-vehicle device performs a position determination processing related to the portable device. It is.

  As shown in FIG. 1, the in-vehicle device of the present embodiment includes a trigger operation detection unit 1, a door locking / unlocking unit 2, an engine start unit 3, an ECU (Electronic Control Unit) 4, a transmission unit 5, and a transmission antenna selection. Unit 6, driver side in-vehicle transmitting antenna 7, passenger seat side in-vehicle transmitting antenna 8, trunk side in-vehicle transmitting antenna 9, receiving antenna 10, and receiving unit 11.

  As shown in FIG. 2, the portable device of the present embodiment includes a CPU (Central Processing Unit) 21, a transmission unit 22, a transmission antenna 23, a reception antenna 24, and a reception unit 25.

  FIG. 3 is a diagram showing a concept related to area classification inside and outside the vehicle according to the present embodiment. A vehicle 100 is a vehicle equipped with the in-vehicle communication system of the present embodiment, and FIG. 3 shows an example of an automobile. As shown in FIG. 3, in the present embodiment, the areas inside and outside the vehicle are divided into an inside area 200, a nearby outside area 300, and a far outside area. The in-vehicle area 200 is an area in the vehicle 100 as shown in FIG. In the vicinity outside area 300, an area having a radius of about 80 to 100 cm is generally secured from the door. In the present embodiment, the near-vehicle outside area 300 is set as an area having a radius of about 80 to 100 cm, respectively, at three locations: a door on the driver's seat side, a door on the passenger seat side, and a trunk. The far vehicle outside area is an area outside the vehicle interior area 200 and outside the neighborhood vehicle exterior area 300.

  In the smart entry system, it is possible to lock / unlock the driver's seat, passenger's seat, and trunk door by signals from the portable device. At this time, the locking / unlocking operation is permitted only when it is determined that the portable device is present in the nearby vehicle exterior area 300. For example, when a user sleeps in the car while owning the portable device, the door is unlocked by the operation of another person from the outside. In such a case, the locking / unlocking operation is not performed.

  On the other hand, in the smart start system, engine start or the like is permitted only when it is determined that a portable device exists in the in-car area 100. For example, when a user purchases a drink from a vending machine or the like around the vehicle, in order to prevent a malicious person from getting into the vehicle 100 and starting and getting off the engine, The engine start is not permitted when the vehicle is present in the vicinity vehicle outside area 300 and the far vehicle outside area.

  If it is determined that the portable device is in an area outside the far vehicle, the operation is not considered for both the smart entry system / smart start system, and neither the door locking / unlocking operation nor the engine starting operation is performed. And

  As described above, the process for determining whether the portable device exists in the in-car area 200, the nearby car outside area 300, or the distant car outside area (car inside / outside judgment process) is extremely important for the smart entry system / smart start system. It is processing.

  Next, the function of each part of the vehicle-mounted device and portable device of the present embodiment will be described with reference to FIGS. The function of each part of the in-vehicle device shown in FIG. 1 will be described. The driver seat side in-vehicle transmission antenna 7, the passenger seat side in-vehicle transmission antenna 8, and the trunk side in-vehicle transmission antenna 9 are antennas for transmitting transmission signals. The driver's seat side in-vehicle transmitting antenna 7 is installed in an in-vehicle area near the driver's seat (for example, a door pillar portion on the driver's seat side or a wall surface portion of the door). The passenger seat side in-vehicle transmission antenna 8 is installed in an in-vehicle area in the vicinity of the passenger seat (for example, a door pillar portion on the passenger seat side or a wall surface portion of the door). The trunk-side in-vehicle transmission antenna 9 is installed in an in-vehicle area near the trunk (for example, a wall surface portion of the trunk door).

  The trigger operation detection unit 1 performs a trigger operation for locking / unlocking the door, such as a user holding his / her hand on the handle of the door or pressing a button installed on the side of the door, or a trigger operation for starting the engine. It detects and notifies the detected trigger to ECU4. At this time, the trigger operation detection unit 1 also specifies the position where the trigger operation is detected (for example, specifying that the hand is placed on the handle of the door on the driver's seat side) and notifies the ECU 4 of the specified position. Here, a function for detecting a trigger operation for door locking / unlocking (function as an entry trigger operation detection unit) and a function for detecting a trigger operation for engine start (as an engine trigger operation detection unit) In this example, the trigger operation detection unit 1 having both of the functions) is provided, but the trigger operation detection unit may be provided separately for door locking / unlocking and engine start.

  The ECU 4 is an in-vehicle device control unit that controls the operation of the entire in-vehicle device. The ECU 4 determines whether door locking / unlocking or engine start is possible based on the received data input from the receiving unit 11, and controls the door locking / unlocking unit 2 and the engine start unit 3. Further, the ECU 4 generates transmission data to the portable device and outputs it to the transmission unit 5.

  The ECU 4 includes a memory unit 41 and a threshold determination type in-vehicle / outside determination unit (position determination unit) 42. The memory unit 41 is a non-volatile storage unit for storing its own ID (IDentifier) code, encryption key, and the like. The threshold determination type in-vehicle / out-of-vehicle determination unit 42 uses a signal transmitted from each in-vehicle device transmission antenna (driver's side in-vehicle transmission antenna 7, passenger side in-vehicle transmission antenna 8, trunk side in-vehicle transmission antenna 9) in the portable device. By performing threshold determination processing based on the detected RSSI (Received Signal Strength Indication) information, the vehicle inside / outside determination is performed.

  The transmission unit 5 modulates the transmission data output from the ECU 4 to generate a transmission signal, and outputs the transmission signal to the transmission antenna selection unit 6. The transmission antenna selection unit 6 is an antenna that transmits signals based on an instruction from the ECU 4, among the three transmission antennas of the driver side vehicle interior transmission antenna 7, the passenger seat side vehicle interior transmission antenna 8, and the trunk side vehicle interior transmission antenna 9. Select.

  The reception antenna 10 is an antenna for receiving a reception signal, and outputs the reception signal to the reception unit 11. The receiving unit 11 demodulates the received signal to obtain received data, and outputs the received data to the ECU 4.

  The door locking / unlocking unit 2 performs the door locking / unlocking operation based on the inside / outside determination result for the portable device implemented in the ECU 4. The engine start unit 3 performs an engine start operation based on the in-vehicle / out-of-vehicle determination result for the portable device implemented in the ECU 4.

  The function of each part of the portable device shown in FIG. 2 will be described. The reception antenna 24 is an antenna for receiving a reception signal, and outputs the reception signal to the reception unit 25. The receiving unit 25 demodulates the received signal to obtain received data, and outputs the received data to the CPU 21. The receiving unit 25 includes an RSSI detecting unit 251. The RSSI detector 251 detects the RSSI of the received signal. The receiving unit 25 outputs the RSSI detected by the RSSI detecting unit 251 to the CPU 21.

  The CPU 21 is a portable device control unit that controls the operation of the entire portable device. The CPU 21 generates transmission data to the in-vehicle device and outputs it to the transmission unit 22. In addition, the CPU 21 includes a memory unit 211 and an RSSI feedback unit 212. The memory unit 211 is a nonvolatile storage unit for storing its own ID (IDentifier) code, encryption key, and the like. The RSSI feedback unit 212 outputs the RSSI information of the signal from each in-vehicle device transmission antenna detected by the RSSI detection unit 251 to the transmission unit 22 as transmission data.

  The transmission unit 22 modulates the transmission data output from the CPU 21 to generate a transmission signal, and outputs the transmission signal to the transmission antenna 23. The transmission antenna 23 transmits a transmission signal.

  FIG. 4 is a diagram illustrating a configuration example of a frame format of a frame transmitted by the in-vehicle device and the portable device according to the present embodiment. The first row of FIG. 4 shows (a) the frame format of the call signal transmitted from the in-vehicle device to the portable device. The frame of the call signal includes a preamble for frame synchronization, a fixed ID code composed of fixed-length ID information, a bit indicating that the frame is a call signal, and information such as a portable device number having the same ID. And an additional code including the parity bit (parity) for error detection.

  The second row of FIG. 4 shows (b) the frame format of the response signal transmitted as a response to the call signal from the portable device to the in-vehicle device. The response signal frame includes a preamble for frame synchronization, a fixed ID code consisting of fixed-length ID information, and information such as a bit indicating whether or not the call signal has been successfully received and a portable device number. It consists of a code and a parity bit for error detection.

The third row in FIG. 4 shows (c) the frame format of the interrogation signal transmitted from the in-vehicle device to the portable device. The frame of the interrogation signal includes a preamble for frame synchronization, a fixed ID code composed of fixed-length ID information, and information such as a bit indicating that the frame is an interrogation signal and a portable device number to be responded to Additional code, question code randomly generated based on random numbers each time, unmodulated carrier signal C A transmitted from the driver's side in-vehicle transmitting antenna 7, and unmodulated carrier transmitted from the passenger's side in-vehicle transmitting antenna 8 It is composed of a signal C B , an unmodulated carrier signal C C transmitted from the trunk-side in-vehicle transmitting antenna 9, and a parity bit for error detection.

The fourth row in FIG. 4 shows (d) the frame format of the answer signal transmitted as a response to the question signal from the portable device to the in-vehicle device. The response signal frame includes a preamble for frame synchronization, a fixed ID code including fixed-length ID information, and an additional code including information such as a bit indicating that the frame is a response signal and a portable device number. The response code, which is a ciphertext obtained by encrypting the received question code with the encryption key, the RSSI information RA of the signal received by the portable device from the driver side in-vehicle transmitting antenna 7, and the mobile phone from the passenger side in-vehicle transmitting antenna 8 and RSSI information R B signals machine has received the RSSI information R C of the signal the portable device has received from the trunk side vehicle-inside transmitting antenna 9, and a parity bit for error detection, in constructed.

  Note that the frame format in FIG. 4 is an example, and the same contents may be included, and the frame format is not limited to the frame format in FIG.

  Details of the operation in the present embodiment will be described below. First, the operation as a smart entry system of the in-vehicle communication system of the present embodiment will be described. FIG. 5 is a flowchart showing an example of an operation procedure of the in-vehicle device as the smart entry system. In the operation of the smart entry system, the in-vehicle device does not always transmit the calling signal of the portable device, but the transmission of the calling signal is triggered by the intention display timing when the user tries to lock / unlock the door. Is done.

  Examples of the trigger operation indicating that the door is required to be locked / unlocked include an operation in which the user holds his / her hand on the handle of the door or presses a button installed on the side of the door. Here, the detailed operation as the smart entry system after the vehicle-mounted device detects the trigger operation will be described.

  When the in-vehicle device detects the trigger operation, the in-vehicle device transmits a calling signal to the portable device (step S1). As the vehicle-mounted device transmitting antenna for transmitting the calling signal, any one of the driver-side in-vehicle transmitting antenna 7, the passenger-side in-vehicle transmitting antenna 8, and the trunk-side in-vehicle transmitting antenna 9 may be used. In this embodiment, transmission is performed from an in-vehicle device transmission antenna installed on a door that detects a trigger operation. For example, when the door handle held by the user or the button pressed by the user is for the driver's door, a call signal is transmitted from the driver's seat side transmission antenna 7. When the trigger operation corresponds to the trunk door, a call signal is transmitted from the trunk-side in-vehicle transmission antenna 9.

  The operation up to the transmission of the calling signal will be specifically described with reference to FIG. When the ECU 4 receives a notification that the trigger is detected from the trigger operation detection unit 1, the ECU 4 generates a call signal as transmission data, and passes the generated transmission data to the transmission unit 5. Moreover, ECU4 determines the vehicle equipment transmission antenna which transmits a calling signal based on the trigger detection position notified from the trigger operation | movement detection part 1, and selects the determined transmission antenna with respect to the transmission antenna selection part 4. Notify me. Based on the notification, the transmission antenna selection unit 4 selects one of the three in-vehicle device transmission antennas and transmits a call signal. By adopting such a configuration, it becomes possible to transmit a call signal from a vehicle-mounted device transmission antenna located closest to the portable device owned by the user, and the portable device can easily receive the call signal from the vehicle-mounted device. There is an advantage of becoming.

  Returning to the description of FIG. 5, when the portable device receives the calling signal from the in-vehicle device, the portable device generates and returns a response signal including its own portable device number stored in the memory unit 211 in the CPU 21. In the in-vehicle device, the ECU 4 determines whether or not the response signal has been received (step S2). Specifically, the ECU 4 determines whether or not the response signal received via the receiving antenna 10 and the receiving unit 11 is from a portable device having a portable device number corresponding to the calling signal transmitted in step S1. To do. If it is determined that the response signal has been received (step S2 Yes), the ECU 4 generates and transmits a question signal in the format shown in FIG. 4 in which the question code generated based on the random number is stored (step S3).

  The interrogation signal is basically transmitted from the vehicle-mounted device transmission antenna installed on the door where the trigger operation is detected in the same manner as the call signal. However, as shown in FIG. 4, the interrogation signal includes an unmodulated carrier signal transmitted from each in-vehicle device transmission antenna. Therefore, when transmitting the unmodulated carrier signal transmitted from each in-vehicle device transmission antenna, the ECU 4 transmits the unmodulated carrier signal from each in-vehicle device transmission antenna in the order shown in FIG. 6 is instructed to switch the antenna. By adopting such a configuration, the portable device can obtain RSSI information for all on-vehicle device transmission antennas regardless of the location of the portable device.

  The CPU 21 of the portable device performs an encryption process on the question code included in the received question signal using the encryption key stored in the memory unit 211, generates a response code, and stores the response code Is sent back via the transmission unit 22 and the transmission antenna 23. The RSSI detection unit 251 of the portable device detects RSSI information for each in-vehicle device transmission antenna based on the unmodulated carrier signal transmitted from each in-vehicle device transmission antenna included in the question signal. The RSSI feedback unit 212 of the CPU 21 stores RSSI information for each in-vehicle device transmission antenna in the above-described answer signal. In this way, the RSSI information corresponding to each in-vehicle device transmission antenna is fed back from the portable device to the in-vehicle device by an answer signal, so that the vehicle inside / outside determination processing is performed using the ECU 4 on the in-vehicle device side having high processing performance. Therefore, there is an advantage that it is not necessary to perform in-vehicle / out-of-vehicle determination processing on the portable device side that is particularly required to be downsized and reduce power consumption.

  The ECU 4 of the in-vehicle device determines whether or not the above-described response signal has been received and the authentication process has been correctly performed on the response code (authentication has been successful) (step S4). When the answer signal is received and the authentication process is correctly performed on the answer code (Yes in step S4), the threshold determination type in-vehicle / out-of-vehicle determination unit 42 sets the RSSI information for each in-vehicle device transmission antenna included in the answer signal as a threshold. To determine whether the vehicle is inside or outside the vehicle (step S5). Then, the ECU 4 determines whether the determination result of the vehicle interior / exterior determination is the vehicle interior area 200, the nearby vehicle exterior area 300, or the far vehicle exterior area vehicle interior / exterior determination (step S6), and the determination result is the neighborhood vehicle exterior area 300. In the case (step S6 near the outside of the vehicle), the door locking / unlocking unit 2 is controlled so as to perform the door locking or unlocking operation requested by the user, and the process is terminated (step S7).

  On the other hand, if it is determined in step S2 that a response signal has not been received (No in step S2), the process is terminated without performing the door locking or unlocking operation requested by the user (step S8). If it is determined in step S4 that the answer signal has not been received from the portable device or has not been correctly authenticated (No in step S4), the process proceeds to step S8. If it is determined in step S6 that the determination result is the in-vehicle area 200 or the distant vehicle outside area (step S6 in the vehicle or far vehicle outside), the process also proceeds to step S8.

  Here, an example of the in-vehicle / outside determination algorithm in the threshold determination type in-vehicle / outside determination unit 42 will be described with an example. This algorithm divides the inside / outside area of the vehicle into a plurality of areas and performs the determination process. FIG. 6 is a diagram illustrating an example of in-vehicle / out-of-vehicle area division and an RSSI of each in-vehicle device transmission antenna in the in-vehicle / outside determination algorithm.

  As shown in FIG. 6, here, the in-vehicle area 200 is divided into three areas: area A1 (driver's seat side in-car area), area A2 (passenger seat side in-car area), and area A3 (trunk side in-car area). . The neighborhood area 300 is divided into three areas: an area A4 (driver's seat side exterior area), an area A5 (passenger seat side exterior area), and an area A6 (trunk side exterior area). In this way, the area other than the far vehicle outside area is divided into a total of six areas A1 to A6. The table shown at the bottom of FIG. 6 shows an example of the RSSI magnitude relationship in each of the areas A1 to A6. In FIG. 6, ANT # 1 indicates the driver's seat side in-vehicle transmitting antenna 7, ANT # 2 indicates the passenger seat side in-vehicle transmitting antenna 8, and ANT # 3 indicates the trunk side in-vehicle transmitting antenna 9. The table of FIG. 6 shows the magnitude relationship of RSSI of signals transmitted from each on-vehicle device transmission antenna detected by the portable device when the portable device exists in each area.

  The tendency of which RSSI corresponding to which in-vehicle device transmission antenna becomes large and which RSSI corresponding to which in-vehicle device transmission antenna becomes small differs depending on the area where the portable device exists. Therefore, if an appropriate RSSI threshold value is set in advance based on the table of FIG. 6, it is possible to determine in which area the portable device is present by combining the threshold determination results for each RSSI. It becomes.

  For example, the RSSI of ANT # 1 becomes large and the RSSI of ANT # 2 becomes medium only in area A1. For this reason, when the RSSI of ANT # 1 is large and the RSSI of ANT # 2 is medium, it can be estimated that the portable device exists in the area A1. Similarly, the RSSI of ANT # 2 becomes large and the RSSI of ANT # 1 becomes medium only in area A2. Therefore, when the RSSI of ANT # 2 becomes large and the RSSI of ANT # 1 is medium, it can be estimated that the portable device exists in the area A2. Similarly, if the conditions for determining each area are extracted, the area where the portable device exists can be estimated.

  FIG. 7 is a flowchart showing an example of the procedure of the vehicle inside / outside determination processing according to the present embodiment. Here, on the premise of the RSSI magnitude relationship of FIG. 6, a threshold value for determining that the RSSI corresponding to ANT # 1 and ANT # 2 is large is defined as a threshold value A. In addition, a threshold value B for determining that the RSSI corresponding to ANT # 1 and ANT # 2 is medium or higher is set. That is, the RSSI corresponding to ANT # 1 and ANT # 2 is large when the threshold is A or more, and the RSSI corresponding to ANT # 1 and ANT # 2 is medium when the RSSI is less than the threshold A and greater than or equal to the threshold B. It is. Further, the threshold value for determining that the RSSI corresponding to ANT # 3 is large is the threshold value C, and the lower limit value for determining that the RSSI corresponding to ANT # 1 and ANT # 2 is small is the threshold value D. (That is, when the threshold value is less than the threshold value B and equal to or more than the threshold value D, the RSSI corresponding to ANT # 1 and ANT # 2 is small). Further, a threshold value for determining that the RSSI corresponding to ANT # 3 is medium or higher is defined as a threshold value E. The thresholds A to E are determined in advance by actually measuring RSSI when a portable device is present in each area so that the area where the portable device is present can be determined by the inside / outside determination process shown in FIG.

  As shown in FIG. 7, the threshold determination type in-vehicle / out-of-vehicle determination unit 42 first has RSSI from ANT # 1 (RSSI measured by a portable device by receiving a signal transmitted from ANT #) equal to or greater than threshold A. In addition, it is determined whether or not the RSSI from ANT # 2 is greater than or equal to the threshold B (step S11), and the RSSI from ANT # 1 is greater than or equal to the threshold A and the RSSI from ANT # 2 is greater than or equal to the threshold B (Step S11 Yes), it determines with in-vehicle area 200 (area A1), and complete | finishes a process (step S12).

  If the RSSI from ANT # 1 is not greater than or equal to the threshold A or the RSSI from ANT # 2 is not greater than or equal to the threshold B (No in step S11), the RSSI from ANT # 1 is greater than or equal to the threshold B and the RSSI from ANT # 2. Is greater than or equal to the threshold A (step S13). If the RSSI from ANT # 1 is greater than or equal to the threshold B and the RSSI from ANT # 2 is greater than or equal to the threshold A (Yes in step S13), it is determined that the in-car area 200 (area A2) and the process ends (step S14). ).

  If the RSSI from ANT # 1 is not greater than or equal to the threshold B or the RSSI from ANT # 2 is not greater than or equal to the threshold A (No in step S13), the RSSI from ANT # 3 is greater than or equal to the threshold C and the RSSI from ANT # 1. Is greater than or equal to threshold B and whether RSSI from ANT # 2 is greater than or equal to threshold B is determined (step S15). When the RSSI from ANT # 3 is equal to or greater than threshold C, the RSSI from ANT # 1 is equal to or greater than threshold B, and the RSSI from ANT # 2 is equal to or greater than threshold B (step S15 Yes), in-car area 200 (area A3) is determined, and the process ends (step S16).

  If the RSSI from ANT # 3 is not greater than or equal to the threshold C, or the RSSI from ANT # 1 is not greater than or equal to the threshold B, or the RSSI from ANT # 2 is not greater than or equal to the threshold B (No in step S15), the RSSI from ANT # 1 Is greater than or equal to the threshold value D (step S17). If the RSSI from ANT # 1 is equal to or greater than the threshold value D (step S17 Yes), it is determined that the vehicle is in the vicinity of the outside area 300 (area A4) and the process is terminated (step S18).

  If the RSSI from ANT # 1 is not equal to or greater than the threshold D (No in step S17), it is determined whether the RSSI from ANT # 2 is equal to or greater than the threshold D (step S19). If the RSSI from ANT # 2 is equal to or greater than the threshold value D (step S19 Yes), it is determined that the vehicle is in the vicinity of the outside area 300 (area A5) and the process is terminated (step S20).

  If the RSSI from ANT # 2 is not greater than or equal to the threshold D (step S19 No), it is determined whether the RSSI from ANT # 3 is greater than or equal to the threshold E (step S21). If the RSSI from ANT # 3 is equal to or greater than the threshold value E (step S21 Yes), it is determined that the vehicle is in the vicinity outside area 300 (area A6) and the process is terminated (step S22).

  If the RSSI from ANT # 3 is not equal to or greater than the threshold E (No in step S21), it is determined that the area is far away from the vehicle, and the process ends (step S23).

  Note that the area dividing method shown in FIG. 6 and the processing procedure shown in FIG. 7 are examples, and the area dividing method and in-vehicle / outside determination processing procedure are not limited to the above-described examples, and are applied to each in-vehicle device transmission antenna. Any area division method and in-vehicle / out-of-vehicle determination processing procedure may be used so that an area can be identified by a combination of corresponding RSSI values.

  Further, the threshold setting method is not limited to the above example. In the example of FIG. 7, the thresholds are shared for ANT # 1 and ANT # 2 (the common thresholds A, B, and D are used for large, medium, and small determinations), and ANT # 1 and ANT are used for ANT # 3. A threshold (threshold C, E) different from # 2 is used. For example, the threshold value common to ANT # 1 and ANT # 2 may be used for ANT # 3, or the threshold value may be set individually for each antenna. In the above-described example, the RSSI is divided into three, large, medium, and small, using a threshold, and the area where the portable device is present is determined based on the pattern for each area shown in FIG. However, the number for dividing the RSSI is not limited to this.

  The operation example as the smart entry system has been described above. Next, the details of the operation as the smart start system will be described. FIG. 8 is a flowchart illustrating an example of an operation procedure of the in-vehicle device as the smart start system. In the operation of the smart start system, as with the operation of the smart entry system, the in-vehicle device does not always transmit the call signal of the portable device, and the user's intention to start the engine is called as a trigger. Signal transmission is started. As this trigger operation, for example, an operation in which the user presses the brake and presses the engine start button while the engine is stopped can be cited. Here, the operation as the smart start system after the trigger operation detection unit 1 of the in-vehicle device detects the trigger operation indicating the engine start request will be described.

  After detecting the user's trigger operation, the in-vehicle device transmits a calling signal to the portable device. As the vehicle-mounted device transmitting antenna for transmitting the call signal, any one of the driver-seat-side in-vehicle transmitting antenna 7, the passenger-side in-vehicle transmitting antenna 8, and the trunk-side in-vehicle transmitting antenna 9 may be used. In this embodiment, since all the in-vehicle device transmission antennas are installed in the in-vehicle area 200, the RSSI having a sufficiently large size can be obtained from any in-vehicle device transmission antenna as long as the portable device exists in the in-vehicle area 200. Can be assumed to be obtained. Therefore, the vehicle-mounted device transmission antenna that transmits the calling signal is not defined, and transmission may be performed from any vehicle-mounted device transmission antenna among the three vehicle-mounted device transmission antennas.

  After the calling signal transmission process, the operation until the vehicle-mounted device receives the answer signal and performs the in-vehicle / outside determination process (steps S31 to S35) is the same as the operation of the smart entry system described above (steps S1 to S5). Therefore, the description is omitted here.

  After the vehicle inside / outside determination in step S35, the ECU 4 determines whether the vehicle inside / outside determination result is the vehicle interior area 200, the nearby vehicle exterior area 300, or the far vehicle exterior area (step S36). If so (step S36), the engine start unit 3 is controlled to perform the engine start operation, and the process is terminated (step S37). When the determination result is the near vehicle outside area 300 or the far vehicle outside area (step S36 near vehicle outside / far vehicle outside), the operation is ended without performing the engine start (step S38).

  If it is determined in step S32 that no response signal has been received (No in step S32), the process proceeds to step S38. If it is determined in step S34 that the answer signal has not been received from the portable device or has not been correctly authenticated (No in step S34), the process proceeds to step S38.

  As described above, in the present embodiment, the installation location of the in-vehicle device transmission antenna is set to 3 in the vicinity of the driver's seat door, the passenger's seat door, and the trunk door that require locking / unlocking operation in a general vehicle. In-vehicle / external determination is performed by threshold determination on RSSI information for each vehicle-mounted device transmission antenna received by the portable device from each vehicle-mounted device transmission antenna. For this reason, the number of in-vehicle device transmission antennas is reduced, and it is not necessary to have a directivity control function, so that the system cost can be drastically reduced. In addition, by adopting a configuration in which RSSI information is fed back from the portable device to the in-vehicle device, it is possible to perform in-vehicle / out-of-vehicle determination processing using the ECU 4 on the in-vehicle device side having high processing performance, and miniaturization and low power consumption. There is an advantage that it is not necessary to carry out the in-vehicle / out-of-vehicle determination process on the portable device side that is particularly required.

Embodiment 2. FIG.
FIG. 9 is a diagram illustrating an example of a functional configuration of the in-vehicle device in the in-vehicle communication system according to the second embodiment of the present invention. As shown in FIG. 9, the vehicle-mounted device of the present embodiment is the same as the vehicle-mounted device of Embodiment 1 except that it includes an ECU 4 a instead of the ECU 4. FIG. 10 is a diagram illustrating a functional configuration example of the portable device according to the present embodiment. Components having the same functions as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and redundant description is omitted. Hereinafter, a different part from Embodiment 1 is demonstrated.

  In the present embodiment, the ECU 4a of the in-vehicle device does not include the threshold determination type in-vehicle / outside determination unit 42 of the first embodiment, and the CPU 21a of the portable device includes the threshold determination type in-vehicle / outside determination unit 213. In addition, the CPU 21a of the portable device includes a vehicle interior / exterior determination result feedback unit (determination result feedback unit) 214 that feeds back the vehicle interior / exterior determination result to the vehicle-mounted device.

  In the present embodiment, the portable device performs in-vehicle / outside determination processing based on the RSSI information detected by itself, and transmits the in-vehicle / outside determination result to the in-vehicle device. The in-vehicle device controls operations such as door locking / unlocking, engine start, and the like based on the notified vehicle inside / outside determination result.

  The area division inside and outside the vehicle in the present embodiment is the same as that in the first embodiment, and for example, the area division shown in FIG. 6 is used. FIG. 11 is a diagram illustrating a configuration example of a frame format of a frame transmitted by the in-vehicle device and the portable device according to the present embodiment. As shown in FIG. 11, the frame formats of the call signal, the response signal, and the interrogation signal in (a) to (c) are the same as those in the first embodiment.

The response of the first embodiment except that the frame of the response signal transmitted from the portable device to the in-vehicle device in FIG. 11 includes the in-vehicle / out-of-vehicle determination result instead of the RSSI information (R A , R B , R C ). It is the same as the signal.

  Details of the operation of the present embodiment will be described below. First, the operation as a smart entry system of the in-vehicle communication system of the present embodiment will be described. FIG. 12 is a flowchart illustrating an example of an operation procedure of the in-vehicle device as the smart entry system according to the present embodiment. The operation (step S1 to step S3) until the in-vehicle device detects the trigger and transmits the question signal is the same as step S1 to step S3 of the first embodiment.

  The portable device receives the interrogation signal and detects the RSSI for the signal transmitted from each in-vehicle device transmission antenna. Thereafter, the threshold determination type in-vehicle / out-of-vehicle determination unit 213 of the portable device performs in-vehicle / out-of-vehicle determination based on the RSSI detected by the RSSI detection unit 251. The inside / outside determination algorithm used at this time is the same as the algorithm described in the first embodiment. Then, the inside / outside determination result feedback unit 214 stores the inside / outside determination result in the answer signal as shown in the format of the answer signal in FIG. In this way, an answer signal storing the determination result inside and outside the vehicle is transmitted from the portable device to the in-vehicle device.

  The in-vehicle device ECU 4a determines whether or not the response signal from the portable device has been received and the response code has been correctly authenticated (step S41). If the response signal is received and it is determined that the authentication with the response code has been correctly performed (Yes in step S41), the portable device is in the in-vehicle area 200 and the nearby in-vehicle area 300 based on the in-vehicle / outside determination result stored in the response signal. Then, it is determined whether the area is outside the far-side vehicle (step S6). When the vehicle interior / exterior determination result is the vicinity vehicle exterior area 300 (step S6, vehicle exterior), the door locking / unlocking unit 2 is controlled to perform the door locking / unlocking operation requested by the user. The process ends (step S7).

  If the determination result is the in-car area 200 or the far-off car area (step S6, in-car or far-off car area), the process is terminated without performing the door locking or unlocking operation requested by the user (step S8). When it is determined in step S2 that a response signal has not been received (No in step S2), and in step S41, it has been determined that a response signal has not been received from the portable device or authentication using a response code has not been performed correctly (step S41). No), go to step S8.

  When the RSSI information from all the vehicle-mounted device transmission antennas is fed back to the vehicle-mounted device, the amount of information to be fed back increases and the frame length of the answer signal becomes long. On the other hand, when the in-vehicle / outside determination result is fed back, the amount of information to be fed back can be made smaller than that in the case where the RSSI information is fed back. Car interior / exterior determination processing is more advantageous for downsizing and lowering power consumption of portable devices by using the ECU on the in-vehicle device with higher processing performance, but it has a great impact on downsizing and lowering power consumption of portable devices. It is desirable to reduce the amount of feedback information by adopting the configuration of this embodiment.

  The operation as the smart entry system has been described above. Next, the details of the operation as the smart start system will be described. FIG. 13 is a flowchart illustrating an example of an operation procedure of the in-vehicle device as the smart start system. The operation (step S31 to step S33) from when the vehicle-mounted device detects the trigger and transmits the question signal is the same as step S31 to step S33 of the first embodiment.

  When the portable device receives the question signal, the portable device transmits an answer signal in which the determination result inside / outside the vehicle is stored to the in-vehicle device as in the case of the smart entry system. The in-vehicle device ECU 4a determines whether or not the response signal from the portable device has been received and the response code has been correctly authenticated (step S42). If the response signal is received and it is determined that the authentication by the response code has been correctly performed (Yes in step S42), the portable device is in the in-vehicle area 200 and the nearby in-vehicle area 300 based on the in-vehicle / outside determination result stored in the response signal. Then, it is determined which is the far vehicle outside area (step S36). When the vehicle interior / exterior determination result is the vehicle interior area 200 (step S36, vehicle interior), the engine start unit 3 is controlled to execute the engine start operation requested by the user and the process is terminated (step S36). S37).

  When the determination result is the near vehicle outside area 300 or the far vehicle outside area (step S36 near vehicle outside / far vehicle outside), the process is terminated without performing the engine start operation (step S38). If it is determined in step S2 that a response signal has not been received (No in step S32), and if it is determined in step S42 that a response signal has not been received from the portable device or authentication using a response code has not been performed correctly (step S42). No), go to step S38.

  As described above, in the present embodiment, the installation location of the in-vehicle device transmission antenna is set to 3 in the vicinity of the driver's seat door, the passenger's seat door, and the trunk door that require locking / unlocking operation in a general vehicle. The portable device performs the inside / outside determination by threshold determination for the RSSI information for each on-vehicle device transmission antenna received by the portable device from each on-vehicle device transmission antenna, and transmits the determination result to the on-vehicle device. I did it. For this reason, the same effect as Embodiment 1 can be obtained, and the amount of information fed back from the portable device to the in-vehicle device can be reduced.

  As described above, the in-vehicle communication system, the in-vehicle communication device, and the position determination method according to the present invention are useful for smart entry systems and smart start systems, and are particularly suitable for systems that determine the position of a portable device.

DESCRIPTION OF SYMBOLS 1 Trigger operation detection part 2 Door locking / unlocking part 3 Engine start part 4, 4a ECU
5,22 Transmitting unit 6 Transmitting antenna selection unit 7 Driver side in-vehicle transmitting antenna 8 Passenger side in-vehicle transmitting antenna 9 Trunk side in-vehicle transmitting antenna 10, 24 Receiving antenna 11, 25 Receiving unit 21, 21a CPU
23 Transmitting antenna 100 Vehicle 200 In-vehicle area 41, 211 Memory unit 42, 213 Threshold judgment type in-vehicle / outside determination unit 212 RSSI feedback unit 214 In-vehicle / outside determination result feedback unit 300 Neighborhood area outside vehicle

Claims (11)

  1. An in-vehicle communication system comprising: a portable device; and an on-vehicle device that determines an area where the portable device is present among a plurality of areas mounted on a vehicle
    The portable device is
    A received signal strength detector that detects the received signal strength of the signal received from the in-vehicle device;
    A received signal strength feedback unit for transmitting the received signal strength to the in-vehicle device; and
    With
    The in-vehicle device is
    A driver's seat side in-vehicle transmission antenna installed near the driver's seat in the vehicle;
    A passenger-side vehicle interior transmitting antenna installed in the vicinity of the passenger seat in the vehicle;
    A trunk-side in-vehicle transmitting antenna installed in the vicinity of the trunk in the vehicle;
    A transmission antenna selection unit that selects a transmission antenna to be used for signal transmission from the three transmission antennas of the driver side vehicle interior transmission antenna, the passenger side vehicle interior transmission antenna, and the trunk side vehicle interior transmission antenna;
    An in-vehicle device control unit that controls the transmission antenna selection unit to transmit signals in different time zones from the driver side vehicle interior transmission antenna, the passenger side vehicle interior transmission antenna, and the trunk side vehicle interior transmission antenna;
    The received signal strength for each of the transmit antennas received from the portable unit, respectively determined intensity step corresponding to the received signal strength by comparing a predetermined threshold value, the two or more corresponding to two or more of said transmitting antennas A position determination unit that determines an area where the portable device is present based on a combination of the intensity steps ;
    An in-vehicle communication system comprising:
  2. A portable device, a driver-seat-side in-vehicle transmission antenna installed in the vehicle and installed near the driver's seat in the vehicle, a passenger-seat-side in-vehicle transmission antenna installed in the vicinity of the passenger seat in the vehicle, and a trunk in the vehicle An in- vehicle communication system comprising three transmission antennas of a trunk-side in-vehicle transmission antenna installed in the vicinity, and an in-vehicle device that determines an area where the portable device is present among a plurality of areas,
    The portable device is
    A received signal strength detector that detects the received signal strength of the signal received from the in-vehicle device;
    Obtains the intensity step corresponding to the received signal strength by comparing the received signal strength for each of the transmitting antennas of the vehicle device of the received signal strength detecting unit detects the respective predetermined threshold, two or more of said vehicle device A position determination unit that determines an area where the portable device exists based on a combination of two or more intensity steps corresponding to the transmission antenna of
    A determination result feedback unit for transmitting the determination result of the position determination unit to the in-vehicle device;
    With
    The in-vehicle device is
    A transmitting antenna selector for selecting a transmit antenna to be used from among the three of the transmitting antenna for transmission of signals,
    An in-vehicle device control unit that controls the transmission antenna selection unit to transmit a signal from each of the driver-seat-side in-vehicle transmission antenna, the passenger-side in-vehicle transmission antenna, and the trunk-side in-vehicle transmission antenna;
    An in-vehicle communication system comprising:
  3. The in-vehicle device is
    A door locking / unlocking unit that locks or unlocks the door of the vehicle based on an instruction from the in-vehicle device control unit;
    An entry trigger operation detecting unit for detecting a trigger operation indicating that locking or unlocking of the door of the vehicle is requested;
    With
    The said in-vehicle apparatus control part transmits the calling signal for starting communication with the said portable machine, when a trigger operation | movement is detected by the said entry trigger operation | movement detection part. In-vehicle communication system.
  4. The entry trigger operation detection unit identifies the location where the trigger operation is detected,
    The in-vehicle device control unit uses the transmission antenna close to the place where the trigger operation is detected among the driver-side in-vehicle transmission antenna, the passenger-side in-vehicle transmission antenna, and the trunk-side in-vehicle transmission antenna. The in-vehicle communication system according to claim 3, wherein the transmission antenna selection unit is controlled to transmit.
  5.   The in-vehicle device control unit determines whether to lock or unlock the door of the vehicle requested by the trigger operation based on the determination result determined by the position determination unit, and based on the determination result, The in-vehicle communication system according to claim 3 or 4, wherein the door locking / unlocking unit is instructed to lock or unlock the door.
  6. The in-vehicle device is
    An engine start unit that performs an engine start operation of the vehicle based on an instruction from the in-vehicle device control unit;
    An engine trigger operation detector for detecting a trigger operation indicating that an engine start of the vehicle is requested;
    With
    The on-vehicle device control unit transmits a call signal for starting communication with the portable device when a trigger operation is detected by the engine trigger operation detection unit. The vehicle-mounted communication system as described in one.
  7.   The in-vehicle device control unit transmits the call signal using any one transmission antenna among the driver-seat-side in-vehicle transmission antenna, the passenger-side in-vehicle transmission antenna, and the trunk-side in-vehicle transmission antenna. The in-vehicle communication system according to claim 6, wherein the selection unit is controlled.
  8.   The in-vehicle device control unit determines whether or not to perform the engine start requested by the trigger operation based on the determination result determined by the position determination unit, and starts the engine to the engine start unit based on the determination result The in-vehicle communication system according to claim 6 or 7, wherein the start of operation is instructed.
  9. An in-vehicle communication device that determines an area where a mobile device is present among a plurality of areas mounted on a vehicle,
    A driver's seat side in-vehicle transmission antenna installed near the driver's seat in the vehicle;
    A passenger-side vehicle interior transmitting antenna installed in the vicinity of the passenger seat in the vehicle;
    A trunk-side in-vehicle transmitting antenna installed in the vicinity of the trunk in the vehicle;
    A transmission antenna selection unit that selects a transmission antenna to be used for signal transmission from the three transmission antennas of the driver side vehicle interior transmission antenna, the passenger side vehicle interior transmission antenna, and the trunk side vehicle interior transmission antenna;
    An in-vehicle device control unit that controls the transmission antenna selection unit to transmit signals in different time zones from the driver side vehicle interior transmission antenna, the passenger side vehicle interior transmission antenna, and the trunk side vehicle interior transmission antenna;
    The received signal strength for each of the transmit antennas received from the portable unit, respectively determined intensity step corresponding to the received signal strength by comparing a predetermined threshold value, the two or more corresponding to two or more of said transmitting antennas A position determination unit that determines an area where the portable device is present based on a combination of the intensity steps ;
    An in-vehicle communication device comprising:
  10. A position determination method of the portable device in an in-vehicle communication system comprising: a portable device; and an on-vehicle device that determines an area where the portable device is present among a plurality of areas mounted on a vehicle,
    The in-vehicle device is
    A driver's seat side in-vehicle transmission antenna installed near the driver's seat in the vehicle;
    A passenger-side vehicle interior transmitting antenna installed in the vicinity of the passenger seat in the vehicle;
    A trunk-side in-vehicle transmitting antenna installed in the vicinity of the trunk in the vehicle;
    With
    A signal transmission step in which the in-vehicle device transmits a signal in a different time zone from each of the driver side vehicle interior transmission antenna, the passenger seat side vehicle interior transmission antenna, and the trunk side vehicle interior transmission antenna;
    A reception signal strength detection step in which the portable device detects a reception signal strength of a signal received from the in-vehicle device;
    The portable device receives a received signal strength feedback unit that transmits the received signal strength to the in-vehicle device; and
    The received signal strength for each of the transmit antennas received from the portable unit, respectively determined intensity step corresponding to the received signal strength by comparing a predetermined threshold value, the two or more corresponding to two or more of said transmitting antennas A position determination step for determining an area where the portable device is present based on a combination of the intensity steps ;
    The position determination method characterized by including.
  11. A position determination method of the portable device in an in-vehicle communication system comprising: a portable device; and an on-vehicle device that determines an area where the portable device is present among a plurality of areas mounted on a vehicle,
    The in-vehicle device is
    A driver's seat side in-vehicle transmission antenna installed near the driver's seat in the vehicle;
    A passenger-side vehicle interior transmitting antenna installed in the vicinity of the passenger seat in the vehicle;
    A trunk-side in-vehicle transmitting antenna installed in the vicinity of the trunk in the vehicle;
    With
    A signal transmission step in which the in-vehicle device transmits a signal in a different time zone from each of the driver side vehicle interior transmission antenna, the passenger seat side vehicle interior transmission antenna, and the trunk side vehicle interior transmission antenna;
    A reception signal strength detection step in which the portable device detects a reception signal strength of a signal received from the in-vehicle device;
    The onboard device determines the intensity step corresponding to the received signal strength by the received signal strength for each of the transmission antennas detected by said received signal strength detecting step compares each with a predetermined threshold, two or more of said transmission A position determination step of determining an area where the portable device is present based on a combination of two or more intensity steps corresponding to an antenna ;
    A determination result feedback step of transmitting the determination result of the position determination step to the in-vehicle device;
    The position determination method characterized by including.
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JP6340716B2 (en) * 2014-03-24 2018-06-13 パナソニックIpマネジメント株式会社 Short-range wireless communication system for vehicles, portable device and in-vehicle device
JP6375701B2 (en) * 2014-06-04 2018-08-22 株式会社オートネットワーク技術研究所 Vehicle communication system, in-vehicle device, portable device, and computer program
JP6260465B2 (en) * 2014-06-23 2018-01-17 株式会社オートネットワーク技術研究所 In-vehicle device and vehicle communication system
JP6528368B2 (en) * 2014-07-14 2019-06-12 株式会社オートネットワーク技術研究所 Communication system for vehicle, in-vehicle device, portable device, and computer program
CN107074199B (en) * 2014-07-25 2019-05-03 株式会社自动网络技术研究所 Vehicular communication system and mobile unit
JP6351425B2 (en) * 2014-08-01 2018-07-04 カルソニックカンセイ株式会社 Keyless entry device and control method thereof
JP2017208580A (en) * 2014-08-22 2017-11-24 株式会社日立製作所 Radio communication system, on-vehicle radio communication system, and access point
JP5984168B1 (en) * 2015-04-23 2016-09-06 三菱電機株式会社 Wireless communication system
JP2016211334A (en) * 2015-05-13 2016-12-15 株式会社デンソー Smart entry system
JP2016211329A (en) * 2015-05-13 2016-12-15 株式会社デンソー Smart entry system
JP6561762B2 (en) 2015-10-21 2019-08-21 住友電気工業株式会社 Vehicle communication system and in-vehicle device
JP6519926B2 (en) * 2015-11-05 2019-05-29 株式会社ホンダロック Portable terminal device authentication system, and on-vehicle device
JP6394774B2 (en) * 2017-10-30 2018-09-26 株式会社オートネットワーク技術研究所 Vehicle communication system, in-vehicle device, portable device, and computer program

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