JP2015209707A - Vehicle communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle communication system in which a processing load in a portable terminal to be used as a vehicle key is small.SOLUTION: A vehicle communication system 1 is comprised of a vehicle 10 and a smartphone 20. The smartphone 20 includes: a microphone 25 for picking up a sound wave; and a BT communication part 22 for transmitting a sound wave response signal as a response to the sound wave picked up by the microphone 25. The vehicle 10 includes: speakers 17 and 18 for radiating the sound wave; a BT communication part 12 for receiving the sound wave response signal; a first counter 11b for measuring a smartphone response time required from the time the sound wave is radiated until the time the sound wave response signal is received; and an in-vehicle control part 11 for calculating a distance between the vehicle 10 and the smartphone 20 by multiplying the smartphone response time by a sound speed. The in-vehicle control part 11 permits the driving of in-vehicle equipment when it is determined that the smartphone 20 approaches the vehicle 10 on the basis of the calculated distance.

Description

  The present invention relates to a vehicle communication system.

  2. Description of the Related Art Conventionally, a vehicle communication system that uses sound waves to determine a distance between a vehicle and a portable device and permits or executes an operation of an in-vehicle device according to the distance is known. In the vehicle communication system of Patent Document 1, the in-vehicle device first radiates radio waves, and radiates sound waves after a lapse of a predetermined time from the radio wave radiation. The portable device measures the arrival time of sound waves from reception of radio waves to reception of sound waves, and wirelessly transmits this time to the in-vehicle device. The in-vehicle device calculates the distance between the vehicle and the portable device by multiplying the time obtained by subtracting a predetermined time from the sound wave arrival time by the speed of the sound wave. The in-vehicle device starts the engine when the portable device is determined to be located in the vehicle interior from the calculated distance, and locks and unlocks the door when the portable device is determined to be located outside the vehicle interior. Each switch is allowed.

JP2013-104247A

  In recent years, there is also a vehicle communication system that employs a portable terminal such as a smartphone as a vehicle key instead of a portable device. In general, it is well known that a portable terminal having a plurality of functions such as a telephone function and an Internet function can simultaneously exhibit these functions, while the processing speed decreases as the processing load increases.

  When the portable device of Patent Document 1 is replaced with a portable terminal, the portable device has three signals: reception of a sound wave, reception of a radio wave, and transmission of a radio wave, in order to calculate the distance from the portable terminal. Therefore, there is a concern about the processing load. Originally, the above three signal processes can only be performed as one function of the mobile terminal, and the delay of the millisecond order in the signal process is unavoidable particularly in the control by the operating system (OS) (for example, Android).

  The present invention has been made in view of such a situation, and an object thereof is to provide a vehicle communication system having a small processing load on a portable terminal used as a vehicle key.

  In order to solve the above-described problem, in a vehicle communication system, one of a vehicle and a portable terminal that perform wireless communication transmits a first microphone that picks up a sound wave and a radio wave that is transmitted as a response to the sound wave picked up by the first microphone. And the other of the vehicle and the mobile terminal is a first unit that measures a response time required from receiving the sound wave to receiving the radio wave, a speaker that emits the sound wave, a receiving unit that receives the radio wave, And a calculation unit that calculates the distance between the vehicle and the portable terminal by multiplying the response time by the speed of sound, and the vehicle approaches the vehicle based on the calculation distance of the calculation unit The gist of the invention is to provide a control unit that executes or permits the driving of the in-vehicle device when it is determined that the vehicle is on.

  According to this system, by transmitting and receiving two signals of sound waves and radio waves between the vehicle and the portable terminal, the distance between the two is calculated, and the portable terminal approaches the vehicle based on the calculated distance. When it is determined that the vehicle is on-board, driving of the in-vehicle device is executed or permitted.

  In the above system, one of the vehicle and the portable terminal includes a second counter that measures a processing time required for picking up the sound wave with the first microphone and transmitting a radio wave as a response to the sound wave. Preferably, the calculation unit calculates the distance between the vehicle and the portable terminal by multiplying the time obtained by subtracting the processing time from the response time by the speed of sound.

  According to this system, the calculation unit calculates the distance between the vehicle and the portable terminal with high accuracy because the time until the radio wave radiated from one of the vehicle and the portable terminal is picked up by the other is multiplied by the sound speed. can do.

  In the above system, a vehicle including a speaker includes a second microphone that picks up a sound wave, a third counter that measures a sound wave arrival time required to pick up the sound wave by emitting the sound wave, and a second microphone; The calculation unit calculates the sound speed by dividing the distance between the speaker and the second microphone by the sound wave arrival time, and uses the calculated sound speed to calculate the distance between the vehicle and the portable terminal. It is preferable to calculate.

  In general, it is well known that the sound speed changes depending on the temperature, but according to this system, the calculation unit can calculate the actual sound speed. Thereby, compared with the case where distance is calculated using a fixed value for sound speed, the distance between a vehicle and a portable terminal can be calculated with high accuracy.

  In the above system, the mobile terminal includes a first microphone and a transmission unit, and the vehicle includes two speakers provided in the vehicle, a reception unit, a calculation unit, a control unit, and an indoor device as the in-vehicle device. And a calculation unit calculates a distance between each of the two speakers and the portable terminal, and the control unit calculates a vertical line between the two speakers. Two calculation distances are set as determination distances that are longer than the distance between the bisector and each speaker and set within a range not exceeding the door located on the opposite side of the vertical bisector with respect to each speaker. If neither of these exceed the driving distance of the indoor in-vehicle device, or one of the two calculated distances does not exceed the determination distance and the other exceeds the determination distance, the outdoor in-vehicle device Preferably drive is performed or allowed

  According to this system, the control unit can execute or permit driving of the in-vehicle device for indoor use when the mobile terminal is located in the vehicle interior, and can be used for outdoor use when the mobile terminal is located outside the vehicle interior. The driving of the in-vehicle device can be executed or permitted.

  In the above system, the vehicle preferably includes a switch operated by a user, and the speaker preferably emits a sound wave triggered by the operation of the switch. Since the switch may be operated by a third party, a sound wave may be emitted regularly or irregularly after the establishment of BT communication.

  According to this system, even if a third party tries to drive a vehicle-mounted device illegally using a repeater, the third party is close to a user who possesses a smartphone used as a vehicle key. At the same time, it is necessary to approach the vehicle. Even when relaying, the distance between the vehicle and the repeater and the total distance between the repeater and the mobile terminal must be short, and a third party illegally drives the in-vehicle device. It becomes difficult.

In the above system, the sound wave radiated from the speaker is several kHz to 20 kHz which is a frequency in the audible region, and is preferably transmitted and received at a single frequency or a plurality of frequencies.
Usually, the microphone provided in the portable terminal is set so as to be able to pick up human sound, that is, sound waves in the audible area of the human. Therefore, according to this system, the microphone provided in the mobile terminal can easily pick up the sound wave emitted from the speaker.

In the above system, it is preferable to adjust the frequency of the sound wave radiated from the speaker to a frequency that the first microphone can easily pick up in advance.
In the system described above, when one of the vehicle and the portable terminal including the second counter picks up a sound wave and transmits a radio wave as a response to the sound wave, when the timing of performing other functions overlaps, It is preferable to prioritize the performance of other functions.

  According to this system, even if processing is performed with priority given to the performance of other functions, the time required to perform the other functions is included in the processing time counted by the second counter. Since the radio wave transmitted as a response to the sound wave includes processing time, the calculation distance is not affected even if priority is given to other functions. That is, there is no influence on the execution or permission of driving of the in-vehicle device. On the other hand, since other functions are preferentially processed, it is convenient for the user, and there is no problem even if OS processing is duplicated.

  The vehicle communication system of the present invention has an effect that a processing load on a portable terminal used as a vehicle key is small.

The block diagram which shows schematic structure of a vehicle communication system. The top view of the vehicle which shows various areas. The sequence chart which shows the process sequence of a vehicle-mounted control part and a smart phone control part.

Hereinafter, an embodiment of a vehicle communication system will be described with reference to the drawings.
As shown in FIG. 1, the vehicle communication system 1 performs vehicle control through wireless communication between the vehicle 10 and the smartphone 20.

<Smartphone>
As shown in FIG. 1, the smartphone 20 includes a smartphone control unit 21, a BLUETOOTH (registered trademark) communication unit (hereinafter referred to as a BT communication unit) 22, a public line communication unit 24, a microphone 25, a speaker 26, and a touch panel. And a display 27. The BT communication unit 22, the public line communication unit 24, the microphone 25, the speaker 26, and the touch panel display 27 are each electrically connected to the smartphone control unit 21 and are comprehensively controlled by the smartphone control unit 21.

  The BT communication unit 22 performs BLUETOOTH communication with a BT communication unit mounted on another device by performing frequency hopping that randomly changes the frequency of the 2.4 GHz band divided into a plurality of frequency channels. Do. The BT communication unit 22 converts the electrical signal generated by the smartphone control unit 21 into a 2.4 GHz band radio signal and wirelessly transmits the radio signal toward a preset communication area through the BT antenna 22a. The BT communication unit 22 converts a 2.4 GHz band radio signal received through the BT antenna 22a into an electrical signal. The BT communication unit 22 corresponds to a transmission unit.

The public line communication unit 24 is connected to a public line such as 3G or LTE and performs desired wireless communication, and is not the gist of the present invention.
The microphone 25 picks up sound waves and converts them into electrical signals. Note that the microphone 25 corresponds to a first microphone.

The speaker 26 converts an electric signal into a sound wave and radiates it.
The touch panel display 27 converts information indicating the touch position into an electrical signal. Moreover, an image | video is displayed based on the signal which the smart phone control part 21 produces | generates.

  The memory 21 a of the smartphone control unit 21 stores a BT device address unique to itself and an ID code common to the vehicle-mounted control unit 11 provided in the vehicle 10. The BT device address is used for pairing processing and BT communication with a communication partner having a BT communication unit. The ID code is used for mutual authentication with the in-vehicle control unit 11.

  In addition, the smartphone control unit 21 includes a second counter 21b for measuring a time required for generating a sound wave response signal as a response to the sound wave after receiving a sound wave through the microphone 25, that is, a smartphone processing time. I have. When receiving the sound wave, the vehicle-mounted control unit 11 generates a sound wave response signal including the ID code and the smartphone processing time.

  The smartphone control unit 21 searches for a device capable of pairing, a BT communication enabled mode in which BT communication is enabled with a paired communication partner, a BT communication disabled mode in which BT communication is disabled, and And a search mode. Switching between these three modes is performed by operating the touch panel display 27.

  When the smartphone control unit 21 in the search mode finds a device that can be paired, it performs a pairing process. When the pairing process is completed, the smartphone control unit 21 can perform BT communication with the paired communication partner. The communication partner is specified by a code unique to the communication partner. In order to ensure security, the pairing process may require the entry of a personal identification number unique to the communication partner. Once the personal identification number is entered, pairing can be performed without entering the personal identification number thereafter. Sometimes allowed. In some cases, pairing is permitted without entering a password once.

  In the BT communication enabled mode, when the smartphone control unit 21 paired with the in-vehicle control unit 11 receives a request signal requesting transmission of an ID code, it is stored in its own memory 21a as a response to this request signal. A response signal including the ID code is generated and wirelessly transmitted.

  Further, when receiving the sound wave through the microphone 25, the smartphone control unit 21 activates the second counter 21b and measures the smartphone processing time. Then, a sound wave response signal including the smartphone processing time and the ID code is generated and wirelessly transmitted.

  In addition, the smartphone control unit 21 receives a sound wave and generates a sound wave response signal, that is, while the second counter 21b is activated, as a vehicle key such as a telephone function or an Internet function. When it is necessary to exhibit other functions than the functions, priority is given to the display of other functions. In this case, the smartphone processing time counted by the second counter 21b is increased by the time due to giving priority to the performance of other functions.

<Vehicle>
As shown in FIG. 1, the vehicle 10 includes an in-vehicle control unit 11, a BLUETOOTH communication unit 12, an engine switch 13, an engine control device 14, a door handle sensor 15, a door lock device 16, and a first speaker. 17 and a second speaker 18. The BT communication unit 12, engine switch 13, engine control device 14, door handle sensor 15, door lock device 16, first speaker 17, and second speaker 18 are electrically connected to the in-vehicle control unit 11. The vehicle-mounted control unit 11 performs overall control.

  The BT communication unit 12 performs BLUETOOTH communication with other BT communication units by performing frequency hopping in the 2.4 GHz band. The BT communication unit 12 converts the electrical signal generated by the in-vehicle control unit 11 into a 2.4 GHz band signal. The converted radio signal is wirelessly transmitted through the BT antenna 12a toward the communication area S set in advance so as to cover the entire vehicle 10, as shown in FIG. In FIG. 2, the communication area S is an area of about 1 m around the vehicle, but can be set to an area of about 10 to 100 m around the vehicle by adjusting the BT output. The BT communication unit 12 converts a 2.4 GHz band radio signal received through the BT antenna 12a into an electrical signal. The BT communication unit 22 corresponds to a receiving unit.

As shown in FIG. 1, the engine switch 13 detects a pressing operation.
The engine control device 14 controls starting and stopping of the engine.
The door handle sensor 15 detects contact with the door handle.

The door lock device 16 switches between locking and unlocking the door.
The first speaker 17 converts a first sound wave signal (described later) generated by the in-vehicle control unit 11 into a high sound of about 20 kHz and radiates it. The second speaker 18 converts a second sound wave signal (described later) generated by the vehicle-mounted control unit 11 into a high sound of about 20 kHz and radiates it. The first and second speakers 17 and 18 convert received sound waves (high sounds) into electric signals. As shown in FIG. 2, the first speaker 17 is provided on the B-pillar on the driver's seat side, and the second speaker 18 is provided on the B-pillar on the passenger seat side. That is, the first and second speakers 17 and 18 are in a line-symmetric positional relationship with respect to the vehicle center axis. Note that the second speaker 18 corresponds to a second microphone. The vehicle central axis corresponds to a vertical bisector connecting a line connecting the first and second speakers 17 and 18.

  As shown in FIG. 1, the memory 11 a of the in-vehicle control unit 11 stores a BT device address and a personal identification number unique to itself, and an ID code common to the smartphone control unit 21 provided in the smartphone 20. The device address and password of the BT are used for pairing processing with a communication partner having a BT communication unit. The ID code is used for mutual authentication with the smartphone control unit 21. The memory 11a stores a distance calculation formula for calculating the distance between the vehicle 10 and the smartphone 20. The distance calculation formula will be described in detail later.

  Furthermore, the determination distance is stored in the memory 11a. The determination distance is set to a distance between the first speaker 17 shown in FIG. 2 and the door on the passenger seat side. In this example, a spherical area whose center is the first speaker 17 and whose radius is the determination distance is referred to as a first determination area A1. A spherical area whose center is the second speaker 18 and whose radius is the determination distance is referred to as a second determination area A2. Further, an area where the first determination area A1 and the second determination area A2 indicated by hatching in FIG. 2 overlap is defined as an indoor determination area A3.

  Moreover, the vehicle-mounted control part 11 is provided with the 1st counter 11b which measures smart phone response time, ie, time until it receives a sound wave response signal after producing | generating a sound wave signal. The in-vehicle control unit 11 also uses the first counter 11b to measure the sound speed calculation time, that is, the time until the sound wave radiated from the first speaker 17 is picked up by the second speaker 18. That is, the first counter 11b also functions as a third counter.

  The in-vehicle control unit 11 has a BT communication enable mode in which BT communication is possible with a paired communication partner, and a BT communication disable mode in which BT communication is disabled. Switching between the BT communication enabled mode and the BT communication disabled mode is performed by operating an input device (not shown).

  Note that the in-vehicle control unit 11 in the BT communication enable mode is in a state that can be paired with a device having the BT communication unit, and is paired with the device by being discovered by the searching device and subjected to pairing processing. The When the pairing process is completed, the in-vehicle control unit 11 can perform BT communication with the paired communication partner. The communication partner is specified by a code unique to the communication partner. In addition, the vehicle-mounted control part 11 calculates | requires the input of a PIN code in the case of a pairing process. When a personal identification number is input to itself, pairing with a device having the personal identification number is permitted.

  In the BT communication enabled mode, the in-vehicle control unit 11 paired with the smartphone control unit 21 periodically generates a request signal that requests transmission of an ID code, and wirelessly transmits the request signal. When receiving the response signal as a response to the request signal, the in-vehicle control unit 11 collates the ID code included in the response signal with the ID code stored in its own memory 11a.

  The in-vehicle control unit 11 generates a first sound wave signal triggered by the fact that collation with the smartphone control unit 21 is established, and activates the first counter 11b. The first sound wave signal is converted into a sound wave through the first speaker 17 and radiated.

  When receiving the sound wave response signal as a response to the sound wave, the vehicle-mounted control unit 11 determines whether or not the ID code included in the signal corresponds to the ID code stored in its own memory 11a. And the distance between the vehicle 10 (1st speaker 17) and the smart phone 20 is calculated from the distance calculation formula shown by the following (Formula 1). The (distance between the first speaker 17 and the second speaker 18) shown in (Expression 1) is set in advance for each vehicle.

(Distance between the vehicle 10 and the smartphone 20)
= {(Distance between first speaker 17 and second speaker 18) / (Sound speed calculation time)}
X {(smartphone response time)-(smartphone processing time)} (Expression 1)
The in-vehicle control unit 11 generates a second sound wave signal with the reception of the sound wave response signal as a trigger, resets the first counter 11b, and restarts the first counter 11b. The second sound wave signal is converted into a sound wave and emitted through the second speaker 18.

  When receiving the sound wave response signal as a response to the second sound wave, the in-vehicle controller 11 determines whether or not the ID code corresponds, and from the distance calculation formula, the vehicle 10 (second speaker 18) and the smartphone 20 The distance between is calculated. The in-vehicle control unit 11 corresponds to a calculation unit.

  The in-vehicle controller 11 determines the position of the smartphone 20 from the two calculated distances. When neither the first calculation distance nor the second calculation distance exceeds the determination distance stored in the memory 11a, the in-vehicle control unit 11 permits the engine to start, assuming that the smartphone 20 is located in the indoor determination area A3. When the engine switch 13 detects an operation in this state, the in-vehicle control unit 11 starts the engine through the engine control device 14.

  When one of the first calculation distance and the second calculation distance exceeds the indoor / outdoor determination distance and the other does not exceed the indoor / outdoor determination distance, the smartphone 20 is located in the determination areas A1 and A2 excluding the indoor determination area A3. The in-vehicle control unit 11 permits switching between door locking and unlocking. When the door handle sensor 15 detects contact in a state where switching between locking and unlocking of the door is permitted, the in-vehicle control unit 11 switches between locking and unlocking the door through the door locking device 16.

  The in-vehicle control unit 11 periodically generates a sound wave signal when not paired with the smartphone control unit 21. At this time, the first counter 11b is also activated. And the vehicle-mounted control part 11 measures the time (sound speed calculation time) until the sound wave radiated | emitted from the 1st speaker 17 is picked up by the 2nd speaker 18 through the 1st counter 11b. When calculating the distance between the vehicle 10 and the smartphone 20, the in-vehicle control unit 11 uses the latest sound speed calculation time in (Equation 1).

<Operation of vehicle communication system>
Next, the operation of the vehicle communication system 1 will be described according to the sequence chart shown in FIG. In the sequence chart, the in-vehicle control unit 11 and the smartphone control unit 21 are paired, the in-vehicle control unit 11 receives a response signal as a response to the request signal from the smartphone control unit 21, and the verification of the response signal is established. It is executed with this as an opportunity. That is, as will be described later, the sound wave is not radiated from the vehicle 10 periodically, but is radiated only after the response signal is verified.

  As shown in FIG. 3, the in-vehicle control unit 11 activates the first counter 11 b when the collation with the smartphone control unit 21 is established (step S <b> 1), and further outputs the first sound wave signal. Generate (step S2). The first sound wave signal is converted into a sound wave by the first speaker 17 and radiated.

  The smartphone control unit 21 that has received the sound wave activates the second counter 21b (step S3), and stops the second counter 21b at the timing of generating the sound wave response signal (step S4). And the smart phone control part 21 produces | generates a sound wave response signal (step S5). The sound wave response signal is wirelessly transmitted from the BT communication unit 22.

  The vehicle-mounted control unit 11 that has received the sound wave response signal stops the first counter 11b when the verification of the signal is established (step S6), and the distance between the vehicle 10 (first speaker 17) and the smartphone 20 Is calculated (step S7). Next, the vehicle-mounted control part 11 starts the 1st counter 11b (step S8), and also produces | generates a 2nd sound wave signal (step S9). The second sound wave signal is converted into a sound wave by the second speaker 18 and radiated.

  The smartphone control unit 21 that has received the sound wave activates the second counter 21b (step S10), and stops the second counter 21b at the timing of generating the sound wave response signal (step S11). And the smart phone control part 21 produces | generates a sound wave response signal (step S12). The sound wave response signal is wirelessly transmitted from the BT communication unit 22.

  The vehicle-mounted control unit 11 that has received the sound wave response signal stops the first counter 11b when the verification of the signal is established (step S13), and the distance between the vehicle 10 (second speaker 18) and the smartphone 20 Is calculated (step S14). And the vehicle-mounted control part 11 judges the position of the smart phone 20 with respect to the vehicle 10 from two calculation distances, and permits the drive of the vehicle-mounted apparatus according to the said position (step S15).

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) The in-vehicle controller 11 activates the first counter 11b and generates first and second sound wave signals. The first sound wave signal is converted into a sound wave by the first speaker 17 and the second sound wave signal is converted by the second speaker 18 to be emitted. The vehicle-mounted control unit 11 measures the time (sound wave response time) until the sound wave response signal for the sound wave is received from the smartphone control unit 21 through the first counter 11b, and the vehicle 10 (first and second speakers 17, 18). ) And the smartphone 20 is calculated. And the vehicle-mounted control part 11 permits the drive (starting of an engine, switching of locking and unlocking of a door) of the vehicle-mounted apparatus according to the calculated distance.

  As described above, the smartphone control unit 21 may perform reception of sound waves and wireless transmission of sound wave response signals. That is, since the number of signals that need to be processed in the mobile terminal (smartphone control unit 21) is small compared to the conventional case, the processing speed is unlikely to decrease. For this reason, since the processing speed is unlikely to decrease when functions other than the function as the vehicle key of the smartphone 20 (telephone function, Internet function, etc.) are exhibited, the usability of the smartphone 20 is good.

  (2) The smart phone control unit 21 is provided with a second counter 21b that measures the time (smartphone processing time) from when the sound wave is received until the sound wave response signal is generated. The smartphone control unit 21 generates a sound wave response signal including the smartphone processing time. And the vehicle-mounted control part 11 calculates the distance between the vehicle 10 and the smart phone 20 by multiplying the speed of sound by the time obtained by subtracting the smartphone processing time from the smartphone response time. That is, since the distance for the time required for the smartphone control unit 21 to generate the sound wave response signal is excluded from the calculated distance, the distance between the vehicle 10 and the smartphone 20 can be calculated with higher accuracy. it can.

  (3) The second speaker 18 is used as a microphone that receives sound waves emitted from the first speaker 17. The vehicle-mounted control unit 11 measures the time (sound wave arrival time) until the second speaker 18 receives the sound wave radiated from the first speaker 17 through the first counter 11b. The speed of sound is calculated by dividing the distance between them by the arrival time of sound waves. And the vehicle-mounted control part 11 calculates the distance between the vehicle 10 and the smart phone 20 using the newest sound speed. It is well known that the speed of sound generally varies with temperature. That is, the distance between the vehicle 10 and the smartphone 20 can be calculated with higher accuracy than when the distance is calculated using a fixed value for the sound speed.

  (4) The first speaker 17 is provided on one of the B pillars of the vehicle 10 and the second speaker 18 is provided on the other. That is, the first and second speakers 17 and 18 are in a line-symmetric positional relationship with respect to the vehicle center axis. The in-vehicle control unit 11 calculates the distance between the first speaker 17 and the smartphone 20 and the distance between the second speaker 18 and the smartphone 20, respectively. And the vehicle-mounted control part 11 makes the distance between the door of the 1st speaker 17 and the 2nd speaker 18 side a determination distance, and when the two calculation distances do not exceed the determination distance, ie, the smart phone 20 If it is located in the passenger compartment, the engine is allowed to start. On the other hand, when one of the two calculated distances does not exceed the determination distance and the other exceeds the determination distance, that is, when the smartphone 20 is located outside the passenger compartment, the in-vehicle control unit 11 switches between locking and unlocking the door. Allow. As described above, the in-vehicle control unit 11 can permit driving of the in-vehicle device in accordance with the position of the smartphone 20 with respect to the vehicle 10.

  (5) The smartphone control unit 21 receives a sound wave and generates a sound wave response signal, that is, while the second counter 21b is activated, as a vehicle key such as a telephone function or an Internet function. When it is necessary to exhibit other functions other than the above functions, priority is given to the display of other functions. In this case, the smartphone processing time counted by the second counter 21b is increased by the time due to giving priority to the performance of other functions. However, since the in-vehicle controller 11 subtracts the smartphone processing time from the smartphone response time when calculating the distance between the vehicle 10 and the smartphone 20, the calculated distance is not affected. That is, there is no influence on the permission of driving the in-vehicle device. On the other hand, since the other functions of the smartphone 20 are preferentially processed, it is convenient for the user.

In addition, you may change the said embodiment as follows.
-In the said embodiment, although the vehicle-mounted control part 11 paired with the smart phone control part 21 produces | generates a sound wave response signal triggered by the collation of ID code exchanged with the smart phone control part 21 being materialized, The generation of the sound wave response signal may be performed at the following timing. That is, a sound wave response signal may be generated when the engine switch 13 or the door handle sensor 15 is operated after the verification is established. If comprised in this way, unless the engine switch 13 and the door handle sensor 15 are operated, a sound wave will not be radiated | emitted. Therefore, even when the sound wave is an audible sound, it is not noisy because the sound wave is emitted only once.

  In the above embodiment, the sound wave emitted from the first and second speakers 17 and 18 is a high-frequency sound wave, but it is easy for humans to hear, in other words, a sound wave having a frequency that is easy for humans to emit, specifically, It may be a sound wave of 1 kHz to 20 kHz that is the frequency of the audible region. If it is a microphone employed in a normal smartphone 20, it is possible to pick up sound waves of a frequency emitted by humans without any problem, so that sound waves emitted from the first and second speakers 17 and 18 can be picked up without any problem. . In addition, when this separate example is applied to the above-described another example, sound waves in an easily audible region are emitted when the engine switch 13 or the door handle sensor 15 is operated, so that the user can It is hard to feel noisy.

  In the embodiment described above, the first and second speakers 17 and 18 may be adjusted in advance so as to radiate sound waves in accordance with frequencies that are easily picked up by the microphone employed in the smartphone 20. If comprised in this way, the operation | movement reliability of the vehicle communication system 1 will increase.

  In the above embodiment, in order to separate the area where the engine is permitted to start and the area where the door is allowed to be locked and unlocked, the determination distance is used to determine the position inside and outside the vehicle interior of the smartphone 20, It is not necessary to determine the position outside the vehicle interior. That is, whether or not the smartphone 20 is closer to the vehicle 10 than a specific distance in a case where the region where the engine is permitted to start and the region where the door is allowed to be locked and unlocked are not separated. It is only necessary to judge. In this case, for example, the vehicle-mounted control unit 11 detects an operation on the door handle through the door handle sensor 15 provided in the door handle on the driver's seat side and the distance from the first speaker 17 to the smartphone 20 is short. Switch between door locking and unlocking.

  The vehicle-mounted control unit 11 performs the same operation with the second speaker 18 at a time different from the time when the sound wave is radiated from the first speaker 17, and locks and unlocks the passenger seat side door. Switching may be permitted. That is, the loudspeakers 17 and 18 may be operated independently in a time-sharing manner so that the time for emitting sound waves does not overlap, and the vehicle operation may be permitted based on the distance calculated from the emitted sound waves. In the above embodiment, the in-vehicle control unit 11 calculates the sound speed from the sound wave arrival time between the first and second speakers 17 and 18, and uses the sound speed between the vehicle 10 and the smartphone 20. Although the distance is calculated, a fixed sound speed value may be used for calculating the distance.

  -In above-mentioned embodiment, although the vehicle-mounted control part 11 calculated the distance between the vehicle 10 and the smart phone 20 using the time which deducted the smart phone processing time measured by the 2nd counter 21b from the smart phone response time. In the case where there is little variation in the smartphone processing time, the smartphone processing time may be a fixed value. When the smartphone processing time is a fixed value, the second counter 21b can be omitted. In the above embodiment, the first and second speakers 17 and 18 are provided on the vehicle 10, but either one may be omitted. The speakers 17 and 18 do not necessarily have to be provided on the B pillar as shown in FIG. Determination areas A1 and A2 may be positioned outside the left and right passenger compartments, and an indoor determination area that is an overlapping portion of determination areas A1 and A2 may be positioned in the passenger compartment.

In the above embodiment, the in-vehicle control unit 11 functions as a calculation unit, but the calculation unit may be different from the in-vehicle control unit 11.
In the above embodiment, the vehicle 10 emits sound waves and receives radio waves (sound wave response signals), and the smartphone 20 picks up sound waves and transmits radio waves (sound wave response signals). There may be. The smartphone controller 21 may calculate the distance between the vehicle 10 and the smartphone 20. In this case, the smartphone control unit 21 may wirelessly transmit the calculated distance, and may determine whether to execute or permit the operation of the in-vehicle device according to the distance received by the in-vehicle control unit 11.

In the above embodiment, the second counter 21b may be omitted. In this case, the smartphone control unit 21 does not include the smartphone processing time in the sound wave response signal.
-In the said embodiment, you may perform the search of the other party and the pairing process which can be paired from the vehicle-mounted control part 11. FIG.

In the above embodiment, the communication standard between the vehicle 10 and the smartphone 20 is not limited to BLUETOOTH.
In the above-described embodiment, the smartphone 20 is used as the mobile terminal, but instead of this, a tablet terminal that does not have a telephone function, a portable music terminal, a notebook computer, or the like may be used.

  -In the said embodiment, a sound wave may not be a single frequency of 20 kHz, for example. For example, frequency modulation using different frequencies in a specific range such as 18 to 20 kHz may be used. Further, amplitude modulation may be performed.

DESCRIPTION OF SYMBOLS 1 ... Vehicle communication system, 10 ... Vehicle, 11 ... Vehicle-mounted control part, 11b, 21b ... Counter, 12, 22 ... BT communication part, 17, 18 ... Speaker, 20 ... Smartphone, 21 ... Smartphone control part, 25 ... Microphone.

Claims (8)

One of the vehicle and the mobile terminal that performs wireless communication includes a first microphone that picks up sound waves, and a transmission unit that transmits radio waves as a response to the sound waves picked up by the first microphone,
The other of the vehicle and the portable terminal includes a speaker that emits sound waves, a receiving unit that receives radio waves, a first counter that measures response time required to receive radio waves after emitting sound waves, and a response time A calculation unit that calculates the distance between the vehicle and the mobile terminal by multiplying the sound speed by
A vehicle communication system provided with a control part which performs or permits driving of an in-vehicle device, when a vehicle is judged that a portable terminal is approaching the said vehicle based on a calculation distance of a calculation part. The vehicle communication system according to claim 1,
One of the vehicle and the portable terminal is provided with a second counter that measures a processing time required to transmit a radio wave as a response to the sound wave after picking up the sound wave with the first microphone, and superimposes the processing time on the radio wave. Send
The calculation unit is a vehicle communication system that calculates the distance between the vehicle and the mobile terminal by multiplying the time obtained by subtracting the processing time from the response time by the speed of sound. The vehicle communication system according to claim 1 or 2,
A vehicle including a speaker includes a second microphone that picks up a sound wave, and a third counter that measures a sound wave arrival time required to pick up the sound wave by the second microphone after emitting the sound wave,
The calculation unit calculates the sound speed by dividing the distance between the speaker and the second microphone by the sound wave arrival time, and uses the calculated sound speed to calculate the distance between the vehicle and the mobile terminal. Communications system. In the vehicle communication system according to any one of claims 1 to 3,
The portable terminal includes a first microphone and a transmission unit,
The vehicle includes two speakers provided in the vehicle, a reception unit, a calculation unit, a control unit, and an indoor in-vehicle device and an outdoor in-vehicle device as the in-vehicle device,
The calculation unit calculates the distance between each of the two speakers and the mobile terminal,
The control unit includes a door that is longer than a distance between a vertical bisector connecting a line connecting the two speakers and each speaker and is located on the opposite side of the vertical bisector with respect to each speaker. If neither of the two calculated distances exceeds the determination distance set within the range, driving or permitting the driving of the in-vehicle device for indoor use, and one of the two calculated distances does not exceed the determination distance A vehicle communication system that executes or permits driving of an outdoor vehicle-mounted device when the other exceeds the determination distance. The vehicle communication system according to claim 4,
The vehicle includes a switch operated by a user,
The speaker is a vehicle communication system that emits sound waves triggered by the operation of a switch. In the vehicle communication system according to claim 4 or 5,
The sound wave radiated from the speaker has a frequency in the audible region of several kHz to 20 kHz, and is transmitted and received at a single frequency or a plurality of frequencies. In the vehicle communication system according to claim 4 or 5,
A vehicle communication system that adjusts the frequency of a sound wave emitted from a speaker to a frequency that is easily picked up by a first microphone. The vehicle communication system according to claim 2,
If one of the vehicle and the portable terminal provided with the second counter picks up the sound wave and transmits the radio wave as a response to this sound wave, the other function is Vehicle communication system that prioritizes the demonstration of