JP2012172334A - Vehicle radio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle radio device capable of accurately determining whether a portable machine exists in or out of a cabin.SOLUTION: Out-of-vehicle antennas 3-5 and in-vehicle antennas 6-8 are installed in pairs out of and in a vehicle 1 across its body. Detectors 9-11 calculate the signal strength of radio signals received from a portable machine 2 by the out-of-vehicle antennas 3-5 and the in-vehicle antennas 6-8. An ECU 12 compares the signal strength for the out-of-vehicle antennas 3-5 with the signal strength for the in-vehicle antennas 6-8, calculated by the detectors 9-11, and determines whether the portable machine 2 exists in or out of a cabin.

Description

  The present invention relates to a vehicle wireless device used in a smart keyless device that locks and unlocks a door of a vehicle by wireless communication.

  The smart keyless device can lock and unlock the door of the automobile by remote control without using a physical key. This is because if a user who has a portable electronic key (hereinafter referred to as a portable device) enters the detection area of the in-vehicle wireless device installed in the automobile and the key information can be authenticated between the portable device and the in-vehicle wireless device, the vehicle door Is unlocked. At that time, the user does not need to use the physical key.

  A conventional smart keyless device uses, for example, a UHF (Ultra-High Frequency) band radio signal having a frequency of 315 MHz and a 130 kHz LF (Long Frequency) band radio signal. The UHF band having a frequency of 315 MHz is called an RF (Radio frequency) band. The radio signal in the RF band is used for data communication of key information (ID) of the portable device. LF band radio signals are used for area detection of portable devices.

  The configuration of a conventional smart keyless device includes an in-vehicle wireless device and a portable device. The in-vehicle wireless device is mounted on an automobile, and the portable device is possessed by a user (user) who uses the automobile. The door lock unlocking operation is as follows. In other words, triggered by the operation of the user holding the portable device pulling the door knob or pushing the door switch, the in-vehicle wireless device transmits an area detection signal from the LF band antenna to the portable device, and whether or not the area detection signal can be received. Car interior / exterior determination processing of the portable device is performed. As a response to the area detection signal, the portable device modulates preset key information and returns it to the in-vehicle wireless device with an RF signal. The in-vehicle wireless device collates the result of the determination of the interior / exterior of the portable device with the key data, and unlocks the door lock if the portable device exists outside the vehicle compartment and the key data matches.

  For example, as disclosed in Patent Document 1, the interior / exterior determination of the interior of the portable device is performed by communicating with an interior antenna for communicating with a portable terminal existing in the interior of the vehicle and a portable terminal existing outside the interior of the vehicle. Whether the mobile terminal is in the vehicle interior or outside the vehicle interior based on the communication state via the vehicle interior antenna and the communication state via the vehicle exterior antenna is installed. It was determined.

JP 2003-124863 A

  In the vehicular radio apparatus described in Patent Document 1 above, due to the shielding effect of the vehicle body, when the portable device exists in the vehicle interior, the radio wave transmitted by the portable device can be received only by the vehicle interior antenna, It cannot be received. Alternatively, the reception intensity of the vehicle interior antenna is greater than the reception intensity of the vehicle exterior antenna. In addition, when the portable device exists outside the vehicle compartment, it can be received only by the antenna outside the vehicle compartment and cannot be received by the antenna inside the vehicle compartment. Alternatively, the reception intensity of the vehicle interior antenna is greater than the reception intensity of the vehicle interior antenna.

  However, the vehicle body shielding effect used in the conventional device is not constant, and there is a direction (position) in which radio waves transmitted by the portable device existing in the vehicle compartment are strongly emitted outside the vehicle compartment. In addition, there is a direction (position) in which radio waves transmitted from a portable device outside the passenger compartment strongly enter the passenger compartment. Therefore, depending on the positions of the vehicle interior antenna and the vehicle exterior antenna, there are places where the reception intensity of the vehicle exterior antenna is higher than the reception strength of the vehicle interior antenna even when the portable device is present in the vehicle interior. On the contrary, there is a place where the portable device exists outside the passenger compartment and the reception intensity of the vehicle interior antenna is larger than the reception intensity of the vehicle interior antenna. In this way, there is a place where the reception intensity of the vehicle interior antenna and the vehicle exterior antenna is reversed, and in the configuration of the above-mentioned conventional device, there is a possibility that the vehicle interior / exterior determination may be erroneous, and the vehicle interior / exterior of the portable device is correctly determined There was a problem that could not.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a vehicle radio apparatus that can accurately determine whether the portable device is inside or outside the vehicle.

  A vehicle radio apparatus according to the present invention includes a portable device having a wireless communication function and an in-vehicle wireless device that performs wireless communication with the portable device, wherein the in-vehicle wireless device sandwiches the body of the vehicle. The signal strength of the radio signal from the portable device received by the vehicle antenna and the vehicle antenna, each receiving a radio signal from the portable device, and the portable antenna received by the vehicle antenna and the vehicle antenna, respectively. Detecting means for calculating the signal intensity, and determining means for comparing the signal intensity at the antenna for the outside of the vehicle and the signal intensity at the antenna for the inside of the car calculated by the detecting means to determine whether the portable device exists inside or outside the vehicle interior. It is a thing.

  In the vehicle radio apparatus according to the present invention, the vehicle antenna and the vehicle interior antenna are installed so as to be paired inside and outside the vehicle body, and the signal intensity is compared to determine whether the portable device is inside or outside the vehicle. Therefore, the inside / outside determination of the portable device can be accurately performed.

1 is a block configuration diagram showing an overall configuration of a vehicle radio apparatus according to Embodiment 1 of the present invention. 1 is a perspective view of a vehicle to which a vehicle radio device according to Embodiment 1 of the present invention is applied. It is explanatory drawing which shows the distribution position of the signal strength received with these antennas, the attachment position of the antenna for vehicles outside and the antenna for vehicles in the vehicle wireless device by Embodiment 1 of this invention. It is a block diagram which shows the detector and ECU of a vehicle radio apparatus by Embodiment 1 of this invention. It is a block diagram of the detector of the vehicle radio apparatus by Embodiment 1 of this invention. It is a flowchart which shows the operation | movement from the door locked state of the vehicle of the vehicle radio | wireless apparatus by Embodiment 1 of this invention to a door lock unlocking. It is a flowchart which shows the operation | movement from the engine stop state of the vehicle of the vehicle radio | wireless apparatus by Embodiment 1 of this invention to an engine start. It is a flowchart which shows the majority decision processing of the vehicle radio apparatus by Embodiment 1 of this invention. It is explanatory drawing which shows the relationship between the determination result in the vehicle interior and exterior antenna installed in each door of the vehicle radio | wireless apparatus by Embodiment 1 of this invention, and a majority determination result. It is a block diagram which shows the detector and ECU of a vehicle radio apparatus by Embodiment 2 of this invention. It is a block diagram which shows the detector and ECU of a vehicle radio apparatus by Embodiment 3 of this invention.

Embodiment 1 FIG.
The present invention relates to a device configuration and a determination procedure of an in-vehicle wireless device that determines whether a portable device exists in a vehicle cabin or outside a vehicle cabin. First, the configuration will be described.
1 is an overall configuration diagram of a vehicle radio apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a perspective view of a vehicle equipped with the vehicle radio apparatus according to Embodiment 1 of the present invention.
In these drawings, the vehicle 1 is provided with outside antennas 3, 4, 5 that are installed outside the vehicle 1 and receive radio signals from the portable device 2. In-vehicle antennas 6, 7, and 8 for receiving radio signals from the portable device 2 are installed in the vehicle 1. The vehicle exterior antenna 3 and the vehicle interior antenna 6 are installed so as to be paired with the driver's seat door of the vehicle 1 interposed therebetween, and the vehicle exterior antenna 4 and the vehicle interior antenna 7 are paired with the passenger seat door of the vehicle 1 interposed therebetween. It is installed to become. Furthermore, the vehicle exterior antenna 5 and the vehicle interior antenna 8 are installed so as to be paired with a door behind the vehicle 1 interposed therebetween.

The outside antenna 3 and the inside antenna 6 are provided with a detector 9 for calculating the reception intensity at these antennas, and the outside antenna 4 and the inside antenna 7 are provided at a reception intensity at these antennas. Further, a detector 11 for calculating reception intensity at these antennas is connected to the outside antenna 5 and the inside antenna 8 respectively.
Both side doors of the vehicle 1 indicate a driver side door and a passenger side door, and the rear door of the vehicle may be a trunk (luggage) door if the vehicle 1 is a sedan type, a minivan type or the like. Indicates a hatchback door. The detectors 9 to 11 constitute detection means for calculating the signal intensity of the radio signal from the portable device 2.

The detectors 9 to 11 are respectively connected to an electric control unit (hereinafter referred to as ECU) 12, and the reception intensity data output from the detectors 9 to 11 is input to the ECU 12. ing. The ECU 12 has a function of performing a vehicle interior / exterior determination process of the portable device 2 based on the received intensity data from the detectors 9 to 11. The ECU 12 is connected to a data communication antenna 13 via a transmission / reception means 14 and is connected to an engine start switch 15 and a door lock release switch (door knob) 16. The data communication antenna 13 is an antenna for wirelessly communicating key information (ID) with the portable device 2, and the transmission / reception means 14 is a means for performing data communication processing for connecting the data communication antenna 13 to the ECU 12. . The engine start switch 15 is a switch for starting the engine of the vehicle 1. Further, the door lock release switch 16 is a switch for releasing the door lock of the driver's seat door of the vehicle 1, and although omitted in the drawing, the door knob is also present in the passenger seat door and the rear door.
The in-vehicle wireless device includes the above-described configuration of the vehicle exterior antenna 3 to the door lock release switch 16.

  The vehicle outside area 17 is an area provided outside the vehicle near the driver's seat door of the vehicle 1, the vehicle outside area 18 is provided outside the vehicle near the passenger seat door, and the vehicle outside area 19 is provided outside the vehicle near the trunk door. The vehicle interior area 20 is an area provided inside the vehicle 1.

  The determination boundary 21 is a boundary surface formed from the reception strength of the vehicle exterior antenna 3 and the vehicle interior antenna 6 installed in the driver's seat door, and the vehicle determination boundary 22 is the vehicle exterior antenna 4 installed in the passenger seat door and the vehicle interior. The boundary surface formed from the reception intensity of the antenna 7 and the determination boundary 23 are boundary surfaces formed from the reception intensity of the vehicle exterior antenna 5 and the vehicle interior antenna 8 installed on the rear door. These determination boundaries 21, 22, and 23 are boundary surfaces for determining whether the portable device 2 exists inside the vehicle compartment or outside the vehicle compartment. When the portable device 2 is present in the vehicle exterior area, the reception intensity of the vehicle exterior antenna is high, and when the portable device 2 is present in the vehicle interior area, the reception strength of the vehicle interior antenna is large. The relationship between the determination boundaries 21, 22, and 23 and the reception strength will be described in detail with reference to FIG. 3 below. The determination boundary is a position where the magnitude relationship between the reception strength of the outside antenna and the reception strength of the in-vehicle antenna is reversed. Yes, it coincides with the boundary between the interior and exterior of the vehicle door where the in-vehicle antenna and the in-vehicle antenna are installed. As shown in FIG. 1 or FIG. 2, the determination boundaries 21, 22, and 23 can be set in parallel with the vehicle door surface. In FIG. 2, the judgment boundaries 21, 22, and 23 are explicitly shown, and even in the roof (ceiling) area of the vehicle 1, the inside / outside of the portable device 2 is compared with the magnitude of the reception strength of the installed inside / outside antenna. Judgment is possible. That is, it is possible to determine whether the portable device 2 is inside or outside the vehicle 1 by installing the vehicle 1 across the body of the vehicle 1 other than doors such as a driver door, a passenger door, and a rear door.

  A conventional smart keyless device performs data communication of key information (ID) held by the portable device 2 using a wireless signal of 315 MHz, and determines whether the portable device 2 is inside or outside the vehicle using a wireless signal of 130 kHz. In the present invention, the radio signals used for data communication and vehicle interior / exterior determination have the same frequency, for example, 315 MHz, which is conventionally used for data communication of a smart keyless device.

When a 130 kHz wireless signal is used for vehicle interior / exterior determination, the 130 kHz data wireless signal has a longer wavelength than the 315 MHz data communication signal, and in order to receive signals efficiently with a small antenna that can be mounted on a vehicle, A bar antenna is used in which a copper wire having an insulating coating surface is wound around a rod-shaped core having a high magnetic permeability. Therefore, the 130 kHz antenna is expensive, and there is a problem that it is difficult to downsize the antenna of 315 MHz.
In the present invention, by sharing the frequency of the radio signal for data communication and the vehicle interior / exterior determination to 315 MHz, the vehicle-mounted antenna can be made common, downsized, and reduced in cost.
In addition to the frequency of 315 kHz, the frequency of the radio signal is 130 kHz used for the conventional vehicle interior / exterior determination, and also the 915 MHz or 2.45 GHz used for the RF-ID tag realizes the vehicle interior / exterior determination function described in the present invention. It is possible to do.

FIG. 3 is a diagram for explaining the attachment positions of the vehicle exterior antenna and the vehicle interior antenna and the distribution of signal strength received by the vehicle exterior antenna and the vehicle interior antenna. Reference numeral 31 denotes a driver's seat door of the vehicle 1, and FIG. 3 (a) is a top view of the vehicle as viewed from above. Reference numeral 32 denotes an axis of the driver's seat door 31 parallel to the vehicle traveling direction for explaining the antenna mounting position.
The reception strength 33 indicates the reception strength of the wireless signal from the portable device 2 received by the vehicle exterior antenna 3, and the reception strength 34 indicates the reception strength of the wireless signal from the portable device 2 received by the vehicle interior antenna 6. The reception intensity distribution 35 in FIG. 3B shows the distribution of reception intensity received by the vehicle antenna 3 when the portable device 2 is moved along the line AA ′ shown in FIG. Similarly, the reception intensity distribution 36 is a distribution of the reception intensity received by the in-vehicle antenna 6 along the line AA ′. The intensity difference distribution 37 is an intensity difference distribution obtained from the reception intensity distribution 35 of the vehicle antenna 3 and the reception intensity distribution 36 of the vehicle antenna 6 along the line AA ′ shown in FIG. . The reception intensity distribution 38 in FIG. 3C shows the distribution of the reception intensity received by the vehicle exterior antenna 3 along the line BB ′ shown in FIG. 3A, and the reception intensity distribution 39 is obtained by the vehicle interior antenna 6. This is a distribution of received intensity. The intensity difference distribution 40 is an intensity difference distribution obtained from the reception intensity distribution 38 of the vehicle antenna 3 and the reception intensity distribution 39 of the vehicle antenna 6.

Next, attachment positions of the vehicle exterior antenna 3 and the vehicle interior antenna 6 will be described.
The vehicle exterior antenna 3 receives a radio signal of the portable device 2 existing inside or outside the vehicle interior. When the distance between the portable device 2 and the vehicle exterior antenna 3 is short, the reception strength is large, and the reception strength is weakened as the distance increases. The in-car antenna 6 is attached to the inside of the car with the driver's seat door 31 that is a metal body in a position that makes a pair with the in-car antenna 3 and receives a radio signal of the portable device 2 existing outside or inside the car room. To do. The reception intensity 34 of the in-vehicle antenna 6 becomes weaker as the distance from the in-vehicle antenna 6 increases, similarly to the reception intensity 33 of the in-vehicle antenna 3.

  As shown in FIG. 3A, attachment of the position where the vehicle antenna 3 and the vehicle antenna 6 are paired is based on the axis 32 parallel to the vehicle traveling direction of the driver seat 31 as shown in FIG. The antenna is installed at the same position at the same position on the inside and outside of the door surface with respect to each other. If the distance between the door antenna surface 3 and the vehicle interior antenna 6 is less than 10% of the wavelength of the radio signal to be used, the reception intensity is the same as when the vehicle interior and exterior antennas are installed in close contact with the door surface. Characteristics can be obtained.

  FIG. 3B is a diagram illustrating the reception intensity distribution of the vehicle antenna 3 and the vehicle antenna 6 along the line A-A ′ illustrated in FIG. In the reception intensity distribution 35 received by the vehicle exterior antenna 3, the reception strength decreases in the vehicle exterior area according to the distance between the vehicle exterior antenna 3 and the portable device 2, that is, the radio signal propagation distance. In the in-vehicle area, since the propagation is shielded by the metallic driver's seat door 31, the reception intensity in the reception intensity distribution 35 sharply decreases with the driver's seat door 31 as a boundary. On the other hand, the reception intensity distribution 36 received by the in-vehicle antenna 6 has a high reception intensity at a position close to the in-vehicle antenna in the in-vehicle area, and the reception intensity decreases as the distance increases. In the area outside the vehicle, propagation of radio signals from the portable device 2 is blocked by the driver's seat door 31, so that the reception intensity is weak in the area outside the vehicle from the driver's seat door 31.

  As described above, the radio signal transmitted by the portable device 2 existing outside the vehicle interior by installing the vehicle exterior antenna 3 and the vehicle interior antenna 6 at a position that makes a pair with the driver's seat door that is a vehicle metal body in between. The transmission is shielded by the driver's seat door, which is a metal body, and the signal intensity of the radio signal propagated into the passenger compartment is attenuated. Thereby, the difference between the signal strength received by the vehicle exterior antenna 3 and the signal strength received by the vehicle interior antenna 6 becomes larger than the signal strength difference due to the propagation distance difference (intensity difference due to free space propagation loss). Therefore, it becomes possible to accurately determine that the portable device 2 exists outside the passenger compartment by comparing the signal intensities. Conversely, the radio signal transmitted by the portable device 2 existing in the passenger compartment is shielded by the driver's seat door, which is a metal body, and the signal strength of the radio signal propagated outside the passenger compartment is reduced. Thus, the difference between the signal strength received by the vehicle antenna 6 and the signal strength received by the vehicle interior antenna 6 becomes large, so that it can be accurately determined that the portable device exists in the vehicle interior.

  The intensity difference distribution 37 of the line AA ′ obtained by subtracting the value of the reception intensity distribution 36 of the vehicle interior antenna 6 from the value of the reception intensity distribution 35 of the vehicle exterior antenna 3 represents the position of the driver seat door 31, and The difference in intensity matches the change from the positive value in the outside area to the negative value in the inside area. Thereby, if the sign of intensity difference distribution 37 is plus, it can be judged that portable device 2 exists outside the passenger compartment. Conversely, if the sign of the intensity difference distribution 37 is negative, it can be determined that the portable device 2 is present in the vehicle compartment. Furthermore, since the position where the sign of the intensity difference distribution 37 is reversed coincides with the driver's seat door 31, the inside / outside determination boundary can be matched with the inside / outside boundary of the driver's seat door 31.

  Next, the reception intensity distribution (FIG. 3C) of the vehicle exterior antenna 3 and the vehicle exterior antenna 6 along the line B-B 'shown in FIG. This line BB ′ is shifted to the front of the vehicle 1 with respect to the line AA ′, and shows an intensity distribution at a position different from the line connecting the vehicle exterior antenna 3 and the vehicle interior antenna 6. . The reception intensity distribution 38 of the outside antenna 3 and the reception intensity distribution 39 of the in-vehicle antenna at the line BB ′ are separated from the in-vehicle antenna 3 and the in-vehicle antenna 6 (in the front of the vehicle). Although the reception intensity is generally lower than the reception intensity at A ′, the tendency of the reception intensity distribution due to the shielding of the driver's seat door 31 is the same. The reception intensity distribution 38 of the vehicle exterior antenna 3 is large in the vehicle exterior area and small in the vehicle interior area that is shielded. On the contrary, the reception intensity distribution 39 of the vehicle interior antenna 6 is large in the vehicle interior area and is small in the vehicle exterior area subjected to shielding.

The intensity difference distribution 40 on the line BB ′ obtained by subtracting the value of the reception intensity distribution 39 of the vehicle interior antenna 6 from the value of the reception intensity distribution 38 of the vehicle exterior antenna 3 is obtained from the plus value in the vehicle exterior area. The change to the negative value of the area coincides with the position of the driver's seat door 31. Therefore, from the sign of the intensity difference distribution 40 as well as the intensity difference distribution 37 of the line AA ′, the inside / outside of the vehicle interior of the portable device 2 can be determined also in the line BB ′. It can be matched to the driver's seat door position (boundary). In line AA ′ and line BB ′, the vehicle interior / exterior determination boundary of portable device 2 can be matched with the vehicle interior / exterior boundary of driver's seat door 31, which is not shown in FIG. Similarly, the vehicle interior / exterior determination boundary of the portable device 2 can be matched with the vehicle interior / external boundary of the driver's seat door 31 in other lines orthogonal to the seat door. Although the description is omitted, the same thing can be made for the passenger compartment door and the rear door to match the vehicle interior / exterior determination boundary of the portable device 2 with the boundary of the door interior / exterior of the door. , 22, 23, and the like, the vehicle and the outside judgment boundary can be set by a straight line along the vehicle body, and the vehicle body along the vehicle body. The inside / outside position can be determined.

Further, although not shown in FIG. 3 (a), the intensity shown in FIG. 3 (b) is also obtained in a line in which the line AA ′ is vertically shifted upward or a line in which the line AA ′ is vertically shifted downward. Similar to the difference distribution, the characteristic that the change from the plus value in the outside area to the minus value in the inside area coincides with the position of the driver's seat door 31 is established.
As a result, as shown in FIG. 2, the vehicle interior / external judgment boundary can be set in a plane along the vehicle body by installing the vehicle door on the inside and outside of the vehicle door. Thus, the position inside and outside the vehicle can be determined.

  The mounting position of the vehicle antenna 3 is mounted in the door knob of the driver's door in consideration of the ease of antenna mounting, the durability of mounting, and the design of the vehicle 1. The mounting position of the in-vehicle antenna 6 that forms a pair with the out-of-vehicle antenna 3 is the same position as the out-of-vehicle antenna 3 in the position inside the driver's seat door that is symmetric with respect to the axis 32 parallel to the vehicle traveling direction of the driver's seat door 31 The height. Thereby, the determination boundary inside and outside the vehicle can be set by a straight line (plane) along the vehicle body, and the position inside and outside the vehicle can be determined along the vehicle body.

  In order to enhance the shielding effect of the radio signal by the driver's seat door (metal body), the mounting position of another in-vehicle antenna 6 is set to the wavelength 20 of the radio signal used from the mounting position of the in-vehicle antenna 6. You may attach to the position lower than the antenna 3 for vehicles outside in the range below%. Thereby, the effect of making it difficult to receive a radio signal that is diffracted by the window frame of the door and propagates into the vehicle interior can be obtained, and the position of the portable device 2 outside the vehicle interior can be correctly determined. When the vehicle interior antenna 6 is mounted at a position higher than the vehicle exterior antenna 3, the shielding effect by the driver's seat door cannot be obtained at a position higher than the door window.

  Furthermore, in consideration of the ease of mounting the antenna or the interior design of the vehicle 1, the mounting position of the other in-vehicle antenna 6 may be used outside the vehicle within a range of less than 20% of the wavelength of the radio signal using the in-vehicle antenna 6. You may attach in the position shifted from the antenna 3 back and forth in the vehicle advancing direction. Even at the position where the in-vehicle antenna 6 is attached, it is possible to obtain a radio wave shielding effect by the vehicle body, and to correctly determine the position inside and outside the vehicle of the portable device.

The outside antenna 4 and the inside antenna 7 are attached to the passenger door, and are mounted in the same manner as the outside antenna 3 and the inside antenna 6 attached to the driver's seat door. The vehicle exterior antenna 5 and vehicle interior antenna 8 are attached to the outside and inside of the trunk door of a sedan type vehicle. In the one-box type vehicle type, the outside antenna 5 is attached to the outside of the hatchback door, and the inside antenna 8 is attached to the inside of the vehicle.
In the above description, the configuration in which the vehicle-mounted antennas are attached to the driver seat door, the passenger seat door, and the rear door has been described. But you can.

FIG. 4 is a block diagram showing device configurations of the detector 9 and the ECU 12. Since the internal structures of the detector 10 and the detector 11 are the same, the internal configuration of these detectors 10 and 11 is omitted in FIG.
In FIG. 4, the detector 9 includes amplifiers 91 and 92, bandpass filters 93 and 94, detectors 95 and 96, and data transmission means 97. The amplifier 91 is an amplifier that amplifies the signal from the vehicle antenna 3, and the amplifier 92 is an amplifier that amplifies the signal from the vehicle antenna 6. The band filters 93 and 94 are band pass filters that receive signals amplified by the amplifiers 91 and 92, respectively, and transmit only a predetermined frequency band. The detectors 95 and 96 are detectors for calculating reception strengths at the vehicle exterior antenna 3 and the vehicle interior antenna 6 on the basis of the signals output from the bandpass filters 93 and 94. This is means for transmitting the signal intensity data detected by the detectors 95 and 96 to the ECU 12.

  The ECU 12 includes a determination unit 121 and a vehicle control unit 122. The determination unit 121 is a unit that determines whether the portable device 2 is inside or outside the vehicle based on the received intensity data transmitted from the detectors 9 to 11, and the vehicle control unit 122 is a vehicle inside / outside determination of the determination unit 121. It is a control means which performs door lock cancellation | release (or locking) by the result. The output signal 122 a is a command signal that is output from the vehicle control means 122 and locks (locks) or unlocks (unlocks) the vehicle door, and the input signal 122 b is input to the vehicle control means 122. This is a signal for transmitting that the start switch 15 or the door lock release switch 16 has been pressed (becomes ON).

  The radio signal transmitted by the portable device 2 is received by the vehicle exterior antenna 3 and the vehicle interior antenna 6 and is amplified to a predetermined level by the amplifiers 91 and 92, respectively. The output signals of the amplifiers 91 and 92 are subjected to filtering by removing noise components in unnecessary bands with the band-pass filters 93 and 94 having a wireless communication frequency of 315 MHz as a pass frequency, and the detectors 95 and 96 calculate the signal strengths of the respective signals. . That is, the signal strengths of the radio signals received by the vehicle exterior antenna 3 and the vehicle interior antenna 6 are calculated by the detectors 95 and 96, respectively. There are various configurations of the detectors 95 and 96 for calculating the received intensity. As an example, a device configuration to which an I / Q detection circuit is applied will be described.

FIG. 5 is a block diagram showing a device configuration of the detector 95. Since the detector 96 and the internal structures of the detectors 10 and 11 are the same, only the configuration of the detector 95 is shown.
As shown in FIG. 5, the detector 95 includes an internal oscillator 951, multipliers 952 and 953, phase shifters 954, low-pass filters 955 and 956, and an arithmetic unit 957.
The internal oscillator 951 generates a detection signal (sine wave signal) having the same frequency as the radio signal transmitted from the portable device 2. Next, a multiplier 952 multiplies the radio signal received by the vehicle antenna 3 or the vehicle antenna 6 and passed through the amplifiers 91 and 92 and the band filters 93 and 94 and the detection signal generated by the internal oscillator 951. The harmonic component of the multiplied waveform is removed by the low-pass filter 955, and an In-Phase signal component (hereinafter referred to as I component) is output. Further, the detection signal that has been rotated 90 degrees by the phase shifter 954 and the radio signal are multiplied by the multiplier 953, and the harmonic component of the output signal is removed by the low-pass filter 956, and the Quadrature-Phase signal component (hereinafter referred to as the quadrature-phase signal component). , Called Q component). The computing unit 957 calculates Sqrt (I component ² + Q component ² ) by using the I component and the Q component as inputs, and calculates the signal strength of the received radio signal.
The detectors 95 and 96 may be configured to calculate signal intensity using a circuit such as a rectifier circuit (full wave rectification, half wave rectification) using a diode or a logarithmic amplifier circuit in addition to such I / Q detection. Good.

FIG. 6 is a flowchart for explaining a series of operations from the door locked state of the vehicle 1 to the door lock unlocking, and shows a processing procedure of the determination means 121 built in the ECU 12.
First, in step ST100, the door of the vehicle 1 is in a locked state, and the user holding the portable device 2 is located outside the vehicle 1. A user who has the portable device 2 approaches the vehicle 1 and pulls the door knob of the vehicle 1 to open the door or presses the door lock release switch 16 installed on the door knob. A signal 122b) is transmitted to the ECU 12. Since the door switch signal is turned ON in step ST101, the processing procedure next moves to step ST102.

  In step ST <b> 103, the ECU 12 transmits an activation radio signal from the data communication antenna 13 to activate the portable device 2. Normally, the portable device 2 stops the circuit operation of the radio signal function for transmitting key information in order to suppress battery consumption. The portable device 2 that has received the activation wireless signal modulates the key information recorded in its own memory as a response and transmits the modulated key information to the in-vehicle wireless device as a wireless signal. On the other hand, in step ST103, the in-vehicle wireless device receives the wireless signal transmitted from the portable device 2 by the vehicle antennas 3 to 5 and the vehicle antennas 6 to 8, and the detectors 9 to 11 measure the reception strength of the wireless signal. To do. The transmission / reception means 14 demodulates key information included in the radio signal from the portable device 2.

  Next, in step ST104, it is determined whether the received intensity of the radio signal from the received portable device 2 is equal to or greater than a predetermined value (threshold value). The reception intensity used for the determination is the highest reception intensity of the vehicle antennas 3 to 5. If the reception intensity is greater than or equal to the threshold, the process proceeds to step ST105.

  In step ST105, it is confirmed whether the key information of the portable device 2 and the key information registered in the vehicle 1 match. It is confirmed that the user possessing the portable device 2 is a legitimate user of the vehicle 1 by matching the key information. In step ST104, when the reception strength is not equal to or greater than the threshold, the processing procedure in FIG. 6 describes the flow to return to step ST100, but the process returns to the transmission of the activation radio signal for calling the portable device in step T102. It is good also as a structure which performs the procedure of step ST104 in multiple times. Similarly, when the key information from the portable device 2 does not match at step ST105, the procedure from step ST102 to step ST104 may be executed a plurality of times.

  In step ST106, the door position where the door lock release switch 16 is turned on and the vehicle antenna position where the reception intensity of the radio signal of the portable device 2 received by the vehicle antennas 3 to 5 is the highest are confirmed. For example, if the determination in step ST106 is not made, the authorized user who has the portable device 2 is in the passenger compartment outside the passenger compartment side, and the malicious third party unlocks the door from the driver seat side outside the passenger compartment area. When an operation is performed, the door unlock condition is established with the portable device 2 in the passenger compartment side area on the passenger seat side, and the driver's seat door is unlocked so that a malicious third party can enter the vehicle interior. Become. In step ST106, it is possible to determine which door the portable device 2 existing outside the vehicle cabin is located near. Thereby, the door to be unlocked can be limited, and the crime prevention effect can be improved. If the door position where the door lock release switch 16 is ON coincides with the position of the outside antenna having the highest reception intensity, the process proceeds to the next step ST107.

  Step ST107 compares the reception strength of the vehicle antenna with the highest reception strength among the vehicle exterior antennas 3 to 5 with the reception strength of the vehicle interior antennas 6 to 8 installed in the vehicle interior. Perform indoor / outdoor judgment. If the reception intensity of the outside antenna is greater than the reception intensity of the inside antennas 6 to 8, it is determined that the portable device 2 exists outside the passenger compartment together with the user, and the door lock is released in step ST108. On the contrary, if the reception strength of the in-vehicle antennas 6 to 8 is large, it is determined that the portable device 2 does not exist outside the vehicle compartment together with the user, and the portable device 2 may be left in the vehicle interior. The door lock is not released.

FIG. 7 is a flowchart for explaining a series of operations from the engine stop state of the vehicle 1 to the engine start, and shows a processing procedure of the determination means 121 built in the ECU 12.
First, in step ST200, the engine of the vehicle 1 is in a stopped state. A user holding portable device 2 pushes engine start switch 15 for starting the engine, and a switch signal (input signal 122b) is transmitted to ECU 12. In step ST201, it is determined that the engine start switch 15 is turned on, and the processing procedure proceeds to the next step ST202.
In step ST202, an activation radio signal is transmitted from the data communication antenna 13 to activate the portable device 2. The portable device 2 that has received the activation wireless signal modulates the key information recorded in its own memory as a response, and transmits the modulated key information to the in-vehicle wireless device. In the in-vehicle wireless device, the wireless signal from the portable device 2 is received by the vehicle antennas 3 to 5 and the vehicle antennas 6 to 8.

  Next, step ST203 measures the received intensity with the detectors 9-11 based on the received radio signal of the portable device 2. The transmission / reception means 14 demodulates key information included in the wireless signal of the portable device 2. In step ST204, it is determined whether or not the received intensity of the received wireless signal of the portable device 2 is equal to or greater than a predetermined value (threshold value). In step ST205, it is determined whether the key information of the portable device 2 matches the key information registered in the ECU 12. When the key information matches, it is determined that the user who holds the portable device 2 and presses the engine start switch 15 is the authorized user of the vehicle 1.

In step ST206, the reception strength of the in-vehicle antenna having the highest reception strength among the in-vehicle antennas 6 to 8 is compared with the reception strength of the in-vehicle antennas 3 to 5 installed outside the passenger compartment, and the interior of the portable device 2 The outside position is determined. If the reception intensity of the vehicle interior antenna is greater than the reception intensity of the vehicle exterior antennas 3 to 5, it is determined that the portable device 2 is present in the vehicle interior together with the user. Conversely, if the reception intensity at the vehicle interior antenna is smaller than the reception intensity at the vehicle exterior antennas 3 to 5, it is determined that the portable device 2 exists outside the vehicle compartment.
Another processing procedure of the vehicle interior / exterior determination in step ST206 includes a process of taking the majority decision of the vehicle interior / exterior determination result (individual determination result) and using the most frequent determination result as the final determination result.

FIG. 8 is a flowchart for explaining the contents of the majority decision process.
As described above, the in-vehicle antennas 3 to 5 and the in-vehicle antennas 6 to 8 installed in pairs across the vehicle door in the present embodiment are the in-vehicle antenna 3 and the in-vehicle antenna installed in the driver's seat door as described above. The antenna 6, the vehicle exterior antenna 4 and the vehicle interior antenna 7 installed at the passenger door, and the vehicle exterior antenna 5 and vehicle interior antenna 8 installed at the drunk door.

First, in step ST300, the majority data that is the individual determination result is cleared to zero. Next, in step ST301, if the vehicle interior / exterior determination result based on the reception strength of the vehicle exterior antenna 3 and the vehicle interior antenna 6 installed at the driver's seat door is a vehicle interior determination, 1 is added to the majority data in step ST302 and step ST303. Migrate to On the other hand, if it is determined outside the vehicle in step ST301, the process directly proceeds to step ST303.
In step ST303, if the vehicle interior / exterior determination result based on the reception strength of the vehicle exterior antenna 4 and the vehicle interior antenna 7 installed in the passenger seat door is a vehicle interior determination, 1 is added to the majority data in step ST304, and the process proceeds to step ST305. Transition. If the determination is outside the vehicle, the process directly proceeds to step ST305.
In step ST305, if the vehicle interior / exterior determination result based on the reception strength of the vehicle exterior antenna 5 and the vehicle interior antenna 8 installed in the rear door is a vehicle interior determination, 1 is added to the majority data in step ST306 and the process proceeds to step ST307. . If the determination is outside the vehicle, the process directly proceeds to step ST307.
If the value of the majority data is 3 or 2 in step ST307, it is finally determined that the portable device 2 exists in the passenger compartment as a result of the majority decision. Conversely, if the majority data is 1 or 0, it is finally determined that the portable device 2 exists outside the passenger compartment as a result of the majority determination.

FIG. 9 is a diagram illustrating the relationship between the determination result of the antenna inside and outside the vehicle installed at each door and the majority determination result.
The determination data used for majority decision in the present embodiment includes the inside / outside determination result obtained from the reception strengths of the outside antenna 3 and the inside antenna 6 installed in the driver's seat door, the outside antenna 4 installed in the front passenger door and the inside of the vehicle. These are the inside / outside determination result obtained from the reception strength of the vehicle antenna 7 and the inside / outside determination result obtained from the reception strength of the vehicle exterior antenna 5 and the vehicle interior antenna 8 installed in the drunk door. Therefore, the combination of the determination results of the antennas inside and outside the vehicle installed in each door is 8 cases, the value of the majority data shown in FIG. 9 is 2 or more, and it is determined that the portable device 2 exists in the vehicle interior, and the value of the majority data is If it is 1 or less, it is determined that the configuration machine 2 exists outside the passenger compartment.

  The inside / outside determination processing by majority decision is effective as a means for solving the problem of multipath fading described below. The problems and effects will be described. In the vehicle interior / exterior determination of the portable device 2 that compares the reception intensities of the vehicle exterior antenna and the vehicle interior antenna, a decrease in the reception strength due to multipath fading becomes an erroneous determination factor for the interior / exit determination. This multipath fading means that radio waves (direct waves and reflected waves) having different propagation paths interfere with each other and the reception intensity varies. In particular, when the direct wave and the reflected wave have opposite phases and are received by the antenna, the reception intensity is greatly reduced. When the reception strength is reduced due to multipath fading, even when the portable device 2 is in the vehicle interior, the reception strength at the in-vehicle antenna is reduced and the reception strength of the outside antenna is relatively strong. For this reason, the problem is that the intensity difference is reversed, leading to an erroneous determination of the inside / outside determination. For example, although the portable device 2 is in the passenger compartment, the reception intensity at the in-vehicle antennas 6 to 8 installed inside the driver's seat door (inside the passenger compartment) is reduced due to the influence of multipath fading. In particular, the reception intensity at the outside antennas 3 to 5 increases, and it is determined that the portable device 2 exists outside the passenger compartment by comparing the reception intensity.

  As a measure for avoiding a decrease in reception strength due to multipath fading, there is a utilization of physical characteristics that eliminate the influence of multipath fading at a location that is a half wavelength or more away from the radio signal. For example, even if the reception intensity at the vehicle interior antenna 6 inside the driver's seat door decreases due to multipath fading, the vehicle interior antenna 7 installed inside the passenger seat door or the vehicle interior antenna 8 installed inside the rear door. However, there is no reduction in reception strength due to multipath fading.

  By performing the inside / outside determination process by majority decision, multipath fading occurs in any one of the in-vehicle antennas 6 to 8, and even if an erroneous determination is made that the portable device 2 is outside the vehicle compartment, Since the in-vehicle antenna can correctly determine the portable device 2 as the vehicle interior, the final determination can correctly determine that the portable device 2 exists in the vehicle interior.

  If it can be determined in step ST206 that the portable device 2 is present in the passenger compartment, the engine start is permitted in step ST207 and the engine is started. If it is determined in step ST206 that the portable device 2 exists outside the vehicle compartment, the portable device 2 does not exist with the user in the vehicle interior, so the engine is not started.

  As described above, according to the vehicle radio apparatus of the first embodiment, in a vehicle radio apparatus including a portable device having a wireless communication function and an in-vehicle wireless device that performs wireless communication with the portable device, The wireless devices are installed so as to be paired inside and outside with the vehicle body in between, and each is received by the vehicle antenna and vehicle antenna that receive radio signals from the portable device, and the vehicle antenna and vehicle antenna. The detection means for calculating the signal strength of the radio signal from the portable device and the signal strength of the vehicle antenna calculated by the detection device are compared with the signal strength of the vehicle antenna, and the portable device is present either inside or outside the vehicle interior. Determination means for determining whether or not the interior of the portable device is inside or outside the vehicle can be accurately determined.

  In addition, according to the vehicle radio apparatus of the first embodiment, three or more pairs of vehicle exterior antennas and vehicle interior antennas are installed, and the determination means compares the reception strengths of the paired vehicle exterior antennas and vehicle interior antennas. Since each result is an individual determination result and a majority decision is made using three or more individual determination results, an erroneous determination due to a decrease in reception intensity due to multipath can be avoided, and the mobile vehicle The accuracy of indoor / outdoor position determination can be improved.

  Further, according to the vehicle radio apparatus of Embodiment 1, the vehicle antenna and the vehicle antenna are installed on both sides of the metal surface at a position where the distance between the metal surface and each antenna is closer than 10% of the wavelength used for the radio signal. Thus, the radio wave shielding effect by the vehicle body can be obtained, and the position of the portable device inside and outside the vehicle can be determined with higher accuracy.

  In addition, according to the vehicle radio apparatus of the first embodiment, a plurality of pairs of the vehicle exterior antenna and the vehicle interior antenna are installed across the both side doors and the rear door of the vehicle. The position of the portable device inside and outside the vehicle interior can be accurately determined in all regions outside and inside the vehicle interior, including the side and the vehicle rear, and the front and rear of the vehicle interior area.

Embodiment 2. FIG.
In the determination of the inside / outside of the portable device that compares the reception strengths of the antenna for vehicle exterior and the antenna for vehicle interior, a decrease in reception strength due to multipath fading becomes an erroneous determination factor for interior / exterior determination. When the reception strength is reduced due to multipath fading, even when the portable device is outside the vehicle, the reception strength of the vehicle-mounted antenna for the vehicle decreases, and the reception strength of the vehicle-mounted antenna for the vehicle becomes relatively strong. Therefore, the intensity difference is reversed, which may lead to an erroneous determination of the inside / outside determination.
Therefore, in the second embodiment, the vehicle antenna is configured to receive vertical polarization and horizontal polarization, and the reception intensity at the vehicle antenna is set to the higher polarization reception intensity. The overall basic configuration of the vehicle radio apparatus according to the second embodiment is the same as that of the first embodiment shown in FIGS. 1 and 2, and thus the description of the entire configuration is omitted.

FIG. 10 is a block diagram showing a device configuration of detector 9a and ECU 12a in the vehicle radio apparatus of the second embodiment of the present invention. In addition, since the internal structure of the detector 10a and the detector 11a is the same, illustration of those internal structures is omitted.
In FIG. 10, antennas 3 a to 5 a and 3 b to 5 b for outside the vehicle are antennas that are installed outside the vehicle 1 and receive wireless communication of the portable device 2. The in-vehicle antennas 6 to 8 are antennas that are installed in the vehicle interior of the vehicle 1 and receive wireless communication from the portable device 2. The configuration of the in-vehicle antennas 6 to 8 is the same as that of the first embodiment. The outside antennas 3a to 5a are antennas that selectively receive vertical polarization with respect to the radio signal of the portable device 2, and the outside antennas 3b to 5b select horizontal polarization with respect to the radio signal of the portable device 2. It is an antenna that receives automatically. The amplifiers 91a and 91b, the band filters 93a and 93b, and the detectors 95a and 95b have configurations corresponding to the signal from the vehicle antenna 3a and the signal from the vehicle antenna 3b, respectively. This is the same as the amplifier 91, the band filter 93, and the detector 95 in the first embodiment. The amplifier 92, the band filter 94, and the detector 96 are the same as those in the first embodiment. The data transmission means 97 is means for transmitting the output signals of the detectors 95a, 95b, 96 to the ECU 12a.

  Further, the determination unit 121a in the ECU 12a is a determination unit that determines whether the portable device 2 is inside or outside the vehicle based on the signal strength data transmitted from the detectors 9a to 11a. The basic function of the determination unit 121a is that of the first embodiment. Similar to the determination unit 121, the signal strengths from the vehicle antennas 3a to 5a and 3b to 5b are the vehicle antennas 3a to 5a that receive vertical polarization and the vehicle antennas 3b to 3b that receive horizontal polarization. The difference is that the one with the larger reception strength in 5b is selected. The vehicle control means 122 of the ECU 12a is the same as that in the first embodiment.

  In radio signal propagation, reflected waves reflected by structures such as the ground, concrete walls, and ceilings are transmitted horizontally (vertically polarized waves) and vertically polarized waves, and the reflected waves have different intensities and are transmitted (or received) from an antenna. Since the horizontal polarization and the vertical polarization have different intensities, the degree of fluctuation in reception intensity due to multipath differs between the vertical polarization and the horizontal polarization. For example, even if the reception intensity due to multipath decreases in horizontal polarization, the reception intensity does not decrease due to multipath in vertical polarization. As a result, even if one of the polarized waves has a decrease in reception strength due to multipath fading, multipath fading is avoided in the other polarization, so select a value for a polarization with a high reception strength. By doing so, it is possible to prevent an internal / external determination error due to a decrease in reception strength.

  On the other hand, the radio signal transmitted by the portable device 2 existing in the in-vehicle area 20 is received by the in-vehicle antennas 6, 7, 8. For example, when the reception strength at the in-vehicle antenna 6 is reduced due to the effect of multipath fading, the reception strength at the other in-vehicle antennas 7 and 8 is used to select the one with the highest reception strength, This is the representative value of the reception intensity at the vehicle antenna. Accordingly, it is possible to avoid a decrease in reception intensity due to multipath occurring in the vehicle interior area, and it is possible to improve the determination accuracy of the position of the portable device inside and outside the vehicle by comparing the reception intensity.

  As described above, according to the vehicle radio apparatus of the second embodiment, the vehicle exterior antenna has a configuration for receiving vertically polarized waves and horizontally polarized waves. Therefore, it is possible to avoid erroneous determination due to a decrease in reception strength due to multipath, and to improve the determination accuracy of the position of the portable device inside and outside the vehicle.

Embodiment 3 FIG.
FIG. 11 is a block diagram showing the device configuration of detectors 9b to 11b and ECU 12b for explaining the vehicle radio apparatus of the third embodiment of the present invention. The overall configuration of the vehicle radio apparatus is the same as that of the first embodiment. The internal structure of the detectors 10b and 11b is the same as that of the detector 9b.
In FIG. 11, an oscillator 98 is an oscillator that generates a sine wave having the same frequency as the radio signal of the portable device 2. The detectors 99 and 100 are detectors that calculate the phase difference of the wireless signals received from the portable device 2. The data transmission means 97 is means for transmitting phase difference data, which is an output signal from the detectors 99 and 100, to the ECU 12b. Further, the determination unit 121b of the ECU 12b is configured to determine whether the portable device 2 is inside or outside the vehicle based on the phase difference data transmitted from the detectors 9b to 11b. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to corresponding portions, and descriptions thereof are omitted.

The radio signal transmitted by the portable device 2 is received by the vehicle exterior antenna 3 and the vehicle interior antenna 6 and is amplified to a predetermined level by the amplifiers 91 and 92, respectively. Next, the output signals of the amplifiers 91 and 92 are filtered by the band filters 93 and 94 to remove unnecessary noise components in the band using a wireless communication frequency of 315 MHz as a pass frequency.
The phase data of the radio signals received by the vehicle exterior antenna 3 and the vehicle interior antenna 6 are calculated by the detectors 99 and 100, respectively. The configuration of the detectors 99 and 100 for calculating the phase data uses the I / Q detector circuit described in FIG. 5 of the first embodiment. In this case, the arithmetic unit 957 in FIG. 5 calculates tan-1 (Q component / I component) by inputting the I component and the Q component, and calculates phase data of the received radio signal.

The determination unit 121b determines whether the portable device 2 is inside or outside the vehicle based on the phase data transmitted from the detectors 9b, 10b, and 11b. When the portable device 2 exists outside the passenger compartment, the phase data of the vehicle antennas 3 to 5 is delayed in phase from the phase data of the vehicle antennas 6 to 8. This depends on the propagation distance of the radio signal, and the propagation distance between the portable device 2 and the antennas 6 to 8 for the vehicle is shorter than the propagation distance between the portable device 2 and the antennas 6 to 8 for the vehicle. On the other hand, when the portable device 2 is present in the vehicle interior, the phase data of the vehicle antennas 3 to 5 is more advanced than the phase data of the vehicle antennas 6 to 8. In this way, by comparing the phase data at the vehicle interior antennas 6 to 8 and the phase data at the vehicle exterior antennas 3 to 5, the vehicle interior / exterior position of the portable device 2 is determined in the same manner as the reception intensity. Can do.
In the third embodiment, the operations other than using the phase data for the vehicle interior / exit determination of the portable device 2 are the same as those in the first embodiment, and thus the description of the other operations is omitted.

  As described above, according to the vehicle radio apparatus of the third embodiment, in a vehicle radio apparatus including a portable device having a wireless communication function and an in-vehicle wireless device that performs wireless communication with the portable device, The wireless devices are installed so as to be paired inside and outside with the vehicle body in between, and each is received by the vehicle antenna and vehicle antenna that receive radio signals from the portable device, and the vehicle antenna and vehicle antenna. Since the detection means for calculating the phase difference of the wireless signal from the portable device and the determination means for comparing the phase difference calculated by the detection means and determining whether the portable device exists inside or outside the vehicle interior, It is possible to accurately determine whether the portable device is inside or outside the vehicle.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or any component in each embodiment can be omitted. .

  DESCRIPTION OF SYMBOLS 1 Vehicle, 2 Portable machine, 3, 4, 5 Outside antenna, 6, 7, 8 Inside antenna, 9, 9a, 9b, 10, 10a, 10b, 11, 11a, 11b Detector, 12, 12a, 12b ECU, 13 Data communication antenna, 14 Transmission / reception means, 15 Engine start switch, 16 Door lock release switch, 17, 18, 19 Outside area, 20 Inside area, 21, 22, 23 Determination boundary, 91, 91a, 91b, 92 Amplifier, 93, 93a, 93b, 94 Band filter, 95, 95a, 95b, 99, 100 Detector, 97 Data transmission means, 98 Oscillator, 121, 121a, 121b Determination means, 122 Vehicle control means.

Claims (6)

In a vehicle radio apparatus including a portable device having a wireless communication function and an in-vehicle wireless device that performs wireless communication with the portable device,
The in-vehicle wireless device is
A vehicle antenna and a vehicle antenna, each of which is installed to make a pair inside and outside the vehicle body, each receiving a radio signal from the portable device;
Detection means for calculating a signal strength of a radio signal received from the portable device and received by the vehicle antenna and the vehicle antenna;
A vehicle radio comprising: a determination unit that compares the signal strength at the vehicle exterior antenna calculated by the detection unit with the signal strength at the vehicle interior antenna to determine whether the portable device exists inside or outside the vehicle interior. apparatus. Three or more pairs of antennas for outside the vehicle and antennas for inside the vehicle are installed,
The determination means compares the reception strengths of the paired vehicle antennas and vehicle antennas, makes each result an individual determination result, and makes a majority decision using the individual determination results at three or more locations. The vehicle radio apparatus according to claim 1.   The outside antenna has a configuration for receiving vertically polarized waves and horizontally polarized waves, and a receiving intensity of the outside antenna is set to a higher receiving intensity of the polarized waves. Item 3. The vehicle radio apparatus according to Item 2.   The antenna for vehicle exterior and the antenna for vehicle interior are installed on both sides of the metal surface at a position where the distance between the metal surface and each antenna is closer than 10% of the wavelength used for the radio signal. The vehicle radio apparatus according to any one of the above. In a vehicle radio apparatus including a portable device having a wireless communication function and an in-vehicle wireless device that performs wireless communication with the portable device,
The in-vehicle wireless device is
A vehicle antenna and a vehicle antenna, each of which is installed to make a pair inside and outside the vehicle body, each receiving a radio signal from the portable device;
Detecting means for calculating a phase difference between radio signals from the portable device received by the vehicle antenna and the vehicle antenna;
A vehicle radio apparatus comprising: a determination unit that compares the phase difference calculated by the detection unit and determines whether the portable device is inside or outside the vehicle interior.   The vehicle radio according to any one of claims 1 to 5, wherein a plurality of pairs of antennas for outside of the vehicle and antennas for inside of the vehicle are installed with both side doors and rear doors of the vehicle being sandwiched therebetween. apparatus.

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