JP6048162B2 - Vehicle locking system - Google Patents

Description

  The present invention relates to a vehicle locking system that controls the locking / unlocking of a vehicle door by specifying the position of the wireless communication device by communication between a portable wireless communication device and a control device.

  In recent years, a user has a portable wireless communication device (hereinafter referred to as a wireless key) such as a card type or a key holder type, and performs a contact operation or a push operation on an operation unit provided in a vehicle door or in the vicinity thereof. For example, a door lock system that automatically locks / unlocks a vehicle door when the vehicle is used has been put into practical use. This door lock system is highly convenient because it does not require the user to insert and rotate the machine key as in the past, and is particularly effective when the user is holding a load and both hands are closed. is there. In addition, a smart key system has been put into practical use in which a user can get on a vehicle with a wireless key and change the position of an ignition switch (hereinafter referred to as an IG switch) by pressing a button or the like. This contributes to improved vehicle operability.

  The door lock, unlock, and IG switch operations are effective when it is confirmed that a regular wireless key exists in the vicinity of the vehicle, for example, within a range of several meters and in the vehicle interior. For this reason, a control device for wireless key control (hereinafter referred to as a wireless key control device) mounted on the vehicle authenticates whether the wireless key is valid and specifies the position of the wireless key. It is a mechanism. The wireless key control device uses a door lock switch provided outside the door of the vehicle in order to prevent the wireless key from being closed when the wireless key is located in the vehicle interior, for example, by specifying the position of the wireless key. Control is performed such as invalidating the door lock operation or prohibiting engine start by IG switch operation when the wireless key is not in the passenger compartment.

  Patent Document 1 discloses a conventional vehicle locking system including three antennas arranged in a vehicle, a wireless key control device that transmits a call signal to a wireless key, and a wireless key that transmits a response signal in response to the call signal. A system is disclosed. In this vehicle locking system, the wireless key control device sequentially transmits a signal for measuring reception intensity from each of the three antennas as a calling signal, measures the reception intensity with the wireless key, and sends a response signal including the reception intensity. Send. The wireless key control device acquires the reception strength from the response signal, calculates the distance between each antenna and the wireless key based on the relational expression between the signal strength and the distance, and determines the wireless key based on the geometric calculation. Specify the position of.

JP 09-317288 A

  However, in the conventional vehicle locking system, the number of antennas that transmit the calling signal is determined to be, for example, three, etc. Therefore, in the case of a configuration in which the number of transmitting antennas is increased in a vehicle type having a large vehicle size, There has been a problem that the wireless key control device and the wireless key must be modified so that signals can be transmitted and received from the additional transmitting antenna. Thus, when a dedicated wireless key and a wireless key control device are manufactured for each vehicle locking system whose configuration changes according to the vehicle type, there is a problem that the manufacturing cost increases.

  In addition, the maximum number of transmission antennas that can be added in advance is set to support from small vehicles to large vehicles, and the reception intensity of signals transmitted sequentially from all the maximum number of transmission antennas can be measured with a wireless key. By setting a sufficient reception time, it seems that it is possible to cope with the case where the vehicle locking system is constructed with the number of transmitting antennas less than the maximum number. However, when the vehicle locking system is constructed with the number of transmitting antennas less than the maximum number, the reception time in the wireless key becomes unnecessarily long, and the user waits until the door is locked, unlocked and the engine is started thereafter. Therefore, there is a problem that the responsiveness to the operation is lowered and the user feels uncomfortable.

  In addition, for the user, although the location of the wireless key is only perceived as a delay in operation, no convenient control for the user is performed during this delay. There was also.

  The present invention has been made in view of such circumstances, and an object of the present invention is to cope with a change in the system configuration according to the vehicle type and to improve convenience by control using a wireless key. It is to provide a vehicle locking system that can be realized.

A vehicle locking system according to the present invention includes a locking device that electrically locks / unlocks a vehicle door, a portable wireless communication device, and a plurality of transmission antennas arranged in the vehicle. Transmitting means for transmitting a calling signal to be called, receiving means for receiving a response signal from the wireless communication device for the calling signal, and specifying the position of the wireless communication device based on the response signal received by the receiving means And a control device that performs control to lock / unlock the door by the locking device based on the position specified by the position specifying means, wherein the control device includes the wireless communication device. a control signal for controlling the operation, control commands the receiving a radio signal arriving continuously on one of the radio signal modulated by the control signal measures the reception intensity Output means for outputting the items, wherein the one of the radio signal modulated by the control signal output by said output means adds the same number of radio signals of the transmitting antennas to the call signal, transmitting the plurality Each of the plurality of radio signals includes a transmission control unit configured to control any one of the plurality of radio signals for each antenna and sequentially transmit from the plurality of transmission antennas. Receiving intensity measuring means for measuring the received intensity, transmitting means for transmitting the response signal to which information on the received intensity measured by the received intensity measuring means is added, demodulating means for demodulating the control signal from the one radio signal, And control means for controlling the operation of the device based on the control signal demodulated by the demodulating means.

In the present invention, a call signal for calling a wireless communication device is transmitted from the control device, a response signal from the wireless communication device is received by the control device, and the position of the wireless communication device is specified based on the response signal. The control device receives the radio signal that is received after the one radio signal modulated by the control signal , which is a control signal for controlling the operation of the radio communication device, by the output means, and measures the reception intensity. A control signal is transmitted to the paging signal, including one radio signal modulated by the control signal by the transmission control means, and the same number of radio signals as the number of transmission antennas is added to the paging signal. The wireless signal is made to correspond to any one of the wireless signals and sequentially transmitted from a plurality of transmission antennas. The wireless communication device measures the reception strength of each of the plurality of radio signals by the reception strength measuring means, transmits a response signal to which information on the reception strength is added by the transmission means, and controls from the one radio signal by the demodulation means. The signal is demodulated and the operation of the own device is controlled by the control means based on the control signal. As a result, the position of the wireless communication device is specified, and the wireless communication device is controlled based on the control signal, thereby improving convenience. In addition, since the control signal is a signal for instructing to receive the radio signal that arrives after the one radio signal and to measure the reception intensity, the radio communication device can be used when the number of radio signals increases. Correspondingly, the received intensity can be measured.

  The vehicle locking system according to the present invention is characterized in that the reception intensity measuring means corrects the reception intensity of the one radio signal by a duty ratio related to modulation of the radio signal.

  In the present invention, the received power of the one radio signal is corrected by the duty ratio relating to the modulation of the radio signal by the received intensity measuring means, thereby correcting the transmission power changed due to the modulation by the control signal. can do.

  In the vehicle locking system according to the present invention, the position specifying unit relates to the modulation of the radio signal using the reception strength related to the one radio signal among the reception strength information acquired from the response signal received by the reception unit. The correction is made according to the duty ratio.

  In the present invention, the position specifying means corrects the reception intensity related to the one radio signal out of the reception intensity information acquired from the response signal by the duty ratio related to the modulation of the radio signal. The transmission power changed due to the modulation can be corrected.

  In the vehicle locking system according to the present invention, the wireless communication device has a notification unit that notifies information related to a state of the in-vehicle device mounted on the vehicle, and the control signal output by the output means is the in-vehicle device. And instructing the notification unit to notify the information based on the information.

  In the present invention, the wireless communication device has a notification unit that notifies information related to the state of the in-vehicle device mounted on the vehicle, and the control signal output by the output means includes information related to the state of the in-vehicle device. Since the notification unit is instructed to notify the information based on the information, the information on the in-vehicle device is notified by the wireless communication device, and the convenience for the user is improved.

  In the vehicle locking system according to the present invention, the wireless communication device has a notification unit that notifies the remaining amount of power of the power source of the vehicle, and the control signal output by the output means includes the remaining power amount data, The notification unit is instructed to notify based on the data.

  In the present invention, the wireless communication device has a notification unit that notifies the remaining amount of power of the power source of the vehicle, and the control signal output by the output means includes data on the remaining amount of power, and the notification unit based on the data Therefore, the remaining power of the power source of the vehicle is notified by the wireless communication device, and the convenience for the user is improved.

  In the vehicle locking system according to the present invention, the control signal output by the output means is a signal for instructing to add the remaining power of the power source built in the wireless communication device to the response signal for transmission. And

  In the present invention, since the control signal output from the output means instructs to transmit the power remaining amount of the power supply built in the wireless communication device in addition to the response signal, the control device incorporates the wireless communication device. It is possible to grasp the remaining power amount of the power source.

  In the vehicle locking system according to the present invention, the plurality of transmission antennas are disposed at least in a driver seat portion and a passenger seat portion of the vehicle, and the doors of the driver seat portion and the passenger seat portion are used for locking / unlocking. An operation unit is provided, and when the operation unit provided on the door of the driver's seat is operated, the transmission control means transmits the one radio signal from a transmission antenna disposed in the passenger seat. When the operation unit provided on the door of the passenger seat portion is operated, the one radio signal is transmitted from a transmission antenna disposed in the driver seat portion. And

  In the present invention, the plurality of transmission antennas are disposed at least in the driver's seat portion and the passenger seat portion of the vehicle, and locking / unlocking operation portions are provided on the doors of the driver seat portion and the passenger seat portion. The transmission control means transmits the one radio signal from the transmission antenna disposed in the passenger seat portion when the operation section provided in the door of the driver seat portion is operated, and is provided in the door of the passenger seat portion. When the operated operation unit is operated, the one radio signal is transmitted from the transmission antenna arranged in the driver's seat. Thus, the one radio signal that is modulated by the control signal and whose transmission power is reduced is transmitted from the transmission antenna located at a position relatively distant from the position where the user having the wireless communication device operates the operation unit, The influence of the wireless signal on the position specification of the wireless communication device can be reduced.

  In the vehicle locking system according to the present invention, the plurality of transmission antennas are disposed at least at the rear portion of the vehicle, and an operation unit for switching the motor of the vehicle to the operating / non-operating state is a driver seat portion of the vehicle. The transmission control means is configured to transmit the one radio signal from a transmission antenna disposed at the rear portion when the operation unit is operated.

  In the present invention, the plurality of transmission antennas are arranged at least in the rear part of the vehicle, and an operation unit for switching the motor of the vehicle to the operating / non-operating state is provided in the driver's seat portion of the vehicle. The transmission control unit transmits the one radio signal from a transmission antenna arranged at the rear when the operation unit is operated. Thus, the one radio signal that is modulated by the control signal and whose transmission power is reduced is transmitted from the transmission antenna located at a position relatively distant from the position where the user having the wireless communication device operates the operation unit, The influence of the wireless signal on the position specification of the wireless communication device can be reduced.

  According to the present invention, a call signal for calling a wireless communication device is transmitted from the control device, a response signal from the wireless communication device is received by the control device, and the position of the wireless communication device is specified based on the response signal. The control device outputs a control signal for controlling the operation of the radio communication device by the output means, and includes one radio signal modulated by the control signal by the transmission control means, and the same number of radio signals as the number of transmission antennas. It is added to the paging signal, and one of a plurality of radio signals is made to correspond to each of a plurality of transmission antennas, and control for sequentially transmitting from the plurality of transmission antennas is performed. The wireless communication device measures the reception strength of each of the plurality of radio signals by the reception strength measuring means, transmits a response signal to which information on the reception strength is added by the transmission means, and controls from the one radio signal by the demodulation means. The signal is demodulated and the operation of the own device is controlled by the control means based on the control signal. Therefore, the location of the wireless communication device is specified, and the wireless communication device is controlled based on the control signal, thereby improving convenience.

It is a block diagram which shows the structure of the vehicle locking system which concerns on this Embodiment. It is a block diagram which shows the structure of the wireless key which concerns on this Embodiment. It is a schematic diagram for demonstrating the aspect which arrange | positions three transmission antennas in a vehicle. It is a schematic diagram for demonstrating the aspect which arrange | positions four transmission antennas to a vehicle. It is a schematic diagram for demonstrating transmission of a paging signal. It is a schematic diagram for demonstrating an example of the format of a response signal. It is a flowchart which shows the procedure of a door lock control process. It is a flowchart which shows the procedure of the engine starting control process of a vehicle. It is a flowchart which shows the procedure of the transmission control process of a calling signal. It is a flowchart which shows the procedure of the response control process in a wireless key. It is a chart which shows the example of the control command which a wireless key control device transmits. It is a schematic diagram for demonstrating the format of the response signal which a wireless key transmits corresponding to a transmission command.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. FIG. 1 is a block diagram showing a configuration of a vehicle locking system 1 according to the present embodiment, and FIG. 2 is a block diagram showing a configuration of a wireless key 3 according to the present embodiment. The vehicle 100 is equipped with various switches that accept user operations, various sensors that detect the state of the in-vehicle device, and various in-vehicle devices that operate based on the accepted operation. In the present embodiment, the vehicle 100 includes an IG switch 40, a door lock switch 41, a door opening / closing sensor 42, and the like as various switches and sensors as shown in FIG. The apparatus 52 etc. are provided. The in-vehicle control system 1 includes the above-described switch, sensor, in-vehicle device, a wireless key control device 2 that controls the in-vehicle device, and a wireless key 3, and performs door lock / unlock control of the vehicle 100, IG switch control, and the like. Do. The wireless key control device 2 functions as a control device in the present invention, and the wireless key 3 functions as a wireless communication device in the present invention.

  First, various switches and sensors will be described. The IG switch 40 is a push button switch or the like that starts the engine when the driver presses the button. The IG switch 40 is permitted to be switched when the wireless key 3 is authorized by an authentication process based on identification information performed between the wireless key control device 2 and the wireless key 3 as will be described later. The IG switch 40 is gradually switched to an OFF position, an accessory position (hereinafter referred to as an ACC position), an ON position, and an engine start position by a user's pressing operation (including a long pressing operation). The position here is not a physical position but a functional state.

  In general, an illumination device such as a headlight (not shown) and a door lock mechanism 51 are operable in the off position, and an audio output control device 52 (and a speaker 52a), a car navigation device (not shown), etc. are operated in the ACC position. It becomes possible to operate. In this way, only some of the in-vehicle devices with low power consumption can operate at the off position and the ACC position. On the other hand, in the on position, many in-vehicle devices such as a power assist window device, an air conditioner, a turn lamp, a wiper, and a meter device (not shown) can operate. Further, at the engine start position, the spark plug is ignited to start the engine, and after the engine starts, the engine returns to the on position. The wireless key control device 2 can acquire the position of the IG switch 40 by inputting an operation signal of the IG switch 40 (operation signal by pressing a button) to the input unit 23 described later. The IG switch 40 functions as an operation unit for switching the prime mover (engine) in the present invention to an operating / non-operating state.

  The door lock switch 41 is a contact type or mechanical type switch provided outside and inside each door for getting on and off the driver's seat, front passenger seat, rear seat, etc. in the vehicle 100. The lock operation is accepted and notified to the wireless key control device 2. By operating a switch provided on the outside of the door (for example, a door knob), the user can lock / unlock the door from the outside of the vehicle, and the inside of the door (for example, a side surface of the door inside the vehicle). By operating a switch provided in the vehicle, the user can perform a door locking / unlocking operation in the passenger compartment. The door lock switch 41 functions as an operation unit for locking / unlocking provided on the doors of the driver seat portion and the passenger seat portion in the present invention.

  The door opening / closing sensor 42 detects whether the door 4 provided in each of the driver's seat, the passenger seat, the rear seat, and the like of the vehicle 100 is in an open state or a closed state, and sends the detection result to the wireless key control device 2. give. The door opening / closing sensor 42 is realized by, for example, a switch that is turned on / off in accordance with the opening / closing of the door.

  Next, various in-vehicle devices will be described. The door lock mechanism 51 includes a mechanical mechanism for locking / unlocking each door of the vehicle 100, an actuator for electrically operating the mechanical mechanism, and the like. The door lock mechanism 51 operates the actuator in accordance with a binary control signal indicating lock / unlock output from the wireless key control device 2 based on an operation input of the door lock switch 41, thereby locking / unlocking the door. Lock. In FIG. 1, the form in which the door lock mechanism 51 is controlled by the wireless key control device 2 is shown, but a control device separate from the wireless key control device 2 may be provided for the door lock mechanism 51. The door lock mechanism 51 functions as a locking device in the present invention.

  The audio output control device 52 acquires an audio output control signal from the wireless key control device 2 and other in-vehicle devices (for example, a radio or a music player), and outputs the audio signal to the speaker 52a. The sound output control device 52 stores a predetermined chime sound and buzzer sound as a preset together with the sound number, and outputs an analog sound signal to the speaker 52a according to the sound number added to the notification command. The audio output control device 52 may be configured to acquire audio data together with the notification command, convert the acquired audio data into an analog audio signal, and output the analog audio signal to the speaker 52a. The audio output control device 52 operates based on the notification command output from the wireless key control device 2 even when the IG switch 40 is in the off position, and outputs an audio signal to the speaker 52a.

  Next, the wireless key control device 2 will be described. The wireless key control device 2 includes a CPU (Central Processing Unit) 20, a flash memory, a ROM 21 using a nonvolatile memory such as an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically EPROM), and a DRAM (Dynamic Random Access Memory). ), A RAM 22 using a memory such as an SRAM (Static Random Access Memory), an input unit 23 for receiving inputs of various switches and sensors, an output unit 24 for outputting control signals to various in-vehicle devices, and the wireless key 3 And a wireless communication unit 25 for performing wireless communication between them. The CPU 20, ROM 21, RAM 22, input unit 23, output unit 24, and wireless communication unit 25 are connected by a bus M and can input / output signals to / from each other. The CPU 20, ROM 21, RAM 22, input unit 23, output unit 24, wireless communication unit 25, and bus M may constitute a microcomputer.

  The ROM 21 stores a control program 21 a read and executed by the CPU 20 and identification information 21 b for mutual identification with the wireless key 3. The identification information 21b is, for example, ID (IDentifier) information of the wireless key 3, the ID number of the wireless key control device 2 itself, key information used for encryption processing, and the like. The RAM 22 temporarily stores information generated during the process of the CPU 20.

  An IG switch 40, a door lock switch 41, and a door opening / closing sensor 42 are connected to the input unit 23, and signals from these switches and sensors are input. A door lock mechanism 51 and an audio output control device 52 are connected to the output unit 24, and a control signal from the CPU 20 is output to these in-vehicle devices.

  The wireless communication unit 25 includes a transmission unit 25a, an antenna switching unit 25b, and a reception unit 25c, and performs wireless communication with the wireless key 3 possessed by the user inside and outside the vehicle 100. A plurality of transmission antennas 61, 62, 63, 64... And a reception antenna 7 are arranged in the vehicle 100, and the wireless communication unit 25 performs wireless communication using these antennas. In the following description, the transmission antennas 61, 62, 63, 64... Are described as the transmission antenna 61 or the like for the sake of brevity when collectively described. The transmitter 25a encodes the ID number and key information of the wireless key control device 2, the control signal, etc., and then has a function of modulating a carrier wave with the encoded signal, and generates a calling signal for calling the wireless key 3 And output to the antenna switching unit 25b. The antenna switching unit 25b switches the output destination of the call signal to one of the transmission antennas 61 and the like based on a command from the CPU 20. The receiving unit 25c is connected to the receiving antenna 7, and has a demodulation function for demodulating the ID number and key information of the wireless key 3 included in the response signal from the wireless key 3, and reception intensity information described later, Information acquired by demodulation is output to the CPU 20. The transmission unit 25a functions as a transmission unit included in the control device according to the present invention, and the reception unit 25c functions as a reception unit according to the present invention.

  Here, the arrangement of the transmission antenna 61 and the like will be described. FIG. 3 is a schematic diagram for explaining a mode in which three transmission antennas are arranged in the vehicle 100, and FIG. 4 is a schematic diagram for explaining a mode in which four transmission antennas are arranged in the vehicle 100. 3 and 4, the upper side of the page is the front of the vehicle 100, and the lower side of the page is the rear of the vehicle 100. In general, since the size and shape of the vehicle 100 vary depending on the vehicle type, the arrangement and the required number of the transmission antennas 61 and the like in the locking system 1 are different for each vehicle type. For example, the vehicle 100 shown in FIG. 3 is a vehicle model having a relatively short overall length, and by arranging three transmission antennas 61, 62, 63, the vehicle interior and the vehicle 100 can be several meters from the vehicle 100 to both sides and rearward. The area outside the vehicle is the communicable range. Specifically, the transmission antenna 61 is disposed in the right driver's seat portion of the vehicle 100, the transmission antenna 62 is disposed in the left passenger seat portion, and the transmission antenna 63 is disposed in the rear portion of the vehicle 100 (for example, the rear seat portion). ing. The receiving antenna 7 is arranged at a substantially central position of the vehicle 100 and receives a response signal from the wireless key 3 present at a position several tens of meters away from the vehicle 100. Therefore, the communicable range by the receiving antenna 7 is wider than the communicable range by the transmitting antennas 61, 62, 63. This is to improve the convenience of the user by widening the operable range of the remote control described later for the wireless key 3.

  On the other hand, since the vehicle 100 shown in FIG. 4 is a model having a relatively long overall length, a transmission antenna having the same transmission power of the paging signal output from the wireless communication unit 25 and the same specifications such as antenna gain is shown in FIG. Similarly, when three are arranged, the communicable range outside the vehicle at the left rear and right rear of the vehicle 100 becomes narrow. Therefore, in the embodiment shown in FIG. 4, the transmission antenna 61 and the like are added and four transmission antennas 61, 62, 63, 64 are arranged. Specifically, the transmission antennas 61 and 62 are arranged in the same manner as in the embodiment shown in FIG. 3, while the transmission antenna 63 is arranged at the rear of the vehicle 100 and the transmission antenna 64 is arranged at the center of the vehicle 100. For example, in a vehicle equipped with a three-row seat in which the overall length of the vehicle 100 is longer (a vehicle having two rear seats in the front and rear), the transmission antenna 63 is arranged on the rear row side of the rear seat, and the transmission antenna 64 is arranged on the front row side of the rear seat. To do. As described above, the vehicle locking system 1 uses the wireless communication unit 25 having the same transmission characteristics and the transmission antenna having the same specifications such as the antenna gain, and the applicable vehicle type by increasing or decreasing the number of the transmission antennas 61 or the like. Can be increased. Note that the reception antenna 7 is arranged at substantially the center position of the vehicle 100 as in FIG. 3, and receives a response signal from the wireless key 3 present at a position several tens of meters away from the vehicle 100.

  The CPU 20 executes the control program 21 a stored in the ROM 21 to cause each part of the wireless key control device 2 to function, and performs door lock / unlock control, IG switch control, and the like. In the course of these controls, the CPU 20 performs call signal transmission control processing, authentication processing as to whether or not the wireless key 3 is authorized, and position determination of the wireless key 3.

  CPU20 transmits the calling signal which calls the radio | wireless key 3 in the radio | wireless communication part 25 using the transmission antenna 61 grade | etc., When operation with respect to the switch provided outside the door among the door lock switches 41 is made. FIG. 5 is a schematic diagram for explaining the transmission of the calling signal. The paging signal is composed of the same number of radio signals S1, S2, S3, S4... As the number of wake-up signals, ID signals, transmitting antennas 61, etc. transmitted sequentially in time. In the following description, the radio signals S1, S2, S3, S4... Are expressed as a radio signal S1 or the like for the sake of brevity when collectively described. The wake-up signal is an unmodulated signal having a predetermined time length, and notifies the radio key 3 of the arrival of the calling signal. The ID signal is a modulated signal obtained by modulating a carrier wave with information such as the ID number of the wireless key control device 2 and key information. As a modulation method, various modulation methods such as amplitude modulation and phase modulation can be used. When the information transmission rate of the paging signal is low, amplitude modulation may be used. In addition, various methods can be used as a method for encoding information to be transmitted. By using the Manchester encoding method, a wireless communication system with high versatility and a low bit error rate can be constructed.

  The radio signal S1 and the like include at least one modulation signal modulated by a control signal output from the CPU 20, and signals other than the modulation signal are unmodulated signals. In the example shown in FIG. 5, the radio signal S3 is a modulated signal, and the other radio signals S1, S2, and S4 are unmodulated signals. The wake-up signal, ID signal, and radio signal S1 are transmitted from the transmission antenna 61, the radio signal S2 is transmitted from the transmission antenna 62, the radio signal S3 is transmitted from the transmission antenna 63, and the radio signal S4 is transmitted from the transmission antenna 64 in order. The transmission antenna is switched by the antenna switching unit 25b of the communication unit 25. The CPU 20 functions as an output means for transmitting a control signal and a transmission control means in the present invention.

  In addition, the radio signal S1 and the like are output as signals of substantially the same amplitude from the respective transmission antennas, but the radio signal S3 is modulated by the control signal, so that the transmission power is reduced by the signal duty. . For example, when the control signal is encoded by Manchester encoding, the signal duty is 50%, so the transmission power of the radio signal S3 is 50% of the other radio signals S1, S2, and S4.

  Now, in the present embodiment, the vehicle locking system 1 in which the number of standard transmission antennas is three, for example, and the number of transmission antennas can be increased in accordance with the vehicle type is considered. Since the standard vehicle locking system 1 transmits one radio signal from each of the three transmission antennas, the call signal includes radio signals S1 to S3. In the vehicle locking system 1 with one additional transmission antenna, the number of transmission antennas is four, and the call signals include radio signals S1 to S4. The wireless key control device 2 uses the wireless signal S3 transmitted third among the wireless signals to be transmitted as a wireless signal modulated by the control signal, and designates the number of subsequent wireless signals as the control signal. For example, the control signal is composed of 8 bits, the upper 4 bits are a control code (such as “0001”), and the lower 4 bits are values obtained by binarizing the number of radio signals (“0000”, “0001”, “0011”). The wireless key 3 demodulates the wireless signal S3 to acquire the control code and the number of subsequent wireless signals. If the wireless key 3 acquires “0000” as the number of wireless signals, the wireless key 3 performs authentication based on the information included in the calling signal and transmits a response signal, and if “0001” is acquired, further acquires the wireless signal S4. After that, authentication based on the information included in the calling signal is performed and a response signal is transmitted.

  When receiving a response signal from the wireless key 3, the CPU 20 performs authentication processing based on information included in the received response signal and specifies the position of the wireless key 3. The CPU 20 operates the door lock mechanism 51 based on the result of the authentication process and the position specification of the wireless key 3 to lock / unlock the door of the vehicle 100. The CPU 20 also performs wireless communication with the wireless key 3, authentication processing, position determination of the wireless key 3, etc., even when an operation is performed on the IG switch 40, and the position of the IG switch 40 is the ACC position, the ON position, Switch to the engine start position. The position specification of the wireless key 3 will be described later.

  Next, the wireless key 3 will be described. The wireless key 3 includes a CPU 30, a ROM 31 using a non-volatile memory such as flash memory, EPROM, and EEPROM, a RAM 32 using a memory such as DRAM and SRAM, an input unit 33 that accepts operation button inputs, and a display unit 34. And a wireless communication unit 35 for performing wireless communication with the wireless key control device 2. The CPU 30, ROM 31, RAM 32, input unit 33, display unit 34, and wireless communication unit 35 are connected by a bus N and can input / output signals to / from each other. The CPU 30, ROM 31, RAM 32, input unit 33, wireless communication unit 35, and bus N may constitute a microcomputer.

  The ROM 31 stores a control program 31 a read and executed by the CPU 30 and identification information 31 b for mutual identification with the wireless key control device 2. The identification information 31b is, for example, the ID number of the wireless key 3 itself, the ID number of the wireless key control device 2, and key information used for encryption processing. The RAM 32 temporarily stores information generated during the process of the CPU 30. A lock button 33a and an unlock button 33b are connected to the input unit 33, and signals from these operation buttons are input. The display unit 34 includes an LED (Light Emitting Diode), a liquid crystal display, and the like, and performs display based on a command from the CPU 30. The display unit 34 functions as a notification unit in the present invention.

  The wireless communication unit 35 includes a reception unit 35a, a reception intensity measurement unit 35b, and a transmission unit 35c. The receiving unit 35a receives the calling signal from the wireless key control device 2 by the receiving antenna 36, demodulates information included in the calling signal (ID number and key information of the wireless key control device 2, control signal, etc.), and Decode and output to CPU 30. The reception intensity measuring unit 35b measures the reception intensity of the radio signal S1 and the like, and outputs the reception intensity measurement values P1, P2, P3, P4. In the following description, the received strength measurement values P1, P2, P3, P4... Are described as the received strength measurement value P1 or the like for the sake of brevity when collectively described. The transmission unit 35 c transmits a response signal from the transmission antenna 37 based on the control signal from the CPU 30. The transmission unit 35c functions as a transmission unit included in the wireless communication apparatus according to the present invention, the reception intensity measurement unit 35b functions as a reception intensity measurement unit according to the present invention, and the reception unit 35a functions as a demodulation unit according to the present invention. The CPU 30 functions as control means in the present invention.

  The CPU 30 causes each part of the wireless key 3 to function by executing the control program 31 a stored in the ROM 31. CPU30 performs the authentication process based on the identification information 31b memorize | stored in ROM31, when the call signal from the wireless key control apparatus 2 is received in the wireless communication part 35 (In addition, description is abbreviate | omitted about the detailed procedure of an authentication process) To do). When the authentication is successful, the CPU 30 outputs a control signal instructing transmission of a response signal to the wireless communication unit 35. FIG. 6 is a schematic diagram for explaining an example of a response signal format. The response signal includes an ID signal and reception intensity information. The ID signal is a modulated signal obtained by modulating a carrier wave with information such as the ID number of the wireless key control device 2 and key information. The reception intensity information is a modulated signal obtained by modulating a carrier wave with the reception intensity measurement value P1 or the like. The wireless key control device 2 is encoded with information such as the ID number and key information, and the received strength measurement value P1, based on the Manchester encoding method, etc., so that the wireless is highly versatile and has a low bit error rate. A communication system can be constructed.

  In addition, when an operation signal for the lock button 33a / unlock button 33b is input to the input unit 33, the CPU 30 outputs a control signal for instructing transmission of a lock signal / unlock signal for remotely controlling the door of the vehicle 100. Output to the wireless communication unit 35. In response to this control signal, the wireless communication unit 35 transmits a wireless signal including identification information (such as the ID number and key information of the wireless key 3) and information indicating lock or unlock from the transmission antenna 37. Is received by the wireless key control device 2, the door of the vehicle 100 is locked / unlocked.

  Next, the position specification of the wireless key 3 performed by the CPU 20 of the wireless key control device 2 will be described. As described above, the response signal transmitted from the wireless key 3 includes the received intensity measurement value P1 and the like. In the vehicle locking system 1 of the standard specification, if the number of transmission antennas is 3, the response signal includes received intensity measurement values P1 to P3. The reception intensity measured with the wireless key 3 is inversely proportional to the square of the distance between the transmission antenna 61 and the wireless key 3 and decreases as the distance increases. Referring to FIG. 3, if each distance between wireless key 3 and transmission antenna 61 is L1 <L3 <L2, the received intensity measurement value included in the response signal is P1> P3> P2. However, the reception strength measurement value P3 relating to the wireless signal S3 is corrected by multiplying the reciprocal of the signal duty ratio by the reception strength measurement unit 35b of the wireless key 3 or the CPU 30, or similarly by the CPU 20 of the wireless key control device 2. It shall be corrected. For example, in the case of Manchester encoding, since the signal duty ratio is 50% as described above, correction is performed by doubling the received intensity measurement value P3. Referring to FIG. 4, if the distance between the wireless key 3 and the transmission antenna 61 is L1 <L4 <L2 <L3, the received intensity measurement value included in the response signal is P1> P4> P2>. P3.

  The CPU 20 obtains at least three measurement values among the reception intensity measurement values P1 and the like, and calculates the distance corresponding to the three measurement values among the distances L1, L2, L3, L4. The position of the wireless key 3 can be specified by performing calculation using the geometrical calculation from the calculated three distances. When all the measurement values such as the reception intensity measurement value P1 are obtained, a relatively small measurement value may not be taken into account or may be used for verification. By such position specification, whether the wireless key 3 is inside or outside the vehicle with the door of the vehicle 100 as a boundary is specified with a resolution of, for example, several centimeters.

  Further, the CPU 20 acquires the position of the wireless key 3 even when two measured values of the received intensity measured values P1 and the like are acquired as effective values larger than 0 and the other two measured values cannot be acquired as effective values close to 0. It is possible to specify. For example, in FIG. 4, when the received intensity measurement values P3 and P4 are acquired as valid measurement values, the CPU 20 assumes that the wireless key 3 is at a certain height from the ground, and at least the wireless key 3 is a vehicle. It can be specified that the position is away from 100. Further, the CPU 20 acquires one of the received intensity measurement values P1 and the like as an effective value larger than 0, and even when the other three measurement values cannot be acquired as effective values close to 0, the position of the wireless key 3 is It is possible to specify that the transmitting antenna corresponding to the effective measurement value is on the side where the transmitting antenna is disposed, and is located at a position away from the vehicle 100 by a certain distance. The CPU 20 of the wireless key control device 2 functions as position specifying means in the present invention.

  Next, door lock control by the vehicle locking system 1 will be described. FIG. 7 is a flowchart showing the procedure of the door lock control process, which is a process performed by the CPU 20 of the wireless key control device 2. The CPU 20 determines whether or not an operation has been performed on the door lock switch 41 provided on the outside of the door of the vehicle 100 (step S1). If the operation has not been performed (S1: NO), the operation on the switch is not performed. Wait until it is done.

  When an operation is performed on the door lock switch 41 (S1: YES), the CPU 20 determines whether all the doors of the vehicle 100 are closed based on a signal from the door opening / closing sensor 42 (step S2). . When any door of the vehicle 100 is in an open state (S2: NO), the CPU 20 ends the process.

  When all the doors of the vehicle 100 are closed (S2: YES), the CPU 20 performs transmission control of a call signal for calling the wireless key 3 (step S3). After transmitting the calling signal, the CPU 20 receives the response signal from the wireless key 3 in the wireless communication unit 25 (step S4), and the identification information (ID number and key information of the wireless key 3) included in the received response signal. Is subjected to authentication processing (step S5), and it is determined whether or not the authentication is successful (step S6). When the authentication is successful (S6: YES), the CPU 20 specifies the position of the wireless key 3 based on the reception strength information (reception strength measurement value P1 and the like) included in the response signal (step S7), and the authentication fails. In the case (S6: NO), the process is terminated.

  The CPU 20 determines whether or not the wireless key 3 exists outside the vehicle based on the result of specifying the position of the wireless key 3 in step S7 (step S8). When the wireless key 3 exists outside the vehicle (S8: YES), the CPU 20 outputs a control signal instructing locking or unlocking of the door to the door lock mechanism 51, and the door lock mechanism 51 performs all of the control signals based on the control signal. The door is locked / unlocked in a toggle manner (step S9), and the process ends. When the wireless key 3 is not outside the vehicle but in the vehicle interior (S8: NO), the CPU 20 outputs a notification command to the audio output control device 52 to inform the user that the wireless key 3 is in the vehicle interior. The output control device 52 sounds a notification sound (step S10), and ends the process without performing door lock / unlock control.

  Next, engine start control by the vehicle locking system 1 will be described. FIG. 8 is a flowchart showing a procedure of engine start control processing of the vehicle 100. The CPU 20 of the wireless key control device 2 determines whether or not an operation has been performed on the IG switch 40 provided in the vicinity of the driver's seat in the vehicle 100 (step S11), and when the operation on the IG switch 40 has not been performed. (S11: NO), it waits until operation with respect to IG switch 40 is made.

  When an operation is performed on the IG switch 40 (S11: YES), the CPU 20 performs transmission control of a call signal for calling the wireless key 3 (step S12). Whether the brake pedal of the vehicle 100 is depressed or the shift lever position of the vehicle 100 is “P (parking)” or “N (neutral)” before the CPU 20 performs transmission control of the calling signal. If the brake pedal is depressed and the position of the shift lever is “P” or “N”, step S12 may be executed.

  After transmitting the calling signal, the CPU 20 receives the response signal from the wireless key 3 in the wireless communication unit 25 (step S13), and the identification information (ID number and key information of the wireless key 3) included in the received response signal. Is subjected to authentication processing (step S14), and it is determined whether or not the authentication is successful (step S15). When the authentication is successful (S15: YES), the CPU 20 identifies the position of the wireless key 3 based on the reception strength information (reception strength measurement value P1 and the like) included in the response signal (step S16), and the authentication has failed. In the case (S15: NO), the process is terminated.

  CPU20 determines whether the wireless key 3 exists in a vehicle interior based on the position specification result of the wireless key 3 by step S16 (step S17). When the wireless key 3 is present in the vehicle interior (S17: YES), the CPU 20 outputs a control signal for instructing engine start to an engine starter (not shown), and the engine starter performs engine operation based on the control signal. Is started (step S18), and the process is terminated. When the wireless key 3 is not in the vehicle interior but outside the vehicle (S17: NO), the CPU 20 outputs a notification command to the audio output control device 52 to notify the user that the wireless key 3 is outside the vehicle, and outputs the audio. The control device 52 sounds a notification sound (step S19), and ends the process without starting the engine.

  Next, call signal transmission control in step S3 shown in FIG. 7 and step S12 shown in FIG. 8 will be described. FIG. 9 is a flowchart showing the procedure of the call signal transmission control process. The number of transmission antennas 61 and the like in the standard vehicle locking system 1 is k (k is a positive integer), and the number of transmission antennas 61 and the like in the vehicle locking system 1 in which the number of transmission antennas is increased according to the vehicle type ( n is a positive integer, n ≧ k). Also, the radio signal modulated by the control signal is transmitted k-th among the radio signals S1 and the like. In the standard vehicle locking system 1, the number of transmitting antennas 61 and the like is preferably three or more. First, the CPU 20 of the wireless key control device 2 determines the switching order of the transmission antenna 61 and the like in step S21.

  As for the switching order of the transmission antennas 61 and the like, the default values are set in the order of the transmission antennas 61, 62, 63, and 64, and the default values may be used unless particularly necessary. Further, when the user who has the wireless key 3 operates the door lock switch 41a (see FIG. 4) on the driver's seat side, the wireless signal modulated by the control signal from the transmission antenna 62 in the passenger seat portion considered to be far from the user. You may decide to transmit a signal. That is, the switching order of the transmission antenna 61 and the like is determined so that the transmission antenna 62 is k-th. Thereby, it is possible to reduce the contribution to the position specification of the wireless key 3 for the wireless signal whose transmission power is reduced due to the signal duty and to increase the position specifying accuracy. Similarly, when the user operates the door lock switch 41b on the passenger seat side (see FIG. 4), the antenna switching order is determined so that the transmission antenna 61 in the driver's seat portion which is considered to be far from the user becomes k-th. . Further, when the user operates the engine switch 40 (see FIG. 4), the antenna switching order is determined so that the transmission antenna 63 at the rear part of the vehicle 100 which is considered to be far from the user becomes k-th. Further, when the user operates a door lock switch (not shown) in the rear trunk, antenna switching is performed so that the transmission antenna 61 in the driver's seat or the transmission antenna 62 in the passenger's seat considered to be far from the user is k-th. The order is determined (step S21).

  After determining the antenna switching order, the CPU 20 outputs a control signal (step S22). The control signal is the number of signals following the control code. For example, the upper 4 bits are the control code “0001”, and the lower 4 bits are data obtained by binarizing the value of (nk). The control signal output from the CPU 20 is temporarily stored in the RAM 22. The CPU 20 sets the variable i to 1 (step S23), outputs a control signal instructing the antenna switching unit 25b to switch to the first transmission antenna having the antenna switching order, and switches the transmission antenna (step S24). ). The CPU 20 transmits a wake-up signal and an ID signal by the wireless communication unit 25 (step S25), and determines whether or not the variable i is equal to a k value indicating the number of standard transmission antennas (step S26). When the variable i is not equal to the k value (S26: NO), the CPU 20 outputs an unmodulated radio signal Si by the radio communication unit 25 and transmits it from the selected transmission antenna (step S28). CPU20 adds 1 to the variable i (step S29), and determines whether the variable i is larger than n value showing the number of transmission antennas in the vehicle locking system 1 (step S30). If the variable i is not greater than the n value, the CPU 20 outputs a control signal for instructing the antenna switching unit 25b to switch to the i-th transmission antenna in the antenna switching order to switch the transmission antenna (step S31). ), Returning to step S26, it is determined whether or not the variable i is equal to the k value.

  When the variable i is equal to the k value (S26: YES), the CPU 20 reads the control signal temporarily stored in the RAM 22, gives it to the wireless communication unit 25, and wirelessly modulated by the control signal in the transmission unit 25a of the wireless communication unit 25. The signal Si (in this case, the radio signal Sk) is output and transmitted from the selected transmission antenna (step S27). After transmitting the radio signal Sk in step S27, the CPU 20 proceeds to step S29 and adds 1 to the variable i. When the variable i becomes larger than the n value (S30: YES), the CPU 20 ends the calling signal transmission control and returns to the processing flow of the door lock control or the engine start control.

  Next, response control in the wireless key 3 will be described. FIG. 10 is a flowchart showing a response control processing procedure in the wireless key 3. In the wireless key 3, the number of transmission antennas 61 and the like in the standard vehicle locking system 1 is k, and it is known that the wireless signal modulated by the control signal is transmitted k-th in the wireless signal S1 and the like. It has become. On the other hand, the number n of transmission antennas 61 and the like in the vehicle locking system 1 with additional transmission antennas according to the vehicle type is unknown.

  The receiver 35a of the wireless key 3 receives the wakeup signal and the ID signal (step S41). When the wake-up signal is received, the CPU 30 is activated and the control process by the CPU 30 is started. An authentication process based on the identification information is performed from the ID signal received following the wakeup signal. In FIG. 10, it is assumed that the authentication process based on the ID signal is performed in step S41 and the authentication is successful. However, when the authentication fails, the process waits for the arrival of the wake-up signal and the ID signal. After step S41, the CPU 30 sets the variable i to 1 (step S42) and measures the reception intensity Pi at the reception intensity measurement unit 35b (step S43). The CPU 30 determines whether or not the variable i is a k value (step S44). If the variable i is not a k value (S44: NO), 1 is added to the variable i (step S45), and the reception intensity Pi is measured. repeat. When the variable i becomes the k value (S44: YES), the CPU 30 demodulates the control signal from the received signal and obtains the number m of subsequent signals (step S46). Here, m is the number (n−k) of additional transmission antennas included in the control signal.

  The CPU 30 sets the variable j to 1 (step S47), determines whether the variable j is greater than the m value (step S48), and if the variable j is not greater than the m value (S48: NO), the reception intensity The reception intensity Pk + j is measured by the measurement unit 35b (step S49). The CPU 30 adds 1 to the variable j (step S50), returns to step S48, and repeats the reception intensity measurement until the variable j becomes larger than the m value. When the variable j becomes larger than the m value (S48: YES), the CPU 30 ends the reception strength measurement and receives the reception strength information including the measured reception strength Pi (i = 1, 2,... N) and A response signal including the identification information is transmitted (step S51), and the response control is terminated.

  As described above, according to the present embodiment, the door lock mechanism 51 electrically locks / unlocks the door of the vehicle 100, and the door is based on the result of wireless communication between the wireless key 3 and the wireless key control device 2. Control to lock / unlock. The wireless key control device 2 transmits a call signal for calling the wireless key 3 from a plurality of transmission antennas 61 and the like arranged in the vehicle 100 by the wireless communication unit 25 and receives a response signal from the wireless key 3 for the call signal. To do. The CPU 20 of the wireless key control device 2 specifies the position of the wireless key 3 based on the received response signal, and performs control to lock / unlock the door by the door lock mechanism 51 based on the specified position. The CPU 20 outputs a control signal for controlling the operation of the wireless key 3, includes one wireless signal modulated by the control signal (for example, the wireless signal S3), and has the same number of wireless signals as the number of transmission antennas (such as the wireless signal S1). ) Is added to the paging signal, and one of a plurality of radio signals is made to correspond to each of the plurality of transmission antennas, and the transmission is sequentially performed from the plurality of transmission antennas. The wireless key 3 measures the reception strength of each of the plurality of wireless signals by the reception strength measuring unit 35b, transmits a response signal to which information on the reception strength is added by the transmission unit 35c, and transmits the response signal to the one wireless signal by the reception unit 35a. Demodulate the control signal from the signal. The CPU 30 of the wireless key 3 controls its own operation based on the control signal. As a result, the position of the wireless key 3 is specified, and the wireless key 3 is controlled based on the control signal to improve convenience.

  In addition, according to the present embodiment, the reception intensity measuring unit 35b of the reception key 3 corrects the reception intensity of the one radio signal with the duty ratio related to the modulation of the radio signal, so that the modulation by the control signal is performed. The changed transmission power can be corrected.

  Further, according to the present embodiment, the CPU 20 of the wireless key control device 2 uses the reception strength related to the one wireless signal among the reception strength information acquired from the response signal received by the reception unit 25c of the wireless communication unit 25. Since the correction is performed by the duty ratio relating to the modulation of the radio signal, the transmission power changed due to the modulation by the control signal can be corrected.

  Further, according to the present embodiment, the control signal output from the CPU 20 of the wireless key control device 2 receives the wireless signal that comes after the one wireless signal modulated by the control signal, and measures the reception intensity. Thus, the wireless key 3 can measure the reception intensity in response to an increase in the number of wireless signals. For example, even when transmission antennas are added to a standard vehicle locking system that includes three transmission antennas and transmits radio signals S1, S2, and S3 from each transmission antenna, the radio signals S1, S2, and S3 Then, the wireless signal transmitted subsequently can be received by the wireless key 3 and the reception intensity can be measured.

  Further, according to the present embodiment, the plurality of transmission antennas 61 and the like are disposed at least in the driver seat portion and the passenger seat portion of the vehicle 100, and the door lock switch 41a for locking / unlocking the doors of the driver seat portion and the passenger seat portion. And 41b (see FIGS. 3 and 4). When the door lock switch 41a provided on the door of the driver's seat is operated, the CPU 20 of the wireless key control device 2 transmits the one wireless signal from the transmission antenna 62 disposed in the passenger seat. When the door lock switch 41b provided on the door of the passenger seat portion is operated, the one radio signal is transmitted from the transmission antenna 61 arranged in the driver seat portion. Thus, the one radio signal that is modulated by the control signal and whose transmission power is reduced is a transmission antenna that is located at a position relatively distant from the position where the user who has the wireless key 3 operates the door lock switch 41a or 41b. The influence of the wireless signal on the position specification of the wireless key 3 can be reduced.

  Further, according to the present embodiment, the plurality of transmission antennas 61 and the like are disposed at least in the rear portion of the vehicle 100, and the IG switch 40 for switching the engine of the vehicle 100 to the operating / non-operating state is provided in the driver's seat portion of the vehicle 100. It has been. When the IG switch 40 is operated, the CPU 20 of the wireless key control device 2 transmits the one wireless signal from a transmission antenna (for example, the transmission antenna 63 shown in FIG. 3) arranged at the rear part. As a result, the one radio signal that is modulated by the control signal and whose transmission power is reduced is transmitted from the transmission antenna at a position relatively distant from the position where the user having the wireless key 3 operates the IG switch 40. The influence of the wireless signal on the position specification of the wireless key 3 can be reduced.

(Modification)
In the above-described embodiment, the control signal given to the wireless key 3 by the wireless key control device 2 by the wireless signal S1 or the like is a reception control command for instructing whether to receive the subsequent wireless signal. May be a command for informing the wireless key 3 of the remaining power amount of the in-vehicle power supply, a transmission command for transmitting the remaining power amount of the built-in power source of the wireless key 3, and the like. FIG. 11 is a chart showing an example of a control command transmitted by the wireless key control device 2.

  The CPU 20 of the wireless key control device 2 acquires the remaining power amount data from the in-vehicle power source (not shown), the control code “0010” indicating the notification command, and the remaining power amount data (for example, “1100”). ) Is transmitted as a control signal. The wireless key 3 displays the remaining power amount of the in-vehicle power source on the LED or the liquid crystal display of the display unit 34 based on the notification command. The notification command may be a command to notify the wireless key 3 of information related to the state of the in-vehicle device such as the lamp off state of the vehicle 100 and the door lock state, in addition to the remaining power amount of the in-vehicle power source. Good. Information on the in-vehicle device is notified by the wireless key 3, thereby improving user convenience. In particular, the power remaining amount of the in-vehicle power source is displayed on the display unit 34 of the wireless key 3 to prompt the user to replace the in-vehicle power source, and in an electric vehicle or a hybrid vehicle, to charge the in-vehicle power source. Convenience is improved.

  The CPU 20 of the wireless key control device 2 transmits a call signal including a control code “0101” indicating a transmission command as a control signal in order to transmit the remaining power of the built-in power source of the wireless key 3. FIG. 12 is a schematic diagram for explaining a format of a response signal transmitted by the wireless key 3 in response to a transmission command. The CPU 30 of the wireless key 3 acquires the remaining power amount of the built-in power supply based on the transmission command, and transmits a response signal including a response code “0101” for the transmission command and data (for example, “1000”) of the remaining power amount. . By receiving this response signal by the wireless key control device 2, the CPU 20 of the wireless key control device 2 can grasp the remaining power amount of the built-in power source of the wireless key 3, for example, the remaining power amount has decreased. In this case, a message prompting the user to replace the battery can be instructed to the voice output control device 52 to notify the user.

  Control signals representing these notification commands and transmission commands are transmitted by modulating any one of the radio signals S1 and the like with the control signals. When the above-described reception control command is assigned to a specific radio signal (for example, the radio signal S3) among the radio signals, the radio key control device 2 transmits a radio signal other than the specific radio signal (radio signals S1, S2, S4,. ..) May be transmitted by assigning a control signal representing a notification command and a transmission command. Further, the CPU 20 of the wireless key control device 2 may transmit a call signal that does not specify the position of the wireless key 3, and the reception control command described above is a specific wireless signal (for example, the wireless signal S3) among the wireless signals. Regardless of whether or not it is assigned), a control signal representing a notification command and a transmission command may be assigned to any one of the radio signals S1 and transmitted. When receiving a control signal other than such a reception control command, the wireless key 3 ends the reception of the calling signal, and performs display processing by the display unit 34 and transmission processing of a response signal.

  In the above-described embodiment, the CPU 20 of the wireless key control device 2 performs transmission control of the calling signal due to the user operating the door lock switch 41. However, the wireless key control device 2 The CPU 20 may periodically perform a call signal transmission control regardless of the operation of the door lock switch 41. Alternatively, the user may approach the vehicle 100 using an infrared sensor or the like, and automatically send a call signal. By transmitting such a call signal, the user who has the wireless key 3 approaches the vehicle 100 without operating the door lock switch 41, so that the control of unlocking the door of the vehicle 100 can be performed.

  The disclosed embodiments should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

100 vehicle 1 vehicle locking system 2 wireless key control device (control device)
20 CPU (position specifying means, output means, transmission control means)
25a Transmission unit (transmission means)
25c Receiver (Receiver)
3 Wireless key (wireless communication device)
30 CPU (control means)
34 Display (notification means)
35a Receiver (demodulation means)
35b Received strength measuring unit (received strength measuring means)
35c Transmission unit (transmission means)
40 IG switch (operation unit)
41 Door lock switch (operation part)
51 Door lock mechanism (locking device)
61, 62, 63, 64 Transmitting antenna

Claims (8)

A locking device that electrically locks / unlocks the door of the vehicle, a portable wireless communication device, and a transmission means for transmitting a calling signal for calling the wireless communication device from a plurality of transmission antennas arranged in the vehicle; Receiving means for receiving a response signal from the wireless communication device to the calling signal, and position specifying means for specifying the position of the wireless communication device based on the response signal received by the receiving means; In a vehicle locking system comprising a control device that performs control to lock / unlock the door by the locking device based on the position specified by
The controller is
A control signal for controlling the operation of the wireless communication device, and outputting a control signal for instructing to receive a wireless signal that comes after the one wireless signal modulated by the control signal and measure the reception intensity Output means,
Wherein said one radio signal modulated by the control signal output by the output means, the same number of radio signals of the transmitting antenna is added to the call signal, the plurality of radio for each of the plurality of transmit antennas A transmission control means for controlling any one of the signals and sequentially transmitting from the plurality of transmission antennas;
The wireless communication device is
Reception strength measuring means for measuring the reception strength of each of the plurality of radio signals;
Transmitting means for transmitting the response signal to which information on the received intensity measured by the received intensity measuring means is added;
A vehicle locking system comprising: demodulating means for demodulating a control signal from the one radio signal; and control means for controlling the operation of the vehicle based on the control signal demodulated by the demodulating means.   2. The vehicle locking system according to claim 1, wherein the reception intensity measuring means corrects the reception intensity of the one radio signal by a duty ratio related to modulation of the radio signal.   The position specifying means corrects the received intensity related to the one radio signal among the received intensity information acquired from the response signal received by the receiving means by a duty ratio related to modulation of the radio signal. The vehicle locking system according to claim 1. The wireless communication device has a notification unit that notifies information related to a state of an in-vehicle device mounted on the vehicle,
4. The control signal output by the output unit includes information related to a state of the in-vehicle device, and instructs the notification unit to notify the information based on the information. The vehicle locking system according to one. The wireless communication device has a notification unit that notifies the remaining amount of power of the power source of the vehicle,
4. The control signal output by the output unit includes data of the remaining power amount, and instructs the notification unit to notify the data based on the data. 5. The vehicle locking system according to.   4. The control signal output by the output means is a signal for instructing to add a remaining power amount of a power source built in the wireless communication device to a response signal and transmitting the response signal. The vehicle locking system according to any one of the above. The plurality of transmitting antennas are disposed at least in a driver seat portion and a passenger seat portion of the vehicle,
The operation part for locking / unlocking is provided in the door of the driver's seat part and the passenger's seat part,
The transmission control means transmits the one radio signal from a transmission antenna disposed in the passenger seat portion when the operation unit provided on the door of the driver seat portion is operated, and the passenger seat portion The radio signal is transmitted from a transmission antenna disposed in the driver's seat portion when an operation unit provided on the door is operated. 6. The vehicle locking system according to 6 . The plurality of transmitting antennas are disposed at least at the rear of the vehicle,
An operation unit for switching the prime mover of the vehicle to an operating / non-operating state is provided in a driver's seat portion of the vehicle,
It said transmission control means, when the operation section is operated, to claims 1 to 6, characterized in that the transmitting antenna disposed in said rear portion are so as to transmit radio signals of the one The vehicle locking system described.

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