JP2009033529A - Portable apparatus and communication control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To normally control equipment through radio communication between a receiver and a portable apparatus by effectively avoiding a communication trouble caused by noise without requiring large alteration at the receiver side. <P>SOLUTION: Disclosed is the receiver 20 which is carried by a user of a vehicle 1 and transmits a radio wave including a signal for controlling the equipment provided at the vehicle 1 to a communication controller 10 enabled to receive a radio wave of a frequency in a specified frequency band. The receiver includes a VCO 23 which receives the radio wave belonging to the specified frequency band and a mobile-phone side microcomputer 21 which specifies the frequency of the radio wave transmitted from the VCO 23. The mobile-phone side microcomputer 21 is configured to be set to a frequency f1 which belongs to the specified frequency band and a frequency f2 which belongs to the specified frequency band and at which there is not disturbance by noise belonging to the specified frequency band in the case that, when the radio wave of the frequency f1 is received by the communication controller 10, there is the disturbance by the noise. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable device that is possessed by a user of an object and performs wireless communication with a communication control device in order to control a device provided on the object, and a communication including the portable device and the communication control device. It relates to the control system.

  In recent years, in vehicles (objects) such as automobiles, there has been a strong demand for further improvements in the convenience of users of vehicles as well as further improvements in the security level (safety). For this reason, conventionally, two-way wireless communication is performed between a portable device (electronic key) possessed by the user and a communication control device (on-vehicle device) provided in the vehicle, and the wireless communication is established. There have been proposed communication control systems (electronic key systems) that automatically perform door locking / unlocking operations and enable engine start.

  Specifically, the communication control device transmits a request signal (radio wave) set in advance to the vehicle periphery or the vehicle compartment by a device-side transmission circuit (device-side transmission means) provided in the device, and transmits the request signal. Form an area. When the portable device enters the transmission area, the portable device receives a request signal by a portable device-side receiving circuit (portable device-side receiving means) provided in the portable device, and responds to the request signal. The ID code signal (radio wave) including the ID code stored in the memory of the portable device side microcomputer provided in the portable device side is transmitted to the communication control device by the portable device side transmission circuit (portable device side transmission means).

  When the communication control device receives this ID code signal by the device-side receiving circuit (device-side receiving means) provided in the device, the device-side microcomputer provided in the communication control device is stored in the memory. The ID code and the ID code included in the ID code signal are collated, and it is assumed that wireless communication with the portable device is established on the condition that the ID codes match each other, and the door lock of the vehicle can be locked and unlocked. Vehicle control is performed so that the engine can be started or the engine can be started.

  That is, bidirectional wireless communication is automatically performed between the portable device and the communication control device, and vehicle control is performed on the assumption that the wireless communication is established. For this reason, the user can automatically control the vehicle remotely using the communication control device without manual operation using a mechanical key or the like, and the convenience is improved. As a starting requirement, the security level of the vehicle is increased.

  By the way, in such a communication control system, if noise (radio wave) that interferes with communication between the portable device and the communication control device exists in the surrounding environment of the vehicle, a communication failure occurs, and the vehicle control described above cannot be performed normally. Specifically, when noise having a frequency fn (fn≈fi) substantially the same as the frequency fi of the radio wave including the ID code signal transmitted from the portable device exists in the surrounding environment of the vehicle (communication control device), the noise And the ID code signal from the portable device interfere with each other, and the reception level (selection ratio) of the ID code signal that should be originally received decreases.

Thus, when noise and the ID code signal from the portable device interfere with each other, for example, according to the technique disclosed in Patent Document 1, control is performed by the device-side microcomputer, and a plurality of frequencies received by the device-side receiving circuit are set. In association with the channel, the frequency is changed in units of several hundred kHz to several tens of MHz, and a frequency command signal including a channel code (frequency command code) is transmitted by the device-side transmission circuit in order to transmit the radio wave of the changed frequency from the portable device. To do. When the frequency command signal is received by the portable device-side receiving circuit, control is performed by the portable device-side microcomputer, and the frequency of the radio wave transmitted from the portable device-side transmitting circuit is set to a frequency corresponding to the channel code. Vehicle control is normally performed via the wireless communication.
JP 2007-142886 A

  However, according to this technology, in order to change the reception frequency in association with a plurality of channels on the device side reception circuit side, a local oscillation circuit or a BPF (Band Pass Filter) circuit is added, or a portable device Significant changes are required, such as the establishment of new transmission / reception frequency synchronization control between the device and the device-side receiving circuit.

  The present invention has been made to solve the above-mentioned problems, and its object is to provide a receiving means in a portable device that performs wireless communication with a predetermined receiving means in order to control a device provided on an object. A mobile device in which communication failure due to noise is effectively avoided and control of the device based on the wireless communication is normally performed without any change on the side, and a communication control system including the mobile device and receiving means It is to provide.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a radio wave that is possessed by a user of an object and includes a signal for controlling a device provided on the object is transmitted in a frequency in a specific frequency band. In a portable device that transmits to a predetermined receiving means that is capable of receiving a radio wave, a portable device-side transmission device that transmits a radio wave that belongs to the specific frequency band, and a frequency of the radio wave that is transmitted from the portable device-side transmission device are set And a frequency setting means for interfering with one frequency belonging to the specific frequency band and noise belonging to the specific frequency band when radio waves of the one frequency are received by the receiving means. In this case, the gist is that it can be set to another frequency that belongs to the specific frequency band and is not disturbed by the noise.

  According to this configuration, noise that interferes with wireless communication between the portable device possessed by the user of the object and the predetermined receiving means capable of receiving radio waves having a frequency in the specific frequency band is generated in the specific frequency band. The frequency of the radio wave belonging to the specific frequency band is disturbed by the noise even if the reception of the radio wave of the one frequency belonging to the specific frequency band is obstructed by the noise. It is set to other frequencies without. For this reason, wireless communication between the portable device and the receiving means is normally performed without being disturbed by noise. In addition, since the frequency range that can be received on the receiving means side remains the same as the specific frequency band originally set in the receiving means, there is no change on the circuit on the receiving means side. Simple circuit changes such as changing the capacitance of the capacitor on the side are sufficient.

  According to a second aspect of the present invention, in the portable device according to the first aspect, the frequency setting means can automatically change the respective frequencies, or each frequency can be set by a switch operation. The gist is that it can be changed.

  According to this configuration, wireless communication between the portable device possessed by the user of the object and the receiving means capable of receiving radio waves of a specific frequency band without impairing the convenience of the object user. Will surely be done.

  According to a third aspect of the present invention, the portable device according to the first or second aspect and the radio wave transmitted from the portable device are received, and the object is provided based on a signal included in the radio wave. The gist of the present invention is a communication control system including a communication control device that controls the devices.

  According to this configuration, in the communication control system that controls the device provided on the object based on the wireless communication performed between the portable device and the communication control device, no change is made on the communication control device side. The radio wave transmitted from the portable device is set to a frequency that is not disturbed by noise, and control of the device based on the wireless communication is normally performed.

  According to the present invention, in a portable device that performs wireless communication with a predetermined receiving unit in order to control a device provided on an object, communication failure due to noise can be effectively avoided without any change on the receiving unit side. Thus, control of the device based on the wireless communication is normally performed.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings.
As shown in FIG. 1 and FIG. 2A, the vehicle communication control system 30 according to the present embodiment includes a communication control device 10 provided in the vehicle 1 and having a wireless communication function, and a user of the vehicle 1. A portable device 20 that is carried and capable of two-way wireless communication with the communication control device 10 is provided.

<Configuration and Operation of Communication Control Device 10>
As shown in FIG. 1, the communication control device 10 includes a device-side microcomputer (device-side microcomputer) 11 composed of a CPU, a ROM, a RAM, and the like, and a device side connected to be controlled by the microcomputer 11. A device side transmission circuit 12 as a transmission means and a device side reception circuit 13 as a device side reception means are provided. The microcomputer 11 includes a non-volatile memory 11a, and a request code and an ID code unique to the vehicle 1 are stored in the memory 11a.

  The device-side transmission circuit 12 is configured to be able to transmit radio waves in a predetermined frequency band (here, 134 kHz in the LF band). When a request signal (transmission request signal) including the request code is input from the device-side microcomputer 11, the device-side transmission circuit 12 modulates the request signal into a radio wave in the frequency band, and sets a predetermined intermittent period and Send to outside with output strength.

  Specifically, the device-side transmission circuit 12 is controlled by the device-side microcomputer 11 and has an ID as an answerback signal from the portable device 20 at a specific frequency band (here, 31.150 MHz ± 0.125 MHz in the UHF band). In order to transmit the ID code signal including the code, as shown in FIG. 2 (a), the request signal is sent from the antenna installed in the door of the vehicle 1 and the vehicle interior to the outside detection area A1 and the vehicle in the vicinity of the vehicle 1 door. A call is sent to the indoor detection area A2. The device-side transmission circuit 12 is controlled by the device-side microcomputer 11 and intermittently sends WAKE signals at predetermined intervals to confirm the presence of the portable device 20 in the vehicle exterior detection area A1 and the vehicle interior detection area A2. It also comes to send.

The device-side receiving circuit 13 is configured to be able to receive a radio wave having a frequency in the specific frequency band via an antenna. Specifically, the device-side receiving circuit 13 is configured by a so-called superheterodyne receiver, and the reception frequency is 312 which is the center frequency f ₀ of the specific frequency band based on the frequency setting signal input from the device-side microcomputer 11. Set to 150 MHz. When receiving a signal (radio wave) in the specific frequency band coming from the portable device 20 or the like, the device-side receiving circuit 13 demodulates the signal and outputs it to the device-side microcomputer 11.

  The device-side microcomputer 11 is electrically connected to an engine switch 14 and a door lock device 15 and an engine control device 16 as devices to be controlled provided in the vehicle 1.

  The engine switch 14 is constituted by a push button switch device or the like disposed in the vicinity of a driver's seat (for example, an instrument panel or a steering column) in the vehicle interior, and a switch operation signal is input to the device-side microcomputer 11 by the operation. Is done.

  The door lock device 15 is a device that automatically locks and unlocks the door lock. When the unlock permission signal is input from the device-side microcomputer 11, the door lock is unlocked, and when the lock permission signal is input. Lock the door lock. Further, the door lock device 15 outputs a lock / unlock state signal indicating the lock / unlock state of the door lock to the device-side microcomputer 11.

  The engine control device 16 is connected to a cell motor (not shown). When an engine drive signal is input from the device-side microcomputer 11, the engine control device 16 drives the cell motor to start the engine and an engine state signal indicating the engine operating state. To the side microcomputer 11.

As described above, the apparatus-side microcomputer 11 can recognize the locking / unlocking state of the door lock and the operating state of the engine based on the locking / unlocking state signal and the engine state signal.
When the device side microcomputer 11 receives the ID code signal from the portable device 20 in response to the request signal and receives it by the device side receiving circuit 13, the ID code included in the ID code signal and the memory 11a are received. Vehicle ID (Door lock unlocking) on condition that the ID code stored in the vehicle is collated (outside the vehicle collation) and both ID codes match (the ID code from the portable device 20 is valid). Lock operation).

  Specifically, with reference to FIG. 1 and FIG. 2A, the device-side microcomputer 11 receives the ID code signal from the portable device 20 in response to the request signal transmitted to the outside detection area A <b> 1 in the device-side receiving circuit 13. When the received ID code included in the ID code signal is a legitimate one, that is, in the case of collation OK (possible) by the vehicle exterior verification, an unlocking permission signal is output to the door lock device 15; The door lock is unlocked on the condition that the door handle is operated. On the other hand, when the lock switch (not shown) provided on the door handle is operated in the unlocked state of the door lock, the device-side microcomputer 11 performs the vehicle exterior verification, and if the verification is OK, the door lock device 15 Outputs a lock permission signal to lock the door lock.

  Further, the device-side microcomputer 11 receives the ID code signal from the portable device 20 in response to the request signal transmitted to the vehicle interior detection area A2 by the device-side receiving circuit 13, and the ID code included in the ID code signal is In other words, in the case of collation OK by vehicle interior collation, the engine start permission state is entered. In this state, the engine switch 14 is operated together with the brake pedal, and a switch operation signal is input from the engine switch 14. Then, an engine drive signal is output to the engine control device 16 to start the engine. In other words, the device-side microcomputer 11 does not start the engine of the vehicle 1 even if the engine switch 14 is operated unless the engine start permission state is entered.

<Configuration and operation of portable device 20>
As shown in FIG. 1, the portable device 20 includes a portable device-side microcomputer (portable device-side microcomputer) 21 composed of a CPU, a ROM, a RAM, and the like, and a portable device that is controllably connected by the microcomputer 21. A portable device side receiving circuit 22 as a device side receiving means and a VCO (portable device side transmitting circuit) 23 (VCO: Voltage Controlled Oscillator) as a portable device side transmitting means are provided. Furthermore, the portable device side microcomputer 21 transmits a locking switch 24a for transmitting a locking / unlocking operation signal including a locking operation code from the portable device 20 and an unlocking operation for transmitting a locking / unlocking operation signal including an unlocking operation code. The switches 24b are electrically connected. Further, referring to FIG. 2B, the locking / unlocking switches 24 are provided on the design surface of the portable device 20 in an operable state. The microcomputer 21 includes a non-volatile memory 21a, in which a locking / unlocking operation code, a request code and an ID code unique to the vehicle 1 are stored.

  The portable device-side receiving circuit 22 is configured to receive a WAKE signal and a request signal (LF band radio waves) transmitted from the device-side transmitting circuit 12. And the portable device side receiving circuit 22 demodulates them into a pulse signal when the portable device 20 enters the vehicle exterior detection area A1 or the vehicle interior detection area A2 and receives the WAKE signal or the request signal. Output to.

  The VCO 23 is configured to be able to transmit radio waves of two (plural) types of frequencies (f1 = 321.145 MHz, f2 = 322.155 MHz) belonging to a specific frequency band that can be received by the device-side receiving circuit 13. In other words, the VCO 23 is controlled by the portable device-side microcomputer 21 and an ID code including the ACK signal and the ID code, respectively, which are returned on condition that the WAKE signal and the request signal transmitted from the communication control device 10 are normally received. The signal and the locking / unlocking operation signal can be modulated into radio waves of the two types of frequencies and transmitted to the communication control device 10 provided in the vehicle 1.

  Specifically, as shown in FIG. 3, the VCO 23 forms a so-called Colpitts-type transmission circuit, and includes an input terminal 22t1 connected to the output side of the portable device side microcomputer 21 and an output terminal 22t2 connected to the antenna. And a capacitor section in which a varicap (variable capacitance diode) 22b and a capacitor 22c are connected in parallel so as to form a feedback circuit to the transistor 22d as an amplifying section. A coil portion. The emitter terminal of the transistor 22d is connected between the varicap 22b and the capacitor 22c. The input terminal 22t1 is connected to the base terminal of the transistor 22d, and the output terminal 22t2 is connected to the collector terminal of the transistor 22d. Two types of VCO control voltages (oscillation frequency adjustment voltages) Vc output from the portable device side microcomputer 21 are applied to the varicap 22b from the input terminal 22t3 via the signal line 22s. Based on the change in capacitance corresponding to Vc, the oscillation frequency of the VCO 23 is set to f1 and f2.

  Returning to FIG. 1, when the portable device-side microcomputer 21 receives a request signal from the communication control device 10 of the vehicle 1 via the portable device-side receiving circuit 22, the request code included in the signal is stored in the memory 21 a. The ID code stored in the memory 21a is converted into an ID code signal and output to the VCO 23 on the condition that the two request codes are matched with each other.

  In addition, when a lock / unlock signal is input from the lock / unlock switch 24 according to the operation content of the lock / unlock switch 24, the portable device side microcomputer 21 stores the request signal in the memory 21a regardless of whether or not a request signal is received. The locking / unlocking operation code is converted into a locking / unlocking operation signal and output to the VCO 23 together with the ID code signal.

  Then, when the ID code signal or the locking / unlocking operation signal is input from the portable device side microcomputer 21, the VCO 23 modulates each signal into radio waves of two types of frequencies f1 and f2 belonging to the specific frequency band, A transmission is made from the antenna toward the vehicle 1.

<Transmission frequency of radio wave from portable device 20 and transmission / reception state of vehicle communication control system 30>
Next, before describing the processing of the vehicle communication control system 30, the transmission frequencies f1 and f2 of radio waves transmitted from the portable device 20 when there is a narrow-band noise (environmental noise) in the surrounding environment of the vehicle 1. The relationship between the portable device 20 and the transmission / reception state between the communication control device 10 will be described.

Referring to FIG. 4, on the upper side of the curve 40 indicating the selection ratio (dB) of noise and signal received by the communication control device 10 (= 10 · log ₁₀ (noise intensity) / (signal intensity)). At the noise frequency (kHz) on the horizontal axis, the intensity of noise is large relative to the intensity of the ID code signal, the locking / unlocking operation signal, etc., and each signal cannot be received normally. That is, in the area above the curve 40, reception of each signal is hindered by noise interference, and the apparatus-side microcomputer 11 cannot recognize each signal. That is, the curve 40 indicates the limit of the selection ratio at which each signal transmitted from the portable device 20 can be normally received by the communication control device 10.

Here, noise having the same frequency f ₀ as the center frequency f ₀ (= 312.1150 MHz) in the specific frequency band (312.150 MHz ± 0.125 MHz) received by the device-side receiving circuit 13 in the surrounding environment of the vehicle 1. As shown in FIG. 4, at the center frequency f ₀ , the curve 40 forms a portion 40 a that is approximately 15 (dB) lower than the base approximately 0 (dB) line. In the depressed portion 40a, interference between noise and signal is significant, and even if the selection ratio is increased to, for example, about −10 (dB), the communication control device 10 cannot receive signals normally.

The width of the portion 40a where the reception state of the signal is reduced is ± 10 kHz around the center frequency f ₀ of the specific frequency band. That is, when the noise frequency matches the center frequency f ₀ , if the signal is transmitted at a frequency at least 10 kHz away from the center frequency f ₀ , the signal can be normally received by the communication control device 10 without increasing the selection ratio so much. It becomes like this.

  That is, this is because the VCO 23 is used as in the portable device 20 of the present embodiment, and as shown in FIG. 5, two types of transmission frequencies in which the difference in frequency between f1 = 321.145 MHz and f2 = 322.155 MHz is about 10 kHz. If the signal can be transmitted at the frequency f1 (or f1), even if it is disturbed by noise at one frequency f1 (or f2) and cannot be normally received by the communication control device 10, the transmission frequency f2 (or f1) larger by 10 kHz than that. Then, even if the selection ratio is not so high, it means that various signals can be normally received from the portable device 20 without being disturbed by the noise.

<Processing of Vehicle Communication Control System 30>
As described above, when there is noise that interferes with normal communication between the portable device 20 and the communication control device 10 in the surrounding environment of the vehicle 1, a door is used for processing performed by the vehicle communication control system 30 of the present embodiment. An example of the locking and unlocking operation will be described with reference to the flowchart shown in FIG.

  First, in step S1, the WAKE signal is completely transmitted at a predetermined cycle from the device-side transmission circuit 12 of the communication control device 10 to the vehicle exterior detection area A1 or the vehicle interior detection area A2 shown in FIG. When the portable device 20 enters the vehicle exterior detection area A1 or the vehicle interior detection area A2, the portable device side microcomputer 21 determines whether or not a WAKE signal has been received via the portable device side reception circuit 22.

  In step S2, when the mobile device side microcomputer 21 receives the WAKE signal, the portable device side microcomputer 21 sets the VCO control voltage Vc as a reply, and sends the ACK signal via the VCO 23 to one of the transmission frequencies f1 and f2. (In this case, the transmission frequency f1 = 312.145 MHz) is returned to the communication control device 10. When this ACK signal is received by the communication control device 10, the communication control device 10 transmits a request signal to the vehicle exterior detection area A1 or the vehicle interior detection area A2.

  After transmitting the ACK signal, in step S <b> 3, the portable device side microcomputer 21 turns on a timer for confirming reception of the request signal transmitted from the communication control device 10. Here, the set time of the timer is set to be shorter than the WAKE signal transmission cycle (250 [msec]) by the communication control device 10.

  In subsequent steps S4 to S8, the portable device-side microcomputer 21 determines whether or not a request signal has been received within the time-up period of the timer (steps S4, S5, and S8).

  Specifically, the portable device-side microcomputer 21 includes a request code that matches the request code stored in the memory 21 a of the microcomputer 21 in the LF band radio wave received via the portable device-side receiving circuit 22. Determine whether or not. As a result, when the request code is not included, the portable device side microcomputer 21 determines that the request signal is not received, and when the request code is included, the portable device side microcomputer 21 determines that the request signal is received.

  If the portable device side microcomputer 21 has timed up without receiving the request signal, the portable device side microcomputer 21 determines again whether or not the WAKE signal has been received (step S6), and receives the WAKE signal. In this case, the VCO control voltage Vc is changed, and an ACK signal is transmitted via the VCO 23 at a frequency f2 different from the previous transmission frequency f1 (here, the transmission frequency f2 = 321.155 MHz). Thereafter, this is repeated until a request signal is received (when the request signal is not received, the process returns to position A in the processing flow).

  On the other hand, if it is determined in step S4 that the request signal has been received, in the subsequent step S9, the portable device side microcomputer 21 converts the ID code stored in the memory 21a into an ID code signal and outputs it to the VCO 23.

  Further, in the next step S10, the VCO 23 transmits an ID code signal to the communication control device 10 at the same transmission frequency (either f1 or f2) as the ACK signal transmitted last time. In this case, since the request signal can be received as a reply of the ACK signal transmitted last time on the portable device 20 side, the communication control device 10 side receives the ACK signal from the portable device 20 without being disturbed by noise. It is done normally.

  That is, the portable device-side microcomputer 21 of the portable device 20 fixes the VCO control voltage Vc applied to the VCO 23 at the voltage Vc at which the ACK signal was transmitted last time, and sets the ID code signal at the transmission frequency corresponding to the voltage Vc. To the communication control apparatus 10.

  In step S11, when the apparatus-side microcomputer 11 receives the ID code signal (radio wave) via the apparatus-side receiving circuit 13, in step S12, the ID code included in the ID code signal and the apparatus-side microcomputer 11 Collation with the ID code stored in the memory 11a (verification outside the passenger compartment) is performed, and the door lock / unlock operation is permitted in step S13 on condition that both ID codes match. In steps S11 and S12, if reception of radio waves including each signal is not confirmed or the ID codes do not match, the processing here is temporarily terminated.

As described above, according to the portable device 20 and the vehicle communication control system 30 of the present embodiment, the following operations and effects can be obtained.
(1) In the present embodiment, wireless communication between the portable device 20 possessed by the user of the vehicle 1 and the communication control device 10 provided in the vehicle 1 and capable of receiving radio waves of a specific frequency band. In the case where noise that interferes with the specific frequency band is present, even if reception by the communication control device 10 of the radio wave having one transmission frequency f1 belonging to the specific frequency band is obstructed by the noise, The frequency of the radio wave belonging to the frequency band is set to another frequency f2 that is not disturbed by noise. For this reason, wireless communication between the portable device 20 and the communication control apparatus 10 is normally performed without being disturbed by noise. In addition, since the frequency range that can be received by the communication control device 10 side remains unchanged in the specific frequency band originally set in the communication control device 10, there is no change in the circuit on the communication control device 10 side. It is not necessary to make a simple circuit change by adding the varicap 22b on the portable device 20 side.

  (2) In the present embodiment, the frequency f1 of the radio wave transmitted from the portable device 20 possessed by the user of the vehicle 1 by the portable device side microcomputer 21 (frequency setting means) belongs to the specific frequency band, and the frequency When the radio wave of f1 is received by the communication control device 10, when it is disturbed by noise belonging to the same specific frequency band, it automatically switches to another frequency f2 belonging to the specific frequency band and not disturbed by the noise. Can be changed. For this reason, wireless communication between the portable device 20 possessed by the user of the vehicle 1 and the communication control device 10 capable of receiving radio waves of a specific frequency band without impairing the convenience of the user of the vehicle 1. Will surely be done.

  (3) In the present embodiment, in the vehicle communication control system 30 that controls in-vehicle devices provided in the vehicle 1 based on wireless communication performed between the portable device 20 and the communication control device 10, the communication control device Without changing anything on the 10 side, the radio wave transmitted from the portable device 20 is set to a frequency that is not disturbed by noise, and control of the in-vehicle device based on the wireless communication is normally performed.

The above embodiment may be modified as follows.
In the above embodiment, when setting the frequency f1 or f2 of the radio wave transmitted by the portable device 20 within a specific frequency band that can be received by the communication control device 10 (device-side receiving means), transmission is performed at the same frequency f1 or f2. The frequency (f1 or f2) on which the received ACK signal is normally received by the communication control device 10 is set. However, the technical idea of the present invention is not limited to this, and the frequency of the radio wave transmitted by the portable device 20 is, for example, a VCO control voltage Vc different from the VCO 23 at a predetermined period synchronized with the clock frequency of the portable device-side microcomputer 21. And may be alternately changed in time series. In this case, it is not always necessary to alternately transmit radio waves of a plurality of frequencies. After transmitting radio waves of the same frequency continuously, switching to radio waves of different frequencies may be performed. Not necessarily.

  -In the said embodiment, the frequency of the electromagnetic wave which the portable device 20 transmits was made into 2 types, f1 or f2, and the difference was about 10 kHz. However, the present invention is not limited to this, and there is no need to change the circuit on the communication control device 10 side. In addition, the effect of noise that interferes when the communication control device 10 receives the ID code signal from the portable device 20 is effective. As long as it can be eliminated, the frequency of the radio wave may be less than 10 kHz (for example, 8 kHz) or more than 10 kHz (for example, 20 kHz).

  -In the said embodiment, the frequency of the electromagnetic wave which the portable device 20 transmits was made into 2 types, f1 or f2. However, the present invention is not limited to this, and there is no need to change the circuit on the communication control device 10 side. In addition, the effect of noise that interferes when the communication control device 10 receives the ID code signal from the portable device 20 is effective. As long as it can be eliminated, the frequency of the radio wave may be three or more in the specific frequency band.

  In the above-described embodiment, the example in which the vehicle communication control system 30 is applied to the door lock locking / unlocking control of the vehicle 1 has been described, but the same applies to the engine start control for permitting the engine start of the vehicle 1. Of course, it is applicable to.

  In the above embodiment, the security object is a vehicle 1 such as an automobile, and the communication control system 30 including the communication control device 10 and the portable device 20 is locked and unlocked or the engine is started. A vehicle communication control system for performing vehicle control in a possible state is provided. However, the technical idea of the present invention is not limited to this, and the security object may be a real estate such as a house, and can be applied to the lock / unlock control of the door lock provided on the door of the house.

  In the above embodiment, the frequency of the radio wave transmitted by the portable device 20 is automatically changed using the portable device side microcomputer 21 and the VCO 23 provided in the portable device 20, but the switch provided in the portable device 20 The two types of radio waves can be changed manually by the above operation. In this case, the frequency of the radio wave transmitted from the portable device can be changed based on the intention of the user of the vehicle 1.

  Specifically, the VCO control voltage that is different from the VCO 23 at a predetermined cycle synchronized with the clock frequency (counter) of the portable device-side microcomputer 21 triggered by the operation of the unlocking switch 24 (the locking switch 24a or the unlocking switch 24b). Vc may be applied and changed alternately in time series. In this case, for example, when the counter is an odd number, the transmission is performed at the frequency f1, and when the counter is an even number, the transmission is performed at the frequency f2.

  Moreover, it is also possible to comprise so that the transmission frequency of the electromagnetic wave from the portable device 20 may be changed depending on the operation time of the locking / unlocking switch 24. In this case, by the control using the portable device side microcomputer 21 and the VCO 23, for example, the radio wave transmission frequency is set to f1 in a short time operation within 1 second, and the radio wave transmission frequency is set to f2 in a long time operation exceeding that. To be configured.

  Further, the transmission frequency can be changed by the difference in the number of operations of the locking / unlocking switch 24. In this case, the control using the portable device side microcomputer 21 and the VCO 23 is configured so that the radio wave transmission frequency is f1 in one operation per second and the radio wave transmission frequency is f2 in two operations. To do.

  Furthermore, in addition to changing the transmission frequency by operating the locking / unlocking switch 24 (locking switch 24a or unlocking switch 24b), a dedicated frequency change switch (button) is provided to change the transmission frequency from the portable device 20. You can also

  On the other hand, as a method not based on the user's intention, a radio wave from the portable device 20 is used on the condition that the lock / unlock switch 24 is operated once and operated again within a time-up (for example, 5 seconds) using a timer. The transmission frequency can also be changed.

Further, technical ideas that can be grasped from the above-described embodiments and modifications will be described below.
In the portable device according to claim 1 or 2, the center frequency of the specific frequency band belongs to a UHF (ultra high frequency) band of 300 MHz or more and 3 GHz or less, and each frequency is A portable device in which the difference is set to about 10 kHz. According to this configuration, it is possible to use radio waves in a frequency band that is preferably used for an electronic key system of a vehicle, and the difference between the frequencies is set to about 10 kHz. Therefore, the electronic key system is used. In this case, it is possible to effectively avoid the influence of environmental noise that becomes a disturbance.

  The object is a vehicle such as an automobile, and the portable device according to claim 1 or 2 receives a radio wave transmitted from the portable device and is based on a signal included in the radio wave. And a communication control device for controlling an in-vehicle device provided in the vehicle. According to this configuration, it is possible to improve the security level such as theft prevention of the vehicle by a low cost and simple and reliable method, which contributes to the convenience of the user of the vehicle and greatly enhances the security reliability. Become.

1 is a circuit block diagram showing a schematic configuration of a vehicle communication control system according to an embodiment of the present invention. (A) is a schematic diagram showing a vehicle exterior detection area A1 and a vehicle interior detection area A2 where radio waves transmitted from the vehicle are received by the mobile device, and (b) is a perspective view of the mobile device. 1 is a circuit diagram of a VCO (portable device side transmission circuit) according to an embodiment of the present invention. The graph which shows the selection ratio (noise / signal) (vertical axis) of two received signals with respect to the noise frequency (horizontal axis) of the communication control apparatus which concerns on embodiment of this invention. The graph figure which shows the electromagnetic wave of 2 types of frequency (VCO oscillation frequency) transmitted from the portable device which concerns on embodiment of this invention with a signal level. The flowchart figure which shows operation | movement of the communication control system for vehicles which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 10 ... Communication control apparatus, 13 ... Receiver, 20 ... Portable machine, 23 ... VCO (portable machine side transmission circuit), 30 ... Communication control system for vehicles.

Claims (3)

In a portable device that transmits a radio wave possessed by a user of an object and including a signal for controlling a device provided on the object to a predetermined receiving unit capable of receiving an electric wave of a frequency in a specific frequency band ,
Portable device side transmission means for transmitting radio waves belonging to the specific frequency band;
Frequency setting means for setting the frequency of radio waves transmitted from the portable device side transmission means,
When the frequency setting means is disturbed by one frequency belonging to the specific frequency band and noise belonging to the specific frequency band when radio waves of the one frequency are received by the receiving means, the specific frequency A portable device that can be set to another frequency that belongs to a band and is not disturbed by the noise. The portable device according to claim 1,
The frequency setting means is a portable device in which each frequency can be automatically changed, or each frequency can be changed by a switch operation.   A portable device according to claim 1 or 2, and a communication control device that receives a radio wave transmitted from the portable device and controls a device provided on the object based on a signal included in the radio wave; A communication control system comprising:

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