JP2012021331A - Portable apparatus and vehicle communication system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle communication system mainly used for remote control for locking/unlocking vehicle doors that prevents false recognition and has high productivity.SOLUTION: A portable apparatus 30 comprises; a transmission intensity adjusting circuit 25 for switching intensity of a registration signal transmitted from a portable apparatus antenna 1 between intense output and weak output; and a control circuit 26 that controls the transmission intensity adjusting circuit 25 and transmits the registration signal with weak output from the portable apparatus antenna 1. Accordingly, a vehicle communication system 40 can control a range in which the registration signal can be received around the portable apparatus 30 and can suppress interference of the registration signals of the plural portable apparatuses 30, which allows the prevention of the false recognition and the high productivity.

Description

  The present invention relates to a portable device mainly used for remote operation such as locking / unlocking of a door of a vehicle and a vehicle communication system using the portable device.

  In recent years, vehicle communication systems that remotely lock and unlock a vehicle door by remotely operating an in-vehicle device from a remote location using a portable device carried by a driver are widely spread and efficient. What can be produced is required.

  A portable device used in such a conventional vehicle communication system will be described with reference to FIGS.

  FIG. 5 is a block diagram showing a configuration of a conventional vehicle communication system, in which a portable device antenna 1 formed with a wiring pattern or the like on a printed circuit board is electrically connected to a transmission circuit 2 configured with electronic components. It is connected to the.

  A control circuit 3 composed of a semiconductor element such as a microcomputer is electrically connected to the transmission circuit 2, and the control circuit 3 is electrically connected to an input switch 4 such as a push button switch.

  The portable device 5 includes the portable device antenna 1, the transmission circuit 2, the control circuit 3, and the input switch 4.

  In the control circuit 3, a unique identification code for each portable device 5 is stored in a nonvolatile memory or the like.

  That is, the portable device 5 is configured to transmit the registration signal including the identification code stored in the control circuit 3 by the input from the input switch 4 from the portable device antenna 1 via the transmission circuit 2.

  The in-vehicle device antenna 6 is a linear antenna configured by soldering, for example, a metal conductive wire bent in an L shape vertically on a printed circuit board.

  The in-vehicle device antenna 6 is electrically connected to a receiving circuit 7 composed of electronic components and the like, and is electrically connected to the control circuit 8 composed of a semiconductor element such as a microcomputer via the receiving circuit 7. Yes.

  Further, the control circuit 8 is connected to the external output terminal 9 </ b> A and the external input terminal 9 </ b> B to configure the in-vehicle device 10, and the mobile communication system 20 is configured from the portable device 5 and the in-vehicle device 10.

  That is, in the in-vehicle device 10, the registration signal from the portable device 5 is input to the control circuit 8 via the in-vehicle device antenna 6 and the receiving circuit 7, and the control circuit 8 receives the input signal from the external input terminal 9 </ b> B and the portable device 5. The signal is output to the external output terminal 9A based on the registration signal.

  When registering the portable device 5 configured as described above with respect to the in-vehicle device 10, first, the external input terminal 9B is short-circuited outside the in-vehicle device 10 to place the in-vehicle device 10 in the registration mode. Then, the portable device 5 transmits the identification code of the portable device 5 as a registration signal in a vehicle production line or the like, and the registration signal is received by the vehicle-mounted device 10 and input via the vehicle-mounted device antenna 6 or the like. At 8, the identification code is registered.

  In such a vehicle production line, for example, vehicles with the in-vehicle devices 10 are arranged at intervals of 10 m, and are registered almost simultaneously with a plurality of vehicles. In such a place, there is a case where an erroneous recognition of the identification code occurs as described with reference to the signal diagram of FIG. 6, and in this case, the identification code needs to be re-registered.

  Here, FIG. 6 shows a pair of the portable device 5 and the in-vehicle device 10 corresponding to the first vehicle, and a pair of the portable device 5A and the in-vehicle device 10A corresponding to the second vehicle. The signal diagram in the case where registration is performed almost simultaneously in each of the portable device 5B and the in-vehicle device 10B is shown. (A) is a transmission signal of the portable device 5A, (b) is a reception signal of the in-vehicle device 10A, (c) is a transmission signal of the portable device 5B, and (d) is a reception signal of the in-vehicle device 10B. Signal. The actual signal is a signal on which a high-frequency signal in the UHF band to be transmitted or received is superimposed, but only the amplitude is shown in FIG.

  Here, as shown in FIG. 9A, the portable device 5A has a transmission strength SA, and the identification code P01 is transmitted as a registration signal. When the identification code P02 is transmitted as a registration signal with the transmission intensity SA, the identification code P01 of the portable device 5A close to the in-vehicle device 10A is strong as shown in FIG. The code P02 is received with a slightly weak intensity.

  However, both of the identification codes P01 and P02 exceed the reception threshold value TH1, and the in-vehicle device 10A recognizes the identification code P03 that the identification codes P01 and P02 overlap, and the identification code of the portable device 5A to be originally registered. P01 is not registered. Further, in the in-vehicle device 10B as shown in FIG. 4D, the same misrecognition occurs only by changing the distance relationship with the portable devices 5A and 5B.

  Thus, when trying to register a plurality of portable devices 5 in each vehicle-mounted device 10 at the same time, an identification code may be erroneously recognized.

  As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

JP 2005-328245 A

  As described above, in the conventional vehicle communication system, when the identification code of the portable device 5 is stored in the in-vehicle device 10, if another portable device 5 is operated at a remote location, erroneous recognition occurs. Therefore, there is a problem that productivity needs to be set again and productivity is lowered.

  The present invention solves such a conventional problem, and an object thereof is to provide a portable device that is less prone to erroneous recognition and has high productivity, and a vehicle communication system using the portable device.

  In order to achieve the above object, the present invention has the following configuration.

  According to the first aspect of the present invention, a portable device antenna, a transmission circuit electrically connected to the portable device antenna, a control circuit electrically connected to the transmission circuit, and a control circuit via the transmission circuit And a transmission intensity adjustment circuit that is disposed between the portable device antenna and electrically connected to the control circuit and the transmission circuit. Since the portable circuit is configured so that the control circuit controls the transmission intensity adjusting circuit and transmits the registration signal from the portable device antenna with a weak output by switching the output, the portable device can receive the registration signal. The peripheral area can be limited, and there is an effect that it is possible to provide a portable device suitable for a vehicle communication system with high productivity that is unlikely to cause erroneous recognition.

  According to the second aspect of the present invention, the registration signal transmitted from the portable device antenna is input from the in-vehicle device antenna to the in-vehicle device side control circuit via the in-vehicle device side receiving circuit, and the in-vehicle device side control is performed. Since the circuit constitutes the vehicle communication system as a memory that stores when the strength of the registration signal exceeds a predetermined threshold, it is possible to provide a highly productive vehicle communication system that is unlikely to cause erroneous recognition. Have

  Furthermore, the invention described in claim 3 is the vehicle communication system according to claim 2, wherein the portable device further includes a receiving circuit, the in-vehicle device includes a transmitting circuit, and the registration start signal is transmitted from the in-vehicle device. Since the vehicle communication system is configured such that the portable device transmits the registration signal, even if the operator operates the portable device, the portable device is not shifted to a registration mode in which the portable device can be registered, and erroneous recognition is unlikely to occur. It has the effect that a highly productive vehicle communication system can be provided.

  As described above, according to the present invention, it is possible to realize an advantageous effect that it is possible to realize a portable device that is less likely to be erroneously recognized and has high productivity.

1 is a circuit block diagram of a vehicle communication system according to a first embodiment of the present invention. Signal diagram in registration mode of the vehicle communication system Flow chart showing control of portable device in registration mode of same vehicle communication system Signal diagram in registration mode of the plurality of vehicle communication systems Circuit block diagram of conventional vehicle communication system Signal diagram in registration mode of conventional vehicle communication systems

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  Further, the same reference numerals are given to the same components as those described in the background art section, and the detailed description will be simplified.

(Embodiment 1)
FIG. 1 is a circuit block diagram of a vehicle communication system according to an embodiment of the present invention. In FIG. 1, a portable device antenna 1 has a resonance frequency in a UHF band of 315 MHz, for example, and is formed on a printed circuit board. The wiring pattern is configured as a planar antenna.

  And the wiring extended from this portable machine antenna 1 branches in the shared circuit 21 comprised by semiconductor elements, such as an antenna sharing device and an antenna switch, and the transmission circuit comprised by electronic components, such as a coil and a capacitor | condenser 2 and also electrically connected to a receiving circuit 22 composed of electronic components such as coils and capacitors.

  The control circuit 26 is composed of a semiconductor element such as a microcomputer, and is electrically connected to the input switch 4 such as a push switch, and is also electrically connected to the receiving circuit 22 and transmits to the transmitting circuit 2. Electrical connection is made via the intensity adjustment circuit 25.

  Note that individual identification codes are stored in a nonvolatile memory such as a ROM or a RAM of the control circuit 26.

  Here, the transmission intensity adjustment circuit 25 includes, for example, a resistance element 23 provided between the control circuit 26 and the transmission circuit 2, a switch element 24 having one end connected to the ground, the other end of the switch element 24, and the control circuit 26. The switch element 24 is composed of a resistance element 23 provided therebetween, and switches ON / OFF by a signal from the control circuit 26.

  In other words, by appropriately setting the resistance values of the two resistance elements 23, the control circuit 26 has a strong output when the switch element 24 is turned off, and a desired attenuation when the switch circuit 24 is turned on. A signal can be output to the transmission circuit 2 with a weak transmission intensity.

  The portable device 30 includes the portable device antenna 1, the shared circuit 21, the transmission circuit 2, the reception circuit 22, the transmission intensity adjustment circuit 25, the control circuit 26, and the input switch 4.

  That is, the signal input from the portable device antenna 1 is input to the control circuit 26 via the shared circuit 21 and the reception circuit 22, and the registration signal including the identification code transmitted from the control circuit 26 is transmitted to the transmission circuit 2, It is configured to be able to transmit to the outside of the portable device 30 via the shared circuit 21 and the portable device antenna 1. Here, the portable device 30 can adjust the transmission intensity of the registration signal to either a strong output or a weak output by turning on the switch element 24 based on the signal input to the control circuit 26. It has become a thing.

  The in-vehicle device antenna 6 has a resonance frequency in the UHF band of 315 MHz, for example, and is formed as a linear antenna by soldering a metal conductor bent in an L shape vertically on a printed circuit board. Composed.

  And the wiring extended from this vehicle equipment antenna 6 branches in the shared circuit 31 comprised by semiconductor elements, such as an antenna sharing device and an antenna switch, and the transmission circuit comprised by electronic components, such as a coil and a capacitor | condenser 32 and a receiving circuit 7 which is also composed of electronic components such as coils and capacitors.

  The transmission circuit 32 and the reception circuit 7 are electrically connected to a control circuit 33 constituted by a semiconductor element such as a microcomputer. The control circuit 33 is electrically connected to the external output terminal 9A and the external input terminal 9B. Has been.

  The in-vehicle device antenna 6, the shared circuit 31, the reception circuit 7, the transmission circuit 32, and the control circuit 33 constitute an in-vehicle device 35, and the portable device 30 and the in-vehicle device 35 constitute a vehicle communication system 40. Yes.

  In other words, the in-vehicle device 35 can transmit from the control circuit 33 via the transmission circuit 32, the shared circuit 31, and the in-vehicle device antenna 6, and the registration signal from the portable device 30 can be transmitted to the in-vehicle device antenna 6, the shared circuit 31, and the receiving circuit. 7 and the control circuit 33 can register the identification code.

  When registering the portable device 30 configured as described above with respect to the in-vehicle device 35, first, the external input terminal 9B is short-circuited outside the in-vehicle device 35 to place the in-vehicle device 35 in the registration mode. Next, the registration procedure will be described with reference to a signal diagram of FIG. 2 and a flowchart showing control of the portable device 30 of FIG.

  Here, FIG. 2A shows a transmission signal of the in-vehicle device 35, FIG. 2B shows a transmission signal of the portable device 30, and FIG. 2C shows a reception signal of the in-vehicle device 35. . The actual signal is a signal on which a high-frequency signal in the UHF band to be transmitted or received is superimposed, but only the amplitude is shown in FIG.

  In the flowchart of FIG. 3, when power is supplied to the portable device 30 from a built-in battery or the like, the control circuit 26 waits for reception of a registration start signal S11 from the in-vehicle device 35 (S1). 2A, when the registration start signal S11 is transmitted from the in-vehicle device 35 and received by the control circuit 26, the control circuit 26 initializes the timer count and starts the timer count. Time is measured (S2). Then, transmission intensity reduction control is performed (S3).

  Here, the transmission strength reduction control is specifically to make a registration signal to be transmitted ready for transmission with weak output. Note that switching the strong output and the weak output of the transmission intensity is performed by turning on the switch element 24.

  For example, in the portable device 30 operated as a specific low power radio station, the transmission intensity from the portable device antenna 1 when the switch element 24 used for locking and unlocking the vehicle is OFF is 70 to 89.5 dBμV / m (Japan Electric field strength measured in the 3m measurement method based on Article 6, Paragraph 2 of the Radio Law Enforcement Regulations), but this is a strong output, while the transmission intensity from the portable device antenna 1 when ON is a weak output It is set to 15 to 30 dB μV / m, and is attenuated by 40 dB or more by switching the switch element 24 ON / OFF.

  Alternatively, for example, in the portable device 30 operated as a weak radio station, the transmission intensity from the portable device antenna 1 when the switch element 24 is OFF is 45 to 54 dBμV / m (as defined in Article 6, Paragraph 2 of the Japanese Radio Law Enforcement Regulations). Field strength measured in the 3 m measurement method based on this), which is a strong output, the transmission intensity from the portable device antenna 1 at the time of ON is 15-30 dBμV / m at a weak output, and the switch element 24 is ON Attenuate 15 dB or more with / OFF switching.

  When the control circuit 26 detects that the operator has pressed the input switch 4 and the input switch 4 is turned on (S4), the identification code P11 shown in FIG. 2B is transmitted as a registration signal. (S5). The transmission intensity of the registration signal is transmitted with the weak output intensity SB attenuated from the strong output intensity SA.

  Then, when the identification code P11 is received by the in-vehicle device 35, since the reception intensity exceeds the threshold value TH1, the identification code P11 is registered in the in-vehicle device 35.

  When the identification code P11 is registered, the in-vehicle device 35 transmits a registration end signal S12, and when the control circuit 26 receives the registration end signal S12 (S6), the control circuit 26 switches the switch element 24 to OFF. To the switch element 24, the transmission intensity of the portable device 30 returns to the transmission intensity used for locking and unlocking of the vehicle (S7), and the control ends.

  If the operator does not operate the input switch 4 for a predetermined time after the control circuit 26 performs the transmission intensity reduction control (S3), the control circuit 26 checks whether the timer count has elapsed for the predetermined time T1 during that time. (S8), when the predetermined time T1 has elapsed, the transmission strength is returned to the strength SA (S7), and the control is terminated.

  As described above, the portable device 30 transmits the identification code P11 as a registration signal in a state where the transmission strength is attenuated to the weak strength SB by the transmission strength reduction control (S3). Since it exceeds the threshold value TH1, it can be registered as a usable portable device 30.

  A case where a plurality of vehicles are manufactured side by side in a vehicle manufacturer's manufacturing line and the portable device 30 is registered in the vehicle-mounted device 35 in each vehicle will be described with reference to FIG.

  Here, with respect to the portable device 30 and the in-vehicle device 35, those corresponding to the first vehicle are designated as the portable device 301 and the in-vehicle device 351, and the registration work is performed at a location about 10 m away from the first vehicle. A device corresponding to a vehicle will be described as a portable device 302 and an in-vehicle device 352. The registration signal of the portable device 301 is the identification code P11 as in the above description, and the portable device 302 is the identification code P12.

  FIG. 4A is a signal diagram, FIG. 4A is a transmission signal of the in-vehicle device 351, FIG. 4B is a reception signal of the portable device 301, and FIG. 4C is a reception signal of the in-vehicle device 351. Similarly, FIG. 4D shows a transmission signal of the in-vehicle device 352, FIG. 4E shows a reception signal of the portable device 302, and FIG. 4F shows a reception signal of the in-vehicle device 352.

  The actual signal is a signal on which a high-frequency signal in the UHF band to be transmitted or received is superimposed, but only the amplitude is shown in FIG.

  Here, at the time of registration of the first vehicle, a registration start signal S11 is transmitted from the in-vehicle device 351 ((a) in the figure), and then an identification code P11 is returned as a registration signal from the portable device 301 (same as the above). (B)), the identification code P11 can be received by the in-vehicle device 351 without being damaged ((c) in the figure), and the in-vehicle device 351 transmits a registration end signal S12 ((a) in the figure).

  Further, as will be described below, even if the registration work in the second vehicle is performed almost simultaneously with the registration work in the first vehicle, the in-vehicle device 352 is caused to succeed in the registration work of the portable device 302. be able to.

  Here, a registration start signal S11 is transmitted from the in-vehicle device 352 ((d) in the figure), and then an identification code P12 is returned as a registration signal from the portable device 302 ((e) in the same figure). Even if the time zone for transmitting the identification code P12 from the portable device 302 is continuous or overlapped with the time zone for transmitting the identification code P11 from the portable device 301, the reception intensity of the identification code P11 is small and less than the threshold TH1. Therefore, the received intensity is not recognized as the identification code by the in-vehicle device 352. On the other hand, since the reception intensity of the identification code P12 is equal to or higher than the threshold value TH1 ((f) in the figure), the identification code P12 can be recognized as an identification code without being inhibited by the transmission of the identification code P11.

  Note that the identification code P12 transmitted from the portable device 302 is less than the threshold TH1 when received by the in-vehicle device 351, and is not the reception intensity recognized by the in-vehicle device 351 but the identification code P11 in the in-vehicle device 351. Registration is not inhibited ((c) in the figure).

  That is, when the registration signal is transmitted by the portable devices 301 and 302, since the transmission intensity is attenuated from the strength SA to the strength SB, the transmission time of the registration signals of the portable devices 301 and 302 is continuous or overlapped. Even in the case, an appropriate identification code can be registered in both the in-vehicle devices 351 and 352 without being inhibited from each other.

  In the above description, the in-vehicle device 35 transmits the registration start signal S11 to the portable device 30, and further transmits the registration end signal S12. However, the present invention is not limited to this, For example, instead of the registration start signal S11 of the in-vehicle device 35, an operation such as pressing the input switch 4 of the portable device 30 continuously for a predetermined time is performed, and instead of the registration end signal S12 of the in-vehicle device 35. The input switch 4 may be operated.

  According to this, since the transmission signal is not transmitted from the in-vehicle device 35, the shared circuit 31 and the transmission circuit 32 of the in-vehicle device 35 become unnecessary, and the portable device 30 can receive the transmission signal from the in-vehicle device 35. Since there is no such thing, the shared circuit 21 and the receiving circuit 22 of the portable device 30 become unnecessary.

  Note that when the in-vehicle device 35 transmits the registration start signal S11 to the portable device 30 and further transmits the registration end signal S12, the in-vehicle device can be operated even if the operator operates the input switch 4 of the portable device 30. Since the machine 35 does not shift to the registration mode, it can be performed only when registration control is necessary, and an unintended shift to the registration mode can be avoided.

  In the above description, the portable device antenna 1 is shared by the shared circuit 21 for the transmitting circuit 2 and the receiving circuit 22, and the in-vehicle device antenna 6 is shared by the shared circuit 31 for the transmitting circuit 32 and the receiving circuit 7. The present invention is not limited to this, the shared circuit 21 and the shared circuit 31 are eliminated, and the transmission circuit 2 and the reception circuit 22 are respectively connected to different portable device antennas 1 or the transmission circuit 32 and the reception circuit. 7 may be configured to be connected to different vehicle-mounted device antennas 6 respectively.

  In addition, the portable device antenna 1, the shared circuit 21, the transmission circuit 2, the reception circuit 22, the transmission intensity adjustment circuit 25, the control circuit 26, and the input switch 4 constituting the portable device 30 are electrically connected to each other. This connection includes not only a direct connection but also an indirect connection in which an electric circuit or the like is inserted therebetween.

  Similarly, the vehicle-mounted device antenna 6, the shared circuit 31, the transmission circuit 32, the reception circuit 7, and the control circuit 33 constituting the vehicle-mounted device 35 are electrically connected to each other, but this connection is only direct. In addition, an indirect one in which an electric circuit or the like is inserted is included.

  In the above description, the transmission intensity adjustment circuit 25 is described as being between the control circuit 26 and the transmission circuit 2. However, the present invention is not limited to this, and control via the transmission circuit 2 is performed. If it exists between the circuit 26 and the portable device antenna 1, the present invention can be implemented.

  Although the transmission intensity adjustment circuit 25 has been described as switching the transmission output from the portable device antenna 1 to two stages of strong output and weak output, the present invention can be implemented even when switching to multiple stages of three or more stages. It is.

  Thus, according to the present embodiment, the portable device antenna 1, the transmission circuit 2 electrically connected to the portable device antenna 1, the control circuit 26 electrically connected to the transmission circuit 2, and the transmission circuit 2 is provided between the control circuit 26 via the mobile phone antenna 1 and the transmission intensity adjustment circuit 25 electrically connected to the control circuit 26 and the transmission circuit 2. 1 to switch the intensity of the registration signal transmitted from 1 to a strong output or a weak output, and the control circuit 26 controls the transmission intensity adjustment circuit 25 to transmit the registration signal from the portable device antenna 1 with a weak output. Since the machine 30 is configured, the area around the portable device 30 that can receive the registration signal can be limited and interference of the registration signals of the plurality of portable devices 30 can be suppressed. Good It is possible to provide a portable device 30 suitable for the vehicle communication system 40.

  The registration signal transmitted from the portable device antenna 1 is input from the in-vehicle device antenna 6 to the in-vehicle device side control circuit 33 via the in-vehicle device side receiving circuit 7, and the in-vehicle device side control circuit 33 is registered. Since the vehicle communication system 40 is configured to be stored when the signal intensity exceeds a predetermined threshold, it is possible to provide the vehicle communication system 40 that is less prone to misrecognition and has good productivity.

  Further, the portable device 30 further includes the reception circuit 22 and the in-vehicle device 35 includes the transmission circuit 32. After the registration start signal S11 is transmitted from the in-vehicle device 35, the portable device 30 transmits the registration signal. Since the vehicle communication system 40 is configured, the operator does not shift to a registration mode in which the portable device 30 can be registered, regardless of how the operator operates the portable device 30, and erroneous recognition is unlikely to occur and the productivity is high. A vehicle communication system 40 can be provided.

  The portable device and the vehicle communication system according to the present invention are less likely to be erroneously recognized and have good productivity, and are useful mainly for operations such as locking and unlocking of automobile doors.

DESCRIPTION OF SYMBOLS 1 Mobile device antenna 2, 32 Transmission circuit 4 Input switch 6 Car-mounted device antenna 7, 22 Reception circuit 9A External output terminal 9B External input terminal 21, 31 Shared circuit 23 Resistance element 24 Switch element 25 Transmission intensity adjustment circuit 26, 33 Control circuit 30 portable device 35 in-vehicle device 40 vehicle communication system

Claims (3)

A portable device antenna, a transmission circuit electrically connected to the portable device antenna, a control circuit electrically connected to the transmission circuit, and between the control circuit and the portable device antenna via the transmission circuit And a transmission intensity adjustment circuit electrically connected to the control circuit and the transmission circuit, wherein the transmission intensity adjustment circuit increases the intensity of a registration signal transmitted from the portable device antenna to a strong output or a weak output. A portable device that performs switching, wherein the control circuit controls a transmission intensity adjustment circuit and transmits the registration signal from the portable device antenna with a weak output. The vehicle-mounted apparatus provided with the vehicle-mounted apparatus antenna, the receiving circuit electrically connected to the said vehicle-mounted apparatus antenna, and the control circuit electrically connected with the said receiving circuit, It is comprised from the portable apparatus of Claim 1. The registration signal transmitted from the portable device antenna is input from the in-vehicle device antenna to the in-vehicle device side control circuit via the in-vehicle device-side receiving circuit, and the in-vehicle device side control circuit is the registration device. A vehicle communication system for storing when the signal strength exceeds a predetermined threshold. The vehicle communication system according to claim 2, wherein the portable device further includes a receiving circuit, the in-vehicle device includes a transmitting circuit, and the portable device transmits the registration signal after the registration start signal is transmitted from the in-vehicle device.

Images