JP3668729B2 - In-vehicle device remote control system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a remote control system for an in-vehicle device (for example, a vehicle door lock / unlock mechanism), and more specifically, communication between an in-vehicle wireless device disposed in a vehicle and a portable wireless device outside the vehicle. The present invention relates to an in-vehicle device remote control system that performs verification of an encryption code according to, and performs control of permission or non-permission of use of a vehicle based on the verification result.
[0002]
[Prior art]
Conventionally, in addition to a remote operation function for locking / unlocking (locking / unlocking) a door of a vehicle by operating an operation unit of a portable wireless device, it is transmitted from the vehicle side without operating the operation unit. There is a smart entry system that locks / unlocks a door by returning a return code signal from a portable wireless device in response to a code (that is, encryption code) request signal, and collating the code.
For example, in Japanese Patent Laid-Open No. 5-106376, when a code request signal is received by a first receiving unit, a portable radio apparatus including a first transmitting unit that transmits a return code, and a second transmitting unit When the return code transmitted after receiving the encryption code request signal transmitted at a predetermined time interval is received by the second receiving means, a signal for unlocking the vehicle door is output and the return code is output. If no is received, a smart entry system (keyless entry system) is described which includes a vehicle wireless device including a control means for outputting a signal for locking the door of the vehicle after a predetermined time has elapsed.
[0003]
Also, conventionally, a return code signal is returned in response to an encryption code request signal from the vehicle side, and the steering lock mechanism is unlocked and the engine start prohibition device is released by checking the code, and a mechanical key is used. There is a smart start system that makes it possible to start the engine.
For example, in Japanese Patent Laid-Open No. 63-1765, a call signal is transmitted to a portable wireless device, a code code signal is received from the portable wireless device, collated with an internal code, and when the codes match, the steering lock mechanism is undisclosed. A system is described which comprises means for allowing each of the locking operation, the switching operation of the ignition switch and the switching operation of the accessory switch.
[0004]
[Problems to be solved by the invention]
A system that combines both of the systems described above (ie, smart entry system and smart start system) is referred to as a smart entry / start system.
In order to increase the penetration rate of such a smart entry / start system, it is necessary to reduce the cost without impairing security and convenience, and there are the following problems.
[0005]
(1) In the above smart entry system, in addition to the basic door lock / unlock control, a function for detecting the presence or absence of a portable wireless device in the vehicle and warning the misplacement of the portable wireless device in the vehicle is also required for security.
However, the position detection of the portable wireless device is within the communication range of the transmission antenna of the in-vehicle wireless device arranged on the vehicle side (with a response from the portable wireless device) or out of the communication range (no response from the portable wireless device) However, the presence or absence of a portable wireless device in the vehicle cannot be detected.
Further, providing a separate in-vehicle transmission antenna for detecting the presence or absence of a portable wireless device in the vehicle increases the cost.
[0006]
(2) In the smart entry system, when the number of transmission antennas of the in-vehicle wireless device arranged on the vehicle side is reduced, for example, it is desired to determine whether or not the portable wireless device exists in a square area as in the vehicle. In this case, since the transmitted encryption code request signal reaches an elliptical shape centered on the antenna, adjusting the transmission output so that the transmission radio wave does not leak from the square area will cause the corner of the square area to be out of the communication range. .
[0007]
(3) In the same situation as in (2) above, if the transmission output is adjusted so that the encryption code request signal reaches the corner of the square area, the transmission radio wave from the transmission antenna of the in-vehicle wireless device protrudes from the square area.
(4) In the smart entry, when a method of transmitting the encryption code request signal at a predetermined time interval is adopted, communication is interrupted if the portable wireless device is on the outer boundary of the transmission area of the encryption code request signal, and the transmission area Since the control in the case of being in the area and the control in the case of being out of the service area are alternately performed to be in the hunting state, some countermeasure is required.
[0008]
  The present invention has been made in view of the above points, and can be reduced in cost without impairing security and convenience.In addition, even when the portable wireless device is in the corner of the vehicle, the position can be accurately detected.An object is to provide an in-vehicle device remote control system.
[0009]
[Means for Solving the Problems]
  A vehicle-mounted device remote control system according to the present invention stores a predetermined encryption code, and transmits the stored predetermined encryption code in response to reception of an external encryption code request signal; An encryption code request signal transmitting antenna that is installed at a predetermined position in the center of both side surfaces in the vehicle toward the front of the vehicle, and that alternately transmits an encryption code request signal to the portable wireless device, and the encryption code request signal In-vehicle device control means for verifying the predetermined encryption code returned from the portable wireless device in response to reception of the encryption code and the encryption code stored in its own memory and controlling the in-vehicle device when the two encryption codes match In response to reception of the encryption code request signal transmitted alternately from the encryption code request signal transmitting antenna, a response returned from the portable wireless device is returned. Based on the reception state of the signal, Bei a vehicle wireless device having a position determining means of the mobile wireless device determines whether the portable radio apparatus is in either of the interior or exteriorIn addition, it is possible to make the encryption code request signal reach every corner in the vehicle by using a leaked radio wave coming from the wiring from the main body of the in-vehicle wireless device to the encryption code request signal transmitting antenna. It is what.
[0012]
Further, the encryption code request signal transmitting antenna of the in-vehicle device remote control system according to the present invention has a reduced number of coil turns on the upper side of the antenna.
[0013]
The encryption code request signal transmitting antenna of the in-vehicle device remote control system according to the present invention is such that the coil cross-sectional shape on the upper side of the antenna is narrowed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In addition, the same code | symbol represents the same or equivalent among each figure.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a basic configuration example of an in-vehicle wireless device used in an in-vehicle device remote control system according to the present invention.
Various in-vehicle devices to be controlled by the in-vehicle device remote control system according to the present invention include a door lock / unlock mechanism, a steering device lock / unlock mechanism, and an engine start prohibition / release mechanism. However, here, the case where the vehicle-mounted device to be controlled is a door lock / unlock mechanism will be described as an example.
[0016]
In FIG. 1, reference numeral 10 denotes an in-vehicle wireless device that is fixedly arranged in a vehicle, and the in-vehicle wireless device 10 has a transmission antenna (that is, an encryption code request signal transmission antenna) 11.
A transmission antenna (encryption code request signal transmission antenna) 11 is connected to a transmission unit 12, and the transmission unit 12 is connected to an ECU (electronic control unit) 20.
The ECU (electronic control unit) 20 supplies a transmission code to the transmitter 12, and the supplied transmission code is transmitted from the encryption code request signal transmitting antenna 11 as an encryption code request signal modulated at a low frequency of 134 kHz, for example. 2 is transmitted to the portable radio apparatus 50 shown in FIG.
The vehicle is provided with a receiving antenna 13 of the in-vehicle wireless device 10, and a signal (for example, a signal having a frequency of 300 MHz) received from the portable wireless device 50 received by the receiving antenna 13 is demodulated by the receiving unit 14. It is supplied to the ECU 20.
[0017]
The ECU 20 of the in-vehicle wireless device 10 has a built-in memory 25, and the memory 25 stores an encryption key corresponding to the encryption code request signal.
The memory 25 is a nonvolatile memory such as an EEPROM, and the stored contents are retained even when the power is turned off.
The door opening / closing detection unit 21 detects the individual opening / closing of all the doors and the individual locking / unlocking states of all the doors, and supplies the detection signals to the ECU 20.
The door lock / unlock state detection unit 22 detects the locked / unlocked state of each door and supplies the detection signal to the ECU 20.
[0018]
The ECU 20 is connected to a door lock unit 23 and a notification unit 24.
The door lock unit 23 is a lock / unlock mechanism for all doors. In addition, the notification unit 24 is a so-called answer back when the door is locked / unlocked, an answer back device for lighting a vehicle or sounding a horn, an alarm device for sounding a buzzer for various alarms, a status display A display device is included.
The vehicle-mounted device remote control system according to the present invention is controlled by the door lock / unlock mechanism of the door lock unit 23 or various devices of the notification unit 24 (answerback device, alarm device, display device). Etc.
[0019]
FIG. 2 is a block diagram showing a basic configuration example of a portable radio apparatus used in the in-vehicle device remote control system according to the present invention.
In FIG. 2, reference numeral 50 denotes a portable wireless device, and a memory 53 is built in the ECU 52 of the portable wireless device 50.
In the memory 53, the same encryption code (encryption key) as that stored in the memory 25 of the in-vehicle wireless device 10 described above is stored if it is legitimate.
As shown in the figure, the portable radio apparatus 50 has a transmission antenna 56 and a reception antenna 58.
The transmission antenna 56 is connected to the transmission unit 55, and the transmission unit 55 is connected to the ECU 52.
The receiving antenna 58 is connected to the receiving unit 57, and the receiving unit 57 is connected to the ECU 52.
[0020]
The interrogation signal in the encryption code request signal from the in-vehicle wireless device 10 received by the receiving antenna 58 is demodulated by the receiving unit 57 and supplied to the ECU 52.
Further, the ECU 52 reads out an encryption code (encryption key) corresponding to the above-described encryption code request signal from the memory 53, encrypts the question code in the encryption code request signal, creates a response signal, and supplies the response signal to the transmission unit 55. The signal is modulated by the transmission unit 55 and transmitted from the transmission antenna 56 to the in-vehicle wireless device 10 in the vehicle as a signal having a high frequency (for example, 300 MHz).
In addition, there is a lock key / unlock key for remote operation of door lock / unlock as a keyless entry function, and these signals are input from the operation detection unit 51 to the ECU 52.
[0021]
FIG. 3 shows a transmitting antenna (that is, an encryption code request signal transmitting antenna) 11 or a receiving antenna 13 of an in-vehicle wireless device 10 (not shown) disposed at a predetermined position in a vehicle (vehicle compartment) and a portable wireless device 50 outside the vehicle. It is a figure which shows typically the state which is communicating.
The method (partner authentication method) for confirming whether the portable wireless device 50 is a legitimate registered machine has been described as a so-called challenge-response method (secret key encryption-based partner authentication method) as an example.
In the figure, the encryption code request signal transmission antenna 11 of the in-vehicle wireless device 10 transmits an encryption code request signal having a frequency of 134 kHz. When the portable wireless device 50 receives this encryption code request signal (= question signal), it receives it. A return code (response signal) having a frequency of 300 MHz modulated with a response code (cipher text) created from the encryption key corresponding to the received question signal and the question code (plain text) is returned.
[0022]
A signal having a frequency of 300 MHz received by the receiving antenna 13 of the in-vehicle wireless device 10 disposed in the vehicle is demodulated by the receiving unit 14 and supplied to the ECU 20, and the ECU 20 receives the return code.
The in-vehicle wireless device 10 collates the transmitted query code (plain text) with the encrypted text created with the corresponding encryption key and the received return code (that is, the encrypted code from the mobile wireless device). Check if it is a regular registration machine.
For example, a low frequency (hereinafter also abbreviated as LF) with a frequency of 134 kHz is used as the encryption code request signal transmitted from the transmission antenna (encryption code request signal transmission antenna) 11 of the in-vehicle wireless device 10 to the portable wireless device 50. The reason is that the electromagnetic wave uses a magnetic field component whose intensity is inversely proportional to the cube of the distance so that the position of the portable wireless device 50 can be easily confirmed, and the communication distance is usually around 1 m. .
On the other hand, the UHF band (for example, frequency 300 MHz) is used for communication from the portable wireless device 50 to the receiving antenna 13 of the in-vehicle wireless device 10, and the communication distance is usually 5 to 20 m.
[0023]
FIG. 4 shows a situation where the carrier (holder) of the portable wireless device 50 leaves the vehicle, and FIG. 5 shows a situation where the carrier returns to the vehicle from a position away from the vehicle.
6 shows an operation timing chart of the in-vehicle wireless device (on-vehicle device) 10 and the portable wireless device (portable device) 50 in the situation of FIG. 4, and FIG. 7 shows the in-vehicle wireless device (in the situation of FIG. The operation | movement timing chart of the vehicle equipment 10 and the portable radio | wireless apparatus (portable machine) 50 is shown.
In FIG. 4, the above-mentioned LF (that is, a low-frequency encryption code request signal) is transmitted at predetermined intervals from the transmission antenna 11 of the in-vehicle wireless device 10 disposed in the vehicle, and the LF communication range (LF The inside of the reception limit 63 is referred to as the LF communication area and the outside is referred to as the LF communication area outside), and the carrier 60 holds the portable wireless device 50 in the pocket 61 with the vehicle door 64 closed, and is out of the LF communication area. Assuming that
(This carrier movement is called situation A.)
[0024]
FIG. 5 shows that the above-mentioned LF (that is, low-frequency encryption code request signal) is transmitted from the encryption code request signal transmitting antenna 11 of the in-vehicle wireless device 10 at predetermined intervals. Is assumed to have a portable wireless device 50 in the pocket 61 and enter the LF communication area. (This carrier movement is called situation B.)
Next, operations of the portable wireless device 50 and the in-vehicle wireless device 10 in the situation A of FIG. 4 will be described with reference to FIG.
The in-vehicle wireless device 10 transmits an encryption code request signal for the in-vehicle wireless device at predetermined intervals.
While the portable wireless device 50 is in the LF communication range, the portable wireless device 50 transmits a return code in response to the encryption code request signal.
[0025]
The in-vehicle wireless device 10 determines that the carrier 60 is near the vehicle by receiving a return signal (that is, a return code) from the portable wireless device 50, and controls the door to an unlocked state by the door lock unit. .
When the portable wireless device 50 moves out of the LF communication area, the portable wireless device 50 cannot receive the encryption code request signal and does not transmit a return code.
The in-vehicle wireless device 10 cannot receive the reply from the portable wireless device 50 for a predetermined time T1, and thus determines that the carrier 60 is no longer near the vehicle and controls the door to the unlocked state by the door lock unit.
[0026]
Next, operations of the portable wireless device 50 and the in-vehicle wireless device 10 in the situation B of FIG. 5 will be described with reference to FIG.
The in-vehicle wireless device 10 transmits LF (that is, an encryption code request signal) at predetermined intervals.
Since the portable wireless device 50 cannot receive the encryption code request signal while outside the LF communication area, the portable wireless device 50 does not transmit the return code.
The in-vehicle wireless device 10 determines that the carrier has not returned nearby because the reply code from the portable wireless device 50 does not come, and the door lock unit controls the door to be locked. It is out.
When the portable wireless device 50 moves into the LF communication area, the portable wireless device 50 can receive the encryption code request signal, and therefore the return code is transmitted.
The in-vehicle wireless device 10 continuously receives the return code for a predetermined time T2, thereby determining that the carrier 60 is nearby, and controls the door to the unlocked state by the door lock unit.
[0027]
FIG. 8 is a diagram illustrating an example of a control flowchart executed by the ECU 20 of the in-vehicle wireless device 10.
FIG. 9 is a diagram illustrating an example of a control flowchart executed by the ECU 52 of the portable wireless device 50.
First, the operation of the microcomputer (microcomputer) program built in the ECU 20 of the in-vehicle wireless device 10 will be described based on the flowchart of FIG.
When the ECU 20 starts from the reset state due to battery replacement or the like, the process starts from START (500), and the ECU 20 is initialized in step 501.
[0028]
In step 502, an encryption code request signal is transmitted to the portable wireless device 50 at predetermined intervals (for example, every 0.2 seconds), and the door is unlocked while there is a correct return code from the portable wireless device 50. When the return code is lost, the door is locked.
In step 503, the encryption code request signal is transmitted from the in-vehicle wireless device 10 to the portable wireless device 50 at predetermined time intervals (for example, 0.2 seconds).
In steps 504 and 505, it is determined whether a correct return code is returned from the portable wireless device 50 in response to the encryption code request signal transmitted from the in-vehicle wireless device 10.
The encryption code request signal transmitted from the transmission antenna 11 of the in-vehicle wireless device 10 to the portable wireless device 50 uses the above-mentioned LF.
Accordingly, the communication distance is normally around 1 m, and if there is a return code from the portable wireless device 50, it is estimated that the portable wireless device 50 exists within this communication distance range, so the process goes to step 506 for bringing the door into an unlocked state. Branch.
[0029]
On the other hand, if there is no return code from the portable wireless device 50, it is estimated that the portable wireless device 50 does not exist within this communication distance range, so the process branches to step 508 where the door is locked.
In step 506, the current door received from the door lock / unlock state detection unit 22 of the in-vehicle wireless device 10 is used, and if it is currently locked, the door is unlocked with respect to the door lock unit 23 in step 507. The drive request is output.
If the door is already unlocked in step 506, nothing is done.
In step 508, the current door received from the door lock / unlock state detection unit 22 is used, and if it is currently unlocked, a door lock drive request is output to the door lock unit 23 in step 509. To do.
If the door is already locked at step 508, nothing is done.
Return to A and repeat the process at every predetermined program processing cycle.
[0030]
Next, the control operation of the portable wireless device 50 will be described based on the flowchart of FIG.
When the ECU 52 of the portable radio apparatus 50 starts from a reset state due to battery replacement or the like, the process starts from START (600), and the ECU 52 is initialized at step 601 and enters a standby mode at step 602.
If there is reception (LF reception) from the in-vehicle wireless device 10 in step 603, WAKE UP (step 604) is performed to determine whether the received signal is a code request signal from the in-vehicle wireless device 10 (step 605). If it is determined that the signal is an encryption code request signal, a return code is transmitted (step 606).
Then, after the transmission is completed, the process returns to step 602.
If no interrogation signal is received in step 603 (ie, standby mode) or if it is not an encryption code request signal in step 605, the process goes to step 602.
[0031]
Thus, according to the present system, the user can lock or unlock the door of the vehicle only by carrying the portable wireless device 50 without performing key operation or remote control operation.
Therefore, it is very convenient that the door can be opened without bothering to take out the key even when holding the luggage in both hands or holding the key in the bag.
In addition, the system is automatically locked when leaving the vehicle, so the door lock is not inadvertently forgotten and the system is effective in terms of security.
However, if the portable wireless device 50 is left behind in the vehicle (vehicle interior), the door will not be locked even if the user leaves the vehicle, which poses a security problem.
Therefore, it is necessary to warn the user by detecting that the portable wireless device 50 is left in the vehicle (in the vehicle compartment).
[0032]
A control method that unlocks the door when the portable wireless device enters the LF wave (encryption code request signal) transmission area described above, and locks the door when the portable wireless device leaves the transmission area area ( In addition to the area method, there is also a method (switch method) that uses the communication activation switch shown in FIG.
In the switch system, instead of transmitting LF waves (that is, low-frequency encryption code request signals) from the vehicle side at predetermined time intervals, a switch attached to the vehicle by the user, for example, a door knob 100 as shown in FIG. If an LF wave (encryption code request signal) is transmitted in response to the operation of the communication activation switch 101 attached to the mobile phone 50, the portable wireless device 50 is within the LF wave transmission area and returns a return code. Reverse the locked / unlocked state of the door.
[0033]
In this method, when the user has left the portable wireless device 50 in the vehicle (in the vehicle compartment) and performs door lock control as usual, the user leaves the vehicle assuming that he has the portable wireless device 50.
In this state, when the communication activation switch 101 is operated by a third party, the door is unlocked, which causes a security problem.
Therefore, also in the case of this switch system control, as in the case of the area system control, a detection means for detecting whether the portable wireless device 50 is in the vehicle is required.
[0034]
As a means for detecting the presence / absence of the portable wireless device 50 in the vehicle (vehicle interior), there is a method in which a vehicle-determined antenna 104 is provided as shown in FIG.
In this method, the transmission output is adjusted so that the LF transmission wave (encryption code request signal does not leak outside the vehicle) from the in-vehicle determination dedicated antenna 104.
Therefore, if a return code is returned from the portable wireless device 50 in response to the LF transmission wave from the in-vehicle determination dedicated antenna 104, it can be determined that the portable wireless device 50 exists in the vehicle.
However, in the case of this system, there is a problem that the cost is increased because the vehicle-mounted antennas 102 and 103 for controlling the locking / unlocking of the door are separately required.
[0035]
Therefore, a method of reducing the number of antennas by using both the in-vehicle determination antenna and the outside antenna has been studied.
The basic principle of this method will be described with reference to FIGS.
12 to 15 are views of the vehicle as seen from above, and FIG. 12 shows that the encryption code request signal transmitting antennas 106 and 107 are installed in the doors 64 on the left and right sides of the vehicle.
The transmission waves from the encryption code request signal transmission antennas 106 and 107 propagate both inside the vehicle (in the vehicle interior) and outside the vehicle.
FIG. 13 shows a state where an encryption code request signal is transmitted from the antenna 106 of the right door.
The encryption code request signal reaches the inside of the vehicle and the outside area 110 on the right side of the vehicle, and the output is set so that it hardly leaks from the window on the left side of the vehicle.
[0036]
The area hatched by the downward slanting diagonal line shown in FIG. 13 is the encryption code request signal transmission area from the encryption code request signal transmitting antenna 106 installed inside the right door.
When the portable wireless device 50 is within the hatched area of the downward slanted right line when the encryption code request signal is transmitted from the encryption code request signal transmitting antenna 106 installed inside the right door, the portable wireless device 50 transmits the encryption code request signal. It receives and returns a return code to the in-vehicle wireless device 10.
If the in-vehicle wireless device 10 can receive the return code, the in-vehicle wireless device 10 determines that the portable wireless device 50 is within the hatched range of the right-downward oblique line in FIG.
[0037]
Next, FIG. 14 shows a state in which the encryption code request signal is transmitted from the encryption code request signal transmission antenna 107 installed inside the left door.
The encryption code request signal reaches the interior of the vehicle and the vehicle exterior area 111 on the left side of the vehicle, and the output is set so that it hardly leaks from the window on the right side of the vehicle.
In FIG. 14, the hatching range of the diagonal line rising to the right is the transmission range of the encryption code request signal from the antenna 107 of the left door.
When the portable wireless device 50 is within the hatched area of the right-upward oblique line when the encryption code request signal is transmitted from the encryption code request signal transmission antenna 107 of the left door, the encryption code request signal transmission antenna 106 of the right door shown in FIG. As in the case of, the presence / absence of a return code from the portable wireless device 50 detects that the portable wireless device 50 is within the hatched range of the right-upward and oblique lines in FIG.
[0038]
FIG. 15 is a diagram in which the encryption code request signal transmission areas shown in FIGS. 13 and 14 are overlapped, and the vehicle is added to the encryption code request signal from the encryption code request signal transmitting antenna disposed inside the left and right doors. The mode that the portable radio | wireless apparatus of an inside responds is shown typically.
If encryption code request signals are alternately transmitted from the encryption code request signal transmitting antennas 106 and 107 disposed at the left and right doors, and a return code can be received from the portable wireless device for both transmissions, it is shown in FIG. This means that the portable wireless device 50 is present in an area where both the right-down diagonal line and the right-up diagonal line overlap, and the area coincides with the area inside the vehicle.
[0039]
With this method, it is possible to determine whether or not the portable wireless device 50 exists in the vehicle (vehicle interior).
That is, if the return code can be received from the portable wireless device 50 for any of the encryption code request signals transmitted from the encryption code request signal transmitting antennas 106 and 107 disposed on the left and right doors, the portable wireless device 50 It can be determined that the vehicle is in the vehicle.
That is, the position of the portable wireless device 50 can be determined.
[0040]
Therefore, while it is determined that the portable wireless device 50 is in the vehicle, if the vehicle operator tries to lock the door by going outside the vehicle without holding the portable wireless device 50, the door cannot be locked. The alarm unit 24 of the in-vehicle wireless device can generate an alarm such as sounding a horn and can call attention for preventing the portable wireless device 50 from being left behind, thereby improving the security performance.
Further, as described above, the code request signal transmission from the left and right door antennas 106 and 107 propagates to the signal transmission areas 110 and 111 outside the vehicle, so that it can be used for door lock / unlock control.
Therefore, the antenna 106 for the right side door and the antenna 107 for the left side door can be used both as an antenna for in-vehicle determination of the portable wireless device and an antenna for door lock / unlock control outside the vehicle, thereby reducing the cost and the number of parts. Also.
[0041]
However, when the encryption code request signal transmitting antenna is installed inside the door as shown in FIG. 12 or when the encryption code request signal transmitting antenna 102 is installed inside the door knob 100 as shown in FIG. The
(1) The encryption code request signal transmitting antenna needs to be waterproofed.
(2) There are many obstacles such as structures and metal parts inside the door and around the door knob, and it is not easy to design the installation place of the encryption code request signal transmitting antenna avoiding them.
(3) Since the wiring from the vehicle body to the door passes through the door hinge portion, the wiring must be bent and the number of wirings cannot be increased to ensure smooth door operability.
(4) The position of the encryption code request signal transmitting antenna is moved when the door is opened.
[0042]
As a countermeasure, a method of installing the encryption code request signal transmitting antenna 112 in the seat back 113 of the driver's seat or the passenger seat as shown in FIG. 17 is conceivable. However, the encryption code request signal can be obtained by moving the seat back and forth or tilting the backrest. There is a problem in that the position of the transmitting antenna changes and the position of the portable wireless device 50 cannot be estimated accurately.
In order to solve this problem, there is a system in which an encryption code request signal transmitting antenna is provided at the inner lower part of the center pillar described below.
[0043]
The method of providing the encryption code request signal transmitting antenna in the lower part inside the center pillar is the most characteristic feature of the in-vehicle device remote control system according to the present invention, and will be described with reference to FIGS.
18, 19, and 20 show examples of installation locations of LF transmission antennas (for example, a low-frequency encryption code request signal transmission antenna having a frequency of 134 kHz).
FIG. 18 is a view of the center pillar on the right side of the vehicle from the inside of the vehicle. As shown in FIG. 18, the encryption code request signal transmitting antenna 116 is installed on the back side of the interior 115 at a position lower than the window on the inside of the center pillar vehicle. To do.
[0044]
FIG. 19 is a view of the interior 115 below the window inside the center pillar vehicle as viewed from the center pillar side toward the center of the vehicle, that is, the back side of the interior 115.
As shown in FIG. 19, the encryption code request signal transmitting antenna 116 is installed on the back side of the interior 115.
The encryption code request signal transmitting antenna on the left side of the vehicle is installed in the same manner as the right side antenna in FIG.
[0045]
FIG. 20 is a view of the encryption code request signal transmitting antenna 116 when viewed from the top of the vehicle. The encryption code request signal transmitting antenna 116 is mounted on the back side of the interior 115 covering the left and right center pillars 123 as viewed from inside the vehicle. It shows how they are doing.
21 and 22 show the communication area of the encryption code request signal transmitted from the encryption code request signal antenna 116 attached to the right center pillar by hatching, and FIG. 21 is a top view of the vehicle. FIG. 22 shows a case (viewed from the front of the vehicle) when viewed from the front of the vehicle.
[0046]
As shown in FIGS. 21 and 22, the encryption code request signal output from the encryption code request signal transmission antenna 116 reaches not only the vehicle inner side direction but also the center pillar to the outside of the vehicle.
As described above, the encryption code request signal transmitting antenna 116 is preferably attached to a portion (see FIG. 18) lower than the window inside the center pillar at the center of the vehicle longitudinal direction.
[0047]
As a result, as shown in FIGS. 21 and 22, the communication area of the encryption code request signal transmitting antenna 116 can be the entire interior of the vehicle interior and the vicinity of the entrance / exit of the front and rear seat doors (outside the vehicle).
In addition, in the vehicle lateral direction, the inside and outside of the vehicle can be set as a communication area with a good balance.
Further, in the vertical direction of the vehicle, if the attachment position of the encryption code request signal transmitting antenna 116 is too low, the transmission area outside the vehicle becomes too narrow, and conversely if it is attached at a high position, the feet outside the vehicle are out of the communication range.
21 and 22 show the case where the encryption code request signal transmission antenna 116 is attached to the center pillar on the right side of the vehicle. Similarly, the encryption code request signal transmission antenna 116 is also attached to the center pillar on the left side of the vehicle. It is attached.
[0048]
As described above, the in-vehicle device remote control system according to the present embodiment has the encryption code request signal transmission antenna of the in-vehicle wireless device set at a predetermined position in the center of both the left and right sides in the vehicle, for example, inside the left and right center pillars. It is characterized by being mounted at a position somewhat lower than the window.
As a result, the encryption code request signal transmitting antenna can be used for both the determination of whether the portable wireless device is left in the vehicle and the door lock / unlock control outside the vehicle, and the cost and the number of parts can be reduced.
In addition, the vicinity of the doorway of the four front and rear doors can be reliably set as a door lock / unlock control target area, and the number of installed parts such as an antenna on the door can be reduced.
[0049]
Embodiment 2. FIG.
The position where the encryption code request signal transmitting antenna is attached is lower than the window inside the center pillar, but the transmission range in the space without an obstacle is close to an elliptical sphere and does not coincide with the interior of the vehicle having a shape close to a rectangular parallelepiped.
As described in the first embodiment, the encryption code request signal transmitted when determining whether or not the portable wireless device 50 exists in the vehicle is opposite to the center pillar to which the encryption code request signal transmission antenna is attached. Adjust the output so that it does not leak out of the car through the side window.
However, in the case of a vehicle having a long vehicle interior shape and a high vehicle height, it is transmitted from the encryption code request signal transmitting antenna 116 on the right side of the vehicle as shown in FIG. 23 (viewed from the top of the vehicle) and FIG. 24 (viewed from the front of the vehicle). The encryption code request signal may not reach the left front and rear corner floor portions (shaded area) in the vehicle.
[0050]
It is conceivable that the portable wireless device 50 is placed in the shaded area, or the portable wireless device 50 is dropped in the shaded area on the floor without the user's knowledge.
If the portable wireless device 50 is in that area, the encryption code request signal from the right encryption code request signal transmission antenna does not reach, and communication is possible only from the left encryption code request signal transmission antenna. It is determined that the vehicle is outside the vehicle, and no warning is given to leave the portable wireless device in the vehicle.
In this way, when the portable wireless device 50 is in the vehicle, the leakage from the encryption code request signal transmission antenna wiring described below is intended to solve the situation where the encryption code request signal cannot be received from both the left and right antennas. This is a transmission range expansion method using radio waves.
[0051]
A second embodiment using a transmission range extending method using leakage radio waves from the wiring of the encryption code request signal transmitting antenna 116 will be described with reference to FIGS. 25 and 26. FIG.
FIG. 25 (vehicle top view) shows a route of the wiring 120 from the in-vehicle wireless device 10 to the encryption code request signal transmitting antenna 116.
There is some leakage radio wave in the wiring 120 to the encryption code request signal transmitting antenna 116.
FIG. 25 shows a region where there is a leaked radio wave from the wiring 120 from the in-vehicle wireless device 10 to the encryption code request signal transmitting antenna 116, and the shaded portion indicates a region where communication is possible due to the leaked radio wave.
23 is passed through the hatched area where transmission from the encryption code request signal transmitting antenna on the right side shown in FIG. 23 does not reach, as shown in FIG. 25, the hatched area in FIG. The request signal transmission range can be set.
[0052]
FIG. 26 shows a state when FIG. 25 is viewed from the front of the vehicle. In FIG. 24, the right encryption code request signal transmission antenna wiring 120 is arranged in the shaded area in the left floor corner where the signal from the right transmission antenna 116 does not reach. By passing it through, it is possible to make the encryption code request signal transmission range by the leaked radio wave (shaded area in FIG. 24) from the wiring.
Similarly to FIGS. 25 and 26, the wiring of the encryption code request signal transmission antenna on the left side of the vehicle is also routed so that the transmission impossible area of the left encryption code request signal transmission antenna is covered by the leaked radio wave from the wiring.
Even if the output is adjusted low, the encryption code request signal is transmitted to every corner of the entire vehicle so that the encryption code request signal does not leak from the window opposite to the encryption code request signal transmitting antenna arranged in this way. be able to.
[0053]
Embodiment 3 FIG.
As another method for minimizing unnecessary leakage of the encryption code request signal to the outside of the vehicle and making the entire area in the vehicle to be a communication area, the following method may be mentioned.
When the transmission output is increased so that the encryption code request signal reaches every corner of the vehicle, the signal leaks from the window on the opposite side of the vehicle inside the encryption code request signal transmission antenna. Specifically, there is a method of adjusting the output above the antenna by reducing the number of turns of the coil of the encryption code request signal transmitting antenna on the upper side.
[0054]
FIG. 27, FIG. 28, FIG. 29, FIG. 27 shows the third embodiment that adjusts the output above the encryption code request signal transmission antenna by reducing the number of turns of the coil of the encryption code request signal transmission antenna on the upper side. 30 will be used for explanation.
First, an example in the case of not being Embodiment 3 will be described with reference to FIG. 27 (a view of the vehicle viewed from above).
When the output level is adjusted so that the encryption code request signal reaches the corner of the floor in the vehicle, the window on the facing side of the center pillar to which the encryption code request signal transmitting antenna 116 is attached looks like the hatched area shown in FIG. The signal leaks.
This leakage is from a window without a door, which is a conductive shield, as shown in FIG.
[0055]
Therefore, in order to reduce the transmission output upward from the encryption code request signal transmission antenna, the number of turns of the antenna coil is reduced at the upper part of the antenna.
An example of how to wind the coil in this case is shown in FIG.
In FIG. 28, 124 is a coil conductor (coil), and the winding method of the coil is that all the conductors of the loop are in series and the direction of winding of the coil is also matched.
Then, as shown in FIG. 28, a part of the loop is not wound up to the upper part but is a small loop halfway.
In the example of FIG. 29, a coil lead wire (coil) 124 is wound around a bobbin 125, and the number of loops below the encryption code request signal transmission antenna is increased.
Then, as shown in FIG. 30, the encryption code request signal transmitting antenna 116 is attached to the back of the interior 115 at the lower part of the center pillar with the side with the large number of turns facing down.
[0056]
FIG. 31 is a diagram showing leakage of an encryption code request signal from a facing window on the antenna installation side when an encryption code request signal transmitting antenna having such a coil winding method is used.
As apparent from the comparison with FIG. 22, according to the present embodiment, it is possible to reduce the leakage of the encryption code request signal from the facing window on the antenna installation side.
Therefore, according to the present embodiment, the number of coil turns of the encryption code request signal transmission antenna 116 is reduced at the upper part of the antenna, thereby adjusting the output above the antenna and attaching the encryption code request signal transmission antenna to the center. It is possible to minimize the area where the encryption code request signal leaks from the window facing the pillar and the vehicle, and it is possible to accurately determine whether the portable wireless device is left in the vehicle.
[0057]
Embodiment 4 FIG.
As in the case of the third embodiment described above, when the transmission output is increased so that the encryption code request signal reaches every corner in the vehicle, the encryption code request signal is transmitted to the center pillar and the vehicle equipped with the encryption code request signal transmission antenna. As another method for minimizing the area leaking from the window on the inner facing side, the coil cross-sectional shape of the encryption code request signal transmission antenna is narrowed at the top, and the output above the encryption code request signal transmission antenna is adjusted. There is.
[0058]
Embodiment 4 using a method of adjusting the output above the antenna by narrowing the coil cross-sectional shape of the encryption code request signal transmitting antenna on the upper side will be described with reference to FIGS. 32 and 33. FIG.
FIG. 32 shows an example of the coil shape.
In the figure, reference numeral 124 denotes a coil conductor (coil), and the winding method of the coil is such that all the loop conductors are in series and the winding direction of the coil is also matched.
Further, as shown in FIG. 32, the coil cross-sectional shape is narrowed toward the top, and the transmission output above the encryption code request signal transmission antenna is suppressed.
[0059]
In the example of FIG. 33, a coil 124 is wound around a bobbin 125, and the cross-sectional seat below the encryption code request signal transmitting antenna is widened.
By using an encryption code request signal transmitting antenna having such a coil cross-sectional shape that is trapezoidal or substantially triangular, as in the case of the third embodiment, from the window on the facing side on the encryption code request signal transmitting antenna installation side. It is possible to minimize the leakage of the encryption code request signal, and it is possible to accurately determine whether the portable wireless device is left in the vehicle.
[0060]
Embodiment 5. FIG.
By the above-described method, the inside / outside vehicle encryption code request signal transmitting antenna mounted at a position lower than the windows inside the left and right center pillars is used for in-vehicle determination of the portable wireless device and door lock / unlock control outside the vehicle. Thus, it is possible to transmit an accurate encryption code request signal to the area.
However, when the portable wireless device exists on the inner and outer boundary lines of the door lock / unlock determination area outside the vehicle, the encryption code request signal from the vehicle encryption code request signal transmission antenna reaches or reaches the portable wireless device 50. It will disappear.
[0061]
Therefore, the return code from the portable wireless device 50 is interrupted, causing a problem that hunting in which the door is repeatedly locked and unlocked occurs.
An attempt to solve this is a method of providing hysteresis in the encryption code request signal transmission output described below.
Embodiment 5 using a method of providing hysteresis in the encryption code request signal transmission output will be described with reference to FIGS. 33 and 35. FIG.
FIG. 34 is a block diagram of an encryption code request signal transmission circuit of the in-vehicle wireless device in the in-vehicle device remote control system according to the present embodiment.
As shown in the figure, the encryption code request signal from the microcomputer 130 is converted into a low-frequency signal by the transmission unit 131.
[0062]
The next-stage transmission output switching unit 132 has a function of switching the transmission output level of the encryption code request signal to two or more times, and the output can be switched by an instruction of the output switching signal 133 from the microcomputer 130. ing.
The encryption code request signal output from the transmission output switching unit 132 is transmitted from the left and right encryption code request signal transmitting antennas 116 and 117.
This transmission output switching is provided in both the left and right transmission circuits. FIG. 35 shows a communication area of the encryption code request signal transmitted from the output circuit with the transmission output switching unit of FIG.
[0063]
FIG. 35 shows a case where the output switching signal 133 from the microcomputer 130 is in two stages. In FIG. 35, an inner area 140 of symbol A is within the encryption code request signal range when the output switching signal from the microcomputer 130 indicates a weak level in two stages.
Further, an inner area 141 of the code C indicates an encryption code request signal transmission area when the output switching signal from the microcomputer 130 indicates a strong level in two stages.
Then, the difference area B is used as hysteresis.
In operation, the door is unlocked when the portable wireless device 50 enters the communication range from outside the communication range of A, and conversely, the door is locked when the portable wireless device goes out of the communication range from the communication range of C.
Once the lock or unlock operation is performed, the lock / unlock will not be reversed unless the portable wireless device moves at least the width of the His area of B. Lock control will no longer hunting.
[0064]
Hysteresis in the region B can be provided in the same manner for the transmission of the encryption code request signal from the left antenna, thereby preventing hunting.
As described above, in this embodiment, the strength of the transmission output of the encryption code request signal can be switched in two or more stages, the encryption code request signal transmission wave reachable range is changed depending on the strength, and the difference is calculated. By setting the hysteresis of the execution condition of the door lock / unlock control, the door lock / unlock control is performed without causing a hunting phenomenon even when the portable wireless device is on the inner and outer boundaries of the transmission wave reachable range. It becomes possible.
[0065]
【The invention's effect】
  A vehicle-mounted device remote control system according to the present invention includes a portable wireless device that stores a predetermined encryption code and transmits the stored predetermined encryption code in response to reception of an external encryption code request signal, and a vehicle front An encryption code request signal transmitting antenna that is installed at a predetermined position in the center of both side surfaces in the vehicle toward the direction and alternately transmits an encryption code request signal to the portable wireless device, and responds to reception of the encryption code request signal In-vehicle device control means for verifying the predetermined encryption code returned from the portable wireless device and the encryption code stored in its own memory, and controlling the in-vehicle device when the two encryption codes match, an encryption code request signal Based on the reception status of the return signal returned from the portable wireless device in response to the reception of the encryption code request signal transmitted alternately from the transmission antenna, Bei a vehicle wireless device wireless device having a position determining means of the mobile wireless device determines whether the one of the interior or exteriorIn addition, the encryption code request signal can be delivered to every corner of the vehicle by using the leaked radio wave from the wiring from the main body of the in-vehicle wireless device to the encryption code request signal transmission antenna. The request signal transmission antenna can be used both for determining whether the portable wireless device is left in the vehicle and for controlling the operation of the in-vehicle device. This reduces the cost and the number of parts without sacrificing security performance and convenience. Even when the wireless device is at a corner in the vehicle, the position can be detected with higher accuracy.
[0068]
In addition, since the encryption code request signal transmission antenna of the in-vehicle device remote control system according to the present invention has a reduced number of coil turns on the upper side of the antenna, the output above the encryption code request signal transmission antenna is adjusted and the antenna is mounted. Thus, it is possible to minimize the area where the encryption code request signal leaks from the window facing the vehicle at the position where the mobile wireless device is left in the vehicle.
[0069]
In addition, since the encryption code request signal transmitting antenna of the in-vehicle device remote control system according to the present invention has a narrower coil cross-sectional shape on the upper side of the antenna, the antenna is mounted in the same manner as when the number of coil turns is reduced on the upper side of the antenna. Thus, it is possible to minimize the area where the encryption code request signal leaks from the window facing the vehicle at the position where the mobile wireless device is left in the vehicle.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a basic configuration example of an in-vehicle wireless device used in an in-vehicle device remote control system according to Embodiment 1;
FIG. 2 is a block diagram showing a basic configuration example of a portable wireless device used in the in-vehicle device remote control system according to the first embodiment.
FIG. 3 is a diagram schematically showing a state in which a transmitting antenna or a receiving antenna of a vehicle-mounted wireless device is communicating with a portable wireless device.
FIG. 4 is a diagram illustrating a situation in which a portable user of a portable wireless device leaves a vehicle.
FIG. 5 is a diagram illustrating a situation where a portable radio device carrier returns to the vehicle.
6 is a diagram showing an operation timing chart of the in-vehicle wireless device (on-vehicle device) and the portable wireless device (portable device) in the situation of FIG. 4;
7 is a diagram showing an operation timing chart of the in-vehicle wireless device (on-vehicle device) and the portable wireless device (portable device) in the situation of FIG. 5;
FIG. 8 is a diagram illustrating an example of a control flowchart executed by the ECU of the in-vehicle wireless device.
FIG. 9 is a diagram illustrating an example of a control flowchart executed by the ECU of the mobile wireless device.
FIG. 10 is a diagram showing an example when a communication activation switch is installed on a door knob.
FIG. 11 is a diagram illustrating an example of a case where an in-vehicle determination dedicated transmission antenna is installed.
FIG. 12 is a diagram showing an example when an encryption code request signal transmitting antenna is installed inside a door.
FIG. 13 is a schematic diagram showing a state in which a portable wireless device outside the vehicle responds to an encryption code request signal from an encryption code request signal transmission antenna inside the right door.
FIG. 14 is a schematic diagram showing a state where a portable wireless device outside the vehicle responds to an encryption code request signal from an encryption code request signal transmission antenna inside the left door.
FIG. 15 is a schematic diagram showing a state in which the portable wireless device in the vehicle responds to the encryption code request signal from the encryption code request signal transmission antenna inside the left and right doors.
FIG. 16 is a diagram showing an example when an encryption code request signal transmitting antenna is incorporated in a doorknob.
FIG. 17 is a diagram illustrating an example in which an encryption code request signal transmission antenna is incorporated in a seat back portion.
FIG. 18 is a diagram showing an example when an encryption code request signal transmitting antenna is incorporated in the lower part inside the center pillar.
FIG. 19 is a diagram showing a state in which an encryption code request signal transmitting antenna is incorporated in the lower part inside the center pillar.
FIG. 20 is a diagram showing an example in which an encryption code request signal transmitting antenna is incorporated in the lower left and right center pillars.
FIG. 21 is a diagram showing a communication region viewed from the top of the vehicle when an encryption code request signal transmitting antenna is incorporated in the lower part on the inner side of the right center pillar.
FIG. 22 is a diagram showing a communication area viewed from the front of the vehicle when an encryption code request signal transmitting antenna is incorporated in the lower part on the inner side of the right center pillar.
FIG. 23 is a view of the case where the encryption code request signal from the encryption code request signal transmission antenna incorporated in the lower part inside the center pillar does not reach the corner in the vehicle, as viewed from the upper surface of the vehicle.
24 is a view of the state of FIG. 23 as viewed from the front of the vehicle.
FIG. 25 is a diagram for explaining a characteristic configuration of an in-vehicle electronic device remote control system according to a second embodiment;
26 is a view of the state of FIG. 25 as viewed from the front of the vehicle.
FIG. 27 is a diagram showing a state in which an encryption code request signal from an encryption code request signal transmission antenna installed in the lower part inside the center pillar leaks from a window on the opposite side to the encryption code request signal transmission antenna.
FIG. 28 is a diagram showing a characteristic configuration of an encryption code request signal transmission antenna used in the in-vehicle electronic device remote control system according to the third embodiment.
FIG. 29 is a diagram showing another example of the encryption code request signal transmitting antenna used in the in-vehicle electronic device remote control system according to the third embodiment.
30 is a diagram showing a state in which an encryption code request signal transmission antenna used in the in-vehicle electronic device remote control system according to Embodiment 3 is installed in the lower part inside the center pillar. FIG.
FIG. 31 is a diagram showing leakage of an encryption code request signal to the outside when an encryption code request signal transmission antenna used in the in-vehicle electronic device remote control system according to the third embodiment is installed at the lower part inside the center pillar.
FIG. 32 is a diagram showing a configuration of an encryption code request signal transmitting antenna used in the in-vehicle electronic device remote control system according to the fourth embodiment.
FIG. 33 is a diagram showing another example of the encryption code request signal transmitting antenna used in the in-vehicle electronic device remote control system according to the fourth embodiment.
FIG. 34 is a block diagram showing a configuration of an encryption code request signal transmission circuit of an in-vehicle wireless device in an in-vehicle device remote control system according to a fifth embodiment.
FIG. 35 is a diagram for describing an example in which the strength of encryption code request signal transmission is switched and hysteresis is provided in a transmission range area in the fifth embodiment.
[Explanation of symbols]
10 In-vehicle wireless device
11 Encryption code request signal transmitting antenna 12 Transmitter
13 Receiving antenna 14 Receiver
20 ECU (Electronic Control Unit) 21 Door Open / Close Detection Unit
22 Door lock / unlock detector 23 Door lock
24 Notification unit 25 Memory
50 Portable wireless devices
51 Operation Detection Unit 52 ECU (Electronic Control Device)
53 Memory 54 Notification Unit
55 Transmitter 56 Transmitting antenna
57 receiver 58 receiving antenna
60 carryers 61 pockets
63 Receiving limit of encryption code request signal 64 Vehicle door
100 door knob 101 communication activation switch
102 Right door knob encryption code request signal transmitting antenna
103 Encryption code request signal transmitting antenna for left door knob
104 Dedicated antenna for in-vehicle determination
106 Encryption code request signal transmitting antenna inside right door
107 Encryption code request signal transmitting antenna inside left door
110 Right encryption code request signal arrival area
111 Left encryption code request signal arrival area
112 Encryption code request signal transmitting antenna
113 Seat back
115 Interior of center pillar inner surface
116 Encryption code request signal transmitting antenna
117 Encryption code request signal transmitting antenna
120 Wiring from in-vehicle wireless device to encryption code request signal transmitting antenna
123 Center pillar
124 Coil conductor (coil) 125 Coil bobbin
130 Microcomputer 131 Transmitter
132 Transmission output switching unit 133 Output switching signal
140 Communication area when encryption code request signal output is weak
141 Communication range when encryption code request signal output is strong

Claims (3)

A portable wireless device that stores a predetermined encryption code and transmits the stored predetermined encryption code in response to reception of an external encryption code request signal;
An encryption code request signal transmitting antenna that is installed at a predetermined position in the center of both side surfaces in the vehicle toward the front of the vehicle and that alternately transmits an encryption code request signal to the portable wireless device, and the encryption code request signal In-vehicle device control means for verifying the predetermined encryption code returned from the portable wireless device in response to reception of the encryption code and the encryption code stored in its own memory and controlling the in-vehicle device when the two encryption codes match The portable wireless device is installed in the vehicle based on the reception state of the return signal returned from the portable wireless device in response to the reception of the encrypted code request signal transmitted alternately from the encryption code request signal transmitting antenna. An in-vehicle wireless device having a portable wireless device position determining means for determining whether it is outside the vehicle ,
The encryption code request signal can be delivered to every corner of the vehicle by using a leaked radio wave emitted from a wiring from the main body of the in-vehicle wireless device to the encryption code request signal transmitting antenna. In-vehicle device remote control system. The in-vehicle device remote control system according to claim 1, wherein the encryption code request signal transmitting antenna has a reduced number of coil turns on the upper side of the antenna. The in-vehicle device remote control system according to claim 1, wherein the encryption code request signal transmitting antenna has a narrower coil cross-sectional shape on the upper side of the antenna.

Images