JP3840375B2 - Keyless entry device for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a keyless entry device for a vehicle, and more particularly, to a device that accurately detects the location of an electronic key and performs control appropriately.
[0002]
[Prior art]
A vehicle keyless entry configured to intermittently transmit an electromagnetic induction signal for activating an electronic key from a vehicle-side transmission / reception device, and to lock and unlock the door lock device according to an identification signal transmitted from the electronic key The device is known. In such a device, the control procedure is usually different between when the electronic key carrier is outside the vehicle and when the electronic key is in the vehicle, and malfunction may occur if the location of the electronic key is not accurately detected. was there.
[0003]
[Problems to be solved by the invention]
The present invention pays attention to this point, and an object thereof is to prevent the malfunction by accurately detecting the location of the electronic key.
[0004]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides:In the keyless entry device that activates the in-vehicle device mounted on the vehicle according to the communication result with the electronic key,Sends an electromagnetic induction signal to activate the electronic key to the passenger compartmentThe in-vehicle antenna and the in-vehicle antenna that transmits the electromagnetic induction signal to the outside of the passenger compartment, and the transmitted electromagnetic induction signalA transmission / reception device that receives an identification signal transmitted from an electronic key in response to the output and outputs an operation signal according to the identification signal, and a drive device that drives an in-vehicle device according to the output operation signalWhen,Door sensor that detects opening and closing of doorsIf there is a response of the identification signal when the electromagnetic induction signal is transmitted from the vehicle antenna, the location of the electronic key is determined to be indoors, and the response of the identification signal is transmitted when the electromagnetic induction signal is transmitted from the vehicle antenna. If there is, the location of the electronic key is determined to be outside the room,When door opening is detectedWhile the door is openThe transmission cycle of the electromagnetic induction signal transmitted intermittently is shortened.Here, the drive device for driving the above-mentioned in-vehicle device is, for example, an operation knob solenoid for making the operation knob of the ignition switch operable, a door lock actuator, other driving means for other in-vehicle devices, and driving by an actuator. Door lock device or the like.
[0005]
  With such a configuration, the location of the electronic key changes from the inside of the vehicle to the outside of the vehicle or vice versa as the vehicle is moved up and down, and the vehicle side changes due to a short transmission cycle of the electromagnetic induction signal when the door is often changed. Communication between the transmitter / receiver and the electronic key is performed closely. Therefore, appropriate control without malfunction is performed while accurately detecting the location of the electronic key, and responsiveness is improved.
[0006]
  In the above apparatus, the vehicle exterior antenna is disposed at the center pillar between the front door and the rear door of the vehicle, and the vehicle interior antenna is disposed at the center console. With such a configuration, it is possible to avoid duplication of communication areas of the respective antennas, and malfunction due to interference or the like is prevented.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described. FIG. 1 is a block diagram showing the configuration of the entire apparatus, and FIG. 2 is a block diagram showing the configuration of an electronic key. In the figure, 1 is a keyless entry device according to the present invention, 2 is an electronic key, 3 is a vehicle side device having a transmission / reception device 4 and various related devices. This keyless entry device 1 is composed of an electronic key 2 and a vehicle-side device 3, but it is not only for locking and unlocking the door but also for the steering lock device and the ignition switch even when the battery of the electronic key 2 is exhausted. It also has an immobilizer function that can be controlled on and off.
[0008]
The electronic key 2 is carried by the user (driver) in principle and has a transponder function. As shown in FIG. 2, the electronic key side control unit 21 having a CPU, the electronic key The side transmitter / receiver 22, the electromagnetic induction signal receiving antenna 23 and the response signal transmitting antenna 24, the manual transmission switch 25, the alarm generating buzzer 26, the power supply battery 27, the transponder 28, and the like. The control unit 21 is provided with various circuits necessary for a predetermined operation in addition to the CPU, and the manual transmission switch 25 is for manually transmitting a door lock / unlock command. The transponder 28 receives an electromagnetic induction signal from a dedicated antenna 41b, which will be described later, operates with its electromotive force, and transmits an identification signal corresponding to the received electromagnetic induction signal. For example, a relatively low frequency of 125 kHz is used for the electromagnetic induction signal, and a high frequency of 315 MHz is used for the response signal. The electronic key 2 is in the form of a card, and in the flowchart shown in FIG. 3 and below, “card” means the electronic key 2, but the shape of the electronic key 2 is a normal manual operation key, That is, other shapes such as a manual key and an electronic key circuit unit may be used.
[0009]
As shown in FIG. 1, the transmission / reception device 4 of the vehicle-side device 3 includes a vehicle-side control unit 41 and a vehicle-side transmission / reception unit 42 that include a CPU. The control unit 41 is attached with an immobilizer control circuit 41a for controlling a steering lock device (hereinafter referred to as STL) having a dedicated antenna 41b. The control circuit 41a and the antenna 41b are located in the vicinity of the ignition switch. Are arranged. The transmitter / receiver 42 is connected with an in-vehicle antenna 51 and an out-of-vehicle antenna 52 for transmitting electromagnetic induction signals, and an antenna 53 for receiving a response signal from the electronic key 2. The in-vehicle antenna 51 is for transmitting to the electronic key 2 in the vehicle interior, and is disposed, for example, in the center console of the vehicle, and is configured to transmit an electromagnetic induction signal to the entire interior of the vehicle interior. The vehicle exterior antenna 52 is used for transmission to the electronic key 2 outside the vehicle compartment, and is disposed, for example, at the center pillar between the front door and the rear door of the vehicle.
[0010]
Further, a sensor 54, a drive device 55, a notification device 56, an ignition switch 57, and the like are connected to the transmission / reception device 4. Examples of the sensor 54 include various sensors such as a door sensor 54a, a will confirmation sensor 54b, and a lock sensor 54c. The door sensor 54a is appropriately provided on the trunk door as well as each door for getting on and off. As the drive device 55, for example, an operation knob solenoid 55a that enables operation of an operation knob of an ignition switch, a door lock actuator 55b, and other drive means such as an in-vehicle device 55c, a door lock driven by the actuator 55b. There is a device 55d and the like. As the notification device 56, for example, a buzzer 56a, a hazard lamp 56b, an indicator lamp 56c, and the like are appropriately used. Reference numeral 57 a denotes an operation knob of the ignition switch 57.
[0011]
As described above, this type of vehicle keyless entry device is configured such that the door is automatically unlocked when the person carrying the electronic key approaches the vehicle, and the door is automatically locked when leaving the vehicle. Is common. In the apparatus according to this embodiment, the door is not simply locked / unlocked according to the location of the electronic key, but other operations and procedures necessary for locking / unlocking are added, or a function for generating an alarm is added. This greatly reduces the possibility of theft.
[0012]
The operation will be described below with reference to the flowchart shown in the figure. 3 to 5 are flowcharts showing the basic operation of the control unit 41 of the vehicle side device 3, FIG. 6 is a flowchart showing the basic operation of the control unit 21 of the electronic key 2, and FIGS. 7 and 8 are controls related to steering lock control. A flowchart showing the operation of the circuit 41a, and FIG. 9 is a flowchart of an alarm routine.
[0013]
In FIG. 3, the transmitter / receiver 4 initialized in step S1 transmits electromagnetic induction signals from the antennas 51 and 52 in step S2, holds this state, proceeds to hold in step S3, and stands by. In principle, the electromagnetic induction signal may be transmitted continuously, but here, for example, the electromagnetic induction signal is intermittently transmitted every 0.1 seconds with a period of 0.68 seconds. This is useful for reducing the consumption of the power battery of the vehicle. In this state, when the user of the electronic key 2 approaches within 1 m, for example, the operation on the electronic key 2 side as shown in FIG. 6 is started.
[0014]
In FIG. 6, step S201 is a state in which the battery 27 is inserted and initialized, and the process proceeds to step S202 that enables external interruption, and input of each signal can be accepted. Subsequently, in step S203, the CPU of the control unit 21 is held to be in a dormant state, and in step S204, signal input from other than the antenna, that is, external interruption is prohibited to prevent malfunction. Here, when the electromagnetic induction signal is input from the antenna 23, it is determined in step S205 that the input is from the antenna. If the input is from the antenna, the process proceeds to step S210 to read the signal and remove chattering and the like. Correct the signal.
[0015]
In the next step S211, it is determined whether or not the input signal is a proximity search signal. If so, the process proceeds to step S212 to set a response neighborhood code. This neighborhood code does not need to be encrypted, and simply responds. If it is not a proximity search signal in step S211, the process proceeds to step S213 to determine whether or not the input signal is a challenge code. If it is a challenge code, encryption is performed in step S214. This challenge will be described later. In step S215, the signal set in S212 or S214 is transmitted from the antenna 24, and the process returns to step S202. If it is not a challenge code in step S213, the process proceeds to step S216 to determine whether or not the signal is an alarm code. If the signal is an alarm code, the buzzer 26 is activated in step S217, an alarm is issued, and the process proceeds to step S202. Return. This alarm will also be described later.
[0016]
If it is determined in step S205 that the input is not from the antenna, the process proceeds to step S220, where it is determined whether the signal is due to the operation of the manual transmission switch 25. Otherwise, the process returns to step S202. If so, a lock instruction code is created in step S221. If the lock side of the manual transmission switch 25 is not operated in step S222, the process proceeds to step S223. If it is an unlock side operation, the lock instruction code is generated in step S224. Is transmitted from the transmission antenna 24 as an RF (high frequency) signal in step S225. If the lock side is operated in S222, the process proceeds to step S227, and the lock instruction code is transmitted from the transmission antenna 24 as an RF (high frequency) signal. These instruction codes are stored in the memory of the control unit 21 for the next code setting (steps S226 and S228), and the process returns to step S202.
[0017]
Note that the reading timing of the transmission / reception device 4 that receives each code of the unlock instruction and the lock instruction is performed at the same 0.68 second interval as the transmission of the electromagnetic induction signal. Therefore, in order to ensure that the code can be read at any timing, the instruction code is transmitted for 1.4 seconds, more than twice the reading interval, and the code is output twice during that time. .
[0018]
In the above-described procedure, when a response neighborhood code is transmitted from the electronic key 2 in steps S212 and S215, the transmission / reception device 4 proceeds from step S4 to step S11, and the reception module unit (hereinafter referred to as RFU) of the transmission / reception unit 42. ) Is turned on, the latest state of input / output is confirmed by the I / O read determination in step S12, the signal is read in step S13, and then the RFU is turned off in step S14. In step S15, it is determined whether or not the signal just read is a keyless signal, that is, a signal generated by operating the manual transmission switch 25.
[0019]
If it is a keyless signal, it is determined in step S16 whether or not the signal is an unlock instruction code. If so, an unlock signal is output to the door locking actuator 55b in step S17 to unlock the door. To do. If it is not an unlock instruction code, it is determined in step S18 whether or not it is a lock instruction code. If so, it is determined in step S19 whether or not the door is open based on a signal from the door sensor 54a. A lock signal is output to the actuator 55b to lock the door. When unlocking or locking is performed by these procedures, for example, the hazard lamp 56b is flashed once in step S21 when the unlocking is performed, and twice when locking is performed. Perform answerback. In step S22, when there are a plurality of electronic keys 2, priority is given to the electronic key that is currently being keylessly operated, and signals from other electronic keys are not accepted. Then, the process proceeds to step S101 in FIG. The priority process in step S22 will be described with reference to FIG.
[0020]
If it is not the lock instruction code in step S18 and if the door is open in step S19, the process proceeds to step S101 in FIG. 5 as it is. If the signal is not a keyless signal in step S15, the process proceeds to an alarm routine in step S50. This alarm routine will be described later with reference to FIG.
[0021]
Next, a location determination routine for determining whether the electronic key 2 is outside or inside the vehicle will be described with reference to FIG. This location determination is not always performed, but is performed once every five transmission timings of the electromagnetic induction signal. For this reason, the number of times the antenna signal is output is counted in step S101, and it is determined whether or not it is the timing for determining the card location in step S102. The process proceeds to S105.
[0022]
In step S105, since the previous position is usually unknown, the process proceeds from step S111 to step S112 to determine whether or not the electronic key 2 is in the passenger compartment. This determination is made based on whether the electronic key 2 has transmitted the vicinity code in step S212 in response to the search signal from the in-vehicle antenna 51 or the out-of-vehicle antenna 52. Since it is outdoor this time, it progresses to step S125, and since outdoor determination is not yet, it progresses to step S106 and performs outdoor determination. Since this time is outdoor, the previous outdoor is stored in step S108, and in preparation for the next determination, the determination flag is set to zero in steps S123 and 124, and the determination returns to step S3.
[0023]
If the determination result in the above-described step S16 is the unlock instruction code, the door is unlocked, and the user of the electronic key 2 can open the door and get on. When boarding, the procedure proceeds from step S101 to S102 and S105. Since the previous time is outdoor, steps S106 and S107 are executed. Since this time it is not outdoor, the procedure proceeds to step S109. And since indoor determination is not yet performed, step S111, S112 is performed, and since it is indoors this time, it progresses to step S114 as a previous room by step S113. The keyless entry device described here is No. 1 to No. 3 is provided with three electronic keys 2, and the challenge in step S114 means an inquiry to set a priority electronic key, and the output order of signals for each electronic key 2 is set. Is done.
[0024]
In the next step S115, no. It is determined whether or not up to 3 is completed, and if it is not completed, the procedure from step S116 to S120 is repeated. That is, the RFU is turned on in step S116, a challenge signal is transmitted in step S117, and the signal transmitted in step S118 is encrypted. When receiving the challenge signal, the electronic key 2 returns the signal encrypted in step S214 in FIG. When the RFU receives this in step S119, it is determined in step S120 whether or not the received signal is a predetermined code. If it is a predetermined code, if it matches in step S121, it will progress to step S122, the signal for STL control mentioned later will be transmitted to the control circuit 41a, step S123 and 124 will be performed, and it will return to step S3.
[0025]
Further, when the person who carries the electronic key 2 goes out of the passenger compartment from this state, the process proceeds from step S101 to S102 and S105. Since the previous time was indoors, steps S111 and S112 are executed. Since the outdoor determination has not been made, the process proceeds to step S106 to perform outdoor determination. And since it is outdoor this time, it memorize | stores the last outdoor in step S108, and returns to step S3 through steps S123 and 124.
[0026]
Further, if the person who carries the electronic key 2 has moved away from the vehicle, the process proceeds from step S101 to S107. However, since communication with the electronic key 2 cannot be performed, it is determined that the user is not outdoors and the process proceeds to step S109. Then, since the room determination is not yet made, the process proceeds to step S111. However, since communication is not possible, it is determined that the room is not indoor, and the process proceeds to step S125. And since outdoor determination has been completed, it progresses to step S126, makes it unknown last time, returns to step S3 through steps S123 and 124. In addition, also when indoor determination has been completed in step S109, the previous time is unknown in step S110, and the process returns to step S3 via steps S123 and 124.
[0027]
In this device, in addition to the locking / unlocking operation by the manual transmission switch 25 described in the procedure from step S15 onward, a general keyless entry device that automatically locks / unlocks the door according to the location of the electronic key 2 is used. In this case, it is necessary to operate a will confirmation sensor 54b provided in the vehicle side device 3, and the ignition switch 57 is also controlled by the electronic key 2 by the function of the immobilizer. It is like that. For example, a switch provided on the outer handle of the door is used as the intention confirmation sensor 54b. Note that the above-described operation of automatically locking and unlocking the door according to the location of the electronic key 2 is a general operation and is not included in the flowchart of FIG.
[0028]
Next, an operation when the will confirmation sensor 54b is operated will be described. In the hold state of step S3 shown in FIG. 3, when the carrier of the electronic key 2 touches the will confirmation sensor 54b in an attempt to open the door, this is detected, the process proceeds from step S4 to step S5, and further proceeds to step S10. The count is stopped and cleared, and the process proceeds to step S31 in FIG. 4, the processing order for the plurality of electronic keys 2 is determined, the process proceeds to step S32, and the processing from step S33 onward is performed according to the determination order. The timer in step S10 is a timer that starts counting in step S52 in FIG. 9, and FIG. 9 will be described later.
[0029]
The procedure from step S33 to S38 is the same as that from step S115 to S120 described in FIG. 5, and the same procedure is repeated for the three electronic keys 2. In this case, since the signal sent to the electronic key 2 is not a proximity search signal but a challenge code, an encrypted code is transmitted from the electronic key 2, and if it is not a predetermined code, the process returns to step S33 to return to the next challenge. If the code is transmitted, and if it is a predetermined code, the result of collation in step S39 matches, the process proceeds to step S40, and a mode in which reading of the signal from the electronic key 2 with the lower priority is rejected is set. The higher priority of the electronic key is, for example, the one that is in communication when the intention confirmation sensor 54b is operated as described above, for example, the one that the manual transmission switch 25 is operated, or the one that is frequently used. Those that are outside the vehicle, those that are currently in communication, those that were last communicated, etc., which can be selected or set in advance.
[0030]
In step S41, an unlock instruction code is set, and the process proceeds to step S42. Since the door is currently locked, the lock sensor 54c detects the locked state, and the process proceeds from step S42 to step S46. Since the door is closed, the door sensor 54a detects that the door is closed. In step S47, the door sensor 54a outputs an unlock signal to the door lock actuator 55b to unlock the door. In step S48, for example, the hazard lamp 56b is activated twice. The fact that the door is unlocked is notified by the blinking answer answer, and the process returns to step S3. The user of the electronic key 2 can now get into the car.
[0031]
When the user gets in and enters the vehicle interior, the process proceeds from step S101 to steps S102 and S105. Since the previous time is outdoor, steps S106 and S107 are executed. In step S107, the current time is not outdoor, and the process proceeds to step S109. Since the room has not been determined, steps S111 and S112 are executed. Since this time the room is indoors, the process proceeds from step S113 to steps S114 and S115. Steps S115 to S120 are executed, and if the collation is OK in step S121, the process proceeds to step S122, and a signal for STL control is transmitted to the control circuit 41a to start the operation. Although not shown in the figure, the control circuit 41a stops its operation and ends when the operation knob 57a is not pushed in and the STL control signal is not transmitted for 10 seconds or longer. It is supposed to be.
[0032]
When the control circuit 41a starts operation, the control circuit 41a is initialized in step S301, the output is turned off in step S302, and then the process proceeds to step S303. In this state, since the ignition switch 57 is off and ACC is also off, steps S303 to S304 and S305 in FIG. 7 are executed, and the process proceeds to step S306. The ignition switch 57 of the illustrated apparatus has a structure that is started by pushing and rotating the operation knob 57a. In step S306, it is detected that the operation knob 57a is in the depressed position. The state of the switch to be confirmed is confirmed, and since it is not pushed in here, the process proceeds to step S341.
[0033]
Since the signal for STL control has been transmitted from the control unit 41 this time, the control unit 41 is in a rising state, proceeds to step S342 to perform code processing, and in step S343, transmits the code to the control unit 41. Send. In step S344, a code processing completion flag is set. When the code processing result is transmitted, steps S3 to S6 in FIG. 3 are executed. In step S6, it is determined that there has been a communication terminal interrupt, and the process proceeds to step S7. Is supposed to be stored.
[0034]
Next, the operation knob 57a is pushed in to start the engine. This time, the process proceeds from step S306 to step S307 in FIG. 8, where it is confirmed whether or not the transmission of the encrypted code or the processed code for authentication communication is completed, but steps S342 to S344 have already been executed and processed. Since the code is transmitted and the transmission completion flag is set in step S344, it is determined that the code transmission is completed, and the process proceeds to step S313, where collation is performed. If it is a regular signal, steps S314 to S315 to S319 are executed. In step S314, a drive output to the operation knob solenoid 55a is output, and for example, an indicator lamp 56c provided at the tip of the operation knob 57a is turned on to indicate that the push-in operation is possible. In step S315, the code determined to be a legitimate code in step S313 is transmitted to the control unit 41, and a transmission completion flag is set in step S316.
[0035]
In step S317, it is determined whether or not the predetermined time has been completed. The process returns to step S303 until the predetermined time elapses, and when the predetermined time elapses, the output to the operation knob solenoid 55a indicates that the predetermined time has elapsed in step S318. In step S319, the output to the operation knob solenoid 55a is stopped and the solenoid 55a is turned off. As a result, the STL is unlocked, and a drive output to the operation knob solenoid 55a is output for a preset time, so that the operation knob 57a can be pushed further inward and rotated from the ACC position to the ON position. It becomes possible to start the engine.
[0036]
When the position is turned to the ON position, the process proceeds from step S303 to step S321, the transmission completion flag is cleared, and steps S322 to S324 are executed. In step S322, even if the preset time has not elapsed, the output to the operation knob solenoid 55a is stopped and the solenoid 55a is turned off. In step S323, the output to the solenoid 55a indicates that a predetermined time has elapsed. A flag is set. In step S324, the alarm turned on in step S339, which will be described later, is turned off and the process proceeds to step S325, where it is determined whether or not the codes match, and if they match, energization of the engine is permitted in step S326. The engine starts. If the codes do not match, the process directly returns to step S303 so that the engine cannot be started even if the operation knob 57a is turned to the ON position.
[0037]
When the operation knob 57a is returned to stop the engine and ACC is also turned off, steps S303 to S306 are executed, and the process proceeds to step S341. If it is time for the control unit 41 to rise, the process proceeds to step S342, and if it is not time for the control unit 41 to rise, the process proceeds to step S317 in FIG. 8 via step S345. Since the predetermined drive time of the solenoid has been completed, steps S318 and S319 are executed, and the process returns to step S303. If it is determined that the code processing transmission has not been completed, the process proceeds from step S345 to S346, where it is determined that noise has occurred.
[0038]
Further, when the engine is stopped and the door is opened with the ignition switch in the ACC position and an attempt is made to get off, the process proceeds from step S304 to step S331 to clear the transmission completion flag, and the operation knob solenoid 55a is turned on / off in step S332. Is judged. That is, it is determined whether or not the output to the operation knob solenoid 55a has passed for a predetermined time. This time, since the flag for completion of the predetermined time is set in step S323, the process proceeds to step S335. When the operation knob is operated during the output to the solenoid 55a before the engine is started and the ACC state is set, the process proceeds from step S332 to S333, and the output is stopped even if the preset time has not elapsed. 55a is turned off, and a flag indicating that a predetermined time has elapsed is set in step S334. In step S335, the fall of the ignition switch is determined. However, since the engine is stopped and the engine is switched to AAC, the ignition switch is in the fall state, and the process proceeds to step S336. If the door is opened, the process proceeds to step S338.
[0039]
In step S339, the alarm is turned on for a predetermined time, and an alarm sound is generated by the buzzer 56a, for example. When the predetermined time is completed, the alarm proceeds from step S338 to S337 and is turned off. If the ignition switch 57 leaves the vehicle with the ignition switch 57 in the ACC position and leaves the vehicle, the STL control signal is not transmitted. If this state continues for 10 seconds or more, the control circuit 41a stops operating. Therefore, even if another person gets in this state and turns the ignition switch from the ACC position to the ON position, the engine cannot be started. Even if the operation knob 57a is depressed to start the operation of the control circuit 41a, the engine cannot be started because the codes do not match in step S325.
[0040]
The process proceeds directly from step S307 in FIG. 8 to step S313 when the battery 27 of the electronic key 2 is in operation. When the battery 27 is exhausted, the control unit 41 of the electronic key 2 does not operate at all. . For this reason, the user of the electronic key 2 needs to use the manual key to open the door and get into the car. In this case, the electronic key 2 is placed near the ignition switch 57 after the ride and the operation knob 57a is pushed in. The transponder 28 of the electronic key 2 operates with the energy received from the electromagnetic induction signal transmitted from the antenna 41b. To start. That is, when the operation knob 57a is pushed, the operation of the control circuit 41a is started, and steps S301 to S306 are executed and the process proceeds from step S306 to S307. However, since transmission of the code signal is not completed here, step S308 is completed. Proceed to
[0041]
Since the key cylinder is operated by the key operation this time, the procedure further proceeds to step S309 and the following steps. In steps S310 and S311, a predetermined code is output to the electronic key 2, and the transponder 28 of the electronic key 2 A code is returned, and this is received by the antenna 41b in step S312. If the signal is a normal signal in step S313, the process proceeds to step S314, where the STL is unlocked and the engine can be started as described above. In this way, even if the battery 27 of the electronic key 2 is depleted, the door can be unlocked and the vehicle can enter the vehicle to perform a desired operation. In this case, the manual key and the electronic key are required at the same time. Therefore, it is convenient for the user if the electronic key has a shape in which the manual key is integrally formed.
[0042]
The illustrated device has both the door locking / unlocking and STL control functions, and the identification signal for locking / unlocking encrypts the challenge code output from the vehicle antenna 52 when the intention confirmation sensor 54b is operated. The identification signal for STL control is obtained by encrypting the challenge code output from the in-vehicle antenna 51 when the electronic key 2 is determined indoors. Since this challenge code is changed for each output and a different signal is issued, encryption is necessary each time, and this change is performed according to a standard set in advance in both the electronic key 2 and the transmission / reception device 4 on the vehicle side. . When there are a plurality of electronic keys 2, a different challenge code is output for each electronic key. Therefore, since the specific electronic key responds to the specific code with respect to the specific challenge code, the transmission / reception device 4 can recognize which electronic key 2 is communicating.
[0043]
As described above, when the electronic key 2 approaches the vehicle, the transmission / reception device 4 and the electronic key 2 are always in communication with each other, and the door is in an unlocked state. This is not preferable because it causes 27 unnecessary consumption and theft of the vehicle. The illustrated apparatus 1 has a safety function in the case where the door sensor 54a does not detect the opening of the door until a predetermined time elapses after the transmission / reception apparatus 4 receives the door locking / unlocking identification signal.
[0044]
That is, if the signal is not a keyless signal in step S15 in FIG. 3, the process proceeds to an alarm routine in step S50 shown in FIG. In this case, since it is outdoor in the previous time, the process proceeds from step S51 to S52, and the count is started. When the preset count number is reached, the process proceeds from step S53 to S54, and the count is stopped and returned to zero. In step S55, an alarm is issued. The alarm is transmitted by, for example, sounding a horn or blinking the hazard lamp 56b. In step S56, an alarm code is transmitted to the electronic key 2, and the buzzer 26 of the electronic key 2 is activated to carry the alarm. The person is notified directly (steps S216 and S217 in FIG. 6).
[0045]
In step S58, a lock signal is output to the door lock actuator 55b, and the door is locked. As described above, if the door does not open even after the time corresponding to the preset count number has elapsed, an alarm is issued and an automatic door lock is performed, so that the above-described problem does not occur. After the door is locked, if an operation to open the door using a manual key is detected in step S59, or if unlocking is performed by a keyless signal by operating the manual transmission switch 25 in step S60, the process proceeds to step S61. Is unlocked.
[0046]
Further, if it was not outdoor in the previous step in step S51 and until the set count is reached in step S53, the process proceeds to step S70. If the door is open here, the process proceeds to step S71, where the output of the electromagnetic induction signal is advanced at intervals of 0.2 seconds, and the count is stopped and returned to zero in step S73. As described above, when the door is opened, when the door is opened, the location of the electronic key 2 changes depending on getting on and off, that is, whether it is outside the vehicle or inside the vehicle. This is because the location is accurately detected and the control is properly performed. If the door is not opened in step S70, the process proceeds to step S72, and normal output at intervals of 0.68 seconds is continued.
[0047]
【The invention's effect】
  As is clear from the above description, the keyless entry device of the present invention isIn the keyless entry device that activates the in-vehicle device mounted on the vehicle according to the communication result with the electronic key,Sends an electromagnetic induction signal to activate the electronic key to the passenger compartmentThe in-vehicle antenna and the in-vehicle antenna that transmits the electromagnetic induction signal to the outside of the passenger compartment, and the transmitted electromagnetic induction signalA transmission / reception device that receives an identification signal transmitted from an electronic key in response to the output and outputs an operation signal according to the identification signal, and a drive device that drives an in-vehicle device according to the output operation signalWhen,Door sensor that detects opening and closing of doorsIf there is a response of the identification signal when the electromagnetic induction signal is transmitted from the vehicle antenna, the location of the electronic key is determined to be indoors, and the response of the identification signal is transmitted when the electromagnetic induction signal is transmitted from the vehicle antenna. If there is, the location of the electronic key is determined to be outside the room,When door opening is detectedWhile the door is openThe transmission cycle of the electromagnetic induction signal transmitted intermittently is shortened.
[0048]
Accordingly, the location of the electronic key changes from the inside of the vehicle to the outside of the vehicle as the elevator moves up and down, and vice versa, and the transmission period of the electromagnetic induction signal is shortened when the door is opened, which often changes the state of the vehicle. Communication between the transmission / reception device and the electronic key can be performed more densely than usual. For this reason, it is possible to accurately detect the location of the electronic key and perform control without malfunction, and the responsiveness is also improved.
[0049]
  In the above apparatus,For carIf the antenna is placed in the center pillar between the front door and the rear door of the vehicle and located near the center when viewed from the side, and the in-vehicle antenna is placed in the center console located in the center of the passenger compartment, It is possible to avoid duplication of communication areas, to prevent malfunction due to interference, and to secure a communication area with good transmission / reception characteristics.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the overall configuration of a vehicle keyless entry device according to the present invention.
FIG. 2 is a block diagram showing a configuration of an electronic key of the apparatus.
FIG. 3 is a flowchart showing a basic operation of a vehicle side device of the above device.
FIG. 4 is a flowchart showing a basic operation of the vehicle side device.
FIG. 5 is a flowchart showing the basic operation of the vehicle side device.
FIG. 6 is a flowchart showing the basic operation of the electronic key of the apparatus.
FIG. 7 is a flowchart regarding control of a steering lock device in the above-described device.
FIG. 8 is a flowchart regarding control of the steering lock device.
FIG. 9 is a flowchart of an alarm routine in the apparatus same as above.
[Explanation of symbols]
1 Keyless entry device
2 Electronic key
3 Vehicle side device
4 Transceiver
21 Electronic key side controller
22 Electronic key side transceiver
41 Vehicle-side control unit
42 Vehicle side transceiver
51 Car interior antenna
52 Antenna for car exterior
54a Door sensor

Claims (3)

In the keyless entry device that activates the in-vehicle device mounted on the vehicle according to the communication result with the electronic key,
The vehicle has an in- vehicle antenna that transmits an electromagnetic induction signal for activating the electronic key to the vehicle interior, and an external antenna for transmitting the electromagnetic induction signal to the outside of the vehicle interior, and electronically responds to the transmitted electromagnetic induction signal. a transmitting and receiving apparatus outputs an operation signal corresponding to the identification signal and receiving the identification signal transmitted from the key, a driving device for driving the vehicle equipment depending on the output operation signal, a door sensor for detecting the opening and closing of the door If the electromagnetic induction signal is transmitted from the in-vehicle antenna and there is a response of the identification signal, the location of the electronic key is determined to be indoors, and the response of the identification signal is transmitted when the electromagnetic induction signal is transmitted from the external antenna. with the location of the electronic key determines the outdoor if open when is detected opened amid configured to shorten the transmission period of the electromagnetic induction signals are transmitted intermittently door door And keyless entry system, characterized by that. The control unit provided in the transmission / reception device stores the location of the electronic key determined last time, that is, whether it is outdoor or indoor, and is an antenna for vehicle interior or antenna for vehicle exterior on the same side as the location of the electronic key determined last time The electromagnetic induction signal is transmitted from the electronic key, and if there is a response of the identification signal from the electronic key, it is determined that the electronic key is in the same position as the previous time, and the electromagnetic induction signal is not transmitted from the other antenna. The keyless entry device for vehicles according to claim 1. The keyless entry device for vehicles according to claim 1 or 2 , wherein the antenna for vehicle exterior is disposed at a center pillar between a front door and a rear door of the vehicle, and the antenna for vehicle interior is disposed at a center console.

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