CN102708605B - Electron key system - Google Patents
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- CN102708605B CN102708605B CN201210021141.2A CN201210021141A CN102708605B CN 102708605 B CN102708605 B CN 102708605B CN 201210021141 A CN201210021141 A CN 201210021141A CN 102708605 B CN102708605 B CN 102708605B
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Abstract
A kind of electron key system, can correctly judge and whether be the use of the improper communication of repeater.From two mensuration signals (Srs1, Srs2) that car-mounted device (20) strength of transmitted signals is different.When the difference of the RSSI of these two mensuration signals is below threshold value, be judged as YES the improper communication employing repeater.These two mensuration signals (Srs1, Srs2) send in the given time.The schedule time is configured to, when have sent identical two mensuration signal (Srs1, the Srs2) of signal intensity from repeater, the difference of the RSSI of two the mensuration signals (Srs1, Srs2) produced with the movement of electron key (10) is below threshold value.Thus, even if when electron key (10) moves, still can correctly judge and be the use of the improper communication of repeater.
Description
Technical field
The present invention relates to electron key system.
Background technology
In electron key system in the past, by carrying out radio communication between electron key and vehicle, permission car door is locked, door unlock
engine start etc.Such as, vehicle possesses car internal antenna and car outside antenna, and car internal antenna sends to communication zone in car and requires signal, and car outside antenna sends to communication zone outside the car of vehicle-surroundings and requires signal.When the electron key entering into certain communication zone receive require signal time, send to vehicle and comprise the answer signal of ID code.Be arranged in the outer communication zone of car when electron key and the verification of the ID code comprised from the answer signal of electron key is set up time, vehicle allows to be locked by car door or unlock.On the other hand, be arranged in car communication zone when electron key and the verification of the ID code comprised from the answer signal of electron key is set up time, vehicle allows engine start.
In recent years, occurred that employing relaying electric wave (requires signal
answer signal) repeater, the electron key not inside and outside car in communication zone is disguised oneself as the improper communication being positioned at the outer communication zone of car communication zone or car.By using this repeater to carry out improper communication, likely perform door unlock or engine start wrongly.So such as, disclosed in patent documentation 1, the improper communication studied for employing repeater adopts guard measure.
Patent documentation 1: Japanese Unexamined Patent Publication 2006-118886 publication
The applicant have studied and prevents from using repeater to carry out improper communication by changing the signal intensity of the wireless signal of transmission and reception between vehicle and electron key.Such as, vehicle multiple wireless signals that strength of transmitted signals is different successively.Electron key detects the respective signal intensity of the multiple wireless signals sent from vehicle.At this, repeater can not imitate the signal intensity of wireless signal.That is, even if multiple wireless signals that repeater is different from vehicle receiver to signal intensity, also all to the wireless signal that electron key strength of transmitted signals is identical.Therefore, when there is repeater between vehicle and electron key, the wireless signal that electron key received signal strength is identical.Now, electron key can judge that carried out communication is the use of the improper communication of repeater, thus does not allow door unlock.
But in said structure, if electron key from play after receiving wireless signal receive next wireless signal before during move, although then there is repeater, the signal intensity of each wireless signal also likely making electron key receive becomes difference.Thus, although use repeater, be also likely judged as the improper communication not being the use of repeater.
Summary of the invention
The present invention proposes in view of the foregoing, its object is to, and provides a kind of electron key system of the improper communication whether being the use of repeater that can correctly judge.
The following describes the means for realizing above-mentioned purpose and action effect thereof.
Electron key system involved by 1st aspect of the present invention, the control of described control object is performed by transmission and reception wireless signal between control object and electron key, described control object is in the given time to multiple wireless signals that described electron key strength of transmitted signals is different, described electron key system comprises: test section, be arranged on described electron key, detect send from described control object each described in the signal intensity of wireless signal, and judging part, be arranged on described control object or described electron key, when recognized by described test section each described in the difference of signal intensity of wireless signal exceed the threshold value of difference setting of the signal intensity of each wireless signal according to described transmission time, judging part is judged as the improper communication not being the use of repeater, allow the control performing described control object, and recognized by described test section each described in the difference of signal intensity of wireless signal below described threshold value time, judging part is judged as YES the improper communication employing repeater, forbid the control performing described control object, the described schedule time is configured to, when being made by repeater that described in each, signal intensity of wireless signal becomes identical, the difference of the signal intensity of each wireless signal from described repeater produced with the movement of described electron key within the described schedule time is below threshold value.
According to this structure, multiple wireless signals that strength of transmitted signals is different.When the difference of the signal intensity of these signals is below threshold value, be judged as YES the improper communication employing repeater.This is because repeater does not imitate the signal intensity of wireless signal, so when employing repeater, be approximately zero from the difference of the signal intensity of each wireless signal of repeater transmission.But when employing repeater, the electron key carried due to user moves, it is poor that the signal intensity resulting through each wireless signal that test section detects produces.For this point, in said structure, send each wireless signal in the given time.The schedule time is set shorter, electron key can the distance of movement in the given time less, so the difference of the signal intensity of each wireless signal produced with the movement of electron key is less.From such a viewpoint, the schedule time is configured to, and when have sent the identical multiple wireless signal of signal intensity from repeater, the difference of the signal intensity of each wireless signal produced with the movement of electron key is below threshold value.Thus, even if when electron key moves, also can correctly judge and be the use of the improper communication of repeater.
Invention described in 2nd aspect of the present invention, in electron key system described in the 1st, the described schedule time is that the difference by the signal corresponding with the signal intensity of wireless signal described in each being arrived distance calculates divided by the maximum translational speed of the user set.
According to this structure, the signal that electron key can be prevented to be moved beyond each wireless signal in the given time arrives the distance of the difference of distance.Thus, when have sent the identical multiple wireless signal of signal intensity from repeater, the difference of the signal intensity of each wireless signal produced because of the movement of electron key can be suppressed to exceed threshold value, the improper communication being judged as not being the use of repeater mistakenly can be suppressed further.
Invention described in 3rd aspect of the present invention, in electron key system in the 1st or described in the 2nd, described electron key by recognized by described test section each described in the signal intensity of mensuration signal be included in signal strength information signal and send, described judging part is arranged in described control object, according to the signal intensity being included in described signal strength information signal described in each mensuration signal, judge whether the improper communication being the use of repeater.
According to this formation, the testing result of test section is comprised in signal strength information signal and is sent to control object.Thereby, it is possible to judge whether by the judging part in control object the improper communication being the use of repeater.Like this, by being arranged in control object by judging part, the further miniaturization of the electron key of higher portability can will be required compared to control object.
Invention described in 4th aspect of the present invention, in electron key system described in the 3rd, described signal strength information signal is the response signal also comprising the intrinsic ID code of described electron key except the testing result of described test section, described control object is when receiving described response signal, carry out the verification between the ID code that comprises in described response signal and the ID code self prestored, when the verification of described ID code is set up, described judging part judges whether according to the testing result of the described test section comprised in described response signal the improper communication being the use of repeater.
According to this structure, when the verification of ID code is set up, judge whether the improper communication being the use of repeater.Number of times is judged thereby, it is possible to reduce.
Electron key system involved by 5th aspect of the present invention, the control of described control object is performed by transmission and reception wireless signal between control object and electron key, described electron key is in the given time to multiple wireless signals that described control object strength of transmitted signals is different, described electron key system comprises: test section, be arranged in described control object, detect send from described electron key each described in the signal intensity of wireless signal, and judging part, be arranged on described control object or described electron key, when recognized by described test section each described in the difference of signal intensity of wireless signal exceed the threshold value of difference setting of the signal intensity of each wireless signal according to described transmission time, judging part is judged as the improper communication not being the use of repeater, allow the control performing described control object, and recognized by described test section each described in the difference of signal intensity of wireless signal below described threshold value time, judging part is judged as YES the improper communication employing repeater, forbid the control performing described control object, the described schedule time is configured to, when being made by repeater that described in each, signal intensity of wireless signal becomes identical, the difference of the signal intensity of each wireless signal from described repeater produced with the movement of described electron key within the described schedule time is below threshold value.
According to this formation, the effect identical with the 1st aspect also can be obtained.
Invention described in 6th aspect of the present invention, in electron key system described in the 5th, the described schedule time is that the difference by the signal corresponding with the signal intensity of wireless signal described in each being arrived distance calculates divided by the maximum translational speed of the user set.
According to this formation, the effect identical with the 2nd aspect also can be obtained.
Invention effect
According to the present invention, in electron key system, more can correctly judge and whether be the use of the improper communication of repeater.
Accompanying drawing explanation
Fig. 1 is the structural drawing of electron key system.
Fig. 2 illustrates the received signal strength of various signal and sends the time diagram of timing.
Fig. 3 shows the vertical view of the vehicle of the sending zone of mensuration signal etc.
Fig. 4 is the partial enlarged drawing of Fig. 3.
Fig. 5 is the process flow diagram of the treatment step that electron key control part 11 and vehicle-mounted control portion 21 are shown.
Description of reference numerals
1 ... electron key system, 10 ... electron key, 20 ... car-mounted device (control object), 21 ... vehicle-mounted control portion (judging part), 16 ... RSSI testing circuit (test section).
Embodiment
Below, with reference to Fig. 1 ~ Fig. 5, electron key system involved in the present invention is described.
As shown in Figure 1, electron key system 1 possesses the electron key 10 and car-mounted device 20 held by user.Intercom mutually between electron key 10 with car-mounted device 20, set up as condition at the outer communication zone of car with the intercommunication of this phase, allow car door lock or unlock, set up as condition with this phase intercommunication communication zone in car, allow engine start.
< electron key >
Electron key 10 possesses electron key control part 11, LF acceptance division 12 and UHF sending part 13.LF acceptance division 12 is provided with receiving antenna 12a, UHF sending part 13 is provided with transmitting antenna 13a.
Electron key control part 11 is made up of computer unit, has non-volatile storer 11a.The ID code that electron key 10 is intrinsic is stored in this storer 11a.
As shown in Figure 2, LF acceptance division 12 possesses receiving antenna 12a, is received the wake-up signal Swk and the 1st mensuration signal Srs1 and wake-up signal Swk and the 2nd mensuration signal Srs2 that send from car-mounted device 20 by this receiving antenna 12a continuously.And LF acceptance division 12 outputs to electron key control part 11 after these signal receiving are become pulse signal.Wake-up signal Swk and two mensuration signal Srs1, Srs2 be LF (LowFrequency, low frequency) with wireless signal.
Further, as shown in Figure 1, LF acceptance division 12 is provided with RSSI testing circuit 16.RSSI testing circuit 16 detects the received signal strength (ReceiveSignalStrengthIndication, below sometimes referred to as RSSI) of two mensuration with signal Srs1, Srs2, testing result is outputted to electron key control part 11.
Electron key control part 11 when recognizing wake-up signal Swk, the RSSI of each mensuration signal Srs1, Srs2 of inputting after being identified in wake-up signal Swk by RSSI testing circuit 16.And electron key control part 11, when recognizing the 2nd wake-up signal Swk and the 2nd mensuration signal Srs2, generates answer signal (acksignal) Sac, this answer signal Sac is exported to UHF sending part 13.UHF sending part 13 couples of answer signal Sac modulate, by transmitting antenna 13a, using modulation after answer signal Sac as UHF (UltraHighFrequency, ultrahigh frequency) with wireless signal send to car-mounted device 20.
As shown in Figure 2, for this answer signal Sac, challenge signal Scc is sent from car-mounted device 20 to electron key 10.
When LF acceptance division 12 receives challenge signal Scc by receiving antenna 12a, this challenge signal Scc is demodulated into pulse signal, by the output of pulse signal after demodulation to electron key control part 11.Electron key control part 11, when receiving the challenge signal Scc from LF acceptance division 12, identifies the inquiry code contained in challenge signal Scc.Then, electron key control part 11 is encrypted this inquiry code, generates response code.
Electron key control part 11 generates above-mentioned response code and the response signal Sre that is included as the RSSI of two mensuration signals Srs1, Srs2 of RSSI information, and this response signal Sre is outputted to UHF sending part 13 by electron key control part 11.UHF sending part 13 couples of response signal Sre modulate, and the response signal Sre after this modulation is sent to car-mounted device 20 by transmitting antenna 13a as the wireless signal that UHF is with.
< car-mounted device >
As shown in Figure 1, car-mounted device 20 possesses sending part 23 and vehicle-mounted acceptance division 24 in vehicle-mounted control portion 21, the outer sending part 22 of car, car.The outer sending part 22 of car is provided with transmitting antenna 22a, in car, sending part 23 is provided with transmitting antenna 23a, vehicle-mounted acceptance division 24 is provided with receiving antenna 24a.
In addition, vehicle-mounted control portion 21 is electrically connected with lock-up cock 36, tail-off 33, vehicle door locking device 34 and engine device 35.
As shown in amplify in the circle of Fig. 3, the outer sending part 22 of car is arranged on the inside of the outside door handle 4 of car door.In addition, lock-up cock 36 is arranged in outside door handle 4, and when user has carried out pressing operation to lock-up cock 36, expression is outputted to vehicle-mounted control portion 21 by the operation signal operated by lock-up cock 36.
Vehicle-mounted acceptance division 24 is arranged on the substantial middle of car indoor.In addition, in car, sending part 23 is provided with 2 along the above-below direction of Fig. 3 in car indoor.In addition, tail-off 33 is arranged near driver's seat, and when user has carried out pressing operation to tail-off 33, expression is outputted to vehicle-mounted control portion 21 by the operation signal operated by tail-off 33.In addition, vehicle door locking device 34 is the devices automatically locked by car door under the state of closing of the door or unlock.
Vehicle-mounted control portion 21 is made up of computer unit, has non-volatile storer 21a.The ID code identical with the ID code stored in the storage part 11a of electron key 10 is stored in this storer 21a.
When vehicle-mounted control portion 21 recognize lock-up cock 36 carried out operation time, generate wake-up signal Swk and the 1st successively and measure to measure with signal Srs1 and wake-up signal Swk and the 2nd and use signal Srs2, these signals are outputted to sending part 22 outside car.
When the outer sending part 22 of car receives wake-up signal Swk and the 1st mensuration signal Srs1 and wake-up signal Swk and the 2nd mensuration signal Srs2 of the input continuously from vehicle-mounted control portion 21, successively these signals are modulated.Then, the wireless signal that the signal after these modulation is with as LF by transmitting antenna 22a sends by the outer sending part 22 of car.
As shown in Figure 2, the signal intensity of the 1st mensuration signal Srs1 is configured to larger than the signal intensity of the 2nd mensuration signal Srs2.Therefore, the 1st mensuration is different with the sending zone of the 2nd mensuration signal Srs2 with signal Srs1.In detail, as shown in Figure 3, the 1st mensuration signal Srs1 is sent to the 1st sending zone 31 being formed as semicircle shape at each door outside.1st sending zone 31 is formed centered by outside door handle 4, with radius R 1.In addition, the 2nd mensuration signal Srs2 is sent to the 2nd sending zone 32 being formed as semicircle shape with the radius R 2 less than radius R 1.That is, the 2nd sending zone 32 is formed as being included in the 1st sending zone 31.In the present embodiment, radius R 2 is set to 40cm with the difference of radius R 1.In other words, the signal intensity of two mensuration signals Srs1, Srs2 is configured to make radius R 2 be 40cm with the difference of radius R 1.
In addition, as shown in Figure 2, two mensuration signals Srs1, Srs2 respectively during schedule time T1 in be sent out.In the present embodiment, T1 is set to 300ms the schedule time.Computing method for this schedule time T1 will be described in detail later.
As shown in Figure 2, electron key 10, when receiving the 2nd wake-up signal Swk and the 2nd mensuration signal Srs2, beams back answer signal Sac to car-mounted device 20.
The vehicle-mounted acceptance division 24 of car-mounted device 20 receives answer signal Sac by receiving antenna 24a.Then, answer signal Sac is demodulated into pulse signal by vehicle-mounted acceptance division 24, by the output of pulse signal after demodulation to vehicle-mounted control portion 21.
Vehicle-mounted control portion 21, when recognizing answer signal Sac, generates the challenge signal Scc comprising and address inquires to code, challenge signal Scc is outputted to the outer sending part 22 of car.Now, vehicle-mounted control portion 21 generates response code by being encrypted inquiry code.Electron key 10 and car-mounted device 20 adopt same key in encryption.The outer sending part 22 of car, when receiving the challenge signal Scc from vehicle-mounted control portion 21, is modulated challenge signal Scc, is sent by the signal after this modulation by transmitting antenna 22a.
As shown in Figure 2, for challenge signal Scc, beam back response signal Sre from electron key 10 to car-mounted device 20.
The vehicle-mounted acceptance division 24 of car-mounted device 20 is by the response signal Sre of receiving antenna 24a reception from electron key 10.Then, response signal Sre is demodulated into pulse signal by vehicle-mounted acceptance division 24, by the output of pulse signal after demodulation to vehicle-mounted control portion 21.
The ID code comprised in 21 pairs, vehicle-mounted control portion response signal Sre, response code, to identify as the RSSI of two mensuration signals Srs1, Srs2 of RSSI information.Vehicle-mounted control portion 21 carries out the verification (response check) between the response code that self generates and the response code being included in response signal Sre.In addition, vehicle-mounted control portion 21 carries out the verification (ID code check) between the ID code that is included in response signal Sre and the ID code be stored in storer 21a.Vehicle-mounted control portion 21, when being judged as response check and ID code check sets up, judges whether the improper communication being the use of repeater.
In detail, vehicle-mounted control portion 21, when the difference of the RSSI of the 1st mensuration signal Srs1 identified according to RSSI information and the RSSI of the 2nd mensuration signal Srs2 exceedes threshold value, is judged as that the communication between electron key 10 is not the use of the improper communication of repeater.In addition, vehicle-mounted control portion 21, when the difference of the RSSI of the 1st mensuration signal Srs1 identified and the RSSI of the 2nd mensuration signal Srs2 is below threshold value, is judged as that the communication between electron key 10 is the use of the improper communication of repeater.This threshold value sets according to the difference of the RSSI of two mensuration signals Srs1, Srs2 sending from car-mounted device 20.
Vehicle-mounted control portion 21, when judging the improper communication not being the use of repeater, switches locking state or the released state of car door by vehicle door locking device 34.On the other hand, vehicle-mounted control portion 21, when being judged as YES the improper communication employing repeater, does not make vehicle door locking device 34 carry out the locking state of car door or the switching of released state.
In addition, identical when having been carried out operation with above-mentioned lock-up cock 36, wake-up signal Swk and the 1st mensuration signal Srs1 and wake-up signal Swk and the 2nd mensuration signal Srs2, when recognizing tail-off 33 and having been carried out operation, is sent to car indoor by the transmitting antenna 23a of sending part in car 23 by vehicle-mounted control portion 21 continuously.The signal intensity of these signals and send timing and signal intensity when sending part 22 sends signal above by car and send timing identical outward.Vehicle-mounted control portion 21, when being judged as response check and ID code check sets up, judges whether the improper communication being the use of repeater.Then, when vehicle-mounted control portion 21 is judged as the improper communication not being the use of repeater, by engine device 35 starting engine.On the other hand, vehicle-mounted control portion 21, when being judged as YES the improper communication employing repeater, does not make engine start.
Then, with reference to Fig. 4, the process action of the improper communication that employs repeater and the car-mounted device 20 when carrying out improper communication and electron key 10 is described.
As shown in Figure 4, repeater 101 possesses transmission and reception unit 101a, cable 101b and transmission and reception unit 101c, receives wake-up signal Swk, two mensuration signal Srs1, Srs2 and challenge signal Scc by transmission and reception unit 101a transmission and reception unit 101a.The wake-up signal Swk etc. received by transmission and reception unit 101a is sent from being positioned at the transmission and reception unit 101c left the position of vehicle via cable 101b by repeater 101.Thus, wake-up signal Swk etc. are relayed to by repeater 101 electron key 10 that communication zone inside and outside the car of vehicle leaves.Now, repeater 101 does not imitate the signal intensity of various signal.That is, even if repeater 101 receives RSSI different two mensuration signals Srs1, Srs2 by transmission and reception unit 101a, still two mensuration signals Srs1, Srs2 are sent by transmission and reception unit 101c with identical signal intensity.
Now, electron key control part 11 is identified by the RSSI of RSSI testing circuit 16 to two mensuration signals Srs1, Srs2 from transmission and reception unit 101c.Now, as mentioned above, the signal intensity of two mensuration signals Srs1, Srs2 is identical.Therefore, electron key control part 11, when the difference of the RSSI of the RSSI and the 2nd mensuration signal Srs2 that identify the 1st mensuration signal Srs1 is below threshold value, is judged as YES the improper communication employing repeater.
At this, such as, the electron key 10 that user holds moves, and the distance between transmission and reception unit 101c and electron key 10 changes.The RSSI of the wireless signal from transmission and reception unit 101c that electron key 10 receives and the distance between transmission and reception unit 101c and electron key 10 are inversely proportional to.
Therefore, from play after receiving the 1st mensuration signal Srs1 receive the 2nd mensuration signal Srs2 before during, when making the distance between electron key 10 and transmission and reception unit 101c change because user moves, although be the use of the improper communication of repeater, the RSSI of two mensuration signals Srs1, Srs2 still likely produces difference.
Specifically, as shown in the position P1 of Fig. 4, electron key 10 be positioned at the 1st sending zone 31 circumferentially time, the difference of the RSSI of two mensuration signals Srs1, Srs2 exceedes threshold value.On the other hand, when employing repeater 101, be positioned at electron key 10 on the position P2 of Fig. 4 when schedule time T1 moves towards the direction contrary with transmission and reception unit 101c, the RSSI of the 2nd mensuration signal Srs2 becomes less than the RSSI of the 1st mensuration signal Srs1, and the difference of the RSSI of two mensuration signals Srs1, Srs2 is likely greater than threshold value.
When employing repeater 101, the condition that the difference of two RSSI exceedes threshold value is that the amount of movement of electron key 10 is greater than by the difference of the radius of two sending zones 31,32, the distance namely represented by radius R 1-radius R 2.
In this, in the present embodiment, the difference of the RSSI of two mensuration signals Srs1, Srs2 can not be greater than threshold value.That is, the schedule time T1 involved by transmission of two mensuration signals Srs1, Srs2 is configured to make the difference of two RSSI to be greater than threshold value.Schedule time T1 is set to time when electron key 10 can only move the distance of " radius R 1-radius R 2 ".When calculating this schedule time T1, such as, determine maximum translational speed Vmax during user's walking.Then, by " radius R 1-radius R 2 " is calculated schedule time T1 divided by maximum translational speed Vmax.Such as, maximum translational speed Vmax be 5km/h and " radius R 1-radius R 2 " for 40cm when, schedule time T1 is about 300ms.Thus, even if when electron key 10 moves with the maximum translational speed Vmax of 5km/h, this displacement is 40cm.The difference of the RSSI of two mensuration signals Srs1, Srs2 is in this case equal with threshold value.Therefore, because the difference of two RSSI is below threshold value, so the improper communication being the use of repeater can be judged.Even if like this when electron key 10 moves, still can correctly judge and be the use of the improper communication of repeater.
Then, according to the process flow diagram of Fig. 5, the action in electron key control part 11 and vehicle-mounted control portion 21 is described.This process flow diagram repeatedly performs under such as engine stop-state.
First, vehicle-mounted control portion 21 recognizes lock-up cock 36 or tail-off 33 when having been carried out operation, sends wake-up signal Swk and the 1st continuously and measures and measure with signal Srs2 (S101 and S102) with signal Srs1 and wake-up signal Swk and the 2nd.Electron key control part 11, when receiving various signal, identifies (S103) the RSSI of two mensuration signals Srs1, Srs2.Then, electron key control part 11 sends answer signal Sac (S104).Vehicle-mounted control portion 21, when receiving answer signal Sac, sends challenge signal Scc (S105).Electron key control part 11, when receiving challenge signal Scc, sends response signal Sre (S106).Vehicle-mounted control portion 21 is when receiving response signal Sre and be judged as that response check and ID code check are set up (S107), according to the RSSI information be included in response signal Sre, judge whether the communication this time and between electron key 10 is the use of the improper communication (S108) of repeater.When vehicle-mounted control portion 21 is judged as the improper communication not being the use of repeater (being "No" in S108), carry out the startup of engine or the unblock (S109) of car door.On the other hand, vehicle-mounted control portion 21 is (being "Yes" in S108) when being judged as YES the improper communication employing repeater, do not carry out the startup of engine or the unblock of car door, terminate this process flow diagram.
According to embodiment described above, following action effect can be played.
(1) from two mensuration signals Srs1, Srs2 that car-mounted device 20 strength of transmitted signals is different.When two mensuration are with when the difference of the RSSI of signal Srs1, Srs2 is below threshold value, be judged as YES the improper communication employing repeater 101.Because repeater 101 does not imitate the signal intensity of wireless signal, so when employing repeater 101, be approximately zero from the difference of the RSSI of two mensuration signals Srs1, Srs2 of repeater 101 transmission.But if when employing repeater 101, user carries electron key 10 when moving, and produces difference between the RSSI of two mensuration signals Srs1, Srs2 being detected by RSSI testing circuit 16.For this point, in the above-described configuration, in schedule time T1, two mensuration signal Srs1, Srs2 are sent.Schedule time T1 is set shorter, in the schedule time T1 electron key 10 can the distance of movement less, so the difference of the RSSI of two mensuration signals Srs1, Srs2 is less.From this viewpoint, the schedule time, T1 was configured to, when have sent identical two mensuration signals Srs1, the Srs2 of signal intensity from repeater 101, the difference of the RSSI of two mensuration signals Srs1, Srs2 that the movement with electron key 10 produces is below threshold value.Thus, even if when electron key 10 moves, the improper communication being the use of repeater also correctly can be judged.
(2) schedule time T1 is calculated by the difference " radius R 1-radius R 2 " of the radius by two sending zones 31,32 divided by maximum translational speed Vmax.Therefore, the displacement of electron key 10 in schedule time T1 is prevented to be greater than the distance represented by " radius R 1-radius R 2 ".Thus, can avoid, when have sent identical two mensuration signals Srs1, the Srs2 of signal intensity from repeater 101, the difference of the RSSI of two mensuration signals Srs1, Srs2 producing with the movement of electron key 10 exceedes threshold value, is judged as the improper communication not being the use of repeater 101 with even leading to errors.
(3) testing result of RSSI testing circuit 16 is sent to car-mounted device 20 by response signal Sre.Car-mounted device 20, according to the testing result of the RSSI testing circuit 16 be included in response signal Sre, can judge the improper communication whether being the use of repeater.Carry out above-mentioned judgement by car-mounted device 20 like this, the process involved by the judgement on electron key 10 can be omitted.
In addition, above-mentioned embodiment can according to having carried out implementing as under type of suitable change.
In the above-described embodiment, electron key 10 does not carry out any judgement to the testing result of RSSI testing circuit 16, just just this testing result is included in response signal Sre and sends.But electron key control part 11 also as judging part, can judge whether according to the testing result of RSSI testing circuit 16 the improper communication (S108) being the use of repeater.This judged result is included in wireless signal and is sent to car-mounted device 20 by electron key 10.Car-mounted device 20 determines whether by door unlock or by engine start according to the judged result comprised in described wireless signal.
Also the RSSI testing circuit 16 in above-mentioned embodiment and LF acceptance division 12 can be provided separately.
In the above-described embodiment, two mensuration signals Srs1, Srs2 are sent to electron key 10 from car-mounted device 20.But, also can send two mensuration signals Srs1, Srs2 from electron key 10 to car-mounted device 20.In this case, RSSI testing circuit 16 is arranged on vehicle-mounted acceptance division 24, or is disposed on car-mounted device 20 with vehicle-mounted acceptance division 24.In the structure shown here, because the RSSI of two mensuration signals Srs1, Srs2 changes, so can obtain the action effect identical with above-mentioned embodiment with the movement of electron key 10.
In the above-described embodiment, two mensuration signals Srs1, Srs2 send respectively after wake-up signal Swk.But, also after have sent a wake-up signal Swk, two can be sent continuously and measure with signal Srs1, Srs2.In addition, also wake-up signal Swk can be omitted.
In the above-described embodiment, RSSI information is comprised in response signal Sre and sends.But, also can separate with response signal, send the RSSI information signal only comprising RSSI information.In addition, also RSSI information can be included in answer signal Sac.
In the above-described embodiment, have sent 2 mensuration signals Srs1, Srs2.But, as long as have multiple mensuration signal, more than 3 mensuration signals also can be sent.In this case, according to the difference of the RSSI of each mensuration signal, can correctly judge and whether be the use of the improper communication of repeater.
In the above-described embodiment, the outer sending part 22 of car and Che Nei sending part 23 is provided with.But, the inside and outside sending part shared of car also can be set.This sending part forms sending zone in car indoor and outdoor.
Step S107 in above-mentioned embodiment and the process of step S108 can be carried out on the contrary.In this case, when being judged as YES the improper communication employing repeater, not carrying out response check and ID code check, terminating this process flow diagram.
In the above-described embodiment, send the wireless signal of LF band from car-mounted device 20, send the wireless signal of UHF band from electron key 10.But the frequency band of the wireless signal of transmission and reception is not limited thereto between car-mounted device 20 and electron key 10.
In the above-described embodiment, the car-mounted device 20 as control object carries out the locking of car door, unblock etc. by the radio communication between electron key 10.But control object is not limited to car-mounted device 20, also can be such as the door gear of house.In this case, also can prevent the improper communication employing repeater identically with above-mentioned embodiment.
Claims (6)
1. an electron key system, performs the control to described control object by transmission and reception wireless signal between control object and electron key, it is characterized in that,
Described control object in the given time to multiple wireless signals that described electron key strength of transmitted signals is different,
Described electron key system comprises:
Test section, is arranged on described electron key, detect send from described control object each described in the signal intensity of wireless signal; With
Judging part, be arranged on described control object or described electron key, when recognized by described test section each described in the difference of signal intensity of wireless signal exceed the threshold value of difference setting of the signal intensity of each wireless signal according to described transmission time, judging part is judged as the improper communication not being the use of repeater, allow to perform the control to described control object, and when recognized by described test section each described in the difference of signal intensity of wireless signal below described threshold value time, judging part is judged as YES the improper communication employing repeater, forbid performing the control to described control object,
The described schedule time is configured to, when have sent the signal of wireless signal described in each by repeater with identical intensity with the movement of described electron key within the described schedule time, described electron key receive from described repeater each described in the difference of signal intensity of wireless signal below threshold value.
2. electron key system according to claim 1, is characterized in that,
The described schedule time is by the maximum translational speed of the difference of the arrival of wireless signal described in each corresponding with the signal intensity of wireless signal described in each distance divided by the user supposed being calculated.
3. electron key system according to claim 1 and 2, is characterized in that,
Described electron key by recognized by described test section from described control object each described in the signal intensity of wireless signal-each mensuration signal be included in signal strength information signal and send,
Described judging part is arranged in described control object, according to the signal intensity being included in described signal strength information signal described in each mensuration signal, judges whether the improper communication being the use of repeater.
4. electron key system according to claim 3, is characterized in that,
Described signal strength information signal is the response signal also comprising the intrinsic ID code of described electron key except the testing result except comprising described test section, described control object is when receiving described response signal, carry out the verification between the ID code that comprises in described response signal and the ID code self prestored, when the verification of described ID code is set up, described judging part judges whether according to the testing result of the described test section comprised in described response signal the improper communication being the use of repeater.
5. an electron key system, performs the control to described control object by transmission and reception wireless signal between control object and electron key, it is characterized in that,
Described electron key in the given time to multiple wireless signals that described control object strength of transmitted signals is different,
Described electron key system comprises:
Test section, is arranged in described control object, detect send from described electron key each described in the signal intensity of wireless signal; With
Judging part, be arranged on described control object or described electron key, when recognized by described test section each described in the difference of signal intensity of wireless signal exceed the threshold value of difference setting of the signal intensity of each wireless signal according to described transmission time, judging part is judged as the improper communication not being the use of repeater, allow to perform the control to described control object, and when recognized by described test section each described in the difference of signal intensity of wireless signal below described threshold value time, judging part is judged as YES the improper communication employing repeater, forbid performing the control to described control object,
The described schedule time is configured to, when have sent the signal of wireless signal described in each by repeater with identical intensity with the movement of described electron key within the described schedule time, described electron key receive from described repeater each described in the difference of signal intensity of wireless signal below threshold value.
6. electron key system according to claim 5, is characterized in that,
The described schedule time is by the maximum translational speed of the difference of the arrival of wireless signal described in each corresponding with the signal intensity of wireless signal described in each distance divided by the user supposed being calculated.
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| JP2011004066A JP5391211B2 (en) | 2011-01-12 | 2011-01-12 | Electronic key system |
| JP2011-004066 | 2011-01-12 |
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| CN102708605B true CN102708605B (en) | 2016-02-10 |
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| JP2012144905A (en) | 2012-08-02 |
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