CN102708605A - Electronic key system - Google Patents
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- CN102708605A CN102708605A CN2012100211412A CN201210021141A CN102708605A CN 102708605 A CN102708605 A CN 102708605A CN 2012100211412 A CN2012100211412 A CN 2012100211412A CN 201210021141 A CN201210021141 A CN 201210021141A CN 102708605 A CN102708605 A CN 102708605A
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Abstract
An electronic key system can be used for correctly judging whether improper communication of a repeater is used or not. Two detection signals (Srs1, Srs2) of different signal intensity are sent from a vehicle-mounted device (20). When RSSI difference of the two detection signals is below a threshold, improper communication of the repeater is used. The two detection signals (Srs1, Srs2) are sent within a predetermined time. The predetermined time is set in a situation that two detection signals (Srs1, Srs2) of same signal intensity are sent from the repeater, and the RSSI of the two detection signals (Srs1, Srs2) generated along with the movement of the electronic key (10) is below the threshold. Thus, even when the electronic key (10)is moved, whether improper communication of the repeater is used can be correctly judged.
Description
Technical field
The present invention relates to electron key system.
Background technology
In electron key system in the past; Through between electron key and vehicle, carrying out radio communication, allow that car door is locked, car door release
engine start etc.For example, vehicle possesses car internal antenna and car outside antenna, and car internal antenna communication zone in car sends and requires signal, and car outside antenna communication zone outside the car of vehicle-surroundings sends and requires signal.When the electron key that enters into certain communication zone receives when requiring signal, send the answer signal that comprises the ID code to vehicle.When the verification of communication zone and the ID code that comprises from the answer signal of electron key was set up outside electron key is arranged in car, vehicle allowed car door is locked or release.On the other hand, when electron key is arranged in the car communication zone and the verification of the ID code that comprises from the answer signal of electron key when setting up, vehicle allows engine start.
In recent years; The repeater that employing relaying electric wave (requiring signal
answer signal) occurred, with not inside and outside car the electron key in the communication zone disguise oneself as like being positioned at the improper communication of communication zone outside car communication zone or the car.Through using this repeater to carry out improper communication, might carry out car door release or engine start wrongly.So for example disclosed like patent documentation 1, research is adopted guard measure to the improper communication of having used repeater.
Patent documentation 1: TOHKEMY 2006-118886 communique
The applicant has studied through changing the signal intensity of between vehicle and electron key, sending the wireless signal that receives and has prevented to use repeater to carry out improper communication.For example, vehicle different a plurality of wireless signals of strength of transmitted signals successively.Electron key detects the signal intensity separately of a plurality of wireless signals that send from vehicle.At this, repeater can not imitate the signal intensity of wireless signal.That is to say, even repeater receives the different a plurality of wireless signals of signal intensity from vehicle, also all to the identical wireless signal of electron key strength of transmitted signals.Therefore, exist between vehicle and the electron key under the situation of repeater, electron key receives the identical wireless signal of signal intensity.At this moment, electron key can be judged the improper communication that the communication of being carried out has been to use repeater, thereby does not allow the car door release.
Yet in said structure; Electron key if from receiving wireless signal after, play receive before the next wireless signal during mobile; Although then there is repeater, might make that also the signal intensity of each wireless signal that electron key received becomes difference.Thus, although using repeater, also might be judged as the improper communication that has not been to use repeater.
Summary of the invention
The present invention is In view of the foregoing and proposes, and its purpose is, a kind of electron key system of the improper communication that whether has been to use repeater of can judging rightly is provided.
Explanation is used to realize the means and the action effect thereof of above-mentioned purpose below.
The related electron key system in the 1st aspect of the present invention; Receive the control that wireless signal is carried out said controlling object through between controlling object and electron key, sending; The different a plurality of wireless signals of the introversive at the fixed time said electron key strength of transmitted signals of said controlling object; Said electron key system comprises: test section, be set on the said electron key, and detect from the signal intensity of each said wireless signal of said controlling object transmission; And judging part; Be set on said controlling object or the said electron key; When the difference of the signal intensity of each the said wireless signal that recognizes through said test section surpasses the difference preset threshold according to the signal intensity of each wireless signal of said transmission; Judgement section judges is not for being to use the improper communication of repeater; Allow to carry out the control of said controlling object, and the difference of the signal intensity of each the said wireless signal that recognizes through said test section is when said threshold value is following, judgement section judges is the improper communication that has been to use repeater; Forbid carrying out the control of said controlling object; The said schedule time is configured to, and is making the signal intensity of each said wireless signal become under the identical situation through repeater, follow said electron key in the said schedule time move and produce from the difference of the signal intensity of each wireless signal of said repeater below threshold value.
According to this structure, a plurality of wireless signals that strength of transmitted signals is different.The difference of the signal intensity of these signals is judged as the improper communication that has been to use repeater when threshold value is following.This is because repeater does not imitate the signal intensity of wireless signal, so under the situation of having used repeater, the difference of the signal intensity of each wireless signal that sends from repeater is approximately zero.Yet under the situation of having used repeater, because the electron key that the user carries moves, it is poor to cause through producing on the signal intensity of detected each wireless signal of test section.For this point, in said structure, send each wireless signal in the given time.The schedule time is set shortly more, and the distance that electron key can move in the given time is more little, and the difference of the signal intensity of each wireless signal that produces so follow moving of electron key is more little.From such viewpoint, the schedule time is configured to, under the situation of having sent the identical a plurality of wireless signals of signal intensity from repeater, follow moving of electron key and the difference of the signal intensity of each wireless signal of producing below threshold value.Thus, even under the situation that electron key has moved, also can to judge rightly out be to use the improper communication of repeater.
The described invention in the 2nd aspect of the present invention; Aspect the 1st in the described electron key system, the said schedule time is that the difference that the signal through will be corresponding with the signal intensity of each said wireless signal arrives distance is calculated divided by the user's who sets maximum translational speed.
According to this structure, can prevent that signal that electron key is moved beyond each wireless signal in the given time from arriving the distance of the difference of distance.Thus; Under the situation of having sent the identical a plurality of wireless signals of signal intensity from repeater; The difference of the signal intensity of each wireless signal that can suppress to produce because of moving of electron key further can suppress to be judged as by error the improper communication that has not been to use repeater above threshold value.
The described invention in the 3rd aspect of the present invention; Aspect the 1st or in the described electron key system in the 2nd aspect; Each said mensuration that said electron key will recognize through said test section is included in the signal strength information signal with the signal intensity of signal and sends; Said judging part is set on the said controlling object, according to being included in each said mensuration in the said signal strength information signal with the signal intensity of signal, has judged whether to be to use the improper communication of repeater.
Constitute according to this, the testing result of test section is comprised in the signal strength information signal and sends to controlling object.Thus, can whether be to use the improper communication of repeater through the judgement section judges on the controlling object.Like this, through judging part is arranged on the controlling object, can require the further miniaturization of electron key of higher portability than controlling object.
The described invention in the 4th aspect of the present invention; Aspect the 3rd in the described electron key system; Said signal strength information signal is the response signal that except the testing result of said test section, also comprises the intrinsic ID code of said electron key; Said controlling object is when receiving said response signal; Carry out the verification between ID code that comprises in the said response signal and the ID code of self storing in advance, when the verification of said ID code was set up, said judging part had judged whether to be to use the improper communication of repeater according to the testing result of the said test section that comprises in the said response signal.
According to this structure, when the verification of ID code is set up, judged whether to be to use the improper communication of repeater.Thus, can reduce the judgement number of times.
The related electron key system in the 5th aspect of the present invention; Receive the control that wireless signal is carried out said controlling object through between controlling object and electron key, sending; The different a plurality of wireless signals of the introversive at the fixed time said controlling object strength of transmitted signals of said electron key; Said electron key system comprises: test section, be set on the said controlling object, and detect from the signal intensity of each said wireless signal of said electron key transmission; And judging part; Be set on said controlling object or the said electron key; When the difference of the signal intensity of each the said wireless signal that recognizes through said test section surpasses the difference preset threshold according to the signal intensity of each wireless signal of said transmission; Judgement section judges is not for being to use the improper communication of repeater; Allow to carry out the control of said controlling object, and the difference of the signal intensity of each the said wireless signal that recognizes through said test section is when said threshold value is following, judgement section judges is the improper communication that has been to use repeater; Forbid carrying out the control of said controlling object; The said schedule time is configured to, and is making the signal intensity of each said wireless signal become under the identical situation through repeater, follow said electron key in the said schedule time move and produce from the difference of the signal intensity of each wireless signal of said repeater below threshold value.
Constitute according to this, also can access the effect identical with the 1st aspect.
The described invention in the 6th aspect of the present invention; Aspect the 5th in the described electron key system, the said schedule time is that the difference that the signal through will be corresponding with the signal intensity of each said wireless signal arrives distance is calculated divided by the user's who sets maximum translational speed.
Constitute according to this, also can access the effect identical with the 2nd aspect.
The invention effect
According to the present invention, whether in electron key system, can judge rightly more has been to use the improper communication of repeater.
Description of drawings
Fig. 1 is the structural drawing of electron key system.
Fig. 2 illustrates the reception signal intensity of various signals and sends the time diagram in correct time.
Fig. 3 shows the vertical view of mensuration with the vehicle of the sending zone of signal etc.
Fig. 4 is the partial enlarged drawing of Fig. 3.
Fig. 5 is the process flow diagram that the treatment step of electron key control part 11 and vehicle-mounted control portion 21 is shown.
Description of reference numerals
1 ... Electron key system, 10 ... Electron key, 20 ... Car-mounted device (controlling 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 of being held by the user 10 and car-mounted device 20.Between electron key 10 and car-mounted device 20, intercom mutually, setting up with this communication zone that intercoms mutually outside car is condition, allows car door to lock or release, and setting up with this communication zone that intercoms mutually in car is condition, allows 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, and 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.In this storer 11a, store the intrinsic ID code of electron key 10.
As shown in Figure 2, LF acceptance division 12 possesses receiving antenna 12a, receives continuously the wake-up signal Swk and the 1st that sends from car-mounted device 20 through this receiving antenna 12a and measures with signal Srs1 and wake-up signal Swk and the 2nd mensuration and use signal Srs2.And LF acceptance division 12 outputs to electron key control part 11 after these signals are demodulated to pulse signal.Wake-up signal Swk and two mensuration are the wireless signal of LF (Low Frequency, low frequency) band with signal Srs1, Srs2.
And as shown in Figure 1, LF acceptance division 12 is provided with RSSI testing circuit 16.16 pairs of two mensuration of RSSI testing circuit detect with the reception signal intensity (Receive SignalStrength Indication abbreviates RSSI below sometimes as) of signal Srs1, Srs2, and testing result is outputed to electron key control part 11.
Electron key control part 11 is identified in the RSSI of each mensuration of wake-up signal Swk input afterwards with signal Srs1, Srs2 through RSSI testing circuit 16 when recognizing wake-up signal Swk.And electron key control part 11 generates answer signal (ack signal) Sac when recognizing the 2nd wake-up signal Swk and the 2nd mensuration with signal Srs2, and Sac exports to UHF sending part 13 with this answer signal.13 couples of answer signal Sac of UHF sending part modulate, and through transmitting antenna 13a, the answer signal Sac after the modulation are sent to car-mounted device 20 as the wireless signal that UHF (Ultra High Frequency, ultrahigh frequency) is with.
As shown in Figure 2, to this answer signal Sac, send inquiry signal Scc to electron key 10 from car-mounted device 20.
When LF acceptance division 12 receives inquiry signal Scc through receiving antenna 12a, should address inquires to signal Scc and be demodulated into pulse signal, the pulse signal after the demodulation was outputed to electron key control part 11.Electron key control part 11 is discerned addressing inquires to the inquiry code that contains among the signal Scc when the inquiry signal Scc that receives from LF acceptance division 12.Then, 11 pairs of these inquiry codes of electron key control part are encrypted, and generate response code.
Electron key control part 11 generates with above-mentioned response code with as two mensuration of RSSI information and is included in interior response signal Sre with the RSSI of signal Srs1, Srs2, and electron key control part 11 outputs to UHF sending part 13 with this response signal Sre.13 couples of response signal Sre of UHF sending part modulate, and the response signal Sre after will modulating sends to car-mounted device 20 through 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, the car.The outer sending part 22 of car is provided with transmitting antenna 22a, and sending part 23 is provided with transmitting antenna 23a in the car, and vehicle-mounted acceptance division 24 is provided with receiving antenna 24a.
In addition, electric lock-up cock 36, tail-off 33, car door locking device 34 and the engine device 35 of being connected with in vehicle-mounted control portion 21.
Shown in amplifying in the circle of Fig. 3, the outer sending part 22 of car is set at the inside of the outside door handle 4 of car door.In addition, lock-up cock 36 is set on the outside door handle 4, and when the user had carried out pressing operation to lock-up cock 36, the operation signal that lock-up cock 36 will represent to be carried out operation outputed to vehicle-mounted control portion 21.
Vehicle-mounted acceptance division 24 is set at the indoor substantial middle of car.In addition, sending part 23 is provided with 2 along the above-below direction of Fig. 3 in that car is indoor in the car.In addition, tail-off 33 is set near the driver's seat, and when the user had carried out pressing operation to tail-off 33, the operation signal that tail-off 33 will represent to be carried out operation outputed to vehicle-mounted control portion 21.In addition, car door locking device 34 is under the state of closing of the door, automatically car door to be locked or the device of release.
Vehicle-mounted control portion 21 is made up of computer unit, has non-volatile storer 21a.In this storer 21a, store the ID code identical with the ID code of in the storage part 11a of electron key 10, storing.
When vehicle-mounted control portion 21 recognizes lock-up cock 36 when having been carried out operation, generate wake-up signal Swk and the 1st successively and measure to measure and use signal Srs2 with signal Srs1 and wake-up signal Swk and the 2nd, these signals are outputed to car sending part 22 outward.
The outer sending part 22 of car receives from vehicle-mounted control portion 21 when the wake-up signal Swk and the 1st of input measure with signal Srs1 and wake-up signal Swk and the 2nd mensuration with signal Srs2 continuously, successively these signals is modulated.Then, the signal after the outer sending part 22 of car is modulated these sends as the wireless signal of LF band through transmitting antenna 22a.
As shown in Figure 2, the 1st mensuration is configured to measure than the 2nd big with the signal intensity of signal Srs2 with the signal intensity of signal Srs1.Therefore, the 1st mensuration is measured different with the sending zone of signal Srs2 with signal Srs1 and the 2nd.Say that at length as shown in Figure 3, the 1st mensuration is sent to the 1st sending zone 31 that forms semicircle shape at each door outside with signal Srs1.The 1st sending zone 31 is the center, forms with radius R 1 with outside door handle 4.In addition, the 2nd mensuration is sent to form the 2nd sending zone 32 of semicircle shape than radius R 1 little radius R 2 with signal Srs2.That is to say that the 2nd sending zone 32 forms and is included in the 1st sending zone 31.In this embodiment, radius R 2 is set to 40cm with the difference of radius R 1.In other words, two mensuration use the signal intensity of signal Srs1, Srs2 to be configured to make the radius R 2 and the difference of radius R 1 to be 40cm.
In addition, as shown in Figure 2, two mensuration with signal Srs1, Srs2 respectively at the fixed time T1 during in be sent out.In this embodiment, the schedule time, T1 was set to 300ms.Computing method for this schedule time T1 will be elaborated in the back.
As shown in Figure 2, electron key 10 is beamed back answer signal Sac to car-mounted device 20 when receiving the 2nd wake-up signal Swk and the 2nd mensuration with signal Srs2.
The vehicle-mounted acceptance division 24 of car-mounted device 20 receives answer signal Sac through receiving antenna 24a.Then, vehicle-mounted acceptance division 24 is demodulated into pulse signal with answer signal Sac, and the pulse signal after the demodulation is outputed to vehicle-mounted control portion 21.
Vehicle-mounted control portion 21 is when recognizing answer signal Sac, and generation comprises the inquiry signal Scc that addresses inquires to code, will address inquires to signal Scc and output to the outer sending part 22 of car.At this moment, vehicle-mounted control portion 21 generates response code through the inquiry code is encrypted.Electron key 10 adopts same key with car-mounted device 20 in encryption.The outer sending part 22 of car is modulated addressing inquires to signal Scc when the inquiry signal Scc that receives from vehicle-mounted control portion 21, and the signal after this modulation is sent through transmitting antenna 22a.
As shown in Figure 2, to addressing inquires to signal Scc, beam back response signal Sre to car-mounted device 20 from electron key 10.
The vehicle-mounted acceptance division 24 of car-mounted device 20 receives the response signal Sre from electron key 10 through receiving antenna 24a.Then, vehicle-mounted acceptance division 24 is demodulated into pulse signal with response signal Sre, and the pulse signal after the demodulation is outputed to vehicle-mounted control portion 21.
The ID code that comprises among 21 couples of response signal Sre of vehicle-mounted control portion, response code, discern as two mensuration of RSSI information RSSI with signal Srs1, Srs2.Vehicle-mounted control portion 21 carries out the response code that self generates and is included in the verification (response check) between the response code among the response signal Sre.In addition, vehicle-mounted control portion 21 is included in the ID code among the response signal Sre and is stored in the verification (ID code check) between the ID code among the storer 21a.Vehicle-mounted control portion 21 has judged whether to be to use the improper communication of repeater when being judged as the establishment of response check and ID code check.
At length say; Vehicle-mounted control portion 21 go out according to the RSSI information Recognition the 1st when measuring with the RSSI of signal Srs1 and the 2nd mensuration with the difference of the RSSI of signal Srs2 above threshold value, be judged as with electron key 10 between communicate by letter and be not to use the improper communication of repeater.In addition, vehicle-mounted control portion 21 identify the 1st measure to use signal Srs1 RSSI and the 2nd mensuration use signal Srs2 the difference of RSSI as threshold value when following, be judged as with electron key 10 between communicate by letter and be to use the improper communication of repeater.This threshold value is set with the difference of the RSSI of signal Srs1, Srs2 according to two mensuration of sending from car-mounted device 20.
The locking state or the released state of car door switched in vehicle-mounted control portion 21 through car door locking device 34 when judging the improper communication that has not been to use repeater.On the other hand, vehicle-mounted control portion 21 does not make car door locking device 34 carry out the switching of the locking state or the released state of car door when being judged as the improper communication that has been to use repeater.
In addition; Identical when having been carried out operation with above-mentioned lock-up cock 36; Vehicle-mounted control portion 21 is recognizing tail-off 33 when having been carried out operation, and the transmitting antenna 23a through sending part in the car 23 measures wake-up signal Swk and the 1st that to send to car with signal Srs1 and wake-up signal Swk and the 2nd mensuration continuously with signal Srs2 indoor.The signal intensity of these signals and to send correct time identical correct time with above-mentioned signal intensity and transmission when sending signals through the outer sending part 22 of car.Vehicle-mounted control portion 21 has judged whether to be to use the improper communication of repeater when being judged as the establishment of response check and ID code check.Then, when vehicle-mounted control portion 21 is judged as the improper communication that has not been to use repeater, through engine device 35 starting engines.On the other hand, vehicle-mounted control portion 21 does not make engine start when being judged as the improper communication that has been to use repeater.
Then, with reference to Fig. 4, the processing action of the improper communication of having used repeater and the car-mounted device when carrying out improper communication 20 and electron key 10 is described.
As shown in Figure 4; Repeater 101 possesses transmission receiving element 101a, cable 101b and sends receiving element 101c, sends receiving element 101a reception wake-up signal Swk, two mensuration with signal Srs1, Srs2 and inquiry signal Scc through sending receiving element 101a.Repeater 101 will send from being positioned at the locational transmission receiving element 101c that leaves vehicle via cable 101b through sending wake-up signal Swk that receiving element 101a receives etc.Thus, wake-up signal Swk etc. is relayed to the electron key 10 that communication zone leaves inside and outside the car of vehicle through repeater 101.At this moment, repeater 101 does not imitate the signal intensity of various signals.That is to say,, still send two mensuration with signal Srs1, Srs2 with identical signal intensity through sending receiving element 101c even repeater 101 receives two different mensuration of RSSI with signal Srs1, Srs2 through sending receiving element 101a.
At this moment, electron key control part 11 is discerned from the RSSI of two mensuration of sending receiving element 101c with signal Srs1, Srs2 through 16 pairs of RSSI testing circuits.At this moment, as stated, two mensuration are identical with the signal intensity of signal Srs1, Srs2.Therefore, electron key control part 11 identify the 1st measure with the RSSI of signal Srs1 and the 2nd mensuration with the difference of the RSSI of signal Srs2 when threshold value is following, be judged as the improper communication that has been to use repeater.
At this, for example, the electron key 10 that the user held moves, and the distance of sending between receiving element 101c and the electron key 10 changes.What electron key 10 received is inversely proportional to from the RSSI of the wireless signal that sends receiving element 101c and the distance of sending between receiving element 101c and the electron key 10.
Therefore; From receive the 1st play after measuring with signal Srs1 receive the 2nd mensuration with signal Srs2 before during; Move under the situation that makes between electron key 10 and the transmission receiving element 101c because of the user apart from change; Although be to use the improper communication of repeater, it is poor that two mensuration still might produce with the RSSI of signal Srs1, Srs2.
Specifically, shown in the position P1 of Fig. 4, when electron key 10 was positioned on the circumference of the 1st sending zone 31, two mensuration surpassed threshold value with the difference of the RSSI of signal Srs1, Srs2.On the other hand; Under the situation of having used repeater 101; Be positioned on the position P2 of Fig. 4 electron key 10 at the fixed time T1 towards with send the opposite direction of receiving element 101c when having moved; The 2nd mensuration becomes littler with the RSSI of signal Srs1 than the 1st mensuration with the RSSI of signal Srs2, and two mensuration might be greater than threshold value with the difference of the RSSI of signal Srs1, Srs2.
Under the situation of having used repeater 101, the condition that the difference of two RSSI surpasses threshold value is, the amount of movement of electron key 10 greater than by the radius of two sending zones 31,32 poor, be the represented distance of radius R 1-radius R 2.
In this, in this embodiment, two mensuration can be greater than threshold value with the difference of the RSSI of signal Srs1, Srs2.That is to say that two mensuration are configured to make that with the related schedule time T1 of the transmission of signal Srs1, Srs2 the difference of two RSSI can be greater than threshold value.Schedule time T1 be set to electron key 10 can only move " radius R 1-radius R 2 " apart from the time time.Calculating should the schedule time T1 time the maximum translational speed Vmax when for example determining user's walking.Then, through " radius R 1-radius R 2 " calculated schedule time T1 divided by maximum translational speed Vmax.For example, maximum translational speed Vmax is that 5km/h and " radius R 1-radius R 2 " are that schedule time T1 is about 300ms under the situation of 40cm.Thus, even under the situation that electron key 10 moves with the maximum translational speed Vmax of 5km/h, this displacement is 40cm.Two mensuration in this case equate with threshold value with the difference of the RSSI of signal Srs1, Srs2.Therefore, since the difference of two RSSI below threshold value, so can judge the improper communication that has been to use repeater.Even under the situation that electron key 10 moves, still can judge rightly out has been to use the improper communication of repeater like this.
Then, according to the process flow diagram of Fig. 5, the action of electron key control part 11 and vehicle-mounted control portion 21 is described.This process flow diagram is for example being carried out under the engine stop-state repeatedly.
At 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 with signal Srs1 and wake-up signal Swk and the 2nd mensuration with signal Srs2 (S101 and S102).Electron key control part 11 is discerned (S103) to two mensuration with the RSSI of signal Srs1, Srs2 when receiving various signal.Then, electron key control part 11 sends answer signal Sac (S104).Vehicle-mounted control portion 21 sends and addresses inquires to signal Scc (S105) when receiving answer signal Sac.Electron key control part 11 sends response signal Sre (S106) when receiving inquiry signal Scc.Vehicle-mounted control portion 21 is receiving response signal Sre and is being judged as response check and ID code check when setting up (S107); According to the RSSI information that is included among the response signal Sre, judge this time with electron key 10 between the improper communication (S108) of communicating by letter and whether being to use repeater.(be " denying " among the S108) when vehicle-mounted control portion 21 is judged as the improper communication that has not been to use repeater, carry out the startup of engine or the release of car door (S109).On the other hand, vehicle-mounted control portion 21 (is " being ") among the S108 when being judged as the improper communication that has been to use repeater, do not carry out the startup of engine or the release of car door, finishes this process flow diagram.
According to the embodiment of above explanation, can bring into play following action effect.
(1) from different two mensuration of car-mounted device 20 strength of transmitted signals with signal Srs1, Srs2.When two mensuration with the difference of the RSSI of signal Srs1, Srs2 when threshold value is following, be judged as the improper communication that has been to use repeater 101.Because repeater 101 signal intensity of not imitating wireless signal, so under the situation of having used repeater 101, two mensuration of sending from repeater 101 are approximately zero with the difference of the RSSI of signal Srs1, Srs2.But, if under the situation of having used repeater 101, when the user is carrying electron key 10 and moves, through producing difference between RSSI testing circuit 16 detected two RSSI of mensuration with signal Srs1, Srs2.To this point, in above-mentioned formation, send two mensuration at the fixed time in the T1 with signal Srs1, Srs2.Schedule time T1 is set shortly more, and the distance that electron key 10 can move in the T1 at the fixed time is more little, so two mensuration are more little with the difference of the RSSI of signal Srs1, Srs2.From this viewpoint; The schedule time, T1 was configured to; Sending from repeater 101 under the identical situation of two mensuration of signal intensity with signal Srs1, Srs2, follow two mensuration that moving of electron key 10 produced with the difference of the RSSI of signal Srs1, Srs2 below threshold value.Thus, even under the situation that electron key 10 has moved, also can correctly judge the improper communication that has been to use repeater.
(2) calculate schedule time T1 through poor " radius R 1-radius R 2 " with the radius of two sending zones 31,32 divided by maximum translational speed Vmax.Therefore, prevent electron key 10 at the fixed time the displacement in the T1 greater than distance by " radius R 1-radius R 2 " expression.Thus; Can avoid; Sending from repeater 101 under the identical situation of two mensuration of signal intensity with signal Srs1, Srs2; Two mensuration following moving of electron key 10 and produce surpass threshold value with the difference of the RSSI of signal Srs1, Srs2, even are judged as the improper communication that has not been to use repeater 101 with leading to errors.
(3) testing result of RSSI testing circuit 16 is sent out to car-mounted device 20 through response signal Sre.Car-mounted device 20 can be judged the improper communication that whether has been to use repeater according to the testing result that is included in the RSSI testing circuit 16 among the response signal Sre.Carry out above-mentioned judgement through car-mounted device 20 like this, can omit the related processing of judgement on the electron key 10.
In addition, above-mentioned embodiment can be implemented according to the following mode of having carried out 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 among the response signal Sre and sends.But electron key control part 11 also can be used as judging part, has judged whether to be to use the improper communication (S108) of repeater according to the testing result of RSSI testing circuit 16.Electron key 10 is included in this judged result and sends to car-mounted device 20 in the wireless signal.Car-mounted device 20 determines whether with the car door release or with engine start according to the judged result that comprises in the said wireless signal.
Also can RSSI testing circuit in the above-mentioned embodiment 16 and LF acceptance division be arranged in 12 minutes.
In the above-described embodiment, two mensuration are to send to electron key 10 from car-mounted device 20 with signal Srs1, Srs2.But, also can send two mensuration with signal Srs1, Srs2 to car-mounted device 20 from electron key 10.In this case, RSSI testing circuit 16 is set on the vehicle-mounted acceptance division 24, or opens in 24 minutes with vehicle-mounted acceptance division and to be arranged on the car-mounted device 20.In this structure, owing to two mensuration follow moving of electron key 10 to change with the RSSI of signal Srs1, Srs2, so can access the action effect identical with above-mentioned embodiment.
In the above-described embodiment, two mensuration are sent after wake-up signal Swk respectively with signal Srs1, Srs2.But, also can after having sent a wake-up signal Swk, send two mensuration continuously with signal Srs1, Srs2.In addition, also can omit wake-up signal Swk.
In the above-described embodiment, RSSI information is comprised among the response signal Sre and sends.But, also can separate with response signal, send the RSSI information signal that only comprises RSSI information.In addition, also can the RSSI packets of information be contained among the answer signal Sac.
In the above-described embodiment, 2 mensuration have been sent with signal Srs1, Srs2.But,, also can send to measure more than 3 and use signal as long as have a plurality of mensuration with signal.Whether in this case, measure poor with RSSI of signals according to each, can judge rightly has been to use the improper communication of repeater.
In the above-described embodiment, be provided with outer sending part 22 of car and Che Nei sending part 23.But, shared sending part inside and outside the car also can be set.This sending part forms the sending zone in the car indoor and outdoor.
The processing of step S107 in the above-mentioned embodiment and step S108 can be carried out on the contrary.In this case, when being judged as the improper communication that has been to use repeater, do not carry out response check and ID code check, finish this process flow diagram.
In the above-described embodiment, send the wireless signal that LF is with, send the wireless signal of UHF band from electron key 10 from car-mounted device 20.But the frequency band that between car-mounted device 20 and electron key 10, sends the wireless signal that receives is not limited thereto.
In the above-described embodiment, as the car-mounted device 20 of controlling object through and electron key 10 between radio communication carry out the locking of car door, release etc.But controlling object is not limited to car-mounted device 20, also can be the door gear that for example is used for dwelling house.In this case, also can prevent to have used the improper communication of repeater with above-mentioned embodiment identically.
Claims (6)
1. an electron key system receives the control that wireless signal is carried out said controlling object through between controlling object and electron key, sending, it is characterized in that,
The different a plurality of wireless signals of the introversive at the fixed time said electron key strength of transmitted signals of said controlling object,
Said electron key system comprises:
Test section is set on the said electron key, detects from the signal intensity of each said wireless signal of said controlling object transmission; With
Judging part; Be set on said controlling object or the said electron key; When the difference of the signal intensity of each the said wireless signal that recognizes through said test section surpassed the difference preset threshold according to the signal intensity of each wireless signal of said transmission, judgement section judges allowed to carry out the control of said controlling object for not being to use the improper communication of repeater; And the difference of the signal intensity of each the said wireless signal that recognizes through said test section is when said threshold value is following; Judgement section judges is the improper communication that has been to use repeater, forbids carrying out the control of said controlling object
The said schedule time is configured to; Making the signal intensity of each said wireless signal become under the identical situation through repeater, follow said electron key in the said schedule time move and produce from the difference of the signal intensity of each wireless signal of said repeater below threshold value.
2. electron key system according to claim 1 is characterized in that,
The said schedule time is that the difference that the signal through will be corresponding with the signal intensity of each said wireless signal arrives distance is calculated divided by the user's of supposition maximum translational speed.
3. electron key system according to claim 1 and 2 is characterized in that,
Each said mensuration that said electron key will recognize through said test section is included in the signal strength information signal with the signal intensity of signal and sends,
Said judging part is set on the said controlling object, according to being included in each said mensuration in the said signal strength information signal with the signal intensity of signal, has judged whether to be to use the improper communication of repeater.
4. electron key system according to claim 3 is characterized in that,
Said signal strength information signal is the response signal that except the testing result of said test section, also comprises the intrinsic ID code of said electron key; Said controlling object is when receiving said response signal; Carry out the verification between ID code that comprises in the said response signal and the ID code of self storing in advance; When the verification of said ID code was set up, said judging part had judged whether to be to use the improper communication of repeater according to the testing result of the said test section that comprises in the said response signal.
5. an electron key system receives the control that wireless signal is carried out said controlling object through between controlling object and electron key, sending, it is characterized in that,
The different a plurality of wireless signals of the introversive at the fixed time said controlling object strength of transmitted signals of said electron key,
Said electron key system comprises:
Test section is set on the said controlling object, detects from the signal intensity of each said wireless signal of said electron key transmission; With
Judging part; Be set on said controlling object or the said electron key; When the difference of the signal intensity of each the said wireless signal that recognizes through said test section surpassed the difference preset threshold according to the signal intensity of each wireless signal of said transmission, judgement section judges allowed to carry out the control of said controlling object for not being to use the improper communication of repeater; And the difference of the signal intensity of each the said wireless signal that recognizes through said test section is when said threshold value is following; Judgement section judges is the improper communication that has been to use repeater, forbids carrying out the control of said controlling object
The said schedule time is configured to; Making the signal intensity of each said wireless signal become under the identical situation through repeater, follow said electron key in the said schedule time move and produce from the difference of the signal intensity of each wireless signal of said repeater below threshold value.
6. electron key system according to claim 5 is characterized in that,
The said schedule time is that the difference that the signal through will be corresponding with the signal intensity of each said wireless signal arrives distance is calculated divided by the user's of supposition maximum translational speed.
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| JP2011-004066 | 2011-01-12 | ||
| JP2011004066A JP5391211B2 (en) | 2011-01-12 | 2011-01-12 | Electronic key system |
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| CN102708605A true CN102708605A (en) | 2012-10-03 |
| CN102708605B CN102708605B (en) | 2016-02-10 |
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| CN201210021141.2A Active CN102708605B (en) | 2011-01-12 | 2012-01-09 | Electron key system |
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Also Published As
| Publication number | Publication date |
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| JP2012144905A (en) | 2012-08-02 |
| JP5391211B2 (en) | 2014-01-15 |
| CN102708605B (en) | 2016-02-10 |
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