CN104540692B - Wheel position detecting device and possess its tire pneumatic pressure detector - Google Patents

Abstract

In wheel position detecting device, the 1st control portion (23) of transmitter (2), when the angle of above-mentioned transmitter (2) reaches predetermined angular, sends the frame comprising intrinsic identification information repeatedly.2nd control portion (33) of receptor (3) receives the above-mentioned frame that sends from above-mentioned transmitter (2), specific above-mentioned frame is sent that the above-mentioned transmitter (2) come is installed in multiple wheel (5a～5d) which.Above-mentioned receptor (3) changes fluctuation permission amplitude whenever the pavement state that the above-mentioned frame of reception just represents according to the size concavo-convex with road surface, and rough road, compared with flat road surface, widely sets fluctuation permission amplitude.

Description

Wheel position detecting device and possess its tire pneumatic pressure detector

Association request cross-referenced

The disclosure is the Japanese publication numbering 2012-174138 proposed based on August 6th, 2012 Application, here quote its contents.

Technical field

It relates to detection object wheel is mounted in the wheel of the wheel of which position of vehicle Position detecting device and possess the tire pneumatic pressure detector of wheel position detecting device.

Background technology

In the past, as one of tire pneumatic pressure detector, there is the tire pressure detection dress of direct-type Put.In the tire pneumatic pressure detector of the type, the wheel side of tire is being installed, is directly pacifying Equipped with the transmitter possessing the sensors such as pressure transducer.It addition, at car body side, possess antenna with And receptor, if sending the detection signal from sensor from transmitter, then receptor is via antenna Receive this detection signal, carry out the detection of tire pressure.

In the tire pneumatic pressure detector of such direct-type, it is desirable to be able to differentiate and send the number of coming According to being whether the data of this vehicle and the transmitter transmitter that is mounted to which wheel.Therefore, In the data that transmitter sends, give respectively have for differentiate be this vehicle or other vehicles with And for differentiating the id information of the wheel being provided with transmitter.

It addition, the id information in order to be comprised according to transmission data comes the position of specific transmitter, Need to set up the id information of each transmitter with the position of each wheel associate and pre-register reception Device side.Therefore, when tire rotation, need the position by the id information of transmitter with wheel to close System re-registers to receptor.Motion has the technology that can automatically carry out this registration.

Specifically, in the device shown in patent documentation 1, transmitter based on wheel side is had The acceleration detection signal of standby acceleration transducer, detects wheel and is in the rotation position of regulation Put, and the rotation of the wheel when car body side also detects the wireless signal received from transmitter Position.And, by monitoring that the change of their relative angle comes specific wheel position.The party In method, the deviation of data based on ormal weight monitors the rotation position of the wheel detected in wheel side The change of the relative angle of the position of rotation of the wheel put and detect at car body side, and it is judged to phase Permissible value is exceeded for initial value fluctuation, thus specific wheel position.

Patent documentation 1: Japanese Unexamined Patent Publication 2010-122023 publication

But, in the case of carrying out wheel position detection as described in Patent Document 1, based on transmission The accuracy of detection of the position of rotation of the acceleration detection signal of device side changes according to pavement state.Example As, laying, flat road surface precision as road is good, in rough road precision as gravel road It is deteriorated.Corresponding to this, if when being carried out wheel position detection by the receptor of car body side, in conjunction with flat Smooth road surface and will judge that the permissible value of fluctuation used is set as narrower scope, then on coarse road Face becomes to carry out wheel position detection when travelling.On the contrary, if combining rough road and being set as Wider scope, then the time detected at the wheel position of flat road surface is the most elongated.

Summary of the invention

The disclosure is in view of above-mentioned point, it is therefore intended that provides and can quickly carry out wheel position in flat road surface Put detection, and also be able to carry out exactly the wheel position inspection of wheel position detection in rough road Survey device and possess the tire pneumatic pressure detector of wheel position detecting device.

The wheel position detecting device involved by one mode of the disclosure is applied to installing car body Possess the vehicle of the multiple wheels of tire, possess transmitters and receivers.Above-mentioned transmitter is respectively It is arranged at above-mentioned multiple wheel, has and create and send the of the frame containing intrinsic identification information 1 control portion.Above-mentioned receptor is arranged at above-mentioned car body side, has a 2nd control portion, and the above-mentioned 2nd Control portion carries out wheel position detection, in above-mentioned wheel position detects, receives via reception antenna The above-mentioned frame sent from above-mentioned transmitter, thus the specific above-mentioned transmitter quilt that the transmission of above-mentioned frame is come Be installed in above-mentioned multiple wheel which, and by above-mentioned multiple wheels with to be respectively arranged at this many The identification information of the above-mentioned transmitter of individual wheel is set up corresponding and stores.

Above-mentioned transmitter has the acceleration transducer of the output detection signal corresponding with acceleration, The acceleration of gravity that this acceleration comprises the rotation with the wheel being provided with this transmitter and changes Component.

Above-mentioned 1st control portion, and should centered by the central shaft of the wheel being provided with this transmitter The optional position of the circumferencial direction of wheel is set to angle 0 degree, inspection based on above-mentioned acceleration transducer Survey the gravitational acceleration component that comprised of signal to detect the angle of above-mentioned transmitter, and at this angle Degree becomes moment of predetermined angular and repeatedly sends above-mentioned frame.

The above-mentioned 2nd control portion car by corresponding detection signal based on output with the tooth of gear The detection signal of wheel speed sensor, obtains the gear information of the tooth position representing said gear, And the above-mentioned tooth position during time of reception based on above-mentioned frame sets fluctuation permission amplitude, if Above-mentioned tooth position when setting the time of reception of the above-mentioned frame after this fluctuation permission amplitude is above-mentioned Outside the scope of fluctuation permission amplitude, then from the candidate of the wheel being provided with the transmitter that have sent this frame Middle removing, and remaining wheel is entered as the wheel being provided with the transmitter that have sent above-mentioned frame Row registration, said gear and above-mentioned multiple wheel interlinked rotations.

Above-mentioned 2nd control portion is whenever receiving the road that above-mentioned frame just represents according to the size concavo-convex with road surface Surface state changes above-mentioned fluctuation and allows amplitude, and rough road, compared with flat road surface, widely sets Standing wave moves permission amplitude.

In above-mentioned wheel position detecting device, it is set for wheel position inspection according to pavement state Fluctuation during survey allows amplitude.Specifically, in flat road surface, narrowly set fluctuation and allow width Degree, in rough road, widely sets fluctuation permission amplitude.Thus, when flat road surface travels Amplitude can be allowed to carry out wheel position detection, it is possible to carry out more quickly with narrower fluctuation Wheel position detects.It addition, allow amplitude to carry out car when rough road travels with wider fluctuation The detection of wheel position, also thus is able to carry out exactly wheel position detection in rough road.

Tire pneumatic pressure detector involved by the alternate manner of the disclosure, comprises above-mentioned wheel position Detection device.Above-mentioned transmitter possesses sensing detection portion, and the output of this sensing detection portion is multiple with above-mentioned The detection signal that the air pressure of the above-mentioned tire that wheel possesses respectively is corresponding, will be by the above-mentioned 1st Control portion above-mentioned sensing detection portion is detected signal carry out after signal processing with tire pressure phase The information closed stores to frame, sends the frame to above-mentioned receptor.Above-mentioned receptor is by above-mentioned 2nd control portion, according to the information relevant to this tire pressure, detects above-mentioned multiple wheel and has respectively The air pressure of standby above-mentioned tire.

Accompanying drawing explanation

With reference to following accompanying drawing, and according to further detail below, above-mentioned in the disclosure or Other purpose, structure, advantage become more fully apparent.In the accompanying drawings,

Fig. 1 is the wheel position detecting device in the 1st embodiment representing and applying the disclosure The integrally-built figure of tire pneumatic pressure detector.

Fig. 2 A is the block diagram of the structure representing transmitter.

Fig. 2 B is the block diagram of the structure representing TPMS-ECU.

Fig. 3 A is to represent the relation between the angle of transmitter and the value of gravitational acceleration component Figure.

Fig. 3 B is the figure of the angle representing the transmitter at each wheel.

Fig. 4 is for the time diagram that wheel position detects is described.

Fig. 5 is the image of the change representing gear information.

Fig. 6 A is for illustrating that wheel position determines the figure of logic.

Fig. 6 B is for illustrating that wheel position determines the figure of logic.

Fig. 6 C is for illustrating that wheel position determines the figure of logic.

Fig. 7 A is to represent that including ID1 is used as the evaluation of the wheel position in the frame of identification information The figure of result.

Fig. 7 B is to represent that including ID2 is used as the evaluation of the wheel position in the frame of identification information The figure of result.

Fig. 7 C is to represent that including ID3 is used as the evaluation of the wheel position in the frame of identification information The figure of result.

Fig. 7 D is to represent that including ID4 is used as the evaluation of the wheel position in the frame of identification information The figure of result.

Fig. 8 A is the detection signal representing the acceleration transducer in the traveling such as flat road surface of laying road The oscillogram of the change of the value of the gravitational acceleration component comprised.

Fig. 8 B is the detection signal representing the acceleration transducer in the rough road travelings such as gravel road The oscillogram of the change of the value of the gravitational acceleration component comprised.

Fig. 9 A is to represent the angle to the transmitter at the delivery time laid when road has carried out frame transmission The fluctuation of degree investigate after the figure of result of gained.

Fig. 9 B is the angle representing the transmitter to the delivery time carried out when frame sends at gravel road The fluctuation of degree investigate after the figure of result of gained.

Figure 10 is the flow chart representing data sending processing.

Figure 11 is to represent to extract from the detection signal of the acceleration transducer at gravel road to be superimposed with The oscillogram of the situation during weight component of noise.

Figure 12 is the figure of the example representing frame structure.

Detailed description of the invention

Hereinafter, illustrate based on accompanying drawing embodiment of this disclosure.Wherein, following each reality Execute mode each other, to the most identical or part of equivalent, mark identical label and illustrate.

(the 1st embodiment)

1st embodiment of this disclosure illustrates referring to the drawings.First, with reference to Fig. 1, right The tire pressure detection applying the wheel position detecting device in the 1st embodiment of the disclosure fills The overall structure put illustrates.Additionally, consistent with the front of vehicle 1 above the paper of Fig. 1, Below paper consistent with the rear of vehicle 1.

As it is shown in figure 1, tire pneumatic pressure detector is installed on vehicle 1, possesses transmitter 2, send out Wave the tire pneumatic pressure detector ECU (electronic control unit) of the effect of receptor (below, Be referred to as TPMS-ECU) 3 and instrument 4 and constitute.Wheel position detecting device uses tire The transmitter 2 and TPMS-ECU3 that pressure test device is possessed, and from control for brake Basis and each wheel 5 (5a～5d) is obtained with in ECU (hereinafter referred to as braking ECU) 10 The detection signal of vehicle-wheel speed sensor 11a～11d possessed accordingly and the gear information that obtains, Thus carry out the specific of wheel position.

As it is shown in figure 1, transmitter 2 is installed on each wheel 5a～5d, detection be installed on wheel 5a～ The air pressure of the tire of 5d, and would indicate that the information storage relevant to tire pressure of this testing result Deposit to frame and be transmitted.TPMS-ECU3 is installed on car body 6 side of vehicle 1, receives The frame sent from transmitter 2, and enter based on detection signal stored in the time of reception, frame Row various process, computing etc., thus carry out wheel position detection and tire pressure detection.Send Device 2 such as creates frame by frequency shift keying (FSK), and TPMS-ECU3 is by entering this frame Row demodulates thus reads the data in frame, and carries out wheel position detection and tire pressure detection. About the detailed construction of these transmitters 2 and TPMS-ECU3, with reference to Fig. 2 A and figure 2B illustrates.

As shown in Figure 2 A, transmitter 2 possesses sensing detection portion 21, acceleration transducer 22, micro- Type computer 23, transtation mission circuit 24 and transmission antenna 25 and constitute, based on from not shown The power supply of battery drives each portion.

Sensing detection portion 21 such as possesses the pressure transducer 21a of diaphragm type, temperature sensor 21b And constitute, export the detection signal that the detection signal corresponding with tire pressure is corresponding with temperature. Acceleration transducer 22 is for carrying out being provided with the sensor at wheel 5a～5d of transmitter 2 The position detection of self, in other words for being transmitted the position detection of device 2, Bus-Speed Monitoring. The acceleration transducer 22 of present embodiment such as exports and acts on when the rotation of wheel 5a～5d In the acceleration of wheel 5a～5d, the radial direction of each wheel 5a～5d, i.e. vertical with circumferencial direction The corresponding detection signal of the acceleration in two directions.

Microcomputer 23 is the known parts possessing control portion (the 1st control portion) etc., root The program stored according to the memorizer in control portion, performs the process of regulation.Storage in control portion Device stores and comprises for the intrinsic identification information of the transmitter of specific each transmitter 2 with for specific Each id information of the identification information that the vehicle of this vehicle is intrinsic.

Microcomputer 23 accepts the detection letter relevant to tire pressure from sensing detection portion 21 Number, it is carried out signal processing and is processed as required, this is relevant to tire pressure Information is stored in frame together with the id information of each transmitter 2.It addition, microcomputer 23 is supervised The detection signal of apparent acceleration sensor 22, carry out be provided with each transmitter 2 wheel 5a～ The position detection of the transmitter 2 at 5d, or carry out Bus-Speed Monitoring.And, microcomputer If 23 create frame, the then result of position based on transmitter 2 detection, the result of Bus-Speed Monitoring, warp Frame transmission (data are carried out by transmission antenna 25 towards TPMS-ECU3 by transtation mission circuit 24 Send).

Specifically, microcomputer 23 sends as condition start frame under steam using vehicle 1, When to the delivery time specified, frame is repeated send.Such as, microcomputer 23 based on The detection signal of acceleration transducer 22 is at the angle of the transmitter 2 being provided with acceleration transducer 22 The moment of the transmission angle that degree becomes regulation carries out frame transmission.And, microcomputer 23 is being sent out The moment of the transmission angle that the angle sending device 2 becomes regulation is repeated this frame and sends.

For under steam, result based on Bus-Speed Monitoring judges, for the angle of transmitter 2, The result of the position detection of transmitter 2 based on the detection signal according to acceleration transducer 22 is come Judge.That is, in microcomputer 23, the detection signal of acceleration transducer 22 is utilized to enter Row Bus-Speed Monitoring, if speed becomes more than fixing speed (such as 5km/h), is judged to vehicle 1 under steam.The output of acceleration transducer 22 comprises acceleration based on centrifugal force (centrifugal Acceleration).By this centrifugal acceleration being integrated and being multiplied by coefficient, it is possible to calculate speed.

Further, since exported corresponding with the rotation of each wheel 5a～5d by acceleration transducer 22 Detection signal, so in motion, this detection signal packet contains gravitational acceleration component, becomes tool There is the signal rotating corresponding amplitude with wheel.Such as, as shown in Figure 3A, for detection letter Number amplitude for, centered by the central shaft by wheel 5a～5d, transmitter 2 is above It is negative peak swing during position, is zero when transmitter 2 is horizontally situated, at transmitter 2 It is positive peak swing when being positioned at lower position.Therefore, it is possible to be provided with based on this amplitude The position detection of the transmitter 2 of acceleration transducer 22, it is possible to the angle of detection transmitter 2. Such as, as shown in Figure 3 B, centered by the central shaft of each wheel 5a～5d, it is possible to be held in by As the angle of the transmitter 2 when 0 degree during transmitter 2 position above.And, such as Fig. 3 A Shown in, set up between angle and the value of gravitational acceleration component of transmitter 2 and have corresponding relation, institute The angle of transmitter 2 it is capable of detecting when with value based on gravitational acceleration component.

Thus it is for example possible to it is fast while reaching fixing speed with speed or to reach regulation in speed When after degree, the angle of transmitter 2 becomes the transmission angle of regulation, as start time, carry out coming Send from the frame of each transmitter 2.Afterwards, it is possible to the angle at transmitter 2 becomes transmission angle Moment is repeated frame and sends.Wherein, for delivery time, gravitational acceleration component can be set to Every 1 cycle of amplitude cycle of value, but in view of battery life, it is impossible to by this cycle one each Straight row frame sends, and the most preferably carries out in the ratio of each specified period (such as 15 seconds) 1 time Frame sends.Transtation mission circuit 24 realizes the frame sent from microcomputer 23 is passed through transmission antenna 25 functions as output unit sent towards TPMS-ECU3.Frame sends and such as uses RF The electric wave of (radio frequency) frequency band.

The air note that the transmitter 2 so constituted such as is installed on the wheel hub of each wheel 5a～5d Entering valve, sensing detection portion 21 configures in the way of exposing to the inner side of tire.And, detect phase Corresponding tire pressure, if as it has been described above, speed exceedes fixing speed, then transmitter 2 is sending Iterate through the transmission antenna 25 that each transmitter 2 possessed during the moment and carry out frame transmission.Afterwards, It also is able to carry out frame transmission at the delivery time set as described above, but in view of battery life, Extend and send interval preferably.Therefore, if through supposing the wheel position specific required time, then Determine that pattern is switched to regular sending mode from wheel position, by each longer fixed cycle (example Such as every 1 minute) carry out frame transmission, thus periodically send to TPMS-ECU3 side and take turns nausea The signal that pressure is relevant.Now, such as each transmitter 2 is arranged random delay such that it is able to make The delivery time of each transmitter 2 staggers such that it is able to prevent due to the electricity from multiple transmitters 2 The interference of ripple and can not receive in TPMS-ECU3 side.

It addition, as shown in Figure 2 B, TPMS-ECU3 is for possessing reception antenna 31, receiving electricity The structure of road 32 and microcomputer 33 etc..TPMS-ECU3 passes through CAN (controller LAN) wait for bus interior LAN (LAN), obtains tooth from braking ECU10 as described later Wheel information, thus obtain number of edges with the tooth of the gear rotated together with each wheel 5a～5d (or The number of teeth) the tooth position that represents.

Reception antenna 31 is for receiving the frame sent from each transmitter 2.Reception antenna 31 is fixed on Car body 6, it is also possible to the inside antenna being disposed in the main body of TPMS-ECU3, it is also possible to It it is the exterior antenna extending wiring from main body.

Receive circuit 32 and realize entering through that reception antenna 31 receives from each transmitter 2 Send frame, and send the frame to the function as input unit of microcomputer 33.Receive electricity If road 32 receives signal (frame) by reception antenna 31, then the signal that this receives is sent to Microcomputer 33.

Microcomputer 33 is equivalent to the 2nd control portion, according to the memorizer in microcomputer 33 The program stored performs wheel position detection and processes.Specifically, microcomputer 33 based on When the information obtained from braking ECU10 and the reception sending frame received from each transmitter 2 Relation between quarter carries out wheel position detection.Microcomputer 33 is by each specified period (example Such as 10ms) obtain, from braking ECU10, the wheel velocity possessed accordingly with each wheel 5a～5d The gear information of sensor 11a～11d.

Gear information refers to represent the tooth position of the gear (gear) rotated together with each wheel 5a～5d The information put.Vehicle-wheel speed sensor 11a～11d is such as by the electricity arranged opposite with the tooth of gear Magnetic pickup (Electromagnetic pickup) formula sensor is constituted, along with tooth logical of gear Cross and make change in detection signal.In such vehicle-wheel speed sensor 11a～11d, as Detection signal output and tooth by corresponding square pulse ripple, the rising edge of this square impulse wave with And trailing edge represents the passing through of edge of tooth of gear.Therefore, in braking ECU10, according to The rising edge of the detection signal of vehicle-wheel speed sensor 11a～11d and the individual counting number of trailing edge The number of edges of the tooth of gear, i.e. edge by number, by each specified period, by tooth now Number of edges is sent to microcomputer 33 as the gear information representing tooth position.Thus, miniature In computer 33, it is possible to assurance is the moment which tooth of gear passes through.

The number of edges of tooth rotates a circle by every gear and is reset.Such as, the tooth possessed at gear In the case of quantity is 48 teeth, number of edges with 0～95 totally 96 count, if count value reaches Again return to 0 to 95 count.

Wherein, here, from braking ECU10 using the number of edges of the tooth of gear as gear information It is sent to microcomputer 33 but it also may be the number of teeth of the count value by number as tooth.Separately Outward, it is also possible to the number of edges passed through during specified period or the number of teeth are sent to microcomputer 33, by the number of edges passed through during specified period or the number of teeth with previous in microcomputer 33 Number of edges or the number of teeth till secondary are added, and count the number of edges in this cycle or the number of teeth.In other words, As long as the number of edges in this cycle or the number of teeth finally can be obtained in microcomputer 33 as gear Information.It addition, in braking ECU10, whenever power supply disconnects just limit to the tooth of gear Edge number (or number of teeth) resets but it also may with while power on or in power on After when reaching regulation speed, remeasure.Such that make just to be reset whenever power supply disconnects, During power supply disconnects, identical tooth is also represented by identical number of edges (or number of teeth).

If microcomputer 33 receives the frame sent from each transmitter 2, measure this time of reception, The limit of gear during time of reception of the frame in number of edges based on acquired gear (or number of teeth) Edge number (or number of teeth) carries out wheel position detection.So, based on the time of reception and gear information Represented tooth position, carries out specific each transmitter 2 is installed in which wheel 5a's～5d Wheel position detects.The concrete grammar detected about this wheel position, discussed in detail below.

It addition, the result that microcomputer 33 detects based on wheel position, by each transmitter 2 Id information is set up with the position of each wheel 5a～5d being provided with each transmitter 2 and is associated and deposit Storage.And, afterwards based on from each transmitter 2 send id information stored in frame and The data relevant to tire pressure, carry out the tire pressure detection of each wheel 5a～5d, will be with wheel The corresponding signal of telecommunication of air pressure is exported to instrument 4 by the CAN interior LAN that waits for bus.Such as, micro- Type computer 33 by being compared to detection tire pressure by threshold value Th of tire pressure Yu regulation Reduction, if detecting the reduction of tire pressure, the signal of this purport is exported to instrument 4.By This, which tire pressure in 4 wheel 5a～5d reduces this situation and is transferred into instrument Table 4.

Instrument 4 plays a role as alarm portion, can vision as it is shown in figure 1, be arranged in driver The position confirmed, such as, be made up of the instrument display etc. in the instrument board being arranged on vehicle 1.Example If the microcomputer from TPMS-ECU3 33 is sent represents what tire pressure reduced The signal of purport, then this instrument 4 specific wheel 5a～5d and be indicated the fall of tire pressure Low display, thus the reduction of the tire pressure to Pilot Report's specific wheel.

Then, the action to the tire pneumatic pressure detector of present embodiment illustrates.Hereinafter, Action to tire pneumatic pressure detector illustrates, but to carrying out at tire pneumatic pressure detector Wheel position detection and tire pressure detection separately illustrate.

First, wheel position detection is illustrated.Initially, reference Fig. 4～Fig. 7 D, to will not The method of the basic wheel position detection that pavement state is taken into account illustrates.As Wei Jiang road The situation that surface state is taken into account, if the angle of transmitter 2 becomes the transmission angle of regulation, enters Row frame sends, and it is received by receptor 3, and the situation thus carrying out wheel position detection is carried out Illustrate, but can suitably change for delivery time.

In transmitter 2 side, microcomputer 23 presses each rule based on the power supply from battery The fixed sampling period monitors the detection signal of acceleration transducer 22, thus detection speed and car The angle of the transmitter 2 of wheel 5a～5d.And, if speed reaches fixing speed, then microcomputer Calculation machine 23 angle of transmitter 2 is become send angle moment as delivery time, repeatedly enter Row frame sends.

That is, if extracting the gravitational acceleration component of the detection signal of acceleration transducer 22, then become For the sin ripple (sinusoidal wave) shown in Fig. 3 A.The angle of transmitter 2 is understood based on this sin ripple. Therefore, detect that transmitter 2 becomes transmission angle based on sin ripple, carry out frame transmission.

On the other hand, in TPMS-ECU3 side, by each specified period (such as 10ms) from Braking ECU10 obtain the vehicle-wheel speed sensor 11a possessed accordingly with each wheel 5a～5d～ The gear information of 11d.And, TPMS-ECU3 is receiving from the transmission of each transmitter 2 This time of reception is measured, getting frame from the number of edges (or number of teeth) of acquired gear during frame The number of edges (or number of teeth) of the gear during time of reception.

Now, it is not limited to from the time of reception of the frame of each transmitter 2 transmission and from braking The cycle that ECU10 obtains gear information is consistent.Therefore, it is possible to will obtain from braking ECU10 The gear information that cycle closest to the time of reception of frame in the cycle of gear information gets The number of edges (or number of teeth) of represented gear, as the edge of gear during time of reception of frame Number (or number of teeth) uses.When cycle closest to the time of reception mentioned here can be to receive Carve tight before or tight after any one of cycle.Alternatively, it is also possible to use from braking Before the time of reception of the frame in the cycle that ECU10 obtains gear information is tight and tight after The number of edges (or number of teeth) of the gear represented by gear information that the cycle gets, carrys out computing frame The number of edges (or number of teeth) of the gear during time of reception.For instance, it is possible to by the time of reception at frame Before tight and tight after the gear represented by gear information that gets of cycle number of edges (or The number of teeth) intermediate value, the number of edges (or number of teeth) as gear during time of reception of frame makes With.

And, the number of edges (or number of teeth) of gear during time of reception of such getting frame dynamic Make, just repeat by whenever reception frame, and based on the tooth during time of reception of the frame got The number of edges (or number of teeth) of wheel carries out wheel position detection.Specifically, by judging frame Whether the fluctuation of the number of edges (or number of teeth) of the gear during time of reception is based on previous reception The number of edges (or number of teeth) of the gear during moment and in the prescribed limit that sets, carry out wheel position Put detection.

For receiving the wheel of frame, the angle at transmitter 2 becomes the moment sending angle from sending out Device 2 is sent to carry out frame transmission.Therefore, in the case of transmission angle is equal angular, with connecing of frame The tooth position that the number of edges (or number of teeth) of the gear when time receiving carves represents is the most consistent with when first one time. Therefore, the fluctuation of the number of edges (or number of teeth) of gear during time of reception of frame is less, is converged in In prescribed limit.This phenomenon is also set up in the case of repeatedly receiving frame, the time of reception of each frame Time the fluctuation of number of edges (or number of teeth) of gear determined when being converged in primary frame time of reception In fixed prescribed limit.On the other hand, for the wheel different from the wheel receiving frame, with from The number of edges (or number of teeth) of gear during time of reception of the frame that the transmitter 2 of other wheel sends The tooth shift in position represented.

That is, the rotation of the gear of vehicle-wheel speed sensor 11a～11d interlocks with each wheel 5a～5d, So for the wheel receiving frame, by the number of edges (or number of teeth) of gear during time of reception of frame The tooth position represented is the most consistent.But, because of each wheels such as condition of road surface, rotation or lane changings The rotation status variation of 5a～5d, so the rotation status of wheel 5a～5d can not be identical. Therefore, for the wheel different from the wheel receiving frame, with gear during time of reception of frame The tooth shift in position that number of edges (or number of teeth) represents.

Therefore, as it is shown in figure 5, for the wheel different from the wheel receiving frame, open from igniting Close (IG) connect the number of edges of initial gear 12a of (ON)～12d be 0 state rise, Tooth position when starting running the rear time of reception gently produces fluctuation.By whether judging this fluctuation In prescribed limit, it is possible to carry out wheel position detection.

Such as, as shown in Figure 6A, if the position of transmitter 2 when primary frame sends is the Receiving angle.It addition, be provided as the fluctuation of the number of edges (or number of teeth) for gear and can permit Amplitude that is the fluctuation permission amplitude permitted are and the model of 180 degree centered by first time receiving angle Enclose the value that (scope of receiving angle ± 90 degree for the first time) is suitable.If it is with that number of edges then sets Centered by number of edges when once receiving ± the number of edges scope of 24, if it is with that the number of teeth then sets Centered by number of teeth when once receiving ± range of numbers of teeth of 12.In this case, such as Fig. 6 B Shown in, if the number of edges (or number of teeth) of gear when secondary frame receives is by primary frame Receive in the range of the fluctuation permission amplitude determined, then this wheel has and has carried out what frame sent The probability that wheel is consistent.In the case of Gai, it is determined that result is TRUE (correctly).

But, in this case, the angle of the transmitter 2 when also receiving with secondary frame is also I.e. second time receiving angle centered by determine fluctuation permission amplitude, its be with second time receiving angle Centered by 180 degree (± 90 degree) suitable value.Therefore, become previous fluctuation and allow width Degree centered by first time receiving angle 180 degree (± 90 degree) fluctuation permission amplitude and The overlap of the fluctuation permission amplitude of 180 degree (± 90 degree) centered by second time receiving angle Part allows amplitude (number of edges scope is 12～48) for new fluctuation.Energy in this repetition scope New fluctuation is enough made to allow amplitude to narrow.

Therefore, as shown in Figure 6 C, if number of edges (or the tooth of the gear when frame of third time receives Number) outside the scope being received the fluctuation permission amplitude determined by first time, secondary frame, then This wheel is inconsistent with the wheel having carried out frame transmission.Therefore, it is determined that result is that FALSE is (wrong By mistake).Now, even if being received in the range of the fluctuation permission amplitude determined by primary frame, If outside the scope being received the fluctuation permission amplitude determined by first time, secondary frame, the most also It is judged to FALSE.Like this, it is possible to specific transmitter 2 quilt that have sent received frame Be installed in wheel 5a～5d which.

I.e., as shown in Figure 7 A, it is used as the frame of identification information for including ID1, by each Obtain the number of edges (or number of teeth) of gear the time of reception of this frame, and by the wheel of each correspondence (the near front wheel FL, off-front wheel FR, left rear wheel RL, off hind wheel RR) stores the limit of gear Edge number (or number of teeth).And, whenever receive frame, decide that the gear got number of edges (or The number of teeth) whether in the range of fluctuation permission amplitude, by the wheel that deviate from from this scope from installation Have in the wheel candidate of the transmitter 2 that have sent frame and remove.Then, will to the last not be removed Wheel register as the wheel being provided with the transmitter 2 that have sent frame.Including In the case of the frame of ID1, off-front wheel FR, off hind wheel RR, left rear wheel RL depend on according to this order Secondary by removing from candidate, final remaining the near front wheel FL is as being provided with the transmission that have sent frame The wheel of device 2 and be registered.

And, as shown in Fig. 7 B～Fig. 7 D, it is used as identifying letter for including ID2～ID4 The frame of breath, is also carried out the process identical with the frame including ID1.It is provided with thereby, it is possible to specific Have sent the wheel of the transmitter 2 of each frame, it is possible to specific all 4 wheels being mounted with transmitter 2.

So, specific each frame be installed in wheel 5a～5d which.Then, miniature calculating Transmission is carried out the id information of each transmitter 2 of frame and the wheel being provided with this transmitter 2 by machine 33 Position is set up association and stores.Thereby, it is possible to carry out wheel position detection.

Wherein, in TPMS-ECU3, reception speed sends out when becoming fixing speed Frame, stores the gear information of this time of reception, if but becoming the traveling stopping judgement speed per hour (example of regulation Such as 5km/h) below, then abandon gear information so far.And, starting again at row When sailing, again it is made as above wheel position detection.

According to above such method, it is possible to carry out wheel position detection.But, based on acceleration The precision of the angle detection of the transmitter 2 of the detection signal of sensor 22 changes according to pavement state Become.Such as, on concavo-convex less and smooth road surface, road surface as laid road, precision is higher, The concavo-convex bigger and coarse road surface on road surface as gravel road, precision is poor.Correspondingly, In the case of carrying out wheel position detection according to method as described above, if by fluctuation permission amplitude Setting combine flat road surface and be set as narrower scope, then can not carry out when rough road travels Wheel position detects.On the contrary, if combining rough road to be set as wider scope, then on smooth road The time of the wheel position detection in face is the most elongated.

Therefore, in the present embodiment, it is possible to set fluctuation permission amplitude according to pavement state. Specifically, the detection signal of acceleration transducer 22 is laying the flat road surface noise component(s)s such as road Less, as shown in Figure 8 A, when extracting gravitational acceleration component, as ± 1G data not The smooth sin ripple of distortion is extracted.Therefore, less at flat road surface effect of noise, so The angle accuracy of detection of transmitter 2 raises, and the fluctuation of the delivery time of frame is the most less.Such as, exist When the position of the positive peak swing of sin ripple is set to send angle, it is possible to precision detects higher The angle of transmitter 2, so carrying out frame transmission exactly in this position.Therefore, even if narrowly Set fluctuation permission amplitude and also be able to carry out exactly wheel position detection.

On the other hand, will be in rough road as gravel road, because road surface is concavo-convex, tire is subject to Collimeter be shown as noise component(s), as shown in Figure 8 B, extract gravitational acceleration component time, It is superimposed with noise in the data of ± 1G, does not becomes smooth sin ripple.Therefore, make an uproar in rough road The impact of sound is relatively big, so the angle accuracy of detection of transmitter 2 reduces, and the ripple of the delivery time of frame Dynamic increase.Such as, when the position of the positive peak swing of sin ripple is set to send angle, no The angle of transmitter 2 can be detected accurately, send out so frame can not be carried out exactly in this position Send.Therefore, if the most widely setting fluctuation permission amplitude, it is likely that car can not be carried out exactly The detection of wheel position.

Therefore, narrowly set fluctuation permission amplitude in flat road surface, widely set in rough road Standing wave moves permission amplitude.So, when flat road surface travels, it is possible to allow width with narrower fluctuation Degree carries out wheel position detection, it is possible to carry out wheel position detection more quickly.It addition, When rough road travels, amplitude is allowed to carry out wheel position detection with wider fluctuation, thus slightly Rough road surface also is able to carry out exactly wheel position detection.

Such as, in order to lay, to as flat road surface, the fluctuation permission amplitude that road setting is suitable, right Angle (sending angle) and its frequency of the transmitter 2 when laying road and having carried out frame transmission are entered Go investigation.Equally, in order to the gravel road as rough road being set suitable fluctuation permission width Degree, to the angle (sending angle) of transmitter 2 carried out at gravel road when frame sends and its Frequency is investigated.Specifically, it is assumed to the position of the positive peak swing of sin ripple send out Send angle (the most such as a example by 180 degree) to carry out repeatedly frame to send, the actual frame that carried out is sent out The angle of the transmitter 2 when sending is investigated.As a result of which it is, as shown in Figure 9 A, laying Road, has carried out frame transmission, such as Fig. 9 B centered by 180 degree and in the range of tolerance+45 degree Shown in, at gravel road, centered by 180 degree and in the range of ± 75 degree, carry out frame transmission. It is thus possible, for instance in flat road surface, it is possible to it is to send angle ± 45 degree that fluctuation allows amplitude set, In rough road, it is possible to fluctuation allows amplitude set for sending angle ± 75 degree.

Specifically, in the present embodiment, the detection of pavement state is carried out in transmitter 2 side, When the data sending processing shown in the flow chart performing Figure 10 carries out frame transmission, examine the most simultaneously Survey pavement state, frame also comprises the Data Concurrent relevant to pavement state and send.Data are sent out Send process, the microcomputer 23 of transmitter 2 perform by the control cycle of each regulation.

First, determine whether in traveling in S100.In travelling, based on Bus-Speed Monitoring Result judge, if speed is more than fixing speed (such as 5km/h), be then judged to car 1 is to travel.And, if it is determined that for then entering S110 in travelling.

In S110, detect the angle of transmitter 2 and detect pavement state.For transmitter 2 Angle, detection signal based on acceleration transducer 22 detects.Acceleration transducer 22 The value of the gravitational acceleration component of detection signal is depicted as sin ripple, so according to being positioned at sin ripple Which position, detects the angle of the transmitter 2 in this moment.For pavement state, also based on adding The detection signal of velocity sensor 22 detects.The detection signal of acceleration transducer 22 is comprised Gravitational acceleration component be substantially depicted as sin ripple, but according to pavement state on sin ripple folded Added with noise.Therefore, the maximum of the value of the noisy gravitational acceleration component of computing superposition with The difference Δ G of little value, and whether exceed the threshold value (such as 5G) of regulation based on this difference Δ G and sentence Other rough road and flat road surface.Such as, as shown in figure 11, on road coarse as gravel road In the case of face, be superimposed with noise thus the maxima and minima of the value of gravitational acceleration component it Difference Δ G increases, and difference Δ G exceedes threshold value.Therefore, by by noisy for superposition acceleration of gravity The difference Δ G of the maxima and minima of the value of component compares with threshold value, it is possible to detection road surface shape State.

Afterwards, S120 is entered, when becoming the delivery time of regulation, such as at transmitter 2 Angle becomes the moment of the transmission angle of regulation, carries out frame transmission.Now, in order to The testing result of the pavement state of transmitter 2 is held in TPMS-ECU3 side, by this testing result It is included in frame.Such as, frame assumption diagram as shown in figure 12 is such, except id information, air pressure And beyond temperature information, also include the angle representing the transmitter 2 changed according to pavement state Precision angle precision information, i.e. represent the information of pavement state.

So, if data sending processing completes, and send the frame including various data, then exist TPMS-ECU3 side joint receives this frame, carries out wheel position detection according to said method.Now, In TPMS-ECU3, set fluctuation permission amplitude according to pavement state.Specifically, TPMS-ECU3 based on represented by the angle precision information included in frame at transmitter 2 The testing result of pavement state sets fluctuation permission amplitude.That is, for TPMS-ECU3 Speech, if the testing result of road surface evenness, then allows amplitude set for having carried out frame reception fluctuation Time the scope of receiving angle ± 45 degree, if the testing result that road surface is coarse, then fluctuation is allowed Amplitude set is the scope having carried out receiving angle ± 75 degree when frame receives.Thereby, it is possible to based on The fluctuating margin corresponding with pavement state carries out wheel position detection.

If carrying out wheel position detection like this, then after, carry out tire pressure detection.Concrete and Speech, when tire pressure detects, sends frame, Mei Dangcong by each fixed cycle from each transmitter 2 Each transmitter 2 sends frame, receives 4 frames taking turns part at TPMS-ECU3.Then, at TPMS -ECU3, coming specific based on id information stored in each frame is from being installed on wheel 5a～5d The frame that sends of which transmitter 2, detect each wheel according to the information relevant to tire pressure The tire pressure of 5a～5d.Thereby, it is possible to detect the fall of the tire pressure of each wheel 5a～5d Low, it is possible to which the tire pressure in specific wheel 5a～5d reduces.And, if detection Go out the reduction of tire pressure, then this purport is transferred to instrument 4, thus by the specific car of instrument 4 Wheel 5a～5d and be indicated the display of reduction of tire pressure, to the specific car of Pilot Report The reduction of the tire pressure of wheel.

As described above, in the present embodiment, it is set for car according to pavement state The fluctuation during detection of wheel position allows amplitude.Specifically, fluctuation is narrowly set in flat road surface Permission amplitude, widely sets fluctuation permission amplitude in rough road.Thus, at flat road surface row Amplitude can be allowed to carry out wheel position detection with narrower fluctuation when sailing, it is possible to more quickly Carry out wheel position detection.It addition, allow amplitude to enter when rough road travels with wider fluctuation Row wheel position detects, thus also is able to carry out exactly wheel position detection in rough road.Cause This, can be quickly carried out wheel position detection in flat road surface, and, also can in rough road Enough carry out wheel position detection exactly.

Further, the fluctuation of the tooth position during time of reception based on frame is allowed amplitude with front once The overlapping part of the fluctuation permission amplitude set by the time of reception of frame, be set as that new fluctuation is permitted Amplitude of being permitted.Therefore, it is possible in the range of new fluctuation allows amplitude narrow to these repetitions.Therefore, It is capable of carrying out exactly the specific wheel position detecting device of wheel position with the short period.

It addition, speed becomes the condition that more than fixing speed sends as frame, acceleration is used to pass Sensor 22 is transmitted detecting in the position of each wheel 5a～5d of device 2, so only at vehicle 1 Wheel position detection can be carried out after starting running, but also be able to after traveling carry out at once wheel Position is detected.Further, need not the receiving intensity etc. of signal as exported based on trigger carry out The situation of wheel position detection needs to use triggering machine etc. like that, it becomes possible to carry out wheel position inspection Survey.

(other embodiments)

In the above-described embodiment, detect pavement state in transmitter 2 side, but also be able at TPMS -ECU3 detects side.For instance, it is possible to detection based on vehicle-wheel speed sensor 11a～11d Signal detects pavement state.Specifically, it is possible to vehicle-wheel speed sensor 11a's～11d Detection signal carries out frequency resolution and extracts the vibration characteristics according to suspension fore-and-aft direction axle bush and determine (such as, fixed resonant frequency component, detect pavement state according to the vibration gain of this resonant frequency With reference to Japanese Unexamined Patent Publication 9-243345 publication).

It addition, in the above-described embodiment, pavement state is set as, and road surface is concavo-convex bigger and coarse Concavo-convex two kinds less and smooth of the road surface in road surface and road surface but it also may be periodically divided into two kinds More than set, and set fluctuation permission amplitude according to this stage.It addition, above-mentioned embodiment party Fluctuation shown in formula allows amplitude to be only an example, it is possible to suitable according to tire size, vehicle etc. Local change.

It addition, in the above-described embodiment, as carrying out the angle of frame transmission, it it is 0 degree by angle Position be set to centered by the central shaft of each wheel 5a～5d and acceleration transducer 22 is positioned at When orientation is put.But, this is only an example, is set to the optional position of the circumferencial direction of wheel Angle 0 degree.

It addition, in the above-described embodiment, whenever receiving frame just change fluctuation permission amplitude, ripple is made Dynamic permission amplitude gently narrows, but allows width about the fluctuation set centered by tooth position Degree, is the fixed value corresponding with pavement state.It also is able to the key factor beyond based on pavement state This fluctuation set centered by tooth position of change allows amplitude further.Such as, there is speed The probability that more fluctuation of canine tooth position more increases.Therefore, speed is the biggest more increases fluctuation permission width Degree such that it is able to set fluctuation permission amplitude more accurately.It addition, utilize acceleration transducer 22 degree of being accelerated detection time sampling period the longest, the accuracy of detection of the angle of transmitter 2 more under Fall, so change fluctuation permission amplitude correspondingly such that it is able to set ripple more accurately Dynamic permission amplitude.In this case, hold the sampling period etc. in transmitter 2 side, it is possible to The Data Concurrent comprising the size determining fluctuation permission amplitude in the frame that transmitter 2 is sent send.

In the above-described embodiment, TPMS-ECU3 obtains gear information from braking ECU10, Number of edges or the number of teeth of the tooth of TPMS-ECU3 acquisition gear are used as gear information.Cause This, it is also possible to obtain from other ECU, it is also possible to input vehicle-wheel speed sensor 11a～11d Detection signal, according to number of edges or the number of teeth of the tooth of this detection signal acquisition gear.Particularly, In the above-described embodiment, TPMS-ECU3 and braking ECU10 are constituted to discrete ECU Situation be illustrated but it also may be to be constituted their feelings by the single ECU of integration Condition.In this case, this ECU directly inputs the detection letter of vehicle-wheel speed sensor 11a～11d Number, and according to the number of edges of the tooth of this detection signal acquisition gear or the number of teeth.It addition, in this situation Under, it is possible to often obtain number of edges or the number of teeth of the tooth of gear, so obtaining with by each specified period The situation taking these information is different, it is possible to the gear information of the time of reception based on just frame is carried out Wheel position detects.

It addition, in the above-described embodiment, the vehicle 1 possessing 4 wheel 5a～5d is had Standby wheel position detecting device is illustrated, but vehicle more for wheel number, too The disclosure can be applied.

Additionally, in the disclosure, it is possible to detected and car by vehicle-wheel speed sensor 11a～11d Passing through of the tooth of the gear that the rotation of wheel 5a～5d rotates linkedly.Accordingly, as gear, Outer peripheral face is that the part magnetic resistance alternately repeated from the part between tooth of the tooth of conductor is different Construct.In other words, it is not only and peripheral portion is formed as concavo-convex thus outer peripheral face by becoming The protuberance of conductor and the general structure becoming idioelectric space composition, the most also comprise outer peripheral face By the part becoming conductor and become roller actuator that idioelectric insulator constitutes etc. (referring for example to Japanese Unexamined Patent Publication 10-048233 publication).

Claims (4)

1. a wheel position detecting device, it is applied to car body (6) is mounted with possess wheel The vehicle (1) of multiple wheels (5a～5d) of tire, described wheel position detecting device possesses:

Transmitter (2), is respectively arranged at the plurality of wheel (5a～5d), has establishment concurrent Send the 1st control portion (23) of the frame containing intrinsic identification information；And

Receptor (3), is arranged at described car body (6) side, has the 2nd control portion (33), institute The 2nd control portion (33) that states carries out wheel position detection, in described wheel position detects, via Reception antenna (31) receives the described frame sent from described transmitter (2), thus specific by institute The described transmitter (2) stating frame transmission is installed in the plurality of wheel (5a～5d) Which, by the plurality of wheel (5a～5d) be respectively arranged at the plurality of wheel (5a～5d) The identification information of described transmitter (2) set up corresponding and store,

Described transmitter (2) has the acceleration of the output detection signal corresponding with acceleration and passes Sensor (22), this acceleration comprises with the wheel (5a～5d) being provided with this transmitter (2) Rotation and the gravitational acceleration component that changes,

Described wheel position detecting device is characterised by,

Described 1st control portion (23) is to be provided with the wheel (5a～5d) of this transmitter (2) Central shaft centered by, and the optional position of the circumferencial direction of this wheel (5a～5d) is set to Angle 0 degree, the gravity that detection signal based on described acceleration transducer (22) is comprised accelerates Degree component detects the angle of described transmitter (2), and becomes predetermined angular in this angle Moment sends described frame repeatedly,

Described 2nd control portion (33) is based on the tooth exported with gear (12a～12d) by phase The detection signal of the vehicle-wheel speed sensor (11a～11d) of corresponding detection signal, obtains table Show the gear information of the tooth position of described gear (12a～12d), and reception based on described frame Described tooth position during the moment sets fluctuation permission amplitude, if after setting this fluctuation permission amplitude Time of reception of described frame time described tooth position outside the scope of described fluctuation permission amplitude, then Remove from the candidate of the wheel (5a～5d) being provided with the transmitter (2) that have sent this frame, And using remaining wheel (5a～5d) as being provided with the transmitter (2) that have sent described frame Wheel is registered, and described gear (12a～12d) is with the plurality of wheel (5a～5d) even Dynamic rotation,

Described 2nd control portion (33) is whenever receiving described frame just according to the size table concavo-convex with road surface The pavement state shown is to change described fluctuation permission amplitude, and rough road is compared with flat road surface, relatively Broadly set fluctuation permission amplitude,

Further, described 2nd control portion (33) allows whenever the described frame of reception just changes described fluctuation Amplitude, the described tooth position during time of reception based on described frame sets fluctuation permission amplitude, and This fluctuation allow amplitude allow width with the fluctuation set by the time of reception of previous described frame The section sets of degree overlap is that new fluctuation allows amplitude.

Wheel position detecting device the most according to claim 1, it is characterised in that

Described 1st control portion (23) detection signal based on described acceleration transducer (22) Detection pavement state, and the testing result of pavement state is contained in described frame and carries out sending out Send,

Described 2nd control portion (33) testing result based on the pavement state included in described frame Set described fluctuation permission amplitude.

Wheel position detecting device the most according to claim 2, it is characterised in that

Described 1st control portion (23) carries from the detection signal of described acceleration transducer (22) Taking the noisy gravitational acceleration component of superposition, computing is superimposed with the gravitational acceleration component of this noise The difference (Δ G) of maxima and minima of value, if this difference (Δ G) exceedes the threshold value of regulation, Being judged to that pavement state is rough road, if being not above, being judged to that pavement state is smooth road Face.

4. a tire pneumatic pressure detector, it comprises any one of claims 1 to 3 described Wheel position detecting device, it is characterised in that

Described transmitter (2) possesses sensing detection portion (21), and this sensing detection portion (21) exports The detection letter corresponding with the air pressure of the described tire that the plurality of wheel (5a～5d) possesses respectively Number, by described 1st control portion (23), the detection signal in described sensing detection portion will be carried out letter Relevant to tire pressure information storage after number processing, to after frame, sends the frame to described reception Device (3),

Described receptor (3) by described 2nd control portion (33), according to this tire pressure phase The information closed, detects the air pressure of the described tire that the plurality of wheel (5a～5d) possesses respectively.