CN103786605B - The determination of automotive seat position and adjustment - Google Patents
The determination of automotive seat position and adjustment Download PDFInfo
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- CN103786605B CN103786605B CN201210427355.XA CN201210427355A CN103786605B CN 103786605 B CN103786605 B CN 103786605B CN 201210427355 A CN201210427355 A CN 201210427355A CN 103786605 B CN103786605 B CN 103786605B
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Abstract
<b>the present invention relates to automotive electronic technology, particularly to being used for determining and adjust the method for automotive seat position and automotive seat adjustment system。In the control method according to the automotive seat position of the present invention, comprise the following steps: with target location, the current location according to described automotive seat determines that described direct current generator needs the number of turns rotated；Starting described direct current generator and obtain the sampled value of current waveform of described direct current generator, described current waveform comprises ripple component；The sampled value of described current waveform is carried out conversion process to obtain conversion process value；And sue for peace in time obtain summing value and control described direct current generator according to described summing value to described conversion process value so that it is rotate the number of turns needed。According to embodiments of the invention, adopting the ripple component in current waveform to determine the number of turns of electric machine rotation, this eliminates the trouble of attachment multi-pole magnet-ring。</b>
Description
Technical field
The present invention relates to automotive electronic technology, particularly to being used for determining and adjust the method for automotive seat position and automotive seat adjustment system。
Background technology
Automotive seat must is fulfilled for the requirement of comfortableness, and driver namely can be made to obtain the best visual field, obtains being prone to steering dish, pedal, gear lever etc. and handles facility, it is also possible to obtain the most comfortable and be accustomed to most take angle。But everyone build is not quite alike, and with advancing age it also occur that change, therefore when designing driver's seat, designers can only be grown up according to somewhere the statistical data of stature, finds out average data and designs driving space and seat。
Thus draw to automotive seat second basic demand-controllability。On Hyundai Motor, manufacturer can provide the seat being electrically adjusted。Automatic seat is generally made up of seat cushion, backrest, headrest, skeleton, suspension and governor motion etc.。Governor motion is made up of controller, dc motor and drive disk assembly, is the most complicated in automatic seat and most critical part。Dc motor generally has more than three, and they are controlled by the controller and drive the drive disk assembly of certain adjustment direction respectively。Drive disk assembly has worm shaft, worm gear, tooth axle and tooth bar etc.。During adjustment, worm shaft is under the driving of motor, drives worm gear wheel, thus tooth axle is threaded in or out, i.e. and the lifting of seat。If worm gear engages with tooth bar again, tooth bar is moved by worm gear wheel, even seat reach or after move。For medium-to-high grade car, being further equipped with steering position and regulate memory setting, memory content such as includes seat adjusting position, steering wheel regulates and exterior mirror etc. regulates memory。
Fig. 1 illustrates that a kind of automotive seat with typical structure regulates system。
As indicated with 1, this automotive seat adjustment system 10 includes direct current generator 110, current detecting unit 120, controller 130, relay 140 and Hall element 150。Controller 130 controls the operating of direct current generator 110 by controlling the on off operating mode of relay 140。The rotating shaft 110A of direct current generator 110 is bonded with multi-pole magnet-ring 110B, Hall element 150 is arranged near rotating shaft 110A, so when rotating shaft 110A rotates, when each magnetic pole of magnet ring 110B turns near Hall element 150, to produce Hall pulse signal in Hall element 150, this pulse signal reflects the position signalling of seat indirectly。Referring to Fig. 1, this pulse detection signals is fed back to controller 130, and thus, direct current generator 110 can rotate the required number of turns under the control of controller 130。Additionally, also access current detecting unit 120 in the loop at direct current generator 110 place, its by the current signal output that detects to controller 130, to be judged the running status (such as level of torque, whether stall etc. occurs) of direct current generator 110 by controller 130。
In above-mentioned automotive seat adjustment system, adopting the method based on Hall element to determine seat position, there is more shortcoming in this。Such as, in order to produce Hall pulse signal, it is necessary to install multiple magnet ring on machine shaft, which increase manufacture and installation cost, and along with the continuity of the time of use, magnet ring is also easy to come off from rotating shaft。
Therefore, in the urgent need to a kind of automotive seat control method that can overcome disadvantages mentioned above and system。
Summary of the invention
It is an object of the invention to provide a kind of method determining automotive seat position, it has and realizes the advantage that cost is low, accuracy is high。
The above-mentioned purpose of the present invention is realized by following technical proposal:
A kind of method determining automotive seat position, described automotive seat, by DC motor Driver, comprises the following steps:
Obtaining the sampled value of the current waveform of described direct current generator, described current waveform comprises ripple component；
The sampled value of described current waveform is carried out conversion process to obtain conversion process value；
Sue for peace in time to obtain summing value to described conversion process value；And
The current location of described automotive seat is determined in reference position according to described summing value and described automotive seat。
Preferably, in the above-mentioned methods, as follows the sampled value of described current waveform is carried out conversion process:
Here IiFor ith sample value, Ii TranFor the transformed value of ith sample value, Max (Ii,Ii-1…Ii-n+1) for the maximum of nearest n digitized sampled value, Min (Ii,Ii-1…Ii-n+1) for the minima of nearest n digitized sampled value。
Preferably, in the above-mentioned methods, the voltage accessed by measurement on the resistor in described direct current generator loop obtains described current waveform。
Preferably, in the above-mentioned methods, described reference position is the previous post exercise position of described automotive seat。
Preferably, in the above-mentioned methods, described reference position is the extreme position of described automotive seat, and periodically or aperiodically calibrates described reference position。
The present invention's it is also an object that provides the control method of a kind of automotive seat position, and it has and realizes the advantage that cost is low, accuracy is high。
The above-mentioned purpose of the present invention is realized by following technical proposal:
The control method of a kind of automotive seat position, described automotive seat, by DC motor Driver, comprises the following steps:
Current location according to described automotive seat and target location determine that described direct current generator needs the number of turns rotated；
Starting described direct current generator and obtain the sampled value of current waveform of described direct current generator, described current waveform comprises ripple component；
The sampled value of described current waveform is carried out conversion process to obtain conversion process value；And
Sue for peace in time described conversion process value obtain summing value and control described direct current generator according to described summing value so that it is rotate the number of turns needed。
Preferably, in the above-mentioned methods, farther include to record the step of the current location of described automotive seat。
Preferably, in the above-mentioned methods, described target location is the position of the user preference prestored。
The present invention also has purpose to be to provide a kind of automotive seat to regulate system, and it has and realizes the advantage that cost is low, accuracy is high。
The above-mentioned purpose of the present invention is realized by following technical proposal:
A kind of automotive seat regulates system, including:
Direct current generator, is used for driving described automotive seat；
Current detecting unit, for obtaining the sampled value of the current waveform of described direct current generator, described current waveform comprises ripple component；
The controller coupled with described current detecting unit, determine that described direct current generator needs the number of turns rotated for the current location according to described automotive seat and target location, the sampled value of described current waveform is carried out conversion process to obtain conversion process value, described conversion process value is sued for peace to obtain in time summing value, and determines the current location of described automotive seat according to the reference position of described summing value and described automotive seat。
Preferably, in above-mentioned automotive seat adjustment system, described current detecting unit is the resistor accessing described direct current generator loop。
Preferably, in above-mentioned automotive seat adjustment system, described controller includes:
Signal conversion process unit, carries out conversion process to obtain conversion process value to the sampled value of described current waveform；
Sum unit, for suing for peace in time to obtain summing value to described conversion process value；And
Control signal generates unit, for generating the control signal to described direct current generator according to summing value。
Preferably, in above-mentioned automotive seat adjustment system, described target location is the position of the user preference prestored, and described controller also includes the memorizer for storing described target location。
According to embodiments of the invention, adopting the ripple component in current waveform to determine the number of turns of electric machine rotation, this eliminates the trouble of attachment multi-pole magnet-ring。On the other hand, owing to ripple component takes from the current signal measured for monitoring motor operating state, therefore without being equipped with special position signalling detecting element, cost is reduced。Additionally, in an embodiment of the present invention, sue for peace after current waveform is performed conversion process, it is possible to eliminate the amplitude of single ripple and detection error that morphological differences causes。
From described further below in conjunction with accompanying drawing, it will make above and other objects of the present invention and advantage be more fully apparent from。
Accompanying drawing explanation
Fig. 1 illustrates that a kind of automotive seat with typical structure regulates system。
Fig. 2 is the flow chart of the method for the determination automotive seat position according to one embodiment of the invention。
Fig. 3 illustrates typical direct current generator current waveform figure。
Fig. 4 is the flow chart of the control method of the automotive seat position according to another embodiment of the present invention。
Fig. 5 is the schematic diagram of the automotive seat position regulating system according to another embodiment of the present invention。
Fig. 6 is the structural representation of the controller in the automotive seat position regulating system shown in Fig. 5。
Detailed description of the invention
Detailed description of the invention is described to set forth the present invention below with reference to accompanying drawing。It should be understood that these detailed description of the invention are merely exemplary, for the spirit and scope of the present invention and unrestrictedly act on。
In this manual, " motion " word can be understood as the change of object space state, and its form such as includes translation, rotation or their combination etc.。" coupling " word should be understood to the situation including directly transmitting energy or signal between two unit, or indirectly transmit the situation of energy or signal through one or more Unit the 3rd, and signal designated herein includes but not limited to the signal of the form existence with electricity, light and magnetic。Additionally, " comprising " and the term of " including " etc represents except having the unit and step having in the specification and in the claims directly and clearly state, technical scheme is also not excluded for the situation with other unit and the step directly or clearly do not stated。Furthermore, the term of such as " first ", " second ", " the 3rd " and " the 4th " etc is not offered as unit or the numerical value order in time, space, size etc. and is only be used as to distinguish each unit or numerical value。
It may also be noted that convenient for setting forth, in accompanying drawing, each unit might not be drawn according to the ratio of they reality, and in accompanying drawing, the size of each unit and the ratio between them do not constitute limiting the scope of the present invention。
Fig. 2 is the flow chart of the method for the determination automotive seat position according to one embodiment of the invention。Although in actual applications, multiple DC motor Driver automotive seat may be adopted to do the motion of various ways, but for simplicity, only translate (elevating movement or movable of such as seat) for seat position along a direction in the present embodiment, those skilled in the art will recognize that, for being translatable to outer forms of motion, principles of the invention is also applicable。
As in figure 2 it is shown, in step 210, control device (such as automotive seat regulates the controller of system) and obtain the current waveform signal of the direct current generator driving automotive seat from current detecting unit。In actual applications, current waveform signal can be utilize A/D converter, and measured value is also converted to digital value by the series of measured values obtained of sampling at a certain time interval。The measurement of electric current can adopt various ways, for instance the dividing potential drop method based on resistor and the hall measurement method based on magnetic field effect, these methods are all applied to here。Additionally, these measured values can be exported to controlling device by current detecting unit in real time, it is also possible to be buffered in current detecting unit and export in bulk to controlling device。
Fig. 3 illustrates typical direct current generator current waveform figure。
Referring to Fig. 3, when even running, current waveform is not straight line, but the curve of cyclical fluctuations around baseline fluctuation, is equivalent in DC component superposition AC compounent (this AC compounent is also referred to as ripple component)。This fluctuation is mainly determined by the having structure feature of direct current generator, i.e. the commutator segment of engine commutator arranges at certain intervals, and when rotating, brush contacts successively with each commutator segment, so that comprising the ripple component around DC component fluctuation in electric current。Assume that number of segment is k, then there is following relationship in current ripples frequency f and motor speed n:
F=k × n(1)
It is worthy of note, actual current signal may be with many " burr ", they with brush and commutator segment galvano-cautery situation and during commutation before brush end relevant with the discharged condition of rear brush end, and only reflect that ideal waveform contact between brush with commutator segment generally can be considered as these envelop forms being with " burr " waveforms。Therefore when directly digitized sampled value is done integral operation with obtain integrated value time, this " burr " will cause integral error, thus impact position determines the accuracy of result。Although conventional filtering method (such as middle position value filtering method, first-order lag filter method, digital averaging filtering method and iir digital filter etc.) can be adopted to carry out filtering interfering burr, but the present inventor finds after further investigation, when adopt following by the signal transformation method that inventors suggest that after, it is possible to avoid this cumulative error。
With continued reference to Fig. 2, enter step 220 after step 210, ripple component is carried out signal conversion process which will be described to remove disturbing signal。This signal conversion process can utilize special hardware circuit to realize, it is also possible to utilizes the computer program operating on universal computing device to realize。
As it has been described above, current waveform signal is usually the multiple digital values obtained of sampling at a certain time interval, in the present embodiment, can adopt following formula that these digital values are carried out conversion process:
Here IiFor ith sample value, Ii TranFor the transformed value of ith sample value, Max (Ii,Ii-1…Ii-n+1) for the maximum (with ith sample value for benchmark) of nearest n digitized sampled value, Min (Ii,Ii-1…Ii-n+1) for the minima (with ith sample value for benchmark) of nearest n digitized sampled value。
Subsequently in step 230, according to following formula, transformed value is carried out temporal summation:
Here S is summing value, and m is the quantity of sampled value, Ii TranFor the transformed value of ith sample value, Δ t is the sampling time interval that above-mentioned digitized sampling value is corresponding。
Subsequently enter step 240, determine its current location according to the reference position of summing value S and automotive seat。Following formula such as can be utilized to determine current location:
Here S0The summing value of transformed value when rotating one week for direct current generator, N is the rotation number of turns of direct current generator, LcFor the current location of automotive seat, LrefReference position for automotive seat, for instance can being the previous post exercise position of automotive seat, Δ L be the translational movement of the automotive seat position caused by direct current generator per revolution。It is assumed here that L when motor rotates along clockwise directionrefIt is added with n × Δ L, and L when rotating counterclockwiserefSubtract each other with n × Δ L, but contrary hypothesis on result without substantial impact。
Subsequently enter step 250, use current location LcUpdate previous reference position LrefDetermination for position next time。
Alternatively, in one embodiment of the invention, it is possible to periodically or aperiodically calibrate reference position。Specifically, automotive seat can be periodically or non-periodically made to enter extreme position (on this position, automotive seat cannot continue to move along the direction of motion identical with previous moment, the two ends etc. of the top of such as lifting position, the bottom of down position and movable position), and reference position is updated to this extreme position, the integral error above accumulated thus is made to reset。
Fig. 4 is the flow chart of the control method of the automotive seat position according to another embodiment of the present invention。
As shown in Figure 4, in step 410, control device (such as automotive seat regulates the controller of system) and obtain the target location that automotive seat needs to arrive。Owing to automotive seat could be designed to along multiple directions work is linear mobile or around axis of rotation, target location therefore is likely to comprise multiple positional value (parameter)。In one embodiment, this target location can adopt the form of the one group of location parameter inputted by user。Or alternatively, controlling seat position parameters default when user can previously be driven by device and be set as the desired target location of this user, after user inputs corresponding ID, controlling device can as index search to this corresponding group location parameter。
Subsequently enter step 420, control device in memorizer, transfer the current location of automotive seat, namely location after the last automotive seat motion。It is alternatively possible to up-to-date position is stored in memorizer as current location together with time stamp after regulating automotive seat every time。
Subsequently in step 430, control device and determine that direct current generator needs the direction of the number of turns and the rotation rotated according to the current location of automotive seat with target location。Following formula such as can be utilized to calculate the number of turns N of required rotation:
Wherein, LcFor the current location of automotive seat, LtarFor the target location of automotive seat, Δ L is the translational movement of the automotive seat position caused by direct current generator per revolution。Equally, here although it is assumed that L when motor rotates along clockwise directioncDeduct Ltar, and L when rotating counterclockwisetarDeduct LcBut, contrary hypothesis on result without substantial impact。
Subsequently enter step 440, control device and start direct current generator and current detecting unit simultaneously。When direct current generator starts running, current detecting unit is namely to controlling the current waveform signal that device output drives the direct current generator of automotive seat。As it has been described above, current waveform signal can be that a series of sampling at a certain time interval obtains and digitized measured value。In the present embodiment, the measured value of current waveform signal is cached and sends the measured value of these buffer memorys every certain cycle (being also called the transmission cycle below) to control device by current detecting unit。
Subsequently, in step 450, control device, by the step 220 that performs in Fig. 2, the direct current generator current waveform received from current detecting unit carried out conversion process, and by execution step 230, changing value is carried out summation operation, thus obtain current summing value。Such as can calculate current summing value according to following formula:
Here the summing value calculated when S (i) and S (i-1) respectively i-th send end cycle and during (i-1) individual transmission end cycle, m is the quantity of the sampled value in the i-th transmission cycle, Iij TranFor the transformed value of the jth sampled value in the i-th transmission cycle, Δ t is the sampling time interval corresponding with the jth sampled value in the i-th transmission cycle。
Subsequently enter step step 460, control device and judge whether direct current generator have rotated the number of turns determined in step 430。Following condition such as can be utilized as basis for estimation:
S(i)≥N×S0(8)
Here S0The summing value of current waveform when rotating one week for direct current generator, N is the required number of turns rotated of direct current generator。
If it is judged that be true, then enter step 470, control current location previous in the more new memory of device target location；Otherwise return step 450。
Fig. 5 is the schematic diagram of the automotive seat position regulating system according to another embodiment of the present invention。
Include for driving the direct current generator 510 of automotive seat, current detecting unit 520, controller 530 and pwm unit 540 as it is shown in figure 5, regulate system 50 according to the automotive seat of the present embodiment。
Current detecting unit 520 is for detecting the electric current in loop, direct current generator 510 place。In the present embodiment, current detecting based on dividing potential drop mode, for this, the A/D converter that current detecting unit 520 comprises voltage grading resistor and the voltage to voltage grading resistor two ends is sampled。Current detecting unit 520 can also comprise high-speed cache, and sampled signal or measured value that A/D converter obtains can be stored temporarily in this high-speed cache and be sent periodically to controller 530。
Controller 530 exports the dutycycle of signal control the operating of direct current generator 510 by controlling pwm unit 540, thus automotive seat is adjusted to desired position。Such as, according to the current location of automotive seat and target location, controller 530 can determine that direct current generator 510 needs the number of turns rotated, the current waveform signal that current detecting unit 520 is sent carries out conversion process and transformed value carries out summation operation, and controls the operating of direct current generator 510 according to summing value。
Additionally, controller 530 can also judge the running status (such as level of torque, whether stall etc. occur) of direct current generator 510 according to the current signal that current detecting unit 520 detects。
It is worthy of note, although automotive seat only comprises a direct current generator in the above-described embodiments, but as long as system structure is done corresponding change be namely suitably adapted for the situation of many motors。Such as when adopting a controller, configure independent current detecting unit for each motor to be connected with pwm unit and with controller, thus enabling the controller to the current waveform according to each motor, by the independently controlled each direct current generator of respective pwm unit。It addition, in the present embodiment, the actuator controlling direct current generator is pwm unit, but can also adopt other type of mechanism, for instance include but not limited to relay etc.。
Fig. 6 is the structural representation of the controller in the automotive seat position regulating system shown in Fig. 5。
As shown in Figure 6, controller 530 includes communication interface 531, signal conversion process unit 532, sum unit 533, memorizer 534 and control signal generation unit 535。
Communication interface 531 is responsible for and the communication of the unit being positioned at outside controller 530。Particularly, communication interface 531 communicates with the current detecting unit 520 in Fig. 5, to receive current waveform signal or measured value and to send the instruction that starting current detection unit 520 runs。It communicates with the pwm unit 540 in Fig. 5, and the control instruction generated so that control signal to generate unit 535 is sent to pwm unit 540。It addition, communication interface 531 also communicates with user input device (such as touch screen, button etc.), for receiving data and the instruction of user's input。
Signal conversion process unit 532 couples with communication interface 531, and its current waveform signal that communication interface 531 is received carries out above by the conversion process as described in Fig. 2。Sum unit 533 generates unit 534 with signal conversion process unit 532 and control signal and couples, and the current waveform signal after conversion process is sued for peace and to control signal, operation result output is generated unit 535 by it。Sum unit 533 such as can adopt the mode described by embodiment described in Fig. 4 above to complete。
Memorizer 534 generates unit 535 with control signal and sum unit 533 couples, the current location of its seat target location that can store user preference and seat。
Control signal generates unit 535 and couples with communication interface 531, signal conversion process unit 532, sum unit 533 and memorizer 534, it is responsible for controlling and the operation of other unit in tuning controller 50 on the one hand, also generates the control signal to direct current generator 510 on the other hand。Such as, control signal generates unit 535 can such as according to the mode described by embodiment illustrated in fig. 4 above, the required number of turns rotated of direct current generator 510 is determined in the target location of the target location received according to communication interface 531 or the user preference stored in memorizer 534, whether direct current generator 510 turns to the required number of turns or whether automotive seat arrives desired position to utilize the summed result that sum unit 533 exports to determine, if arrival desired position, then it generates the instruction making pwm unit 540 stop output signal, otherwise generate the instruction making pwm unit 540 export the signal with certain dutycycle。
It is worthy of note, in the embodiment shown in fig. 6, control signal generates and couples respectively between unit 535 and other unit within controller, but by bus mode, above-mentioned communication interface 531, signal conversion process unit 532, sum unit 533, memorizer 534 and control signal can also be generated unit 535 inside controller and be coupled。Additionally, although signal conversion process unit 532 in controller noted above, sum unit 533 and control signal generate unit 535 can respectively with special hardware circuit realization, but at least part of unit in them can also be realized by the mode of general purpose microprocessor+software module。
Due to can under the spirit without departing substantially from basic feature of the present invention, implement the present invention in a variety of manners, therefore present embodiment is illustrative and not restrictive, define owing to the scope of the invention, rather than defined by description, therefore fall into all changes in the border of claim and boundary, or the equivalent of this claim border and boundary thus forgiven by claim。
Claims (14)
1. the method determining automotive seat position, described automotive seat is by DC motor Driver, it is characterised in that comprise the following steps:
Obtaining the sampled value of the current waveform of described direct current generator, described current waveform comprises ripple component；
The sampled value of described current waveform is carried out conversion process to obtain conversion process value；
Sue for peace in time to obtain summing value to described conversion process value；And
The current location of described automotive seat is determined in reference position according to described summing value and described automotive seat。
2. the method for claim 1, wherein as follows the sampled value of described current waveform is carried out conversion process:
Here IiFor ith sample value, Ii TranFor the transformed value of ith sample value, Max (Ii,Ii-1…Ii-n+1) for the maximum of nearest n digitized sampled value, Min (Ii,Ii-1…Ii-n+1) for the minima of nearest n digitized sampled value。
3. the voltage the method for claim 1, wherein accessed on the resistor in described direct current generator loop by measurement obtains described current waveform。
4. the method for claim 1, wherein described reference position is the previous post exercise position of described automotive seat。
5. the method for claim 1, wherein described reference position is the extreme position of described automotive seat, and periodically or aperiodically calibrates described reference position。
6. a control method for automotive seat position, described automotive seat is by DC motor Driver, it is characterised in that comprise the following steps:
Current location according to described automotive seat and target location determine that described direct current generator needs the number of turns rotated；
Starting described direct current generator and obtain the sampled value of current waveform of described direct current generator, described current waveform comprises ripple component；
The sampled value of described current waveform is carried out conversion process to obtain conversion process value；And
Sue for peace in time described conversion process value obtain summing value and control described direct current generator according to described summing value so that it is rotate the number of turns needed。
7. method as claimed in claim 6, farther includes to record the step of the current location of described automotive seat。
8. method as claimed in claim 6, wherein, carries out conversion process to the sampled value of described current waveform as follows:
Here IiFor ith sample value, Ii TranFor the transformed value of ith sample value, Max (Ii,Ii-1…Ii-n+1) for the maximum of nearest n digitized sampled value, Min (Ii,Ii-1…Ii-n+1) for the minima of nearest n digitized sampled value。
9. method as claimed in claim 6, wherein, described target location is the position of the user preference prestored。
10. an automotive seat regulates system, it is characterised in that including:
Direct current generator, is used for driving described automotive seat；
Current detecting unit, for obtaining the sampled value of the current waveform of described direct current generator, described current waveform comprises ripple component；
The controller coupled with described current detecting unit, determine that described direct current generator needs the number of turns rotated for the current location according to described automotive seat and target location, the sampled value of described current waveform is carried out conversion process to obtain conversion process value, described conversion process value is sued for peace to obtain in time summing value, and determines the current location of described automotive seat according to the reference position of described summing value and described automotive seat。
11. automotive seat as claimed in claim 10 regulates system, wherein, described current detecting unit is the resistor accessing described direct current generator loop。
12. automotive seat as claimed in claim 10 regulates system, wherein, described controller includes:
Signal conversion process unit, carries out conversion process to obtain conversion process value to the sampled value of described current waveform；
Sum unit, for suing for peace in time to obtain summing value to described conversion process value；And
Control signal generates unit, for generating the control signal to described direct current generator according to summing value。
13. automotive seat as claimed in claim 12 regulates system, wherein, the sampled value of described current waveform is carried out conversion process by described signal conversion process unit as follows:
Here IiFor ith sample value, Ii TranFor the transformed value of ith sample value, Max (Ii,Ii-1…Ii-n+1) for the maximum of nearest n digitized sampled value, Min (Ii,Ii-1…Ii-n+1) for the minima of nearest n digitized sampled value。
14. automotive seat as claimed in claim 10 regulates system, wherein, described target location is the position of the user preference prestored, and described controller also includes the memorizer for storing described target location。
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| JP5155056B2 (en) * | 2008-07-31 | 2013-02-27 | アイシン精機株式会社 | Position control device |
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2012
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2903989Y (en) * | 2006-04-25 | 2007-05-23 | 郎唬猛 | Device for low cost testing DC electric machine running state |
| CN101585324A (en) * | 2008-05-23 | 2009-11-25 | 李尔公司 | A motor vehicle electric motor speed control system |
| EP2514630A1 (en) * | 2009-12-17 | 2012-10-24 | Toyota Shatai Kabushiki Kaisha | Vehicle seat |
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