Shift Control of Power Split Continuously Variable Transmission Fan Xin1, a, *, Zhang Lanchun1, b, Zhao Jingbo1, c

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1 nd Intrnatonal Confrnc on Adancs n Mchancal Engnrng and Industral Informatcs (AMEII 06 Shft Control of Powr Splt Contnuously Varabl Transmsson Fan Xn, a, *, Zhang Lanchun, b, Zhao ngbo, c School of Automobl and Traffc Engnrng, angsu Unrsty of Tchnology, Changzhou, angsu, 300, Chna a fanamng@qq.com, *corrspondng author, bzhanglanchun@qq.com, c66887@qq.com Kywords Powr splt, CVT, Shftng control, Smulaton Abstract. In ordr to study th shft control of powr splt contnuously arabl transmsson (PSCVT, th ntgratd shft dynamc modls for th st of ngn, magntc powdr clutch and transmsson ar stablshd basd on th analyss of ts confguraton and workng prncpl. Th shft smulaton shows that th magntc powdr clutch connctng condton can b adjustd and th shftng qualty can b mprod by mans of controllng magntc powdrs clutch fld currnt, whch at last rsult n th mpromnt of hcl prformanc. Introducton Powr Splt CVT [-3] (Powr splt contnuously arabl transmsson, PSCVT s composd by blt typ contnuously arabl transmsson dc and plantary gar tran wth two dgrs of frdom, wth a sutabl lctrcal control of magntc powdr clutch whch rplacs a conntonal clutch, and conducts powr transmsson parallld wth ngn wth th applcaton of powr splt prncpl [4-7]. Both th usng of blt typ contnuously arabl dc to ach CVT, and passng part of th powr through th plantary gar tran, PSCVT not only can rduc th load of th blt n ordr to sol th problm of dry-typ wth a lowr carryng capacty, but also mpro th ffcncy of th transmsson. Forgn rsarch nsttutons and nsttutons also conduct rlatd rsarch [8-0]. Composton And Workng Prncpl Of PSCVT Powr Splt CVT dsgn prsntd n ths papr appls to th conomc front dr car wth front ngn. Shown n Fgur, n ordr to mpro th prformanc of th hcl startng and mt th nd for rrsng th hcl, th transmsson s dsgnd to thr opratng mods: car startng mod, contnuously arabl transmsson gars mod and rrs gar mod. In ordr to xpand th rang of contnuously arabl transmsson, contnuously arabl gar s xpandd nto th low gar and hgh gar. Swtchng btwn th gars s don automatcally by controllng th magntc powdr clutch and th shftng mchansm. Contnuously arabl gar s ky runnng gar. Th spd rato of th contnuously arabl unt s adjustd by th mplmntng mchansm wth dual motor, through th control of two motors to ach prcs adjustmnt of th spd rato [6]. Th transmsson uss th car magntc clutch as a powr transmsson mmbr, whch uss th magntc powdr of th soft magntc matral to form magntc chan undr th xctaton currnt through th col. Th frctonal forcs, whch gnratd by lctromagntc forcs among th magntc powdr, transmt th torqu to th drn mmbr. Undr th nflunc of th non-wak magntzng currnt, th rlatonshp btwn th output torqu of magntc clutch and th xctaton currnt shows strong lnar charactrstcs. That hlps to ralz asly a smooth ncras n torqu and allow longr tm slppng. Compard wth th torqu conrtr, magntc clutch can prnt from crawlng whn shftng and slp loss whch always xsts. So, t has hghr transfr ffcncy. 06. Th authors - Publshd by Atlants Prss 489

2 Fg. Structur dagram of powr splt contnuously arabl transmsson. Engn flywhl. Magntc powdr clutch 3. Input shaft 4, 6. Gar rng 5. Startng mod / CVT gar mod synchronzr 6, 7. Act pully 8. Fxd plat among act whl 9. Scrw nut 0. Motor spd rducton gar par. Th scrw.v typ blt 3, 4. Fxd, unfxd plat of drn pully 5. On-way clutch 7. Gar rng 8. Sun gar 9. Plantary gar holdr 0,. Drng and drn gar of CVT nd mod. Synchronzr of CVT st and nd mod 3, 4. Drng and drn gar of CVT st mod 5. Rrs gar synchronzr 6. Rrs drng gar 7. Idlr whl rrs of gar 8.Th output gar of rrs gar 9. Output shaft Undr bst shft ruls, th hcl automatc shft systm must procss of shftng tmly and accuratly, and spd should chang smoothly wthout hgh nstantanous acclraton and dclraton n th procss of shftng. If th abo rqurmnts can not b mt, t wll also ncras th dynamc load of th transmsson systm, and rduc th transmsson systm componnt lf, n addton to affctng th comfort. So th transmsson shft control s mportant. Intgratd Modlng Of Engn - Magntc Clutch - Garbox Powr Splt Automatc transmsson dynamc modl of th powr transmsson systm s basd on th ntgratd dynamc modl of ntrnal combuston ngn, and magntc clutch and transmsson modlng objct modl, whch taks nto account th stat bfor shftng and th shftng synchronzaton procss stat. Th dynamcs modlng assumptons: ( no slppng of dr whls; ( no gaps btwn procsss. Stags wth largr ffct on th shft qualty ar magntc powdr clutch ngagmnt procss nto a nw gar shft and shftng synchronzaton procss. Shftng st Gar Into Low CVT Gar: Bfor shftng (clutch s ngagd + + ω = ω = ω ω ω = PSAT o ( T T PSAT PSAT T ( 490

3 T w = To w = ( Tsy Low ( + + δ To w = ( Tsy Low( + CVU To w z = w = ( Tsy ( + + δ w w w = + Low( + ( + LowCVU T = ( T Low o sy Low( + Low ( + + δ + ( + T ( T ( + o sy LowCVU Low CVU In th startng gar, th transmsson synchronzr ngags lft, whl changng nto CVT gar, th transmsson synchronzr ngags rght. Kntc quaton of shftng procss s shown on formula. Upshft synchronzaton procss: whn th clutch s bng dsngagd, th synchronzr 5 ngags rght. Assumng that th torqu T sy transmttd by th synchronzr, for th lft sd of th synchronzr, th load torqu T 0 s conrtd to gt formula. Formula (, ( transformd nto th stat quaton can b obtand: ω = aω+ bu y = cω + du Th paramtrs bfor shftng: y=[ω ω ω ] T,u=[T T o ] T,ω=[ω ω ω ],a=[0] 3 3,d=[0] 3,c=dag[ ] PSAT + + PSAT PSAT b = PSAT + + PSAT PSAT PSAT PSAT + + PSAT PSAT Th paramtrs whn upshft synchronzng: ω=[ω ω l ω ω z ω ],a=[0] 5 5,u=[T T sy T o ],c=dag[ ],d=[0] δ + δ Low b = 0 Low( + CVU δ + δ Low 0 ( + LowCVU ( + δ Low ( + ( + δ Low ( + LowCVU ( + ( (3 Shftng Low Gar Into Hgh Gar Of CVT Gar Whn shftng low gar nto hgh gar of CVT gar, magntc clutch nds to b dsconnct and th synchronzr ngags rght combnaton. Th rsultng formula s as follows: 49

4 T ω = ( + ω = Tsy3 ' + CVU ( + HghT ω z3 = ( Tsy3 ω 3 = ( Tsy3 To ω = ω 3 = ( Tsy3To CVU Hgh ' In th formula th paramtr wth th subscrpt rprsnts th synchronzr drn nd, z rprsnts th drng sd. Whn th CVT upshftng from low gar, th clutch must b dsconnctd to dclrat th sun gar as possbl to th dsrd alu. Whn downshftng from hgh gar, th clutch nds to b kpt combnaton to mpro th drn whl spd Low. Th CVT gar downshft kntc quaton from hgh gar: ( + T ( + w = w = ( T + ( + Low w z ' = ( T 3 Tsy3 z ' w = ( T 3 sy3 To w = w 3 Low CVU Low sy3 z ' CVU Th dffrnc btwn downshft and upshft: th fnal drn gars at th momnt of nrta alus ar dffrnt, and th rst ar th sam. (4 (5 Transmsson Dynamc Shft Smulaton Whn Shftng nto CVT low gar from startng gar, for xampl, synchronzaton componnts spd curs ar shown n Fgur and Fgur 3, durng th Powr Splt CVT upshft procsss from th modl smulaton. Dscrbd n th two fgurs s a dynamc procss of PSCVT upshft, two fgurs dscrb two mportant stags of th lctroncally controlld synchronzr synchronzaton and magntc partcl clutch synchronzaton durng th upshft procsss. Th synchronzaton procdur of th magntc powdr clutch rqurs that th hcl spd chang s smoothr, and th mpact dgr s small, thrfor th bondng procss of th magntc clutch nd control. Its two control amounts nclud th rat of chang of th ntal xctaton currnt and th xctaton currnt of th magntc clutch. Bfor th synchronzng btwn drng mmbr spd ω z and drn mmbr spd ω n lctrcally controlld synchronzr, th magntc clutch s n th off stat, and synchronzaton procss of lctrcally controlld synchronzr nds to b compltd quckly. In ths procss, du to th ffct of nrta of th hcl, th hcl spd chang s not obous. Aftr th nd of th synchronzaton procss of th lctrcally controlld synchronzr, magntc clutch starts supplyng powr. Th start tm pont of xctaton currnt s shown n Fgur, Fgur 3, th magntc clutch of th drng and drn mmbr s n a sld-grndng procss. Aftr th synchronzaton pont of th magntc clutch s th nd of th synchronzaton procss, and xctaton currnt of th magntc powdr clutch rs rapdly to th ratd currnt. 49

5 Fg. Spd cur of shft procss synchronzaton componnts (Th largr ntal alu and growth rat of th xctaton currnt Fg3. Spd cur of shft procss synchronzaton componnts (Th smallr ntal alu and growth rat of th xctaton currnt Tab. Synchronzaton componnt charactrstcs n shft procss Stabl tm Fluctuaton ntral Spd trnd Status Polyln Status Gntly roundd As shown n Fgur and Fgur 3, durng th synchronzng prod, th ntal xctaton currnt of th magntc clutch s largr n Fgur, and th chang rat of th xctaton currnt s also largr. Th rsults ar, th spd chang n Fgur 3 s smoothr than that n Fgur, and th mpact s smallr. Synchronzng componnt charactrstcs ar shown n Tabl durng th upshft procss. As shown n Fgur 3, th rducton of th ntal xctaton currnt and th currnt chang rat of magntc clutch maks synchronzaton tm xtndd, whch rqurs rasonably th sz and chang rat of th ntal xctng currnt n th magntc clutch slppng rang. 493

6 Concluson By jont modlng of th ntrnal combuston ngn, lctrc control synchronzr and magntc powdr clutch durng th procss of shftng, n-dpth analyss of th shftng procss, conducts a thortcal foundaton for th dlopmnt of th shft control systm. Th smulaton analyzs th spd chang of th rlant parts to b synchronzd n dffrnt shft stags and th ffct on th shft qualty by th magntc powdr clutch du to sz changs n th amount of control n th procss of shftng. Th study shows that th ngagmnt stat of th magntc clutch can b adjustd to ffctly mpro shft qualty and hcl prformanc by controllng th xctaton currnt of th magntc clutch. Acknowldgmnt Th projct s sponsord by Changzhou Sc&Tch Program (No. CE055056, Natonal Natural Scnc Foundaton of Chna (No.53057, Natural Scnc Fund projct of Chna (No and Sx Talnt Paks Projct n angsu Pronc (03-ZBZZ-039. Rfrncs: [] Tan Gang, L Guang, Tan nyu. Charactrstc Analyss of Prssur Rgulator Val of 4-spd Powrd-shft Transmsson []. Machn Tool & Hydraulcs, 0, 40(3:55-6. [] Guo Xaoln, Chn Gan, Pan apng. Rsarch on Prssur Control Systm of Dry Dual-clutch Transmsson []. Machn Tool & Hydraulcs, 0, 40(3:5-8. [3] L angjang, You Mngfu. Dsgn of Automatc Transmsson Hydraulc Systm Basd on Logcal Analyss []. Machn Tool & Hydraulcs, 0, 39(0: [4] Sun Dongy, Yn Yanl, Hao Yunzh. Contnuous Powr Shft Control Stratgy of Contnuously Varabl Transmsson Systm wth Rflux Powr []. Chna Mchancal Engnrng, 3(:89-93 [5]Fox Andrw. Dsgn and analyss of a modfd powr-splt contnuously arabl transmsson [D]. Morgantown, Wst Vrgna, USA:Wst Vrgna Unrsty,Collg of Engnrng and Mnral Rsourcs, [6]Gomz Mgul M. A Contnuously Varabl Powr-Splt Transmsson n a Hybrd-Elctrc Sport Utlty Vhcl [D]. Morgantown, Wst Vrgna:Wst Vrgna Unrsty,Collg of Engnrng and Mnral Rsourcs, [7]Chang Sqn, Zhang Lanchun. Powr Splt Contnuously Varabl Transmsson [P]. Chna: Utlty modl patnts , [8]Chang Sqn. Automobl Powr Plant [M]. Bjng: Chna Machn Prss, [9]Xa ngjng, L Chunlang. Vlocty Control of CVT Automot Basd on Engn Brak []. Machn Tool & Hydraulcs0,39 (7: [0]Lu Tanhao, Zhang Xulang. Th Co-smulaton Study of Hydrostatc CVT []. Machn Tool & Hydraulcs 00, 38(9: