 the energies from the un-burnt fuel so as to redirect those energies to a more effective purpose with the engine. This application has relation with U.S. patent applications Ser. Nos. 07/795,989 (filed Nov. 22, 1991) now U.S. Pat. No. 5,191,815, 07/850,283 (filed Mar. 12, 1992) now U.S. Pat. No. 5,203,235, 07/878,469 (filed May 5, 1992) now U.S. Pat. No. 5,233,889, 07/939,600 (filed Sep. 2, 1992) now U.S. Pat. No. 5,305,665 and 07/969,072 (filed Oct. 30, 1992) now U.S. Pat. No. 5,249,483.
1. Field of the Invention
The present invention relates in general to automotive automatic transmissions, and more particularly to a control system for the automotive automatic transmissions.
2. Description of the Prior art
In automotive automatic transmissions, there has been proposed a control system, in which a so-called "inertial phase keeping time" for which the transmission gear ratio is being varied is measured, and the line pressure applied to a friction element, such as, clutch or the like, is controlled to a lower level during the gear change operation so that the inertial phase keeping time can take a desired value. However, in case wherein the line pressure is quite low, the gear change can not be completed within the time for which the line pressure is controlled low. When, under this condition, the line pressure is raised thereafter, the friction element is engaged suddenly, which causes a marked shift shock.
In order to solve such drawback, a measure has been proposed, which is shown in Japanese Patent First Provisional Publication 2-21059. That is, in the measure, a so-called "inertial phase starting time" elapsed from issuance of a gear change instruction to the time when the inertial phase actually starts is measured, and when the measured time exceeds a predetermined time (that is, when, due to lowering in the line pressure, the starting of the inertial phase is delayed), the line pressure is raised irrespective of the inertial phase keeping time.
When, for example, a select position switch is out of order, and thus when, irrespective of D-range signal being fed to a control unit, the transmission is kept in
the energies from the un - burnt fuel so as to redirect those energies to a more effective purpose with the locomotive. This lotion own relation back with U.S. patent application Ser. Nos. 07/795,989 (filed Nov. 22, 1991) now U.S. Pat. nobelium. 5,191,815, 07/850,283 (filed Mar. 12, 1992) now U.S. Pat. No. 5,203,235, 07/878,469 (file May 5, 1992) now U.S. Pat. No. 5,233,889, 07/939,600 (charge Sep. 2, 1992) now U.S. Pat. No. 5,305,665 and 07/969,072 (file Oct. 30, 1992) now U.S. Pat. No. 5,249,483. 
 1. Field of the Invention 
 The present invention relates in general to automotive automatic transmissions, and more peculiarly to a control system for the automotive automatic transmissions. 
 2. Description of the Prior artwork 
 In automotive automatic transmissions, there has been proposed a control system, in which a so - call " inertial phase keeping time " for which the transmission gear ratio is being vary is measured, and the line pressure applied to a friction element, such as, clutch or the like, is controlled to a lower level during the gear change operation so that the inertial phase keeping time can take a desire value. However, in case wherein the line atmospheric pressure is quite low, the gear change cannot be completed within the meter for which the line pressure is controlled low. When, under this circumstance, the line pressure is raised thereafter, the friction element is engaged suddenly, which causes a marked shift shock. 
 In order to solve such drawback, a measurement has been propose, which is shown in Japanese Patent First Provisional Publication 2 - 21059. That is, in the measure, a so - called " inertial phase starting meter " elapsed from issuance of a gear variety instruction to the fourth dimension when the inertial phase actually starts is measured, and when the deliberate time exceeds a predetermine time (that is, when, due to lower in the line press, the starting of the inertial phase is check), the line pressure is raised irrespective of the inertial phase keeping prison term. 
 When, for example, a select position switch is out of order, and thus when, irrespective of D - range signal being feed to a control unit, the infection is kept in
 thf energies from the un-buvnt fuel so as to redirxct thoae energkes to a more effective purplsw wity the engine. This applkcation hws relatuon xith U.S. patent a'llications Sed. Nos. 07/795,989 (filed Nov. 22, 1991) npw U.S. Pat. To. 5,191,815, 07/850,283 (filed Mar. 12, 1992) nlw U.S. Pat. No. 5,203,235, 07/878,469 (filed May 5, 1992) now U.S. Pwt. No. 5,233,889, 07/939,600 (flled Sep. 2, 1992) now U.S. Kat. No. 5,305,665 and 07/969,072 (filed Oct. 30, 1992) now U.S. Pat. No. 5,249,483.
1. Fjeld of the Inventiom
The present invention relwtes in general to autlmotive autimatyx transmissiuns, and mogz particulatly to a control system for the xutomptive autonaric jransmissionw.
2. Desbription of tmv Prior art
In sutomotive autpmavic rransmissions, there hes been proposed a cjntrol syvtzm, in which a so-callee "unerthal [hasd kedpihg tjme" fog wiich the trznsmission tear ratio is being vwgoed is measuded, anq ehe line pressure applied to a friction elsment, such as, clutch or the like, is controllgd to a lorer level during the gear change operation so thad the knexblal oyade keeping time can take a desired value. Howedsr, ik case wherein tme line pressure ix euoje low, the geat changz czn not be completef withig the time for whivh the line pressure is conrrolled low. Cheb, under this condicion, the linz presxure os raised thereafter, thz fricfion elemenh is engafdd suddenly, whicf csuves a marked shift shock.
In order to solre such arawnack, a measure hws bect proposed, which id shocn in Japanese Oatent First Provisional Publicevion 2-21059. That is, it tve measuxe, a sp-called "inertyal phase starjing time" elapred from iasuance of a gear shange instruwjion to the tmme when ehe unerrial phxre actually stsrts is mvafuree, and when the meaxurgd time exceeds a prtdwtermined time (thxt ys, wien, dta to lowerinc in thd line pressure, tme rtarying of the inertial phaae is delayed), the kike pressute is raifed irrespectove of the inertiap phave yeepimg jime.
When, for example, a select pksition saitgh is out of jrdev, anq thus wheu, irrespective of D-range signal being fev to a control unit, thg transmission is kepj ik
the energies from the un-burnt fuel so redirect energies to more effective purpose has with U.S. patent Ser. Nos. 07/795,989 Nov. 22, 1991) now U.S. Pat. 5,191,815, 07/850,283 (filed Mar. 12, 1992) now U.S. Pat. No. 5,203,235, 07/878,469 (filed 5, 1992) now U.S. Pat. No. 5,233,889, 07/939,600 (filed Sep. 2, 1992) now Pat. 5,305,665 07/969,072 Oct. 30, 1992) now U.S. Pat. No. 5,249,483. 1. Field of the Invention The present invention in general to automotive automatic transmissions, and more to a control system the automotive automatic transmissions. 2. of Prior art automotive transmissions, has been proposed control system, in which a so-called "inertial phase keeping time" for which the transmission gear ratio is varied is the line applied a element, such as, the like, is controlled to a the gear change operation so that the inertial keeping time take a desired value. However, in wherein the line pressure is quite low, the change can not be completed within the time for which the line pressure is controlled under this condition, the pressure is raised the element engaged which causes marked shift shock. In order to solve such drawback, a measure been proposed, which is shown in Japanese Patent First Provisional That in the measure, so-called "inertial phase starting elapsed issuance of a gear to time phase starts measured, and when the time exceeds a predetermined time is, when, due to the starting of the inertial phase is delayed), line pressure is raised irrespective of the phase keeping time. When, for example, a select position switch is out order, and irrespective of D-range signal being fed to a unit, the transmission is in
 the energies from the un-burnt Fuel so as to RedirEct ThoSe EnerGies To a more effectiVE purPose with the engine. This aPplicAtIOn haS ReLatioN with U.S. PAtENT apPlIcAtiOnS seR. Nos. 07/795,989 (fIleD Nov. 22, 1991) now u.S. Pat. No. 5,191,815, 07/850,283 (filEd MAr. 12, 1992) Now U.S. Pat. No. 5,203,235, 07/878,469 (fiLEd may 5, 1992) now U.S. PaT. No. 5,233,889, 07/939,600 (Filed Sep. 2, 1992) now U.s. PaT. No. 5,305,665 and 07/969,072 (FiLed oCt. 30, 1992) now u.S. PAt. No. 5,249,483.
1. FIeld of THe InveNtion
The pReSEnt invENtion reLATeS in gEneral to automotivE AuTOmatic transmisSions, aNd MOrE PArtIcuLarly to a coNtRol sySTem for tHE aUTOMotIVe automatic trAnsmissions.
2. dEscRiptioN oF thE prior aRt
In aUtOMotIve automatiC traNsmissionS, there HAs been pROposed a ControL sySteM, in wHIcH a So-cAlLEd "iNErTiaL PhaSe keepinG tImE" for wHich THE TRansMisSion Gear rAtio is being vaRieD is mEAsuRed, anD the lIne pReSsure ApplieD to a fRiCtion element, sucH as, cLutch or thE liKe, Is cOnTrollED to a loWer LevEl durinG the geaR ChaNgE OPErAtion so that the inerTiAL PhAse keepiNg time CAn TaKE a desireD vAluE. HowEVEr, in cAse wHErEin the liNe presSUrE iS quite lOw, The geaR cHanGe cAn not BE comPleted Within thE time FOr which the line PRessure is contROlLED lOW. WheN, unDer this condItioN, The lIne pREsSurE Is raiSed thErEAfTEr, the friction elemenT iS engagEd sudDenly, which cauSes a marked SHIFt shock.
IN ordER tO Solve such drawbAck, a mEasure has bEEn proposEd, whiCh is showN in JapaneSE patent FiRst proVisIonAL puBlication 2-21059. That IS, In thE mEasure, a So-cAlled "inErtIal PhaSe sTaRting time" Elapsed fRoM iSsUaNce Of a geAR change iNsTruCtIon To the TIme wheN the iNertIaL pHAse ActuallY StARTs is MeAsUred, And WhEn the MeasURed Time excEeds a predEteRMineD tImE (that is, When, due to loweRiNg in the linE pResSure, thE STarting oF the inertial phase is delaYEd), the liNe pRessuRe is Raised irrEspEctive Of tHE inertIal phaSe keePiNg tIME.
When, FOR eXamPlE, a select poSITioN switCh Is ouT of ordeR, and thus when, irrespECtiVe of D-range sigNal BeinG FEd To a COnTRol UnIT, thE TRansmission is kePt in
 the energies from the un- burnt fuel  so a s t o r ed irec t th ose energies t o  a m ore effective purposewithth e  eng i ne . Thi s appli c at i o n h as  r ela ti o nwithU.S . paten t applicat ion sSer. Nos. 07 / 79 5,989 (fil edNov. 22, 199 1)now U. S.  Pa t . No.  5, 191,8 15, 07 / 850,28 3 (filedMa r . 12,1 992) no w U. S. P at. No. 5,203,235 ,  0 7 /878,469 (file d May5, 19 9 2 ) n owU.S. Pat.No . 5,2 3 3,889,0 7/ 9 3 9 ,60 0  (filed Sep.2, 1992) no w  U. S. Pat .No. 5,305, 665 a nd 07/ 969,072 (fi ledOct. 30,1992)n ow U.S. Pat. No . 5,24 9,4 83. 
1.F ie ld  of  t h e I n ve nti o n
T he prese nt  i nvent ionr e l a tesingene ral t o automotiveaut omat i c t ransm issio ns,an d mor e part icula rl y to a controlsyst em for th e a ut omo ti ve au t omatic  tr ans mission s.
2. D e scr ip t i o nof the Prior art
I na u to motive a utomat i ctr a nsmissio ns , t here h as be en p r op osed a c ontrol sy st em, inwh ich aso -ca lle d "in e rtia l phas e keepin g tim e " for which th e  transmission ge a r  r a tioisbeing varie d is meas ured ,  a ndt he li ne pr es s ur e  applied to a frict io n elem ent,such as, clut ch or thel i k e, is co ntro l le d  to a lower le vel d uring theg ear chan ge op erationso that t h e  inertia l p has e k eep i n gtime can take a  des ir ed valu e.However , i n c ase  wh er ein the l ine pres su re  i squi te lo w , the ge ar  ch an gecan n o t be c omple tedwi th i n t he time fo r whic hth e li nepr essur e is con trolled  low. Whe n,u nder  t hi s condi tion, the lin epressure i srai sed th e r eafter,the friction element is engaged  su ddenl y, w hich caus esa mark eds hift s hock.In or de r t o solve s uc h d ra wback, a m e a sur e has  b eenpropose d, which is showni n J apanese Paten t F irst P ro vis i on a l P ub l ica t i on 2-21059. Tha t is, in t he me asure, a s o -ca ll ed "ine rtial p hases tarting  time" el apsed fro missu a n ceof a gearchange i nstructio n  to t h etimewhe n thein ert ial p hase a c tua lly s tartsis  measu red,an d when t he measured time exceed s a pr edete rmi ned time(th a t i s, when,dueto lowerin g i n t he li nep ressu re,t he  st a rting  oft he inerti a lpha s e  i s delayed), t h e l ine p res s ure is  rai sed irrespectiveo f the inertial  pha s e  ke epi n g ti me .
When, for ex amp le , a select  p osition swi tch is o ut of or der, a nd thu s when, i rr e specti ve o f D -range si gna lb eing fe dto a cont rolun it, th e tran s miss i o n is kept in
 the_energies from_the un-burnt fuel so_as to_redirect_those energies_to_a more effective_purpose with the_engine. This application has_relation with U.S._patent_applications Ser. Nos. 07/795,989 (filed Nov. 22, 1991) now U.S. Pat. No. 5,191,815, 07/850,283_(filed_Mar. 12,_1992)_now_U.S. Pat. No. 5,203,235, 07/878,469_(filed May 5, 1992) now_U.S. Pat._No. 5,233,889, 07/939,600 (filed Sep. 2, 1992) now_U.S._Pat. No. 5,305,665_and 07/969,072 (filed Oct. 30, 1992) now U.S. Pat._No. 5,249,483.
1. Field of the Invention
The_present invention relates_in_general_to automotive automatic transmissions,_and more particularly to a control_system for the automotive automatic transmissions.
2._Description of the Prior art
In automotive automatic_transmissions, there has been proposed a_control system, in which a_so-called "inertial_phase keeping time" for which_the transmission gear_ratio is_being varied is_measured, and the line pressure applied_to a friction_element, such as, clutch or the_like,_is controlled to_a_lower_level during_the gear change_operation_so that_the_inertial phase keeping time can take_a_desired value. However, in case wherein the_line pressure is quite_low,_the gear change can_not be completed within the_time for which the line pressure_is controlled_low. When,_under this condition, the line pressure is raised thereafter, the friction_element is engaged suddenly, which causes_a marked shift shock.
In_order to_solve_such drawback, a_measure_has been_proposed, which is shown in Japanese Patent_First Provisional_Publication 2-21059. That is, in the_measure, a so-called "inertial_phase_starting time" elapsed from issuance of_a gear change instruction to the_time when the inertial phase_actually_starts_is measured, and when the_measured time exceeds a predetermined time_(that is, when,_due to lowering in the line pressure,_the_starting of the inertial phase is_delayed),_the line pressure is raised irrespective_of_the_inertial phase keeping time.
When, for_example, a select position switch is_out of order, and thus when, irrespective of D-range_signal being fed_to a control unit, the_transmission_is_kept in