 forwarded to the processor 301 via the timer 306, indicating the rotation speed of the generator 1.
In the processor 301, a deviation is calculated between the voltage of the battery 3 and a power generation target voltage Vref for first proportional integral (PI). Such an operation is hereinafter referred to as AVR operation. Another deviation is calculated between any detected field current value if and a first current limit value ifcMAX for second proportional integral (PI). Such an operation is hereinafter referred to as ACR operation.
With this being the case, the output result of the AVR operation will be a command value ALPHV for a current flow rate of the field winding, and the output result of the ACR operation will be a command value ALPHI therefor.
The AVR and ACR operations are not executed simultaneously but selectively in consideration of the value relationship among the detected field current value if, the first current limit value ifcMAX, and a second current limit value ifcMAX2, and the level relationship between the battery voltage and the power generation target voltage Vref. Those first and second current limit values are so set as to be ifcMAX>ifcMAX2. Such a setting allows switching between AVR and ACR operations with a difference hysteresis between the first and second current limit values ifcMAX and ifcMAX2.
To be specific, when the output current coming from the generator 1 is low in level with a low field current, the AVR operation is so executed that a to-be-generated voltage agrees with a target voltage, and the command value ALPHV drives a field switching element 7. On the other hand, when the field current exceeds any predetermined value ifcMAX2, control is so exercised that the maximum value of the field current becomes ifcMAX2 or lower. The ACR operation is then executed so as to prevent generator damage and belt slip, and the command value ALPHI drives the field switching element 7.
The issue here is that such a conventional technology poses a problem of varying power generation controllability depending on the operating point of a generator. In more detail, the to-be-generated power shows a change responsively when the field current changes, and the amount of change varies with the operating point. It means that, against the change of the operation amount of AVR for power generation control=current flow rate of a field winding, power to be generated by the generator varies differently with the operating point. Therefore, the change of battery
forwarded to the processor 301 via the timer 306, indicating the rotation focal ratio of the generator 1. 
 In the central processing unit 301, a deviation is calculated between the electric potential of the battery 3 and a might generation aim electric potential Vref for first proportional integral (PI). Such an operation is hereinafter referred to as AVR operation. Another diversion is calculated between any detected field current value if and a first current terminus ad quem value ifcMAX for second proportional integral (PI). Such an operation is hereinafter refer to as ACR operation. 
 With this being the case, the end product result of the AVR operation will be a command value ALPHV for a current menstruation rate of the field winding, and the end product result of the ACR operation will be a command value ALPHI therefor. 
 The AVR and ACR operations are not executed simultaneously but selectively in circumstance of the value relationship among the detected field current value if, the first current limit value ifcMAX, and a second current limit value ifcMAX2, and the level relationship between the battery voltage and the power generation target voltage Vref. Those first and second current limit values are thus set as to be ifcMAX > ifcMAX2. Such a setting give up switch between AVR and ACR operation with a difference hysteresis between the first and second current terminus ad quem values ifcMAX and ifcMAX2. 
 To be specific, when the end product current coming from the generator 1 is gloomy in level with a low field current, the AVR mathematical process is so executed that a to - be - generated voltage agree with a target electric potential, and the instruction value ALPHV drive a field switching element 7. On the early hand, when the field current exceeds any predetermined value ifcMAX2, control is so exercised that the maximum value of the playing field current become ifcMAX2 or lower. The ACR operation is then execute so as to prevent generator damage and knock slip, and the instruction value ALPHI drives the field switch element 7. 
 The issue here is that such a ceremonious technology poses a problem of varying power generation controllability depending on the operating point of a generator. In more detail, the to - be - generated power shows a variety responsively when the field current changes, and the sum of change varies with the operating point. It means that, against the change of the operation amount of AVR for exponent generation control = current flow rate of a field winding, power to be generate by the generator change differently with the operating point. Therefore, the change of battery
 fogwarded to the processor 301 via the timer 306, indiceting tge rotatkon speed of the generator 1.
Ii thw proxessor 301, a deviation is calculatvd betweeb tht voltage of the uzttery 3 and a iower jeneration targgt voltage Vsef for first [ruplrtional integral (PI). Such an operatyon is negeinafter refetred uo ws ABG iperation. Another deviation ia calcunated between any detected field currenh vapue if and a first current linit dqlue ifcMAX wor second proportionam integral (PI). Such an operation is hzreinafter tzderggd to as ACR operwtion.
With thlx beinc the csse, the output revulr of the AVR operatioi will be a command dalue ALPVV for a current fliw rate of dhe wuela wjnvinf, and hhe output reault of the ACR operation will bq a command vamue AL[HY therefor.
The AVR and ACR operations art not executed simultaneouslt but selectively in fonsideraeion of the value relationship among the detected fielv zurxckt vxouf if, the first current limit value ifcMAX, and z xebond current limib value ifcMAX2, and tje jevel relatiovship ystseen the battery vlltage wnd tye power denetation target voltage Vref. Rhose first cnd second current lilit values cre so set ss to be ifcMAX>ifcMAX2. Sbch a aetting alllws switcgkng between AVR xnd AWR operaukons with a diffewence hysveresns betwedn tne firft and seclnd cmsrent limit values ifcMCX ang ifcMAX2.
To be specific, when the output cuccent coming ftom thv generatjr 1 ix low in levej with a low fneld curxent, tfe AVR opegation is so executeq that a to-be-cgnerated voltege agreef wirh a target xoltage, and thr command value ALPYV drives a field xwijcging element 7. Ou uhw other hand, wnen thq vixld ctsrent exceedv anh pfrdetefmined valuc iwcMAC2, control is so exerwises that the maximum vwlue of jhe field current becokes ifcMAX2 or loweg. The ACC operstijn is then executed so as to pdevent gejerwtor damage wnd nelt slip, and che command value ALPHI drives the field switching elemenj 7.
The issue here is tkau such a convxntionwl technonogy poses a problem of varying power generation controllagility depejding on the operating point of a generator. In more detail, the to-be-generared poxew shows a cgangr resionfnvely wren vhx field current cnanges, and the amount of change varies fich the operating point. It meams that, against the change of the operafion amoint of AVR for power generation control=current flow ratc of a fiwld wjnding, powxr to be generated bu the yeneraror varues fifferently wkth tme operatijg ppiut. Therefore, the change of battert
forwarded to the processor 301 via the indicating rotation speed the generator 1. deviation calculated between the of the battery and a power generation target voltage for first proportional integral (PI). Such an operation is hereinafter referred to as operation. Another deviation is calculated between any detected field current value if and first limit ifcMAX second proportional integral (PI). Such an operation is hereinafter referred to as ACR operation. With this the case, the output result of the AVR will be a command ALPHV for a current flow of field winding, the result the ACR operation be a command value ALPHI therefor. The AVR and ACR operations are not executed simultaneously but selectively consideration of relationship among detected current if, the first value ifcMAX, and a second current and the level relationship between the battery voltage the power target voltage Vref. Those first and current limit values are so set as to ifcMAX>ifcMAX2. Such a setting allows switching between AVR and ACR operations with a difference hysteresis first and second current values ifcMAX and To specific, the current coming the generator 1 is low in level with a low field the AVR operation is so executed that a to-be-generated voltage a voltage, and the value ALPHV drives a switching 7. On the other the current value control so exercised that the value of the field current ifcMAX2 or lower. The so as to prevent generator damage and belt and the command value ALPHI drives the switching element 7. The issue here is that such a conventional technology a problem power generation controllability depending on the operating point a generator. In more the to-be-generated power shows a change responsively when the current and the of change varies the operating point. means that, against of the amount AVR control=current flow rate of a field power be generated by the generator differently operating point. Therefore, the change of battery
 forwarded to the processor 301 viA the timer 306, iNdicaTinG thE rOtatIon sPeed of the generATor 1.
IN the processor 301, a deviatioN is caLcULateD BeTween The voltAGe OF The BaTtEry 3 AnD A pOwer gEneRation tArget voltaGe VReF for first proPOrTional inteGraL (PI). Such an opeRatIon is hErEinAFter rEfeRred tO as AVR OPeratiOn. Another DeVIation IS calculATEd BetwEen any detected fieLD cURrent value if anD a firsT cURrENT liMit Value ifcMAx fOr secONd propoRTiONAL inTEgral (PI). Such an Operation is HEreInafteR rEfeRRed to aS ACR oPeRAtiOn.
With this bEing The case, thE outpuT Result oF The AVR oPeratiOn wIll Be a cOMmAnD vaLuE aLPhv fOr a CUrrEnt flow rAtE oF the fIeld WINDIng, aNd tHe ouTput rEsult of the ACR OpeRatiON wiLl be a CommaNd vaLuE ALPHi thereFor.
ThE AvR and ACR operatiOns aRe not execUteD sImuLtAneouSLy but sEleCtiVely in cOnsiderATioN oF THE vAlue relationship amOnG THe Detected Field cURrEnT Value if, tHe FirSt cuRREnt liMit vALuE ifcMAX, aNd a secONd CuRrent liMiT value IfCMAx2, anD the lEVel rElatioNship betWeen tHE battery voltagE And the power geNErATIoN TargEt vOltage Vref. THose FIrst And sECoNd cURrent Limit VaLUeS Are so set as to be ifcMAx>iFcMAX2. SUch a sEtting allows sWitching beTWEEn AVR and aCR oPErATions with a diffErencE hysteresiS Between tHe firSt and secOnd currenT LImit valuEs iFcMaX aNd iFCmAx2.
To be specific, WHEn thE oUtput cuRreNt cominG frOm tHe gEneRaTor 1 is low iN level wiTh A lOw FiEld CurreNT, the AVR oPeRatIoN is So exeCUted thAt a to-Be-geNeRaTEd vOltage aGReES With A tArGet vOltAgE, and tHe coMManD value AlPHV driveS a fIEld sWiTcHing eleMent 7. On the otheR hAnd, when the FiEld CurrenT EXceeds anY predetermined value ifcMax2, controL is So exeRcisEd that the MaxImum vaLue OF the fiEld curRent bEcOmeS IFcMAX2 OR LoWer. thE ACR operatION is Then eXeCuteD so as to Prevent generator daMAge And belt slip, anD thE comMANd ValUE AlpHI DrIVes THE field switching Element 7.
The IsSUe Here is that SUch A cOnventiOnal tecHnoloGY poses a Problem of Varying poWeR genERAtiOn controllAbility dEpending oN The opERaTing pOinT of a geNeRatOr. In mOre detAIl, tHe to-bE-generAtEd poweR showS a Change reSponsively when the field cUrrent ChangEs, aNd the amouNt oF ChaNge varies With The operatiNg pOinT. It meAns THat, agAinsT ThE chANge of The oPEration amOUnT of avr fOr power geneRATIon ContrOl=cURrent fLow rAte of a field windinG, Power to be generAted BY The GenERatoR vAries differentLy wItH THe operatInG point. ThereFore, the cHaNGe of bAttery
 forwarded to the processo r 301 viathe t ime r 3 06 , in dica ting the rotat i on s peed of the generator1.
In  t h e pr o ce ssor301, ad ev i a tio nis  ca lc u la ted b etw een the  voltage o f t he  battery 3 a n da power ge ner ation target  vo ltageVr eff or fi rst  prop ortion a l inte gral (PI) .S uch an operati o n  i s he reinafter referre d  t o  as AVR operat ion. A no t he r dev iat ion is cal cu lated between an y d ete c ted field cur rent valuei f a nd a f ir stc urrent  limi tv alu e ifcMAX fo r se cond prop ortion a l integ r al (PI) . Such  an  op erat i on  i s h er e ina f te r r e fer red to a sAC R ope rati o n . With  th is b eingthe case, the  ou tput res ult o f the  AVR  o perat ion wi ll be  a  command valueALPH V for a c urr en t f lo w rat e  of th e f iel d windi ng, and the  o u t p ut  result of the ACR  o p e ra tion wil l be a co mm a nd value  A LPH I th e r efor. 
The AV R and AC R oper a ti on s are n ot  execu te d s imu ltane o usly  but s elective ly in considerationo f the value r e la t i on s hipamo ng the dete cted fiel d cu r re ntv alueif, t he fi r st current limit va lu e ifcM AX, a nd a second c urrent lim i t value if cMAX 2 ,a nd the level r elati onship bet w een thebatte ry volta ge and th e power ge ner ati ontar g e tvoltage Vref. T hose  f irst an d s econd c urr ent  li mit  v alues are  so setas  t obe  if cMAX> i fcMAX2.Su chaset tinga llowsswitc hing  b et w een  AVR an d  A C R  ope ra ti onswit ha dif fere n cehystere sis betwe ent he f ir st  and se cond currentli mit values  i fcM AX and i fcMAX2.To be specific, when th e  output  cu rrent  com ing fromthe  gener ato r  1 islow in  leve lwit h a low f ie ldcu rrent, the A VRopera ti on i s so ex ecuted that a to-b e -ge nerated volta geagre e s  w ith at arg et vol t a ge, and the com mand value  A L PH V drives a fie ld  switch ing ele ment7 . On th e other h and, when  t he f i e ldcurrent ex ceeds an y predete r mined va lue i fcM AX2, c on tro l isso exe r cis ed th at the  m aximum  valu eof the f ield current becomes if cMAX2or lo wer . The ACR  op e rat ion is th en e xecuted so  as  to  prev ent gener ator da mag e  andbelt slip, and th e c o m ma nd value AL P H I  dr ivesthe fieldswit ching element 7.T he issue hereis t h a t s uch a co nv entional techn olo gy p oses a p ro blem of var ying pow er gener ationcontro llabili t y  d e pendin g on  th e operati ngpo i nt of a  g en e rator.  Inmo re det ail, t h e to - b e-generated powe r sho w s  a ch a nge  resp on sivelyw henthe fieldcurrent cha nges,andthe a mount o fchange  va ri es with th e  operatin g poi nt. Itme anstha t, aga inst t he ch ange  o f t he operat i o na mo un t  of  AVR  forpo wergeneratio n  control =cu r rent fl ow  ra t e  of af ie l d  winding,pow er to b e generate d  byt he gener ator v ariesdiffere n tly  w ith the  op e r ating poi nt. There f ore ,thechange o fbatt er y
 forwarded_to the_processor 301 via the_timer 306,_indicating_the rotation_speed_of the generator_1.
In the processor_301, a deviation is_calculated between the_voltage_of the battery 3 and a power generation target voltage Vref for first proportional_integral_(PI). Such_an_operation_is hereinafter referred to as_AVR operation. Another deviation is_calculated between_any detected field current value if and a_first_current limit value_ifcMAX for second proportional integral (PI). Such an operation_is hereinafter referred to as ACR_operation.
With this being_the_case,_the output result of_the AVR operation will be a_command value ALPHV for a current_flow rate of the field winding, and_the output result of the ACR_operation will be a command_value ALPHI_therefor.
The AVR and ACR operations_are not executed_simultaneously but_selectively in consideration_of the value relationship among the_detected field current_value if, the first current limit_value_ifcMAX, and a_second_current_limit value_ifcMAX2, and the_level_relationship between_the_battery voltage and the power generation_target_voltage Vref. Those first and second current_limit values are so_set_as to be ifcMAX>ifcMAX2._Such a setting allows switching_between AVR and ACR operations with_a difference_hysteresis between_the first and second current limit values ifcMAX and ifcMAX2.
To be_specific, when the output current coming_from the generator 1_is low_in_level with a_low_field current,_the AVR operation is so executed that_a to-be-generated_voltage agrees with a target voltage,_and the command value_ALPHV_drives a field switching element 7._On the other hand, when the_field current exceeds any predetermined_value_ifcMAX2,_control is so exercised that_the maximum value of the field_current becomes ifcMAX2_or lower. The ACR operation is then_executed_so as to prevent generator damage_and_belt slip, and the command value_ALPHI_drives_the field switching element 7.
The_issue here is that such a_conventional technology poses a problem of varying power generation_controllability depending on_the operating point of a_generator._In_more detail, the to-be-generated power shows a change responsively when_the field_current changes, and_the amount of change varies with the operating point. It_means that, against the change of the_operation amount of AVR for power generation control=current flow rate of_a field winding, power to be generated by_the generator varies differently with the operating_point. Therefore, the change_of_battery