council direct august approxim law member state relat measur emiss pollut diesel engin vehicl eec council european commun regard treati establish european econom commun articl thereof regard propos commiss regard opinion european parliament regard opinion econom social committe technic requir motor vehicl satisfi pursuant nation law relat inter alia emiss pollut diesel engin vehicl requir differ member state member state adopt requir addit place exist rule order eec type approv procedur subject council direct februari approxim law member state relat type approv motor vehicl trailer appli respect type vehicl desir follow technic requir adopt econom commiss europ regul uniform provis approv vehicl equip diesel engin regard emiss pollut engin annex agreement march adopt uniform condit approv reciproc recognit approv motor vehicl equip part adopt direct articl purpos direct quot vehicl quot mean vehicl diesel engin intend road bodywork wheel maximum design speed exceed km except vehicl run rail agricultur tractor machin public work vehicl articl member state refus grant vehicl eec type approv nation type approv ground pollut emit diesel engin drive vehicl engin compli annex ii iii iv vi articl member state grant type approv measur ensur inform modif part characterist refer item annex compet author member state decid fresh test carri modifi vehicl fresh report drawn test reveal failur compli direct modif approv oj doc eec eec tran rev add articl amend adjust annex account technic progress adopt accord procedur laid articl council direct februari approxim law member state relat type approv motor vehicl trailer articl member state put forc provis need order compli direct eighteen month notif forthwith inform commiss thereof notif direct effect member state ensur commiss inform time submit comment import law regul administr provis envisag adopt field cover direct articl direct address member state brussel august council presid westerterp annex definit applic eec type approv symbol correct absorpt coeffici specif test conform product definit purpos direct quot vehicl type limit emiss pollut engin quot mean motor vehicl differ essenti respect vehicl engin characterist defin annex ii quot diesel engin quot mean engin work compress ignit principl quot cold start devic quot mean devic oper temporarili increas amount fuel suppli engin intend facilit start engin quot opacimet quot mean instrument continu measur absorpt coeffici light exhaust gase emit vehicl applic eec type approv applic approv submit vehicl manufactur duli accredit repres accompani underment document triplic particular ath text annex similar regul econom commiss europ breakdown item reason item regul counterpart direct number bracket token entri descript engin type includ particular refer annex ii draw combust chamber upper face piston engin equip prescrib annex ii regul fit vehicl approv submit technic servic conduct approv test defin item manufactur request technic servic conduct approv test agre test carri vehicl repres vehicl type approv eec type approv certif conform shown annex attach eec type approv certif symbol correct absorpt coeffici vehicl conform vehicl type approv regul affix conspicu readili access place annex type approv certif shown annex symbol rectangl surround figur express correct absorpt coeffici obtain time approv test free acceler determin time approv method item annex iv symbol legibl indel annex ix symbol specif test gener compon liabl affect emiss pollut design construct assembl enabl vehicl normal vibrat subject compli provis direct specif cold start devic cold start devic design construct brought action engin run provis item appli condit met light absorpt coeffici gase emit engin steadi speed measur method annex iii cold start devic oper limit prescrib annex vi keep cold start devic oper engin stop reason time specif emiss pollut emiss pollut vehicl type submit approv measur method annex iii iv relat test steadi speed test free acceler emiss pollut measur method annex iii exce limit prescrib annex vi aa test free acceler carri order provid refer figur administr method check vehicl case engin exhaust driven supercharg absorpt coeffici measur free acceler exce limit prescrib annex vi nomin flow maximum absorpt coeffici measur test steadi speed equival measur instrument allow instrument annex vii proof equival engin consid requir conform product vehicl seri conform regard compon affect emiss pollut engin vehicl type approv gener rule conform vehicl approv type emiss pollut diesel motor verifi basi descript annex eec approv certif shown annex addit check carri vehicl seri test carri vehicl run subject test free acceler annex iv vehicl deem conform approv type absorpt coeffici determin exce figur shown approv mark figur determin test refer item exce figur shown approv mark vehicl type consid engin subject test steadi speed full load curv annex iii emiss level exce limit prescrib annex vi annex ii gt pic file quot quot quot pic file quot quot gt gt pic file quot quot gt annex iii test steadi speed full load curv introduct annex describ method determin emiss pollut steadi speed full load curv test carri engin vehicl measur principl opac exhaust gase produc engin measur engin run full load steadi speed measur made engin speed space uniformli maximum power higher engin speed cent engin speed maximum power rpm extrem point measur situat limit interv defin case diesel engin fit air supercharg engag engin entri oper air supercharg automat bring increas quantiti fuel inject measur made supercharg work engin speed result measur higher figur obtain test condit vehicl engin engin vehicl submit good mechan condit engin run engin test equip annex ii set engin manufactur annex ii exhaust devic orific gase emit engin dilut engin normal work condit prescrib manufactur cool water oil normal temperatur manufactur fuel fuel refer fuel specif annex test laboratori absolut temperatur laboratori express degre kelvin atmospher pressur express torr measur factor determin formula gt pic file quot quot gt sampl measur apparatu light absorpt coeffici exhaust gase measur opacimet satisfi condit laid annex vii instal conform annex viii limit valu engin speed absorpt coeffici measur pursuant paragraph nomin ga flow express litr calcul mean formula gt pic file quot quot gt cylind capac engin express litr engin speed revolut minut engin speed absorpt coeffici exhaust gase exce limit tabl annex vi nomin flow tabl limit applic obtain interpol principl proport part annex iv test free acceler test condit test carri vehicl engin undergon test steadi speed annex iii engin test bench test carri test measur opac full load steadi speed cool water oil normal temperatur manufactur test carri stationari vehicl engin brought normal oper condit road run test carri complet road run combust chamber cool foul prolong period idl preced test test condit annex iii item appli condit annex iii item regard sampl measur apparatu appli test method test bench test engin disconnect brake replac rotat part driven gear engag inertia substanti equival rotat part test carri vehicl gear chang control set neutral posit engin gear engin idl acceler control oper quickli violent obtain maximum deliveri inject pump posit maintain maximum engin speed reach governor action speed reach acceler releas engin resum idl speed opacimet revert condit oper item repeat time order clear exhaust system adjust apparatu maximum opac valu read success acceler note stabil valu obtain account valu read engin idl acceler valu read regard stabil consecut read situat band width form decreas sequenc absorpt coeffici xm record arithmet valu engin fit air supercharg subject special requir case engin air supercharg coupl driven mechan engin capabl disengag complet measur cycl preliminari acceler carri air supercharg engag case disengag measur result record higher result obtain case engin air supercharg cut mean driver oper bypass test carri bypass measur result record higher result obtain determin correct absorpt coeffici notat xm absorpt coeffici free acceler measur item annex xl correct absorpt coeffici free acceler sm absorpt coeffici measur steadi speed annex iii item closest prescrib limit nomin flow sl absorpt coeffici annex iii item nomin flow point measur gave sm effect length light path opacimet absorpt coeffici express effect length light path metr correct xl smaller express gt pic file quot quot gt annex specif refer fuel prescrib approv test verifi conform product gt pic file quot quot gt note fuel base straight run distil hydrodesulphur addit annex vi limit valu applic test steadi speed gt pic file quot quot gt note valu round nearest measur made degre accuraci annex vii characterist opacimet scope annex defin condit met opacimet test annex iii iv basic specif opacimet ga measur confin enclosur reflect intern surfac determin effect length light path ga account influenc devic protect light sourc photoelectr cell effect length instrument gt pic file quot quot gt construct specif gener design steadi speed oper condit smoke chamber fill smoke uniform opac smoke chamber opacimet case imping photoelectr cell strai light due intern reflect diffus effect reduc minimum finish intern surfac matt black suitabl gener layout optic characterist combin effect diffus reflect exce unit linear scale smoke chamber fill smoke absorpt coeffici light sourc light sourc incandesc lamp colour temperatur rang ºk receiv receiv consist photoelectr cell spectral respons curv similar photop curv human ey maximum respons rang nm cent maximum respons nm nm construct electr circuit includ indic dial current output photoelectr cell linear function intens light receiv oper temperatur rang photoelectr cell measur scale gt pic file quot quot gt method item annex correl type opacimet effect length relationship linear scale light absorpt coeffici formula gt pic file quot quot gt read linear scale absorpt coeffici indic dial opacimet enabl absorpt coeffici read accuraci set test measur apparatu electr circuit photoelectr cell indic dial adjust pointer reset light flux pass smoke chamber fill clean air chamber ident characterist gt pic file quot quot gt intermedi check carri place smoke chamber screen repres ga light absorpt coeffici measur item check consist verifi differ read opacimet indic dial screen introduc sourc light photoelectr cell opacimet respons respons time electr measur circuit time indic dial reach cent full scale deflect remov screen fulli obscur photoelectr cell damp electr measur circuit initi oversw final steadi read momentari variat input calibr screen exce cent read linear scale unit respons time opacimet due physic phenomena smoke chamber time entri ga measur apparatu complet fill smoke chamber exce provis appli sole opacimet measur opac free acceler pressur ga measur scaveng air pressur exhaust ga smoke chamber differ mm water gaug atmospher pressur variat pressur ga measur scaveng air absorpt coeffici vari case ga absorpt coeffici opacimet equip devic measur pressur smoke chamber limit pressur variat ga scaveng air smoke chamber manufactur apparatu temperatur ga measur point smoke chamber ga temperatur instant measur ºc maximum temperatur opacimet manufactur read temperatur rang vari chamber fill ga absorpt coeffici opacimet equip devic measur temperatur smoke chamber effect length quot quot opacimet gener type opacimet ga light sourc photoelectr cell transpar part protect sourc photoelectr cell constant opac case effect length column ga uniform opac absorpt light obtain ga admit normal opacimet effect length light path obtain compar read opacimet oper read obtain opacimet modifi test ga fill defin length lo compar read quick success determin correct made shift method assess test ga exhaust ga constant opac light absorpt ga gravimetr densiti similar exhaust ga column length lo opacimet fill uniformli test gase end substanti angl light path accur determin length lo close presum effect length opacimet temperatur test ga smoke chamber measur expans tank compact design suffici capac damp pulsat incorpor sampl line probe cooler fit addit expans tank cooler unduli disturb composit exhaust ga test determin effect length consist pass sampl test ga altern opacimet oper apparatu modifi item opacimet read record continu test record respons time equal shorter opacimet opacimet oper read linear scale opac ga temperatur express kelvin degre length lo fill test ga read linear scale opac ga temperatur express kelvin degre effect length gt pic file quot quot gt test repeat test gase give read evenli space linear scale effect length opacimet arithmet effect length obtain state item gase annex viii instal opacimet scope annex specifi instal opacimet test annex iii iv sampl opacimet instal steadi speed test ratio cross section area probe exhaust pipe back pressur measur exhaust pipe intak probe exce mm water gaug probe tube open end face forward axi exhaust pipe extens pipe requir situat section distribut smoke approxim uniform achiev probe downstream exhaust pipe extens pipe diamet exhaust pipe outlet end probe situat straight portion length upstream sampl point length downstream extens pipe air allow enter joint pressur exhaust pipe characterist pressur drop sampl line probe collect sampl substanti equival obtain isokinet sampl expans tank compact design suffici capac damp pulsat incorpor sampl line probe cooler fit design expans tank cooler unduli disturb composit exhaust ga butterfli valv mean increas sampl pressur exhaust pipe downstream sampl probe connect pipe probe cool devic expans tank requir opacimet short satisfi pressur temperatur requir annex vii item pipe inclin upward sampl point opacimet sharp bend soot accumul avoid embodi opacimet bypass valv provid upstream check carri test ensur requir annex vii item pressur annex vii item temperatur measur chamber observ instal test free acceler ratio cross section area probe exhaust pipe back pressur measur exhaust pipe intak probe exce mm water gaug probe tube open end face forward axi exhaust pipe extens pipe requir situat section distribut smoke approxim uniform achiev probe downstream exhaust pipe extens pipe diamet exhaust pipe outlet end probe situat straight portion length upstream sampl point length downstream extens pipe air allow enter joint sampl system engin speed pressur sampl opacimet limit annex vii item check note sampl pressur engin idl maximum load speed depend characterist opacimet control sampl pressur achiev fix restrict butterfli valv exhaust pipe extens pipe whichev method back pressur measur exhaust pipe intak probe exce mm water gaug pipe connect opacimet short pipe inclin upward sampl point opacimet sharp bend soot accumul avoid bypass valv provid upstream opacimet isol exhaust ga flow measur made full flow opacimet gener precaut observ steadi speed free acceler test joint connect pipe exhaust pipe opacimet air enter pipe connect opacimet short case sampl opacimet pipe system inclin upward exhaust pipe opacimet sharp bend soot accumul avoid bypass valv provid upstream opacimet isol exhaust ga flow measur made cool system requir upstream opacimet annex ix symbol correct absorpt coeffici gt pic file quot quot gt annex gt pic file quot quot gt gt pic file quot quot gt