Kungani Isivuthi SeVVT Sibalulekile Kukubeka Amaphuzu?

Ukuthi i-VVT Valve isenzi ukuthi ukubala kwesikhathi sokuphuma kwezinyembezi kusobala ukunciphisa i-NOx

Ukubuyisela kwesikhathi sokuphuma kwezinyembezi kunciphisa izintempelature zokuphuma kwezinyembezi

Kodwa izintemperatura zomoto zizofika phezulu kwezindawo ezingu-2500 degrees Fahrenheit, amakhemikhali ase-Nitrogen oxides (NOx) azoqala ukudala njengesiqhelo sesiphumo sokufa. Amamotolo amahle ayisisekelo ayizofika kulezi zintemperatura ngokuphelele. Le nto yilapho ukuguqula isikhathi sokuvula kwamavavili kuyasebenza. Isistimu se-VVT isoguqula indawo yomshini wokuvula ukuze isholoke lapho amavavili avula neyakha ngalokho kuzo konke isikhathi somoto. Ngeminyaka apho umoto uyasebenza ngokukhulu, ukugcina ukuvula kwamavavili okuvula kuyabeka phansi loyo uhlobo lwesiphumo sokubeka phansi kwesiphumo sokubeka phansi. Lokhu kubeka phansi lezi zintemperatura zezindawo zokufa ngo-200 ku-300 degrees Fahrenheit. Isiphumo? Ukufa kusobala phansi kwesiphumo sokubeka phansi sokudala kwe-NOx futhi kusobala nokuthi umoto uyasebenza ngokuphelele. Abasemthethweni abakhulu baveza kuzivumela lokhu ngokujwayelekile. Idatha yabo ibonisa ukuthi kunezinkulungwane ezingu-40% ku-60% zezinhlobo zama-NOx ezingenakho emoto yezitrofhu engeziwe noma yiziphi izisitemu ze-VVT ezihle. Lokhu kusiza ukuthi kuhlanganiswe nezimthetho zika-Euro 6 ezinamandla ngaphandle kokuthi kubhekwe kwezinye izinto zokugcina emoyeni.

Ukubuyisa kwamafutha okuphuma ngokusebenzisa i-valve yokuqondisa i-VVT (iEGR) ngokusebenzisa ukulandela ukugcina

Kodwa izivali zokufaka nokukhupha zivula ngokufanayo ngexesha lokuvula kwezivali (okuchazwa ngokuthi valve overlap), isistimu ye-VVT isivumela amagasi okukhupha ukubuyiselwa ngaphakathi kwemotora (lokhu kuchazwa ngokuthi internal EGR noma iEGR). Lokhu kusebenza ngokugcina lezivali zivulile kude ukuze amagasi esedlulayo abuyiselwe emseleni apho abambisana nezinkambo zomshini ne-ayir. Okusemva kwalokho kuyabonakala kahle - lemagasi abuyiselwe kuyasebenza ngokulowula inombolo yamandla we-oxygen eyafanele ukusobala futhi kuyalowula ukungena kwezintando. Ngokuhlaziywa, izintando zokusobala zihlala phansi kusukela ku-150 ku-250 degrees Fahrenheit. Izistimu ze-EGR zezinhloso zingadinga iziphiphi nezihose zonke ezihamba ngemuva kwemotora, futhi zinethime yokurepondza xa izimo zihlala ziyishintsha. Kodwa nge-iEGR ephindwe ngokwe-VVT, isistimu isinika inkulumo ngokushesha kakhulu, isinika impendulo ngemizuzwana emibili nje. Amathesiti emhlabeni wasebenzi wabonisa ukuthi imitshato eyisebenzisa lokhu kulwa kuyaproducisa amagasi we-nitrogen oxides angu-35% ngaphansi kwezikhathi zokuphanda okunengxenye yezibalo zokuphanda ngokulinganayo kuma-motora othile ozilungileyo. Kuma-manufacturers othanda ukudayisa izimfuneko eziningi zokuhlanza amagasi njenge-EPA Tier 3, lokhu kulwa kuyenza umphumela omkhulu.

Ukuvuselela Kwalokho kwe-Valve ye-VVT ukusukela kwezinkinga zokugcina kwezinye zezindawo zokugcina nokubuka kwezinkampani zokugcina

Ukuqhubeka ngokuphakamisa ukuzama kwezinkampani zokugcina ngokuhambisana kwezinye zezindawo zokufuna/zokugcina

Kodwa izimoto zizwa ngezinye zezindawo zokugcina, i-VVT valve iyasebenza ngendlela enjalo ngokuguqula isikhathi sokuvula nokuvulwa kwezinye zezindawo zokufuna nokugcina. Lokhu kuyabeka izifumo zokugcina ezinomoya omubi ngaphansi kokuthi ziyakhuluma ngokwesibonelo kwezinkampani zokugcina, kusiza kuzama kahle kunezinye izikhathi. Ngokwenziwa kwezikhathi ezifanele, izinkampani zokugcina zifika ekuthi ziyabuka ("light-off") isikhathi sokuzama, lapho zizama ngokuphelele izinkinga zokugcina ezingcono, ngokuphakeme kwezilinganiso ku-40%. Futhi lokhu kubaluleke kakhulu ngoba izimoto zihambisana phakathi kwe-60% ne-80% yezinkinga zokugcina zabo zizwa ngezinye zezindawo zokugcina kodwa zizwa ngezinye zezindawo zokugcina zokuzama kwezinkampani zokugcina.

Isiphumo esikwamanje: Ukuhlukunyezwa kwezinkinga zokugcina zokugcina ngokuphakeme kwe-40–60%

Ukuchaza kubonisa ukuthi lapho isikhathi sokuvula okungathinti (VVT) sivulwe ngokuphelele, kungakwazi ukunciphisa lezi zinhlobo zemisipha yezinkampani zemithali zokushisa ngokugcwele emva kokuvula indawo engafika kusukela kwe-40 ku-60%. Lokhu kuyenza umehluko omkhulu manje, ikakhulu ngezimboni zokuqala ze-Euro 7 ezizofika. Izivulayo zokushisa kuzisa ziyagcina izinyathelo ezingaphezu kwezintathu zezinyathelo ezifanele ukufinyelela ukuthi izindustria zihlanganise ngalezi zimboni. Lokhu okuthi kusebenza kuyinto esibalulekile ngoba uma indawo ayikwazi ukudla konke ukudla ngokuphelele lapho kuyashisa, lokho okungadliwa kuya kusuka ngendlela yokuqala. Izisiko zesikhathi sokuvula esihle sizikhubaza lokhu, okuthi kungabikho amasipha amahle angaphansi kwezindawo zethu zokuhamba futhi kusiza ekubambeni izinkinga zokushisa okuthi kubonwa emazweni ethu.

Inqubo Yomthwalo We-VVT Ekubambeni Izimboni Zokugcina Emhlabeni

Ukuvumela ukuthi kufinyelelwe i-Euro 7, i-China 6b, ne-EPA Tier 3

Imithwalo yezinyathelo zokuphuma kuzo manje iyadinga ukulawula ngokuphelele indlela okwenza ngayo amoto ukuphuma kwamafuel. Le nto yisikhundla sesiVVT valves sokuthi singakwenza ukuthintela usuku lwezinyathelo zokuvula nokuzala, okusiza ekukhishoneni kwezinto ezingavumelekile njenge-nitrogen oxides (NOx) nezinkambu zomthwalo. Faka isibonelo soku-Euro 7, leyo iyadinga ukuthi kubhekwe izinyathelo zokuphuma zika-NOx ngemibili yezinyathelo zokuphuma zika-Euro 6. Izinhlangano ze-VVT zihlola le ndlela ngokuphelele ngokulawula okufanele kuchazwa njenge-internal exhaust gas recirculation. Lokhu kuyafana nesiphumo se-China 6b esilawulwa emaphakathi emagugu, futhi imithwalo ye-EPA Tier 3 eyidinga ukuthi izinyathelo zokuphuma zama-hydrocarbons zizame ngemibili yezinyathelo zokuphuma zika-80%. Lokhu wonke kuyaphatha ngokuphelele kuteknoloji ye-VVT ukuze kuhlolwe ukuthi kuneqiniso lokugcina ukuthi kunezinyathelo zokuphuma zokudliwa nezinyathelo zokuphuma zokudliwa nakuba kunezimboni zokuphuma zokudliwa ezinguqukile kakhulu. Ukuthi kuneqiniso lokugcina ukuthi kunezinyathelo zokuphuma zokudliwa nezinyathelo zokuphuma zokudliwa kuyisigaba esibalulekile uma abaprositha badinga ukuthi izihlombe zabo zihlola zonke le mithwalo yezinyathelo zokuphuma zokudliwa zokuhamba kwezizwe zonke.

Ukuxhumana kokuchaza: Indlela okungafani ngayo kwezinyathelo ze-VVT kuyenza ukuthi i-P0011 ibe yisibonelo futhi kuyabuka i-P0420

Kodwa uma izisifundo se-VVT ziphuma, zibhekisa indlela yezinkinga ezinamandla okungahleli kuzo zokuphatha kwezinye izinto ezinamandla, futhi zihlukise amathuluzi okuphatha kwezinye izinto ezinamandla. Uma ivavha ye-VVT ibekwe noma ishalela ngokushesha kakhulu, kuyabhekisa ikhowudi ye-P0011 yokuqondana kwezikhathi zomkhakha wokubhala, okufanayo nokuba kunezikhathi zokubhala zokuphakama kakhulu. Lokhu kufana nokuba akukho uphawu lwe-oli lomkhakha olwenzelwa noma kukho into engafanele kwi-solenoid. Isiphumo? Ukubhala okungafanele kuphela, apho isiliza asibhali kahle, futhi sibhala izihlukanisi zezinkulungwane ezingasibhalanga ku-system yokuqonda. Lezi zinhlobo zokubhala ziyabhekisa i-catalytic converter ngaphezu kwezidingo zakho. Uma i-converter ishalela ukusebenza kahle, sizobhekisa ikhowudi eyodwa: i-P0420 ekhombisa ukuthi umsebenzi wako wokubhala awusizi kakhulu. Ukuhlakanipha kubonisa ukuthi lezi zinhlobo zokuphuma kuzo ziyabhekisa ukubhala kwezinkulungwane ngaphezu kwe-200% ukuze kube ngaphezu kwe-400%, okubonisa ukuthi kuhlanganiswa nezidingo ze-Euro 7 futhi nezidingo ze-EPA Tier 3. Ukubeka lezi zikhodi zokuphuma kwe-VVT kusasa kuyasebenza kumaphuzu amaningi. Akukho kuphela ukuvikela ukuthi ubhekwe ngokungafanele ngabaphathi, kodwa futhi ukuthinteka kwezimali emva kwalokho uma izinqubo zokubhala eziningi ziyadingeka ukubuyiselwa.

Ukubalansisa Ukuthabatha Kwemithombo Yokuqinisa Nokuthintana Kwezindlela Zokusebenza Zevavili Yase-VVT

Ukusebenza kwe-VVT valve kubhekise ngokupheleleyo ukugcina izimpilo zokugcina, ngokuvamile ukunciphisa izi-hydrocarbons zokugcina kwisikhathi sesibhakabhaka ngokupheleleyo ngo-60%. Kodwa kukho isibonelo. Le sistimu ineeda ukuthi ipresha yomoto iyisikhathi esifanayo nokuvimba okufanele ukuze le valves zisikhathi ngokupheleleyo. Uma ubheka lokhu okungafanele, sizobona iziproblemi zemisolenoid noma iziproblemi zezivavanyi zomoto. Abamekhaniki bakhona lokhu konke isikhathi. Lezi ziproblemi zokusebenza ziyasho ngokuvamile ngamakholi amanquma njenge-P0011, futhi uma zihlaziywa, zingalwazi kuzo iziproblemi ezenzima kakhulu njengekukhula kwesistimu yokuqhubeka (ikholi elinombolo P0420). Lokhu-ke kuyisizathu sokuthi ukuchaza kwezinsiza kubalulekile kakhulu. Sebenzisa lokho okuchazwa ngumthwala wokusebenza ngokuhambisana nezinkampani ngokuhambisana nomoto nokuthi kufanele ukushintsha umoto ngiziphi izikhathi. Futhi lapha kukho okunye okunempela: ngaphandle kokuzinye iziproblemi, amabhasi ene-VVT systems esiqondile kusobala ukuthi abanquma ngokupheleleyo ama-5 ku-7% ngokupheleleyo ngokuphatha kwezinkampani ngokupheleleyo ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwezinkampani ngokuphatha kwe......

Imibuzo Evame Ukubuzwa

Umbuso wokusebenza kwe-VVT engini yini?

Ukuguqula Ukugcina Kwevalve (VVT) kusinika umbono wokuguqula isikhundla sesi-camshaft, okuyisibonelo sokuguqula usuku lokuvala nokuvula kwevalve zokufaka futhi zokuphuma ngemvume yengini. Lokhu ukuguqula kubiza ukusebenza kwe-combustion, kunciphisa amasithili, futhi kubiza ukusebenza kwe-engini.

U-VVT usebenza kanjani ukunciphisa amasithili?

Izinhlangano ze-VVT zenciphisa amasithili ngokunciphisa izintemperetsha zokusebenza kwe-combustion, ukwenza ukubuyisela kwamasithili we-exhaust ngaphakathi, futhi ukuthuthukisa ukuzwela kwe-catalytic converter. Lezi zinhlangano zihambisana nokunciphisa i-nitrogen oxides (NOx) futhi amasithili we-hydrocarbon ngokuphelele.

Kungani ukugcina kahle kunezinhlangano ze-VVT kubalulekile?

Ukugcina kahle kusinika ukuthi izinhlangano ze-VVT zisebenza ngempela ngokuchaza ukupressa kwe-oil futhi ukuvimba kwe-viscosity. Lokhu kunciphisa izinkinga ezinokwenzeka njengezinkinga zesi-solenoid noma ukugcina kwe-catalytic converter, ukunika ukuthi ivihikili liyasebenza ngempela futhi amasithili ayanciphiselwa.

Izicabango ze-P0011 ne-P0420 ziyini, futhi zihambanani kanjani ne-VVT?

Ikhowudi P0011 ibonisa umbuzo wokugcina kwe-camshaft okungafanele, futhi ngamahhala kubizwa ngemiphumela yemiphumela yendawo yokuqonda kwe-VVT. Ikhowudi P0420 ibonisa ukuthi umkhakha wokugcina ayisebenzi kahle. Imiphumela yendawo yokuqonda kwe-VVT ingathinta lezi zikhowudi, futhi zibangela ukuphakama kwezinye izinto ezinconyelwe.