I-VVT isifinyezo sesiNgisi se-Valve Valve Timing. Isikhundla sekhamera ye-camshaft yenjini yendabuko silungisiwe, ivumelaniswa nesigaba se-crankshaft yenjini, okungukuthi, i-angle yokuvula nokuvala (isikhathi) phakathi kwe-valve yokudonsa kanye ne-valve yokukhipha ayishintshi.

Ngakho-ke, okungcono kakhulu Kunzima ukufeza ukusebenza okuhle kakhulu kwejubane eliphezulu ngesikhathi esifanayo ne-valve yesivinini esiphansi sesikhathi ", okungukuthi, akunakwenzeka ukulinganisa izidingo zokuzinza kwejubane elingenzi lutho, ukuphuma kwe-torque enesivinini esiphansi. kanye nokukhishwa kwesivinini esikhulu. Ukuze kuxazululwe izidingo ezihlukene zenjini zokubeka isikhathi se-valve ebangeni lesivinini esikhulu kanye nesivinini esiphansi, kwamukelwa uhlelo lwe-valve timing (VVT) oluguquguqukayo. I-hydraulic actuator (VVT phaser) ifakwe ekugcineni kwe-camshaft, futhi ingcindezi ye-hydraulic ilawulwa nge-elekthronikhi. Izindlela zokushintsha isigaba se-camshaft ngokuhlobene ne-crankshaft ukuze uthuthuke noma uhlehlise isikhathi se-valve. Umhlangano we-VVT ​​phaser kanye ne-camshaft uboniswa esithombeni esingezansi.

Njengamanje, izinjini eziningi zikaphethiloli zifakelwe izinhlobo ezahlukene zezinhlelo ze-VVT. Ikakhulukazi ezinjinini ezinamazinga aphezulu e-emissions, zifakwe izindlela ezimbili ze-VVT (ama-camshafts okungenisa nawokuqeda afakwe ama-VVT phasers). Eqinisweni, uhlelo lwe-VVT ​​luhlangabezana nezidingo zezimo ezihlukene zokusebenza futhi lufinyelela izinkomba zobuchwepheshe ezihambisanayo ngokushintsha i-valve overlap angle. Ngokuvamile, inezinzuzo ezilandelayo:

(1) Isigaba sama-camshafts wokungenisa kanye nokukhipha singalungiswa, esingandiswa ngomthethonqubo. I-valve overlap angle inyusa ukungena komoya kwenjini.

(2) Yehlisa i-coefficient yegesi ekhishwayo esele futhi uthuthukise ukusebenza kahle kokushaja.

(3) Thuthukisa amandla enjini kanye netorque, futhi uthuthukise ngempumelelo ukonga kukaphethiloli.

(4) Ngokusobala ithuthukisa ukuzinza kwesivinini sokungenzi lutho, ngaleyo ndlela ithole ukunethezeka nokunciphisa ukukhishwa kwekhabhoni.