VVT bụ mkpirisi Bekee nke Variable Valve Timeing. A na-edozi ọnọdụ cam nke camshaft nke igwe omenala, a na-emekọrịta ya na oge nke engine crankshaft, ya bụ, oghere na oghere mmechi (oge) n'etiti valvụ oriri na valvụ iyuzucha adịghị agbanwe.

Ya mere, nke kacha mma Ọ na-esiri ike iji nweta ọrụ ọsọ ọsọ kachasị mma n'otu oge ahụ na oge valvụ dị ala nke ", ya bụ, ọ gaghị ekwe omume ịhazi mkpa nke nkwụsi ike ọsọ ọsọ na-abaghị uru, mmepụta ọkụ ọkụ dị ala. na mmepụta ngwa ngwa. Iji dozie ihe dị iche iche chọrọ nke engine maka oge valvụ na oke ọsọ na ọsọ ọsọ dị ala, a na-anabata usoro nhazi oge valve (VVT). A na-etinye hydraulic actuator (VVT phaser) n'ihu njedebe nke camshaft, na nrụgide hydraulic na-achịkwa electronically. Ụzọ iji gbanwee akụkụ nke camshaft n'akụkụ crankshaft iji gaa n'ihu ma ọ bụ weghachite oge valvụ ahụ. E gosipụtara VVT ​​phaser na mgbakọ camshaft na foto dị n'okpuru.

Ka ọ dị ugbu a, ọtụtụ engines mmanụ ụgbọala nwere ụdị sistemụ VVT dị iche iche. Karịsịa maka engines nwere ụkpụrụ ikuku dị elu, a na-eji usoro VVT abụọ rụọ ọrụ (ihe oriri na camshafts nwere VVT ​​phasers). N'ezie, usoro VVT na-egbo mkpa nke ọnọdụ dị iche iche na-arụ ọrụ ma nweta ihe ngosi nkà na ụzụ kwekọrọ na ya site n'ịgbanwe valvụ overlap angle. N'ozuzu, ọ nwere uru ndị a:

(1) Enwere ike ịhazi akụkụ nke oriri na iyuzucha camshafts, nke enwere ike ịbawanye site na nhazi. Oghere mkpuchi valvụ na-abawanye nnabata ikuku nke engine.

(2) Belata ọnụọgụ gas nke fọdụrụ ma melite arụmọrụ nchaji.

(3) Melite ike engine na torque, ma melite akụ na ụba mmanụ nke ọma.

(4) N'ụzọ doro anya kwalite nkwụsi ike ọsọ na-abaghị uru, si otú ahụ nweta nkasi obi na ibelata ikuku.