Sepheo sa tsamaiso ea CVVT enjeneng

Melao ea sejoale-joale ea tikoloho e tlama baetsi ba likoloi ho etsa lienjineri tse betere, ho ntlafatsa ts'ebetso ea tsona le ho fokotsa ho ntšoa ha lintho tse kotsi likhaseng tsa mosi. Baqapi ba ithuta ho laola mekhoa e neng e amoheloa pele ka mekhoa e tloaelehileng ea khoebo. Nngwe ya ditlhabololo tse di ntseng jalo ke tsamaiso ya Variable Valve Timing (CVVT).

Moralo oa sistimi ea CVVT

CVVT (Continuous Variable Valve Timing) ke mokhoa o tsoelang pele oa ho fetola nako oa li-valve o u lumellang ho tlatsa li-cylinders ka tefiso e ncha. Sena se finyelloa ka ho fetola linako tsa ho bula le ho koala ha valve ea ho kenya.

Sistimi e kenyelletsa potoloho ea hydraulic e nang le:

• Laola valve ea solenoid;
• filthara ea li-valve;
• Mokhanni ke clutch ea hydraulic.

Likarolo tsohle tsa sistimi li kentsoe hloohong ea silindara ea enjene. Sefahla se lokela ho hloekisoa kapa ho nkeloa sebaka nako le nako.

Li-couplings tsa hydraulic tsa CVVT li ka kenngoa ka bobeli le li-shafts tsa enjene e tukang e ka hare.

Haeba li-phase shifters li kentsoe li-camshaft tse kenang le ho ntša metsi, mokhoa ona oa ho laola nako o tla bitsoa DVVT (Dual Variable Valve Timing).

Likarolo tse ling tsa sistimi li kenyelletsa li-sensor:

• Boemo le lebelo la crankshaft;
• Maemo a camshaft.

Lintho tsena li romela letšoao ho enjene ECU (control unit). Ea ho qetela e sebetsana le tlhahisoleseding ebe e romela letšoao ho valve ea solenoid, e laolang phepelo ea oli ho clutch ea CVVT.

Sesebelisoa sa clutch sa CVVT

The hydraulic clutch (phase shifter) e na le asterisk 'meleng. E tsamaisoa ke lebanta la nako kapa ketane. Camshaft e hokahane ka thata le rotor e kopanyang metsi. Likamore tsa oli li teng pakeng tsa rotor le matlo a clutch. Ka lebaka la khatello ea oli e hlahisoang ke pompo ea oli, rotor le crankcase li ka tsamaea li amana.

Clutch e na le:

• male rotor;
• stator;
• setopong pin.

Pin ea ho notlela e ea hlokahala bakeng sa ts'ebetso ea li-fathase shifters maemong a tšohanyetso. Ka mohlala, ha khatello ea oli e theoha. E thellela ho ea pele ho lumella hydraulic clutch housing le rotor ho notlela sebakeng se bohareng.

VVT e laola ts'ebetso ea valve ea solenoid

Mochine ona o sebelisetsoa ho lokisa phepelo ea oli ho lieha le ho ntšetsa pele ho buloa ha li-valve. Sesebelisoa se na le likarolo tse latelang:

• Plunger;
• sehokedi;
• Selemo;
• Matlo;
• Belofo;
• Mekhatlo ea phepelo, phepelo le ho ntša oli;
• Matsoelintsoeke.

Karolo ea taolo ea enjene e fana ka lets'oao, ka mor'a moo magnete e tsamaisa spool ka plunger. Sena se nolofalletsa oli ho phalla ka litsela tse fapaneng.

Mokhoa oa CVVT o sebetsa joang

Molao-motheo oa ts'ebetso ea sistimi ke ho fetola boemo ba li-camshaft tse amanang le pulley ea crankshaft.

Sistimi e na le likarolo tse peli tsa mosebetsi:

• ho bula li-valve esale pele;
• Ho lieha ho bula li-valve.

Tsoelo-pele

Pompo ea oli nakong ea ts'ebetso ea enjene e tukang ka hare e baka khatello e sebelisoang ho CVVT solenoid valve. ECU e sebelisa pulse width modulation (PWM) ho laola boemo ba valve ea VVT. Ha actuator e hloka ho hlophisoa ho ea pele, valve e tsamaea ebe e bula tsela ea oli ka kamoreng ea pele ea clutch ea hydraulic ea CVVT. Tabeng ena, mokelikeli o qala ho tsoa ka kamoreng ea lag. Sena se etsa hore ho khonehe ho tsamaisa rotor ka camshaft e amanang le ntlo ka lehlakoreng le fapaneng le ho potoloha ha crankshaft.

Ka mohlala, CVVT clutch angle e sa sebetse ke likhato tse 8. 'Me kaha sebaka sa ho bula li-valve tsa mochini oa enjene e tukang ka hare ke likhato tse 5, e hlile e bula 13.

Kholo

Molao-motheo o tšoana le o hlalositsoeng ka holimo, leha ho le joalo, valve ea solenoid, ka ho lieha ho fetisisa, e bula mocha oa oli o lebisang kamoreng ea ho lieha. . Ka nako ena, rotor ea CVVT e tsamaea ka lehlakoreng la ho potoloha ha crankshaft.

Maikutlo a CVVT

Sistimi ea CVVT e sebetsa ho pholletsa le lebelo la lebelo la enjene. Ho latela moetsi, mohopolo oa mosebetsi o ka fapana, empa ka karolelano o shebahala tjena:

• Idling. Mosebetsi oa tsamaiso ke ho potoloha shaft ea ho kenya e le hore li-valve tsa ho kenya li bulehe hamorao. Boemo bona bo eketsa botsitso ba enjene.
• Karolelano ea lebelo la enjine. Sistimi e theha sebaka sa mahareng sa camshaft, se fokotsang tšebeliso ea mafura le ho tsoa ha lintho tse kotsi ka likhase tse tsoang.
• Lebelo le phahameng la enjene. Sistimi e sebetsa ho hlahisa matla a mangata. Ho etsa sena, shaft ea ho kenya e potoloha ho lumella li-valve ho bula kapele. Ka hona, tsamaiso e fana ka ho tlatsoa ho molemo ha li-cylinders, tse ntlafatsang ts'ebetso ea mochine o tukang ka hare.

Mokhoa oa ho boloka tsamaiso

Kaha ho na le filthara tsamaisong, ho kgothaletswa ho e nkela sebaka nako le nako. Ena ke karolelano ea lik'hilomithara tse 30. U ka boela ua hloekisa sefe ea khale. Motho ea chesehelang koloi a ka sebetsana le mokhoa ona a le mong. Bothata bo boholo tabeng ena e tla ba ho fumana sefe ka boeona. Baqapi ba bangata ba e kenya moleng oa oli ho tloha pompong ho ea ho valve ea solenoid. Kamora hore filthara ea CVVT e qhaqholloe le ho hloekisoa hantle, e lokela ho hlahlojoa. Boemo bo ka sehloohong ke botšepehi ba marang-rang le 'mele.

E lokela ho hopoloa hore filthara e fokola haholo.

Ntle ho pelaelo, sistimi ea CVVT e ikemiselitse ho ntlafatsa ts'ebetso ea enjene ka mekhoa eohle ea ts'ebetso. Ka lebaka la boteng ba tsamaiso ea ho ntšetsa pele le ho lieha ho bula li-valve tsa ho kenya, enjene e na le chelete e ngata 'me e fokotsa tlhahiso ea lintho tse kotsi. E boetse e u lumella ho fokotsa lebelo le sa sebetseng ntle le ho senya botsitso. Ka hona, tsamaiso ena e sebelisoa ke baetsi bohle ba likoloi tse kholo ntle le mokhelo.