What is Variable Valve Timing (VVT) and How it Works in Hindi | Types and Advantages of VVT System

In older conventional engines, the time for which the valves remained open was optimised only for single engine speed. However, as the engine speed increases, it considerably reduces the time required to fill the cylinders fully.As a result, the engine would receive less amount of charge (air-fuel mixture) which causes power-loss especially when the engine runs at high speed.
To overcome this deficiency, the engineers developed VVT or ‘Variable Valve Timing’ mechanism. The VVT varies the timing of opening and closing of valves for multiple engine speeds. At high speed, the Inlet valves open quite earlier so that more air-fuel mixture or ‘charge’ enters the cylinders. This helps to increase engine’s breathing which also improves its ‘volumetric efficiency’ to a large extent.
The Variable Valve Timing system further optimizes the timing of opening and closing the valves for multiple engine speeds. The first-generation VVT design uses two-step variation which optimises the engine for two different engine speeds. This design enables two different set of timings which includes one for the ‘part-load’ condition i.e. upto 3500 rpm and other for the ‘full-load’ condition, i.e. above 3500 rpm. In addition, VVT more often improves performance and reduces emissions. Besides, VVT also provides best of both worlds. Thus, it provides smooth idling at low rpm and maximum power at high rpm.
Furthermore, the newer generation VVT design implements 'Continuous Variable Valve Timing' or CVVT system. Besides, the CVVT varies the valve timing continuously (or infinitely) which is digitally controlled by the engine ECU. Additionally, it optimizes the valve timing for all engine speeds and conditions. Although there are different mechanisms to achieve the variation, this is mainly accomplished by using a ‘variable-timing camshaft’ and solenoid valves.
Apart from this, the CVVT uses the flexible hydraulic connection between the camshaft and its sprocket. It is operated by engine oil pressure and a solenoid-operated oil control valve which is controlled by the engine’s ECU. Furthermore, it moves the camshaft ahead and advances the timing of the opening of the Inlet valves. Some more advanced design use ‘Dual’ systems which is ‘Dual VVTi’ - one each for varying the inlet & exhaust valve timings independently.
The term VVL stands for ‘Variable Valve Lift’ while VVEL stands for ‘Variable Valve Event and Lift’. The term VVTL stands for ‘Variable Valve Timing and Lift’ which is an advanced supporting system to alter the ‘lift’ of the valves. Nowadays, the ‘VVL’ system is being increasingly used in combination with ‘Variable Valve Timing’ (VVT) systems to improve the performance.
Additionally, this design also alters the lift (or travel) of the inlet valves along with valve timing depending upon the engine’s speed. Thus, it facilitates 'low-lift' of inlet valves during idling or slow speeds and 'high-lift' at high speeds. Also, it provides precise control of the valves while opening/closing. Additionally, to conform to stricter emissions norms, manufacturers have developed many other supportive systems. These are electro-mechanical or electro-hydraulic valve-lifters and cam-less valves systems etc.
CVVT
Continuous Variable Valve Timing
VCT
Variable Cam Timing
VVT
Variable Valve Timing
DCVCP
Dual Continuous Variable Cam Phasing
VVTi
Variable Valve Timing (intelligent)
VTVT
Variable Timing and Valve Train
N-VCT
Nissan-Variable Cam Timing
S-VT
Sequential Valve Timing
MIVEC
Mitsubishi Innovative Valve timing Electronic Control
i-VTEC
Intelligent - Variable Valve Timing and Lift Electronic Control
#VariableValveTiming #VVT #CVVT
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Thanks

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Sir please explain VVA of Yamaha and other intake system.

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Variable valve timing diagram video bhi banana...

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Very informative, do we know when our vvt systems works, engine sounds different or what ? Thanks

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Actually vvt hamesha hi work karta rehta hai whether your engine is at idle position or in high speed or in lower speed. So vvt ka koi time nahi hota ki ye is time pe work karega ya is time pe nahi. So vvt technology tabhi se start ho jaati hai jaise hi aap apni car ko start karte hain

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Can you please explain about dual vvt

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Actually dual vvt and vvt mein koi bahaut zyada fark nahi hota hai. VVT mein valve timing hai vo intake open close hoti hai technology ke hisab se. And dual vvt mein bhi yahi same process hota hai vo intake and exhaust dono ke valves ki timing ko adjust karta hai. And ye aajkal new baleno 2022 mein aa rahi hai ye technology dual vvt. And dual vvt ka advantage power increase karta hai torque and emission ko aur achche se control karta hai.

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Ap batayen k old cars jo hain jaise k petrol swift and new petrol swift drive kijiye aur batayn k in mea sab se kam accelerate mea nikalne wale car kaun se hai jaise with out accelerate mea sirf move kijiye dono ko aur jab nikal rahe ho to accelerate kis car ko ziyada ki zarorat horahe hai dekhye vvt ya non vvt car mea dekhye aur mujhe bataye ga zaroor

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Kaun sa engine jyada achchha hai... vtvt,vvt,k12m

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Vvt tech used in which vehicles petrol or diesel. Heavy vehicles or light vehicles

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Maruti swift uses vvt

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Sir maruti wagon r k10 me vvt technology hai kya?

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Welcome

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Thanks sir g

[@MECHANICALTECHHINDI]

Welcome

[@omchatterjee506]

You explained that the Engine RPM data helps ECU to determine the Valve timing but you didn't explain how it controls the valves. Like in a simple SOHC or DOHC engine the cam controls the valves. How does the ECU control the Cam or the valves & also the valve lift?

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Thanks sir pr aapko animation bi dikhane chahiye usse achi tarah sae seekh skte hai (USA)

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Bike ya Scooter may v hota hay kya VVT??🌈

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Sir gi bike ke tell penal me cvti ec ingnetion systam etc kyo likha rahta hai bataiye

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Okay

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VVT technology system truck's me kyu nahi Ata hai sir please reply me thank you sir

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Please sir VVT ka diagram video banao

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Apna Tata konsa technology usekarta hain

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Sir then what is dual VVT?

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Ab toh bike mey vva aagaya hai ft.yamaha r15 v3,Yamaha mt 15

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vvt technology valve overlapping period more than normal engine speed ......reply me bro plzzz

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valve high lift kaise hoga?

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CVVT,VCT,VVT,DCVCP,VVTI,VTVT,ETC यह सब एक ही चीज होते हैं क्या

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Nahi

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Multi air engine kya hota hai

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Ye sab ek hi tarah se kam karte hai kya

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👌