What is the difference between CVVT and DOHC?

DOHC, the double overhead camshaft has two overhead cams on the cylinder head, and finally it is completely sealed by the valve cover.

CVVT is the abbreviation of English Continue Variable Valve Timing, which is translated into Chinese as continuously variable valve timing mechanism. It is one of many variable valve timing technologies that have been gradually applied to modern automobiles in recent years.

2, the working principle is different

CVVT emphasizes that the valve overlap angle is controlled from time to time according to the constant change of engine working conditions, thus changing the intake air volume of the cylinder.

DOHC is the basic component of automobile engine, which consists of crank-connecting rod mechanism, valve train, cooling system, fuel system, lubrication system, electrical system and engine block. There are nearly a thousand kinds of parts, and the camshaft that controls intake and exhaust is an important part.

3. Different ingredients

CVVT system includes the following parts: oil pressure control valve, intake cam gear, crankshaft position sensor, camshaft position sensor, oil pump and engine electronic control unit (ECU).

DOHC consists of intake valve, exhaust valve, valve push rod, tappet, rocker arm and camshaft. Among them, the camshaft is the driving part of the valve train, because its cross-sectional shape is similar to peach, also known as peach shaft or eccentric shaft, which drives the valve to open and close on time.

Baidu encyclopedia -DOHC

Baidu encyclopedia -CVVT