What does VVT mean by car engine?

Variable Valve Timing (VVT) is a technology used in automotive piston engines. VVT technology adjusts the overlap time and timing (some or all of it) in the engine's intake and exhaust systems, reducing fuel consumption and increasing efficiency.

In 1991, the University of Clemson in the United States invented a more advanced intake and exhaust valve continuously variable valve timing and obtained a patent.

American Society of Mechanical Engineers, Clemson Camshaft Boosts Auto Fuel Economy, Mechanical Engineering-CIME (1991-12-01)), after which BMW Automotive became a close partner with the university's Department of Mechanical Engineering. In 1995, Honda Motors, a leading partner of the British Rover Automobile Group, invented another continuously variable valve timing technology, VVC.

Extended information: Toyota's VVT-i system continuously adjusts valve timing, but not valve lift. It works by:

When the engine is converted from low speed to high speed, the electronic computer automatically presses the oil to the small turbine in the intake camshaft to drive the gear, so that under the action of pressure, the small turbine rotates at a certain angle relative to the gear housing, so that the camshaft rotates forward or backward in the range of 60 degrees, so as to change the moment of opening the intake valve and achieve the purpose of continuously adjusting the valve timing.

VVT, that is, engine variable valve timing technology, the principle is to adjust the amount of intake (exhaust) and the opening and closing time and angle of the valve according to the operation of the engine, so that the amount of air entering can reach the best and improve the combustion efficiency.

VVT engine, which is the abbreviation of variable valve timing, uses the VVT system of automobile engines, and has the advantages of fuel economy and large power-to-lift ratio; The disadvantage is that the torque in the middle section is insufficient.

VVT engine schematic VVT Chinese means "variable valve timing", because of the use of electronic control unit (ECU) control, so Toyota has a nice Chinese name called "intelligent variable valve timing system".

The system mainly controls the intake valve camshaft, and has a small tail "i", which is the code name for "Intellingence" (intelligence). That's the literal meaning of "vvt i". vvt—i.

The system is the English abbreviation of Toyota's intelligent variable valve timing system, and the engine of the most advanced Toyota sedan has been widely installed with the VVT-I system.

VVT is Variable Timing Valve Technology.

The number of cylinders commonly used in automobile engines is L2 cylinders. Engines with a displacement of less than 1L are commonly used with 3 cylinders; (Generally 4-cylinder engine; The engine of about 3L is generally 6 cylinders; 4L or so for 8 cylinders; The above uses a 12-cylinder engine. Generally speaking, under the same cylinder diameter, the more cylinders, the larger the displacement, and the higher the power; Under the same displacement, the more cylinders, the smaller the bore, and the speed can be increased, so as to obtain greater lifting power.

The arrangement forms of cylinders mainly include in-line, V-shaped, W-shaped, etc.

Generally, the cylinders of engines below 5 cylinders are mostly arranged in an in-line manner, and a few 6-cylinder engines also have an in-line mode, and there have been in-line 8-cylinder engines in the past. The cylinder block of the inline engine is lined up, the cylinder block, cylinder head and crankshaft structure are simple, the manufacturing cost is low, the low-speed torque characteristics are good, the fuel consumption is less, the application is more extensive, and the disadvantage is that the power is low. Generally, gasoline engines below 1L mostly use 3-cylinder in-line, (gasoline engines mostly use in-line 4-cylinder, and some four-wheel drive cars use in-line 6-cylinder, because of their small width, superchargers and other facilities can be arranged next to it.)

The dynamic balance of the inline 6-cylinder is good and the vibration is relatively small, so it is also used by some medium and high-pole cars. (6-12) cylinder engines generally adopt a V-shaped arrangement, of which the VIO engine is mainly installed in racing cars. The V-shaped engine is small in length and height, and it is very convenient to arrange, and it is generally believed that the V-shaped engine is a relatively advanced engine, and it has also become one of the symbols of the sedan class.

The V8 engine is very complex in structure and expensive to manufacture, so it is used less. The V12 engine is too large and too heavy, and only a few high-end cars use it.

At present, the most common engines are mainly in-line 4-cylinder (14) and V-6-cylinder (V6) engines. Generally speaking, the displacement of the V6 engine is higher than that of the 14, and the V6 engine is more stable and quiet than the 14 engine. The U is mainly installed in ordinary cars, while the V6 is installed in mid-to-high-end cars.

VVT is an abbreviation for VariableValvetiming, which means:

Variable timing valve dust.

System. The technology itself is not magical, but it has a certain effect of turning decay into magic. Its characteristic is that it can ensure stable combustion, reducing.

The oil cavern is not consumed. Effectively improve the emission of hydrocarbons and nitrogen-oxygen compounds, and expand at the same time.

Volume. Efficiency.

Improved combustion performance. Of course, VVT technology.

Principle. It's actually quite simple: as the engine is needed at different times.

Power. is different, VVT technology is regulated.

Valve. Opening.

Thus regulating. Air intake.

Make the engine in a different way.

Rotate speed. There is an ideal working condition: delayed intake valve opening time, which is reduced.

Valve overlap angle. At. Idle speed.

Stabilize the combustion state, reduce fuel consumption and pollution emissions under medium working conditions (driving at medium speed and constant speed), and improve engine work efficiency at high speed; By opening the intake valves earlier and increasing the valve overlap angle, it is possible to achieve a larger number of valves at low speeds and heavy loads (starting, accelerating, climbing). Torque.

Variable valve timing.

VVT (Variable Valve Timing), is a technology used in automotive piston engines. VVT technology adjusts the overlap time and timing (some or all of it) of the engine's intake and exhaust systems, reducing fuel consumption and improving efficiency.

The crankshaft is driven by timing belts, gears or chains, and the profile and position of the camshaft on the camshaft are usually optimized for specific engine speeds, which often reduces the engine's torque at low rpm and power at high rpm. VVT technology allows it to be changed according to engine conditions, which improves the efficiency and power of the engine.

VVT is an abbreviation for Variable Valve Timing, which means Variable Timing Valve System. The technology itself is not magical, but it has a certain effect of turning decay into magic. It is characterized by ensuring stable combustion, reducing fuel consumption, effectively improving hydrocarbon and nitrogen oxide emissions, and expanding volumetric efficiency and improving combustion performance.

Of course, the principle of VVT technology is actually very simple: due to the different power requirements of the engine at different times, VVT technology adjusts the air intake volume by adjusting the valve opening, so that the engine has an ideal working condition at different speeds: delay the opening time of the intake valve, reduce the valve overlap angle, stabilize the combustion state at idle, reduce fuel consumption and pollution emissions under medium working conditions (medium speed, uniform speed driving), and improve the work efficiency of the engine at high speed; If the intake valves are opened earlier and the valve overlap angle increases, more torque can be obtained during low-speed and heavy-duty operations (starting, acceleration and climbing).

2.Description: VVT engine, CVVT engine and VTEC engine are all gasoline engines with the same generation technology.

They both refer to continuously variable valve timing technology and variable intake and exhaust manifold length technology. Depending on the engine's operating conditions, the dynamic performance and fuel economy of the engine can be improved by adjusting the valve closing timing and the length of the intake and exhaust manifolds.

Pros:1. Fuel consumption is low2. Great power. Environmental protection.

Cons:1. The engine is too reliant on electronics; 2.The requirements for gasoline labeling have increased.

3.Explain that the technology adopted by the VVT engine, that is, the continuous variable valve timing technology, can continuously adjust the valve opening and closing time and air intake volume of the engine, so as to improve the engine power, optimize the torque curve, improve the product power, and reduce fuel consumption. VVT technology is the trend of automotive power development.

The above is related to the meaning of VVT engine, I hope it will help you.