What does the VVT of the engine mean?

When the engine speed is low, air is easy to enter the cylinder, and the load rate is low. But at this time, there is not much air, VVT can control and reduce the valve lift, reduce the amount of air entering (can reduce the amount of fuel injection), reduce fuel consumption, it is difficult for air to enter the cylinder at high speed, but VVT can control the early opening and delaying closing of the valve time, increase the amount of air intake, maintain the power output, hope to teach the master.

VVT is an abbreviation for VariableValvetiming, which refers to the 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 and reducing fuel consumption

It is Toyota's engine technology, Chinese means to change the valve structure, so as to achieve the best combustion state, such as Honda's engine intake technology called i-VTEC, BMW called vanos, Hyundai called CVVT, Mitsubishi called MIVEC, Mazda called VIS Now the engine technology basically has a device to change the valve structure, but the name is different.

The principle of variable valve timing system 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. The advantage is that it is fuel-efficient, and the power-to-rise ratio is large, while the disadvantage is that the torque in the middle section is insufficient. It's different from a normal engine.

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.

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. Its eggplant trick works by:

When the engine is converted from low speed to high speed, the electronic computer will automatically press the oil to the small turbine in the intake camshaft to drive the gear, so that under the action of pressure, the small vortex wheel 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 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 engine refers to the engine that adopts VVT variable valve timing system, which adjusts the phase of the engine cam through the control and execution system equipped with the control and execution system, so that the valve opening and closing time changes with the change of engine speed, so as to improve the charging efficiency and increase the engine power.

The working principle of VVT engine is: 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.

The VVT of the VVT engine Korean car is imitated by the Genna Hall according to Toyota's VVT-i and Honda's VTEC technology in Japan, but compared with Toyota's VVT-i variable timing valve technology, the VVT is only a variable valve technology and lacks timing technology, so the VVT engine is indeed more fuel-efficient than the general engine, but it is not as fuel-efficient as the Toyota and Honda cars of Japanese cars.

BMW has already adopted this technology in previous generations of engines, such as Honda's VTEC and i-VTEC; Toyota's VVT-i; Nissan's CVVT; Mitsubishi's Mivec; Suzuki's VVT; modern VVT; Kia's CVVT; JAC's VVT; The Great Wall's VVT and other products are also gradually being used. In general, it is actually a technology, with a different name.