Porsche introduced the first truly novel valve technology, more than a century after Carl Benz unveiled the first internal combustion engine in 1886. Porsche’s VarioCam variable valve timing system was used in automobiles. Continuous Variable Valve Timing (CVVT) is a valve-time technology that regulates the timing of a valve lift event and is frequently used to increase efficiency, reduce emissions, or both.
The combustion chamber’s leftover exhaust gas can be controlled by CVVT technology. The technology allows for maximum exhaust gas ejection from the combustion chamber when operating at high speeds by opening the intake valve in the middle and at the end of the compression stroke (there is a moment where the intake and exhaust valves are both open, known as valve overlap). When working at high speeds, this provides a significant power boost.
The intake valve can be closed after operation to operate at reduced rates. The volume of the air-fuel mixture increases as the intake valve closes early during the intake stroke, increasing engine output. On the other hand, if the intake valve closes late during the intake stroke, the volume of the mixture in the chamber is reduced, and the engine power is reduced if the fuel injection is reduced to compensate for the reduced volume.
This can increase fuel efficiency in low-load operating conditions by lowering pumping loss (the force required to compress the air inside the piston) and fuel injection volume.
The power necessary to carry out intake and exhaust pumping operations is known as pumping loss. Consider a syringe. Pressing the plunger in while obstructing the injection tip encounters greater resistance than obstructing the tip mid-plunge. Almost all automotive engines come with CVVT as standard equipment.
In 2001, BMW introduced Valvetronic, the second advancement in variable valve technology. The continuously variable valve lift system, or CVVL, used by BMW allows it to adjust how high a valve opens.
Only a small number of automakers with rights to the CVVL network, including Hyundai Motor Group, BMW, and Toyota, can use the technology. In 2012, the Hyundai Motor Group independently created a 2.0L gasoline CVVL engine, which made its debut with the enhanced model of the 7th generation Sonata.
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The Hyundai Motor Group has previously offered the VVT-i, i-VTEC, CVVT, and CVVD [w/VIDEO].
The valvetrain systems used in modern automobiles include VVT (Variable Valve Timing), VTEC (Variable Valve Timing & Lift Electronic Control), VVT-i (Variable Valve Timing with Intelligence), i-VTEC (intelligent VTEC), Dual VVT-i, and CVVT (Continuously Variable Valve Timing). A new one has now been added by the Hyundai Motor Group (HMG): CVVD, or Continuously Variable Valve Duration.
The groundbreaking innovation, which was initially suggested at the HMG International Powertrain Conference in October 2017, was unveiled this morning at the Hyundai Motorstudio Goyang in Korea. Future Hyundai and Kia vehicles will feature the Smartstream G1.6 T-GDi engine, which will be the first engine to use the technology.
In addition to being environmentally beneficial, CVVD optimizes fuel usage and engine performance. Valve control technology claims to increase performance by 4%, increase fuel efficiency by 5%, and reduce hazardous emissions by 12% by controlling the length of valve opening and shutting in response to driving conditions.
Typical variable valve control technologies regulate the valve’s timing of opening and shutting (as in CVVT) or regulate the amount of air allowed by varying the depth of the opening. Because the valve’s closing timing was dependent on its opening timing and was unable to adapt to different driving scenarios, earlier variable valve control technologies could not alter valve duration. By altering the duration of a valve’s open state, CVVD advances technology in a new direction.
The intake valve is opened by CVVD from the middle to the end of the compression stroke when the vehicle is moving at a constant speed and only needs a small amount of engine power. Through a reduction in compression resistance, this enhances fuel efficiency. In contrast, when the engine is operating at a high output, such as when the vehicle is moving at a high speed, the intake valve is closed at the start of the compression stroke to maximize the amount of air used for combustion, increasing torque and facilitating faster acceleration.
The new Smartstream G1.6 T-GDi Engine, a V4 turbocharged petrol powerplant with 180 bhp/265 Nm output, was unveiled alongside the new CVVD technology. It utilizes Low-Pressure Exhaust Gas Recirculation (LP EGR) in addition to the Group’s new CVVD technology to further maximize fuel efficiency.
The new unit also includes a powerful direct spray system that achieves 350 bar, exceeding the 250 bar of the old T-GDi engine, and an Integrated Thermal Management System that swiftly heats or cools the engine to an ideal temperature. Additionally, the use of low friction moving parts reduces engine friction by 34%.
According to Albert Biermann, president and head of the research and development division at Hyundai Motor Group, “the development of the CVVD technology is a good illustration of how HMG is enhancing our powertrain technology.” To bring about paradigm shifts and maintain the longevity of our business model, we will keep up our innovation activities.
Exhaust emission control system and continuous variable valve timing (CVVT) system information for the Hyundai Kona
Hyundai Location: Continuously Variable Valve Timing (CVVT) System and Exhaust Emission Control System
Hyundai Azera 2011–2022 Service Manual, Fifth Generation HG (2011–2022), Engine Mechanical System, Cylinder Head Assembly, CVVT Assembly Description and Operation
the engine oil temperature is measured by the CVVT Oil Temperature Sensor (OTS).
and the Cam Phaser, which alters the cam phase using the engine oil’s hydraulic force.
Press the rear window defroster button to turn on the defroster for the rear windows.
The actuator is driven by the BCM after it reads the input/output value from the GDS.
How is the CVVT put to use?
At higher rpm, the CVVT engine system extends the intake valve timing adjustment. The longer delayed exhaust and advanced intake valve allow for more air to reach the engine at higher rpms. The combustion chamber is entirely filled with the ideal air-fuel mixture, and the oil efficiency increases.
How similar are CVT and VVT?
Continuous variable transmission, or CVT. This allows for an endless number of gear ratios. Variable valve timing (VVT). It is utilized for engines where changing the lift timing for an engine’s intake/exhaust valves at high engine speeds is necessary.
What distinguishes CVVT and VVT from one another?
The acronym for English Continue Variable Valve Timing is CVVT. The phrase “continuous variable valve timing mechanism” translates to Chinese. It is one of the numerous variable valve timing technologies that have been progressively included into contemporary automobiles in recent years. For instance, BMW uses the name Vanos, Toyota uses VVT-i, and Honda uses VTEC. Regardless of the name, the goal is the same—to match the ideal valve overlap angle (valve timing) for various engine operating conditions—but the approach is different.
Unilaterally variable valve control is known as single VVT-i. There is a difficulty in the field when the engine is running. Only one person may operate the rotary area. Dislocation may be a phenomena in the rotational area. To balance the suction and exhaust in order to turn the engine is thus a crucial issue at the moment. In any situation, the equilibrium between the suction and exhaust can be reached.
Control of the intake and exhaust systems is referred to as double VVT-i. The control of the exhaust VVT-i will delay the exhaust time while the control of the intake VVT-i will advance the intake time and boost valve lift. Similar to a smaller turbocharger, this effect can significantly increase engine output. Additionally, the aim of low emission is accomplished due to the more complete burning of gasoline as a result of the increase in intake volume.
A transmission or CVVT?
An automated transmission that can vary smoothly across a continuous range of gear ratios is known as a continuously variable transmission (CVT). This is in contrast to other transmissions, which only offer a fixed number of gear ratios.
Is CVT superior to VVT?
The technology known as variable valve timing (VVT) is used in gasoline and diesel engines to regulate the timing of the valves. Along with other advantages like improved power and torque and lower emissions, this enables the engine to operate more efficiently.
Continuously Variable Gearbox, or CVT for short, is a kind of automatic transmission that modifies the gear ratio using a pulley system. As a result, the CVT can deliver efficient gear changes and higher fuel economy.
Well, depending on what you are looking for in an engine, both engines offer their own advantages.
VVT is a better choice if you’re seeking for a petrol engine with more power and torque. Diesel engines benefit more from CVT since it offers efficient and smooth gear changes, which are crucial for a diesel engine.
Describe a CVVT cover.
A seal on the cover (A) and a seal that is recessed in the E-CVVT are both used by the CVVT system to prevent the ingress of oil and/or dust. If oil is discovered inside the cover, the cover’s oil seal should be broken.
Which automobile has the finest CVT?
Having said that, not all CVTs are made equal; some are superior to others. These vehicles all feature CVTs.
Honda (Jazz, City, CR-V, Civic, HR-V, Odyssey), Subaru (Forester, WRX), and Toyota make some of the greatest CVT-type automatics we’ve tested so far.
Due in significant part to the use of a torque converter to transfer power to the driving wheels, the CVT-type automatic transmission that is installed in these cars offers quiet operation and smooth acceleration.
However, the CVT installed in the Subaru WRX is the one that has so far shocked us the most. You wouldn’t be aware that the car has a CVT transmission if we hadn’t told you.
Contrary to other CVTs we’ve experienced, the Subaru WRX launches itself with great vigor when asked for more, and the CVT matches the shifting characteristics of conventional automatics, increasing the whole experience.
Then there is Proton, which continues to insist on equipping its vehicles with CVTs that have a start-up clutch.
Punch-sourced CVT-style automatic transmissions are installed in Proton vehicles such the Exora, Iriz, and Persona.
Although it may appear positive on paper, Proton cars with CVTs are jerky in traffic, loud, and unrefined—all things that a CVT is not supposed to be.
At least Hyundai-sourced 4-speed torque converter automatic has been installed in place of the Saga’s CVT by Proton.
To be honest, Mitsubishi’s application of CVT in models like the Outlander and ASX may best be regarded as average, as it is frequently hesitant when the pedal is pressed all the way to the floor and is far from being as responsive as its competitors. At motorway speeds, the noise level is likewise fairly loud.
began in the IT sector but managed to make his way into the automobile sector. When he’s not playing video games, he’s working on his daily or weekend car.