Driving up a winding mountain road can be a tiresome task. None of the gears seem to be right. Sometimes they are too high, sometimes too low. With Continuously Variable Transmission (CVT), it's a different story. As its name suggests, this automatic transmission works without any fixed shifting point. The result is a smooth drive at constant traction and engine speed.
"With its smooth and dynamic acceleration, continuously variable transmission makes driving easy and enjoyable," says Stefan Seiberth, the President of the Bosch Gasoline Systems division.
Bosch manufactures the push belts that are a central component of CVT. They make it possible for the transmission to drive engines with a torque range between 60 and 450Nm and an output of more than 300bhp. Using an electronic control, a number of different settings are possible, from economical to sporty.
In addition, the CVT is extremely compact, since it comprises just a few components. The control unit, for example, can be integrated directly into the system. The compact construction keeps the manufacturing cost down, and also means that this transmission fits into small urban vehicles. This also explains why CVT is especially popular in Japan. However, its market share is also growing in China and North America. Currently, every fifth automatic in the world is equipped with CVT. In just a few years, this share will grow to one-quarter. The technology is currently available in some 300 production models.
CVTs are equally suitable for diesel, petrol, and hybrid powertrains. And while this technology saves fuel in classic internal combustion engines, it can also increase hybrid powertrains' electric range. This is because the CVT allows the internal-combustion engine to run at a higher speed, close to the optimum operating point. As a result, part of the energy released can be used for forward propulsion, while the rest can be stored in the rechargeable battery.
"With its smooth and dynamic acceleration, continuously variable transmission makes driving easy and enjoyable," says Stefan Seiberth, the President of the Bosch Gasoline Systems division.
Bosch manufactures the push belts that are a central component of CVT. They make it possible for the transmission to drive engines with a torque range between 60 and 450Nm and an output of more than 300bhp. Using an electronic control, a number of different settings are possible, from economical to sporty.
In addition, the CVT is extremely compact, since it comprises just a few components. The control unit, for example, can be integrated directly into the system. The compact construction keeps the manufacturing cost down, and also means that this transmission fits into small urban vehicles. This also explains why CVT is especially popular in Japan. However, its market share is also growing in China and North America. Currently, every fifth automatic in the world is equipped with CVT. In just a few years, this share will grow to one-quarter. The technology is currently available in some 300 production models.
CVTs are equally suitable for diesel, petrol, and hybrid powertrains. And while this technology saves fuel in classic internal combustion engines, it can also increase hybrid powertrains' electric range. This is because the CVT allows the internal-combustion engine to run at a higher speed, close to the optimum operating point. As a result, part of the energy released can be used for forward propulsion, while the rest can be stored in the rechargeable battery.
