In the article we will investigate the operation principle of the VW Multitronic gearbox, the key mechanical elements of the system.
The VW Multitronic gearbox is derivative of the continuously variable transmission (CVT) technology that strives to increase the comfort of acceleration, efficiencies in consumption and elimination of the main drawback of automatic transmissions, which is their unsophisticated gear riders. The basic concept of this drive system is utilisation of a continuously variable pair of elements, a rubberised belt and two coaxial cones with a double of grooves.
At its centre is continuously varying transmission (CVT) technology. Most automatics and manuals boast ‘x’ number of gears, from three to up to the current record of 10, in manual mode at least. But if there are no fixed gears in something like the VW Multitronic gearbox.
Adjustable pulleys: The Multitronic gearbox uses a system of adjustable pulleys chained together. One pulley is attached to the engine and one to the wheels.
Variable ratio: the dimensions of the pulleys can alter continuously to give an unlimited range of gear ratios between lowest and highest, so that the engine always runs at its best RPM, depending on speed and load.
There are a few basic elements to the VW Multitronic gearbox that make it work and, more importantly, explain what makes it such a nice-shifting gearbox. 1) Picture the front wheel drive vehicle above with a simple engine, transmission, and differential. Each of the clutches in the image serves a different purpose: To engage the engine To engage 1st gear To engage 2nd gear…
The steel chain in the Multitronic gearbox is responsible for transferring from the engine to the wheels. It differs from other transmissions that make use of gears to achieve this purpose by instead varying its length through changes with the pulleys so as to keep the same gear ratio.
Pulley arrangement in the VW Multitronic gearbox. Courtesy Prof Karthik Duraisamy/Durham UniversityThe effective gear ratio of the VW Multitronic gearbox is influenced by the pulleys in the front, which can change their diameter as the car accelerates or decelerates.
Efficiency: The pulleys constantly adjust to keep the engine running at peak RPM for maximum fuel economy and reduced emissions.
The centre of this operation is the Transmission Control Unit (TCU), which performs background calculations to determine the optimum gear ratio for any given moment by monitoring inputs such as throttle position, vehicle speed and load. Once the TCU has decided on the numerical ratio between the two axles, it instructs the pulleys and chain to change.
These are considerable benefits over traditional automatic and manual gearboxes which can make travel smoother, more powerful and more efficient. The VW Multitronic gearbox has many advantages over conventional automatics and manuals.
Because the VW Multitronic doesn’t actually involve fixed gears, it’s much smoother in operation than traditional automatics.
Because it’s not a simple gear swap (where the gear ratio must be changed every time the gear changes) but a continuous adjustment of the gear ratio, it means that it will keep the engine at its most efficient RPM all of the time, whatever speed you’re going. And that translates into improved fuel economy.
Fuel savings: Here, the text tells us that the VW Multitronic gearbox helps drivers economise on fuel costs due to the way it manages the engine to optimise fuel efficiency at any given time.
In contrast with the automatic transmissions that have a fixed number of gears (for example, 6-speed automatics, or even 8-speed ones), the gear ratios of the VW Multitronic gearbox change continuously with a wide range in between.
No fixed gears: the Multitronic is continuously variable, while all previous automatics jumped between set gears.
Gre the tailoring of gear ratios to suit the driving conditions avoids unnecessary demands upon the Multitronic system, whereas traditional automatics make the engine work harder at selective gear shifts.
The key elements of VW Multitronic gearbox are represented: steel chain continuosly variable technology, regulated pulleys and Transmission Control Unity• The VW Multitronic gearbox (CVT) is a gearbox with continuously variable technology, that’s delivered through a mechanical chain. It’s more efficient than a traditional automatic transmission, because it guarantees a continuous torque and transmits power smoothly, perfectly adapting to the speed of the car.•
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