The auto trans is
using hydraulic clutches to keep the engine in the highest torque / power band and changes rapidly between the gears - why there are now 5,6 or 7 speeds available also cvt (constant variable transmission).
Not exact matches
Basic automatic transmission function is it
uses hydraulic pressure, valves, switches and
clutches to shift up and down.
The secret, aside from the new transmission, is a new engine decoupler that is actuated
using an electric
clutch rather than an electro -
hydraulic mechanism, as in the last generation.
While manual transmissions make
use of the
clutch to change gears, automatic transmissions rely on a complicated
hydraulic system for shifting, and the transmission solenoid is especially important for this process.
The Citroën DS, introduced in 1955,
used a
hydraulic system to select gears and operate the conventional
clutch using hydraulic servos.
Usually this ability is provided with a differential known as a viscous coupling or multi-plate
clutch, although more recently a similar outcome has been achieved by
using electronically - controlled
hydraulic or electro - magnetic «
clutch» systems.
Porsche's Traction Management system
uses an electro -
hydraulic, multiplate
clutch to engage the front axle depending on need.
The multi-plate
clutch controlled four - wheel - drive system of the old 911 Turbo S has also been reworked with electro -
hydraulic actuation replacing the exclusively
hydraulic operation
used up until now.
The wet multi-plate
clutch system
uses hydraulic pressure to actuate the
clutches and provide for gear selection.
The multi-plate
clutch at the heart of the Golf R's Haldex 5 all - wheel drive system is familiar enough,
using an electro -
hydraulic oil pump to engage and send almost 100 percent of available torque to the rear axle when a control unit deems it necessary.
Called the Nano F - Tronic, an electro -
hydraulic mechanism that
uses electronic control unit and a
hydraulic system to supervise
clutch usage and gear shifting, allows the driver to shift gears without a
clutch.
* 2: ACD (Active Center Differential) The Active Center Differential
uses an electronically - controlled
hydraulic multi-plate
clutch to optimize front / rear wheel torque split and thereby produce the best balance between traction and steering response.
Getrag
uses a newly developed electro -
hydraulic on - demand
clutch actuation to ensure fast and robust controllability of the wet
clutch while lowering the needed actuation energy to a minimum.
Toyota adopts concentric slave cylinder (CSC);
using a
hydraulic cylinder to directly operate the
clutch cover improves system rigidity, thereby optimizing
clutch operation and reducing weight
It
uses a WRC gearbox with an automatic
clutch, modified with
hydraulics for paddle - shift operation.
The Twin Motor 4WD system does away with the propeller shaft,
hydraulic system and
clutch plate
used to connect the front and rear axles in conventional 4WD systems.
An Automated Manual Transmission is basically a gearbox which is nothing but a regular manual transmission with an electronic control unit and a
hydraulic system which supervise the
use of
clutch and gear shifting.
Manual - transmission models
used an AWD viscous - coupling locking centre differential that split power 50/50 front and rear, while automatics got a planetary centre diff and a variable
hydraulic transfer
clutch.
Using an electronically controlled
hydraulic clutch, the AWD system distributes drive between the front and rear wheels to ensure the best possible road grip in all situations.
This new transmission also
uses a quick - response, low - friction
clutch pack for enhanced fuel economy; an ultra-flat, low - inertia torque converter for high transmission efficiency; a set of high - response, low - slip
clutch packs and new electronic and
hydraulic control systems that incorporate an intelligent shift control that learns driver's driving style and selects gears based on that style.