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Fiat: dual clutch upgrades (error fixed)

by David Zatz on

Fiat’s Brazilian web site announced two improvements to the Fiat automated automatic transmissions (DDCT), which may have been developed from the work of Chrysler and Fiat engineers making the Dodge Dart DDCT more palatable to American customers. The main changes are in “creeping” and aborting upshifts.

“Creeping” is the tendency for cars with automatic transmissions to crawl forward at low speeds (on level roads) when the car is in Drive and the driver’s foot is off the brake. To emulate this, soon after the driver releases the brake, the computer will now couple the gear progressively, allowing the car  to move on its own, up to 4.5 mph. This makes parking and stop-and-go traffic easier. The maximum torque is of 25 pound-feet, allowing the car to “creep” on slightly inclined roads.

The other primary change is called “Auto-Up Shift Abort.” The system is, in Fiat’s words, “able to identify the exact moment the speed needs to be resumed and abort, as the case may be, the shift to a higher gear, maintaining a high engine speed to make more torque and power available.”

The Dualogic Plus transmission sold in Brazil is a single clutch automated-manual transmission. Dualogic gets its name from having dual modes, automatic and manual, rather than dual clutches — which are not currently available in Brazil. The Dualogic improvements do, though, mirror those that “domesticated” the Fiat dual-clutch (DDCT).

(Thanks, Patrick McNamara)


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