The PowerShift transmission makes an ideal partner for the Duratorq TDCi engine. Even efficient, lightweight turbochargers can induce a noticeable delay in torque rise on tip-in because of inertia - the so-called "turbo lag." A twin clutch transmission like the PowerShift offers an advantage because of its lower inertia compared with a typical torque converter, minimizing the effect of turbo lag. In addition, the diesel's low-end torque will allow lower launch rpm, which results in a shorter duration of clutch slip at launch for quicker acceleration.

Diesel engines tend to have differently shaped horsepower and torque curves than gasoline engines, making it desirable to adjust the step size between transmission gears accordingly. Here again, the PowerShift transmission, like all layshaft-based transmissions, offers an advantage. Internal gear sets can be changed easily during development, allowing the efficiencies of common transmission architecture, while optimizing gear ratios for both engine types.

While the shifting is automatic, the PowerShift transmission on the Bronco concept also can be placed in manual mode, with sporty Formula 1-style shifting, using a pair of control paddles on the steering wheel.

The new fully automatic Intelligentª 4WD System on the Bronco concept will be seen in production first on the 2005 Ford Escape. It replaces the current Control Trac IIª System and offers better traction and vehicle stability, improved fuel economy and smoother operation.

The automatic system requires no driver intervention and is so seamless in operation that most drivers will never notice that it has engaged - other than being impressed by the system's capability in slippery conditions.

The Intelligent 4WD System uses a fully computer-controlled clutch that engages the rear wheels only as needed. In normal conditions, the Bronco concept is driven by its front wheels. Using sensors at each wheel and at the accelerator pedal, the system's computer calculates - dozens of times per second - exactly how much torque to send to the rear wheels to minimize slip. It can even predict slip and preclude it from happening at all.

The Intelligent 4WD System eliminates one of the drawbacks of other four-wheel-drive systems tuned aggressively for maximum traction, which is a binding effect during tight turns and a feeling of driveline harshness when the system engages. The Intelligent 4WD System can sense tight turns and continuously vary torque to the rear wheels at all speeds, offering the benefits of a "locked" four-wheel-drive system without any of the drawbacks.

Vehicle Type - full-time 4WD Sport Utility...more