A 4.8-kilowatt motor/generator is integrated into the drivetrain between the gasoline engine and the transmission. This provides starting power and the ability to generate electricity during deceleration. It also saves weight and parts because a conventional starter and alternator are no longer needed.
At a stoplight, the gasoline engine shuts off, but the accessories continue working on stored electrical power. When the light turns green and the driver depresses the accelerator, the gasoline engine restarts automatically. The truck gets more miles per gallon because of the stop/start function, torque-smoothing for improved powertrain efficiency, and regenerative braking, which turns the motor into a generator to capture energy as the truck decelerates.
The bottom line is up to 15 percent better gas mileage with no reduction in the truck's towing capacity. This system will be available as a powertrain option on GM's full-sized pickups, the GMC Sierra and the Chevrolet Silverado, beginning in 2004.
As an added benefit of its robust electrical system, the parallel hybrid Terra4 also features a pair of 110-volt, 20-amp electrical outlets for powering anything with a standard three-prong household plug.
FOUR-WHEEL STEERING
Terra4 also features the Quadrasteer(tm) four-wheel steering system that provides car-like maneuverability in a full-size truck. The GMC-exclusive steering system guides 20-inch low rolling resistance custom Goodyear tires.