Chevrolet Tahoe Hybrid
From Chevrolet press: Chevrolet Tahoe Hybrid delivers a 33 percent improvement in city driving while retaining the capabilities of a full-size SUV, including eight-passenger seating and a towing capacity of up to 6,200 pounds (2,812 kg) on 2WD models. GM’s Electrically Variable Transmission (EVT) and 300-volt nickel-metal hydride Energy Storage System (ESS) work in concert with the standard 6.0L V-8 gasoline engine with Active Fuel Management (AFM) and late intake valve closing (LIVC) technology to enable the Tahoe Hybrid’s efficient performance. This hybrid system enables the Tahoe to launch and drive up to 30 mph on electricity alone and allows the Vortec 6.0L V-8 engine to operate in its more economical V-4 mode for longer periods.
A 300-volt nickel-metal hydride Energy Storage System (ESS) provides power to the EVT’s two electric motors. This battery pack is located under the second-row seat, where it takes up virtually no additional space. In addition to supplying power to the EVT, the ESS also provides power to the air conditioning compressor and the Accessory Power Module (APM), which converts the high-voltage supply to 42 volts for the electric power steering system, and 12 volts for the vehicle battery and other 12-volt electrical accessories.
The Tahoe Hybrid’s Vortec 6.0L V-8 produces 332 horsepower (248 kW) at 5100 rpm and 367 lb.-ft. of torque (498 Nm) at 4100 rpm, yet requires only regular unleaded fuel. At vehicle speeds between 0 and 30 mph, the gasoline engine may be automatically shut down. By leaving the engine off and allowing the vehicle to move only under electric power up to 30 mph, such as during heavy stop-and-go traffic, fuel consumption is greatly reduced.
The regenerative braking system works in concert with the hydraulic braking system. The system uses a brake pedal emulator, which provides progressive resistance as the pedal is depressed. This consistent pedal feel is very much like that of a standard hydraulic braking system in operation.