
Chinese automaker BYD brought out the plug-in hybrid S6DM at the North American International Auto Show this week. The automaker says the vehicle "is the world's first independent 4WD dual-mode electric SUV," a title Lexus would surely argue belongs to their RX hybrid. Nevertheless, the BYD model uses a small electric 14-horsepower (10-kW) motor connected to the front wheels, and a 102-hp (75-kW) motor sending power to the rear. The motors work with a range-extending 2.0-liter petrol engine.
A six-speed dual-clutch automatic transmission is also in use. Ultimately, drivers will be able to travel in all-electric mode for 38 miles (60 km), and 311 miles (500 km) when the combustion engine is in use. Despite the “Dual-Mode” moniker, the company says the system offers three driving modes including electric only, hybrid gasoline-electric and gasoline engine only.
Fully electric (BEV) mode:
At normal speeds, the vehicle can operate in its all-electric mode, with the electric motor (M2) propelling the rear wheels.
Hybrid gasoline-electric (HEV):
1. 2WD: The gasoline engine not only directly powers the vehicle, but also drives the electric motor (M1) at the front wheels to charge the battery pack.
2. 4WD: When more power is needed, the gas engine and the electric motor (M2) power the vehicle together. If the combined power is enough, the gasoline engine will also drive the electric motor (M1) to charge the battery pack. As speed increases, the gasoline engine can take over seamlessly with support from the 6-speed DCT; when braking, the gas engine automatically shuts down and the electric motor (M2) takes over.
3. 2WD: When battery power is low and not much driving power is required, the gasoline engine drives the electric motor (M1) to charge the battery pack and the electric motor (M2) powers the vehicle by itself.
Gasoline powered:
When driving on the highway or in case the battery pack is depleted, the gasoline engine can power the vehicle on its own very efficiently.
The BYD S6DM will likely be sold in the U.S. following an American market introduction of the all-electric BYD e6. BYD has U.S. sales of the e6 MPV scheduled for the first quarter of 2012.
Source: BYD Auto
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