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November 1, 2009, Hengtong Bus announced China first gas-electric hybrid bus with fully independent intellectual property right off the assembly line and is expected to put into run in main city of Chongqing at the end of this year.
Tianye, Chief engineer on new energy projects of Hengtong bus introduced, they launched the gas-electric, gasoline-electric hybrid buses both are domestic initiative. Bus does not require extra electrification, its working principle is: In the downhill, when braking the inertia of the vehicle itself produces DC, charge for the lithium-ion battery. At the start, using power-drive, under normal driving, use gas or diesel.
Tianye introduced, gas-electric hybrid bus is 12 meters long, with 33 seats, can accommodate a maximum of about 90 people, completely adopt self-developed technology. Inspected by the State Bus Quality Inspection Center, energy saving more than 22%; reduce emissions more than 500 kilograms per year, saving nearly ten thousand cubic meters of gas. "From the appearance, the hybrid buses and ordinary buses have not significant difference," Tianye said, but when starting, the vehicle is unusual quiet, during moving process, the vehicle body is very stable and minimal vibration.