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Hybrid bulldozers use less fuel by providing better efficiency and fewer emissions, which was confirmed by one Caterpillar application of D7E in the market in 2010. To take advantages of the series hybrid bulldozer system, Chinese government launched similar hybrid bulldozer with independent double motor design. The Hybrid Bulldozer Power-Train system includes 14 components including motor, motor control system, engine, super capacitor to BMS and etc. This specific hybrid architecture, compared with D7E, removes the complicated hydraulic steering system. Instead, the steering function was developed by running both traction motors, further simplifying the power-train system. A Diesel engine is used to propel the attached generator to produce AC power which is then converted to DC power and connected with the main power link (super capacitor). DC power is finally converted back to AC to propel those two independent traction motors. CAN network is applied for communication.

Refuse trucks are used in many communities for garbage collection and compression in China. This article introduces representative driving cycles of refuse trucks in multiple cities. System configuration is described first. Then, traditional pedal map, shift-pattern, and shift-point are used as basis to optimize energy utilization for specific hybrid configurations under refuse truck driving situation. Since AC power is used as source for garbage compression, to take advantage of such operating characteristics, engine start and stop technology can be a viable technology to improve fuel economy. Experiments are conducted to reach the conclusions.