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LiuGong wins engine patent

First publishedin Aggregates Business International
March April 2016
Chinese construction equipment manufacturer LiuGong has been granted a patent by the State Intellectual Property Office for the development of an engine power control method to improve the load capacity of engines.

It is the first engine-related patent won by LiuGong in the field of engine manufacturing, as well as a landmark technological achievement resulting from its cooperation with Cummins.

“For an engine incorporated with the patented technology, once beyond the rated value, the engine power increases as the rotating speed decreases. But after the power reaches its peak, it begins to decrease as the rotating speed falls,” says the company.

“Thus, the relation between the engine power and rotating speed forms a humped curve, which becomes the most representative feature of the patent. Engines with such power performance can automatically deliver larger torque in the case of a large obstruction to improve the working efficiency of wheeled loaders.

“When designing the humped power curve, the team referred to the load spectra of loaders under different working conditions to match the fuel-efficient range of engines with the high-efficiency range of torque converters, so that the fuel consumption of the machine is the lowest when engines are operating at the maximum power. In contrast, traditional engines cannot fully satisfy the working requirements of wheeled loaders since actual working conditions are not taken into consideration during their design.”

The patented technology has already been successfully applied to LiuGong’s H series wheeled loaders, and the engines with the patented technology are also available to all wheeled loader manufacturers in China.

Although the technology is specially designed for wheeled loaders, it paves the way for technological R&D and innovation of other construction machinery products.

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