Coal Age

MAY 2018

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Page 38 of 51

May 2018 37 diesel engines continued dealers. Caterpillar will offer additional DGB systems in the future. DGB, said Cat, lowers fuel cost while maintaining diesel power and transient performance. During the same month, GFS Corp. announced the development of a new LNG fuel conversion system for the Terex Unit Rig 4400 haul truck. The company said six of those trucks will be converted at a mine in India, using its EVO-MT Sys- tem. The first six trucks are scheduled to begin operating on LNG in early 2018 and the project is slated to expand in the near future to more than 50 trucks. The EVO-MT System is an integrated system consisting of onboard fuel storage and vaporization, in addition to controls and safety systems that allow the truck to oper- ate on a combination of LNG and diesel fuel, or "NG+D," as the company refers to it. The EVO-MT 4400 system will provide 259 usable U.S. gallons of onboard liquid natural gas storage, enough to complete a 12-hour shift. Leading the Charge MTU believes the combustion engine will continue to represent a large segment of its propulsion solutions for the near fu- ture, and its stated aim to achieve a 30% improvement in CO 2 emissions by 2030. Overall, the company plans to focus on exhaust gas aftertreatment, alternative fuels, electrification, digitization and total systems capability; i.e., integration of indi- vidual components to produce complete drive and energy generation systems. As part of this plan, its parent compa- ny Rolls-Royce acquired from the German company G+L innotec the exclusive rights of use for "Cross-Charger" turbocharg- ing-by-wire technology for off-highway combustion engines in the power range above 450 kW (600 hp). Rolls Royce plans to offer MTU engines with this technolo- gy starting in 2021. MTU and G+L innotec will complete the next stages of develop- ment on a partnership basis. The electrically assisted charging sys- tem comprises an electric motor com- bined with a traditional turbocharger de- veloped and manufactured by MTU. With this setup, a turbocharger can be acceler- ated electrically and the charge pressure built up earlier. During operating con- ditions in which the energy required for increased turbocharging would normally not be sufficient, electrical assistance can provide the needed boost. To provide the turbocharger with elec- trical assistance, a permanent magnet is in- stalled upstream of the compressor wheel and the electrical winding is integrated into the casing of the compressor. With this ar- rangement, air drawn in by the compressor flows freely while cooling the special elec- trical components needed in the design. The unique feature of this arrangement is a large gap between the drive motor's magnet and winding: this so-called "media gap mo- tor" design ensures that there is no aerody- namic impact on the charger and also that existing chargers can be adapted easily to enable them to make use of this technology. MTU plans to incorporate electrically assisted turbocharging technology into future diesel engine design.

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