Liebherr’s concept uses "SCR only" technology which requires no particulate filter. Its new basic engines will also be available in a Stage IIIA compliant versions which ensure that the interfaces on the machines are identical which reduces the number of versions needed.
The manufacturer said that important work in the drive technology area was devoted to a modular design concept comprising eleven sizes of travel drives for use on crawler cranes.
Liebherr’s LTM 1300-6.2 allterrain, launched at Bauma in Munich earlier this year, features a new crane drive concept. Instead of the two engines normally used in this size category, the model is powered by one engine only. Its fuel consumption, however, is no higher than a twin-engined crane.
Considerable development capacity continued to be devoted to converting the entire product range to the new diesel engines that comply with more stringent statutory exhaust emission limits and the exhaust gas posttreatment which these new regulations call for. Starting in 2014, diesel engines with power outputs between 130 kW and 560 kW must comply Stage IV/Tier 4f exhaust emission limits. The new generation of engines which Liebherr develops and builds in Bulle features a new exhaust emission control system that reduces emissions of soot particles and oxides of nitrogen by approximately 98%.
This is primarily achieved by selective catalytic reduction (SCR technology), but in addition the complete combustion process has been revised in order to reduce particles that form inside the engine to a minimum. A major contribution is made by commonrail fuel injection, an in-house development, together with Liebherr’s own engine management system. Since early in 2012 this injection system has been used on all Liebherr engine types complying with Stage IIIB exhaust emission limits, from the 4-cylinder inline engine to the V 12.
Further diesel engine development priorities related to the completion of seriesproduction development work and the start of production of the D834, D856, D934, D936 and D946 inline engines, and also the D9508 V engines complying with Stage IIIB/Tier 4i exhaust emission limits. The gas engines also built in Bulle are still undergoing field tests.
