Liebherr Machines Bulle SA, the Liebherr group engine manufacturer, has chosen emissions technology specialist Eminox to supply exhaust systems to achieve Stage 4 emissions standards. The systems, based on SCR (Selective Catalytic Reduction) technology, will be fitted to the complete range of Liebherr on- and off-road machines, comprising some 10,000 machines per year.

In awarding the contract, Liebherr Machines Bulle was looking for a partner who could support them with technical system development as well as the manufacture of the final units.

Eminox has supplied exhaust systems for non-road original equipment manufacturers since 1988 and has experience of integrating technologies, including DPFs (Diesel Particulate Filters) and SCR, combined with the applications engineering expertise to meet the most challenging system integration requirements.

Paul Canwell, Project Manager at Eminox, said, “This has been a real development partnership between the two companies, with each complementing the other in perfecting these systems.”

One of the key objectives was to keep the number of exhaust system variants to a minimum while working within the limited space available for mounting the systems on many of the machines. Eminox met these requirements by using novel system geometry and innovative urea injection points coupled with advanced mixing.

System development was supported by CAD (Computer Aided Design) CFD, (Computational Fluid Dynamics) simulations, acoustic modelling and back pressure calculations. Eminox’s rapid prototyping capabilities meant that prototypes could be produced at each stage of development and Liebherr could then test them on their own engine beds to confirm modelled performance.

Having designed and developed a range of systems to cover the whole range of Liebherr engines, Eminox’s flexible cellular manufacturing capability means each variant can be manufactured efficiently, in response to future demands.