At bauma 2016, Liebherr will present a solution to comply with the future Stage V EU emissions standard for diesel engines. The SCRFilter has already been certified for Stage IV diesel engines and the Swiss market. The SCRFilter complies with the regulations planned for Stage V diesel engines and is now being used in machines for tunnel construction. The SCRFilter system is part of the modular Liebherr engine concept, extremely compact and is characterized by long service intervals of over 4,500 hours.
Exhaust-gas-aftertreatment system for stage V already in use today
To protect humans and the environment, the regulations for exhaust gases from mobile machinery will be further tightened in the European Union starting from 2019. The current valid emissions standard Stage IV will be replaced by Stage V by that time. The planned regulations aim at further reduction of the emitted particles for diesel engines with an output range between 130 and 560 kW and limit the values for the emitted particulate matter. Furthermore, from 2019 engines with a performance range over 560 kW will also be regulated. Very similar strict emissions regulations already apply to tunnelling applications in the EU and for off-road machines in Switzerland. Therefore, Liebherr fitted the first machines with the SCRFilter system in 2014. Since mid-2015 the system is being installed in end devices as standard. An exhaust-gas aftertreatment system, which has already been tried and tested in the field, is thus, available to customers.
Compact system combines SCR catalytic converter and particulate filter
The SCRFilter system from Liebherr comprises a DOC catalytic converter, an SCR catalytic converter and an SCR-coated particulate filter. The DOC catalytic converter is maintenance-free and the coated particulate filter has passive regeneration, making the system reliable and easy to operate. The combustion process was optimized so that only a few particles arise that have to be held back by the SCRFilter. As a result, the maintenance intervals can be stretched to more than 4,500 operating hours. With the in-house development of engines, injection systems, engine controls and exhaust-gas aftertreatment solutions Liebherr enables high system integration. High efficiency stage can be achieved with simultaneous low fuel consumption. As an all-in-one solution, the further developed ECU3 engine control unit comprises all control functions for engines up to 560 kW and also for exhaust-gas aftertreatment.
Modular engine concept for every emission standard
The SCRFilter is part of the Liebherr modular system for engines and is, therefore, compatible with all engines in the D93, D94 and D95 Series. These engines have identical performances, machine cooling system requirements and the same interfaces during installation for the emission standards Stage IIIA/IV and Stage V. It allows the customer to use the same machine design for various emission standards.