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 The current valid emissions standard stage IV should have been replaced by stage V by that time.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 kW 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, a SCR catalytic converter and a 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 optimised 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 560kW 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 IIIA/ IV and stage V. It allows the customer to use the same machine design for various emission standards.