SAE 2014 Heavy-Duty Diesel Emissions Control Symposium

Technical Session Schedule

Thursday, September 18

Non-Road Strategies and Future Developments
(Session Code: HDD600)

Room Bankett High  

Time Paper No. Title
The Next Liebherr Aftertreatment Solution: Towards Stage V?
The current Stage IV/Tier4f limits for engine emissions of construction machines is enforcing an even more stringent use of after treatment system as seen already during Stage IIIB/Tier4i emission limits introduction. Our Liebherr Machines Bulle proposal is a simple and cost effective approach with no EGR and SCR only (no DOC, no DPF). In addition to this standard Stage4/tier4f solution, this paper will then presented in details our technical solutions and results of a combined SCR on Filter systems currently in development for specific markets needs and preparing any further legislations steps.
Regis Vonarb, Liebherr Machines Bulle SA
Off-Road Mobile Machinery Fuel Efficiency – A Total Systems Perspective
Increasing the work per unit of fuel burned of mobile non-road equipment has positive economic and environmental implications through reduced owning and operating costs and lower greenhouse gas emissions. To realize and drive these benefits the enormous diversity in the types and applications of non-road machines and the functions they perform must be considered. The optimization of fuel efficiency, productivity and cost while meeting emissions requirements for off-road equipment can be best achieved by taking a total systems perspective, considering applications, and appropriately tailoring technologies. This presentation will illustrate the benefits of systems optimization using a detailed example of a hybrid hydraulic excavator and examining the benefit of technologies at the component, engine, machine system, and worksite levels.
M. Lou Balmer-Millar, Caterpillar
High Efficient SCR Control for Tier4f / Stage 4
The AGCO Power Inc. located in Finland is as one of the most important suppliers for heavy duty diesel engines mainly used for agricultural and industrial applications. To overcome the challenges for Tier4f / Stage 4 emission regulations for their new engines a high sophisticated SCR control strategy was developed in a close cooperation with the engineering partner AVL.

To handle the wide range of applications (Tractors, Combines, Forest machines, ..) for the different customers (Challenger, Fendt, Massey Ferguson, Valtra, ..) for 8 main engine types (from 3 up to 12 cylinder engines) using two technology routes (EGR + SCR and SCR only) with a minimum calibration effort, a model based approach was used within the whole development phase. Different SCR technologies were analyzed and their behavior transferred into physical models in the AVL MoBEO development environment.

The same model parameters are also used for the real-time models in the ECU (Engine Control Unit), which are one of the core elements for the model based dosing control. Due to this model based approach the additional calibration work for the different EAS configurations is mainly handled by a change in the geometric parameters, as the catalyst properties remain the same.

To overcome production tolerances and aging effects for all relevant components of the SCR system smart adaptation functions were developed by AVL in close cooperation with AGCO Power. These algorithms are only based on the NOx sensors (upstream DOC and tailpipe) and the high sophisticated models of the EAS components, avoiding the deployment of an NH3 sensor.

The main task of these functions is optimized AdBlue dosing with the boundary of not crossing the legislative limits for NOx and NH3 tailpipe emissions and to achieve minimized AdBlue consumption.
Heimo Schreier, AVL LIST GmbH