Specifics of Daimler's new SCR system (BLUETEC) in the Diesel Sprinter Van - Certified for NAFTA 2010
Bibliographic record
Abstract
Beginning in 2010, Daimler's well-known Diesel Sprinter van has to fulfill the new and clearly tighter NOx emission standards of NAFTA10 (EPA, CARB). This requires an integrated approach of further engine optimizations and the implementation of an innovative exhaust aftertreatment technology. The goal was to develop an overall concept which meets simultaneously the tightened emission standards (including OBD limits) and the increasing customer demands of more power and torque without losing the high fuel efficiency of the small and highly efficient 3-liter V6 diesel engine OM642, which already has been installed in the NAFTA07 Sprinter. In the early stages of the concept phase, the most appropriate NOx aftertreatment technology and certification form (engine or vehicle) had to be selected for this specific vehicle class in the van segment with enhanced requirements to durability, economical efficiency and specific driving behavior. The implementation of Daimler's BLUETEC SCR system combined with a vehicle certification reveals the best way to meet the multilayer requirements. Due to the usage of a small passenger car derived but highly efficient diesel engine (OM642), the adoption of passenger car derived SCR components (AdBlue® dosing valve, tank and dosing system) was more appropriate as our heavy duty derived components. The following SAE paper illustrates the implementation of the SCR system (BLUETEC) into the Diesel Sprinter van in detail. Main investigation areas are the adaption and optimization of the exhaust gas system including catalyst coating and the AdBlue\sr dosing system, specifics of the operation strategy and the overall balancing of engine and exhaust system optimization to meet the van specific requirements and the customer demands for more power, torque and fuel efficiency. The result is an attractive and unique powertrain concept for vans in North America. The new NAFTA10 Diesel Sprinter offers now higher power (188 hp) and torque (325 ft-lb) at even improved fuel efficiency (24.7 mpg) and significant lower NOx emissions (up to 90%) compared to its predecessor. Consequently, Daimler developed a clean, environmental-friendly and economical highly efficient sustainable solution for future transportation in the van segment of North America. Beginning in 2010, Daimler is going to sell the NAFTA10 Sprinter generation additionally as Mercedes-Benz vehicle in USA (all 50 states) and Canada, besides the well known branding as Freightliner.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.033 | 0.015 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".