Exhaust gas treatment systems in agricultural tractors
2025
Daniela Herzog Zanella | José Fernando Schlosser | Alexandre Russini | Catize Brandelero
ABSTRACT: This study analyzed the distribution and configuration of exhaust gas treatment systems in agricultural tractor engines and their relationship with North American emissions legislation. The analysis was based on 523 official test reports on agricultural tractors, conducted between 2008 and 2022, and available in the Nebraska Tractor Test Laboratory (NTTL) database. For data analysis and interpretation, the tested agricultural tractors were grouped and categorized based on maximum power classes and exhaust gas treatment systems. The results indicated that the implementation of exhaust gas treatment systems of farm tractors began in 2008, with a more significant presence from 2011 onward, coinciding with the introduction of Tier 3 and Tier 4 emissions regulations in North America. The selective catalytic reduction (SCR) system is the most widely used across power classes, both independently and in combination with Diesel Oxidation Catalyst (DOC) and Diesel Particulate Filter (DPF) systems. The advancement of exhaust gas treatment technologies corresponds with increasing tractor power levels. Additionally, as emissions regulations become more stringent, standalone exhaust gas treatment systems are being replaced by integrated combinations of multiple technologies.
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