Patent · US Active

System and method for adaptive aftertreatment control of NOx

US9695727B2 · kind B2 · utility

0Cited by
4References
18Claims
0Family size

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Inventors

Key dates

Filing dateSep 2, 2015
Grant dateJul 4, 2017
Priority date—
Expiry dateSep 2, 2035

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY02T10/40
  • WIPO fieldChemical engineering
  • WIPO sectorChemistry

Abstract

System and method of treating exhaust gas from an internal combustion engine using selective catalytic reduction (SCR) and adaptive control of diesel exhaust fluid (DEF) injection. Adaptive control of DEF injection includes intentionally underdosing the injected DEF based on an amount of DEF determined by an electronic control unit as an amount needed to reduce nitrogen oxides (NOx) to a compliance threshold. Since underdosing prevents ammonia (NH3) slip from occurring due to low levels of DEF, a sensor accurately senses NOx present in the exhaust gas at an output of an SCR chamber. An electronic control unit increases the amount of injected DEF based on the sensor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.