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  • Ammonia Sensor for Closed-Loop SCR Control (.pdf)
    Selective Catalytic Reduction (SCR) is the dominant solution for meeting future NOx reduction regulations for heavy-duty diesel powertrains. SCR systems benefit from closed-loop control if an appropriate exhaust gas sensor were available. An ammonia sensor has recently been developed for use
  • How does SCR work
    ) then reacts with the other nitrogen compound forming elemental nitrogen and water. The two common sources of neutralizing chemical are either ammonia, which is a gas at room temperature or urea, which is normally used as a solution and must be atomized into the air. Selective Catalytic Reduction (SCR
  • Mixing It Up For SCR (Diesel Progress) (.pdf)
    As the on-highway vehicle industry begins looking ahead to the 2010 exhaust emissions standards, many engine and exhaust system manufacturers are looking at urea-injected selective catalytic reduction (SCR) as a viable option to meet Tier 4 NOx regulations. With the European market readily adopting
  • Wiremesh Substrates for Oxidation, TWC and SCR Converters (.pdf)
    and channels are used as carriers of diesel oxidation catalyst, three way catalyst and selective catalytic reduction (SCR) NOx catalyst. Wiremesh materials are chosen not only to withstand corrosion and erosion environments but also durable at maximum continuous operating temperature and peak thermal spikes
  • Monitoring, Feedback and Control of Urea SCR Dosing Systems for NOx Reduction: Utilizing an Embedded Model and Ammonia Sensing (.pdf)
    . INTRODUCTION. been suggestions that using an ammonia sensor as part. of a feedback control system may provide superior. performance [3]. An ammonia sensor has been. Selective Catalytic Reduction (SCR) of NOx with. developed [7] that provides the feedback signal needed. ammonia is the most selective
  • Dual SCR Aftertreatment for Lean NOx Reduction (.pdf)
    . Since the pioneering work of Iwamoto et al. (1) and Held. The mechanism of the HC-SCR reaction in general, and. et al. (2), extensive research has been done on. the “hydrogen effect” in particular, has also been studied. hydrocarbon selective catalytic reduction (HC-SCR) of. intensively. Many papers
  • Model Based Control of SCR Dosing and OBD Strategies with Feedback from NH3 Sensors (.pdf)
    technology [6], such a control scheme. Selective catalytic reduction (SCR) of NOx with aqueous. can be verified on an engine dynamometer using a. urea has been proven to be a viable solution for meeting. production feasible ammonia sensor. The subsequent. future diesel NOx emissions standards around
  • Simple Improvements, Significant Results - published in Power Engineering (.pdf)
    Digital control systems and advanced technologies like selective catalytic reduction (SCR) and low-NOx burners are commonly used in the power industry. Yet poor or inconsistent damper actuation remains a limiting factor in boiler control.