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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
  • Ammonia Pressure Measurement using Thermal Flash Protection (.pdf)
    Situation: Ammonia offers refrigeration pump and compressor manufacturers an improved efficiency over Freon based systems. However, the thermodynamic behavior of ammonia is very different from Freon. When the refrigeration pump turns on, the ammonia temperature rapidly changes from 100°F to -70°F
  • Model Based Control of SCR Dosing and OBD Strategies with Feedback from NH3 Sensors (.pdf)
    This paper presents a model-based control system for SCR urea dosing employing an embedded real-time SCR chemistry model and a NH3 sensor. The control algorithm consists of a number of control features designed to enhance ammonia storage control and closed-loop compensation using the mid-brick NH3
  • Dilution Flow Panels for Combustible Gas Monitoring
    the presence of oxygen. Catalytic combustible sensors detect the presence of many. combustible gases, including natural gas (methane), solvent vapors, hydrogen, ammonia, and even carbon monoxide. Due. to its simplicity, rugged design, and versatility, catalytic combustible sensors are employed in many

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