Mechanical Engineering Design projects ideas

Senior Design Projects Spring 2012

Lukas Lund, Alex Kaidan, and Chris Hughes, Mechanical Engineering; and Ron Kaunisto, Civil Engineering/Mechanical Engineering


John Deere

Project Overview

John Deere is required to meet US EPA-mandated (tier 4) emission standards, aimed at reducing environmental impact of diesel engines, all by 2014. These standards specify the reduction of nitrous oxides (NOx) and particulate matter. John Deere is investigating the use of Selective Catalytic Reduction (SCR) systems to reduce NOx from the exhaust of diesel engines. This process uses a urea solution, called diesel exhaust fluid (DEF), which is injected into the exhaust and then converted into ammonia to chemically transform the NOx into nitrogen and water molecules. DEF freezes at -11C; therefore, vehicles operating below this temperature will require the DEF to be thawed. EPA regulations require injection to start within seventy minutes of startup at -18C. By this time, there must be adequate DEF available to maintain injection. The components needed for operation include a fluid heater, a temperature sensor, a level sensor, a suction line, and a return line within a five-gallon tank.

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