Access Type

Open Access Thesis

Date of Award

January 2013

Degree Type

Thesis

Degree Name

M.S.

Department

Mechanical Engineering

First Advisor

Dinu Taraza

Abstract

This study involves the cold start testing of ULSD and JP8 fuels on the 6 cylinder 7.2 liter turbocharged diesel engine at various ambient temperatures as low as 0oF for JP8 fuel and 10oF for ULSD fuel. Cycle by cycle analysis of the cold start transient data, along with the effects of variation in ambient temperature on the engine cranking speed and in cylinder motoring pressure were analyzed and presented. It was found that the reduction in ambient temperature resulted in prolonged cranking periods along with the longer time taken to reach idling speed as well as increased combustion instability. This phenomenon was observed for both ULSD and JP8 fuels at low ambient temperatures.

The engine ECU fueling strategy was studied at ambient temperatures as low as 0oF and found to be inadequate to result in prompt engine start. Several challenges with the engine controller such as fuel injection cut off, out of phase injection signal between the ECU and the fuel line pressure buildup were also identified

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