Locomotive and auxiliary power unit engine controller
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United States of America Patent
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Aug 16, 2005
Issued Date -
N/A
app pub date -
Aug 14, 2002
filing date -
Jan 31, 2001
priority date (Note) -
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Abstract
Systems and methods for providing auxiliary power to a large diesel engine allow shutdown of the engine in various weather conditions. An auxiliary power unit (APU) comprising a secondary engine coupled to an electrical generator is provided. An automatic control system shuts down the primary engine after a period of idling, and the APU provides electrical power for heating and air conditioning. The APU automatically starts in response to a low coolant temperature, low battery voltage, and low air reservoir pressure. It may also start automatically after extended shutdown to ensure reliability. Automatic primary engine shutdown is defeated if the secondary engine is disabled.
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