Locomotive and auxiliary power unit engine controller

Details Locomotive and auxiliary power unit engine controller Locomotive and auxiliary power unit engine controller

2005-08-16

2005-08-16

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

With heating means

Reexamination Certificate

active

06928972

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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