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US 6,445,997 B1Granted
Controller and storage medium for detecting cold engine operation
AssigneeDetroit Diesel Corporation
InventorEric D. Thomas
Life of this patent
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AssigneeDetroit Diesel Corporation
InventorEric D. Thomas
Estimating the term…
An engine controller and computer readable storage medium for detecting cold engine operation include determining at least two fluid temperatures and providing an output signal based on the at least two temperatures. Preferably, an engine coolant temperature, an intercooler temperature, and an engine air temperature are determined via appropriate temperature sensors. In one embodiment, the cold engine output signal is activated or asserted if any one of the at least two fluid temperatures is below a corresponding temperature threshold. The cold engine output signal is deactivated when all of the fluid temperatures are above corresponding temperature thresholds (plus hysteresis where applicable). An optional user-selectable parameter provides for actuation of the cold engine output only during idle. The cold engine output signal may be used to control various accessories including coolant heating systems, shutters, or the like. Additional parasitic loads or an exhaust brake may be actuated to increase combustion temperatures by increasing engine load to reduce or eliminate white smoke.
An engine controller including a computer readable storage medium having stored data representing instructions for detecting cold engine operation of an internal combustion engine including a plurality of sensors for detecting a corresponding plurality of fluid temperatures in communication with an engine control module having stored temperature thresholds associated with the fluid temperatures, the engine controller determining a plurality of fluid temperatures using at least one of the plurality of sensors, comparing each of the plurality of fluid temperatures to a corresponding fluid temperature threshold, and generating a cold engine output signal until every one of the plurality of fluid temperatures is above its corresponding fluid temperature threshold.
A system for detecting cold engine operation and providing a cold engine output signal for use in engine or vehicle control, the system comprising:
A computer readable storage medium having stored data representing instructions for detecting cold engine operation of an internal combustion engine including a plurality of sensors for detecting a corresponding plurality of fluid temperatures in communication with an engine control module having stored temperature thresholds associated with the fluid temperatures, the computer readable storage medium comprising:
Dependencies are inferred from the claim text.