Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1992-05-01
1994-01-18
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219486, 219494, 219497, 219202, 219205, 1231425R, H05B 102
Patent
active
052801586
ABSTRACT:
This invention pertains to a controller for electric heaters for preheating temperature sensitive components of internal combustion engines operating in very cold climates. The controller reduces energy consumption by turning on the engine component heater no sooner than necessary for the object to achieve the desired temperature. The device monitors ambient air temperature and when it is cold enough, projects the rate of the change of temperature forward to predict the temperature at the time the engine must next be started. Using manufacturers' heater specifications, the air temperature ambient to the engine components and an heating function derived from heat conduction theory, the device calculates the amount of time required for heating the engine components and turns on the heater when the appropriate time arrives. For vehicles going into service on fixed daily schedules, the controller automatically controls the start and duration of heating without user intervention for both daily and weekend schedules.
A key pad and display panel allow entry and verification of data for each heater, including desired use time(s) for each day of the week, vehicle/heater circuit identification, and the heating time parameter for the engine/heater.
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Matava Stephen J.
Matava Timothy
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