Adaptive engine preheat

Details Adaptive engine preheat Adaptive engine preheat

1994-11-25

1995-11-28

Yuen, Henry C.

Internal-combustion engines

Starting device

Control of glow plug during starting

12317921, 1231425E, F02N 1702

Patent

active

054698197

ABSTRACT:
A diesel engine preheat system includes a temperature sensor for sensing the temperature of the engine coolant, engine heaters for heating the engine, and a microprocessor for calculating the duration of a preheat cycle. When an ignition switch is turned on, the microprocessor samples the output of the temperature sensor to determine the initial engine temperature. The microprocessor computes the required heating time from the initial temperature and a stored parameter representing the relationship between increase in temperature and heating time of the engine. The microprocessor energizes a relay to connect the engine heaters to a battery for the computed time. During the preheat cycle the microprocessor decrements the computed heating time and energizes a visual display to display the time remaining in the preheat cycle.

REFERENCES:
patent: 4404932 (1983-09-01), Nakamura
patent: 4436064 (1984-03-01), Lamkewitz et al.
patent: 4552102 (1985-11-01), Egle
patent: 4939347 (1990-07-01), Masaka et al.
patent: 5050545 (1991-09-01), Shirata et al.
patent: 5063513 (1991-11-01), Shank et al.
patent: 5241929 (1993-09-01), Grassi et al.

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