Cooling fan control for improved engine load acceptance

Details Cooling fan control for improved engine load acceptance Cooling fan control for improved engine load acceptance

2006-11-14

2006-11-14

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Cooling

Automatic coolant flow control

C123S041490

Reexamination Certificate

active

07134406

ABSTRACT:
The present invention provides a means for momentarily reducing cooling fan load on an engine when a machine encounters sudden loads. The system includes an engine, a load driven by the engine, a cooling system associated with the machine, and one or more controllable cooling fans for delivering air to the cooling system. A controller continually monitors engine speed, reducing fan load when engine speed is both decreasing faster than a maximum rate and is lower than the desired speed. The controller then re-engages the fan load when engine speed is approximately equal to the desired speed or when a maximum disengagement time has elapsed.

REFERENCES:
patent: 4522553 (1985-06-01), Nelson et al.
patent: 6199006 (2001-03-01), Weiss et al.
patent: 6589136 (2003-07-01), Ephraim et al.
patent: 6655351 (2003-12-01), Sheidler et al.
patent: 6745727 (2004-06-01), Kramer et al.
patent: 6772714 (2004-08-01), Laird et al.

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