Fan revolution speed control method

Details Fan revolution speed control method Fan revolution speed control method

2007-10-02

2007-10-02

Kershteyn, Igor (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control means responsive to, or...

C060S422000, C060S256000, C060S468000

Reexamination Certificate

active

10519904

ABSTRACT:
The invention is a fan revolution control method for controlling a pump-motor system, by controlling the fan revolution speed of a cooling fan adapted to be rotated by a fan motor to cool cooling target fluids. The pump-motor system drives the fan motor by a hydraulic fluid fed from a fan pump driven by an engine. The pump-motor system is controlled so the fan revolution speed starts from the minimum fan revolution speed when the engine is started up; the minimum fan revolution speed is maintained for at least several seconds; after the elapse of several seconds, the fan revolution speed is gradually increased from the minimum fan revolution speed. The fan revolution speed reaches a target fan revolution speed over a period of at least several seconds. The method prevents generation of peak pressure or pressure hunting.

REFERENCES:
patent: 4798050 (1989-01-01), Nakamura et al.
patent: 4798177 (1989-01-01), Oomura et al.
patent: 4941437 (1990-07-01), Suzuki et al.
patent: 6195989 (2001-03-01), Hall et al.
patent: 01-147113 (1989-06-01), None
patent: 2000-110560 (2000-04-01), None
patent: 2000-213350 (2000-08-01), None
Patent Abstracts of Japan for JP01-147113 published Jun. 8, 1989.
Patent Abstracts of Japan for JP2000-110560 published Apr. 18, 2000.
Patent Abstracts of Japan for JP2000-213350 published Aug. 2, 2000.

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