Method for controlling cooling fans

Internal-combustion engines – Cooling – Automatic coolant flow control

Reexamination Certificate

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Details

C123S041120, C123S041490, C318S471000

Reexamination Certificate

active

07347167

ABSTRACT:
A method for controlling a cooling system for an internal combustion engine having first and second cooling fans is provided, comprising operating the first cooling fan at a first rotational frequency which is greater than a combustion frequency of the internal combustion engine and operating the second cooling fan at a second rotational frequency which is less than the combustive vibration frequency of the internal combustion engine. Since the rotational frequencies of the first and second cooling fans are different from the combustion frequency of the internal combustion engine, the resonance between the rotational vibration of the cooling fans and the combustive vibration of the internal combustion engine may be prevented. Also, since the rotational frequencies of the first and second cooling fans are different from each other so that the resonance between their rotational vibrations may be prevented.

REFERENCES:
patent: 4036432 (1977-07-01), George
patent: 4651922 (1987-03-01), Noba
patent: 4765284 (1988-08-01), Kanazawa et al.
patent: 4977862 (1990-12-01), Aihara et al.
patent: 6933687 (2005-08-01), Makaran et al.
patent: 2004/0066156 (2004-04-01), Makaran et al.
patent: 2004/0206099 (2004-10-01), Kim
patent: 2001-193460 (2001-07-01), None
patent: 2004-044507 (2004-02-01), None
European Search Report for European Patent Application No. 06003824.7 dated May 31, 2006.
English Translation of Specification and Drawings of JP2001-193460A.

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