Method for controlling cooling fans
First Claim
1. A method for controlling a cooling system for an internal combustion engine having first and second cooling fans, comprising:
- stopping both of said first and second cooling fans when an engine operating condition becomes a predetermined condition;
operating said first cooling fan at a first rotational frequency which is greater than a combustion frequency of said internal combustion engine when said engine operating condition does not become said predetermined condition; and
operating said second cooling fan at a second rotational frequency which is less than said combustion frequency when said engine operating condition does not become said predetermined condition.
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Accused Products
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.
21 Citations
17 Claims
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1. A method for controlling a cooling system for an internal combustion engine having first and second cooling fans, comprising:
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stopping both of said first and second cooling fans when an engine operating condition becomes a predetermined condition; operating said first cooling fan at a first rotational frequency which is greater than a combustion frequency of said internal combustion engine when said engine operating condition does not become said predetermined condition; and operating said second cooling fan at a second rotational frequency which is less than said combustion frequency when said engine operating condition does not become said predetermined condition. - View Dependent Claims (2, 3, 4)
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5. A method for controlling a cooling system for an internal combustion engine having first and second cooling fans, the method comprising:
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a first mode wherein said first cooling fan is operated at a first rotational frequency which is greater than a combustion frequency of said internal combustion engine and said second cooling fan is operated at a second rotational frequency which is less than said combustion frequency; a second mode wherein the rotational frequencies of said first and second cooling fans vary as an operating condition varies; and a third mode wherein both of the first and second fans are stopped. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A cooling system for an internal combustion engine, comprising:
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a heat exchanger; a first cooling fan which provides cooling air to said heat exchanger; a second cooling fan which provides cooling air to said heat exchanger; and a controller which stops both of said first and second cooling fans when an engine operating condition becomes a predetermined condition and operates said first cooling fan at a first rotational frequency which is greater than a combustion frequency of said internal combustion engine when said engine operating condition does not become said predetermined condition and operates said second cooling fan at a second rotational frequency which is less than said combustion frequency when said engine operating condition does not become said predetermined condition. - View Dependent Claims (13, 14, 15)
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16. A computer readable storage medium having stored data representing instructions executable by a computer to control a cooling system for an internal combustion engine having first and second cooling fans, said storage medium comprising the instructions to:
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stop both of said first and second fans when an engine operating condition becomes a predetermined condition; operate said first cooling fan at a first rotational frequency which is greater than a combustion frequency of said internal combustion engine when said engine operating condition does not become said predetermined condition; and operate said second cooling fan at a second rotational frequency which is less than said combustion frequency when said engine operating condition does not become said predetermined condition. - View Dependent Claims (17)
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Specification