Apparatus for controlling rotational speed of radiator fan
First Claim
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1. A system for cooling an radiator in an internal combustion engine, comprising:
- rotating means for generating a flow of air in contact with the radiator for cooling an engine coolant medium in the radiator;
electric driving means for driving said rotating means;
sensor means for issuing electric signals representing various cooling requirements of the engine;
first switch means, responsive to said electric signals indicating an engine cooling requirement which is larger than a predetermined value, for operating said electric driving means in order to obtain a weak cooling by the rotating means;
second switch means, responsive to said electric signals indicating an engine cooling requirement which is larger than a predetermined value, for operating said electric driving means in order to obtain a much stronger cooling by the rotating means; and
,timer means for detecting a predetermined short period after the start of the engine for preventing the operation of the second switch means irrespective of said large cooling requirement.
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Abstract
A cooling system for a radiator in an internal combustion engine is provided with a pair of fans connected to a first motor for a small electric current and a second motor for a large electric current, respectively. Relays are provided for operating the first and/or second motor sequentially in accordance with the degree of cooling requirement of the engine. A delay device is provided for delaying the operation of the relay(s) for attaining a stronger cooling requirement for a predetermined short period just after the engine is started. A generation of rush current in the relay contacts is prevented.
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Citations
7 Claims
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1. A system for cooling an radiator in an internal combustion engine, comprising:
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rotating means for generating a flow of air in contact with the radiator for cooling an engine coolant medium in the radiator; electric driving means for driving said rotating means; sensor means for issuing electric signals representing various cooling requirements of the engine; first switch means, responsive to said electric signals indicating an engine cooling requirement which is larger than a predetermined value, for operating said electric driving means in order to obtain a weak cooling by the rotating means; second switch means, responsive to said electric signals indicating an engine cooling requirement which is larger than a predetermined value, for operating said electric driving means in order to obtain a much stronger cooling by the rotating means; and
,timer means for detecting a predetermined short period after the start of the engine for preventing the operation of the second switch means irrespective of said large cooling requirement. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification