Apparatus for controlling rotational speed of radiator fan
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMasahiko Noba
Life of this patent
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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.
Claims7
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.
Dependencies are inferred from the claim text.