Apparatus for regulating the rotation of a hydraulically-operated cooling fan
AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft
InventorsAlbert Nolte, Herbert Schleiermacher, Erich Arbeiter
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Abstract
A regulation apparatus for determining the flow of fluid to a hyraulically-operated cooling fan of an air-cooled internal combustion engine includes an electromagnetic valve connected in the fluid line to the cooling fan, a control unit which sends a signal to the electromagnetic valve to control its operation, and multiple sensor elements which are positioned in or near the engine to detect the various parameters which affect its operation, the sensor elements sending electrical input signals to the control unit.
Claims5
In an air-cooled internal combustion engine which includes a hydraulically-operated cooling fan and a hydraulic line circulating fluid to said hydraulically-operated cooling fan to operate said cooling fan, the improvement wherein a regulation apparatus is utilized to control the flow of fluid through said hydraulic line, said regulation apparatus including
- an electromagnetic valve connected to said hydraulic line to control the flow of fluid therethrough,
- a control unit electrically connected to said electromagnetic valve so as to send an electrical control signal thereto which has a voltage which oscillates from a maximum value to a minimum value, and said control unit being capable of controlling the characteristics of said electrical control signal such that the ratio of time periods during which the voltage thereof is at its maximum value and at its minimum value is changeable,
- a multiplicity of sensor elements electrically connected to said control unit, said sensor elements being positioned to detect various operational parameters which affect the operation of said engine, the electrical signals from said sensor elements being sent to said control unit to enable said control unit to control the electromagnetic valve to operate such that the amount of fluid passing therethrough will be continuously controlled, the speed of rotation of said cooling fan thus always being maintained at the optimum rate for cooling the engine.
Dependencies are inferred from the claim text.