Fan system and method for controlling a fan motor
AssigneeRobert Bosch GmbH
InventorsRichard Vogt, Nikolas Haberl
Life of this patent
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Abstract
In a fan system for an internal combustion engine of a motor vehicle, having an electrical fan motor with a commutator, and having a control unit which detects a fault in the fan motor and switches said motor to a voltage-free state if the motor current reaches a predetermined load-dependent switch-off value, the invention proposes that the control unit controls the fan motor with at least a virtually maximum power for a predetermined period of time if the motor current reaches a load-dependent switching value which is lower than the associated switch-off value by a predetermined amount. As a result, the fan motor is not switched off in an undesirable manner if only contamination, but not blocking, is present.
Claims7
A fan system for carrying out controlled cooling for an internal combustion engine of a motor vehicle, having an electrical fan motor which has a commutator, and having a control unit for controlling the fan motor, the control unit being configured in such a manner that it detects a fault in the fan motor and switches said motor to a voltage-free state if the motor current reaches a predetermined load-dependent switch-off value, characterized in that the control unit controls the fan motor with at least a virtually maximum power for a predetermined period of time if the motor current reaches a load-dependent switching value which is lower than the associated switch-off value by a predetermined amount.
A method for controlling a DC fan motor for an internal combustion engine of a motor vehicle, an item of information relating to the current through the fan motor being determined, and a fault in the fan motor being detected and the fan motor being switched off if the motor current reaches a predetermined load-dependent switch-off value, characterized in that the fan motor is controlled with at least a virtually maximum power for a predetermined period of time if the motor current reaches a load-dependent switching value which is lower than the associated switch-off value by a predetermined amount.
Dependencies are inferred from the claim text.