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US 9,428,063 B2Granted
Mild hybrid system and method for controlling the same
AssigneeHyundai Motor Company
InventorJun Yong Lee
Life of this patent
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Abstract
A mild hybrid system according embodiments of the invention may include: a motor-alternator; an inverter for controlling electrical energy flow to and from the motor-alternator; an electrical energy storage for storing electrical energy generated by the motor-alternator; and a unidirectional DC/DC buck converter including a bypass means for providing a physical connection between the motor-alternator and a vehicle electrical load. With the system, the manufacturing cost can be reduced, packaging process can be simplified, and an additional cooling device is not required.
Claims7
A method for a mild hybrid system, the method comprising:
- determining whether a current electrical load is greater than a reference electrical load;
- determining whether a unidirectional DC/DC buck converter is in a bypass state if it is determined that the current electrical load is greater than the reference electrical load;
- disconnecting an electrical energy storage from a motor-alternator if it is determined that the unidirectional DC/DC buck converter is not in the bypass state;
- reducing the generation voltage of the motor-alternator to a voltage level of the reference electrical load when the electrical energy storage is disconnected from the motor-alternator;
- and
- allowing the unidirectional DC/DC buck converter to perform bypass when the voltage level of the motor-alternator is equal to the voltage level of the reference electrical load.
3 more elements
Dependencies are inferred from the claim text.