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US 6,520,279 B2Granted
Current-carrying control device and electric power steering apparatus
AssigneeOMRON Corporation
InventorsTetsuya Fukumoto, Takamoto Sawano, Yoshiteru Higashihara
Life of this patent
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Abstract
Current correction control is carried out by control process of a control circuit 13 that temperatures of the electromagnetic relays 18a and 18b are assessed one by one based on the detection temperature by the temperature sensor 18c, when the temperature assessed value rises over the predetermined value, the upper limit of the target current value of the motor 11 is decreased.
Claims7
An electric power steering apparatus comprising:
- an auxiliary motor connected to a steering system of a vehicle and generating a steering-assistance torque;
- a bridge circuit having a plurality of switching elements and for driving said auxiliary motor;
- a relay provided at a current-carrying line of said auxiliary motor;
- a temperature sensor detecting a temperature at a designated portion where a temperature of said relay can be detected or calculated, wherein said temperature sensor measures a temperature of a board where said relay is mounted as the temperature of said designated portion;
- and
- a current control unit carrying out a current correction control for correcting a current flowing through said relay based on a detection temperature detected by said temperature sensor.
3 more elements
Dependencies are inferred from the claim text.