Electric power steering system, control method thereof, and vehicle having the same
AssigneeHl Mando Corporation
InventorJaesang PARK
Life of this patent
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Abstract
The present embodiment relates to an electric power steering system, a control method thereof, and a vehicle having the same. More specifically, the present disclosure provides an electric power steering system, a control method thereof, and a vehicle having the same, which may detect and correct a current sensor calibration error by receiving a current measurement value of a current flowing in phases of a motor from a current sensor and comparing current measurement values corresponding to an input current based on the input current, thereby enabling more stable control of an inverter and a motor and preventing abnormal operation of the motor in advance.
Claims20
An electric power steering system comprising:
- a controller configured to generate and output a control signal for controlling a motor;
- an inverter configured to supply current to the motor according to the control signal;
- and
- a current sensor configured to detect a three-phase (U, V, and W) current supplied from the inverter to the motor,
- wherein the controller is configured to:
- receive a current measurement value detected from the current sensor, compare current measurement values of two phases (U-V, V-W, or W-U) among the current measurement values corresponding to an input current based on the input current, and determine a difference value,
- determine a calibration state of the current sensor as a normal state and output a confirmation signal for normality when the difference value is equal to or less than a preset reference value, and
- determine the calibration state of the current sensor as a fault state and output a warning signal for a current sensor calibration error when the difference value exceeds the preset reference value.
A control method of an electric power steering system, the control method comprising:
- a control signal outputting in which a controller generates and outputs a control signal for controlling a motor;
- a current supplying in which an inverter supplies current to the motor according to the control signal;
- a current detecting in which a current sensor detects three-phase (U, V, W) current supplied from the inverter to the motor;
- and
- a warning signal outputting in which the controller receives a current measurement value detected from the current sensor, compares current measurement values of two phases (U-V, V-W, or W-U) among the current measurement values corresponding to an input current based on the input current to determine a difference value, determines a calibration state of the current sensor as a normal state and outputs a confirmation signal for normality when the difference value is equal to or less than a preset reference value, and determines the calibration state of the current sensor as a fault state and outputs a warning signal for a current sensor calibration error when the difference value exceeds the preset reference value.
A vehicle comprising:
- a steering angle determinator configured to determine a steering angle based on a traveling path set by a traveling path setter;
- and an electric power steering system configured to assist an operating force of a steering wheel or enable steering based on the steering angle determined by the steering angle determinator,
- wherein the electric power steering system includes
- a controller configured to generate and output a control signal for controlling a motor,
- an inverter configured to supply current to the motor according to the control signal, and
- a current sensor configured to detect a three-phase (U, V, and W) current supplied from the inverter to the motor, and
- the controller is configured to:
- receive a current measurement value detected from the current sensor, compare current measurement values of two phases (U-V, V-W, or W-U) among the current measurement values corresponding to an input current based on the input current, and determine a difference value,
- determine a calibration state of the current sensor as a normal state and output a confirmation signal for normality when the difference value is equal to or less than a preset reference value, and
- determine the calibration state of the current sensor as a fault state and output a warning signal for a current sensor calibration error when the difference value exceeds the preset reference value.
Dependencies are inferred from the claim text.