ELECTRIC POWER STEERING DEVICE

WIPO Patent Application WO/2018/037980

A1

[Problem] To provide an electric power steering device that has a plurality of dead time compensation functions that compensate inverter dead time and, without tuning work: gradually, by mixing, switches and compensates dead time compensation functions in accordance with a steering state; improves steering performance; improves current waveform distortion; improves current control responsiveness; and suppresses noise, vibration and ripples. [Solution] A vector control-type electric power steering device that: calculates a steering assistance command value for d and q axes on the basis of at least steering torque; calculates d and q axes current command values from the steering assistance command values; converts the d and q axes current command values to 3-phase Duty command values; drive controls a 3-phase brushless motor by using a PWM control inverter; and applies assistance torque to a vehicle steering mechanism. The electric power steering device has a plurality of dead time compensation functions having differing compensation performance on inverter dead time and performs dead time compensation by mixing and gradually switching from one dead time compensation function to another dead time compensation function.

JP3669827	ROTARY MACHINE HAVING NO BEARING
JP5916343	A motor controlling device, a motor control method
WO/2014/162192	CONTROL SYSTEM FOR ROTARY ELECTRIC MACHINE AND METHOD FOR CONTROLLING THE SAME

TAKASE HIROAKI (JP)
MINAKI RYO (JP)
SAWADA HIDEKI (JP)
SUGAWARA TAKAYOSHI (JP)

PCT/JP2017/029444

March 01, 2018

August 16, 2017

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NSK LTD (JP)

H02P21/06; B62D5/04; B62D6/00; H02P27/08

WO2016125774A1

2016-08-11

JP2014212612A	2014-11-13
JP2016055825A	2016-04-21

See also references of EP 3477848A4

AGATA Yuzo (JP)

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