ELECTROMAGNETIC SWITCHING CONTROL DEVICE

WIPO Patent Application WO/2020/079998

A1

Provided is an electromagnetic switching control device in which a control unit is able to predict a near-future value of an operation coil current and perform control so that the current does not fall short of a holding current threshold, and it is possible to stabilize the contact pressure. An electromagnetic switching control device 1 for opening/closing 13 by means of an electromagnetic force corresponding to energization of operation coils 16, 17, wherein the electromagnetic switching control device 1 has PWM control units 21-23 for performing PWM pulse width modulation control on the current value A of currents flowing through the operation coils 16, 17. The PWM control units 21-23 estimate the near-future predicted current value of the currents flowing through the operation coils 16, 17 using the terminal voltage V of the operation coils 16, 17, and perform PWM control on the basis of the near-future predicted current values. The predicted current value Y is estimated using the impedance Z of the operation coils 16, 17. For the impedance, there is used a constant approximated over a prescribed period from the recent past to the present, with respect to a variable obtained from the current values A1, A2 and the terminal voltages V1, V2 of the operation coils 16, 17. The impedance is renewed every prescribed period.

MIURA HIKARU (JP)
KANAI TOMONORI (JP)
MACHIDA AKIHIRO (JP)
YAMAUCHI TATSUMI (JP)

PCT/JP2019/035826

April 23, 2020

September 12, 2019

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HITACHI AUTOMOTIVE SYSTEMS LTD (JP)

H01H47/04

WO2017159070A1

2017-09-21

JP2011004103A	2011-01-06
JP2018133949A	2018-08-23

TODA Yuji (JP)

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