ELECTRIC PARKING BRAKE DEVICE, AND ELECTRIC BRAKE DEVICE

WIPO Patent Application WO/2019/093030

A1

The objective of the present invention is to provide an electric parking brake device which accurately estimates at least a torque constant, and which does not use rotational speed information from a rotation sensor when obtaining the torque constant (φ). This electric parking brake device is provided with a cutoff current threshold computing unit (29) for controlling a thrust force of a piston, wherein: at least a voltage value (V) and a current value (I) applied to an electric motor (24) are calculated a plurality of times by means of a torque constant computing unit (29) during a current decreasing sector before a current following an inrush current generated at the start of energization of the electric motor (24) reaches a constant current sector; a computation sector in which a torque constant (φ) can be computed using the plurality of voltage values and current values is set; the torque constant (φ) is estimated by computation in the computation sector; and a cutoff current threshold is computed by the cutoff current threshold computing unit (29) on the basis of the estimated torque constant (φ).

JP7270767	Inspection unit for operating devices of electrical equipment
JP7398345	Disc brake and planetary gear reduction mechanism

KAI RYU (JP)
ITO TAKAHIRO (JP)
AJIMA TOSHIYUKI (JP)
SETO SHINJI (JP)
OHTANI YUKIO (JP)
NISHINO KIMIO (JP)
KOBUNE TATSURO (JP)
SUZUKI SOTA (JP)
KOJIMA TAKAO (JP)

PCT/JP2018/037154

May 16, 2019

October 04, 2018

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HITACHI AUTOMOTIVE SYSTEMS LTD (JP)

B60T13/74; B60T8/00; F16D65/14; H02P29/032; F16D121/24

WO2018135512A1

2018-07-26

JP2015519243A	2015-07-09
JP2013159269A	2013-08-19
JP2017123753A	2017-07-13

POLAIRE I.P.C. (JP)

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