公开(公告)号：US11757395B2

公开(公告)日：2023-09-12

申请号：US17390384

申请日：2021-07-30

Applicant: DENSO CORPORATION

Inventor： Yoshihiro Shamoto ,  Hiroyuki Oyanagi

IPC: H02P27/08 ,  H02M7/5387 ,  H02M3/158

CPC classification number: H02P27/085 ,  H02M7/53871 ,  H02P27/08 ,  H02M3/158 ,  H02P2201/09

Abstract: An electric motor control device includes an electronic control unit configured to perform switching control of a switching element of an inverter in PWM control mode when a modulation degree is less than a first predetermined value, perform switching control of the switching element in square wave control mode when the modulation degree is greater than or equal to a second predetermined value, and perform switching control of the switching element in intermediate control mode when the modulation degree is greater than or equal to the first predetermined value and less than the second predetermined value. The intermediate control mode uses a switching pattern in which, in a pulse pattern in the square wave control mode, a slit or a short pulse having the same width as the slit is formed according to whether a pulse is present at the time when a phase current crosses zero.

公开(公告)号：US10723233B2

公开(公告)日：2020-07-28

申请号：US16269835

申请日：2019-02-07

Applicant: DENSO CORPORATION

Inventor： Yoshihiro Shamoto ,  Kazuhito Hayashi ,  Hiroyuki Oyanagi

IPC: H02P23/00 ,  H02P25/00 ,  H02P27/00 ,  B60L15/22 ,  H02P27/08 ,  B60L15/08 ,  H02P23/04 ,  B60L15/06 ,  H02P21/05 ,  H02P29/50

Abstract: A controller of an electrically powered vehicle includes an electronic control unit. The electronic control unit performs a switching control by a square wave control in a first switching mode when a rotation speed of the motor is equal to or higher than a first predetermined rotation speed. The electronic control unit performs the switching control by the square wave control in a second switching mode when the rotation speed of the motor is lower than the first predetermined rotation speed. The first predetermined rotation speed is a rotation speed lower than a first resonance region. The first switching mode is a mode of a switching pattern that suppresses LC resonance in the first resonance region. The second switching mode is a mode of a switching pattern that suppresses LC resonance in a second resonance region lower than the first predetermined rotation speed.