公开(公告)号：US10562563B2

公开(公告)日：2020-02-18

申请号：US16404447

申请日：2019-05-06

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Tomonobu Koseki ,  Tomishige Yatsugi ,  Fumiya Iijima

IPC: B62D5/04 ,  H02P29/032 ,  H02P27/08 ,  B62D6/00 ,  H02P29/028 ,  H02P29/68 ,  H02P29/024

Abstract: Provided is a control device 150 for an electric motor 140 which includes multiple energization systems each including an inverter and coils corresponding to different phases, and which generates a steering assist force in an electric power steering system. Control device 150 diagnoses whether any of inverters 1A and 1B fails, and, when either of the inverters is diagnosed as having failed, reduces the output ratio of the failing inverter to 0% while increasing the output ratio of the normally operating inverter to 100% so as to prevent a drop in the total output from all the inverters after the failure-positive diagnosis. If steering operation is performed after the failure-positive diagnosis, control device 150 performs overheat protection processing for gradually lowering the limit value for the total output from all the inverters in accordance with the sensed temperature of the normally operating inverter.

公开(公告)号：US10421482B2

公开(公告)日：2019-09-24

申请号：US15759759

申请日：2016-08-08

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Tomonobu Koseki ,  Tomishige Yatsugi ,  Fumiya Iijima

IPC: H02P27/06 ,  B62D5/04 ,  H02P29/032 ,  H02H3/16 ,  H02H7/122 ,  H02P25/22 ,  H02P29/024

Abstract: An electronic control unit includes: inverter circuits of first and second systems driving a multiphase motor with coil sets on a coil set basis; first and second phase potential detecting circuits detecting potentials of at least one phase of current supply paths from the inverter circuits to the coil set; and a diagnosis apparatus detecting a failure based on potentials detected by the first and second phase potential detecting circuits. Under condition that the inverter circuit of the first system turns ON the upper or lower arm switching element corresponding to one phase of the first coil set and turns OFF the other one so that the inverter circuit of the second system has a high-impedance output, when the potential detected by the second phase potential detecting circuit corresponds to an output potential of the inverter circuit of the first system, the diagnosis apparatus determines that a short-circuit failure occurs.

公开(公告)号：US10404202B2

公开(公告)日：2019-09-03

申请号：US16083845

申请日：2016-08-08

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Tomonobu Koseki ,  Tomishige Yatsugi ,  Fumiya Iijima

IPC: G01R31/02 ,  H02H3/04 ,  H02H7/08 ,  H02K11/00 ,  H02P29/024 ,  H02P25/22 ,  H02P27/08 ,  H02P29/028 ,  H02P29/032 ,  H02M7/5395 ,  H02P5/74

Abstract: Provided is an electronic control device including inverter circuits of first and second systems for driving a multiphase motor with first and second coil sets by use of upper and lower arm switching elements selectively controlled to be ON/OFF in each coil of the first and second coil sets. The upper arm switching elements of all phases in the inverter circuit of the first system are turned ON to apply a high potential to the first coil set, and the lower arm switching elements of all phases in the inverter circuit of the second system are turned ON to control the second coil set to a low potential. When a value of current flowing through the lower arm switching element in the inverter circuit of the second system is a predetermined value or more, it is determined that a power supply failure has occurred between the first and second systems.

公开(公告)号：US10363957B2

公开(公告)日：2019-07-30

申请号：US15510382

申请日：2015-09-09

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Tomonobu Koseki ,  Tomishige Yatsugi ,  Fumiya Iijima

IPC: B62D5/04 ,  B62D6/00 ,  H02P29/028 ,  H02P29/68 ,  H02P27/08 ,  H02P29/024

Abstract: Provided is a control device for an electric motor which includes multiple energization systems each including an inverter and coils corresponding to different phases, and which generates a steering assist force in an electric power steering system. Control device diagnoses whether any of inverters 1A and 1B fails, and, when either of the inverters is diagnosed as having failed, reduces the output ratio of the failing inverter to 0% while increasing the output ratio of the normally operating inverter to 100% so as to prevent a drop in the total output from all the inverters after the failure-positive diagnosis. If steering operation is performed after the failure-positive diagnosis, control device performs overheat protection processing for gradually lowering the limit value for the total output from all the inverters in accordance with the sensed temperature of the normally operating inverter.