公开(公告)号：US20200091850A1

公开(公告)日：2020-03-19

申请号：US16571446

申请日：2019-09-16

Applicant: DENSO CORPORATION

Inventor： Go ENDOH ,  Masaya TAKI ,  Hiroyasu OTAKE

IPC: H02P21/13 ,  H02P21/22 ,  B62D5/04

Abstract: In a motor driving device, a current detector detects a value of the motor current, and a limit variable calculator calculates a calculation value of a limit variable for limiting the command current. A determiner determines, based on a relationship between the value of the motor current and the calculation value of the limit variable, whether the motor current is in a less-response situation to change of the command current. A current limiter determines whether to limit a value of the command current based on the calculation value of the limit variable in accordance with a result of the determination of whether the motor current is in the less-response situation to change of the command current.

公开(公告)号：US20190248407A1

公开(公告)日：2019-08-15

申请号：US16267743

申请日：2019-02-05

Applicant: DENSO CORPORATION

Inventor： Koichi NAKAMURA ,  Nobuyori NAKAJIMA ,  Go ENDOH ,  Yosuke OGI ,  Atsuko OKA

IPC: B62D5/04

CPC classification number: B62D5/0463 ,  B62D5/0481

Abstract: A steering control apparatus controlling an electric power steering apparatus includes a first control part and a second control part. The first control part communicates with an external device and executes a specific process. The second control part communicates with the first control part and executes the specific process. The first control part can acquire first information and second information. When all of the first information and the second information are positive, the first control part transmits positive information to the external device. When a part of the first information and the second information is negative, the first control part transmits negative information to the external device.

公开(公告)号：US20180167019A1

公开(公告)日：2018-06-14

申请号：US15838125

申请日：2017-12-11

Applicant: DENSO CORPORATION

Inventor： Go ENDOH

IPC: H02P31/00

CPC classification number: H02P31/00 ,  B62D5/04 ,  B62D6/00 ,  H02P29/60 ,  H02P29/68

Abstract: A self-holding termination determination section has an overheat protection map that defines a relationship between a current value and a maximum temperature of a protected portion to which a current value is applied, and sets a limit temperature corresponding to a required current value at next start time based on the map. The self-holding termination determination section calculates, as an evaluation temperature, temperature obtained by adding a performance assurance upper limit temperature, which assures output performance of a motor at the next start time, to the sum of temperature rises. In a next time performance determination process, if the evaluation temperature for all protected portions has fallen below the limit temperature, the self-holding termination determination section determines that a performance assurance condition is met, and terminates power self-holding based on at least the fact that the performance assurance condition is met.

公开(公告)号：US20200207408A1

公开(公告)日：2020-07-02

申请号：US16711794

申请日：2019-12-12

Applicant: DENSO CORPORATION

Inventor： Koichi NAKAMURA ,  Nobuyori NAKAJIMA ,  Go ENDOH ,  Yosuke OGI ,  Atsuko OKA ,  Shuji KURAMITSU ,  Takashi SUZUKI ,  Haruo SUZUKI

IPC: B62D5/04 ,  B62D15/02

Abstract: A motor controller for controlling a motor includes first and second angle sensors detecting motor rotation, and first and second detection circuits detecting rotation number information based on sensor output from the angle sensors. Further, the motor controller includes a steer angle information obtainer obtaining steer angle information involving steering of a vehicle from an external sensor, which is different from the angle sensors, and an abnormality determiner determining abnormality of information that has a matching degree of lower than a preset value when post-conversion information, or value measured by the same characteristics. This information is compared with each other after conversion from the rotation number information and from the steer angle information, and is used by a control amount calculator to calculate a control amount of the motor based on the information determined as having no abnormality by the abnormality determiner.

公开(公告)号：US20190241214A1

公开(公告)日：2019-08-08

申请号：US16264282

申请日：2019-01-31

Applicant: DENSO CORPORATION

Inventor： Atsuko OKA ,  Nobuyori NAKAJIMA ,  Go ENDOH ,  Koichi NAKAMURA ,  Yosuke OGI

IPC: B62D6/10 ,  B62D5/04

CPC classification number: B62D6/10 ,  B62D5/0463

Abstract: Inverter circuits are provided for motor winding sets, respectively. Control units are provided for the motor winding sets to generate control signals related to driving of the inverter circuits and control currents flowing through the motor winding sets, respectively, thereby controlling driving of a motor. The control mode includes a manual steering mode for controlling the motor according to a steering operation on a steering wheel by a driver and an automatic steering mode for controlling the motor independently of the steering operation on the steering wheel by the driver. The control units are capable of switching the control modes and differentiate the current control according to the control mode. By making the current control different according to the control mode, it is possible to attain optimal characteristics which correspond to each control mode.

公开(公告)号：US20200207406A1

公开(公告)日：2020-07-02

申请号：US16711857

申请日：2019-12-12

Applicant: DENSO CORPORATION

Inventor： Go ENDOH ,  Nobuyori NAKAJIMA ,  Koichi NAKAMURA ,  Hiroyasu OTAKE

IPC: B62D5/04 ,  H02P27/06

Abstract: Each of a plurality of microcomputers outputs a motor drive signal, which is generated based on a current command value and a current limit value as a control amount command value and a control amount limit value, to each motor drive circuit. When an OFF determination of an own microcomputer is made, each microcomputer executes first end processing as a first stage of end processing and transmits an OFF determination signal to the other microcomputer. When the OFF determination signal is received from the other microcomputer, each microcomputer determines that the OFF determination has been made and starts second end processing which gradually decreases the current command value or the current control limit value from a present value. When the second end processing is completed and power-off preparation of the own microcomputer and the other microcomputer is completed, each microcomputer executes final end processing for turning off the power supply relay.

公开(公告)号：US20200180685A1

公开(公告)日：2020-06-11

申请号：US16702912

申请日：2019-12-04

Applicant: DENSO CORPORATION

Inventor： Takashi SUZUKI ,  Shuji KURAMITSU ,  Nobuyori NAKAJIMA ,  Go ENDOH ,  Haruo SUZUKI ,  Koichi NAKAMURA ,  Yosuke OGI ,  Atsuko OKA

IPC: B62D5/04 ,  B62D15/02 ,  B62D6/00 ,  H02P6/22

Abstract: A steering system in a vehicle includes a plurality of subsystems provided with a control unit. The control unit includes a storage unit storing steer angle information regarding a steer angle of one of a steering mechanism and a steered mechanism when the steering mechanism or the steered mechanism stops, an abnormality determiner determining abnormality of the motor rotation detection value and the detection circuit in the plurality of subsystems at a start time of a motor based on a comparison of at least two parameters, and a steer angle calculator calculating the steer angle based on the parameters having been determined by the abnormality determiner as not abnormal.

公开(公告)号：US20180241339A1

公开(公告)日：2018-08-23

申请号：US15959903

申请日：2018-04-23

Applicant: DENSO CORPORATION

Inventor： Go ENDOH

IPC: H02P29/64 ,  H02P21/22 ,  B62D5/04

CPC classification number: H02P29/64 ,  B62D5/0409 ,  H02P21/22

Abstract: A motor control apparatus that estimates a temperature of a temperature estimation target element at a time of energizing the motor and drives a motor by controlling an electric power is provided. The motor control apparatus includes a primary delay arithmetic unit that outputs a primary delay response as an amount of temperature change, a sensor value adder that adds a sensor value of a temperature sensor to the amount of temperature change, an offset adder that adds an offset temperature to an output of the sensor value adder, a response constant determination portion that determines the gain and the time constant, and an offset temperature determination portion. At least one of the response constant and the offset temperature is changed according to a supply voltage or an input voltage.

公开(公告)号：US20220224275A1

公开(公告)日：2022-07-14

申请号：US17657068

申请日：2022-03-29

Applicant: DENSO CORPORATION

Inventor： Kouichi NAKAMURA ,  Nobuyori NAKAZIMA ,  Go ENDOH

IPC: H02P29/024 ,  B62D5/04

Abstract: A current detection unit includes current detection elements provided to phases on a high potential side of an upper arm element or on a low potential side of a lower arm element. A detection target element is the upper arm element or the lower arm element to which the current detection elements are provided. A target duty is a duty ratio of the detection target element. The control unit includes a current acquisition unit, an energization control unit, and an abnormality determination unit. The current acquisition unit acquires a current detection value from the current detection unit. The abnormality determination unit performs an abnormality determination based on the current detection value. The abnormality determination unit varies a determination threshold, which is used for the abnormality determination based on the current detection value, according to the target duty.

公开(公告)号：US20200313590A1

公开(公告)日：2020-10-01

申请号：US16817964

申请日：2020-03-13

Applicant: DENSO CORPORATION

Inventor： Hiroyasu OTAKE ,  Nobuyori NAKAJIMA ,  Go ENDOH

IPC: H02P21/22 ,  H02P25/22 ,  H02P27/08 ,  H02M7/5387 ,  B62D5/04

Abstract: A motor control device includes a plurality of systems capable of controlling current supply to a motor. Each microcomputer of first and second systems is configured to communicate information of the own system and the other system by inter-computer communication and has an independent ground potential. A power supply current flowing between a power supply and a power converter is assumed to be positive and negative in a power running state and a regeneration state. Each microcomputer monitors the power supply current of each system by the inter-computer communication, and executes a power supply current balancing process of limiting a current command value or a voltage command value of at least one of the two systems thereby to decrease a power supply current difference between the two systems when the power supply current difference between the two systems exceeds a target value.