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公开(公告)号：US10907628B2
公开(公告)日：2021-02-02
申请号：US15774333
申请日：2016-10-25
Applicant: DENSO CORPORATION
Inventor： Koji Sakai
Abstract: An inverter is disposed at a position on the upstream side relative to a compression mechanism along the flow of a refrigerant and the position cooled by the refrigerant. A motor is disposed at a position heated by the refrigerant compressed by the compression mechanism. A control device changes an upper limit value of a driving current supplied to the motor on the basis of at least one of first information relating to the temperature of the motor or second information relating to the temperature of the inverter.
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公开(公告)号：US10801497B2
公开(公告)日：2020-10-13
申请号：US15744184
申请日：2016-07-28
Applicant: DENSO CORPORATION
Inventor： Shinji Nakamoto , Koji Sakai , Akihiro Imura , Akitomo Yamanaka
IPC: F04C28/06 , F25B1/04 , F25B1/10 , F25B49/02 , H02P6/30 , F04B49/02 , F04B35/04 , F04B49/20 , F25B5/04 , F04C18/02
Abstract: A controller that controls an electric compressor, which is mounted to a vehicle and configures a two-stage compression refrigeration cycle device, has a deceleration section, an operation stop section, and a restart section. The deceleration section reduces a rotational speed of an electric motor by controlling an AC current which is output to the electric motor, when a two-stage compression mode, in which an intermediate-pressure refrigerant flows into the electric compressor from an intermediate-pressure port, is performed and an operation stop request to stop the electric compressor is made. The operation stop section stops the electric motor after the deceleration section reduces the rotational speed of the electric motor. The restart section restarts the electric compressor when the operation stop request is canceled after the operation stop section stops the electric compressor.
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公开(公告)号：US10362701B2
公开(公告)日：2019-07-23
申请号：US15511682
申请日：2015-09-24
Applicant: DENSO CORPORATION
Inventor： Koji Sakai
IPC: H02K11/33 , H05K7/14 , F04B39/06 , H02K15/02 , H02K11/30 , F04B35/04 , F04B39/12 , F04B39/14 , H02M7/00 , H05K7/20 , F04D13/06 , F04D29/043 , H02K5/22 , H02M7/537 , H05K13/00 , H02K9/19 , H02K15/00 , H02M7/5387
Abstract: An electrical device includes two or more electrical components that configure an electrical circuit, at least one or more mechanical component that supports the two or more electrical components and is fixed to the two or more electrical components, and a position-adjustment structure that adjusts positions of the two or more electrical components relative to the one or more mechanical component with the at least two or more electrical components being united together, before the one or more mechanical component is fixed to the two or more electrical components.
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公开(公告)号：US10250174B2
公开(公告)日：2019-04-02
申请号：US15576317
申请日：2016-05-19
Applicant: DENSO CORPORATION
Inventor： Koji Sakai , Akitomo Yamanaka
Abstract: A motor driving device for a motor having a stator and a rotor rotationally driven by an input of an AC voltage includes: an inverter circuit having multiple units corresponding to multiple phases respectively, each unit having a pair of a switching element and a reflux diode connected in anti-parallel to the switching element; and a control device controlling the inverter circuit to convert a DC voltage into the AC voltage and to output the AC voltage to the stator coil. The control device includes: a field weakening control unit adjusting the AC voltage to control a magnetic field of the stator coil to weaken a field magnetic flux of the rotor; and a regenerative current control unit switching an anti-regenerative side switching element to flow a regenerative current when the AC voltage stops while the field weakening control unit performs the field weakening control.
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公开(公告)号：US10220677B2
公开(公告)日：2019-03-05
申请号：US15549431
申请日：2016-01-29
Applicant: DENSO CORPORATION
Inventor： Teruaki Ohyama , Koji Sakai , Yuji Kamiya , Tomoyuki Sumi , Shinji Nakamoto
Abstract: An air conditioner for a vehicle has a compressor, a radiator, a first pressure reducer, a gas-liquid separator, a second pressure reducer, an exterior heat exchanger, an intermediate pressure refrigerant passage, a switching device, and a controller. The controller operates the switching device to switch from a refrigerant circuit of a two-stage compression mode to a refrigerant circuit of a single-stage compression mode when a compressor stop signal is output in the two-stage compression mode. The single-stage compression mode is a mode that blocks at least a flow of an intermediate-pressure refrigerant into the intermediate pressure refrigerant passage and makes refrigerant remained in the intermediate pressure refrigerant passage to flow out of the intermediate pressure refrigerant passage. The controller stops the compressor after controls the compressor to continue operating for a specified time in the single-stage compression mode. The controller restarts the compressor when the compressor stop signal is canceled.
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Patent Agency Ranking
公开(公告)号：US10164558B2
公开(公告)日：2018-12-25
申请号：US15752950
申请日：2016-06-23
Applicant: DENSO CORPORATION
Inventor： Koji Sakai
Abstract: An electric motor control device includes a control unit that controls operation of a drive circuit supplying electric power to an electric motor and a current sensor that detects current generated in the electric motor. The control unit detects fundamental high frequency current generated when the electric motor is applied with fundamental high frequency voltage for estimating the magnetic pole position, selects first electric angle and second electric angle corresponding to a d-axis direction of the magnetic pole position, detects first specific high frequency current generated when a position of the first electric angle is applied with specific high frequency voltage and second specific high frequency current generated when a position of the second electric angle is applied with the specific high frequency voltage, and compares the first and the second specific high frequency currents to estimate a positive d-axis direction of the magnetic pole position.
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公开(公告)号：US09982922B2
公开(公告)日：2018-05-29
申请号：US14654267
申请日：2013-12-05
Applicant: DENSO CORPORATION
Inventor： Koji Sakai , Hiroki Ishii
IPC: F25B31/02 , F04B17/03 , F04B35/04 , F04B39/00 , F04C23/00 , F04C18/02 , F04C29/00 , H02K7/14 , H02M7/00 , H02K11/33
CPC classification number: F25B31/026 , F04B17/03 , F04B35/04 , F04B39/0094 , F04C18/0223 , F04C23/008 , F04C29/0085 , F04C2240/808 , F25B31/023 , H02K7/14 , H02K11/33 , H02M7/003
Abstract: A motor unit, which drives a compressor unit, includes a stator, which generates a rotating magnetic field, and a rotor, which is rotated about a rotational axis by the rotating magnetic field at an inner side of the stator. A drive circuit unit is placed at the inner side of the stator such that a position of the drive circuit unit in a direction of the rotational axis overlaps with the stator.
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公开(公告)号：US09438160B2
公开(公告)日：2016-09-06
申请号：US14418180
申请日：2013-07-29
Applicant: DENSO CORPORATION
Inventor： Kouichi Yamada , Koji Sakai
CPC classification number: H02P27/085 , B60L15/02 , B60L15/20 , B60L2270/147 , H02P5/74 , Y02T10/645 , Y02T10/646 , Y02T10/72 , Y02T10/7275
Abstract: A motor drive apparatus includes multiple inverter circuits provided corresponding, respectively, to multiple motors, a controller configured to control the inverter circuits using switching signals, a detector configured to detect a current ripple generated by switching operations of the inverter circuits. The controller operates in a first mode and a second mode. In the first mode, carrier wave frequencies of reference carrier waves used to generate the switching signals for all the motors are set to the same basic frequency. In the second mode, the carrier frequency of the motor having a higher priority is set to the basic frequency, and the carrier frequency of the motor having a lower priority is set to a preset shift frequency. When the current ripple is not less than a predetermined value, a transition occurs from the first mode to the second mode.
Abstract translation: 电动机驱动装置包括分别与多个电动机对应地设置的多个逆变器电路，配置为使用开关信号来控制逆变器电路的控制器，被配置为检测由逆变器电路的开关动作产生的电流纹波的检测器。 控制器以第一模式和第二模式操作。 在第一模式中，用于产生用于所有电动机的开关信号的参考载波的载波频率被设置为相同的基本频率。 在第二模式中，具有较高优先级的电动机的载波频率被设置为基本频率，并且将具有较低优先级的电动机的载波频率设置为预设的频移。 当电流纹波不小于预定值时，从第一模式发生到第二模式。
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公开(公告)号：US20150155804A1
公开(公告)日：2015-06-04
申请号：US14412252
申请日：2013-06-06
Applicant: DENSO CORPORATION
Inventor： Koji Sakai
IPC: H02P6/00
CPC classification number: H02P6/28 , H02M1/15 , H02M7/53875 , H02M7/5395 , H02P6/08 , H02P27/06 , H02P27/085 , H02P2209/13
Abstract: A motor driving device includes an inverter circuit having switching elements; and a control device controlling the switching of the switching elements. The control device sets a carrier frequency to f1 when a two-phase modulation scheme is selected, and sets the carrier frequency to f0, which is half of the carrier frequency f1, when a three-phase modulation scheme is selected. Thereby, the frequency of the secondary component of a current flowing in a filter circuit of when selecting the three-phase modulation scheme may be deviated from the resonance frequency of the filter circuit. Accordingly, the current ripple generated in the filter circuit may be reduced even when selectively switching the modulation scheme for the PWM modulation among a plurality of modulation schemes.
Abstract translation: 电动机驱动装置包括具有开关元件的逆变器电路; 以及控制开关元件的切换的控制装置。 当选择两相调制方案时，控制装置将载波频率设置为f1，并且当选择三相调制方案时，将载波频率设置为f0，其为载波频率f1的一半。 因此，当选择三相调制方案时，在滤波电路中流动的电流的次要分量的频率可能偏离滤波器电路的谐振频率。 因此，即使在多个调制方案中选择性地切换用于PWM调制的调制方案时，也可能降低滤波电路中产生的电流纹波。
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公开(公告)号：US11472257B2
公开(公告)日：2022-10-18
申请号：US16675081
申请日：2019-11-05
Applicant: DENSO CORPORATION
Inventor： Koji Sakai , Yasuhiro Sekito
Abstract: An air-conditioning control ECU is an air-conditioning control apparatus mounted in an automated driving vehicle, and includes an occupant determining section that determines whether an occupant is in the automated driving vehicle, and a window operation controlling section that executes a window operation air-conditioning control for performing cabin air-conditioning when a determination result of the occupant determining section indicates the automated driving vehicle is in an unmanned traveling state.
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