Patents by Inventor Akira Sawada
Akira Sawada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 12128769Abstract: A control method for an electric vehicle equipped with an electric motor as a driving source, the method including: setting a torque target value as a target value related to a driving torque of the electric vehicle based on vehicle information; calculating a basic feedback compensation value based on a parameter indicating a rotation state of the electric motor and a vehicle model of the electric vehicle; calculating a first feedback compensation value by multiplying the basic feedback compensation value by a first gain; calculating a second feedback compensation value by extracting a predetermined specific frequency component from the basic feedback compensation value and multiplying the specific frequency component by a second gain; calculating a torque command value by correcting the torque target value by the first feedback compensation value and the second feedback compensation value; and driving the electric motor based on the torque command value.Type: GrantFiled: August 30, 2021Date of Patent: October 29, 2024Assignee: NISSAN MOTOR CO., LTD.Inventors: Akira Sawada, Takashi Nakajima, Kengo Fujiwara, Jun Motosugi, Katsunori Nakamura
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Patent number: 12071023Abstract: An electric vehicle control method for controlling a motor based on a torque command value in an electric vehicle includes: a disturbance torque estimation process of calculating a disturbance torque estimation value including an influence of a road surface gradient; a speed parameter acquisition process of acquiring a speed parameter relating to a vehicle speed; and a vehicle state control including a stop process of calculating a stopping basis torque target value so as to converge the torque command value to the disturbance torque estimation value in accordance with a decrease in the speed parameter, and a vibration damping process of calculating a stopping correction torque target value by performing filtering on the stopping basis torque target value.Type: GrantFiled: April 14, 2023Date of Patent: August 27, 2024Assignee: NISSAN MOTOR CO., LTD.Inventors: Hiroyuki Komatsu, Jun Motosugi, Akira Sawada, Yui Ito
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Publication number: 20240270086Abstract: A control method for an electric vehicle equipped with an electric motor as a driving source, the method including: setting a torque target value as a target value related to a driving torque of the electric vehicle based on vehicle information; calculating a basic feedback compensation value based on a parameter indicating a rotation state of the electric motor and a vehicle model of the electric vehicle; calculating a first feedback compensation value by multiplying the basic feedback compensation value by a first gain; calculating a second feedback compensation value by extracting a predetermined specific frequency component from the basic feedback compensation value and multiplying the specific frequency component by a second gain; calculating a torque command value by correcting the torque target value by the first feedback compensation value and the second feedback compensation value; and driving the electric motor based on the torque command value.Type: ApplicationFiled: August 30, 2021Publication date: August 15, 2024Inventors: Akira SAWADA, Takashi NAKAJIMA, Kengo FUJIWARA, Jun MOTOSUGI, Katsunori NAKAMURA
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Publication number: 20240256739Abstract: A method for molding analysis of a plate-like intermediate base material containing resin and reinforcing material when the base material is molded, including applying a base material model having anisotropy between out-of-plane direction and an in-plane direction orthogonal to the out-of-plane direction, and calculating viscosity distribution in a cross-section direction of a molded article using each viscosity in accordance with a flow field, and the viscosity distribution indicates that under a boundary condition there is no slip flow of the base material on a wall surface of the mold, as a result of a shear field in the vicinity of the wall surface, a low viscosity layer that is more affected by an out-of-plane shear viscosity than a central portion of the base material is automatically formed in the vicinity of the wall surface, and the base material in the vicinity of the wall surface functions as a lubricating layer.Type: ApplicationFiled: May 31, 2022Publication date: August 1, 2024Inventors: Daisuke ITAKURA, Kenji FURUICHI, Ryoichi ISHIHARA, Yoshihiro UCHIDA, Tsuyoshi MATSUO, Satoshi SAWADA, Akira HYAKUSAI
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Patent number: 11912136Abstract: A control method of an electric vehicle using one or a plurality of motors as a traveling drive source, includes: a motor torque command value calculating step that calculates a motor torque command value; an angular velocity detecting step that detects an angular velocity correlating with a rotation speed of a drive shaft which transmits a drive force of the motor to a drive wheel; a disturbance torque estimating step that estimates a disturbance torque acting on the motor based on the motor torque command value and the angular velocity; a limiting torque setting step that sets a limiting torque corresponding to the disturbance torque in a manner that a slipping rate of the drive wheel does not exceed a first predetermined value; and a motor torque limiting step that limits the motor torque command value using the limiting torque.Type: GrantFiled: March 6, 2020Date of Patent: February 27, 2024Assignee: NISSAN MOTOR CO., LTD.Inventor: Akira Sawada
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Patent number: 11801757Abstract: A control method for an electric vehicle in which a motor is used as a traveling drive source and deceleration is performed by a regenerative braking force of the motor, the electric vehicle including a towing unit configured to tow a separate object, the method including: acquiring an accelerator operation amount; acquiring a total mass of the electric vehicle; estimating a disturbance torque acting on the electric vehicle; acquiring an angular velocity of a rotary body; estimating a vehicle body speed of the electric vehicle; calculating a torque command value for the motor; measuring a load applied to the towing unit; correcting the total mass of the electric vehicle based on the measured load applied to the towing unit and the torque command value; controlling a torque generated in the motor based on the torque command value; and converging the torque command value to the disturbance torque.Type: GrantFiled: March 27, 2019Date of Patent: October 31, 2023Assignee: NISSAN MOTOR CO., LTD.Inventors: Akira Sawada, Takashi Nakajima, Kengo Fujiwara, Shou Oono, Yui Ito
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Publication number: 20230286392Abstract: A control method of an electric vehicle using one or a plurality of motors as a traveling drive source, includes: a motor torque command value calculating step that calculates a motor torque command value; an angular velocity detecting step that detects an angular velocity correlating with a rotation speed of a drive shaft which transmits a drive force of the motor to a drive wheel; a disturbance torque estimating step that estimates a disturbance torque acting on the motor based on the motor torque command value and the angular velocity; a limiting torque setting step that sets a limiting torque corresponding to the disturbance torque in a manner that a slipping rate of the drive wheel does not exceed a first predetermined value; and a motor torque limiting step that limits the motor torque command value using the limiting torque.Type: ApplicationFiled: March 6, 2020Publication date: September 14, 2023Applicant: NISSAN MOTOR CO., LTD.Inventor: Akira SAWADA
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Publication number: 20230249558Abstract: An electric vehicle control method for controlling a motor based on a torque command value in an electric vehicle includes: a disturbance torque estimation process of calculating a disturbance torque estimation value including an influence of a road surface gradient; a speed parameter acquisition process of acquiring a speed parameter relating to a vehicle speed; and a vehicle state control including a stop process of calculating a stopping basis torque target value so as to converge the torque command value to the disturbance torque estimation value in accordance with a decrease in the speed parameter, and a vibration damping process of calculating a stopping correction torque target value by performing filtering on the stopping basis torque target value.Type: ApplicationFiled: April 14, 2023Publication date: August 10, 2023Applicant: NISSAN MOTOR CO., LTD.Inventors: Hiroyuki KOMATSU, Jun MOTOSUGI, Akira SAWADA, Yui ITO
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Patent number: 11654778Abstract: Provided is an electric vehicle control method. The electric vehicle control method includes: a disturbance torque estimation process of calculating a disturbance torque estimation value including an influence of a road surface gradient; a speed parameter acquisition process of acquiring a speed parameter relating to a vehicle speed; a stop process of calculating a stopping basis torque target value so as to converge a torque command value to the disturbance torque estimation value in accordance with a decrease of a speed parameter; and a vibration damping process of calculating a stopping correction torque target value by performing filterring on the stopping basis torque target value.Type: GrantFiled: March 6, 2020Date of Patent: May 23, 2023Assignee: NISSAN MOTOR CO., LTD.Inventors: Hiroyuki Komatsu, Jun Motosugi, Akira Sawada, Yui Ito
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Publication number: 20220379732Abstract: A control method for an electric vehicle using a motor as a traveling drive source to decelerate by a regenerative braking force of the motor, including: obtaining an accelerator operation amount; estimating a disturbance torque acting on a vehicle body of the electric vehicle; obtaining an angular velocity of a rotating body that correlates to a rotation speed of a drive shaft which drives the electric vehicle; calculating a first torque command value based on the accelerator operation amount; setting the first torque command value to a torque command value; controlling a torque generated in the motor based on the torque command value; setting a target stop position at the time of stopping the electric vehicle; calculating a target angular velocity of the rotating body according to a distance from the electric vehicle to the target stop position; calculating a second torque command value for stopping the electric vehicle at the target stop position based on a difference between the target angular velocity anType: ApplicationFiled: October 28, 2019Publication date: December 1, 2022Applicant: NISSAN MOTOR CO., LTD.Inventors: Katsunori NAKAMURA, Akira SAWADA, Takashi NAKAJIMA, Kengo FUJIWARA
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Publication number: 20220258617Abstract: Provided is an electric vehicle control method. The electric vehicle control method includes: a disturbance torque estimation process of calculating a disturbance torque estimation value including an influence of a road surface gradient; a speed parameter acquisition process of acquiring a speed parameter relating to a vehicle speed; a stop process of calculating a stopping basis torque target value so as to converge a torque command value to the disturbance torque estimation value in accordance with a decrease of a speed parameter; and a vibration damping process of calculating a stopping correction torque target value by performing filterring on the stopping basis torque target value.Type: ApplicationFiled: March 6, 2020Publication date: August 18, 2022Applicant: NISSAN MOTOR CO., LTD.Inventors: Hiroyuki KOMATSU, Jun MOTOSUGI, Akira SAWADA, Yui ITO
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Publication number: 20220185121Abstract: A control method for an electric vehicle according to the present embodiment is a control method for an electric vehicle in which an electric motor 4 is used as a traveling drive source and deceleration is performed by a regenerative braking force of the electric motor 4.Type: ApplicationFiled: March 27, 2019Publication date: June 16, 2022Applicant: NISSAN MOTOR CO., LTD.Inventors: Akira SAWADA, Takashi NAKAJIMA, Kengo FUJIWARA, Shou OONO, YUI ITO
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Patent number: 11050952Abstract: A reading circuit for an infrared detector, includes: pixel driving circuits arranged in a matrix; vertical selection lines provided for respective rows of the pixel driving circuits; horizontal selection lines provided for respective columns of the pixel driving circuits; a vertical selection circuit configured to output a row selection signal to the vertical selection lines; and a horizontal selection circuit configured to output a column selection signal to the horizontal selection lines to read, to a reading line, a signal from pixel driving circuits for one row selected by the row selection signal, wherein each pixel driving circuit includes a driving circuit of the infrared detector, and a switching circuit configured to switch whether or not to input a test signal to the driving circuit, based on the row selection signal output to a corresponding vertical selection line and the column selection signal output to a corresponding horizontal selection line.Type: GrantFiled: October 11, 2019Date of Patent: June 29, 2021Assignee: FUJITSU LIMITEDInventor: Akira Sawada
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Patent number: 10994619Abstract: A control method for an electric vehicle includes controlling a torque of a motor based on a final torque command value by calculating the final torque command value such that a vibration damping control to reduce vibrations of a driving force transmission system of a vehicle is performed on a target torque command value set based on vehicle information, calculating the final torque command value based on the target torque command value and a value obtained by multiplying a drive-shaft torsional angular velocity by a feedback gain, estimating, by use of a vehicle model that models the driving force transmission system, a dead-zone period during which a motor torque output from the motor is not transmitted to a drive-shaft torque of the vehicle, and determining whether or not the vehicle is just before stop of the vehicle.Type: GrantFiled: December 14, 2016Date of Patent: May 4, 2021Assignee: Nissan Motor Co., Ltd.Inventors: Akira Sawada, Kengo Fujiwara, Shou Oono
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Patent number: 10972020Abstract: The control method for an electric vehicle sets a motor torque command value based on vehicle information and controls torque of a first motor connected to a first drive wheel which is one of a front drive wheel and a rear drive wheel. The control method for an electric vehicle calculates a first torque command value by a feedforward computation based on the motor torque command value, detects a rotation angular velocity of the first motor, and estimates a rotation angular velocity of the first motor based on the first torque command value by using a vehicle model Gp(s) that simulates a transfer characteristic from a torque input to the first drive wheel to a rotation angular velocity of the first motor.Type: GrantFiled: June 1, 2017Date of Patent: April 6, 2021Assignee: Nissan Motor Co., Ltd.Inventors: Akira Sawada, Ken Itou, Kengo Fujiwara
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Publication number: 20200259431Abstract: The control method for an electric vehicle sets a motor torque command value based on vehicle information and controls torque of a first motor connected to a first drive wheel which is one of a front drive wheel and a rear drive wheel. The control method for an electric vehicle calculates a first torque command value by a feedforward computation based on the motor torque command value, detects a rotation angular velocity of the first motor, and estimates a rotation angular velocity of the first motor based on the first torque command value by using a vehicle model Gp(s) that simulates a transfer characteristic from a torque input to the first drive wheel to a rotation angular velocity of the first motor.Type: ApplicationFiled: June 1, 2017Publication date: August 13, 2020Applicant: Nissan Motor Co., Ltd.Inventors: Akira Sawada, Ken Itou, Kengo Fujiwara
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Patent number: 10710463Abstract: The control device for the electric vehicle determines whether or not the starting operation of the vehicle has been performed by the driver, calculates the disturbance torque estimated value Td necessary for maintaining the vehicle stop state corresponding to the disturbance acting on the vehicle, and performs a control such that the driving torque of the motor converges to the disturbance torque estimated value Td when the vehicle is determined to be just before stop of the vehicle during running or determined to have undergone the starting operation. Then, the control device for the electric vehicle controls the responsiveness of the driving torque to the disturbance acting on the vehicle, and increases the responsiveness of the driving torque of the motor compared with the responsiveness of the driving torque just before stop of the vehicle when the starting operation is determined to have been performed.Type: GrantFiled: May 26, 2015Date of Patent: July 14, 2020Assignee: NISSAN MOTOR CO., LTD.Inventors: Akira Sawada, Ken Itou, Takashi Nakajima, Yuji Katsumata, Hiroyuki Komatsu
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Patent number: 10696177Abstract: A vehicle control device for decelerating by the regenerative braking of a motor connected to a drive shaft of a drive wheel calculates a torque command value for suppressing a vibration component of the drive shaft by feeding back a torsional angular velocity of the drive shaft to a desired torque that determines the power of the motor and controls the operation of the motor on the basis of the torque command value. The control device estimates a dead zone section, in which the torque of the motor in the vehicle is not transmitted to the drive shaft, on the basis of the desired torque and limits the torque command value in the case where the vehicle is in the dead zone section.Type: GrantFiled: July 29, 2016Date of Patent: June 30, 2020Assignee: NISSAN MOTOR CO., LTD.Inventors: Kengo Fujiwara, Akira Sawada, Sho Ohno
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Publication number: 20200137323Abstract: A reading circuit for an infrared detector, includes: pixel driving circuits arranged in a matrix; vertical selection lines provided for respective rows of the pixel driving circuits; horizontal selection lines provided for respective columns of the pixel driving circuits; a vertical selection circuit configured to output a row selection signal to the vertical selection lines; and a horizontal selection circuit configured to output a column selection signal to the horizontal selection lines to read, to a reading line, a signal from pixel driving circuits for one row selected by the row selection signal, wherein each pixel driving circuit includes a driving circuit of the infrared detector, and a switching circuit configured to switch whether or not to input a test signal to the driving circuit, based on the row selection signal output to a corresponding vertical selection line and the column selection signal output to a corresponding horizontal selection line.Type: ApplicationFiled: October 11, 2019Publication date: April 30, 2020Applicant: FUJITSU LIMITEDInventor: Akira Sawada
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Publication number: 20190337398Abstract: A vehicle control device for decelerating by the regenerative braking of a motor connected to a drive shaft of a drive wheel calculates a torque command value for suppressing a vibration component of the drive shaft by feeding back a torsional angular velocity of the drive shaft to a desired torque that determines the power of the motor and controls the operation of the motor on the basis of the torque command value. The control device estimates a dead zone section, in which the torque of the motor in the vehicle is not transmitted to the drive shaft, on the basis of the desired torque and limits the torque command value in the case where the vehicle is in the dead zone section.Type: ApplicationFiled: July 29, 2016Publication date: November 7, 2019Applicant: NISSAN MOTOR CO., LTD.Inventors: Kengo FUJIWARA, Akira SAWADA, Sho OHNO