Patents by Inventor Shohei IMAJI
Shohei IMAJI 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: 11326691Abstract: A belt-type continuously variable transmission includes a primary pulley, a secondary pulley, and a belt wound around the primary pulley and the secondary pulley. A controller performs a process, when performing a low speed position return shift to shift a transmission ratio toward a lowermost speed position while a vehicle is decelerating. The process includes: calculating a primary pressure actual lower limit, at which the belt actually starts to slip, based on the transmission ratio and a deceleration of the vehicle; setting a lower limit of a setpoint of the primary pressure to the primary pressure actual lower limit; setting the primary pressure actual lower limit higher with a locking tendency of a vehicle wheel detected than that without the locking tendency detected; and setting the primary pressure actual lower limit with the locking tendency detected to increase as the transmission ratio varies toward the lowermost speed position.Type: GrantFiled: August 6, 2019Date of Patent: May 10, 2022Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.Inventors: Hiromichi Akebono, Shohei Imaji, Seiichirou Takahashi, Katsuyuki Hara
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Patent number: 11149845Abstract: A continuously variable transmission (2) has a torque convertor (3) having a lock-up clutch (30) and a continuously variable transmission mechanism (5). A control unit (10) has a shift control unit (10C) configured to be able to perform a pseudo stepwise up-shift control that varies a transmission ratio of the continuously variable transmission mechanism (5) stepwise, a lock-up control unit (10A) configured to control an engagement state of the lock-up clutch (30), and a torque control command unit (10D) configured to perform a torque-down control of a driving source (1). When the engagement control of the lock-up clutch (30) and the pseudo stepwise up-shift control are performed at the same time, the torque control command unit (10D) configured to perform the torque-down control with a greater torque reduction amount.Type: GrantFiled: December 13, 2018Date of Patent: October 19, 2021Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.Inventors: Yasuhiro Endo, Akihiro Tanabe, Takahiro Yamada, Shohei Imaji, Masayuki Mannen
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Publication number: 20210254711Abstract: A belt-type continuously variable transmission includes a primary pulley, a secondary pulley, and a belt wound around the primary pulley and the secondary pulley. A controller performs a process, when performing a low speed position return shift to shift a transmission ratio toward a lowermost speed position while a vehicle is decelerating. The process includes: calculating a primary pressure actual lower limit, at which the belt actually starts to slip, based on the transmission ratio and a deceleration of the vehicle; setting a lower limit of a setpoint of the primary pressure to the primary pressure actual lower limit; setting the primary pressure actual lower limit higher with a locking tendency of a vehicle wheel detected than that without the locking tendency detected; and setting the primary pressure actual lower limit with the locking tendency detected to increase as the transmission ratio varies toward the lowermost speed position.Type: ApplicationFiled: August 6, 2019Publication date: August 19, 2021Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Hiromichi AKEBONO, Shohei IMAJI, Seiichirou TAKAHASHI, Katsuyuki HARA
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Publication number: 20210062914Abstract: A continuously variable transmission (2) has a torque convertor (3) having a lock-up clutch (30) and a continuously variable transmission mechanism (5). A control unit (10) has a shift control unit (10C) configured to be able to perform a pseudo stepwise up-shift control that varies a transmission ratio of the continuously variable transmission mechanism (5) stepwise, a lock-up control unit (10A) configured to control an engagement state of the lock-up clutch (30), and a torque control command unit (10D) configured to perform a torque-down control of a driving source (1). When the engagement control of the lock-up clutch (30) and the pseudo stepwise up-shift control are performed at the same time, the torque control command unit (10D) configured to perform the torque-down control with a greater torque reduction mount.Type: ApplicationFiled: December 13, 2018Publication date: March 4, 2021Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Yasuhiro ENDO, Akihiro TANABE, Takahiro YAMADA, Shohei IMAJI, Masayuki MANNEN
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Patent number: 8818654Abstract: Engine output control apparatus has shift range detecting section detecting shift range of automatic transmission; vehicle speed detecting section detecting vehicle speed; engine output state detecting section detecting engine output state; and controller. The controller performs (a) judgment control judging that torque converter is in a stall state if following judgment conditions (i) to (iii) are satisfied, (i) shift range is drive range, (ii) vehicle speed is equal to or less than predetermined vehicle speed, (iii) engine is in a high output state, (b) cumulation control cumulating a period of agreement of the judgment conditions if the judgment conditions are satisfied, and (c) output suppression control suppressing output of the engine if a control start condition is satisfied by cumulation of the agreement period. The control start condition is set so that as the vehicle speed becomes higher, start of the output suppression control is more delayed.Type: GrantFiled: March 5, 2013Date of Patent: August 26, 2014Assignee: JATCO LtdInventors: Takashi Koguchi, Kazunori Sugiura, Shin Tsukamoto, Shohei Imaji, Yoshiyuki Egawa
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Publication number: 20130261906Abstract: Engine output control apparatus has shift range detecting section detecting shift range of automatic transmission; vehicle speed detecting section detecting vehicle speed; engine output state detecting section detecting engine output state; and controller. The controller performs (a) judgment control judging that torque converter is in a stall state if following judgment conditions (i) to (iii) are satisfied, (i) shift range is drive range, (ii) vehicle speed is equal to or less than predetermined vehicle speed, (iii) engine is in a high output state, (b) cumulation control cumulating a period of agreement of the judgment conditions if the judgment conditions are satisfied, and (c) output suppression control suppressing output of the engine if a control start condition is satisfied by cumulation of the agreement period. The control start condition is set so that as the vehicle speed becomes higher, start of the output suppression control is more delayed.Type: ApplicationFiled: March 5, 2013Publication date: October 3, 2013Applicant: JATCO LTDInventors: Takashi KOGUCHI, Kazunori SUGIURA, Shin TSUKAMOTO, Shohei IMAJI, Yoshiyuki EGAWA