Patents Assigned to JATCO
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Patent number: 10086817Abstract: A control device for a vehicle is provided. The control device includes an automatic transmission constituted of a stepwise variable transmission mechanism configured to switch a plurality of shift stages by engagement and disengagement of a plurality of friction engaging elements, an engine as a driving source, a motor configured to assist a driving force of the engine, a hydraulic controller configured to supply a hydraulic pressure to control the engagement and the disengagement of the friction engaging element, and a control unit configured to control the automatic transmission to a target speed ratio through changing the shift stage of the stepwise variable transmission mechanism. The control unit performs a learning control that learns at least one of hydraulic pressure of the engagement and the disengagement of the friction engaging element, and inhibits the assist of the driving force to the engine by the motor in performing the learning control.Type: GrantFiled: March 12, 2015Date of Patent: October 2, 2018Assignee: JATCO LTDInventors: Yoshinobu Kawamoto, Mamiko Inoue
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Publication number: 20180264973Abstract: In a specific state where an electric vehicle is in a stop state and a creep torque is generate in an electric motor (2), when a shift range is switched from a traveling range to a non-traveling range, a motor control section (10B) performs a torque decrease control to stepwisely decrease the creep torque of the electric motor (2), and an automatic transmission control device (30) performs a disengagement control to gradually disengage the frictional engagement element of the automatic transmission (3).Type: ApplicationFiled: November 15, 2016Publication date: September 20, 2018Applicant: JATCO LtdInventors: Tomoo MOCHIZUKI, Kenichi OOSHIMA, Hiroshi MIYAZAKI, Yuji TORIZAWA, Hiroki MATSUI, Daisuke NAKAGAWA, Takefumi SUZUKI
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Publication number: 20180259065Abstract: In an automatic transmission control device of the invention configured to start an increase in engagement pressure of a start-up engagement element, when a determination threshold value for determining that a turbine rotational speed has reduced is reached or exceeded, the determination threshold value when a selection operation from a non-traveling range to a traveling range is made before a prescribed period of time from starting of an engine has elapsed, is increased and set greater than the determination threshold value when the selection operation is made after the prescribed period of time has elapsed. Accordingly, a reduction in the turbine rotational speed can be accurately determined, and thus it is possible to suppress torque fluctuations, occurring owing to engagement of a second brake, which is the start-up engagement element.Type: ApplicationFiled: October 21, 2016Publication date: September 13, 2018Applicant: JATCO LtdInventors: Ryosuke FUJII, Hiroaki SHIOKAWA
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Patent number: 10071737Abstract: There is provided with an automatic transmission (2) having a clutch (32) and a brake device (6) which holds a brake force during a stop of an engine (1). There is provided with an engine control section (11) which performs an automatic stop of the engine and a re-start of the engine and a release control section (14) which releases a holding of the brake force during the re-start of the engine. The release control section (14) releases the holding of the brake force when an engagement state of the clutch (32) is a predetermined state in case where an accelerator off state occurs until the engagement state of the clutch (32) becomes the predetermined state and releases the holding of the brake force when the engagement state of the clutch (32) is an engagement state weaker than the predetermined state, during a re-start of the engine (1).Type: GrantFiled: January 29, 2015Date of Patent: September 11, 2018Assignee: JATCO LtdInventors: Noritaka Aoyama, Azusa Shimoda, Yuki Ono, Tomoaki Kabe
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Publication number: 20180251018Abstract: A powertrain includes; a first shaft connected to a first power source; a second shaft including first and second parts connected with a second power source and an output element respectively; first and second drive gears supported so as to be able to rotate relative to the first shaft; first and second driven gears supported on and fixed to the second shaft and respectively meshing with the first and second drive gears constantly; a first clutch capable of engaging the first drive gear with the first shaft; a second clutch capable of engaging the second drive gear with the first shaft; and a third clutch capable of connecting and disconnecting the first part to and from the second part between the first and second driven gears. Consequently, a powertrain with driving paths from multiple power sources in multiple stages can be achieved while avoiding the use of a three-shaft structure.Type: ApplicationFiled: August 29, 2016Publication date: September 6, 2018Applicant: JATCO LtdInventors: Yoshihiro KURAHASHI, Kouhei TOYOHARA
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Publication number: 20180244256Abstract: A controller is a control device for a vehicle including an engine, an automatic transmission, and an oil pump and executes a sailing stop control that stops the engine and brings the automatic transmission into a neutral state when a sailing stop condition is satisfied. The controller cancels the sailing stop control to start the engine when a road inclination becomes larger than a predetermined value during the sailing stop control.Type: ApplicationFiled: September 27, 2016Publication date: August 30, 2018Applicant: JATCO LtdInventors: Yusuke OOTA, Yoshimasa NISHIHIRO, Masayoshi NAKASAKI, Naoki KOBAYASHI
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Publication number: 20180245689Abstract: In a vehicle equipped with a torque converter (4) having a lock-up clutch (3), learning control for obtaining a learning value (L_n) on the basis of meet-point information, with which the lock-up clutch (3) initiates torque transmission, is carried out. After acquiring the current learning detection value (M_n), a meet-point learning control unit (12c) calculates the current detection error (E_n) on the basis of the difference between the current learning detection value (M_n) and the previous learning value (L_(n?1)) that is stored. When the current and previous detection errors (E_n) and (E_n?1) have the same plus/minus sign, the current learning value correction amount is set to a larger value if the absolute value |(E_n?1)| of the previous detection error (E_n?1) is large than if the absolute value |(E_n?1)| is small. The sum of the previous learning value (L_(n?1)) and the current learning value correction amount is set as the present learning value (L_n).Type: ApplicationFiled: August 31, 2016Publication date: August 30, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Toshimitsu ARAKI, Seiji KASAHARA, Hideshi WAKAYAMA, Hiroyasu TANAKA
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Publication number: 20180245691Abstract: A control device for a continuously variable transmission mechanism of a vehicle includes: a stepwise variable transmission mechanism which is disposed in series with the continuously variable transmission mechanism, and which has at least two or more forward gear stages; and a controller configured to increase the belt capacities to be greater than the belt capacity set when an accelerator opening degree is zero, at least in a time period from a timing when the accelerator opening degree becomes zero, to a timing when a braking force is generated by a depression of a brake pedal, the controller being configured to set an increase amount with respect to the belt capacity set when the accelerator opening degree is zero, to a smaller value as a transmission gear ratio of the stepwise variable transmission mechanism is higher.Type: ApplicationFiled: September 6, 2016Publication date: August 30, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Yoshinobu KAWAMOTO, Norio ASAI, Hiroyasu TANAKA
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Publication number: 20180244273Abstract: Variator (20) and forward clutch (Fwd/C) disposed in series are provided between engine (1) having starter motor (15) and driving wheel (7). Sailing stop control that, on the basis of satisfaction of sailing entering condition, interrupts power transmission by frictional engagement element (Fwd/C), stops engine (1) and performs coast-travel is performed. When sailing entering condition is satisfied, coast-travel is started with rotation stop timing of variator (20) being delayed with respect to rotation stop timing of engine (1). When accelerator pedal depression operation intervenes after start of coast-travel, engine (1) is restarted by starter motor (15). When judged that input and output rotation speeds of frictional engagement element (Fwd/C) become synchronization rotation speed after restart of engine (1), frictional engagement element (Fwd/C) is reengaged.Type: ApplicationFiled: October 17, 2016Publication date: August 30, 2018Applicant: JATCO LtdInventors: Tadashi IWAMOTO, Akira TAKANO, Masayoshi NAKASAKI, Yoshimasa NISHIHIRO, Yukifumi OOTSUKA
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Publication number: 20180244284Abstract: An automatic transmission includes an oil temperature detecting unit configured to detect an oil temperature of the hydraulic oil, and a controller configured to perform the control of the speed ratio on a basis of the oil temperature obtained from the oil temperature detecting unit. The controller is configured such that if the controller has failed to obtain the oil temperature from the oil temperature detecting unit, the controller outputs a command to restrict an output from the driving force source, and such that if the controller has obtained the oil temperature from the oil temperature detecting unit again, the controller gradually cancels the command to restrict the output from the driving force source.Type: ApplicationFiled: August 26, 2016Publication date: August 30, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Norihira AMANO, Youji ITOU, Kosuke ABE
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Publication number: 20180245686Abstract: In a transmission control device for controlling a transmission, a controller determines failure of a SOL corresponding to a hydraulic secondary-pressure actuator. The controller variably controls line command pressure, and in a case where the failure is determined, fixes the line command pressure to a line pressure set value. The controller variably controls primary command pressure, and in a case where the failure is determined, continuously changes a speed ratio of a variator by variably controlling the primary command pressure. The controller variably controls secondary command pressure, and in a case where the failure is determined, fixes the secondary command pressure to a secondary pressure set value.Type: ApplicationFiled: February 17, 2016Publication date: August 30, 2018Applicants: JATCO Ltd, Nissan Motor Co., Ltd.Inventors: Masahiro HAMANO, Youji ITOU, Kosuke ABE, Haruka OZONO
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Publication number: 20180245688Abstract: In a vehicle on which a torque converter having a lock-up clutch is mounted between an engine and a transmission, a meet point learning controller is provided to perform learning control for obtaining a learning value based on information on a meet point at which the lock-up clutch starts torque transmission. The meet point learning controller estimates a LU transmission torque based on a difference between an engine torque signal value and a torque converter transmission torque when the lock-up clutch moves from a non-engaged state to an engaged state during traveling of the vehicle, and uses, as the meet point information, a meet point detection pressure at a time when the LU transmission torque estimated value is determined to have entered an upward trend.Type: ApplicationFiled: August 12, 2016Publication date: August 30, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Toshimitsu ARAKI, Seiji KASAHARA, Hideshi WAKAYAMA, Kouji SAITOU, Hiroyasu TANAKA
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Patent number: 10060514Abstract: A continuously variable chain-belt transmission (chain-belt CVT) housed in a transmission casing formed by a transmission case and a side cover, has a pair of conical disk pairs, each pair of which is rotatably supported by disk supporting portions provided in the transmission case and the side cover; a chain wound around the pair of conical disk pairs; a chain guide attached to the chain to restrain movement of the chain and having an annular guide portion that encloses an entire circumference, in cross section, of the chain; and a chain guide supporting portion supporting the chain guide between the transmission case and the side cover. The chain guide supporting portion has a fixing side chain guide supporting portion fixed to the transmission case and a connecting side chain guide supporting portion connecting to the fixing side chain guide supporting portion.Type: GrantFiled: February 9, 2011Date of Patent: August 28, 2018Assignees: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Takayuki Nakamura, Hidekazu Yagi, Kazutaka Imai
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Patent number: 10054202Abstract: A torque cam device includes: a drive cam member; a driven cam member; and an intermediate cam member which includes a second drive cam surface that is formed on one end, and that is arranged to be abutted on the first drive cam surface, a second driven cam surface that is formed on the other end, and that is arranged to be abutted on the first driven cam surface, and which is arranged to be rotated relative to the driven cam member and the driven cam member, the first and second drive cam surfaces being abutted on each other when a power is transmitted from the drive cam member to the driven cam member, the first and second driven cam surfaces being abutted on each other when the power is transmitted from the driven cam member to the drive cam member.Type: GrantFiled: September 4, 2014Date of Patent: August 21, 2018Assignee: JATCO LtdInventor: Kazuhiko Yokoyama
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Patent number: 10053083Abstract: A control apparatus for a hybrid vehicle includes a low temperature time hydraulic control section (11a) to perform a low temperature time hydraulic control to restrain a discharge quantity of operating oil from an oil pump (4) by limiting a line pressure of a transmission (7) at an engine cold time to a predetermined value smaller than a maximum value of a line pressure command pressure for a predetermined time period. The hydraulic control by this low temperature time hydraulic control section (11a) is continued until the motor is started after the start of the engine and a first clutch (3) is engaged at the time of low temperature of engine (1). By so doing, the control apparatus can prevent the oil pump from being stopped by inappropriate starting timing of the low temperature time hydraulic control.Type: GrantFiled: September 4, 2014Date of Patent: August 21, 2018Assignees: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventor: Hironori Miyaishi
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Patent number: 10047853Abstract: Oil pressure controller for an automatic transmission produces a pre-charge shelf pressure supplied to a starter clutch by rapidly decreasing a command hydraulic pressure to the starter clutch after temporarily rapidly increasing the command hydraulic pressure, also produces a capacity adjustment pressure (Pb1 or Pb2) of the starter clutch by gradually increasing the hydraulic pressure from a decrease point of the pre-charge shelf pressure (Pa), when a selecting operation is made from N-range to D-range. By changing capacity adjustment pressure (Pb1 or Pb2) according to brake-operating/nonoperating state, capacity adjustment pressure (Pb1) in the brake-nonoperating state is set to be higher than capacity adjustment pressure (Pb2) in the brake-operating state by an offset hydraulic pressure amount. With this, when the selecting operation is made from N-range to D-range, in the brake-operating state, selection shock of the starter clutch can be reduced.Type: GrantFiled: August 27, 2014Date of Patent: August 14, 2018Assignee: JATCO LtdInventors: Kouichi Kotsuji, Kenji Hattori
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Publication number: 20180216729Abstract: In a vehicle equipped with a torque converter 4 having a lock-up clutch (3), learning control for obtaining a learning value (L_n) on the basis of meet-point information, with which the lock-up clutch (3) initiates torque transmission, is carried out. When the lock-up clutch (3) experiences a transition to an engaged state during travel, a meet-point learning control unit (12c) calculates an LU transmission torque estimate on the basis of the difference between the engine torque (engine torque signal value Te) and the torque converter transmission torque (?·Ne2). Excess clutch capacity is detected when the LU transmission torque estimate is greater than an excess capacity determination transmission torque threshold within a prescribed amount of time after an initial pressure (P_n) based on the learning value (L_n) is instructed. When excess clutch capacity is detected, a learning value correction that reduces the learning value (L_n) is carried out.Type: ApplicationFiled: August 31, 2016Publication date: August 2, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Toshimitsu ARAKI, Hideshi WAKAYAMA, Kouji SAITOU, Seiji KASAHARA, Tetsuya IZUMI
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Patent number: 10024428Abstract: A hydraulic control device includes an oil pump for generating a hydraulic pressure by being rotated by power of a driving force source, a driving force source stopping unit that stops rotation of the driving force source when a predetermined condition holds, and a cut-off unit that cuts off transmission of the power from the driving force source to the oil pump when the driving force source rotates in a reverse direction as the rotation of the driving force source is stopped by the driving force source stopping unit.Type: GrantFiled: August 25, 2011Date of Patent: July 17, 2018Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.Inventors: Naohiro Yamada, Keichi Tatewaki, Shinichiro Watanabe, Noritaka Aoyama
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Publication number: 20180180178Abstract: In a transmission, a controller sets a target line pressure to an offset target value, which is a value obtained by adding a positive offset amount to one of a target PRI pressure and a target SEC pressure, in a speed ratio range in which the offset target value is higher than the other at least during an inertia phase in a sub-transmission mechanism when a coordinated shift is carried out. At that time, the one of the target PRI pressure and the target SEC pressure is the target SEC pressure when a variator is downshifted by the coordinated shift while being the target PRI pressure when the variator is upshifted by the coordinated shift.Type: ApplicationFiled: June 13, 2016Publication date: June 28, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Mamiko INOUE, Tomonari UCHIYAMA, Hideshi WAKAYAMA
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Publication number: 20180180179Abstract: A hydraulic pressure control device for a continuously variable transmission of a vehicle which a continuously variable transmission mechanism; a stepwise variable transmission mechanism; a shift control means, the hydraulic pressure control device includes: the shift control means including a line pressure control section configured to increase the line pressure to be greater than the line pressure before a generation of an oil vibration when the oil vibration is generated in at least one of actual hydraulic pressures of the primary pressure and the secondary pressure, and the line pressure control section being configured to continue the increase of the line pressure until the shift of the stepwise variable transmission mechanism is finished when the stepwise variable transmission is shifted in a state where the line pressure is increased.Type: ApplicationFiled: September 6, 2016Publication date: June 28, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Yoshinobu KAWAMOTO, Hiroyasu TANAKA