Patents Assigned to JATCO
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Publication number: 20180180175Abstract: A transmission includes a sub-transmission mechanism, a variator having lower shift responsiveness than the sub-transmission mechanism, and a controller configured to carry out a coordinated shift for changing a speed ratio of the variator in a direction opposite to a changing direction of a speed ratio of the sub-transmission mechanism as the sub-transmission mechanism is shifted so that a through speed ratio reaches a target through speed ratio. The controller sets a target speed ratio of the sub-transmission mechanism on the basis of the target through speed ratio and an actual speed ratio of the variator in carrying out the coordinated shift.Type: ApplicationFiled: June 13, 2016Publication date: June 28, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Mamiko INOUE, Hideshi WAKAYAMA
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Patent number: 10005445Abstract: A vehicle control device including an electronically controlled throttle device and configured to control a vehicle for supplying a hydraulic pressure to a friction engaging element of a transmission on the basis of a throttle valve opening controls a start timing of a supply of the hydraulic pressure to the friction engaging element on the basis of an accelerator pedal opening and the throttle valve opening if a shift lever is changed from an advance position to a reverse position or from the reverse position to the advance position.Type: GrantFiled: February 16, 2015Date of Patent: June 26, 2018Assignee: JATCO LtdInventors: Kohshi Tamai, Takao Arimatsu
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Patent number: 10006542Abstract: A control device for a continuously variable transmission includes a wheel speed difference sensing section configured to sense a wheel speed difference between the driving wheel and the driven wheel from a detection value of the first rotation speed sensor and a detection value of the second rotation speed sensor; and a clamping force increasing section configured to increase a clamping force for sandwiching a belt of the continuously variable transmission by a pulley when the wheel speed difference becomes equal to or greater than a first predetermined value, relative to a case where the wheel speed difference is smaller than the first predetermined value.Type: GrantFiled: June 24, 2015Date of Patent: June 26, 2018Assignees: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Kosuke Abe, Tomoyuki Suwabe, Shin Tsukamoto
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Publication number: 20180172149Abstract: The present invention relates to a control device and a control method for a vehicle in which a lockup clutch is disengaged when a rotation speed of an engine falls below a disengagement rotation speed. The device/method changes a speed ratio of a variator on the basis of a shifting map in which a primary pulley rotation speed on a coast line is set higher than a primary pulley rotation speed on a drive line and sets a target input rotation speed of the variator to a predetermined target input rotation speed higher than the primary pulley rotation speed on the drive line when an operation of an accelerator pedal is performed such that an accelerator pedal opening falls to a first predetermined opening or less. As a result, the present invention can suppress drop of fuel efficiency of the engine caused by disengagement of the lockup clutch which is a friction engagement element.Type: ApplicationFiled: May 18, 2016Publication date: June 21, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Masayuki MIYAZONO, Hideshi WAKAYAMA, Kyounggon CHOI
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Patent number: 10001213Abstract: A transmission including a variator capable of continuously changing a speed ratio, a stepped transmission mechanism arranged in series with the variator and in which a gear position is switched and a shilling control unit executing stepped shifting repeatedly performing a shifting suppression phase and an upshift phase when a stepped upshift shifting condition is satisfied is provided, and the shifting control unit completes a change from an n-th gear position of the stepped transmission mechanism to an n+1 gear position if the stepped transmission mechanism is at the n-th gear position before the through speed ratio reaches a Highest speed ratio of the variator when the stepped shifting is performed.Type: GrantFiled: May 20, 2014Date of Patent: June 19, 2018Assignee: JATCO LtdInventors: Masashi Sato, Hideshi Wakayama, Mamiko Inoue, Kousuke Waku, Hyuk Park
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Patent number: 9995389Abstract: A continuously variable transmission (100), wherein pressure equalization control is performed to make line pressure (PL) equal to secondary pressure (Psec) when prescribed start conditions are satisfied. During pressure equalization control, a secondary pressure indicated value (Psec_co) is raised by a prescribed amount (S10), then a line pressure indicated value (PL_co) is gradually decreased (S30). If determination is made that line pressure is the same as the secondary pressure after secondary actual pressure (Psec) is lowered (S40), then the line pressure is controlled so that the secondary actual pressure (Psec) becomes the secondary pressure indicated value (Psec_co) (S50). At the start of pressure equalization control, if the difference (?Psec) found by subtracting the secondary pressure indicated value from the secondary actual value is negative (S120), then a primary pressure indicated value is corrected on the basis of the difference (S130).Type: GrantFiled: October 23, 2015Date of Patent: June 12, 2018Assignees: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Seiichiro Takahashi, Tomoaki Honma, Yuta Suzuki, Itaru Shinohara
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Publication number: 20180156669Abstract: A mounting structure of a temperature sensor is adapted to mount a temperature sensor adapted to measure a temperature of a coil to a stator constituted by arranging a plurality of sets of a stator core, the coil wound around the stator core, and an insulator ensuring insulation between the stator core and the coil. The mounting structure of a temperature sensor comprises a holder fixing portion fixed to the insulator, and a sensor holding portion formed integrally with the holder fixing portion and holding the temperature sensor on a coil end portion of the coil. In the sensor holding portion, a storage groove adapted to store the temperature sensor is formed, and at a groove bottom of the storage groove, a sensor pressing portion adapted to press the temperature sensor to the coil end portion is formed.Type: ApplicationFiled: May 18, 2016Publication date: June 7, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Akihiro KOYAMA, Masaomi MORISHITA, Yasushi ARAKAWA
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Patent number: 9989150Abstract: A belt-type continuously variable transmission is equipped with a belt wrapped around across a primary pulley and a secondary pulley, and a CVT control unit for controlling pulley hydraulic pressures to the primary pulley and the secondary pulley. The CVT control unit determines whether an operating state is a driving state where the direction of an input torque inputted to the belt-type continuously variable transmission is from a driving source or a coasting state where the input torque direction is from drive road wheels. The pulley hydraulic pressure for the input torque for when it is determined that the operating state is the coasting state is set higher than the pulley hydraulic pressure for the input torque for when it is determined that the operating state is the driving state, thereby suppressing a slippage of the belt.Type: GrantFiled: February 3, 2014Date of Patent: June 5, 2018Assignees: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Manabu Yamanaka, Hironori Miyaishi
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Patent number: 9970516Abstract: A vehicle continuously transmission mechanism includes a seal mechanism to seal a hydraulic chamber defined by fixed and movable members on a back surface side of a movable sheave of a pulley or seal an oil passage communicating with the hydraulic chamber. This seal mechanism has an annular seal member normally brought into intimate contact with an opposing surface of the sliding contact part and a lip seal member formed with an annular lip such that a tip end of the annular lip is directed toward the outside and a side surface of the annular lip located closer to the hydraulic chamber or oil passage is brought into elastic contact with the opposing surface of the sliding contact part.Type: GrantFiled: March 13, 2015Date of Patent: May 15, 2018Assignee: JATCO LtdInventors: Yoichi Tsuji, Takayuki Suzuki, Hirofumi Koshiji, Kouichi Katou, Katsuyuki Umezawa
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Patent number: 9964207Abstract: A transmission controller increases hydraulic pressure supplied to a secondary pulley and decreases hydraulic pressure supplied to a primary pulley to shift a variator to a mechanical Low speed ratio during the hydraulic pressure supplied to the primary pulley and the secondary pulley vibrates. The mechanical Low speed ratio is a speed ratio where a groove width of the primary pulley has a maximum value possible to be employed in structure of the primary pulley.Type: GrantFiled: June 3, 2015Date of Patent: May 8, 2018Assignees: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Kunihiro Takahashi, Tetsuya Izumi, Masayuki Miyazono, Takuichiro Inoue, Masashi Suwabe, Makoto Komatsu, Yuji Okamoto
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Publication number: 20180119813Abstract: CVT controller has rotation speed sensors detecting driving and driven wheel rotation speed; driving and driven wheel speed difference detection unit detecting wheel speed difference ?vfr; and bad road judgment unit judging that road is bad road when ?vfr is first value ?vfr_br or greater. CVT controller further has first belt clamping force increase unit increasing belt clamping force in case where road is judged to be bad road, as compared with case where road is not judged to be bad road; vibration detection unit detecting vehicle speed vibration fvsp; and second belt clamping force increase unit increasing belt clamping force when ?vfr is second value ?vfr_psec or greater or when fvsp is third value fvsp_psec or greater in case where road is not judged to be bad road, as compared with case where ?vfr is less than ?vfr_psec and case where fvsp is less than fvsp_psec.Type: ApplicationFiled: February 3, 2016Publication date: May 3, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Kosuke ABE, Shin TSUKAMOTO, Seiichiro TAKAHASHI, Hiroyasu TANAKA
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Publication number: 20180119800Abstract: An oil pressure control device has a mechanical oil pump (O/P) driven by a motor/generator (MG), an electric oil pump (M/O/P) driven by a sub motor (S/M) and a line pressure regulating valve (104). In a case where a state is changed from a state in which the motor/generator (MG) is stopped and the electric oil pump (M/O/P) is driven to a state in which the motor/generator (MG) is started and the electric oil pump (M/O/P) is stopped, when a total flow amount of a working fluid discharge flow amount of the mechanical oil pump (O/P) and a working fluid discharge flow amount of the electric oil pump (M/O/P) is equal to or greater than a pressure regulation limit flow amount of the pressure regulating valve (104), the working fluid discharge flow amount of the electric oil pump (M/O/P) is decreased.Type: ApplicationFiled: March 9, 2016Publication date: May 3, 2018Applicant: JATCO LtdInventors: Yutaka SHIMIZU, Shusaku KATAKURA, Yusuke OTA, Tomoyuki KOIKE, Yukiyoshi INUTA, Youko YOSHIOKA
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Patent number: 9958062Abstract: A CVTECU includes a secondary-pressure control section and a line-pressure control section that performs a same-pressure control to equalize a line pressure and a secondary pressure with each other if a predetermined start condition is satisfied. The line-pressure control section realizes a same-pressure state between the line pressure and the secondary pressure by lowering the line pressure below a target secondary pressure, and then controls the line pressure such that an actual secondary pressure is brought to the target secondary pressure by hydraulic feedback control while maintaining the same-pressure state. The secondary-pressure control section includes a restriction section that restricts an accumulation of integral term of an integral action for a duration between a time point at which the actual secondary pressure starts to be pushed down and a time point at which the same-pressure state between the line pressure and the secondary pressure is realized.Type: GrantFiled: February 26, 2015Date of Patent: May 1, 2018Assignee: JATCO LtdInventors: Tomoaki Honma, Seiichiro Takahashi, Takahiro Kobayashi, Takashi Eguchi, Hisao Nobu, Kenji Sakakibara
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Patent number: 9958063Abstract: A hydraulic control device controls hydraulic pressure supplied to a continuously variable transmission. The hydraulic control device includes a pressure regulating valve, a solenoid valve configured to control the pilot pressure, line pressure control means, and hydraulic control means. The pressure regulating valve includes an input port to which line pressure is input, an output port configured to supply an oil chamber of a second pulley with a second pulley pressure, a drain port configured to discharge the second pulley pressure from the oil chamber, and a spool moving according to pilot pressure to regulate the second pulley pressure. The line pressure control means is configured to control the line pressure on the basis of the second pulley pressure and first pulley pressure of first pulley. The hydraulic control means is configured to temporarily change the pilot pressure from set pressure to configure the line pressure identical to the second pulley pressure.Type: GrantFiled: February 16, 2015Date of Patent: May 1, 2018Assignee: JATCO LtdInventors: Yasuyuki Hashimoto, Seiichiro Takahashi, Tomoaki Honma, Tomoaki Kabe, Nobuhiko Morifuji, Nobuhide Kato, Hitoshi Goka, Koichi Sugita
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Publication number: 20180112771Abstract: A hydraulic control circuit includes a first pressure regulating valve for regulating a pump discharge pressure, a second pressure regulating valve for adjusting a pilot pressure to a torque converter pressure, and a first oil passage that connects an output port of the first pressure regulating valve and a torque-converter input-side oil passage, the second pressure regulating valve having an input port connected to the first oil passage through a second oil passage, a drive port connected to the first oil passage through a third oil passage, a spool axially displaced according to a drive pressure inputted into the drive port for regulating the torque converter pressure, and an output port. A throttle is provided between the connection section of the first and third oil passages and the connection section of the first and second oil passages, for adjusting the torque converter pressure to an appropriate pressure.Type: ApplicationFiled: February 3, 2016Publication date: April 26, 2018Applicant: JATCO LtdInventor: Katsuo KATOU
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Publication number: 20180106361Abstract: Disclosed is a control apparatus for a vehicular transmission comprising: a vehicle speed sensor; an accelerator opening angle sensor; and a gear-shift control section (8D) of a CVTECU 8. The vehicle speed sensor includes: an output shaft rotation speed sensor (90) configured to detect a rotation speed (rotation numbers) of an output shaft (41) of the automatic transmission; road wheel rotation speed sensors configured to detect rotation speeds (rotation numbers) of four road wheels (90B through 90E); and a vehicle speed calculating section (8B) of CVTECU 8 configured to calculate the vehicle speed from the information of the road wheel rotation speeds when a preset predetermined condition as a condition under which vertical variations of the rotation speed of the output shaft are generated is established and calculate the vehicle speed from the output shaft rotation speed information if the predetermined condition is not established.Type: ApplicationFiled: March 7, 2016Publication date: April 19, 2018Applicant: JATCO LtdInventors: Hiroki IWASA, Tetsuya IZUMI
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Publication number: 20180106368Abstract: A failure judgment device of an automatic transmission includes: a first abnormality judging section configured to judge a power supply fault abnormality or a breaking abnormality of the solenoid, from a selected shift stage and a state of the transmission mechanism, after the detection of the electric abnormality; and a second abnormality judging section configured to judge the power supply abnormality or the breaking abnormality of the solenoid, from the monitor current value when the solenoid valve is switched to an OFF state, after the detection of the electric abnormality, when one of the first abnormality judging section and the second abnormality judging section judges the power supply fault abnormality or the breaking abnormality, the judgement result being outputted.Type: ApplicationFiled: February 17, 2016Publication date: April 19, 2018Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.Inventors: Hajime TASAKA, Youji ITOU, Masahiro HAMANO, Naonori IIZUKA, Norihira AMANO, Heo Chang MOO
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Publication number: 20180106251Abstract: An oil pump is provided with an inner rotor having external teeth, an outer rotor disposed in a loose-fit state within a pump chamber and having internal teeth meshed with the external teeth, a ring-shaped pressure chamber provided adjacent to the pump chamber in a direction of a rotation axis, a discharge opening for connecting the pump chamber and the pressure chamber, and a cylindrical discharge passage having one end connected to the pressure chamber and the other end serving as a connection opening. A portion of the discharge passage is located to open inside of the outer periphery of the pressure chamber when viewed in the rotation axis direction. The one end reaches to a middle of the pressure chamber when viewed in a radial direction of the rotation axis, and the discharge passage and the pressure chamber are in direct communication with each other.Type: ApplicationFiled: February 16, 2016Publication date: April 19, 2018Applicant: JATCO LtdInventor: Atsuyuki IDE
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Publication number: 20180106363Abstract: A hydraulic control device includes: a mechanical oil pump (O/P) that is driven by a motor/generator (M/G) and that generates a first hydraulic pressure (P1); an electric oil pump (M/O/P) that is driven by a sub-motor (S/M) and that generates a second hydraulic pressure (P2); and a controller (10). When a demanded drive force from a driver is generated while in a low-vehicle-speed region which is lower than a first vehicle speed (V1) at which the output of the mechanical oil pump (O/P) becomes unstable, the controller (10) controls the electric oil pump (M/O/P) such that the second hydraulic pressure (P2) becomes larger than a compensative hydraulic pressure (P?) found by subtracting the first hydraulic pressure (P1) from a necessary hydraulic pressure (Pne) determined in accordance with the demanded drive force.Type: ApplicationFiled: March 9, 2016Publication date: April 19, 2018Applicant: JATCO LtdInventors: Shusaku KATAKURA, Yutaka SHIMIZU, Youko YOSHIOKA, Yukiyoshi INUTA, Tomoyuki KOIKE
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Publication number: 20180105162Abstract: A vehicle is provided with a mechanical oil pump (O/P) that is driven by a motor/generator (MG), an electric oil pump (M/O/P) that is driven by a sub-motor (S/M) and a second clutch (CL2) that transmits the drive force of the motor/generator (MG) to left and right drive wheels (LT, RT). When an accelerator pedal is depressed while a brake pedal is still depressed, an integrated controller (10) drives the electric oil pump (M/O/P) before the brake pedal is released, and oil pressure supplied to the second clutch (CL2) is increased.Type: ApplicationFiled: March 9, 2016Publication date: April 19, 2018Applicant: JATCO LtdInventors: Shusaku KATAKURA, Yutaka SHIMIZU, Tomoyuki KOIKE, Yukiyoshi INUTA, Youko YOSHIOKA