Patents by Inventor Hideharu Yamamoto
Hideharu Yamamoto 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: 8579759Abstract: A hybrid electric vehicle has a first mode in which slippage of a clutch between an electric motor and a driving wheel is allowed and controlled by rotational speed control of the electric motor and a second mode in which the slippage of the clutch is allowed and controlled by rotational speed control of an engine. When the vehicle is stationary in the first mode, a controller reduces a control setpoint of hydraulic pressure of the clutch from an initial point. The controller identifies a reference point of the control setpoint with which actual output torque of the electric motor is substantially constant with respect to the reduction of the control setpoint. Then, the controller increases the control setpoint to a precharge point, and reduces the control setpoint to a corrected point that is lower than or substantially equal to the initial point and higher than the reference point.Type: GrantFiled: October 28, 2011Date of Patent: November 12, 2013Assignee: JATCO LtdInventors: Hiromichi Akebono, Hideharu Yamamoto, Kota Miura, Hisashi Saito
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Patent number: 8532893Abstract: In an automatic transmission with a speed changer having a plurality of engagement elements and configured to shift the speed changer into a selected one of a plurality of shift stages by switching engaged and disengaged states of the engagement elements, a first rotation sensor is provided for detecting input rotation of the speed changer and a second rotation sensor for detecting output rotation of the speed changer. Also provided is a transmission controller configured to determine whether a change in input torque inputted into the speed changer occurs. The transmission controller is further configured to determine that interlock has occurred in the speed changer, when there is no pulse signal output from the second rotation sensor though, during a vehicle stopped state, the input-torque change has occurred and the pulse signal from the first rotation sensor has been outputted.Type: GrantFiled: June 6, 2011Date of Patent: September 10, 2013Assignee: Jatco LtdInventors: Yutaka Tohyama, Hideharu Yamamoto, Masahiro Hamano, Hiroyasu Tanaka, Youhei Ishikawa
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Patent number: 8444530Abstract: An automatic transmission system includes a transmission having transmission elements with lubrication-requiring portions and hydraulic actuators therefor, a switching valve that supplies hydraulic fluid to the hydraulic actuators, a valve actuator that actuates the switching valve, a shift range detection unit that detects a selected shift range of the transmission, and a control unit that controls the valve actuator to actuate the switching valve in accordance with the selected transmission shift range. The switching valve has a bypass position to provide a supply of the hydraulic fluid to the lubrication-requiring portions by bypassing a transmission oil cooler. The control unit judges whether the transmission is in a low lubrication state based on a given operating parameter of the transmission and controls the valve actuator to switch the switching valve to the bypass position at the time the transmission is judged as being in the low lubrication state.Type: GrantFiled: August 12, 2009Date of Patent: May 21, 2013Assignee: JATCO LtdInventors: Hideharu Yamamoto, Kenichi Kaizu, Hideki Ishii, Toshiomi Nebashi, Fumitaka Nagashima, Ryusuke Ooshiro
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Patent number: 8437933Abstract: A hybrid electric vehicle has a first mode in which slippage of a clutch between an electric motor and a driving wheel is allowed and controlled by rotational speed control of the electric motor and a second mode in which the slippage of the clutch is allowed and controlled by rotational speed control of an engine. When the vehicle is stationary in the first mode, a controller reduces a control setpoint of hydraulic pressure of the clutch from an initial point. The controller identifies a reference point of the control setpoint with which actual output torque of the electric motor is substantially constant with respect to the reduction of the control setpoint. Then, the controller increases the control setpoint to a precharge point, and reduces the control setpoint to a corrected point that is lower than or substantially equal to the initial point and higher than the reference point.Type: GrantFiled: October 28, 2011Date of Patent: May 7, 2013Assignee: Jatco LtdInventors: Hiromichi Akebono, Hideharu Yamamoto, Kota Miura, Hisashi Saito
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Patent number: 8393998Abstract: A hybrid electric vehicle has a first mode in which slippage of a clutch between an electric motor and a driving wheel is allowed and controlled by rotational speed control of the electric motor and a second mode in which the slippage of the clutch is allowed and controlled by rotational speed control of an engine. When the vehicle is stationary in the first mode, a controller reduces a control setpoint of hydraulic pressure of the clutch from an initial point. The controller identifies a reference point of the control setpoint with which actual output torque of the electric motor is substantially constant with respect to the reduction of the control setpoint. Then, the controller increases the control setpoint to a precharge point, and reduces the control setpoint to a corrected point that is lower than or substantially equal to the initial point and higher than the reference point.Type: GrantFiled: October 28, 2011Date of Patent: March 12, 2013Assignee: Jatco LtdInventors: Hiromichi Akebono, Hideharu Yamamoto, Kota Miura, Hisashi Saito
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Publication number: 20120203406Abstract: A hybrid electric vehicle has a first mode in which slippage of a clutch between an electric motor and a driving wheel is allowed and controlled by rotational speed control of the electric motor and a second mode in which the slippage of the clutch is allowed and controlled by rotational speed control of an engine. When the vehicle is stationary in the first mode, a controller reduces a control setpoint of hydraulic pressure of the clutch from an initial point. The controller identifies a reference point of the control setpoint with which actual output torque of the electric motor becomes unchanged with respect to the reduction of the control setpoint. Then, the controller increases the control setpoint from the reference point at a higher gradient and then a lower gradient, and then sets the control setpoint to a corrected point below the initial point and above the reference point.Type: ApplicationFiled: January 30, 2012Publication date: August 9, 2012Inventors: Hiromichi AKEBONO, Hideharu YAMAMOTO, Kota MIURA, Hisashi SAITO
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Publication number: 20120143448Abstract: In an automatic transmission with a speed changer having a plurality of engagement elements and configured to shift the speed changer into a selected one of a plurality of shift stages by switching engaged and disengaged states of the engagement elements, a first rotation sensor is provided for detecting input rotation of the speed changer and a second rotation sensor for detecting output rotation of the speed changer. Also provided is a transmission controller configured to determine whether a change in input torque inputted into the speed changer occurs. The transmission controller is further configured to determine that interlock has occurred in the speed changer, when there is no pulse signal output from the second rotation sensor though, during a vehicle stopped state, the input-torque change has occurred and the pulse signal from the first rotation sensor has been outputted.Type: ApplicationFiled: June 6, 2011Publication date: June 7, 2012Inventors: Yutaka TOHYAMA, Hideharu Yamamoto, Masahiro Hamano, Hiroyasu Tanaka, Youhei Ishikawa
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Publication number: 20120108388Abstract: A hybrid electric vehicle has a first mode in which slippage of a clutch between an electric motor and a driving wheel is allowed and controlled by rotational speed control of the electric motor and a second mode in which the slippage of the clutch is allowed and controlled by rotational speed control of an engine. When the vehicle is stationary in the first mode, a controller reduces a control setpoint of hydraulic pressure of the clutch from an initial point. The controller identifies a reference point of the control setpoint with which actual output torque of the electric motor is substantially constant with respect to the reduction of the control setpoint. Then, the controller increases the control setpoint to a precharge point, and reduces the control setpoint to a corrected point that is lower than or substantially equal to the initial point and higher than the reference point.Type: ApplicationFiled: October 28, 2011Publication date: May 3, 2012Inventors: Hiromichi AKEBONO, Hideharu YAMAMOTO, Kota MIURA, Hisashi SAITO
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Publication number: 20120109439Abstract: In control apparatus and method for a vehicle, the vehicle including a traveling mode (a WSC traveling mode) in which a slip control is performed for a clutch (second clutch CL2) and a revolution speed control is performed for the driving source such that a revolution speed at a driving source side of the clutch becomes higher than that at a driving wheel side of the clutch by a predetermined revolution speed, an actual torque of a driving source of the vehicle is detected, a command hydraulic pressure is reduced from an initial command hydraulic pressure and a post-correction command hydraulic pressure is set on a basis of the command hydraulic pressure when a variation in the actual torque of the driving source along with the reduction of the command hydraulic pressure is determined to end, when a vehicle stopped state is determined to occur during the traveling mode.Type: ApplicationFiled: October 28, 2011Publication date: May 3, 2012Inventors: Hiromichi AKEBONO, Hideharu YAMAMOTO, Kota MIURA, Hisashi SAITO
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Publication number: 20120103709Abstract: In control apparatus and method for a hybrid vehicle, a line pressure control valve disposed at a downstream side of each of mechanical oil pump (M-O/P) and electrically driven oil pump (S-O/P) to decrease a supplied hydraulic pressure from at least one of the mechanical oil pump and the electrically driven oil pump by opening drain ports thereof in accordance with a control valve command value is provided, the control valve command value is set by adding a predetermined additive correction quantity to a required line pressure set in accordance with operating states of a hydraulic pressure clutch (CL1) and a transmission and the drain ports of the line pressure control valve are controlled to a closure side, during an actuation of the electrically driven oil pump.Type: ApplicationFiled: October 26, 2011Publication date: May 3, 2012Inventors: Shinya Mochiyama, Hiroki Kawakami, Hideharu Yamamoto
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Publication number: 20120109438Abstract: A hybrid electric vehicle has a first mode in which slippage of a clutch between an electric motor and a driving wheel is allowed and controlled by rotational speed control of the electric motor and a second mode in which the slippage of the clutch is allowed and controlled by rotational speed control of an engine. When the vehicle is stationary in the first mode, a controller reduces a control setpoint of hydraulic pressure of the clutch from an initial point. The controller identifies a reference point of the control setpoint with which actual output torque of the electric motor is substantially constant with respect to the reduction of the control setpoint. Then, the controller increases the control setpoint to a precharge point, and reduces the control setpoint to a corrected point that is lower than or substantially equal to the initial point and higher than the reference point.Type: ApplicationFiled: October 28, 2011Publication date: May 3, 2012Inventors: Hiromichi AKEBONO, Hideharu Yamamoto, Kota Miura, Hisashi Saito
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Publication number: 20120109478Abstract: The hydraulic control apparatus calculates a target engagement hydraulic pressure of a frictional engagement element, controls the frictional engagement element so that a revolution speed at a driving source side of the frictional engagement element is higher than a revolution speed at a driving wheel side of the frictional engagement element, outputs a command current to a solenoid valve on the basis of a map having a relationship between the target engagement hydraulic pressure and the command current, and decreases the engagement hydraulic pressure when a vehicle speed is equal to or less than a predetermined vehicle speed at which the vehicle is judged to be vehicle stop during execution of the slip control. Further, the hydraulic control apparatus corrects the map so that a variation of the command current with respect to a variation of the target engagement hydraulic pressure is small when decreasing the engagement hydraulic pressure.Type: ApplicationFiled: October 28, 2011Publication date: May 3, 2012Inventors: Shinya MOCHIYAMA, Hideharu YAMAMOTO
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Publication number: 20120108387Abstract: A hybrid electric vehicle has a first mode in which slippage of a clutch between an electric motor and a driving wheel is allowed and controlled by rotational speed control of the electric motor and a second mode in which the slippage of the clutch is allowed and controlled by rotational speed control of an engine. When the vehicle is stationary in the first mode, a controller reduces a control setpoint of hydraulic pressure of the clutch from an initial point. The controller identifies a reference point of the control setpoint with which actual output torque of the electric motor is substantially constant with respect to the reduction of the control setpoint. Then, the controller increases the control setpoint to a precharge point, and reduces the control setpoint to a corrected point that is lower than or substantially equal to the initial point and higher than the reference point.Type: ApplicationFiled: October 28, 2011Publication date: May 3, 2012Inventors: Hiromichi AKEBONO, Hideharu YAMAMOTO, Kota MIURA, Hisashi SAITO
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Patent number: 7713167Abstract: An automatic transmissions control system varies times to start a shift to securing a good response in engagement pressure for an engagement-side frictional element as well as suppressing occurrence of hydraulic pressure vibrations at low temperatures.Type: GrantFiled: March 15, 2007Date of Patent: May 11, 2010Assignee: Jatco LtdInventors: Hideharu Yamamoto, Kenichi Kaizu, Hiroshi Sekiguchi, Yukiyoshi Inuta, Hiroki Kumashiro
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Publication number: 20100057315Abstract: An automatic transmission system includes a transmission having transmission elements with lubrication-requiring portions and hydraulic actuators therefor, a switching valve that supplies hydraulic fluid to the hydraulic actuators, a valve actuator that actuates the switching valve, a shift range detection unit that detects a selected shift range of the transmission, and a control unit that controls the valve actuator to actuate the switching valve in accordance with the selected transmission shift range. The switching valve has a bypass position to provide a supply of the hydraulic fluid to the lubrication-requiring portions by bypassing a transmission oil cooler. The control unit judges whether the transmission is in a low lubrication state based on a given operating parameter of the transmission and controls the valve actuator to switch the switching valve to the bypass position at the time the transmission is judged as being in the low lubrication state.Type: ApplicationFiled: August 12, 2009Publication date: March 4, 2010Inventors: Hideharu YAMAMOTO, Kenichi KAIZU, Hideki ISHI, Toshiomi NEBASHI, Fumitaka NAGASHIMA, Ryusuke OOSHIRO
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Publication number: 20070232445Abstract: An automatic transmissions control system varies times to start a shift to securing a good response in engagement pressure for an engagement-side frictional element as well as suppressing occurrence of hydraulic pressure vibrations at low temperatures.Type: ApplicationFiled: March 15, 2007Publication date: October 4, 2007Applicant: JATCO Ltd.Inventors: Hideharu YAMAMOTO, Kenichi KAIZU, Hiroshi SEKIGUCHI, Yukiyoshi INUTA, Hiroki KUMASHIRO
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Patent number: 7104911Abstract: A hydraulic control device for an automatic transmission comprises an engagement element pressure control section for controlling an engagement element pressure, engagement elements supplied with the engagement element pressure, and an oil pressure switches provided in oil supply paths of the engagement element pressure. The plural gear positions are achieved by engaging or disengaging the engagement elements. The engagement element pressure control section controls the engagement element pressure with a first gain when the engagement elements are in the shifting state and controls the engagement element pressure with a second gain when the engagement elements are in the engagement state.Type: GrantFiled: September 15, 2004Date of Patent: September 12, 2006Assignee: Jatco LTDInventors: Kenichi Kaizu, Hideharu Yamamoto
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Patent number: 7074482Abstract: An antibacterial polyamide filament which comprises a polyamide resin containing 0.1 to 5.0 mass % of fine zinc oxide particles and exhibits a color difference caused by the treatment with an alkaline solution of 2.5 or less; and a method for producing the antibacterial polyamide filament which comprises adjusting the moisture content of a polyamide resin chip to 0.05 to 2.0 mass %, followed by melt spinning. Preferably, the antibacterial polyamide filament has a bacteriostatic activity after 50 washings of 2.2 or more, which filament can be produced by melt-spinning the polyamide resin to melt spinning and solidifying the resin at a position 400 mm or less from the face of a spinning nozzle.Type: GrantFiled: October 25, 2000Date of Patent: July 11, 2006Assignee: Unitika Fibers Ltd.Inventors: Masaki Nishimura, Takeshi Nishiyama, Mitsuo Omori, Eiji Tsukamoto, Seiji Abe, Masahiro Hosoda, Hideharu Yamamoto, Minoru Fujii, Shuhei Kurata, Kunio Akasaki
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Publication number: 20050064982Abstract: A hydraulic control device for an automatic transmission comprises an engagement element pressure control section for controlling an engagement element pressure, engagement elements supplied with the engagement element pressure, and an oil pressure switches provided in oil supply paths of the engagement element pressure. The plural gear positions are achieved by engaging or disengaging the engagement elements. The engagement element pressure control section controls the engagement element pressure with a first gain when the engagement elements are in the shifting state and controls the engagement element pressure with a second gain when the engagement elements are in the engagement state.Type: ApplicationFiled: September 15, 2004Publication date: March 24, 2005Inventors: Kenichi Kaizu, Hideharu Yamamoto
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Patent number: 6203467Abstract: A lubricating mechanism of a toroidal continuously variable transmission comprises a first supply port (107) for supplying lubricating oil to a contact surface of an input disk (17, 19) and output disk (18, 20) with a power roller (70, 71, 170, 171), and a second supply port (114) for supplying lubricating oil to a bearing (71A) supporting the power roller (70, 71, 170, 171) on a trunnion (72, 73) are provided. A first oil passage (105, 106) for connecting the oil pump (5) to either one of the first supply port (107) and second supply port (114), and a second oil passage (108, 109, 110, 112, 113) for connecting an oil cooler (50) to the other one of the first supply port (107) and second supply port (114), are provided. Insufficiency of lubricating oil is prevented by having two different sources to supply lubricating oil to the bearing (71A) and the contact surface of the power roller (70, 71, 170, 171).Type: GrantFiled: August 2, 1999Date of Patent: March 20, 2001Assignee: Nissan Motor Co., Ltd.Inventors: Hideharu Yamamoto, Masaki Nakano