Patents by Inventor Tetsu Takaishi
Tetsu Takaishi 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: 10000118Abstract: A vehicle clutch control device is provided for switching from a two-wheel drive traveling to a four-wheel drive traveling. The vehicle clutch control device includes a dog clutch that separates a rear wheel drive from a front wheel drive by releasing the dog clutch, an electronically controlled coupling that distributes a driving force of a transverse engine to left and right rear wheels in accordance with a clutch connection capacity, and a four-wheel drive control unit. The four-wheel drive control unit switches the drive mode to one of a disconnect two-wheel drive mode in which the dog clutch and the electronically controlled coupling are released, a connect four-wheel drive mode in which the dog clutch and the electronically controlled coupling are engaged, and a stand-by two-wheel drive mode in which the dog clutch is engaged while the electronically controlled coupling is released.Type: GrantFiled: March 30, 2015Date of Patent: June 19, 2018Assignee: Nissan Motor Co., Ltd.Inventors: Katsuyoshi Ogawa, Atsuhiro Mori, Shunichi Mitsuishi, Makoto Morita, Tetsu Takaishi
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Patent number: 9981552Abstract: A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a 4WD control unit that controls the engagement and disengagement of the dog clutch and the friction clutch. The 4WD control unit is switchable between a two-wheel drive mode and a four-wheel drive mode. The 4WD control unit is programmed to control engagement of the dog clutch so that the dog clutch is engaged after the friction clutch is engaged and the dog clutch is synchronized. During engagement of the dog clutch, the 4WD control unit is programmed to reduce a transmission torque of the friction clutch when the dog clutch engagement standby state is detected.Type: GrantFiled: February 24, 2015Date of Patent: May 29, 2018Assignee: Nissan Motor Co., Ltd.Inventors: Katsuyoshi Ogawa, Atsuhiro Mori, Shunichi Mitsuishi, Makoto Morita, Tetsu Takaishi
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Patent number: 9845006Abstract: A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a controller that controls the engagement and disengagement of the dog clutch and the friction clutch. In this clutch control device, when there is a request to engage the dog clutch from a disengaged state, the controller, during the engagement control of the friction clutch, first controls the engagement of the friction clutch, monitors the change gradient of the clutch rotational speed difference of the dog clutch and starts engagement of the dog clutch upon determining that the gradient of the clutch rotational speed difference is no longer decreasing.Type: GrantFiled: February 24, 2015Date of Patent: December 19, 2017Assignee: Nissan Motor Co., Ltd.Inventors: Katsuyoshi Ogawa, Atsuhiro Mori, Shunichi Mitsuishi, Makoto Morita, Tetsu Takaishi
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Patent number: 9821655Abstract: A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a 4WD control unit that controls the engagement and disengagement of the dog clutch and the friction clutch. The 4WD control unit has as two-wheel drive modes, a disconnected two-wheel drive mode in which the dog clutch and the friction clutch are released, and a standby two-wheel drive mode in which the dog clutch is engaged and the friction clutch is released. The 4WD control unit is programmed to switch to the standby two-wheel drive mode when uphill movement is detected during the disconnected two-wheel drive mode.Type: GrantFiled: February 24, 2015Date of Patent: November 21, 2017Assignee: Nissan Motor Co., Ltd.Inventors: Katsuyoshi Ogawa, Atsuhiro Mori, Shunichi Mitsuishi, Makoto Morita, Tetsu Takaishi
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Patent number: 9783053Abstract: A clutch control device is provided for a 4-wheel drive vehicle. The clutch control device includes a 4WD control unit that controls the engagement and release of a friction clutch and a dog clutch which are arranged separately in the two paths. The 4WD control unit has a synchronization speed control unit, and at a time of transition from a disconnected, two-wheel drive mode, in which the friction clutch and the dog clutch are released, to a connected, four-wheel drive mode, in which the friction clutch and the dog clutch are engaged, the synchronization speed control unit reduces a synchronization speed of the dog clutch more during vehicle deceleration than when the vehicle is not decelerating.Type: GrantFiled: February 24, 2015Date of Patent: October 10, 2017Assignee: Nissan Motor Co., Ltd.Inventors: Katsuyoshi Ogawa, Atsuhiro Mori, Shunichi Mitsuishi, Makoto Morita, Tetsu Takaishi
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Patent number: 9758038Abstract: A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a controller that controls the engagement and disengagement of the dog clutch and the friction clutch. In this clutch control device, the four-wheel drive hybrid vehicle includes a disconnected, two-wheel drive mode and a connected, four-wheel drive mode. When a driver's foot is lifted off an accelerator in a low-speed region when the connected, four-wheel drive mode is selected, the 4WD control unit maintains the connected, four-wheel drive mode while the brakes are not depressed, and shifts the mode to the disconnected, two-wheel drive mode when the brakes are depressed.Type: GrantFiled: February 24, 2015Date of Patent: September 12, 2017Assignee: Nissan Motor Co., Ltd.Inventors: Katsuyoshi Ogawa, Atsuhiro Mori, Shunichi Mitsuishi, Makoto Morita, Tetsu Takaishi
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Publication number: 20170182887Abstract: A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a 4WD control unit that controls the engagement and disengagement of the dog clutch and the friction clutch. The 4WD control unit is switchable between a two-wheel drive mode and a four-wheel drive mode. The 4WD control unit is programmed to control engagement of the dog clutch so that the dog clutch is engaged after the friction clutch is engaged and the dog clutch is synchronized. During engagement of the dog clutch, the 4WD control unit is programmed to reduce a transmission torque of the friction clutch when the dog clutch engagement standby state is detected.Type: ApplicationFiled: February 24, 2015Publication date: June 29, 2017Inventors: Katsuyoshi OGAWA, Atsuhiro MORI, Shunichi MITSUISHI, Makoto MORITA, Tetsu TAKAISHI
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Patent number: 9688141Abstract: A clutch control device is provided for a four-wheel drive vehicle. The clutch control device is able to suppress the elevation of the temperature of the oil supplied to a friction clutch during two-wheel drive travel when the friction clutch is released. The clutch control device includes a dog clutch and an electronic control coupling. The friction clutch is housed in a coupling case. When the dog clutch and the friction clutch are released, a two-wheel drive mode is selected. The coupling case has a passage opening that is closed to retain lubrication oil in an oil chamber with respect to a clutch chamber that houses the friction clutch. When oil stirring conditions are met thereafter, the passage opening is opened and the lubrication oil is allowed to flow into the clutch chamber from the oil chamber.Type: GrantFiled: February 4, 2015Date of Patent: June 27, 2017Assignee: Nissan Motor Co., Ltd.Inventors: Tetsu Takaishi, Atsuhiro Mori, Shunichi Mitsuishi, Makoto Morita, Katsuyoshi Ogawa
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Patent number: 9688142Abstract: A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a controller that controls the dog clutch and the friction clutch. The controller starts the engagement of the dog clutch, after placing the dog clutch in a rotationally synchronized state by engaging the friction clutch and increasing an output rotation thereof, when there is a request to engage the dog clutch. In this clutch control device, the controller sets the engagement start timing of the friction clutch when a transition is made to the connected, four-wheel drive mode to an earlier timing compared to when a transition is made to the standby two-wheel drive mode, when there is a request to engage the dog clutch while in a state in which the disconnected, two-wheel drive mode is selected.Type: GrantFiled: February 24, 2015Date of Patent: June 27, 2017Assignee: Nissan Motor Co., Ltd.Inventors: Katsuyoshi Ogawa, Atsuhiro Mori, Shunichi Mitsuishi, Makoto Morita, Tetsu Takaishi
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Publication number: 20170166052Abstract: A clutch control device is provided for a 4-wheel drive vehicle. The clutch control device includes a 4WD control unit that controls the engagement and release of a friction clutch and a dog clutch which are arranged separately in the two paths. The 4WD control unit has a synchronization speed control unit, and at a time of transition from a disconnected, two-wheel drive mode, in which the friction clutch and the dog clutch are released, to a connected, four-wheel drive mode, in which the friction clutch and the dog clutch are engaged, the synchronization speed control unit reduces a synchronization speed of the dog clutch more during vehicle deceleration than when the vehicle is not decelerating.Type: ApplicationFiled: February 24, 2015Publication date: June 15, 2017Inventors: Katsuyoshi OGAWA, Atsuhiro MORI, Shunichi MITSUISHI, Makoto MORITA, Tetsu TAKAISHI
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Publication number: 20170166053Abstract: A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a 4WD control unit that controls the engagement and disengagement of the dog clutch and the friction clutch. The 4WD control unit has as two-wheel drive modes, a disconnected two-wheel drive mode in which the dog clutch and the friction clutch are released, and a standby two-wheel drive mode in which the dog clutch is engaged and the friction clutch is released. The 4WD control unit is programmed to switch to the standby two-wheel drive mode when uphill movement is detected during the disconnected two-wheel drive mode.Type: ApplicationFiled: February 24, 2015Publication date: June 15, 2017Inventors: Katsuyoshi OGAWA, Atsuhiro MORI, Shunichi MITSUISHI, Makoto MORITA, Tetsu TAKAISHI
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Publication number: 20170028843Abstract: A vehicle clutch control device is provided for switching from a two-wheel drive traveling to a four-wheel drive traveling. The vehicle clutch control device includes a dog clutch that separates a rear wheel drive from a front wheel drive by releasing the dog clutch, an electronically controlled coupling that distributes a driving force of a transverse engine to left and right rear wheels in accordance with a clutch connection capacity, and a four-wheel drive control unit. The four-wheel drive control unit switches the drive mode to one of a disconnect two-wheel drive mode in which the dog clutch and the electronically controlled coupling are released, a connect four-wheel drive mode in which the dog clutch and the electronically controlled coupling are engaged, and a stand-by two-wheel drive mode in which the dog clutch is engaged while the electronically controlled coupling is released.Type: ApplicationFiled: March 30, 2015Publication date: February 2, 2017Applicant: Nissan Motor Co., Ltd.Inventors: Katsuyoshi OGAWA, Atsuhiro MORI, Shunichi MITSUISHI, Makoto MORITA, Tetsu TAKAISHI
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Publication number: 20170008396Abstract: A clutch control device is provided for a four-wheel drive vehicle. The clutch control device is able to suppress the elevation of the temperature of the oil supplied to a friction clutch during two-wheel drive travel when the friction clutch is released. The clutch control device includes a dog clutch and an electronic control coupling. The friction clutch is housed in a coupling case. When the dog clutch and the friction clutch are released, a two-wheel drive mode is selected. The coupling case has a passage opening that is closed to retain lubrication oil in an oil chamber with respect to a clutch chamber that houses the friction clutch. When oil stirring conditions are met thereafter, the passage opening is opened and the lubrication oil is allowed to flow into the clutch chamber from the oil chamber.Type: ApplicationFiled: February 4, 2015Publication date: January 12, 2017Inventors: Tetsu TAKAISHI, Atsuhiro MORI, Shunichi MITSUISHI, Makoto MORITA, Katsuyoshi OGAWA
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Publication number: 20160355089Abstract: A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a controller that controls the dog clutch and the friction clutch. The controller starts the engagement of the dog clutch, after placing the dog clutch in a rotationally synchronized state by engaging the friction clutch and increasing an output rotation thereof, when there is a request to engage the dog clutch. In this clutch control device, the controller sets the engagement start timing of the friction clutch when a transition is made to the connected, four-wheel drive mode to an earlier timing compared to when a transition is made to the standby two-wheel drive mode, when there is a request to engage the dog clutch while in a state in which the disconnected, two-wheel drive mode is selected.Type: ApplicationFiled: February 24, 2015Publication date: December 8, 2016Inventors: Katsuyoshi OGAWA, Atsuhiro MORI, Shunichi MITSUISHI, Makoto MORITA, Tetsu TAKAISHI
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Publication number: 20160355086Abstract: A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a controller that controls the engagement and disengagement of the dog clutch and the friction clutch. In this clutch control device, when there is a request to engage the dog clutch from a disengaged state, the controller, during the engagement control of the friction clutch, first controls the engagement of the friction clutch, monitors the change gradient of the clutch rotational speed difference of the dog clutch and starts engagement of the dog clutch upon determining that the gradient of the clutch rotational speed difference is no longer decreasing.Type: ApplicationFiled: February 24, 2015Publication date: December 8, 2016Applicant: Nissan Motor Co., Ltd.Inventors: Katsuyoshi OGAWA, Atsuhiro MORI, Shunichi MITSUISHI, Makoto MORITA, Tetsu TAKAISHI
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Publication number: 20160347171Abstract: A clutch control device is provided for a four-wheel drive vehicle for transmitting drive force to the rear wheels. The clutch control device includes a dog clutch and a friction clutch, and a controller that controls the engagement and disengagement of the dog clutch and the friction clutch. In this clutch control device, the four-wheel drive hybrid vehicle includes a disconnected, two-wheel drive mode and a connected, four-wheel drive mode. When a driver's foot is lifted off an accelerator in a low-speed region when the connected, four-wheel drive mode is selected, the 4WD control unit maintains the connected, four-wheel drive mode while the brakes are not depressed, and shifts the mode to the disconnected, two-wheel drive mode when the brakes are depressed.Type: ApplicationFiled: February 24, 2015Publication date: December 1, 2016Inventors: Katsuyoshi OGAWA, Atsuhiro MORI, Shunichi MITSUISHI, Makoto MORITA, Tetsu TAKAISHI
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Patent number: 9206889Abstract: A drive force distributing device includes first and second rollers rotatable jointly with main a drive wheel system and a subordinate drive wheel system, respectively. Control of the drive force distribution between the main drive wheels and the subordinate drive wheels is performed by adjusting an inter-roller pressing force. A structural body suppresses turning of one of the first and second rollers at a predetermined position. A reference position setting mechanism turns either one of the first and second rollers to turn in one direction, detects a position at which the turn is suppressed by the structural body, and sets a reference position based on the detected position. A turning amount of one of the first and second rollers is detected with respect to the reference position set by the reference position setting mechanism and the control of drive force distributing is performed based on the detected turning amount.Type: GrantFiled: July 10, 2013Date of Patent: December 8, 2015Assignee: NISSAN MOTOR CO., LTD.Inventors: Tetsu Takaishi, Atsuhiro Mori, Shunichi Mitsuishi, Eigo Sakagami, Katsuyoshi Ogawa
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Patent number: 9200698Abstract: In a roller-type friction transmission unit, outer peripheral surfaces of first and second rollers are pressed in a radial direction into pressing contact with one another, to allow frictional power transmission between the first and second rollers. The first roller is connected to a driveline to main driving wheels of a four wheel drive vehicle. The second roller is connected to a driveline to auxiliary driving wheels of the four wheel drive vehicle. The transmitted torque capacity between the first roller and the second roller is controlled by changing a distance between rotation axes of the first and second rollers. The outer peripheral surfaces of the first and second rollers are shaped to allow the outer peripheral surfaces of the first and second rollers to be in contact with one another at a plurality of spots arranged in an axial direction.Type: GrantFiled: September 27, 2011Date of Patent: December 1, 2015Assignee: NISSAN MOTOR CO., LTD.Inventor: Tetsu Takaishi
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Publication number: 20140031167Abstract: A drive force distributing device includes first and second rollers rotatable jointly with main a drive wheel system and a subordinate drive wheel system, respectively. Control of the drive force distribution between the main drive wheels and the subordinate drive wheels is performed by adjusting an inter-roller pressing force. A structural body suppresses turning of one of the first and second rollers at a predetermined position. A reference position setting mechanism turns either one of the first and second rollers to turn in one direction, detects a position at which the turn is suppressed by the structural body, and sets a reference position based on the detected position. A turning amount of one of the first and second rollers is detected with respect to the reference position set by the reference position setting mechanism and the control of drive force distributing is performed based on the detected turning amount.Type: ApplicationFiled: July 10, 2013Publication date: January 30, 2014Applicant: NISSAN MOTOR CO., LTD.Inventors: Tetsu TAKAISHI, Atsuhiro MORI, Shunichi MITSUISHI, Eigo SAKAGAMI, Katsuyoshi OGAWA
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Publication number: 20140018205Abstract: A drive force distributing apparatus includes a first roller that is rotatable with a main drive wheel system and a second roller that is rotatable with a subordinate drive wheel system. Control of the drive force distribution between the main drive wheel system and the subordinate drive wheel system is carried out by turning the second roller by the rotation of a crankshaft to thereby adjust a radial pressing force of the second roller against the first roller. A bearing support includes an exterior wall disposed in a housing, a first through bore formed in the exterior wall for receiving a shaft portion of the first roller, a first interior side wall extending radially outward from the first through bore, a second through bore formed in the exterior wall for receiving a crankshaft, and a second interior side wall extending radially outward from the second through bore.Type: ApplicationFiled: June 27, 2013Publication date: January 16, 2014Inventors: Tetsu TAKAISHI, Atsuhiro MORI, Shunichi MITSUISHI, Eigo SAKAGAMI, Katsuyoshi OGAWA