Patents by Inventor Yasushi Inagawa
Yasushi Inagawa 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: 10082204Abstract: A control apparatus of an automatic transmission including a plurality of gear mechanisms, frictional elements, an oil pressure supply device which supplies an oil pressure for operating the frictional elements between an engaged state and a disengaged state and an oil pressure controller which controls an oil pressure for operating the plurality of frictional elements. The oil pressure controller determines a heat quantity absorbed by the plurality of frictional elements when the frictional elements are switched between the engaged state and the disengaged state, and changes an operation state before the frictional elements proceed to the engaged state or the disengaged state, in accordance with whether the frictional elements have absorbed a predetermined heat quantity.Type: GrantFiled: March 14, 2017Date of Patent: September 25, 2018Assignee: Honda Motor Co., Ltd.Inventor: Yasushi Inagawa
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Publication number: 20170268665Abstract: A control apparatus of an automatic transmission including a plurality of gear mechanisms, frictional elements, an oil pressure supply device which supplies an oil pressure for operating the frictional elements between an engaged state and a disengaged state and an oil pressure controller which controls an oil pressure for operating the plurality of frictional elements. The oil pressure controller determines a heat quantity absorbed by the plurality of frictional elements when the frictional elements are switched between the engaged state and the disengaged state, and changes an operation state before the frictional elements proceed to the engaged state or the disengaged state, in accordance with whether the frictional elements have absorbed a predetermined heat quantity.Type: ApplicationFiled: March 14, 2017Publication date: September 21, 2017Inventor: Yasushi Inagawa
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Patent number: 9458930Abstract: Adding a driver's intention and running environments to conditions for cancelling a delay of an upshift after kickdown enables the upshift at a suitable timing depending on a vehicle's running environments and aspects of the driver's operation. A shift control device for automatic transmission calculates an allowance driving force of the vehicle when upshifting at a current vehicle speed and throttle opening, and also calculates a threshold value of a driving force depending on an average value of throttle opening variation, an average value of vehicle speed variation, a cornering judgment of a winding degree of a road on which the vehicle is running and a gradient judgment of a gradient of a road surface on which the vehicle is running. Then, after comparing the threshold value and the allowance driving force, the device permits an upshift when the allowance driving force is larger than the threshold value.Type: GrantFiled: April 12, 2013Date of Patent: October 4, 2016Assignee: HONDA MOTOR CO., LTD.Inventors: Yasushi Inagawa, Yoshiharu Saito, Christoph Karger
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Publication number: 20150184742Abstract: Adding a driver's intention and running environments to conditions for cancelling a delay of an upshift after kickdown enables the upshift at a suitable timing depending on a vehicle's running environments and aspects of the driver's operation. A shift control device for automatic transmission calculates an allowance driving force of the vehicle when upshifting at a current vehicle speed and throttle opening, and also calculates a threshold value of a driving force depending on an average value of throttle opening variation, an average value of vehicle speed variation, a cornering judgment of a winding degree of a road on which the vehicle is running and a gradient judgment of a gradient of a road surface on which the vehicle is running. Then, after comparing the threshold value and the allowance driving force, the device permits an upshift when the allowance driving force is larger than the threshold value.Type: ApplicationFiled: April 12, 2013Publication date: July 2, 2015Inventors: Yasushi Inagawa, Yoshiharu Saito, Christoph Karger
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Patent number: 8930099Abstract: In a control apparatus for an automatic transmission, it is configured to calculate a change amount (?NC estimation value) of an output rotational speed of the transmission (S10); calculate an average (I phase initial average G) of the change amount of the output rotational speed over a predetermined period of an initial inertia (I) phase of shifting; calculate an average (after-shift average G) of a vehicle acceleration after the completion of the shifting, assuming that the change amount of the output rotational speed indicates the vehicle acceleration G; calculate a difference (I phase initial G) between the average of the change amount of the output rotational speed and the average of the vehicle acceleration; incrementally and decrementally correct the desired value of the transmission torque of the frictional engaging element such that the calculated difference falls within a predetermined range; and control supply of hydraulic pressure to the frictional engaging element such that it becomes the correctType: GrantFiled: November 19, 2010Date of Patent: January 6, 2015Assignee: Honda Motor Co., Ltd.Inventors: Yasushi Inagawa, Shintaro Kameda, Atsuhiro Saeki, Takahiro Matsuda, Hidekazu Araki, Hiroyuki Okuda, Yuji Yasui
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Patent number: 8833191Abstract: In a control apparatus for an automatic transmission having multiple speeds constituted by four sets and speed selecting mechanisms corresponding to the four sets, assuming the speeds as seven among eight speeds of A to H in order of gear ratio, the four sets are constituted by a first set of A having a largest gear ratio and C that is next but one; a second set including at least H having a smallest gear ratio; a third set of B and D between two of the first set; and a fourth set including two of E, F and G between the second and third sets, and one of first and second pressure regulators selectively supplies hydraulic pressure to two of the mechanisms corresponding to the first and second sets, while the other thereof selectively supplies hydraulic pressure to two of the mechanisms corresponding to the third and fourth sets.Type: GrantFiled: May 21, 2012Date of Patent: September 16, 2014Assignee: Honda Motor Co., Ltd.Inventors: Noriyuki Yagi, Yasushi Inagawa, Shirou Godai, Hirotake Omoto
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Publication number: 20130025389Abstract: In a control apparatus for an automatic transmission having multiple speeds constituted by four sets and speed selecting mechanisms corresponding to the four sets, assuming the speeds as seven among eight speeds of A to H in order of gear ratio, the four sets are constituted by a first set of A having a largest gear ratio and C that is next but one; a second set including at least H having a smallest gear ratio; a third set of B and D between two of the first set; and a fourth set including two of E, F and G between the second and third sets, and one of first and second pressure regulators selectively supplies hydraulic pressure to two of the mechanisms corresponding to the first and second sets, while the other thereof selectively supplies hydraulic pressure to two of the mechanisms corresponding to the third and fourth sets.Type: ApplicationFiled: May 21, 2012Publication date: January 31, 2013Applicant: HONDA MOTOR CO., LTDInventors: Noriyuki Yagi, Yasushi Inagawa, Shirou Godai, Hirotake Omoto
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Publication number: 20120232764Abstract: In a control apparatus for an automatic transmission, it is configured to calculate a change amount (?NC estimation value) of an output rotational speed of the transmission (S10); calculate an average (I phase initial average G) of the change amount of the output rotational speed over a predetermined period of an initial inertia (I) phase of shifting; calculate an average (after-shift average G) of a vehicle acceleration after the completion of the shifting, assuming that the change amount of the output rotational speed indicates the vehicle acceleration G; calculate a difference (I phase initial G) between the average of the change amount of the output rotational speed and the average of the vehicle acceleration; incrementally and decrementally correct the desired value of the transmission torque of the frictional engaging element such that the calculated difference falls within a predetermined range; and control supply of hydraulic pressure to the frictional engaging element such that it becomes the correctType: ApplicationFiled: November 19, 2010Publication date: September 13, 2012Applicant: Honda Motor Co., Ltd.Inventors: Yasushi Inagawa, Shintaro Kameda, Atsuhiro Saeki, Takahiro Matsuda, Hidekazu Araki, Hiroyuki Okuda, Yuji Yasui
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Patent number: 7433770Abstract: A hydraulic fluid change indicating device for an automatic transmission includes a first deterioration rate calculating unit; a deterioration acceleration coefficient calculating unit; and a thermal hydraulic fluid deterioration calculating unit for calculating a thermal hydraulic fluid deterioration according to the first deterioration rate and the deterioration acceleration coefficient. The device further includes a second deterioration rate calculating unit according to an engine speed, input shaft speed, and output shaft speed; a mechanical hydraulic fluid deterioration calculating unit for calculating a mechanical fluid deterioration according to the second deterioration rate; and a determining unit for determining whether or not the thermal hydraulic fluid deterioration or the mechanical hydraulic fluid deterioration is greater than a predetermined hydraulic fluid change threshold.Type: GrantFiled: December 3, 2004Date of Patent: October 7, 2008Assignee: Honda Motor Co., Ltd.Inventors: Yasushi Inagawa, Mitsumasa Furumoto, Hideo Koyama, Yoshiari Takagi
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Publication number: 20050131599Abstract: A hydraulic fluid change indicating device for an automatic transmission includes a first deterioration rate calculating unit; a deterioration acceleration coefficient calculating unit; and a thermal hydraulic fluid deterioration calculating unit for calculating a thermal hydraulic fluid deterioration according to the first deterioration rate and the deterioration acceleration coefficient. The device further includes a second deterioration rate calculating unit according to an engine speed, input shaft speed, and output shaft speed; a mechanical hydraulic fluid deterioration calculating unit for calculating a mechanical fluid deterioration according to the second deterioration rate; and a determining unit for determining whether or not the thermal hydraulic fluid deterioration or the mechanical hydraulic fluid deterioration is greater than a predetermined hydraulic fluid change threshold.Type: ApplicationFiled: December 3, 2004Publication date: June 16, 2005Applicant: HONDA MOTOR CO., LTD.Inventors: Yasushi Inagawa, Mitsumasa Furumoto, Hideo Koyama, Yoshiari Takagi
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Patent number: 6577940Abstract: A shift control apparatus comprises clutches driven by shift solenoids and whether or not the raising of the rotation speed occurs in an internal combustion engine is determined. If the raising of the engine rotation speed is detected, a hydraulic pressure learn correction is made to engagement hydraulic pressure and a time learn correction is made to the hydraulic pressure supply preparation time. The correction ratio of the energization-hydraulic pressure characteristic (I-P characteristic) of clutch clearance and the shift solenoid is set so as to become an appropriate distribution ratio and the learning is started based thereon.Type: GrantFiled: July 11, 2001Date of Patent: June 10, 2003Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Yoshiharu Saito, Yasushi Inagawa, Takanori Kon, Hitoshi Kondou
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Patent number: 6554739Abstract: A system for controlling an automatic transmission of a vehicle, wherein the initial value of the desired pressure to be supplied to a hydraulic clutch for the current gear now being engaged is determined appropriately, when conducting a power-on downshifting, so as to decrease the shift shock experienced by the vehicle occupant effectively, irrespectively of the change in the throttle opening, while ensuring to reduce the volume of the mapped data.Type: GrantFiled: December 8, 2000Date of Patent: April 29, 2003Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Yoshiharu Saito, Yasushi Inagawa, Masamitsu Fukuchi, Shirou Godai, Takanori Kon, Shinya Majikina
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Patent number: 6547698Abstract: A system for controlling an automatic transmission of a vehicle, wherein if the change of the destined gear GB (i.e., the target gear SH) is required when the jumping shift, i.e., two-gear downshifting is in progress, the input/output rotational speed ratio GRATIO (indicative of degree of shift progress) is compared with the predetermined input/output rotational speed ratio #GRCN312 or #GRCN423, and based on the result of comparison, how the shift to establish or effect the required destined gear GB, i.e., the shift mode QATNUM is determined, thereby enabling to improve or enhance the response to the change of the destined gear GB during two-gear downshifting. It can also prevent the clutch from being degraded in such a shifting.Type: GrantFiled: October 23, 2001Date of Patent: April 15, 2003Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Yasushi Inagawa, Satoshi Kato, Masahide Saito, Masamitsu Fukuchi, Yoshikazu Nemoto, Yoshiharu Saito
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Patent number: 6530857Abstract: A system for controlling an automatic transmission of a vehicle, in which a pressure supply time to complete removal of the clutch-stroke play is determined based on the input shaft rotational speed. And a residual oil amount in the clutch is estimated and the time is corrected by the residual oil amount. The preparatory pressure to be supplied within the time is also determined based on the input shaft rotational speed and the ATF temperature. With this, it becomes possible to effect the clutch-stroke play removal within a less variant time and with a good response, thereby decreasing the shift shock effectively so as to improve the feeling of the vehicle occupant.Type: GrantFiled: December 8, 2000Date of Patent: March 11, 2003Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Takanori Kon, Yasushi Inagawa, Yoshiharu Saito, Masamitsu Fukuchi, Shinya Majikina
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Patent number: 6526343Abstract: A system for controlling an automatic transmission of a vehicle, wherein a pressure to be supplied to the hydraulic clutch of a target gear is determined based on a desired value of acceleration of gravity acting in the longitudinal direction of the vehicle and other parameters including an engine torque, thereby decreasing the shift shock effectively, while ensuring to finish the shift within an expected period of time. Moreover, the engine torque is estimated using a parameter indicative of inertia torque used for raising the engine speed. With this, it becomes possible to determine the engine torque inputted to the transmission, thereby decreasing the shift shock more effectively.Type: GrantFiled: December 8, 2000Date of Patent: February 25, 2003Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Yoshiharu Saito, Yasushi Inagawa, Takanori Kon, Masamitsu Fukuchi, Shinya Majikina
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Patent number: 6421597Abstract: A system for controlling an automatic transmission of a vehicle, wherein the hydraulic pressure to be supplied to the frictional engaging element such as a hydraulic clutch is determined, taking the performance of tracking or follow-up of the hydraulic pressure into account so as to enhance the control toughness against the engine speed change, thereby decreasing the shift shock effectively so as to improve the feeling of the vehicle occupant, while ensuring to prevent the engine from revving over or excessively. Further, the friction coefficient of the hydraulic clutch is calculated additionally taking parameters including the rotational difference thereof into account to determine the pressure to be supplied to the frictional engaging element, thereby further decreasing the shift shock effectively.Type: GrantFiled: December 8, 2000Date of Patent: July 16, 2002Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Takanori Kon, Yasushi Inagawa, Yoshiharu Saito, Masamitsu Fukuchi, Shinya Majikina
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Publication number: 20020046617Abstract: A system for controlling an automatic transmission of a vehicle, wherein if the change of the destined gear GB (i.e., the target gear SH) is required when the jumping shift, i.e., two-gear downshifting is in progress, the input/output rotational speed ratio GRATIO (indicative of degree of shift progress) is compared with the predetermined input/output rotational speed ratio #GRCN312 or #GRCN423, and based on the result of comparison, how the shift to establish or effect the required destined gear GB, i.e., the shift mode QATNUM is determined, thereby enabling to improve or enhance the response to the change of the destined gear GB during two-gear downshifting. It can also prevent the clutch from being degraded in such a shifting.Type: ApplicationFiled: October 23, 2001Publication date: April 25, 2002Applicant: HONDA GIKEN KOGYO KABUSHIKI KAISHAInventors: Yasushi Inagawa, Satoshi Kato, Masahide Saito, Masamitsu Fukuchi, Yoshikazu Nemoto, Yoshiharu Saito
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Publication number: 20020022549Abstract: A shift control apparatus comprises clutches driven by shift solenoids and whether or not the raising of the rotation speed occurs in an internal combustion engine is determined. If the raising of the engine rotation speed is detected, a hydraulic pressure learn correction is made to engagement hydraulic pressure and a time learn correction is made to the hydraulic pressure supply preparation time. The correction ratio of the energization-hydraulic pressure characteristic (I-P characteristic) of clutch clearance and the shift solenoid is set so as to become an appropriate distribution ratio and the learning is started based thereon.Type: ApplicationFiled: July 11, 2001Publication date: February 21, 2002Applicant: Honda Giken Kogyo Kabushiki KaishaInventors: Yoshiharu Saito, Yasushi Inagawa, Takanori Kon, Hitoshi Kondou
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Publication number: 20010005705Abstract: A system for controlling an automatic transmission of a vehicle, wherein the hydraulic pressure to be supplied to the frictional engaging element such as a hydraulic clutch is determined, taking the performance of tracking or follow-up of the hydraulic pressure into account so as to enhance the control toughness against the engine speed change, thereby decreasing the shift shock effectively so as to improve the feeling of the vehicle occupant, while ensuring to prevent the engine from revving over or excessively. Further, the friction coefficient of the hydraulic clutch is calculated additionally taking parameters including the rotational difference thereof into account to determine the pressure to be supplied to the frictional engaging element, thereby further decreasing the shift shock effectively.Type: ApplicationFiled: December 8, 2000Publication date: June 28, 2001Applicant: Honda Giken Kogyo Kabushiki KaishaInventors: Takanori Kon, Yasushi Inagawa, Yoshiharu Saito, Masamitsu Fukuchi, Shinya Majikina
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Publication number: 20010003722Abstract: A system for controlling an automatic transmission of a vehicle, wherein the initial value of the desired pressure to be supplied to a hydraulic clutch for the current gear now being engaged is determined appropriately, when conducting a power-on downshifting, so as to decrease the shift shock experienced by the vehicle occupant effectively, irrespectively of the change in he throttle opening, while ensuring to reduce the volume of the mapped data.Type: ApplicationFiled: December 8, 2000Publication date: June 14, 2001Applicant: Honda Giken Kogyo Kabushiki KaishaInventors: Yoshiharu Saito, Yasushi Inagawa, Masamitsu Fukuchi, Shirou Godai, Takanori Kon, Shinya Majikina