Patents by Inventor Takeji Katakura
Takeji Katakura 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: 7025707Abstract: A multistage automatic transmission comprises first and second clutches and a throttle open degree sensor. The first and second clutches are arranged to establish odd and even speeds of the transmission when engaged. A control unit of the transmission is configured to carry out determining a desired speed of the transmission upon receiving information signals; causing at least one the first and second clutches to be engaged to establish the desired speed; and applying a limitation to an engaging force produced by at least one of the first and second clutches when the throttle open degree sensor senses that the open degree of a throttle valve is smaller than a predetermined degree.Type: GrantFiled: April 8, 2004Date of Patent: April 11, 2006Assignee: Nissan Motor Co., Ltd.Inventor: Takeji Katakura
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Patent number: 6978691Abstract: A shift control apparatus for an automated twin clutch transmission includes a shifting movement detecting device operable to detect start of shifting movement of a shift instructing device and output a shift starting instruction, and a shift controller configured to perform, in response to the shift starting instruction, a pre-shift control by releasing one of the first and second engine clutches from a power transmission route of a pre-shift gear ratio and engaging one of the shift clutches corresponding to a post-shift gear ratio, and perform, in response to a shift instruction form a shift instruction outputting device, a gearshift by releasing the other of the first and second engine clutches from the power transmission route of the pre-shift gear ratio and engaging the above-mentioned one of the first and second engine clutches. A shift control method is also provided.Type: GrantFiled: March 19, 2004Date of Patent: December 27, 2005Assignee: Nissan Motor Co., Ltd.Inventor: Takeji Katakura
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Patent number: 6949051Abstract: A device is provided that issues a vehicle speed signal representative of a vehicle speed. A control unit is configured to carry out when, upon the transmission assuming the second speed, the vehicle speed represented by the vehicle speed signal becomes equal to or lower than a first predetermined speed, starting operation for fully releasing the engaged condition of the first clutch; when thereafter the vehicle speed becomes equal to or lower than a second predetermined speed that is lower than the first predetermined speed, starting operation for releasing the engaged condition of the second clutch; and when thereafter the vehicle speed becomes equal to or lower than a third predetermined speed that is lower than the second predetermined speed, starting operation for fully releasing the engaged condition of the second clutch and starting operation for engaging the first clutch from the fully released condition of the same.Type: GrantFiled: February 2, 2004Date of Patent: September 27, 2005Assignee: Nissan Motor Co., Ltd.Inventor: Takeji Katakura
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Patent number: 6881169Abstract: A transmission with an automatic clutch is arranged to execute a shift operation by disconnecting a transmission input shaft from an output shaft of a power source and operating one of coupling sleeves so as to establish a desired transmission ratio. The transmission is comprised of a bypass driveline. During this shift operation, the bypass driveline becomes operative and transmits a power of the power source to a transmission input shaft while bypassing the automatic clutch.Type: GrantFiled: September 19, 2002Date of Patent: April 19, 2005Assignee: Nissan Motor Co., Ltd.Inventor: Takeji Katakura
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Publication number: 20040204288Abstract: A multistage automatic transmission comprises first and second clutches and a throttle open degree sensor. The first and second clutches are arranged to establish odd and even speeds of the transmission when engaged. A control unit of the transmission is configured to carry out determining a desired speed of the transmission upon receiving information signals; causing at least one the first and second clutches to be engaged to establish the desired speed; and applying a limitation to an engaging force produced by at least one of the first and second clutches when the throttle open degree sensor senses that the open degree of a throttle valve is smaller than a predetermined degree.Type: ApplicationFiled: April 8, 2004Publication date: October 14, 2004Applicant: NISSAN MOTOR CO., LTD.Inventor: Takeji Katakura
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Publication number: 20040182187Abstract: A shift control apparatus for an automated twin clutch transmission includes a shifting movement detecting device operable to detect start of shifting movement of a shift instructing device and output a shift starting instruction, and a shift controller configured to perform, in response to the shift starting instruction, a pre-shift control by releasing one of the first and second engine clutches from a power transmission route of a pre-shift gear ratio and engaging one of the shift clutches corresponding to a post-shift gear ratio, and perform, in response to a shift instruction form a shift instruction outputting device, a gearshift by releasing the other of the first and second engine clutches from the power transmission route of the pre-shift gear ratio and engaging the above-mentioned one of the first and second engine clutches. A shift control method is also provided.Type: ApplicationFiled: March 19, 2004Publication date: September 23, 2004Applicant: NISSAN MOTOR CO., LTD.Inventor: Takeji Katakura
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Publication number: 20040154420Abstract: A device is provided that issues a vehicle speed signal representative of a vehicle speed. A control unit is configured to carry out when, upon the transmission assuming the second speed, the vehicle speed represented by the vehicle speed signal becomes equal to or lower than a first predetermined speed, starting operation for fully releasing the engaged condition of the first clutch; when thereafter the vehicle speed becomes equal to or lower than a second predetermined speed that is lower than the first predetermined speed, starting operation for releasing the engaged condition of the second clutch; and when thereafter the vehicle speed becomes equal to or lower than a third predetermined speed that is lower than the second predetermined speed, starting operation for fully releasing the engaged condition of the second clutch and starting operation for engaging the first clutch from the fully released condition of the same.Type: ApplicationFiled: February 2, 2004Publication date: August 12, 2004Applicant: NISSAN MOTOR CO., LTD.Inventor: Takeji Katakura
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Publication number: 20030056612Abstract: A transmission with an automatic clutch is arranged to execute a shift operation by disconnecting a transmission input shaft from an output shaft of a power source and operating one of coupling sleeves so as to establish a desired transmission ratio. The transmission is comprised of a bypass driveline. During this shift operation, the bypass driveline becomes operative and transmits a power of the power source to a transmission input shaft while bypassing the automatic clutch.Type: ApplicationFiled: September 19, 2002Publication date: March 27, 2003Applicant: NISSAN MOTOR CO., LTD.Inventor: Takeji Katakura