Patents by Inventor Ryouhei Shigeta
Ryouhei Shigeta 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: 8229640Abstract: When determining that a vehicle is not skidding, the ECU carries out tight corner control if vehicle speed is smaller than the upper limit value of the vehicle speed range corresponding to the starting state of the vehicle and the steering wheel turning angle of a steering wheel is greater than or equal to the minimum value of the steering wheel turning angle at which the tight corner braking phenomenon may occur. When determining that the vehicle is skidding, the ECU inhibits the tight corner control even if the vehicle speed is smaller than the upper limit value and the steering wheel turning angle is greater than or equal to the minimum value of the steering wheel turning angle at which the tight corner braking phenomenon may occur.Type: GrantFiled: March 23, 2009Date of Patent: July 24, 2012Assignee: JTEKT CorporationInventors: Ryouhei Shigeta, Akihiro Ohno, Hiroyuki Ando, Masaki Mita, Tomohiro Nozu
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Publication number: 20090248268Abstract: When determining that a vehicle is not skidding, the ECU carries out tight corner control if vehicle speed is smaller than the upper limit value of the vehicle speed range corresponding to the starting state of the vehicle and the steering wheel turning angle of a steering wheel is greater than or equal to the minimum value of the steering wheel turning angle at which the tight corner braking phenomenon may occur. When determining that the vehicle is skidding, the ECU inhibits the tight corner control even if the vehicle speed is smaller than the upper limit value and the steering wheel turning angle is greater than or equal to the minimum value of the steering wheel turning angle at which the tight corner braking phenomenon may occur.Type: ApplicationFiled: March 23, 2009Publication date: October 1, 2009Applicant: JTEKT CorporationInventors: Ryouhei SHIGETA, Akihiro Ohno, Hiroyuki Ando, Masaki Mita, Tomohiro Nozu
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Patent number: 7581612Abstract: An IG-off-timer measures the time t_off from when an engine is stopped, or an ignition is turned off. An ECU sequentially memorizes an estimated temperature of each of heat generating portions as a memorized temperature. Immediately after the engine is re-started, the ECU sets an initial value of the estimated temperature of each heat generating portion in such a manner that the initial value reflects a temperature drop of the heat generating portion in the deactivation period of the engine. The temperature of the heat generating portion is thus accurately estimated even after re-starting of the engine. The heat generating portions are thus appropriately protected.Type: GrantFiled: August 1, 2006Date of Patent: September 1, 2009Assignees: JTEKT Corporation, Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Ryouhei Shigeta, Tomoaki Kato, Akihiro Ohno, Tsuyoshi Murakami, Yasushi Yamada, Tadashi Yoshioka, Shunzo Tanaka
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Patent number: 7553257Abstract: An ECU estimates the temperatures of the heat generating portions provided in a drive force transmission system, or a transaxle, a rear differential, and a torque coupling, in correspondence with not only the rotational speed (the differential rotational speed) of each heat generating portion and the torque transmission rate of the torque coupling but also the outside temperature detected by an outside temperature sensor. If the estimated temperature of any of the heat generating portions exceeds a respective predetermined temperature, the ECU controls operation of the torque coupling to suppress overheating of the heat generating portion. That is, the temperature of each heat generating portion is accurately detected through a simplified structure and overheating of the heat generating portion is effectively suppressed.Type: GrantFiled: August 1, 2006Date of Patent: June 30, 2009Assignees: Jtekt Corporation, Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Ryouhei Shigeta, Tomoaki Kato, Akihiro Ohno, Tsuyoshi Murakami, Tadashi Yoshioka, Shunzo Tanaka
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Patent number: 7487028Abstract: A power distribution control device 42 calculates a low-? information magnitude, associated with the friction coefficient of the road surface, based on the slip rate and the vehicle acceleration operation magnitude. If the low-? information magnitude exceeds an addition evaluation threshold, the power distribution control device 42 adds the low-? information magnitude. If the low-? information magnitude does not exceed the addition evaluation threshold, the power distribution control device 42 subtracts a constant K from a counter. The power distribution control device 42 makes evaluates a road to have a low-? when the counter exceeds a low-? evaluation threshold.Type: GrantFiled: May 13, 2004Date of Patent: February 3, 2009Assignee: JTEKT CorporationInventors: Ryouhei Shigeta, Tsuyoshi Murakami
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Publication number: 20070029126Abstract: An IG-off-timer measures the time t_off from when an engine is stopped, or an ignition is turned off. An ECU sequentially memorizes an estimated temperature of each of heat generating portions as a memorized temperature. Immediately after the engine is re-started, the ECU sets an initial value of the estimated temperature of each heat generating portion in such a manner that the initial value reflects a temperature drop of the heat generating portion in the deactivation period of the engine. The temperature of the heat generating portion is thus accurately estimated even after re-starting of the engine. The heat generating portions are thus appropriately protected.Type: ApplicationFiled: August 1, 2006Publication date: February 8, 2007Applicants: JTEKT Corporation, MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHAInventors: Ryouhei Shigeta, Tomoaki Kato, Akihiro Ohno, Tsuyoshi Murakami, Yasushi Yamada, Tadashi Yoshioka, Shunzo Tanaka
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Publication number: 20070032339Abstract: An ECU estimates the temperatures of the heat generating portions provided in a drive force transmission system, or a transaxle, a rear differential, and a torque coupling, in correspondence with not only the rotational speed (the differential rotational speed) of each heat generating portion and the torque transmission rate of the torque coupling but also the outside temperature detected by an outside temperature sensor. If the estimated temperature of any of the heat generating portions exceeds a respective predetermined temperature, the ECU controls operation of the torque coupling to suppress overheating of the heat generating portion. That is, the temperature of each heat generating portion is accurately detected through a simplified structure and overheating of the heat generating portion is effectively suppressed.Type: ApplicationFiled: August 1, 2006Publication date: February 8, 2007Applicants: JTEKT Corporation, MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHAInventors: Ryouhei Shigeta, Tomoaki Kato, Akihiro Ohno, Tsuyoshi Murakami, Tadashi Yoshioka, Shunzo Tanaka
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Patent number: 7048084Abstract: A CPU computes a throttle opening degree increasing speed V?h and a steering wheel angular velocity V? based on a throttle opening degree ?h and a steering wheel angle ?. Based on the throttle increasing speed V?h and the steering wheel angular velocity V?, the CPU selects one of a first drive mode and a second drive mode. The CPU controls the power transmission ratio of a power transmitting device according to the selected drive mode. Therefore, the power transmission ratio of the power transmitting device is properly controlled in accordance with the degree of intention for acceleration of the driver, which is computed based on the throttle increasing speed V?h, and the turning speed of the steering wheel, which is computed based on the steering wheel angular velocity V?. Therefore, the drive mode is properly switched in accordance with the driving state of a four-wheel drive vehicle.Type: GrantFiled: July 8, 2004Date of Patent: May 23, 2006Assignee: Toyoda Koki Kabushiki KaishaInventors: Ryouhei Shigeta, Tsuyoshi Murakami, Hisao Fumoto, Yutaka Hirokane
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Publication number: 20050029035Abstract: A CPU computes a throttle opening degree increasing speed V?h and a steering wheel angular velocity V? based on a throttle opening degree ?h and a steering wheel angle ?. Based on the throttle increasing speed V?h and the steering wheel angular velocity V?, the CPU selects one of a first drive mode and a second drive mode. The CPU controls the power transmission ratio of a power transmitting device according to the selected drive mode. Therefore, the power transmission ratio of the power transmitting device is properly controlled in accordance with the degree of intention for acceleration of the driver, which is computed based on the throttle increasing speed V?h, and the turning speed of the steering wheel, which is computed based on the steering wheel angular velocity V?. Therefore, the drive mode is properly switched in accordance with the driving state of a four-wheel drive vehicle.Type: ApplicationFiled: July 8, 2004Publication date: February 10, 2005Applicant: TOYODA KOKI KABUSHIKI KAISHAInventors: Ryouhei Shigeta, Tsuyoshi Murakami, Hisao Fumoto, Yutaka Hirokane
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Publication number: 20050004741Abstract: A power distribution control device 42 calculates a low-? information magnitude, associated with the friction coefficient of the road surface, based on the slip rate and the vehicle acceleration operation magnitude. If the low-? information magnitude exceeds an addition evaluation threshold, the power distribution control device 42 adds the low-? information magnitude. If the low-? information magnitude does not exceed the addition evaluation threshold, the power distribution control device 42 subtracts a constant K from a counter. The power distribution control device 42 makes evaluates a road to have a low-? when the counter exceeds a low-? evaluation threshold.Type: ApplicationFiled: May 13, 2004Publication date: January 6, 2005Applicant: Toyoda Koki Kabushiki KaishaInventors: Ryouhei Shigeta, Tsuyoshi Murakami
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Patent number: 6823252Abstract: A four-wheel drive vehicle is provided with a drive power transmission device for controlling the connection degree of a front wheel axle driven by an engine with a rear wheel axle. A drive power distribution control device is responsive to a vehicle speed, a rotational difference between front wheels driven by the front wheel axle and rear wheels driven by the rear wheel axle, a throttle opening degree signal and the like and controls the drive power transmission device. The drive power distribution control device judges whether the vehicle is beginning to start or not and at the starting of the vehicle, controls the transmission rate of the drive power transmission device in dependence on the state or manner in which the vehicle is beginning to start.Type: GrantFiled: June 19, 2003Date of Patent: November 23, 2004Assignee: Toyoda Koki Kabushiki KaishaInventors: Isao Ito, Tsuyoshi Murakami, Ryouhei Shigeta, Hisaaki Wakao, Yasushi Yamada
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Patent number: 6752742Abstract: A vehicle has a transmission apparatus that changes the distribution of power transmitted from a power source to a plurality of wheels. The method for distributing power of the vehicle includes detecting the temperature of a part located on a power transmission path between the power source and a wheel to which power is transmitted from the power source through the transmission apparatus, the heat of the part being increased as the power distribution ratio is increased; determining that the current state is a specific state in which the detected temperature reaches a previously set first reference temperature; and controlling the transmission apparatus to lower the power distribution ratio to the wheel from the transmission apparatus when the current state is determined to the specified state.Type: GrantFiled: October 31, 2002Date of Patent: June 22, 2004Assignees: Toyoda Koki Kabushiki Kaisha, Mazda Motor CorporationInventors: Ryouhei Shigeta, Tsuyoshi Murakami, Hideshi Hiruta, Hisao Fumoto, Masashi Oda
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Publication number: 20040035622Abstract: A four-wheel drive vehicle is provided with a drive power transmission device for controlling the connection degree of a front wheel axle driven by an engine with a rear wheel axle. A drive power distribution control device is responsive to a vehicle speed, a rotational difference between front wheels driven by the front wheel axle and rear wheels driven by the rear wheel axle, a throttle opening degree signal and the like and controls the drive power transmission device. The drive power distribution control device includes a vehicle starting judgment means for judging whether the vehicle is beginning to start or not and at the starting of the vehicle, controls the transmission rate of the drive power transmission device in dependence on the state or manner in which the vehicle is beginning to start.Type: ApplicationFiled: June 19, 2003Publication date: February 26, 2004Applicant: TOYODA KOKI KABUSHIKI KAISHAInventors: Isao Ito, Tsuyoshi Murakami, Ryouhei Shigeta, Hisaaki Wakao, Yasushi Yamada
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Publication number: 20030109356Abstract: A vehicle has a transmission apparatus that changes the distribution of power transmitted from a power source to a plurality of wheels. The method for distributing power of the vehicle includes detecting the temperature of a part located on a power transmission path between the power source and a wheel to which power is transmitted from the power source through the transmission apparatus, the heat of the part being increased as the power distribution ratio is increased; determining that the current state is a specific state in which the detected temperature reaches a previously set first reference temperature; and controlling the transmission apparatus to lower the power distribution ratio to the wheel from the transmission apparatus when the current state is determined to the specified state.Type: ApplicationFiled: October 31, 2002Publication date: June 12, 2003Applicants: TOYODA KOKI KABUSHIKI KAISHA, MAZDA MOTOR CORPORATIONInventors: Ryouhei Shigeta, Tsuyoshi Murakami, Hideshi Hiruta, Hisao Fumoto, Masashi Oda