Patents by Inventor Masataka Osawa
Masataka Osawa 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).
-
Patent number: 7806790Abstract: A slippage detection system for a continuously variable transmission capable of continuously changing a ratio between a speed of rotation of an input member and a speed of rotation of an output member is provided. The slippage detection system calculates a correlation coefficient relating to the input rotation speed and the output rotation speed, based on a plurality of measurement values of the input rotation speed and a plurality of measurement values of the output rotation speed, and determines slippage of the torque transmitting member in the continuously variable transmission based on the calculated correlation coefficient.Type: GrantFiled: September 30, 2002Date of Patent: October 5, 2010Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kunihiro Iwatsuki, Kazumi Hoshiya, Yasuhiro Oshiumi, Yasunori Nakawaki, Masataka Osawa, Hiroyuki Nishizawa, Hiroyuki Yamaguchi, Hideyuki Suzuki
-
Publication number: 20100197455Abstract: A slippage detection system for a continuously variable transmission capable of continuously changing a gear ratio between an input rotation speed of an input member and an output rotation speed of an output member is provided. The slippage detection system calculate a sum of differences between an actual gear ratio calculated from measurement values of the input rotation speed and the output rotation speed and a target gear ratio over a predetermined period of time, and determines slippage in the continuously variable transmission based on the sum of differences.Type: ApplicationFiled: April 16, 2010Publication date: August 5, 2010Applicant: Toyota Jidosha Kabushiki KaishaInventors: Kunihiro Iwatsuki, Kazumi Hoshiya, Yasuhiro Oshiumi, Yasunori Nakawaki, Hiroyuki Yamaguchi, Hiroyuki Nishizawa, Hideyuki Suzuki, Masataka Osawa
-
Publication number: 20100197454Abstract: A slippage detection system for a continuously variable transmission capable of continuously changing a gear ratio between an input rotation speed of an input member and an output rotation speed of an output member is provided. The slippage detection system compares a difference between an actual gear ratio calculated from measurement values of the input rotation speed and the output rotation speed and a target gear ratio with a predetermined reference value, and determines slippage in the continuously variable transmission when the difference exceeds the reference value at least a predetermined number of times in a predetermined period of time.Type: ApplicationFiled: April 16, 2010Publication date: August 5, 2010Applicant: Toyota Jidosha Kabushiki KaishaInventors: Kunihiro IWATSUKI, Kazumi Hoshiya, Yasuhiro Oshiumi, Yasunori Nakawaki, Hiroyuki Yamaguchi, Hiroyuki Nishizawa, Hideyuki Suzuki, Masataka Osawa
-
Patent number: 7740556Abstract: A hydraulic control apparatus includes two oil flow control valves (30, 32) each provided with a supply control portion (36, 38, 52, 54) for controlling an oil supply from a pressurized oil source, and a discharge control portion (40, 42, 56, 58) for controlling connection with a discharge passage. One of those oil flow control valves supplies/discharges oil to/from one of hydraulic chambers (22, 24) that are oppositely formed in a hydraulic servo mechanism. An operation direction of the hydraulic servo mechanism is performed by operating one of the oil flow control valves. The other operation direction of the hydraulic servo mechanism is performed by operating the other oil flow control valve.Type: GrantFiled: July 16, 2004Date of Patent: June 22, 2010Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yuji Iwase, Masami Sugaya, Hiroyuki Nishizawa, Kisaburo Hayakawa, Masataka Osawa
-
Patent number: 7637836Abstract: In a power transmission system for transmitting power of an engine to a load, a planetary gear mechanism provided in parallel to a speed variator combines torque conveyed from the engine with torque conveyed from a motor generator in a state such that their torque ratio equals a predetermined ratio, and transmits the combined torque to a driven wheel. When performing power transmission between the engine and the driven wheel via both the speed variator and the planetary gear mechanism, power distribution between the power conveyed to the speed variator and the power conveyed to the planetary gear mechanism can be actively controlled by adjusting the torque of the motor generator. As a result, the speed variator capacity can be reduced while enhancing power transmission efficiency.Type: GrantFiled: April 26, 2006Date of Patent: December 29, 2009Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Takao Watanabe, Hiroyuki Nishizawa, Masataka Osawa
-
Patent number: 7503869Abstract: A controller determines a target gear ratio from an accelerator opening and a vehicle speed. The controller determines the stroke of a trunnion on the basis of the difference between present inclination and a target inclination, thereby to control stroke by a hydraulic control valve. The stroke is corrected according to input/output disc pushing force.Type: GrantFiled: November 12, 2004Date of Patent: March 17, 2009Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hiroyuki Nishizawa, Kisaburo Hayakawa, Shuzo Sanda, Masanobu Kimura, Masataka Osawa, Yuji Iwase, Naoto Tanaka, Naoki Moriguchi, Masami Sugaya
-
Patent number: 7294075Abstract: A belt clamping pressure setting device includes: a belt clamping pressure setting unit that sets a belt clamping pressure of a continuously variable transmission that includes an input-side pulley, an output-side pulley, and a belt running between the input-side pulley and the out-side pulley; an input revolution detection sensor that detects a number of input revolutions of the input-side pulley; an output revolution detection sensor that detects a number of output revolutions of the output-side pulley; an input torque detection unit that detects an input torque to the input-side pulley; a reference clamping pressure computing unit that computes a reference clamping pressure, based on the number of input revolutions detected by the input revolution detection sensor, the number of output revolutions detected by the output revolution detection sensor, and the input torque detected by the input torque detection unit; and a belt clamping pressure computing unit that computes the belt clamping pressure to be setType: GrantFiled: May 26, 2004Date of Patent: November 13, 2007Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hiroyuki Yamaguchi, Hiroyuki Nishizawa, Hideyuki Suzuki, Masataka Osawa, Kunihiro Iwatsuki
-
Patent number: 7169079Abstract: A control apparatus and method control a torque of an engine coupled to an input shaft of an automatic transmission during a shift by that automatic transmission. A torque-down control by which the engine torque is decreased by a predetermined amount is performed, a torque-restore control starting point at which time torque-restore control is to be started is determined, and the torque-restore control so as to gradually restore the engine torque to a value before the torque-down control was performed is started at the torque-restore control starting point. The torque-restore control starting point is determined according to a dynamic model which simulates behavior of the automatic transmission over time from start of the torque-down control, so that a rotational speed of the input shaft of the automatic transmission at a target point substantially matches a target speed.Type: GrantFiled: September 23, 2003Date of Patent: January 30, 2007Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takaaki Tokura, Norimi Asahara, Katsumi Kono, Ryoichi Hibino, Hiroyuki Nishizawa, Masataka Osawa
-
Patent number: 7159506Abstract: The load element state detecting portion 72 detects the completion of the filling of the hydraulic oil into the clutch 62 and the working limit of the accumulator 64 on the basis of the displacement of the spool valve element 42. That is, since the completion of the filling of the hydraulic oil into the clutch and the working limit of the accumulator 64 are directly detected, so that the completion of the filling of the hydraulic oil into the clutch 62 and the working limit of the accumulator 64 can be detected with high precision regardless of differences among products and the time-lapse variation. Furthermore, they can be detected without equipping any special device to the hydraulic control circuit, and thus there is an advantage that the device construction is simple.Type: GrantFiled: June 25, 2004Date of Patent: January 9, 2007Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takaaki Tokura, Katsumi Kono, Tomohiro Asami, Nobufusa Kobayashi, Hideki Takamatsu, Norimi Asahara, Shu Asami, Ryoichi Hibino, Hiroyuki Nishizawa, Masataka Osawa
-
Publication number: 20060247086Abstract: In a power transmission system for transmitting power of an engine to a load, a planetary gear mechanism provided in parallel to a speed variator combines torque conveyed from the engine with torque conveyed from a motor generator in a state such that their torque ratio equals a predetermined ratio, and transmits the combined torque to a driven wheel. When performing power transmission between the engine and the driven wheel via both the speed variator and the planetary gear mechanism, power distribution between the power conveyed to the speed variator and the power conveyed to the planetary gear mechanism can be actively controlled by adjusting the torque of the motor generator. As a result, the speed variator capacity can be reduced while enhancing power transmission efficiency.Type: ApplicationFiled: April 26, 2006Publication date: November 2, 2006Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Takao Watanabe, Hiroyuki Nishizawa, Masataka Osawa
-
Publication number: 20060183581Abstract: A slippage detection system for a continuously variable transmission capable of continuously changing a ratio between a speed of rotation of an input member and a speed of rotation of an output member is provided. The slippage detection system calculates a correlation coefficient relating to the input rotation speed and the output rotation speed, based on a plurality of measurement values of the input rotation speed and a plurality of measurement values of the output rotation speed, and determines slippage of the torque transmitting member in the continuously variable transmission based on the calculated correlation coefficient.Type: ApplicationFiled: September 30, 2002Publication date: August 17, 2006Inventors: Kunihiro Iwatsuki, Kazumi Hoshiya, Yasuhiro Oshiumi, Yasuhiro Oshiumi, Hiroyuki Yamaguchi, Hiroyuki Nishizawa, Hideyuki Suzuki, Masataka Osawa
-
Publication number: 20060174757Abstract: A hydraulic control apparatus includes two oil flow control valves (30, 32) each provided with a supply control portion (36, 38, 52, 54) for controlling an oil supply from a pressurized oil source, and a discharge control portion (40, 42, 56, 58) for controlling connection with a discharge passage. One of those oil flow control valves supplies/discharges oil to/from one of hydraulic chambers (22, 24) that are oppositely formed in a hydraulic servo mechanism. An operation direction of the hydraulic servo mechanism is performed by operating one of the oil flow control valves. The other operation direction of the hydraulic servo mechansim is performed by operating the other oil flow control valve.Type: ApplicationFiled: July 16, 2004Publication date: August 10, 2006Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuji Iwase, Masami Sugaya, Hiroyuki Nishizawa, Kisaburo Hayakawa, Masataka Osawa
-
Patent number: 7059997Abstract: An engine system includes an engine, continuously variable transmission and a controller. The engine has an engine shaft and plural cylinders. A number of activated cylinders among the plural cylinders is variable. The continuously variable transmission is configured to transmit a rotation of the engine shaft to wheels of a vehicle at a transmission ratio which is continuously variable. The controller is configured to control the engine to change the number of activated cylinders keeping an engine power generated by the engine to be substantially constant.Type: GrantFiled: August 4, 2004Date of Patent: June 13, 2006Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Hiroyuki Nishizawa, Masataka Osawa
-
Patent number: 7032468Abstract: The vehicle weight determination device includes a microcomputer for achieving the vehicle weight determination by obtaining a driving force after filtering based on the speed ratio of the torque converter and obtaining an integrated driving force with the absolute value of the driving force after filtering by using an area method. Similarly, acceleration after filtering is obtained by filtering process of the acceleration and an integrated to obtain an integrated acceleration. The vehicle weight is determined by the integrated driving force divided by the integrated acceleration.Type: GrantFiled: May 21, 2002Date of Patent: April 25, 2006Assignee: Aisin Seiki Kabushiki KaishaInventors: Naoki Yamada, Toshiaki Ishiguro, Hiroaki Kato, Kisaburo Hayakawa, Masataka Osawa, Ryoichi Hibino
-
Publication number: 20060079361Abstract: The first element has a first thickness. The second element has a second thickness that is smaller than the first thickness, and the number of second elements is approximately equal to that of the first elements. Both the first and second elements are supported by the hoop so as to stack in the thickness direction according to a maximum length sequence.Type: ApplicationFiled: October 12, 2005Publication date: April 13, 2006Applicants: Toyota Jidosha Kabushiki Kaisha, Aisin AW Co., Ltd.Inventors: Yasushi Ueda, Ichiro Aoto, Yuji Suzuki, Ryoichi Hibino, Masataka Osawa, Masashi Hattori, Katsumori Fujii, Ryo Nakamura
-
Patent number: 6984189Abstract: A friction transmission unit for transmitting power between input and output members by means of friction and capable of loss reduction and large torque transmission. Power is transmitted between a planar disk (16) and a roller (10), which contacts the upper surface of the planar disk (16). The profile of the peripheral surface (14) of the roller (10) which actually contacts the upper surface (20) of the disk (16) is expressed as z=a·sin h(bx2). This profile realizes a contact stress distribution which is constant over an area corresponding to approximately 80% in the width direction of the entire contact region. This profile also prevents formation of peak stresses near and at the edges of the contact region and, instead, enables formation of monotonic decrease of stress in areas near the edges.Type: GrantFiled: February 8, 2002Date of Patent: January 10, 2006Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Tomohiro Suzuki, Shuzo Sanda, Takanori Abekura, Kazuyoshi Ogawa, Masataka Osawa, Masakatsu Kuroishi, Toshinari Sano
-
Publication number: 20050124454Abstract: A controller determines a target gear ratio from an accelerator opening and a vehicle speed. The controller determines the stroke of a trunnion on the basis of the difference between present inclination and a target inclination, thereby to control stroke by a hydraulic control valve. The stroke is corrected according to input/output disc pushing force.Type: ApplicationFiled: November 12, 2004Publication date: June 9, 2005Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroyuki Nishizawa, Kisaburo Hayakawa, Shuzo Sanda, Masanobu Kimura, Masataka Osawa, Yuji Iwase, Naoto Tanaka, Naoki Moriguchi, Masami Sugaya
-
Patent number: 6866612Abstract: In order to control slip amount of a disengagement side engagement device at the time of a gear shift operation, a target value Nr for rotational speed of an input shaft of an automatic transmission is calculated inside an input shaft speed target value calculating block. Slip control of the disengagement side engagement device is then carried out by controlling engine torque using an engine torque control amount obtained from a engine torque control amount estimation block and the clutch slip amount compensation value calculating section to cause rotation speed Nt of the input shaft to follow the target value Nr. In this way, responsiveness and precision of slip control of the disengagement side engagement device at the time of gear shift operation are improved, and it is possible to improve gear shift shock and to carry out a gear shift operation in a short period of time.Type: GrantFiled: December 16, 2002Date of Patent: March 15, 2005Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takaaki Tokura, Katsumi Kono, Norimi Asahara, Masataka Osawa, Hiroyuki Nishizawa, Ryoichi Hibino
-
Publication number: 20050049108Abstract: An engine system includes an engine, continuously variable transmission and a controller. The engine has an engine shaft and plural cylinders. A number of activated cylinders among the plural cylinders is variable. The continuously variable transmission is configured to transmit a rotation of the engine shaft to wheels of a vehicle at a transmission ratio which is continuously variable. The controller is configured to control the engine to change the number of activated cylinders keeping an engine power generated by the engine to be substantially constant.Type: ApplicationFiled: August 4, 2004Publication date: March 3, 2005Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Hiroyuki Nishizawa, Masataka Osawa
-
Publication number: 20050000305Abstract: The vehicle weight determination device includes a microcomputer for achieving the vehicle weight determination by obtaining a driving force after filtering based on the speed ratio of the torque converter and obtaining an integrated driving force with the absolute value of the driving force after filtering by using an area method. Similarly, acceleration after filtering is obtained by filtering process of the acceleration and an integrated to obtain an integrated acceleration. The vehicle weight is determined by the integrated driving force divided by the integrated acceleration.Type: ApplicationFiled: May 21, 2002Publication date: January 6, 2005Inventors: Naoki Yamada, Toshiaki Ishiguro, Hiroaki Kato, Kisaburo Hayakawa, Masataka Osawa, Ryoichi Hibino