Patents by Inventor Tomoyasu Kada
Tomoyasu Kada 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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Publication number: 20180037254Abstract: A vehicle steering system includes a clutch provided on a power transmission path extending from a steering wheel to steered wheels, a reactive-force motor connected to a first portion of the power transmission path, which is closer to the steering wheel than the clutch is, a steering motor including a first motor coil and a second motor coil, and connected to a second portion of the power transmission path, which is closer to the steered wheels than the clutch is, a driving circuit configured to supply electric power to the reactive-force motor, a first driving circuit configured to supply electric power to the first motor coil, and a second driving circuit configured to supply electric power to the second motor coil.Type: ApplicationFiled: July 27, 2017Publication date: February 8, 2018Applicant: JTEKT CORPORATIONInventors: Keisuke IZUTANI, Masahiko SAKAMAKI, Hiroaki KAJI, Tomonari YAMAKAWA, Atsuo SAKAI, Tomoyasu KADA
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Patent number: 9448137Abstract: A test system includes an actual machine including a test piece that is a mechanical element of a vehicle, the actual machine being installed in a first location; a control device that is installed in the first location, and controls the actual machine; a model installed in a second location away from the first location; and a data processor that is installed in the second location, and is connected to the actual machine or the control device via a communication line so that data communication is performed, the data processor acquiring data from the actual machine via the communication line so that an operation test is performed. The data processor calculates a target value for controlling the actual machine based on an output acquired by inputting the acquired data to the model, and the control device controls the actual machine based on the target value.Type: GrantFiled: March 24, 2014Date of Patent: September 20, 2016Assignee: JTEKT CORPORATIONInventors: Hiroshi Yoshimoto, Tomoyasu Kada, Ryouhei Hayama, Masaharu Tagami, Aris Maroonian
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Patent number: 9442043Abstract: A vehicle test apparatus includes: a test article installation vehicle body to which four axles corresponding to four wheels that are a left front wheel, a right front wheel, a left rear wheel and a right rear wheel are attached, and on which a test article is installed; a first motion base that supports the test article installation vehicle body, and that allows the test article installation vehicle body to make motions of six degrees of freedom; and four second motion bases each of which supports a corresponding one of the axles, and each of which allows a corresponding one of the axles to make motions of six degrees of freedom.Type: GrantFiled: April 18, 2014Date of Patent: September 13, 2016Assignee: JTEKT CORPORATIONInventors: Masaharu Tagami, Tomoyasu Kada, Ryouhei Hayama, Takeshi Watanabe, Aris Maroonian
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Publication number: 20140318264Abstract: A vehicle test apparatus includes: a test article installation vehicle body to which four axles corresponding to four wheels that are a left front wheel, a right front wheel, a left rear wheel and a right rear wheel are attached, and on which a test article is installed; a first motion base that supports the test article installation vehicle body, and that allows the test article installation vehicle body to make motions of six degrees of freedom; and four second motion bases each of which supports a corresponding one of the axles, and each of which allows a corresponding one of the axles to make motions of six degrees of freedom.Type: ApplicationFiled: April 18, 2014Publication date: October 30, 2014Applicant: JTEKT CORPORATIONInventors: Masaharu TAGAMI, Tomoyasu KADA, Ryouhei HAYAMA, Takeshi WATANABE, Aris MAROONIAN
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Publication number: 20140297098Abstract: A test system includes an actual machine including a test piece that is a mechanical element of a vehicle, the actual machine being installed in a first location; a control device that is installed in the first location, and controls the actual machine; a model installed in a second location away from the first location; and a data processor that is installed in the second location, and is connected to the actual machine or the control device via a communication line so that data communication is performed, the data processor acquiring data from the actual machine via the communication line so that an operation test is performed. The data processor calculates a target value for controlling the actual machine based on an output acquired by inputting the acquired data to the model, and the control device controls the actual machine based on the target value.Type: ApplicationFiled: March 24, 2014Publication date: October 2, 2014Applicant: JTEKT CORPORATIONInventors: Hiroshi YOSHIMOTO, Tomoyasu KADA, Ryouhei HAYAMA, Masaharu TAGAMI, Aris MAROONIAN
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Patent number: 8744687Abstract: A vehicle steering apparatus in which a mechanical coupling between a steering member and steered wheels is uncoupled, includes a steering actuator for driving a steered mechanism and a control unit for drive-controlling the steering actuator. The control unit reduces steering-stiffness using a PID control portion for drive-controlling the steering actuator according to a deviation between a target steered angle and a steered-angle detected by the steered angle sensor. A gain setting portion sets gains of the PID control portion to be relatively low when a predetermined condition is satisfied.Type: GrantFiled: June 12, 2012Date of Patent: June 3, 2014Assignee: Jtekt CorporationInventors: Ryouhei Hayama, Tomoyasu Kada, Shingo Maeda, Shuuji Kimura
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Patent number: 8660749Abstract: A motor vehicle steering system steers vehicle wheels in response to the operation of an operation member for steering a vehicle. The system includes a rutted road judging unit which judges whether the vehicle is driving on a rutted road or not, and a steering enhancement control unit which enhances steering of vehicle wheels in response to operation of the operation member when the rutted road judging unit judges that the vehicle is driving on a rutted road than when the rutted road judging unit judges that the vehicle is not driving on a rutted road.Type: GrantFiled: May 4, 2007Date of Patent: February 25, 2014Assignee: JTEKT CorporationInventors: Ryouhei Hayama, Shiro Nakano, Tomoyasu Kada
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Publication number: 20120253603Abstract: A vehicle steering apparatus in which a mechanical coupling between a steering member and steered wheels is uncoupled, includes a steering actuator for driving a steered mechanism and a control unit for drive-controlling the steering actuator. The control unit reduces steering-stiffness using a PID control portion for drive-controlling the steering actuator according to a deviation between a target steered angle and a steered-angle detected by the steered angle sensor. A gain setting portion sets gains of the PID control portion to be relatively low when a predetermined condition is satisfied.Type: ApplicationFiled: June 12, 2012Publication date: October 4, 2012Applicant: JTEKT CORPORATIONInventors: Ryouhei HAYAMA, Tomoyasu Kada, Shingo Maeda, Shuuji Kimura
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Patent number: 8224528Abstract: A steered shaft of a steered mechanism is rigidly fixed to a vehicle body. Steering-stiffness is reduced by a lowpass filter for filtering a steered angle detected by a steered angle sensor. A deviation between a target steered angle and the filtered steered angle detected by the steered angle sensor is input to a PID control unit. A gain setting unit sets each of gains for PID control at a low value to thereby reduce steering-stiffness. The PID control unit outputs a target current. A drive circuit performs, e.g., PID control of the steering actuator.Type: GrantFiled: April 1, 2008Date of Patent: July 17, 2012Assignee: JTEKT CorporationInventors: Ryouhei Hayama, Tomoyasu Kada, Shingo Maeda, Shuuji Kimura
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Patent number: 8177019Abstract: It is one object of the present invention to provide a steering device for a vehicle improving a resolution of detecting a steering reaction force thereby to control precisely a reaction actuator and to improve a steering feeling. The steering device for the vehicle is equipped with a reaction actuator 19 acting a steering reaction force on a steering wheel 1. This device further includes a steering angle sensor 11 detecting a steering angle ?h of the steering wheel 1, a controller 20 controlling the reaction actuator 19 according to the steering angle ?h, a torque sensor 12 detecting a steering torque Th acted on the steering wheel 1. The controller 20 controls in a feedback way the reaction actuator 11 based on the steering torque Th in a predetermined range including a middle point of the steering angle. The controller 20 drives, in a open-loop way without feed-backing the steering torque Th, the reaction actuator 19 out of the predetermined range of the steering angle ?h.Type: GrantFiled: December 26, 2007Date of Patent: May 15, 2012Assignee: Jtekt CorporationInventors: Shoji Koyama, Ryohei Hayama, Tomoyasu Kada
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Publication number: 20100168964Abstract: A motor vehicle steering apparatus (1) has a transmission-ratio variable mechanism (8) for changing, with the use of a transmission-ratio changing motor (18), the rotational transmission-ratio between a first steering shaft (5) connected to a steering member (2) and a second steering shaft (6) connected to a steering mechanism (12). The apparatus has a counter force compensating motor (23) for compensating steering counter force of the steering member (2) caused by operation of the transmission-ratio variable mechanism (8), a hydraulic steering assist mechanism (80), and a controller (24) for controlling the transmission-ratio changing motor (18) and the counter force compensating motor (23). The controller (24) has a function of causing the counter force compensating motor (23) to generate steering assist torque.Type: ApplicationFiled: October 1, 2007Publication date: July 1, 2010Inventors: Kenji Higashi, Kosuke Yamanaka, Atsushi Ishihara, Daisuke Maeda, Masami Naka, Tomoyasu Kada
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Patent number: 7678004Abstract: A rotation transmitting apparatus comprises a first sun gear joined to a first shaft so as to rotate interlockingly, a second shaft arranged to the first shaft coaxially, a second sun gear joined to the second shaft so as to rotate interlockingly, a first planetary gear meshed with the first sun gear, a second planetary gear rotating with the first planetary gear and meshed with the second sun gear, and a carrier supporting the first and second planetary gears and arranged to be driven by a differential electric motor. In particular, the number of teeth of each of the first and second sun gears and the first and second planetary gears is determined so that the ratio of a torque applied to the second shaft to a torque applied to the first shaft ranges from 1:0.7 to 1:0.9.Type: GrantFiled: March 8, 2006Date of Patent: March 16, 2010Assignee: JTEKT CorporationInventors: Kosuke Yamanaka, Shiro Nakano, Masami Naka, Tomoyasu Kada
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Patent number: 7568989Abstract: A rotation transmitting apparatus according to the present invention includes a first sun gear, a second sun gear, first planetary gears and second planetary gears. A carrier for supporting the respective planetary gears is integrally provided with a rotor of a speed change motor for changing a speed of rotation to be transmitted, so that the number of mesh portions in the gears is reduced. Further, the rotor is formed of a cylindrical shape and an input shaft for rotating the first sun gear is inserted into the rotor, so that a limited space is effectively used.Type: GrantFiled: February 15, 2006Date of Patent: August 4, 2009Assignee: JTEKT CorporationInventors: Masami Naka, Tomoyasu Kada, Shiro Nakano, Kosuke Yamanaka, Atsushi Ishihara, Kenji Higashi, Daisuke Maeda
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Publication number: 20080243341Abstract: A steered shaft of a steered mechanism is rigidly fixed to a vehicle body. Steering-stiffness is reduced by a lowpass filter for filtering a steered angle detected by a steered angle sensor. A deviation between a target steered angle and the filtered steered angle detected by the steered angle sensor is input to a PID control unit. A gain setting unit sets each of gains for PID control at a low value to thereby reduce steering-stiffness. The PID control unit outputs a target current. A drive circuit performs, e.g., PID control of the steering actuator.Type: ApplicationFiled: April 1, 2008Publication date: October 2, 2008Applicant: JTEKT CorporationInventors: Ryouhei HAYAMA, Tomoyasu Kada, Shingo Maeda, Shuuji Kimura
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Publication number: 20080164087Abstract: It is one object of the present invention to provide a steering device for a vehicle improving a resolution of detecting a steering reaction force thereby to control precisely a reaction actuator and to improve a steering feeling. The steering device for the vehicle is equipped with a reaction actuator 19 acting a steering reaction force on a steering wheel 1. This device further includes a steering angle sensor 11 detecting a steering angle ?h of the steering wheel 1, a controller 20 controlling the reaction actuator 19 according to the steering angle ?h, a torque sensor 12 detecting a steering torque Th acted on the steering wheel 1. The controller 20 controls in a feedback way the reaction actuator 11 based on the steering torque Th in a predetermined range including a middle point of the steering angle. The controller 20 drives, in a open-loop way without feed-backing the steering torque Th, the reaction actuator 19 out of the predetermined range of the steering angle ?h.Type: ApplicationFiled: December 26, 2007Publication date: July 10, 2008Applicant: JTEKT CorporationInventors: Shoji KOYAMA, Ryohei Hayama, Tomoyasu Kada
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Publication number: 20070265752Abstract: A motor vehicle steering system steers vehicle wheels in response to the operation of an operation member for steering a vehicle. The system includes a rutted road judging unit which judges whether the vehicle is driving on a rutted road or not, and a steering enhancement control unit which enhances steering of vehicle wheels in response to operation of the operation member when the rutted road judging unit judges that the vehicle is driving on a rutted road than when the rutted road judging unit judges that the vehicle is not driving on a rutted road.Type: ApplicationFiled: May 4, 2007Publication date: November 15, 2007Applicant: JTEKT CorporationInventors: Ryouhei Hayama, Shiro Nakano, Tomoyasu Kada
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Patent number: 7147080Abstract: The steering device is constructed by supporting a center portion of a rectangle-plate-shaped operation plate at one end of a supporting shaft projected from the front face of a dashboard so as to freely swing in right and left directions. A steering apparatus for a vehicle having the steering device detects the swing direction and the swing angle of the operation plate with a steering angle sensor provided at a support portion and moves a steering mechanism in the detected direction in accordance with the detected angle so as to steer the vehicle. With this structure, a load in steering can be decreased and tiredness in driving can be reduced. Furthermore, such a steering apparatus can realize a steering device which physically handicapped drivers can operate easily.Type: GrantFiled: April 1, 2003Date of Patent: December 12, 2006Assignee: Koyo Seiko Co., Ltd.Inventors: Masayasu Higashi, Shingo Maeda, Masaya Segawa, Shuuji Kimura, Ryouhei Hayama, Tomoyasu Kada
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Publication number: 20060205551Abstract: A rotation transmitting apparatus comprises a first sun gear joined to a first shaft so as to rotate interlockingly, a second shaft arranged to the first shaft coaxially, a second sun gear joined to the second shaft so as to rotate interlockingly, a first planetary gear meshed with the first sun gear, a second planetary gear rotating with the first planetary gear and meshed with the second sun gear, and a carrier supporting the first and second planetary gears and arranged to be driven by a differential electric motor. In particular, the number of teeth of each of the first and second sun gears and the first and second planetary gears is determined so that the ratio of a torque applied to the second shaft to a torque applied to the first shaft ranges from 1:0.7 to 1:0.9.Type: ApplicationFiled: March 8, 2006Publication date: September 14, 2006Inventors: Kosuke Yamanaka, Shiro Nakano, Masami Naka, Tomoyasu Kada
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Publication number: 20060183589Abstract: A rotation transmitting apparatus according to the present invention includes a first sun gear, a second sun gear, first planetary gears and second planetary gears. A carrier for supporting the respective planetary gears is integrally provided with a rotor of a speed change motor for changing a speed of rotation to be transmitted, so that the number of mesh portions in the gears is reduced. Further, the rotor is formed of a cylindrical shape and an input shaft for rotating the first sun gear is inserted into the rotor, so that a limited space is effectively used.Type: ApplicationFiled: February 15, 2006Publication date: August 17, 2006Inventors: Masami Naka, Tomoyasu Kada, Shiro Nakano, Kosuke Yamanaka, Atsushi Ishihara, Kenji Higashi, Daisuke Maeda
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Patent number: 6896090Abstract: In a normal state, a reaction force actuator (20) applies an operation reaction force to an steering member (2) through a planetary gear mechanism (6). When failure occurs in a steering actuator (12), the reaction force actuator (20) is turned off, and a plunger (13) locks the rotation of one element (18) which is connected to the reaction force actuator (20), in the planetary gear mechanism (6). In turn, a manual steering mode is set up in which a rotation of the steering member (2) is transmitted to a pinion gear (14) at a transmission ratio of the carrier (16) holding planetary gears (17) and a sun gear (15).Type: GrantFiled: June 18, 2003Date of Patent: May 24, 2005Assignee: Koyo Seiko Co., Ltd.Inventors: Naotake Kanda, Tomoyasu Kada, Kenji Higashi, Ryouhei Hayama, Takeo Iino, Shingo Maeda, Masayuki Ueno