Patents by Inventor Takemi Murayama
Takemi Murayama 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: 11618435Abstract: A vehicle control system executes vehicle stability control and driving assist control. The vehicle control system calculates an unstable state quantity representing instability of the vehicle and an activation threshold of the vehicle stability control, based on a vehicle state detected by a sensor installed on the vehicle. A state change amount is an amount of increase in the unstable state quantity from an average unstable state quantity that is obtained when a lateral acceleration of the vehicle is within a predetermined range. A threshold change amount is an amount of increase in the activation threshold from an average activation threshold that is obtained when the lateral acceleration is within the predetermined range. When the driving assist control is in execution, the vehicle control system activates the vehicle stability control in response to the state change amount becoming larger than the threshold change amount.Type: GrantFiled: April 9, 2021Date of Patent: April 4, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Takemi Murayama
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Publication number: 20210323535Abstract: A vehicle control system executes vehicle stability control and driving assist control. The vehicle control system calculates an unstable state quantity representing instability of the vehicle and an activation threshold of the vehicle stability control, based on a vehicle state detected by a sensor installed on the vehicle. A state change amount is an amount of increase in the unstable state quantity from an average unstable state quantity that is obtained when a lateral acceleration of the vehicle is within a predetermined range. A threshold change amount is an amount of increase in the activation threshold from an average activation threshold that is obtained when the lateral acceleration is within the predetermined range. When the driving assist control is in execution, the vehicle control system activates the vehicle stability control in response to the state change amount becoming larger than the threshold change amount.Type: ApplicationFiled: April 9, 2021Publication date: October 21, 2021Inventor: Takemi Murayama
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Patent number: 10926794Abstract: A vehicular behavior control apparatus in which a control unit that controls a driving device and a braking device is configured to calculate a target yaw moment and a target deceleration of the vehicle for ensuring stable behavior of the vehicle during non-braking turning, to calculate a first vehicle longitudinal force applied to a turning inner wheel to achieve the target yaw moment and a second vehicle longitudinal force necessary to achieve the target deceleration, to control, when the first vehicle longitudinal force is equal to or less than the second vehicle longitudinal force, the driving device so as to generate a driving force equal to a value obtained by subtracting the second vehicle longitudinal force from a driver-requested driving force and adding the first vehicle longitudinal force, and to apply the first vehicle longitudinal force to the turning inner wheel.Type: GrantFiled: October 29, 2018Date of Patent: February 23, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takemi Murayama, Hisanori Mitsumoto, Takuya Shoji, Noritsugu Iwazaki, Go Inoue
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Patent number: 10737688Abstract: A behavior control apparatus is provided which is configured to calculate a first normative yaw rate of the vehicle based on a vehicle speed, a steering angle and a lateral acceleration of the vehicle, to calculate a second normative yaw rate of the vehicle based on a vehicle speed and a steering angle, to determine, when deflection control is not being performed, that vehicle behavior is unstable when an absolute value of a first yaw rate deviation between the first normative yaw rate and an actual yaw rate of the vehicle is larger than a first reference value, and to determine, when the deflection control is being performed, that vehicle behavior is unstable when an absolute value of a second yaw rate deviation between the second normative yaw rate and an actual yaw rate of the vehicle is larger than a second reference value.Type: GrantFiled: November 15, 2018Date of Patent: August 11, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hisanori Mitsumoto, Takemi Murayama
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Publication number: 20190152471Abstract: A behavior control apparatus is provided which is configured to calculate a first normative yaw rate of the vehicle based on a vehicle speed, a steering angle and a lateral acceleration of the vehicle, to calculate a second normative yaw rate of the vehicle based on a vehicle speed and a steering angle, to determine, when deflection control is not being performed, that vehicle behavior is unstable when an absolute value of a first yaw rate deviation between the first normative yaw rate and an actual yaw rate of the vehicle is larger than a first reference value, and to determine, when the deflection control is being performed, that vehicle behavior is unstable when an absolute value of a second yaw rate deviation between the second normative yaw rate and an actual yaw rate of the vehicle is larger than a second reference value.Type: ApplicationFiled: November 15, 2018Publication date: May 23, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hisanori MITSUMOTO, Takemi MURAYAMA
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Publication number: 20190126976Abstract: A vehicular behavior control apparatus in which a control unit that controls a driving device and a braking device is configured to calculate a target yaw moment and a target deceleration of the vehicle for ensuring stable behavior of the vehicle during non-braking turning, to calculate a first vehicle longitudinal force applied to a turning inner wheel to achieve the target yaw moment and a second vehicle longitudinal force necessary to achieve the target deceleration, to control, when the first vehicle longitudinal force is equal to or less than the second vehicle longitudinal force, the driving device so as to generate a driving force equal to a value obtained by subtracting the second vehicle longitudinal force from a driver-requested driving force and adding the first vehicle longitudinal force, and to apply the first vehicle longitudinal force to the turning inner wheel.Type: ApplicationFiled: October 29, 2018Publication date: May 2, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takemi MURAYAMA, Hisanori MITSUMOTO, Takuya SHOJI, Noritsugu IWAZAKI, Go INOUE
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Patent number: 9823111Abstract: A predetermined relationship among various loading states, stability factor (Kh) of a vehicle and lateral acceleration (Gy) of the vehicle is stored in a storage device (30A) as a reference relationship (i.e. a map). Information regarding a lateral acceleration (Gy) of the vehicle is acquired using a lateral acceleration sensor (40). An estimated value of the stability factor (Kh) of the vehicle is calculated on the basis of vehicle travelling data when turning. A loading state of the vehicle is estimated on the basis of the area in which the estimated value of the stability factor and the lateral acceleration of the vehicle which is at the same point in time as the vehicle travelling data which were provided for the calculation of the estimated value belong in the reference relationship.Type: GrantFiled: December 27, 2011Date of Patent: November 21, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tomotaka Asano, Takemi Murayama
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Patent number: 9764717Abstract: A slope-descending speed control device 10 for a vehicle configured to control a vehicle deceleration so that an actual vehicle speed conforms to a target vehicle speed in accordance with a target deceleration Gxbt of a PID feedback control executed in accordance with a difference between a target vehicle speed Vxt and an actual vehicle speed Vx. In a situation where an actual vehicle speed is higher than a target vehicle speed, with a component in a hill-descending direction of gravitational acceleration of the vehicle at a time point when a condition for starting a slope-descending speed control is satisfied being a reference gravitational acceleration Gxd0, when a difference between a component Gxd in a hill-descending direction of gravitational acceleration and the reference gravitational acceleration Gxd0 is between upper and lower reference values, a target deceleration Gxbti of the integral term is not integrated to restrain its increase.Type: GrantFiled: September 25, 2014Date of Patent: September 19, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Taisuke Yasutomi, Takemi Murayama, Hideki Kato
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Publication number: 20160200297Abstract: A slope-descending speed control device 10 for a vehicle configured to control a vehicle deceleration so that an actual vehicle speed conforms to a target vehicle speed in accordance with a target deceleration Gxbt of a PID feedback control executed in accordance with a difference between a target vehicle speed Vxt and an actual vehicle speed Vx. In a situation where an actual vehicle speed is higher than a target vehicle speed, with a component in a hill-descending direction of gravitational acceleration of the vehicle at a time point when a condition for starting a slope-descending speed control is satisfied being a reference gravitational acceleration Gxd0, when a difference between a component Gxd in a hill-descending direction of gravitational acceleration and the reference gravitational acceleration Gxd0 is between upper and lower reference values, a target deceleration Gxbti of the integral term is not integrated to restrain its increase.Type: ApplicationFiled: September 25, 2014Publication date: July 14, 2016Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Taisuke YASUTOMI, Takemi MURAYAMA, Hideki KATO
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Publication number: 20140365171Abstract: A predetermined relationship among various loading states, stability factor (Kh) of a vehicle and lateral acceleration (Gy) of the vehicle is stored in a storage device (30A) as a reference relationship (i.e. a map). Information regarding a lateral acceleration (Gy) of the vehicle is acquired using a lateral acceleration sensor (40). An estimated value of the stability factor (Kh) of the vehicle is calculated on the basis of vehicle travelling data when turning. A loading state of the vehicle is estimated on the basis of the area in which the estimated value of the stability factor and the lateral acceleration of the vehicle which is at the same point in time as the vehicle travelling data which were provided for the calculation of the estimated value belong in the reference relationship.Type: ApplicationFiled: December 27, 2011Publication date: December 11, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tomotaka Asano, Takemi Murayama
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Publication number: 20090266314Abstract: This invention provides a coolant-containing hollow poppet valve, which, in use, in consideration of a temperature distribution caused in each pert of the valve, causes a lowering in fatigue strength and creep strength in the valve at its site exposed to high temperatures falling within the tolerante of design standard, and, in consideration of required properties at the other valve sites, holds abrasion resistance and strength, and a process for producing the same.Type: ApplicationFiled: November 15, 2005Publication date: October 29, 2009Applicant: NITTAN VALVE CO., LTD.Inventors: Takehiko Uchiyama, Takemi Murayama, Teruaki Ando
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Patent number: 6679478Abstract: In order to propose a hollow poppet valve having an excellent, high strength to weight properties by constructing it in order that no influence from welding heat is exerted onto the face, and no stress is concentrated at the welded portion, and a method for manufacturing the same valve, a fillet area 14 opened like a flare is integrally formed at one end of the cylindrical stem portion 12, and a cap is integrally welded to the open edge portion of the fillet area, wherein only the open edge portion of the fillet area 14 is made thicker than the other portions, and the face 15 is formed on the thicker portion 30. Thereby, it is possible to prevent the hardness of the face 15 from being lowered due to the cap welding heat, and stress from being concentrated at the welded portion, whereby the property of high strength to weight can be improved.Type: GrantFiled: December 6, 2001Date of Patent: January 20, 2004Assignee: Nittan Valve Co., Ltd.Inventor: Takemi Murayama
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Patent number: 6378543Abstract: In order to propose a hollow poppet valve having an excellent, high strength to weight properties by constructing it in order that no influence from welding heat is exerted onto the face, and no stress is concentrated at the welded portion, and a method for manufacturing the same valve, a fillet area 14 opened like a flare is integrally formed at one end of the cylindrical stem portion 12, and a cap is integrally welded to the open edge portion of the fillet area, wherein only the open edge portion of the fillet area 14 is made thicker than the other portions, and the face 15 is formed on the thicker portion 30. Thereby, it is possible to prevent the hardness of the face 15 from being lowered due to the cap welding heat, and stress from being concentrated at the welded portion, whereby the property of high strength to weight can be improved.Type: GrantFiled: July 17, 2000Date of Patent: April 30, 2002Assignee: Nittan Valve Co., Ltd.Inventor: Takemi Murayama
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Publication number: 20020036280Abstract: In order to propose a hollow poppet valve having an excellent, high strength to weight properties by constructing it in order that no influence from welding heat is exerted onto the face, and no stress is concentrated at the welded portion, and a method for manufacturing the same valve, a fillet area 14 opened like a flare is integrally formed at one end of the cylindrical stem portion 12, and a cap is integrally welded to the open edge portion of the fillet area, wherein only the open edge portion of the fillet area 14 is made thicker than the other portions, and the face 15 is formed on the thicker portion 30. Thereby, it is possible to prevent the hardness of the face 15 from being lowered due to the cap welding heat, and stress from being concentrated at the welded portion, whereby the property of high strength to weight can be improved.Type: ApplicationFiled: December 6, 2001Publication date: March 28, 2002Inventor: Takemi Murayama