Patents by Inventor Hidehisa Kato
Hidehisa Kato 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: 11590942Abstract: A braking force control apparatus has an upstream braking actuator for generating an upstream pressure common to four wheels, a downstream braking actuator individually controlling braking pressures supplied to braking force generating devices of the wheels using the upstream pressure, and a control unit. When the downstream braking actuator is abnormal and the upstream pressure can be supplied to the braking force generating devices, but a braking pressure of any one of the wheels cannot be normally reduced, the control unit selects higher one of the target braking pressures of the left and right front wheels and higher one of the left and right rear wheels, determines lower one of the two selected target braking pressures as a backup target upstream pressure, and controls the upstream braking actuator such that the upstream pressure becomes the backup target upstream pressure.Type: GrantFiled: March 4, 2020Date of Patent: February 28, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hidehisa Kato, Masahiro Hara
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Patent number: 11279332Abstract: A braking force control apparatus is provided which has an upstream braking actuator for generating an upstream pressure common to four wheels, a downstream braking actuator individually controlling braking pressure supplied to braking force generating devices of the wheels using the upstream pressure, and a control unit. When the downstream braking actuator is abnormal and the upstream pressure can be supplied to the braking force generating devices, but a braking pressure of any one of the wheels cannot be normally controlled, the control unit selects a control mode on the pressure increasing side out of the front wheel control modes, selects a control mode on the pressure increasing side out of the rear wheel control modes, selects a control mode on the pressure decreasing side out of the two selected control modes as a prescribed control mode, and controls the upstream pressure in the prescribed control mode.Type: GrantFiled: October 4, 2018Date of Patent: March 22, 2022Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hidehisa Kato, Masahiro Hara, Yuji Yoshii
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Patent number: 10889290Abstract: Provided is a control apparatus for a four-wheel-drive vehicle configured to, when a degree of transmission of a driving force to a side of rear wheels is smaller than a predetermined degree, calculate a correction value for a wheel speed based on a rotation-related value, and calculate a wheel speed through use of the rotation-related value and the correction value.Type: GrantFiled: November 21, 2019Date of Patent: January 12, 2021Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yusuke Suetake, Noritsugu Iwazaki, Hidehisa Kato
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Publication number: 20200282963Abstract: A braking force control apparatus has an upstream braking actuator for generating an upstream pressure common to four wheels, a downstream braking actuator individually controlling braking pressures supplied to braking force generating devices of the wheels using the upstream pressure, and a control unit. When the downstream braking actuator is abnormal and the upstream pressure can be supplied to the braking force generating devices, but a braking pressure of any one of the wheels cannot be normally reduced, the control unit selects higher one of the target braking pressures of the left and right front wheels and higher one of the left and right rear wheels, determines lower one of the two selected target braking pressures as a backup target upstream pressure, and controls the upstream braking actuator such that the upstream pressure becomes the backup target upstream pressure.Type: ApplicationFiled: March 4, 2020Publication date: September 10, 2020Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hidehisa KATO, Masahiro HARA
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Publication number: 20200164868Abstract: Provided is a control apparatus for a four-wheel-drive vehicle configured to, when a degree of transmission of a driving force to a side of rear wheels is smaller than a predetermined degree, calculate a correction value for a wheel speed based on a rotation-related value, and calculate a wheel speed through use of the rotation-related value and the correction value.Type: ApplicationFiled: November 21, 2019Publication date: May 28, 2020Inventors: Yusuke Suetake, Noritsugu Iwazaki, Hidehisa Kato
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Publication number: 20190106091Abstract: A braking force control apparatus is provided which has a first system including a first upstream braking actuator and a first downstream braking actuator, a second system including a second upstream braking actuator and a second downstream braking actuator, and a control unit. When the downstream braking actuator is abnormal and the upstream pressure can be supplied to braking force generating devices, but a braking pressure of any one of the wheels cannot be normally controlled, the control unit select the pressure increasing side control mode out of the front wheel control modes as a first prescribed control mode, select the pressure decreasing side control mode out of the rear wheel control modes as a second prescribed control mode, and to control the first and second upstream pressures in the first and second prescribed control modes.Type: ApplicationFiled: October 4, 2018Publication date: April 11, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hidehisa KATO
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Publication number: 20190106090Abstract: A braking force control apparatus is provided which has an upstream braking actuator for generating an upstream pressure common to four wheels, a downstream braking actuator individually controlling braking pressure supplied to braking force generating devices of the wheels using the upstream pressure, and a control unit. When the downstream braking actuator is abnormal and the upstream pressure can be supplied to the braking force generating devices, but a braking pressure of any one of the wheels cannot be normally controlled, the control unit selects a control mode on the pressure increasing side out of the front wheel control modes, selects a control mode on the pressure increasing side out of the rear wheel control modes, selects a control mode on the pressure decreasing side out of the two selected control modes as a prescribed control mode, and controls the upstream pressure in the prescribed control mode.Type: ApplicationFiled: October 4, 2018Publication date: April 11, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hidehisa KATO, Masahiro HARA, Yuji YOSHII
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Publication number: 20180056953Abstract: A brake control device for a vehicle, includes: a master cylinder outputting a brake fluid of a master pressure; a master pressure changing device for changing the master pressure; a brake actuator for controlling a brake pressure of the brake fluid supplied from the master cylinder to a wheel cylinder; and a control device performing an automatic brake control including first and second modes. In the first mode, the control device operates the brake actuator to make a target value of the brake pressure. In the second mode, the control device operates the master pressure changing device such that the master pressure becomes the target value of the brake pressure to change the brake pressure of the target wheel in conjunction with the master pressure. The control device selects one of the first and second modes depending on a type of the automatic brake control.Type: ApplicationFiled: May 23, 2017Publication date: March 1, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hidehisa KATO
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Patent number: 8825330Abstract: In a vehicle brake device having a hydraulic pressure sensor for detecting an output value corresponding to the pressure of a fluid pressure adjusted by a master cylinder and a master cylinder pressure calculating unit for storing the output value of the hydraulic pressure sensor at which the pressure of the master cylinder becomes 0 as a zero-point correction value and calculating a master cylinder pressure by correcting the output value of the hydraulic pressure sensor based on the zero-point correction value, the vehicle brake device has a zero-point correction value updating unit for setting, when the output value detected by the hydraulic pressure sensor is smaller than the zero-point correction value stored in the master cylinder pressure calculating unit, the output value as a new zero-point correction value and updating the zero-point correction value.Type: GrantFiled: February 3, 2012Date of Patent: September 2, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yoshinori Watanabe, Hiroyuki Matsubayashi, Hidehisa Kato
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Publication number: 20140195133Abstract: A vehicle braking force control device includes a controller that controls braking force of a wheel by controlling friction braking force generated by a friction braking device and regenerative braking force generated by regenerative braking devices and that performs anti-skid control based on a requested amount of braking force reduction by controlling the friction braking force and reducing the regenerative braking force by an amount of regenerative braking force reduction. The controller sets a target change amount of the friction braking force based on the requested amount of braking force reduction and the amount of regenerative braking force reduction, and controls the friction braking force based on the target change amount when the controller reduces the regenerative braking force by the amount of regenerative braking force reduction.Type: ApplicationFiled: August 9, 2012Publication date: July 10, 2014Applicants: ADVICS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hidehisa Kato, Takayuki Goto, Atsushi Sone, Akifumi Doura
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Publication number: 20130325253Abstract: In a vehicle brake device having a hydraulic pressure sensor for detecting an output value corresponding to the pressure of a fluid pressure adjusted by a master cylinder and a master cylinder pressure calculating unit for storing the output value of the hydraulic pressure sensor at which the pressure of the master cylinder becomes 0 as a zero-point correction value and calculating a master cylinder pressure by correcting the output value of the hydraulic pressure sensor based on the zero-point correction value, the vehicle brake device has a zero-point correction value updating unit for setting, when the output value detected by the hydraulic pressure sensor is smaller than the zero-point correction value stored in the master cylinder pressure calculating unit, the output value as a new zero-point correction value and updating the zero-point correction value.Type: ApplicationFiled: February 3, 2012Publication date: December 5, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshinori Watanabe, Hiroyuki Matsubayashi, Hidehisa Kato
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Patent number: 8600638Abstract: When a the brake assist control and a left/right distribution control are performed at the same time, since braking forces, which are equal to or larger than the braking force generated by a brake operation of a driver, are generated to wheels by the brake assist control, in a case where the driver requests a large deceleration, a desired deceleration can be obtained. Further, since a difference is made between the braking forces generated to left/right wheels by the left/right distribution control, in a case where a yaw direction behavior is generated to a vehicle, the yaw direction behavior can be reduced by a difference between the braking forces.Type: GrantFiled: January 15, 2009Date of Patent: December 3, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventor: Hidehisa Kato
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Patent number: 8573711Abstract: A vehicle braking apparatus that can exert high braking performance during vehicle braking is implemented by a control mode that can be realized in a braking apparatus (10) of usual hardware. In controlling the braking apparatus (10) of a vehicle, a climb rate of a wheel cylinder braking oil pressure (Pw) is decreased smaller than a climb rate corresponding to a climb rate of a master cylinder oil pressure (Pm) from a time point at which the wheel cylinder braking oil pressure (Pw) reaches a predetermined threshold value. The time point at which the wheel cylinder braking oil pressure (Pw) reaches the predetermined threshold value (P3) is estimated based on the climb process of the master cylinder oil pressure (Pm) or directly detected.Type: GrantFiled: January 15, 2009Date of Patent: November 5, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hidehisa Kato, Junji Kawamuro, Tetsuhiro Narita
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Patent number: 8548676Abstract: A vehicle braking device including a braking operation judging unit that judges that a braking operation is input when a fluid pressure detected by a pressure detecting sensor is not smaller than a threshold value set in advance in a process of a first mode in which it is judged that the device normally operates, and judges that the braking operation is input when judging that wheel deceleration of a tire detected by a wheel speed detecting sensor is larger than a threshold value in a process of a second mode in which it is judged the pressure detecting sensor does not normally detect a pressure or it is judged that a failure occurs in the fluid pressure, and a control unit puts a brake lamp arranged on a vehicle body into a lighting state from a non-lighting state when it is judged that the braking operation is input.Type: GrantFiled: October 28, 2010Date of Patent: October 1, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yoshinori Watanabe, Hiroyuki Matsubayashi, Hidehisa Kato
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Patent number: 8527174Abstract: A brake controlling apparatus (electronic control unit) of a braking device including a booster valve to be opened at a time of request to boost a pressure of a brake liquid to supply to a wheel to be controlled, and a piston pump for supplying pressurized brake liquid to an upstream side of the booster valve, the brake controlling apparatus including a brake liquid pressure controlling unit that sets a duty ratio between a closing period and a opening period of the booster valve so that a dischargeable period of the brake liquid in the piston pump appears in the opening period of the booster valve and controls the booster valve based on the duty ratio.Type: GrantFiled: December 9, 2008Date of Patent: September 3, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Ryochi Watanabe, Hidehisa Kato
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Publication number: 20130211668Abstract: A vehicle braking device including a braking operation judging unit that judges that a braking operation is input when a fluid pressure detected by a pressure detecting sensor is not smaller than a threshold value set in advance in a process of a first mode in which it is judged that the device normally operates, and judges that the braking operation is input when judging that wheel deceleration of a tire detected by a wheel speed detecting sensor is larger than a threshold value in a process of a second mode in which it is judged the pressure detecting sensor does not normally detect a pressure or it is judged that a failure occurs in the fluid pressure, and a control unit puts a brake lamp arranged on a vehicle body into a lighting state from a non-lighting state when it is judged that the braking operation is input.Type: ApplicationFiled: October 28, 2010Publication date: August 15, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshinori Watanabe, Hiroyuki Matsubayashi, Hidehisa Kato
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Publication number: 20130204491Abstract: Provided is a vehicle braking device for applying a braking force on tires arranged on a vehicle body rotatably, the vehicle braking device including a fluid pressure braking unit configured to act the braking force on the tires; a master cylinder configured to supply fluid pressure to the fluid pressure braking unit; a pressure detection sensor configured to detect pressure of the fluid pressure supplied from the master cylinder to the fluid pressure braking unit; and a control device that includes a storage unit configured to store detected driving conditions, a braking operation determining unit configured to determine state of the braking operation based on the fluid pressure detected by the pressure detection sensor, and a control unit configured to control operation based on the determination result of the braking operation determining unit.Type: ApplicationFiled: October 13, 2010Publication date: August 8, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroyuki Matsubayashi, Hidehisa Kato, Yoshinori Watanabe
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Publication number: 20110246041Abstract: When a the brake assist control and a left/right distribution control are performed at the same time, since braking forces, which are equal to or larger than the braking force generated by a brake operation of a driver, are generated to wheels by the brake assist control, in a case where the driver requests a large deceleration, a desired deceleration can be obtained. Further, since a difference is made between the braking forces generated to left/right wheels by the left/right distribution control, in a case where a yaw direction behavior is generated to a vehicle, the yaw direction behavior can be reduced by a difference between the braking forces.Type: ApplicationFiled: January 15, 2009Publication date: October 6, 2011Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hidehisa Kato
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Publication number: 20110231076Abstract: A brake controlling apparatus (electronic control unit) of a braking device including a booster valve to be opened at a time of request to boost a pressure of a brake liquid to supply to a wheel to be controlled, and a piston pump for supplying pressurized brake liquid to an upstream side of the booster valve, the brake controlling apparatus including a brake liquid pressure controlling unit that sets a duty ratio between a closing period and a opening period of the booster valve so that a dischargeable period of the brake liquid in the piston pump appears in the opening period of the booster valve, and controls the booster valve based on the duty ratio.Type: ApplicationFiled: December 9, 2008Publication date: September 22, 2011Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ryochi Watanabe, Hidehisa Kato
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Publication number: 20110190998Abstract: Provided in a vehicle, in which front wheels are provided so as to be braked by disc brakes and rear wheels are provided so as to be braked by drum brakes, is an automatic braking control section that controls the deceleration of the vehicle by adjusting only the hydraulic pressure applied to the disc brakes when the automatic braking control is performed. Thus, when the automatic braking control is performed, the braking force of the drum brakes is not adjusted and therefore, it is possible to suppress the instability of the deceleration of the vehicle caused by adjusting the braking force of the drum brakes of which the braking force is difficult to control. As a result, it is possible to stabilize braking when the automatic braking is performed.Type: ApplicationFiled: September 25, 2009Publication date: August 4, 2011Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hidehisa Kato, Hisashi Kajita