Patents by Inventor Yasuji Mizutani
Yasuji Mizutani 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: 10940847Abstract: A brake control device adjusts a front wheel braking hydraulic pressure of front wheel cylinders provided on front wheels of a vehicle and a rear wheel braking hydraulic pressure of rear wheel cylinders provided on rear wheels of the vehicle. The brake control device includes a hydraulic pressure generating unit configured to adjust a hydraulic pressure generated by an electric motor to an adjusted hydraulic pressure and apply the adjusted hydraulic pressure as the rear wheel braking hydraulic pressure and a hydraulic pressure correcting unit configured to adjust to decrease the adjusted hydraulic pressure to be a corrected hydraulic pressure, and apply the corrected hydraulic pressure as the front wheel braking hydraulic pressure.Type: GrantFiled: September 20, 2018Date of Patent: March 9, 2021Assignees: ADVICS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Osayoshi Kato, Yoshio Masuda, Hiroyuki Kodama, Takayuki Yamamoto, Yasuji Mizutani
-
Publication number: 20200108809Abstract: An actuator controller controls one or more actuators operable by electric power supplied from a vehicle-mounted power source installed in a vehicle. The actuator controller includes: a voltage-drop-margin-value obtainer configured to obtain a voltage-drop margin value that is obtained by subtracting a lowest operation voltage required for an operation of the actuator controller, from a voltage of the vehicle-mounted power source; and an operation restrictor configured to restrict an operation of each of at least one actuator of the one or more actuators such that an amount of a voltage drop caused by an operation of the one or more actuators does not exceed the voltage-drop margin value obtained by the voltage-drop-margin-value obtainer.Type: ApplicationFiled: September 17, 2019Publication date: April 9, 2020Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yasuji MIZUTANI
-
Publication number: 20190092303Abstract: A brake control device adjusts a front wheel braking hydraulic pressure of front wheel cylinders 71, 72 provided on front wheels of a vehicle and a rear wheel braking hydraulic pressure of rear wheel cylinders 73, 74 provided on rear wheels of the vehicle. The brake control device includes a hydraulic pressure generating unit 1A configured to adjust a hydraulic pressure generated by an electric motor 11 to an adjusted hydraulic pressure and apply the adjusted hydraulic pressure as the rear wheel braking hydraulic pressure and a hydraulic pressure correcting unit 1B configured to adjust to decrease the adjusted hydraulic pressure to be a corrected hydraulic pressure, and apply the corrected hydraulic pressure as the front wheel braking hydraulic pressure.Type: ApplicationFiled: September 20, 2018Publication date: March 28, 2019Applicants: ADVICS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Osayoshi KATO, Yoshio MASUDA, Hiroyuki KODAMA, Takayuki YAMAMOTO, Yasuji MIZUTANI
-
Patent number: 9796369Abstract: A hydraulic brake system for braking a vehicle, including a master cylinder device having a fluid-flow permission mechanism that permits a flow of a working fluid between an inter-piston chamber and a low-pressure source, wherein, when a pressure of the working fluid to be supplied to a brake device exceeds a set pressure upon advancing in association with an advancing movement of a brake operation member, a closing and opening mechanism for hermetically closing the inter-piston chamber and opening an opposing chamber to the low-pressure source is controlled so as to hermetically close the inter-piston chamber, while, when the pressure of the working fluid becomes lower than a set pressure upon retracting in association with a retracting movement of the brake operation member, the fluid-flow permission mechanism is controlled so as to permit the flow of the working fluid between the inter-piston chamber and the low-pressure source.Type: GrantFiled: January 13, 2012Date of Patent: October 24, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroshi Isono, Yasuji Mizutani
-
Patent number: 9683584Abstract: The brake device for a vehicle generates two master pressures by controlling one single servo pressure to accurately control braking force. The pressure increasing characteristic is set based on the first pressure increasing characteristic obtained from the relationship between the servo pressure and the first master pressure upon increasing the servo pressure and the second pressure increasing characteristic obtained from the servo pressure and the second master pressure. The pressure decreasing characteristic is set based on the first pressure increasing characteristic obtained from the relationship between the servo pressure and the first master pressure upon decreasing the servo pressure and the second pressure decreasing characteristic obtained from the servo pressure and the second master pressure. Thus, the total braking force of the brake device is the sum of a braking force generated by the first master pressure and a braking force generated by the second master piston.Type: GrantFiled: May 30, 2013Date of Patent: June 20, 2017Assignees: ADVICS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshio Masuda, Hiroaki Niino, Akira Sakai, Yasuji Mizutani, Kiyoyuki Uchida, Masaaki Komazawa, Kazutaka Noro, Yusuke Kamiya
-
Patent number: 9499147Abstract: The vehicle brake system includes a cylinder, an output piston disposed in the cylinder, an input piston disposed in the cylinder but separating from the output piston and defining a separation chamber therebetween, a brake pedal connected to the input piston, a reaction force generating device for generating an elastic reaction force, a separation lock valve for controlling the communication between the separation chamber and the reaction force generating device, a fade state judging portion to judge whether the friction brake device is in a fade state or not and a friction braking force control portion for changing the mode to the fade state when the fade state judging portion judged that the friction brake device is in the fade state, wherein a desired friction braking force can be assured even under the brake fade state.Type: GrantFiled: June 14, 2013Date of Patent: November 22, 2016Assignee: ADVICS CO., LTD.Inventors: Yosuke Yamasoe, Hiroaki Niino, Yoshio Masuda, Takashi Kurokawa, Kiyoyuki Uchida, Masaaki Komazawa, Akira Sakai, Yasuji Mizutani, Yusuke Kamiya
-
Patent number: 9494172Abstract: A vehicle brake device is provided with a master cylinder, a master piston slidably arranged in the master cylinder, an input piston slidably arranged in the master cylinder to be separated from the master piston and defining a separation chamber, an input piston moving amount detecting section for detecting the moving amount of the input piston, a master piston moving amount calculating section for calculating the moving amount of the master piston based on the moving amount of the input piston, and a contact inferring section for inferring the contact of the input piston with the master piston based on the moving amount of the input piston and the moving amount of the master piston.Type: GrantFiled: March 25, 2013Date of Patent: November 15, 2016Assignee: ADVICS CO., LTD.Inventors: Masaki Maruyama, Yoshio Masuda, Akitaka Nishio, Kiyoyuki Uchida, Masaaki Komazawa, Akira Sakai, Yasuji Mizutani, Yusuke Kamiya
-
Patent number: 9365198Abstract: A braking device for a vehicle includes an operating characteristics setting portion for setting an operating characteristic which is a relationship between the input electric power to the electro-magnetic valve and a pressure difference between a master cylinder side and a wheel cylinder side with respect to the electro-magnetic valve, based on the input electric power at the time when the accumulator pressure detected by the accumulator pressure detecting portion first falls to a value equal to or less than a threshold value accumulator pressure by changing the input electric power towards an opening side of the electro-magnetic valve in response to a time lapsed after a predetermined value of the pilot pressure has been generated by the pilot pressure generating portion by first closing the electro-magnetic valve thereby to suppress the manufacturing cost.Type: GrantFiled: March 21, 2013Date of Patent: June 14, 2016Assignees: ADVICS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshio Masuda, Yasunori Sakata, Kazutaka Noro, Akira Sakai, Kiyoyuki Uchida, Masaaki Komazawa, Yasuji Mizutani, Yusuke Kamiya
-
Patent number: 9358891Abstract: A vehicle brake system for braking a vehicle including a braking-mode switching mechanism configured to selectively effectuate, depending upon situations of the vehicle brake system, one of (A) a regulated-pressure-dependent braking mode in which is generated a regulated-pressure-dependent braking force having a magnitude that depends on a regulated pressure of a working fluid and (B) a braking mode depending on an operation force and the regulated pressure in which are generated both of an operation-force-dependent braking force having a magnitude that depends on the operation force by a driver and the regulated-pressure-dependent braking force.Type: GrantFiled: May 21, 2012Date of Patent: June 7, 2016Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroshi Isono, Yasuji Mizutani
-
Patent number: 9333960Abstract: The vehicle braking control device adapted to a vehicle brake device having an electromagnetic valve which controls the brake fluid flow between the master cylinder and the wheel cylinders in response to the input electric energy. The vehicle braking control device includes a valve opening electric energy obtaining portion which obtains an input electric energy upon opening of the electromagnetic valve as a valve opening electric energy and an operation characteristic setting portion which sets an operation characteristic based on the valve opening electric energy obtained corresponding to the predetermined pressure differential. The opening valve electric energy obtaining portion changes the input electric energy at a valve closing side or a valve opening side with a change amount per unit of time larger than before valve opening in response to an obtaining of the valve opening electric energy.Type: GrantFiled: June 25, 2013Date of Patent: May 10, 2016Assignees: ADVICS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yosuke Kuki, Yoshio Masuda, Hiroaki Niino, Kiyoyuki Uchida, Masaaki Komazawa, Akira Sakai, Yasuji Mizutani, Yusuke Kamiya
-
Patent number: 9302663Abstract: A vehicle hydraulic brake system of the brake-by-wire type includes input piston and a master piston configured to be actuated under hydraulic pressure introduced into a second fluid chamber and mounted in the housing so as to be movable relative to each other through a partition wall and a first fluid chamber. The piston defines therein a communication passage which extends from a fourth fluid chamber to the first fluid chamber and in which a check valve is mounted. When the piston is advanced under hydraulic pressure introduced into the second fluid chamber, the volume of the fourth fluid chamber decreases, while the volume of the first fluid chamber increases. This allows brake fluid in the fourth fluid chamber to be quickly released into the first fluid chamber through the communication passage and through a pipe line in which an electromagnetic on-off valve are mounted.Type: GrantFiled: March 21, 2013Date of Patent: April 5, 2016Assignees: ADVICS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Akihiko Miwa, Yosuke Yamasoe, Hiroshi Isono, Yasuji Mizutani
-
Patent number: 9163645Abstract: A vehicle brake system includes a cylinder, a master piston including a pressure applying piston and a projection portion, a servo chamber, a contact/separation determining means determining a separated state and a contact state between the input piston and the master piston, a pilot pressure generating device generating a pilot pressure, a servo pressure generating device, a servo pressure measuring device measuring a servo pressure, and a master pressure estimating means estimating a master pressure from the pilot pressure and a first servo ratio, which is a cross-sectional area ratio between a first pilot chamber and a servo pressure generating chamber, in a case of the separated state, and estimating the master pressure based on the servo pressure, the pilot pressure and a second servo ratio, which is a cross-sectional area ratio between a second pilot chamber and the servo pressure generating chamber, in a case of the contact state.Type: GrantFiled: March 22, 2013Date of Patent: October 20, 2015Assignee: ADVICS CO., LTD.Inventors: Masaki Maruyama, Yoshio Masuda, Akitaka Nishio, Akira Sakai, Yasuji Mizutani, Kiyoyuki Uchida, Masaaki Komazawa, Yusuke Kamiya
-
Publication number: 20150203088Abstract: The vehicle braking control device adapted to a vehicle brake device having an electromagnetic valve which controls the brake fluid flow between the master cylinder and the wheel cylinders in response to the input electric energy. The vehicle braking control device includes a valve opening electric energy obtaining portion which obtains an input electric energy upon opening of the electromagnetic valve as a valve opening electric energy and an operation characteristic setting portion which sets an operation characteristic based on the valve opening electric energy obtained corresponding to the predetermined pressure differential. The opening valve electric energy obtaining portion changes the input electric energy at a valve closing side or a valve opening side with a change amount per unit of time larger than before valve opening in response to an obtaining of the valve opening electric energy.Type: ApplicationFiled: June 25, 2013Publication date: July 23, 2015Inventors: Yosuke Kuki, Yoshio Masuda, Hiroaki Niino, Kiyoyuki Uchida, Masaaki Komazawa, Akira Sakai, Yasuji Mizutani, Yusuke Kamiya
-
Publication number: 20150151729Abstract: The vehicle brake system includes a cylinder, an output piston disposed in the cylinder, an input piston disposed in the cylinder but separating from the output piston and defining a separation chamber therebetween, a brake pedal connected to the input piston, a reaction force generating device for generating an elastic reaction force, a separation lock valve for controlling the communication between the separation chamber and the reaction force generating device, a fade state judging portion to judge whether the friction brake device is in a fade state or not and a friction braking force control portion for changing the mode to the fade state when the fade state judging portion judged that the friction brake device is in the fade state, wherein a desired friction braking force can be assured even under the brake fade state.Type: ApplicationFiled: June 14, 2013Publication date: June 4, 2015Inventors: Yosuke Yamasoe, Hiroaki Niino, Yoshio Masuda, Takashi Kurokawa, Kiyoyuki Uchida, Masaaki Komazawa, Akira Sakai, Yasuji Mizutani, Yusuke Kamiya
-
Publication number: 20150130264Abstract: A vehicle brake system for braking a vehicle including a braking-mode switching mechanism configured to selectively effectuate, depending upon situations of the vehicle brake system, one of (A) a regulated-pressure-dependent braking mode in which is generated a regulated-pressure-dependent braking force having a magnitude that depends on a regulated pressure of a working fluid and (B) a braking mode depending on an operation force and the regulated pressure in which are generated both of an operation-force-dependent braking force having a magnitude that depends on the operation force by a driver and the regulated-pressure-dependent braking force.Type: ApplicationFiled: May 21, 2012Publication date: May 14, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroshi Isono, Yasuji Mizutani
-
Publication number: 20150107240Abstract: The brake device for a vehicle generates two master pressures by controlling one single servo pressure to accurately control braking force. The pressure increasing characteristic is set based on the first pressure increasing characteristic obtained from the relationship between the servo pressure and the first master pressure upon increasing the servo pressure and the second pressure increasing characteristic obtained from the servo pressure and the second master pressure. The pressure decreasing characteristic is set based on the first pressure increasing characteristic obtained from the relationship between the servo pressure and the first master pressure upon decreasing the servo pressure and the second pressure decreasing characteristic obtained from the servo pressure and the second master pressure. Thus, the total braking force of the brake device is the sum of a braking force generated by the first master pressure and a braking force generated by the second master piston.Type: ApplicationFiled: May 30, 2013Publication date: April 23, 2015Inventors: Yoshio Masuda, Hiroaki Niino, Akira Sakai, Yasuji Mizutani, Kiyoyuki Uchida, Masaaki Komazawa, Kazutaka Noro, Yusuke Kamiya
-
Publication number: 20150021976Abstract: A vehicle hydraulic brake system of the brake-by-wire type includes input piston and a master piston configured to be actuated under hydraulic pressure introduced into a second fluid chamber and mounted in the housing so as to be movable relative to each other through a partition wall and a first fluid chamber. The piston defines therein a communication passage which extends from a fourth fluid chamber to the first fluid chamber and in which a check valve is mounted. When the piston is advanced under hydraulic pressure introduced into the second fluid chamber, the volume of the fourth fluid chamber decreases, while the volume of the first fluid chamber increases. This allows brake fluid in the fourth fluid chamber to be quickly released into the first fluid chamber through the communication passage and through a pipe line in which an electromagnetic on-off valve are mounted.Type: ApplicationFiled: March 21, 2013Publication date: January 22, 2015Inventors: Akihiko Miwa, Yosuke Yamasoe, Hiroshi Isono, Yasuji Mizutani
-
Publication number: 20150015061Abstract: In a braking device for a vehicle, an operating characteristics setting portion is provided for setting an operating characteristic which is a relationship between the input electric power to the electro-magnetic valve and a pressure difference between a master cylinder side and a wheel cylinder side with respect to the electro-magnetic valve, based on the input electric power at the time when the accumulator pressure detected by the accumulator pressure detecting portion first falls to a value equal to or less than a threshold value accumulator pressure by changing the input electric power towards an opening side of the electro-magnetic valve in response to a time lapsed after a predetermined value of the pilot pressure has been generated by the pilot pressure generating portion by first closing the electro-magnetic valve thereby to suppress the manufacturing cost.Type: ApplicationFiled: March 21, 2013Publication date: January 15, 2015Applicants: ADVICS CO., LTD, Toyota Jidosha Kabushiki KaishaInventors: Yoshio Masuda, Yasunori Sakata, Kazutaka Noro, Akira Sakai, Kiyoyuki Uchida, Masaaki Komazawa, Yasuji Mizutani, Yusuke Kamiya
-
Publication number: 20140345271Abstract: A hydraulic brake system for braking a vehicle, including a master cylinder device having a fluid-flow permission mechanism that permits a flow of a working fluid between an inter-piston chamber and a low-pressure source, wherein, when a pressure of the working fluid to be supplied to a brake device exceeds a set pressure upon advancing in association with an advancing movement of a brake operation member, a closing and opening mechanism for hermetically closing the inter-piston chamber and opening an opposing chamber to the low-pressure source is controlled so as to hermetically close the inter-piston chamber, while, when the pressure of the working fluid becomes lower than a set pressure upon retracting in association with a retracting movement of the brake operation member, the fluid-flow permission mechanism is controlled so as to permit the flow of the working fluid between the inter-piston chamber and the low-pressure source.Type: ApplicationFiled: January 13, 2012Publication date: November 27, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroshi Isono, Yasuji Mizutani
-
Publication number: 20140250883Abstract: A vehicle brake system includes a cylinder, a master piston including a pressure applying piston and a projection portion, a servo chamber, a contact/separation determining means determining a separated state and a contact state between the input piston and the master piston, a pilot pressure generating device generating a pilot pressure, a servo pressure generating device, a servo pressure measuring device measuring a servo pressure, and a master pressure estimating means estimating a master pressure from the pilot pressure and a first servo ratio, which is a cross-sectional area ratio between a first pilot chamber and a servo pressure generating chamber, in a case of the separated state, and estimating the master pressure based on the servo pressure, the pilot pressure and a second servo ratio, which is a cross-sectional area ratio between a second pilot chamber and the servo pressure generating chamber, in a case of the contact state.Type: ApplicationFiled: March 22, 2013Publication date: September 11, 2014Inventors: Masaki Maruyama, Yoshio Masuda, Akitaka Nishio, Akira Sakai, Yasuji Mizutani, Kiyoyuki Uchida, Masaaki Komazawa, Yusuke Kamiya