Patents by Inventor Masayuki Kikawa

Masayuki Kikawa 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).

  • Publication number: 20210046909
    Abstract: An electric brake system includes a hydraulic pressure control circuit configured to acquire a detected value from a hydraulic pressure detection portion configured to detect a hydraulic pressure in a master cylinder and control driving of an electric actuator in such a manner that a target hydraulic pressure corresponding to a braking instruction is generated in the master cylinder, a fluid amount control circuit configured to drive a fluid amount supply device disposed between the master cylinder and a wheel cylinder to control a fluid amount to supply to the wheel cylinder, and a storage circuit configured to store a fluid amount characteristic, which is a characteristic of the fluid amount with respect to the detected value. The fluid amount control circuit controls the fluid amount supply device based on the fluid amount characteristic stored in the storage circuit.
    Type: Application
    Filed: February 20, 2019
    Publication date: February 18, 2021
    Inventors: Suguru SAOTOME, Norikazu MATSUZAKI, Masayuki KIKAWA, Naoki TAKAHASHI
  • Patent number: 10065622
    Abstract: A second ECU determines whether or not there is an abnormality in a hydraulic-pressure sensor in a first cycle based on a detection value of the hydraulic-pressure sensor, and outputs a signal indicating a determination of an occurrence of the abnormality to a first ECU via a signal line when determining the occurrence of the abnormality in the hydraulic-pressure sensor. The first ECU receives the detection value of the hydraulic-pressure sensor through communication from the second ECU via the signal line to determine whether or not there is the abnormality in the hydraulic-pressure sensor in a second cycle that is shorter than the first cycle. When determining that the hydraulic-pressure sensor is abnormal, the first ECU controls driving of an electric actuator based on a braking command from an operation-amount detection sensor without using the detection value of the hydraulic-pressure sensor determined to be abnormal.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: September 4, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Masayuki Kikawa, Daisuke Goto, Kentaro Ueno, Toshiyuki Innami, Tatsuji Ohkubo
  • Patent number: 9463782
    Abstract: A brake control system which can maintain the behavior of a vehicle stable when wheels slip. A slip amount detector (56), configured to detect an amount of slip at the front and rear wheels, is connected to a second ECU (35). A first ECU (27) has a regenerative slip control unit which executes repeatedly a slip restricting control in which, while the front wheels are being detected as slipping based on a detection value of the slip amount detector during the execution of regenerative braking by a motor-generator (55), the amount of regenerative braking by the motor-generator is reduced by a predetermined amount, and thereafter, the resulting reduced amount of regenerative braking is held for a predetermined period of time. The regenerative slip control unit sets the predetermined reduction amount larger than a predetermined reduction amount by which the amount of regenerative braking is reduced in the slip restricting control.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: October 11, 2016
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Masayuki Kikawa, Shuji Ohshita, Norikazu Matsuzaki
  • Patent number: 9278676
    Abstract: According to the present invention, limited electric power is consumed so as to achieve long-lasting use of electric power during brake control with the use of an auxiliary power supply source when there is a malfunction of a vehicle power supply source. In addition, a brake control device for ensuring responsiveness at the beginning of braking or when emergency braking is necessary is provided. The brake control device of the present invention is a brake control device for detecting electric signals generated depending on the degree of brake-pedal operation and calculating the driver's demanded braking force based on the electric signals so as to generate the demanded braking force, which comprises an auxiliary power supply source for supplying electric power to the brake control device when there is a malfunction of a vehicle power supply source and controls braking depending on the charged capacity of the auxiliary power supply source.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: March 8, 2016
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kimio Nishino, Toshiyuki Innami, Norikazu Matsuzaki, Masayuki Kikawa, Ayumu Miyajima, Toshiyuki Ajima
  • Publication number: 20150217741
    Abstract: A brake control system is provided which can maintain, the behavior of a vehicle stable when wheels slip. A slip amount detector 56 configured to detect an amount of slip at wheels 2L, 2R, 3L, 3R is connected to a second ECU 35. A first ECU 27 has a regenerative slip control unit which executes repeatedly a slip restricting control in which while the front wheels 2L, 2R are being detected as slipping based on a detection value of the slip amount detector 56 during the execution of regenerative braking by a motor-generator 55, the amount of regenerative braking by the motor-generator 55 is reduced by a predetermined amount, and thereafter, the resulting reduced amount of regenerative braking is held for a predetermined period of time.
    Type: Application
    Filed: January 26, 2015
    Publication date: August 6, 2015
    Inventors: Masayuki KIKAWA, Shuji OHSHITA, Norikazu MATSUZAKI
  • Publication number: 20150061362
    Abstract: When a driving force of a drive motor (21) becomes a maximum driving force even in the case where a brake pedal (5) is depressed by a large amount while a vehicle is in a stopped state, a second ECU (33) outputs a valve-closing command to a boost control valve (40, 40?) of an ESC (31) for a left front wheel (FL; front wheel 1L) and a right front wheel (FR; front wheel 1R). In this manner, a hydraulic pressure flowing from a master cylinder (8) through the ESC (31) to each wheel side is not supplied to wheel cylinders (3L, 3R) for the front wheels (1L, 1R) but is supplied only to wheel cylinders (4L, 4R) for rear wheels (2L, 2R). A hydraulic stiffness of the wheel cylinders (3L, 3R, 4L, 4R) is changed by stopping supply of a brake fluid to the wheel cylinders (3L, 3R).
    Type: Application
    Filed: August 26, 2014
    Publication date: March 5, 2015
    Inventors: Masayuki KIKAWA, Norikazu MATSUZAKI, Kunihiro MATSUNAGA, Hiroshi SHIGETA, Kentaro UENO, Hiroshi FURUYAMA
  • Patent number: 8833869
    Abstract: A brake system which can secure quietness in a passenger compartment is provided. A vehicle brake system 1 includes a brake assist device 2 which boosts a pressing force on a brake pedal 5 by drive of a motor 31, and an assist control unit 6 which controls the motor 31. The assist control unit 6 changes responsiveness of the motor 31 in accordance with a vehicle speed, and sets a dead zone amount and a filtering value to large values in a region with a low vehicle speed. Thereby, responsiveness of a boosting operation of the motor 31 to the operation of the brake pedal is made low, and a rotational variation and a vibration are prevented from occurring to the motor 31 by a minute variation of a detection signal of a stroke sensor 14 during low-speed traveling or stoppage of traveling.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: September 16, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Norikazu Matsuzaki, Toshiyuki Innami, Kimio Nishino, Ayumu Miyajima, Toshiyuki Ajima, Masayuki Kikawa
  • Publication number: 20140095044
    Abstract: A second ECU determines whether or not there is an abnormality in a hydraulic-pressure sensor in a first cycle based on a detection value of the hydraulic-pressure sensor, and outputs a signal indicating determination of occurrence of the abnormality to a first ECU via signal line when determining occurrence of the abnormality in the sensor. The first ECU receives the detection value of the hydraulic-pressure sensor through communication from the second ECU via the signal line to determine whether or not there is the abnormality in the hydraulic-pressure sensor in a second cycle shorter than the first cycle. When determining that the hydraulic-pressure sensor is abnormal, the first ECU controls driving of an electric actuator based on a braking command from an operation-amount detection sensor without using the detection value of the hydraulic-pressure sensor determined as abnormal.
    Type: Application
    Filed: September 26, 2013
    Publication date: April 3, 2014
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Masayuki KIKAWA, Daisuke GOTO, Kentaro UENO, Toshiyuki INNAMI, Tatsuji OHKUBO
  • Patent number: 8538653
    Abstract: Disclosed is a brake control apparatus which includes a brake booster for augmenting deceleration, and which addresses the problem in conventional brake control apparatuses that deceleration and pedal reaction force depend on driver brake pedal input, and thus the pedal response and the ride comfort from the feeling of deceleration are affected by the manner in which the brake pedal is actuated by the driver. The brake control apparatus comprises a pedal reaction force generation unit for generating a pedal reaction force on the brake pedal, and a brake control unit for controlling the brake force in such a way as to suppress driver brake input fluctuations, wherein the pedal reaction force generation unit suppresses pedal reaction force fluctuations in accordance with specific deceleration and pedal reaction force characteristics.
    Type: Grant
    Filed: October 9, 2009
    Date of Patent: September 17, 2013
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ayumu Miyajima, Masatsugu Arai, Toshiyuki Innami, Kimio Nishino, Norikazu Matsuzaki, Masayuki Kikawa, Makoto Yamakado
  • Patent number: 8506020
    Abstract: A brake control system that enables accurate brake control is provided that precisely detects a master-cylinder pressure and includes a back-up function. The brake control system includes a master-cylinder operated by a brake operation of a driver; a first mechanism that regulates a pressure inside the master-cylinder according to the brake operation amount; a first control apparatus that controls operation of the first mechanism; a second mechanism that regulates communication of the pressure inside the master-cylinder to a wheel-cylinder; and a second control apparatus that controls operation of the second mechanism and operation of a pump apparatus that increases a pressure communicated to the wheel-cylinder. The first and second control apparatuses each have a power supply circuit and CPU.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: August 13, 2013
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kimio Nishino, Toshiyuki Innami, Norikazu Matsuzaki, Masayuki Kikawa, Takuya Obata, Takayuki Ohno
  • Patent number: 8447487
    Abstract: Disclosed is a brake control system including a plurality of control apparatuses using a brake operation amount detection apparatus and one brake operation amount detection apparatus. The brake control system includes: a master-cylinder pressure control apparatus that controls a master-cylinder pressure based on a brake operation amount; a wheel-cylinder pressure control apparatus that controls a wheel-cylinder pressure of each wheel; and a master-cylinder pressure detection apparatus that detects a signal for calculating the master-cylinder pressure, the master-cylinder pressure control apparatus controls the master-cylinder pressure based on a detection result detected by the master-cylinder pressure detection apparatus, and the wheel-cylinder pressure control apparatus controls the wheel-cylinder pressure based on the detection result detected by the master-cylinder pressure detection apparatus.
    Type: Grant
    Filed: August 12, 2010
    Date of Patent: May 21, 2013
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kimio Nishino, Toshiyuki Innami, Norikazu Matsuzaki, Masayuki Kikawa
  • Publication number: 20110316329
    Abstract: According to the present invention, limited electric power is consumed so as to achieve long-lasting use of electric power during brake control with the use of an auxiliary power supply source when there is a malfunction of a vehicle power supply source. In addition, a brake control device for ensuring responsivenss at the beginning of braking or when emergency braking is necessary is provided. The brake control device of the present invention is a brake control device for detecting electric signals generated depending on the degree of brake-pedal operation and calculating the driver's demanded braking force based on the electric signals so as to generate the demanded braking force, which comprises an auxiliary power supply source for supplying electric power to the brake control device when there is a malfunction of a vehicle power supply source and controls braking deppending on the charged capacity of the auxiliary power supply source.
    Type: Application
    Filed: February 25, 2010
    Publication date: December 29, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Kimio Nishino, Toshiyuki Innami, Norikazu Matsuzaki, Masayuki Kikawa, Ayumu Miyajima, Toshiyuki Ajima
  • Publication number: 20110202250
    Abstract: Disclosed is a brake control apparatus which includes a brake booster for augmenting deceleration, and which addresses the problem in conventional brake control apparatuses that deceleration and pedal reaction force depend on driver brake pedal input, and thus the pedal response and the ride comfort from the feeling of deceleration are affected by the manner in which the brake pedal is actuated by the driver. The brake control apparatus comprises a pedal reaction force generation unit for generating a pedal reaction force on the brake pedal, and a brake control unit for controlling the brake force in such a way as to suppress driver brake input fluctuations, wherein the pedal reaction force generation unit suppresses pedal reaction force fluctuations in accordance with specific deceleration and pedal reaction force characteristics.
    Type: Application
    Filed: October 9, 2009
    Publication date: August 18, 2011
    Inventors: Ayumu Miyajima, Masatsugu Arai, Toshiyuki Innami, Kimio Nishino, Norikazu Matsuzaki, Masayuki Kikawa, Makoto Yamakado
  • Patent number: 7980638
    Abstract: In a brake controller, a slope climbing vehicle stop detecting means determines when the vehicle is stopped while climbing a slope, and a pedal release detecting means determines that the pedal is released. An assist control unit interpolates a decrement in brake fluid pressure in the master cylinder due to an input piston movement caused by a release of a brake pedal. An assist piston is controlled by an electric motor to restore and maintain the fluid pressure within the master cylinder.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: July 19, 2011
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Norikazu Matsuzaki, Toshiyuki Innami, Kimio Nishino, Masayuki Kikawa
  • Publication number: 20110073419
    Abstract: In a brake controller, a slope climbing vehicle stop detecting means determines when the vehicle is stopped while climbing a slope, and a pedal release detecting means determines that the pedal is released. An assist control unit interpolates a decrement in brake fluid pressure in the master cylinder due to an input piston movement caused by a release of a brake pedal. An assist piston is controlled by an electric motor to restore and maintain the fluid pressure within the master cylinder.
    Type: Application
    Filed: August 13, 2010
    Publication date: March 31, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Norikazu MATSUZAKI, Toshiyuki Innami, Kimio Nishino, Masayuki Kikawa
  • Publication number: 20110077831
    Abstract: Disclosed is a brake control system including a plurality of control apparatuses using a brake operation amount detection apparatus and one brake operation amount detection apparatus. The brake control system includes: a master-cylinder pressure control apparatus that controls a master-cylinder pressure based on a brake operation amount; a wheel-cylinder pressure control apparatus that controls a wheel-cylinder pressure of each wheel; and a master-cylinder pressure detection apparatus that detects a signal for calculating the master-cylinder pressure, the master-cylinder pressure control apparatus controls the master-cylinder pressure based on a detection result detected by the master-cylinder pressure detection apparatus, and the wheel-cylinder pressure control apparatus controls the wheel-cylinder pressure based on the detection result detected by the master-cylinder pressure detection apparatus.
    Type: Application
    Filed: August 12, 2010
    Publication date: March 31, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Kimio NISHINO, Toshiyuki Innami, Norikazu Matsuzaki, Masayuki Kikawa
  • Publication number: 20110025119
    Abstract: A brake control system that enables accurate brake control is provided that precisely detects a master-cylinder pressure and includes a back-up function. The brake control system includes a master-cylinder operated by a brake operation of a driver; a first mechanism that regulates a pressure inside the master-cylinder according to the brake operation amount; a first control apparatus that controls operation of the first mechanism; a second mechanism that regulates communication of the pressure inside the master-cylinder to a wheel-cylinder; and a second control apparatus that controls operation of the second mechanism and operation of a pump apparatus that increases a pressure communicated to the wheel-cylinder. The first and second control apparatuses each have a power supply circuit and CPU.
    Type: Application
    Filed: February 18, 2010
    Publication date: February 3, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Kimio NISHINO, Toshiyuki Innami, Norikazu Matsuzaki, Masayuki Kikawa, Takuya Obata, Takayuki Ohno
  • Publication number: 20100253137
    Abstract: A brake system which can secure quietness in a passenger compartment is provided. A vehicle brake system 1 includes a brake assist device 2 which boosts a pressing force on a brake pedal 5 by drive of a motor 31, and an assist control unit 6 which controls the motor 31. The assist control unit 6 changes responsiveness of the motor 31 in accordance with a vehicle speed, and sets a dead zone amount and a filtering value to large values in a region with a low vehicle speed. Thereby, responsiveness of a boosting operation of the motor 31 to the operation of the brake pedal is made low, and a rotational variation and a vibration are prevented from occurring to the motor 31 by a minute variation of a detection signal of a stroke sensor 14 during low-speed traveling or stoppage of traveling.
    Type: Application
    Filed: February 18, 2010
    Publication date: October 7, 2010
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Norikazu MATSUZAKI, Toshiyuki Innami, Kimio Nishino, Ayumu Miyajima, Toshiyuki Ajima, Masayuki Kikawa