Patents by Inventor Norikazu Matsuzaki

Norikazu Matsuzaki 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
  • Publication number: 20200262409
    Abstract: An electric booster including an input member that is advanceably/retractably moved according to a brake pedal operation. An electric motor of an electric actuator advanceably/retractably moves a power piston. A master pressure control unit sets a target movement amount of the power piston according to an amount of a movement of the input member that is caused by the brake pedal, and controls the electric motor to move the power piston so as to achieve the target movement amount, thereby causing a brake hydraulic pressure to be generated in a master cylinder. The master pressure control unit includes a reaction force generation portion, which changes a characteristic of a hydraulic reaction force applied to the brake pedal. The reaction force generation portion corrects the target movement amount of the power piston according to a temporal change in the movement amount of the input member.
    Type: Application
    Filed: September 18, 2018
    Publication date: August 20, 2020
    Inventors: Naoki TAKAHASHI, Daisuke GOTO, Takaya TSUKAGOSHI, Norikazu MATSUZAKI, Hiroaki SATO
  • Patent number: 10407039
    Abstract: Even when downstream stiffness in a brake hydraulic circuit changes due to variation in a caliper forming a part of a wheel cylinder, temperature, wear degree, and deterioration of a frictional pad, and/or the like, a brake control apparatus performs calculation processing for calculating a switching reference operation amount, switching operation amount deviation calculation processing for calculating a deviation from the switching reference operation amount, operation amount offset processing for offsetting a pedal operation amount detected by an operation amount detection unit, target hydraulic pressure calculation processing for calculating the target hydraulic pressure with use of the offset operation amount and a reference hydraulic characteristic, and control of the electric motor (21) according to the target hydraulic pressure.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: September 10, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Minoru Kishi, Norikazu Matsuzaki
  • Patent number: 10259438
    Abstract: A brake control device capable of suppressing a sense of discomfort felt by a driver. The brake control device (31) includes a braking command addition part (34A) for adding an automatic-brake braking command value (B) output from an automatic-brake braking command calculation part (32) and a pedal operation braking command value (A) output from a pedal operation braking command calculation part (34B). The pedal operation braking command calculation part includes a pedal operation braking command selection part (34B1), a normal brake characteristic part (34B2) for holding a normal brake characteristic, and an automatic brake characteristic part (34B3) for holding an automatic brake characteristic. The pedal operation braking command selection part selects a braking command value output from the automatic brake characteristic part when the automatic-brake braking command value is more than 0, and outputs the selection result to the braking command addition part as the pedal operation braking command value.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: April 16, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Daisuke Goto, Norikazu Matsuzaki
  • Publication number: 20180105156
    Abstract: Even when downstream stiffness in a brake hydraulic circuit changes due to variation in a caliper forming a part of a wheel cylinder, temperature, wear degree, and deterioration of a frictional pad, and/or the like, a brake control apparatus performs calculation processing for calculating a switching reference operation amount, switching operation amount deviation calculation processing for calculating a deviation from the switching reference operation amount, operation amount offset processing for offsetting a pedal operation amount detected by an operation amount detection unit, target hydraulic pressure calculation processing for calculating the target hydraulic pressure with use of the offset operation amount and a reference hydraulic characteristic, and control of the electric motor (21) according to the target hydraulic pressure.
    Type: Application
    Filed: March 18, 2016
    Publication date: April 19, 2018
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Minoru KISHI, Norikazu MATSUZAKI
  • Publication number: 20170297547
    Abstract: A brake control device capable of suppressing a sense of discomfort felt by a driver. The brake control device (31) includes a braking command addition part (34A) for adding an automatic-brake braking command value (B) output from an automatic-brake braking command calculation part (32) and a pedal operation braking command value (A) output from a pedal operation braking command calculation part (34B). The pedal operation braking command calculation part includes a pedal operation braking command selection part (34B1), a normal brake characteristic part (34B2) for holding a normal brake characteristic, and an automatic brake characteristic part (34B3) for holding an automatic brake characteristic. The pedal operation braking command selection part selects a braking command value output from the automatic brake characteristic part when the automatic-brake braking command value is more than 0, and outputs the selection result to the braking command addition part as the pedal operation braking command value.
    Type: Application
    Filed: March 18, 2016
    Publication date: October 19, 2017
    Inventors: Daisuke GOTO, Norikazu MATSUZAKI
  • 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
  • Patent number: 9143065
    Abstract: A motor drive device inputs two detection signals from a rotation position sensor thereby to detect a rotation position, and controls a voltage to be applied to a motor according to the detected rotation position. The motor drive device has a control unit for outputting a first voltage in a first state in which the square sum of sampling values sampled from the two detection signals is a predetermined value, and outputting a second voltage in a second state in which the square sum is not the predetermined value.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: September 22, 2015
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Toshiyuki Ajima, Norikazu Matsuzaki, Kentaro Ueno, Masaru Sakuma
  • 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
  • Patent number: 8672808
    Abstract: Provided is a brake control apparatus for a vehicle which detects an amount of brake-pedal operation by means of an electric signal, and then calculates a braking force demanded by a driver from the electric signal, and thereby generates the demanded braking force. A control mode for a braking force is switched from a normal control mode to a stationary-vehicle control mode, if a determination that the vehicle is in a stationary state is followed by another determination that an electric signal corresponding to an actual braking force exceeds a command value for a stationary-vehicle braking force while the vehicle is in the stationary state. The control mode for a braking force is switched from the stationary-vehicle control mode to the normal control mode, if it is determined that the demanded braking force becomes smaller than the command value for the stationary-vehicle braking force.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: March 18, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kimio Nishino, Toshiyuki Innami, Norikazu Matsuzaki, Shingo Nasu, Ayumu Miyajima
  • Publication number: 20140035493
    Abstract: A motor drive device inputs two detection signals from a rotation position sensor thereby to detect a rotation position, and controls a voltage to be applied to a motor according to the detected rotation position. The motor drive device has a control unit for outputting a first voltage in a first state in which the square sum of sampling values sampled from the two detection signals is a predetermined value, and outputting a second voltage in a second state in which the square sum is not the predetermined value.
    Type: Application
    Filed: April 25, 2011
    Publication date: February 6, 2014
    Inventors: Toshiyuki Ajima, Norikazu Matsuzaki, Kentaro Ueno, Masaru Sakuma
  • 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
  • Patent number: 8056660
    Abstract: A vehicle can ensure an engine torque the driver desires even though the load torque of a generator with respect to the engine varies, and in particular can restrain occurrence of such a risk that an engine stall occurs when a load to the engine is large upon, for example, engagement of a clutch. A controller predicts a load torque of the generator with respect to the engine in future several hundred milliseconds at maximum from the present time, in view of a magnetic field voltage and a speed of the generator at the present time, and controls the engine in accordance with the predicted load torque in order to prevent the output torque of the engine from being insufficient.
    Type: Grant
    Filed: December 14, 2006
    Date of Patent: November 15, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Shinya Imura, Norikazu Matsuzaki, Masaru Ito, Shin Fujiwara, Tatsuyuki Yamamoto
  • 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