Patents by Inventor Isamu Iizuka

Isamu Iizuka 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: 7527339
    Abstract: A brake control system for a motor vehicle comprising a brake control unit which controls increasing and decreasing of a brake pressure of a wheel cylinder from a pressure source by driving plural solenoid valves without a brake operation by a driver. The system comprises a flow back control unit which controls the brake pressure of a wheel cylinder to drive the plural solenoid valves before control by the brake control unit and returns the brake fluid to the pressure source from the wheel cylinder.
    Type: Grant
    Filed: September 6, 2005
    Date of Patent: May 5, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Isamu Iizuka, Motohiro Higuma
  • Publication number: 20060049687
    Abstract: A brake control system for a motor vehicle comprising a brake control unit which controls increasing and decreasing of a brake pressure of a wheel cylinder from a pressure source by driving plural solenoid valves without a brake operation by a driver. The system comprises a flow back control unit which controls the brake pressure of a wheel cylinder to drive the plural solenoid valves before control by the brake control unit and returns the brake fluid to the pressure source from the wheel cylinder.
    Type: Application
    Filed: September 6, 2005
    Publication date: March 9, 2006
    Inventors: Isamu Iizuka, Motohiro Higuma
  • Patent number: 6999864
    Abstract: In an internal combustion engine provided with a variable valve mechanism that variably controls at least an operating characteristic (valve lift amount and the like) of an intake valve, a valve opening area AWm at a valve overlap time is calculated based on a valve lift amount (VCS-ANGL) and opening timing IVO of the intake valve, and a spit-back gas amount Wm at the valve overlap time is calculated based on the valve opening area AWm. On the other hand, a volume flow ratio (basic actual engine volume flow ratio) RQH0VEL1 in the intake valve, equivalent to an actual intake air amount of the engine, is calculated based on the valve lift amount and closing timing of the intake valve, and a basic residual gas amount Wcyl is calculated based on the basic actual engine volume flow ratio RQH0VEL1. Then, a resultant obtained by adding the spit-back gas amount Wm and the basic residual gas amount Wcyl, is set as a total residual gas amount of the engine.
    Type: Grant
    Filed: July 14, 2003
    Date of Patent: February 14, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Isamu Iizuka, Kenichi Machida, Hirokazu Shimizu
  • Patent number: 6920851
    Abstract: In an internal combustion engine provided with a variable valve mechanism that varies a lift amount of an intake valve, when a target lift amount of the intake valve is a predetermined value or less, the target lift amount of the intake valve is limited to the predetermined value or above when the combustion variation reaches an allowable value or above.
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: July 26, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Machida, Makoto Nakamura, Hirokazu Shimizu, Isamu Iizuka
  • Patent number: 6863037
    Abstract: A controller that outputs control signals to an actuator of a variable valve timing mechanism is integrally equipped with a cam sensor that takes out from a camshaft signals for discriminating a cylinder corresponding to a reference piston position. The controller discriminates the cylinder corresponding to the reference piston position, computes a rotation phase of the camshaft relative to a crankshaft, and transmits the result of the cylinder discrimination process to an engine controller.
    Type: Grant
    Filed: June 11, 2002
    Date of Patent: March 8, 2005
    Assignee: Unisia Jecs Corporation
    Inventors: Isamu Iizuka, Hirokazu Shimizu
  • Patent number: 6863050
    Abstract: In an internal combustion engine provided with a variable valve mechanism that varies at least a valve operating characteristic (valve lift amount and the like) of an intake valve, a target intake air amount equivalent to a target torque is set based on operating conditions of the engine, to calculate a target volume flow ratio by dividing the target intake air amount by an engine rotation speed and total cylinder volume. The target volume flow ratio is corrected according to closing timing of the intake valve. If the valve lift amount of the intake valve is in a low valve lift region, the target volume flow ratio is further corrected according to the valve lift amount, and the post corrected target volume flow ratio is converted into a valve opening area of the intake valve to be set as a target valve opening area. Then, based on the target valve opening area, a target valve operating characteristic of the intake valve is set.
    Type: Grant
    Filed: July 14, 2003
    Date of Patent: March 8, 2005
    Assignee: Hitachi Unisia Automotive, Ltd.
    Inventors: Isamu Iizuka, Kenichi Machida
  • Patent number: 6851409
    Abstract: In an internal combustion engine provided with a variable valve mechanism that varies at least a valve operating characteristic (valve lift amount, valve operating angle and the like) of an intake valve, a target volume flow ratio equivalent to a target torque of the engine is obtained to be converted into a valve opening area, and a target valve operating characteristic of the variable valve mechanism is set based on the converted valve opening area, to control the variable valve mechanism so that an actual valve operating characteristic reaches a target valve operating angle, thereby executing with high accuracy an intake air amount control mainly by the variable valve mechanism.
    Type: Grant
    Filed: October 11, 2002
    Date of Patent: February 8, 2005
    Assignee: Hitachi Unisia Automotive, Ltd.
    Inventors: Kenichi Machida, Hirokazu Shimizu, Isamu Iizuka
  • Patent number: 6843230
    Abstract: In an internal combustion engine provided with a variable valve mechanism that varies a valve operating characteristic (valve lift amount and valve operating angle) of an intake valve, the valve operating characteristic of the intake valve is detected and an intake air amount controlled by the intake valve is calculated based on the detected valve operating characteristic. Then, a change (change rate, change amount) between the newest intake air amount calculation value and a past intake air amount calculation value is calculated, and the newest engine controlled variable is calculated based on the change and engine controlled variable (basic fuel injection quantity and the like) set in the past, and then the calculated newest engine controlled variable is output for executing an engine control.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: January 18, 2005
    Assignee: Hitachi Unisia Automotive, Ltd.
    Inventors: Isamu Iizuka, Kenichi Machida
  • Patent number: 6805096
    Abstract: Cylinder judgment signals are output from cam sensors at every uneven crank angle interval. The number of cylinder judgment signals output per cam sensor during a time period between a previous output and a present output of cylinder judgment signals from the other cam sensor, is counted up, to judge a specific cylinder based on the number of outputs. As a result, cylinders other than the specific cylinder are judged based on the judgment result and the cylinder judgment signals. Simultaneously, a time period from the previous cylinder judgment to the present cylinder judgment is calculated, to judge erroneous detection of cylinder judgment signal due to noise based on a ratio between a previous calculation value and a present calculation value of the time period. When the erroneous detection is judged, the cylinder judgment result based on the cylinder judgment signals is canceled.
    Type: Grant
    Filed: June 18, 2002
    Date of Patent: October 19, 2004
    Assignee: Unisia Jecs Corporation
    Inventor: Isamu Iizuka
  • Publication number: 20040182341
    Abstract: In an internal combustion engine provided with a variable valve mechanism that varies a lift amount of an intake valve, when a target lift amount of the intake valve is a predetermined value or less, the target lift amount of the intake valve is limited to the predetermined value or above when the combustion variation reaches an allowable value or above.
    Type: Application
    Filed: December 9, 2003
    Publication date: September 23, 2004
    Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.
    Inventors: Kenichi Machida, Makoto Nakamura, Hirokazu Shimizu, Isamu Iizuka
  • Publication number: 20040129250
    Abstract: In an internal combustion engine provided with a variable valve mechanism that varies a valve operating characteristic (valve lift amount and valve operating angle) of an intake valve, the valve operating characteristic of the intake valve is detected and an intake air amount controlled by the intake valve is calculated based on the detected valve operating characteristic. Then, a change (change rate, change amount) between the newest intake air amount calculation value and a past intake air amount calculation value is calculated, and the newest engine controlled variable is calculated based on the change and engine controlled variable (basic fuel injection quantity and the like) set in the past, and then the calculated newest engine controlled variable is output for executing an engine control.
    Type: Application
    Filed: December 19, 2003
    Publication date: July 8, 2004
    Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.
    Inventors: Isamu Iizuka, Kenichi Machida
  • Publication number: 20040007194
    Abstract: In an internal combustion engine provided with a variable valve mechanism that varies at least a valve operating characteristic (valve lift amount and the like) of an intake valve, a target intake air amount equivalent to a target torque is set based on operating conditions of the engine, to calculate a target volume flow ratio by dividing the target intake air amount by an engine rotation speed and total cylinder volume. The target volume flow ratio is corrected according to closing timing of the intake valve. If the valve lift amount of the intake valve is in a low valve lift region, the target volume flow ratio is further corrected according to the valve lift amount, and the post corrected target volume flow ratio is converted into a valve opening area of the intake valve to be set as a target valve opening area. Then, based on the target valve opening area, a target valve operating characteristic of the intake valve is set.
    Type: Application
    Filed: July 14, 2003
    Publication date: January 15, 2004
    Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.
    Inventors: Isamu Iizuka, Kenichi Machida
  • Patent number: 6612274
    Abstract: An open-close characteristic of an intake valve is controlled so that a target intake air amount for an engine can be obtained, and also a retarded angle limitation of closing timing of an exhaust valve is set based on opening timing of the intake valve, to control an open-close characteristic of the exhaust valve so that the closing timing of the exhaust valve becomes a more advance angle side than the retarded angle limitation.
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: September 2, 2003
    Assignee: Hitachi Unisia Automotive, Ltd.
    Inventors: Isamu Iizuka, Satoru Watanabe
  • Publication number: 20030079703
    Abstract: An open-close characteristic of an intake valve is controlled so that a target intake air amount for an engine can be obtained, and also a retarded angle limitation of closing timing of an exhaust valve is set based on opening timing of the intake valve, to control an open-close characteristic of the exhaust valve so that the closing timing of the exhaust valve becomes a more advance angle side than the retarded angle limitation.
    Type: Application
    Filed: October 25, 2002
    Publication date: May 1, 2003
    Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.
    Inventors: Isamu Iizuka, Satoru Watanabe
  • Publication number: 20030075151
    Abstract: In an internal combustion engine provided with a variable valve mechanism that varies at least a valve operating characteristic (valve lift amount, valve operating angle and the like) of an intake valve, a target volume flow ratio equivalent to a target torque of the engine is obtained to be converted into a valve opening area, and a target valve operating characteristic of the variable valve mechanism is set based on the converted valve opening area, to control the variable valve mechanism so that an actual valve operating characteristic reaches a target valve operating angle, thereby executing with high accuracy an intake air amount control mainly by the variable valve mechanism.
    Type: Application
    Filed: October 11, 2002
    Publication date: April 24, 2003
    Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.
    Inventors: Kenichi Machida, Hirokazu Shimizu, Isamu Iizuka
  • Publication number: 20020194903
    Abstract: Cylinder judgment signals are output from a plurality of cam sensors at every uneven crank angle interval. The number of cylinder judgment signals output from one cam sensor during a time of period between a previous output and a present output of cylinder judgment signals from the other cam sensor, is counted up, to judge a specific cylinder based on the number of outputs, so that cylinders other than the specific cylinder are judged based on the judgment result and the cylinder judgment signals, and at the same time, each time the cylinder is judged by the above method, a period of from the previous cylinder judgment to the present cylinder judgment is calculated, to judge erroneous detection of cylinder judgment signal due to noise based on a ratio between a previous calculation value and a present calculation value of the period, and when the erroneous detection is judged, the cylinder judgment result based on the cylinder judgment signals is canceled.
    Type: Application
    Filed: June 18, 2002
    Publication date: December 26, 2002
    Applicant: UNISIA JECS CORPORATION
    Inventor: Isamu IIzuka
  • Publication number: 20020189562
    Abstract: A controller that outputs control signals to an actuator of a variable valve timing mechanism is integrally equipped with a cam sensor that takes out from a camshaft signals for discriminating a cylinder corresponding to a reference piston position. The controller discriminates the cylinder corresponding to the reference piston position, computes a rotation phase of the camshaft relative to a crankshaft, and transmits the result of the cylinder discrimination process to an engine controller.
    Type: Application
    Filed: June 11, 2002
    Publication date: December 19, 2002
    Applicant: UNISIA JECS CORPORATION
    Inventors: Isamu Iizuka, Hirokazu Shimizu
  • Patent number: 6484676
    Abstract: The reference valve timing of an intake valve and an exhaust valve is set based on an engine load detected and an engine rotation speed detected. An engine start and an engine idling condition are detected. The valve timing of the intake valve and the exhaust valve is controlled, while maintaining valve overlap amounts to be substantially the same, so that a valve overlap center becomes at an advance side from an exhaust top dead center, with respect to the reference valve timing, at the engine start and in the idling condition during a predetermined period of time after the engine start.
    Type: Grant
    Filed: June 25, 2001
    Date of Patent: November 26, 2002
    Assignee: Unisia Jecs Corporation
    Inventors: Hirokazu Shimizu, Isamu Iizuka
  • Publication number: 20020000212
    Abstract: The reference valve timing of an intake valve and an exhaust valve is set based on an engine load detected and an engine rotation speed detected. An engine start and an engine idling condition are detected. The valve timing of the intake valve and the exhaust valve is controlled, while maintaining valve overlap amounts to be substantially the same, so that a valve overlap center becomes at an advance side from an exhaust top dead center, with respect to the reference valve timing, at the engine start and in the idling condition during a predetermined period of time after the engine start.
    Type: Application
    Filed: June 25, 2001
    Publication date: January 3, 2002
    Applicant: UNISIA JECS CORPORATION
    Inventors: Hirokazu Shimizu, Isamu Iizuka