Patents by Inventor Masayuki Kita

Masayuki Kita 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: 20050121010
    Abstract: An air-fuel ratio sensor detects an air-fuel ratio of an exhaust gas at a confluent portion of an exhaust gas. An air-fuel ratios in each cylinder are estimated to be controlled based on an output of the air-fuel ratio sensor. A computer determines whether an air-fuel detecting timing deviates according to a dispersion of the estimated air-fuel ratio among cylinders. When the deviation is detected, the air-fuel ratio detecting timing is varied to estimate an air-fuel ratio before and after correcting amount of fuel. The air-fuel ratio detecting timing is adapted as a proper timing when the variation amount of the estimated air-fuel ratio before and after the correction of fuel amount corresponds to the correct amount of fuel.
    Type: Application
    Filed: December 2, 2004
    Publication date: June 9, 2005
    Applicant: DENSO CORPORATION
    Inventors: Masayuki Kita, Noriaki Ikemoto
  • Patent number: 6830043
    Abstract: A secondary air supply abnormality detection system determines that an abnormality is generated in a system including a secondary air supply system if a true secondary air flow rate is out of a predetermined range. The true secondary air flow rate is calculated by subtracting a secondary air flow rate average at the time when an air pump is not operating from another secondary air flow rate average at the time when the air pump is operating. Thus, variation in the secondary air flow rate due to change with time or production tolerance can be suitably corrected. Since calculation accuracy of the true secondary air flow rate is improved, determination accuracy of the abnormality in the system including the secondary air supply system can be improved.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: December 14, 2004
    Assignee: Denso Corporation
    Inventors: Shujirou Morinaga, Kenichi Sago, Satoshi Kodou, Kenichi Fujiki, Masayuki Kita
  • Publication number: 20040172934
    Abstract: When a specified air-fuel ratio F/B control condition is established during supply of a secondary air provided, an air-fuel ratio F/B control is executed, and at this time, an initial value of a target air-fuel ratio is set to a before-catalyst air-fuel ratio detected by an A/F (air-fuel ratio) sensor. The target air-fuel ratio subsequent to this is gradually changed from the initial value to a specified air-fuel ratio. By this, the initial value of the target air-fuel ratio can be suitably set at a start time of execution of the air-fuel ratio F/B control during the supply of the secondary air. The target air-fuel ratio subsequent to this is gradually changed to a stoichiometric air-fuel ratio, so that a change in engine rotation speed is suppressed and the drivability can be improved.
    Type: Application
    Filed: March 4, 2004
    Publication date: September 9, 2004
    Applicant: Denso Corporation
    Inventors: Masayuki Kita, Toru Noma, Kenichi Fujiki, Tomoyuki Takagawa
  • Publication number: 20040148926
    Abstract: A secondary air supply abnormality detection system determines that an abnormality is generated in a system including a secondary air supply system if a true secondary air flow rate is out of a predetermined range. The true secondary air flow rate is calculated by subtracting a secondary air flow rate average at the time when an air pump is not operating from another secondary air flow rate average at the time when the air pump is operating. Thus, variation in the secondary air flow rate due to change with time or production tolerance can be suitably corrected. Since calculation accuracy of the true secondary air flow rate is improved, determination accuracy of the abnormality in the system including the secondary air supply system can be improved.
    Type: Application
    Filed: December 24, 2003
    Publication date: August 5, 2004
    Applicant: DENSO CORPORATION
    Inventors: Shujirou Morinaga, Kenichi Sago, Satoshi Kodou, Kenichi Fujiki, Masayuki Kita
  • Publication number: 20040140788
    Abstract: The present invention provides an electric power steering device enabled to compensate for the influence of the inertia of a steering-assisting-force generating motor on steering with accurate timing even when a steering direction is reversed at high speed. Based on steering torque and a rotation angular speed of a steering-assisting-force generating motor, a steering angular acceleration correspondence value is obtained. The device has means for regulating a gain, which is multiplied to a change acceleration of the steering torque. The motor is controlled so that the steering assisting force is corrected according to a motor output correction value obtained on the basis of the relation between the motor output correction value and the steering angular acceleration correspondence value, which is preliminarily determined and stored in such a way as to compensate for the influence of the inertia on steering, and the obtained steering angular acceleration correspondence value.
    Type: Application
    Filed: October 30, 2003
    Publication date: July 22, 2004
    Applicant: Koyo Seiko Co., Ltd.
    Inventors: Terutaka Tamaizumi, Yoshinobu Shimizu, Shinya Aono, Akihiro Nishiyama, Takanobu Takamatsu, Masayuki Kita, Tomoyuki Yamauchi
  • Patent number: 6591183
    Abstract: An intermediate target value calculating unit calculates an intermediate target value &phgr;midtg(i) on the basis of an output &phgr;(i−1) of an A/F ratio sensor in computation of last time and a final target value &phgr;tg(i). By the computation, the intermediate target value &phgr;midtg(i) is set between the output &phgr;(i−1) of the A/F ratio sensor in computation of last time and the final target value &phgr;tg(i). A correction amount calculating unit calculates a correction amount AFcomp(i) of the target A/F ratio on the basis of a deviation &Dgr;&phgr;(i) between the intermediate target value &phgr;midtg(i) and the output &phgr;(i) of the A/F ratio sensor. Consequently, the control is hard to be influenced by variations in waste time of the subject to be controlled and an error in modeling. While maintaining the stability of the A/F ratio feedback control, higher gain can be achieved and robustness can be also increased.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: July 8, 2003
    Assignee: Denso Corporation
    Inventors: Yosuke Ishikawa, Katsuhiko Kawai, Masayuki Kita
  • Publication number: 20020038177
    Abstract: An intermediate target value calculating unit calculates an intermediate target value &phgr;midtg(i) on the basis of an output &phgr;(i=1) of an A/F ratio sensor in computation of last time and a final target value &phgr;tg(i). By the computation, the intermediate target value &phgr;midtg(i) is set between the output &phgr;(i−1) of the A/F ratio sensor in computation of last time and the final target value &phgr;tg(i). A correction amount calculating unit calculates a correction amount AFcomp(i) of the target A/F ratio on the basis of a deviation &Dgr;&phgr;(i) between the intermediate target value &phgr;midtg(i) and the output &phgr;(i) of the A/F ratio sensor. Consequently, the control is hard to be influenced by variations in waste time of the subject to be controlled and an error in modeling. While maintaining the stability of the A/F ratio feedback control, higher gain can be achieved and robustness can be also increased.
    Type: Application
    Filed: April 20, 2001
    Publication date: March 28, 2002
    Inventors: Yosuke Ishikawa, Katsuhiko Kawai, Masayuki Kita