Patents by Inventor Kiyotaka Mamiya

Kiyotaka Mamiya 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: 8903582
    Abstract: A method of controlling a hybrid automobile is provided. Only a drive force of the motor is outputted to wheels by stopping the engine while operating the motor when a required drive force is below a predetermined switch value, and at least a drive force of the engine is outputted to the wheels by operating at least the engine when the required drive force is above the switch value. The method includes estimating, when the required drive force is below the switch value, a switching possibility of the required drive force increasing above the switch value, operating the engine so that a temperature of a catalyst becomes a first temperature when the estimated switching possibility is above a predetermined level, and operating the engine so that the temperature of the catalyst becomes a second temperature lower than the first temperature when the estimated switching possibility is below the predetermined level.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: December 2, 2014
    Assignee: Mazda Motor Corporation
    Inventors: Kiyotaka Mamiya, Tadayoshi Kaide, Minji Sakaki, Taizo Shoya, Kanichi Yamaguchi, Tetsuya Tateishi
  • Publication number: 20130231809
    Abstract: A method of controlling a hybrid automobile is provided. Only a drive force of the motor is outputted to wheels by stopping the engine while operating the motor when a required drive force is below a predetermined switch value, and at least a drive force of the engine is outputted to the wheels by operating at least the engine when the required drive force is above the switch value. The method includes estimating, when the required drive force is below the switch value, a switching possibility of the required drive force increasing above the switch value, operating the engine so that a temperature of a catalyst becomes a first temperature when the estimated switching possibility is above a predetermined level, and operating the engine so that the temperature of the catalyst becomes a second temperature lower than the first temperature when the estimated switching possibility is below the predetermined level.
    Type: Application
    Filed: February 13, 2013
    Publication date: September 5, 2013
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Kiyotaka Mamiya, Tadayoshi Kaide, Minji Sakaki, Taizo Shoya, Kanichi Yamaguchi, Tetsuya Tateishi
  • Patent number: 7524266
    Abstract: An engine starting system for a power train including an engine and an automatic transmission includes an engine stop/restart controller. The automatic transmission having special mode includes first and second planetary gear sets having respective sun gears, a turbine shaft, an output gear, a forward clutch and a 2-4 brake. The forward clutch sets the automatic transmission in a drive condition when engaged and in a neutral condition when disengaged. If the special mode is selected under conditions where the output gear is locked, the sun gear of the first planetary gear set is locked. During execution of automatic engine stop control operation, the engine stop/restart controller causes the automatic transmission to initiate a transfer to the special mode before fuel supply is interrupted and causes the forward clutch to completely engage at a specific point in time after the automatic transmission has completed the transfer to the special mode.
    Type: Grant
    Filed: September 15, 2006
    Date of Patent: April 28, 2009
    Assignee: Mazda Motor Corporation
    Inventors: Hidetoshi Nobumoto, Taizou Shoya, Takayuki Ueda, Kiyotaka Mamiya
  • Publication number: 20080243322
    Abstract: There are provided a driving-state determination device to determine a driving state of a hybrid vehicle, and a driving-source selection device to select a driving source from an engine a first motor generator, and a second motor generator based on determination of the driving-state determination device so as to provide the highest driving efficiency as a whole of the vehicle. Herein, the first and second motor generators are configured so that a high-efficiency driving operation area of the first motor generator is set on a higher-speed side relative to a high-efficiency driving operation area of the second motor generator. Accordingly, there can be provided a control device of a hybrid vehicle that can improve the driving efficiency as a whole of the vehicle properly.
    Type: Application
    Filed: February 26, 2008
    Publication date: October 2, 2008
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Hidetoshi NOBUMOTO, Kiyotaka Mamiya, Seiji Esaki, Taizou Shoya, Takayuki Ueda
  • Publication number: 20070078040
    Abstract: An engine starting system for a power train including an engine and an automatic transmission includes an engine stop/restart controller. The automatic transmission having special mode includes first and second planetary gear sets having respective sun gears, a turbine shaft, an output gear, a forward clutch and a 2-4 brake. The forward clutch sets the automatic transmission in a drive condition when engaged and in a neutral condition when disengaged. If the special mode is selected under conditions where the output gear is locked, the sun gear of the first planetary gear set is locked. During execution of automatic engine stop control operation, the engine stop/restart controller causes the automatic transmission to initiate a transfer to the special mode before fuel supply is interrupted and causes the forward clutch to completely engage at a specific point in time after the automatic transmission has completed the transfer to the special mode.
    Type: Application
    Filed: September 15, 2006
    Publication date: April 5, 2007
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Hidetoshi Nobumoto, Taizou Shoya, Takayuki Ueda, Kiyotaka Mamiya
  • Patent number: 7079941
    Abstract: An engine starting system includes a throttle valve, an alternator, an engine speed sensor and an electronic control unit (ECU). The ECU functionally includes an automatic engine stop controller for automatically stopping the engine by interrupting fuel injection when predefined automatic engine stop conditions are satisfied, and an automatic engine restart controller for automatically restarting the engine when predefined engine restart conditions are satisfied.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: July 18, 2006
    Assignee: Mazda Motor Corporation
    Inventors: Masayuki Tetsuno, Junichi Taga, Kiyotaka Mamiya, Hideki Hosoya
  • Publication number: 20050221952
    Abstract: An engine starting system includes a throttle valve, an alternator, an engine speed sensor and an electronic control unit (ECU). The ECU functionally includes an automatic engine stop controller for automatically stopping the engine by interrupting fuel injection when predefined automatic engine stop conditions are satisfied, and an automatic engine restart controller for automatically restarting the engine when predefined engine restart conditions are satisfied.
    Type: Application
    Filed: March 28, 2005
    Publication date: October 6, 2005
    Inventors: Masayuki Tetsuno, Junichi Taga, Kiyotaka Mamiya, Hideki Hosoya
  • Patent number: 6681739
    Abstract: A direct-injection spark-ignition engine in which a combustible mixture is produced around a spark plug at an ignition point by causing a tumble and a fuel spray to collide with each other in a combustion chamber during stratified charge combustion comprises a fuel pressure controller which controls fuel pressure such that penetration of the fuel spray from a fuel injector is progressively intensified with an increase in engine speed in a stratified charge combustion region and means for controlling fuel injection timing including an injection timing setter. The means for controlling fuel injection timing controls the injection timing in such a way that the interval between a fuel injection ending point and the ignition point becomes progressively shorter as engine speed increases under the same engine load conditions in the stratified charge combustion region.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: January 27, 2004
    Assignee: Mazda Motor Corporation
    Inventors: Kiyotaka Mamiya, Masayuki Tetsuno, Takeo Yamauchi, Noriyuki Ohta
  • Patent number: 6668792
    Abstract: In a control system for an in-cylinder direct injection engine, an actual port intake air density ganmap is calculated based on the intake air temperature thae and the atmospheric pressure atp, a reference port intake air density ganmap* corresponding to the current operating conditions of the engine is read out of a map and compared with the actual port intake air density ganmap, and a target fuel pressure or fuel injection timing is compensatorily modified based on the comparison result. This prevents fuel spray and the tumble from being thrown out of balance due to a change in intake air temperature or atmospheric pressure thereby providing suitable mixture stratification.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: December 30, 2003
    Assignee: Mazda Motor Corporation
    Inventors: Takeo Yamauchi, Masayuki Tetsuno, Kiyotaka Mamiya
  • Patent number: 6668791
    Abstract: In a control system for an in-cylinder direct injection engine, during idling operation, the fuel injection timing is compensated to the advance side for each cylinder so that the rate of change in crank angular velocity becomes smaller than a preset criterion while the fuel injection pressure of an injector is gradually reduced from a reference target fuel pressure to a preset lower limit. If the rate of change in crank angular speed becomes smaller than the criterion as a result of the above compensation, the fuel injection timing is compensated to the retard side so that the rate of change in crank angular velocity becomes smaller while the fuel pressure is gradually increased to the preset upper limit. Consequently, the unbalance of fuel spray and tumble due to deviations of fuel spray penetration and the like can be eliminated thereby providing suitable mixture stratification.
    Type: Grant
    Filed: March 12, 2002
    Date of Patent: December 30, 2003
    Assignee: Mazda Motor Corporation
    Inventors: Masayuki Tetsuno, Kiyotaka Mamiya, Takeo Yamauchi
  • Publication number: 20020189582
    Abstract: A direct-injection spark-ignition engine in which a combustible mixture is produced around a spark plug at an ignition point by causing a tumble and a fuel spray to collide with each other in a combustion chamber during stratified charge combustion comprises a fuel pressure controller which controls fuel pressure such that penetration of the fuel spray from a fuel injector is progressively intensified with an increase in engine speed in a stratified charge combustion region and means for controlling fuel injection timing including an injection timing setter. The means for controlling fuel injection timing controls the injection timing in such a way that the interval between a fuel injection ending point and the ignition point becomes progressively shorter as engine speed increases under the same engine load conditions in the stratified charge combustion region.
    Type: Application
    Filed: May 15, 2002
    Publication date: December 19, 2002
    Inventors: Kiyotaka Mamiya, Masayuki Tetsuno, Takeo Yamauchi, Noriyuki Ohta
  • Publication number: 20020134346
    Abstract: In a control system for an in-cylinder direct injection engine, an actual port intake air density ganmap is calculated based on the intake air temperature thae and the atmospheric pressure atp, a reference port intake air density ganmap* corresponding to the current operating conditions of the engine is read out of a map and compared with the actual port intake air density ganmap, and a target fuel pressure or fuel injection timing is compensatorily modified based on the comparison result. This prevents fuel spray and the tumble from being thrown out of balance due to a change in intake air temperature or atmospheric pressure thereby providing suitable mixture stratification.
    Type: Application
    Filed: March 15, 2002
    Publication date: September 26, 2002
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Takeo Yamauchi, Masayuki Tetsuno, Kiyotaka Mamiya
  • Publication number: 20020129785
    Abstract: In a control system for an in-cylinder direct injection engine, during idling operation, the fuel injection timing is compensated to the advance side for each cylinder so that the rate of change in crank angular velocity becomes smaller than a preset criterion while the fuel injection pressure of an injector is gradually reduced from a reference target fuel pressure to a preset lower limit. If the rate of change in crank angular speed becomes smaller than the criterion as a result of the above compensation, the fuel injection timing is compensated to the retard side so that the rate of change in crank angular velocity becomes smaller while the fuel pressure is gradually increased to the preset upper limit. Consequently, the unbalance of fuel spray and tumble due to deviations of fuel spray penetration and the like can be eliminated thereby providing suitable mixture stratification.
    Type: Application
    Filed: March 12, 2002
    Publication date: September 19, 2002
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Masayuki Tetsuno, Kiyotaka Mamiya, Takeo Yamauchi
  • Patent number: 6401703
    Abstract: A fuel injection control system for a direct injection-spark ignition type of engine forcibly turns off appliances as an external engine load while the engine operates in a stratified charge combustion mode after warming-up so as thereby to fix a quantity of intake air approximately constant and concurrently feedback controls a quantity of fuel injection according to an engine speed so as to bring the engine speed into a specified idling speed. An actual quantitative variation of fuel injection is learned on the basis of a feedback correction value of the quantity of fuel injection for each of predetermined fuel injection timings which are changed from a timing for minimum advance for best torque (MBT) so as to correspond to injection pulse widths within a region adopted for a micro-flow characteristic of the fuel injector.
    Type: Grant
    Filed: September 28, 2000
    Date of Patent: June 11, 2002
    Assignee: Mazda Motor Corporation
    Inventors: Kiyotaka Mamiya, Hiroyuki Yamamoto, Keiji Araki
  • Patent number: 6325041
    Abstract: Upon refreshing a catalyst (25) in steps SA2 to SA6, the air-fuel ratio of each combustion chamber (4) of an engine (1) is dither-controlled to periodically vary to the rich and lean sides of a target value (A/F=15 to 16) in steps SA16 and SA17. In step SA15, an injector (7) divisionally injects fuel in two injections within the period from the intake stroke to the compression stroke of each cylinder, thus accomplishing weakly stratified combustion. In step SA18, the opening of an EGR valve (27) is controlled to recirculate a large amount of exhaust gas to an intake path (10) so as to achieve around 40% EGR ratio.
    Type: Grant
    Filed: February 3, 2000
    Date of Patent: December 4, 2001
    Assignee: Mazda Motor Corporation
    Inventors: Kiyotaka Mamiya, Michihiro Imada, Takeo Yamauchi, Masayuki Tetsuno
  • Patent number: 6244243
    Abstract: A control device for controlling a direct injection engine provided with an injector for injecting fuel directly into a combustion chamber in a cylinder thereof and a throttle valve is switchable between a stratified charge combustion mode and a uniform charge combustion mode. The control device predicts switching to the uniform charge combustion mode based on a change in the target load Piobj during engine acceleration in the stratified charge combustion mode, and corrects the target load Piobj so that the opening of the throttle valve approaches the opening suited for the uniform charge combustion mode prior to the switching to the uniform charge combustion mode when such combustion mode switching has been predicted. This control device prevents torque shock due to the combustion mode switching during engine acceleration without causing a deterioration in fuel economy or in vehicle acceleration performance.
    Type: Grant
    Filed: January 11, 2000
    Date of Patent: June 12, 2001
    Assignee: Mazda Motor Corporation
    Inventors: Kiyotaka Mamiya, Michihiro Imada, Masayuki Tetsuno
  • Patent number: 6244241
    Abstract: A fuel injection control system for a direct injection-spark ignition engine determines an injection pulse width corresponding to a given quantity of fuel with which an injector is kept open, controls the injector to spray a given quantity of fuel in a compression stroke while the engine operates in a zone of lower engine loads specified for lean stratified charge combustion so that the fuel is stratified around an ignition plug to cause lean stratified charge combustion so as thereby to provide an air-fuel ratio greater than a stoichiometric air-fuel ratio, executes fuel injection feedback control to control a quantity of fuel injection based on an air-fuel ratio detected by an oxygen sensor, causes the injector to spray a given quantity of fuel through a plurality of intake stroke split injection in a specified engine operating zone in which the fuel injection feedback control is performed to maintain at least a stoichiometric air-fuel ratio while the engine operates with lower loads, learns a fuel injectio
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: June 12, 2001
    Assignee: Mazada Motor Corporation
    Inventors: Kiyotaka Mamiya, Michihiro Imada, Takeo Yamauchi, Masayuki Tetsuno
  • Patent number: 6234139
    Abstract: An engine control system for an engine equipped with a swirl control valve which is operative in operation modes different in fuel injection form according to engine operating conditions judges based on a change in an engine operating condition whether a mode shift to one operation mode to another is demanded and controls the swirl control valve so as to attain a target opening for the one engine operation mode while keeping a specific mode shift waiting until the swirl valve opening reaches a limit value permissible in one engine operation mode into which the specific mode shift is made when the swirl control valve is judged to be out of the limit value.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: May 22, 2001
    Assignee: Mazda Motor Corporation
    Inventors: Junichi Taga, Michihiro Imada, Masayuki Kuroki, Masayuki Tetsuno, Kiyotaka Mamiya, Hirofumi Nishimura
  • Patent number: 6178943
    Abstract: An engine control system for a direct injection-spark ignition type of engine determines a target load based on an engine speed and an accelerator pedal travel, determines target air-to-fuel ratio based on an amount of intake air and the target engine load, and determines an amount of fuel injection based on the target air-to-fuel ratio, so as thereby to control engine output torque balancing the target engine load even during a transitional operating state.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: January 30, 2001
    Assignee: Mazda Motor Corporation
    Inventors: Junichi Taga, Michihiro Imada, Masayuki Kuroki, Masayuki Tetsuno, Kiyotaka Mamiya, Hirofumi Nishimura
  • Patent number: 6079387
    Abstract: An air intake control system for an engine equipped with an exhaust gas recirculation feature controls an exhaust gas recirculation valve according to an amount of air charge dictated by an amount of intake air detected by an air flow sensor to deliver a target amount of air charge and control an amount of air charge meeting an estimated amount of air charge estimated under the condition that the control of exhaust gas recirculation valve according to an amount of air charge is interrupted.
    Type: Grant
    Filed: July 22, 1998
    Date of Patent: June 27, 2000
    Assignee: Mazda Motor Corporation
    Inventors: Kiyotaka Mamiya, Michihiro Imada, Takeo Yamauchi, Masayuki Tetsuno