Patents by Inventor Nobuyori Nakajima

Nobuyori Nakajima 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: 9461575
    Abstract: A rotary electric machine control apparatus controlling drive of a rotary electric machine includes a pre-limit d-axis voltage arithmetic portion calculating a pre-limit d-axis voltage command value; a pre-limit q-axis voltage arithmetic portion calculating a pre-limit q-axis voltage command value; a d-axis limit portion calculating a d-axis voltage command value; and a q-axis limit portion calculating a q-axis voltage command value. When an absolute value of the pre-limit q-axis voltage command value is greater than an absolute value of a second limit value, and an absolute value of a previous q-axis voltage command value is equal to or greater than the absolute value of the second limit value and is equal to or less than an absolute value of a first limit value, the q-axis limit portion determines a previous q-axis voltage command value as the q-axis voltage command value.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: October 4, 2016
    Assignee: DENSO CORPORATION
    Inventors: Hiroyasu Ootake, Nobuyori Nakajima, Takafumi Satou
  • Publication number: 20160181954
    Abstract: A motor control apparatus operates a power conversion circuit connected between a direct current power source and a motor, which performs mutual conversion between power at the direct current power source and power at the motor in response to a powering operation and a regenerative operation carried out by the motor. The motor control apparatus includes: a voltage command calculator that calculates a voltage command to the power conversion circuit; a suppression gain calculator that calculates a suppression gain such that an absolute value of an estimation value of a power source current or an absolute value of a detection value of the power source current is not more than a target value; and a voltage command suppressor that suppresses a voltage command by multiplying the suppression gain to the voltage command calculated by the voltage command calculator. Additionally, the suppression gain is within a range of 0 to 1.
    Type: Application
    Filed: December 18, 2015
    Publication date: June 23, 2016
    Inventors: Takafumi Satou, Nobuyori Nakajima, Haruo Suzuki
  • Publication number: 20160056745
    Abstract: A rotary electric machine control apparatus controlling drive of a rotary electric machine includes a pre-limit d-axis voltage arithmetic portion calculating a pre-limit d-axis voltage command value; a pre-limit q-axis voltage arithmetic portion calculating a pre-limit q-axis voltage command value; a d-axis limit portion calculating a d-axis voltage command value; and a q-axis limit portion calculating a q-axis voltage command value. When an absolute value of the pre-limit q-axis voltage command value is greater than an absolute value of a second limit value, and an absolute value of a previous q-axis voltage command value is equal to or greater than the absolute value of the second limit value and is equal to or less than an absolute value of a first limit value, the q-axis limit portion determines a previous q-axis voltage command value as the q-axis voltage command value.
    Type: Application
    Filed: August 17, 2015
    Publication date: February 25, 2016
    Inventors: Hiroyasu Ootake, Nobuyori Nakajima, Takafumi Satou
  • Patent number: 7645210
    Abstract: In executing an ETC cooperative downshift operation based on a driver's intent to decelerate, this system executes an engine output increasing control (e.g. a combination of a throttle opening control and a fuel injection restoring control) for increasing the engine output irrespective of driver's accelerator operation. At the timing a reduction amount in an input shaft rotational speed Nt exceeds a predetermined value K after the ETC cooperative downshift control is started, it is presumed that the hydraulic pressure of a to-be-disengaged clutch is already reduced to a hydraulic pressure level equivalent to a predetermined transmission torque capacity that causes no undesirable acceleration or shock even if the engine output increasing control is started. And, under such assumption, the engine output increasing control is started at this timing.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: January 12, 2010
    Assignee: DENSO Corporation
    Inventors: Nobuyori Nakajima, Takaji Murakawa, Tetsuji Kozaki
  • Patent number: 7635316
    Abstract: A hydraulic pressure of each corresponding one of a plurality of friction elements of a gear shift mechanism of the automatic transmission is controlled to downshift the gear shift mechanism from a current gear stage to a next gear stage, at which an engine brake is operated, upon receiving a driver's demand for deceleration. An engine output of the engine is increased by increasing a throttle opening degree of the engine in at least two steps in an absence of a driver's operation on an accelerator of the vehicle at the time of the downshifting of the gear shift mechanism from the current gear stage to the next gear stage.
    Type: Grant
    Filed: March 16, 2007
    Date of Patent: December 22, 2009
    Assignee: Denso Corporation
    Inventors: Nobuyori Nakajima, Takaji Murakawa, Tetsuji Kozaki
  • Patent number: 7503873
    Abstract: In executing an ETC cooperative downshift operation based on a driver's intent to decelerate, this system executes an engine output increasing control (e.g. a combination of a throttle opening control and a fuel injection restoring control) for increasing the engine output irrespective of driver's accelerator operation. At the timing a reduction amount in an input shaft rotational speed Nt exceeds a predetermined value K after the ETC cooperative downshift control is started, it is presumed that the hydraulic pressure of a to-be-disengaged clutch is already reduced to a hydraulic pressure level equivalent to a predetermined transmission torque capacity that causes no undesirable acceleration or shock even if the engine output increasing control is started. And, under such assumption, the engine output increasing control is started at this timing.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: March 17, 2009
    Assignee: Denso Corporation
    Inventors: Nobuyori Nakajima, Takaji Murakawa, Tetsuji Kozaki
  • Publication number: 20080207394
    Abstract: In executing an ETC cooperative downshift operation based on a driver's intent to decelerate, this system executes an engine output increasing control (e.g. a combination of a throttle opening control and a fuel injection restoring control) for increasing the engine output irrespective of driver's accelerator operation. At the timing a reduction amount in an input shaft rotational speed Nt exceeds a predetermined value K after the ETC cooperative downshift control is started, it is presumed that the hydraulic pressure of a to-be-disengaged clutch is already reduced to a hydraulic pressure level equivalent to a predetermined transmission torque capacity that causes no undesirable acceleration or shock even if the engine output increasing control is started. And, under such assumption, the engine output increasing control is started at this timing.
    Type: Application
    Filed: April 25, 2008
    Publication date: August 28, 2008
    Applicant: DENSO CORPORATION
    Inventors: Nobuyori Nakajima, Takaji Murakawa, Tetsuji Kozaki
  • Patent number: 7314428
    Abstract: An automotive automatic transmission control system is provided which is designed to increase the output of an engine in response to a driver's request to downshift a transmission for setting up the engine braking and to load the amount of working fluid to an on-coming clutch quickly during the downshift. The system works to determine whether the loaded amount of working fluid is excessive or lacking using the speeds of an input shaft of the transmission and the engine to correct the amount of working fluid to be used upon a subsequent downshift request. The use of the two speeds enables the fact that the loaded fluid amount is excessive which arises from a rise in the speed of the input shaft caused by the engine output increasing control, not by completion of the loading of the working fluid to the on-coming clutch to be found accurately.
    Type: Grant
    Filed: December 1, 2005
    Date of Patent: January 1, 2008
    Assignee: Denso Corporation
    Inventors: Nobuyori Nakajima, Takaji Murakawa, Tetsuji Kozaki
  • Patent number: 7285071
    Abstract: An automotive automatic transmission control apparatus is provided which works to increase the power of an engine in response to a request to down-shift the gear of an automatic transmission for developing the engine braking. The control apparatus includes a fail-safe circuit working to stop increasing the power of the engine when a defect in operation of a transmission hydraulic control circuit is detected after the hydraulic control circuit starts to control the hydraulic pressures to achieve the downshift of the automatic transmission. This eliminates or alleviates a problem, such as unwanted acceleration of the vehicle during the control of the downshift in the transmission.
    Type: Grant
    Filed: August 19, 2005
    Date of Patent: October 23, 2007
    Assignee: Denso Corporation
    Inventors: Nobuyori Nakajima, Takaji Murakawa, Tetsuji Kozaki
  • Publication number: 20070225115
    Abstract: A hydraulic pressure of each corresponding one of a plurality of friction elements of a gear shift mechanism of the automatic transmission is controlled to downshift the gear shift mechanism from a current gear stage to a next gear stage, at which an engine brake is operated, upon receiving a driver's demand for deceleration. An engine output of the engine is increased by increasing a throttle opening degree of the engine in at least two steps in an absence of a driver's operation on an accelerator of the vehicle at the time of the downshifting of the gear shift mechanism from the current gear stage to the next gear stage.
    Type: Application
    Filed: March 16, 2007
    Publication date: September 27, 2007
    Applicant: DENSO CORPORATION
    Inventors: Nobuyori Nakajima, Takaji Murakawa, Tetsuji Kozaki
  • Patent number: 7099763
    Abstract: A vehicle speed memory unit stores a vehicle speed at a prior predetermined time, the vehicle speed being calculated from an interval of the vehicle speed pulse. A first rapid deceleration detecting section compares an elapsed time from a time the vehicle speed pulse signal is inputted, measured by an elapsed time measuring unit, with a pulse interval corresponding to a predetermined deceleration relative to a vehicle speed stored by the vehicle speed memory unit, or a second rapid deceleration detecting section calculates an undetermined vehicle speed from the elapsed time measured by the elapsed time measuring unit, and calculates a deceleration from the undetermined vehicle speed and the vehicle speed at the prior predetermined time, and compares the calculated deceleration with a predetermined deceleration threshold value. Thus, rapid vehicle deceleration can immediately be determined at the present time without waiting for the determination of the vehicle speed after input of the next pulse signal.
    Type: Grant
    Filed: September 24, 2003
    Date of Patent: August 29, 2006
    Assignee: Jatco LTD
    Inventors: Masami Tanaka, Nobuyori Nakajima
  • Publication number: 20060135315
    Abstract: An automotive automatic transmission control system is provided which is designed to increase the output of an engine in response to a driver's request to downshift a transmission for setting up the engine braking and to load the amount of working fluid to an on-coming clutch quickly during the downshift. The system works to determine whether the loaded amount of working fluid is excessive or lacking using the speeds of an input shaft of the transmission and the engine to correct the amount of working fluid to be used upon a subsequent downshift request. The use of the two speeds enables the fact that the loaded fluid amount is excessive which arises from a rise in the speed of the input shaft caused by the engine output increasing control, not by completion of the loading of the working fluid to the on-coming clutch to be found accurately.
    Type: Application
    Filed: December 1, 2005
    Publication date: June 22, 2006
    Applicant: Denso Corporation
    Inventors: Nobuyori Nakajima, Takaji Murakawa, Tetsuji Kozaki
  • Publication number: 20060046896
    Abstract: In executing an ETC cooperative downshift operation based on a driver's intent to decelerate, this system executes an engine output increasing control (e.g. a combination of a throttle opening control and a fuel injection restoring control) for increasing the engine output irrespective of driver's accelerator operation. At the timing a reduction amount in an input shaft rotational speed Nt exceeds a predetermined value K after the ETC cooperative downshift control is started, it is presumed that the hydraulic pressure of a to-be-disengaged clutch is already reduced to a hydraulic pressure level equivalent to a predetermined transmission torque capacity that causes no undesirable acceleration or shock even if the engine output increasing control is started. And, under such assumption, the engine output increasing control is started at this timing.
    Type: Application
    Filed: August 31, 2005
    Publication date: March 2, 2006
    Applicant: Denso Corporation
    Inventors: Nobuyori Nakajima, Takaji Murakawa, Tetsuji Kozaki
  • Publication number: 20060040791
    Abstract: An automotive automatic transmission control apparatus is provided which works to increase the power of an engine in response to a request to down-shift the gear of an automatic transmission for developing the engine braking. The control apparatus includes a fail-safe circuit working to stop increasing the power of the engine when a defect in operation of a transmission hydraulic control circuit is detected after the hydraulic control circuit starts to control the hydraulic pressures to achieve the downshift of the automatic transmission. This eliminates or alleviates a problem, such as unwanted acceleration of the vehicle during the control of the downshift in the transmission.
    Type: Application
    Filed: August 19, 2005
    Publication date: February 23, 2006
    Applicant: DENSO CORPORATION
    Inventors: Nobuyori Nakajima, Takaji Murakawa, Tetsuji Kozaki
  • Patent number: 6780140
    Abstract: In a lockup control system of an automatic transmission with a lockup torque converter, a controller pre-stores a predetermined lockup control map including at least a predetermined coast slip lockup area, within which the system executes a slip lockup control mode under the vehicle's coasting condition, so that a speed difference between input and output speeds of the torque converter is brought closer to a predetermined value. The controller determines whether a first transition from the vehicle's driving condition to the predetermined coast slip lockup area occurs in a release mode of the lockup clutch or a second transition from the vehicle's coasting condition to the predetermined coast slip lockup area occurs in the release mode. When the first transition occurs, the lockup clutch is conditioned in the slip lockup control mode. When the second transition occurs, the lockup clutch is conditioned in the release mode.
    Type: Grant
    Filed: April 22, 2003
    Date of Patent: August 24, 2004
    Assignee: Jatco LTD
    Inventors: Norihiko Okamoto, Nobuyori Nakajima
  • Publication number: 20040117097
    Abstract: A vehicle speed memory unit stores a vehicle speed at a prior predetermined time, the vehicle speed being calculated from an interval of the vehicle speed pulse. A first rapid deceleration detecting section compares an elapsed time from a time the vehicle speed pulse signal is inputted, measured by an elapsed time measuring unit, with a pulse interval corresponding to a predetermined deceleration relative to a vehicle speed stored by the vehicle speed memory unit, or a second rapid deceleration detecting section calculates an undetermined vehicle speed from the elapsed time measured by the elapsed time measuring unit, and calculates a deceleration from the undetermined vehicle speed and the vehicle speed at the prior predetermined time, and compares the calculated deceleration with a predetermined deceleration threshold value. Thus, rapid vehicle deceleration can immediately be determined at the present time without waiting for the determination of the vehicle speed after input of the next pulse signal.
    Type: Application
    Filed: September 24, 2003
    Publication date: June 17, 2004
    Applicant: JATCO Ltd
    Inventors: Masami Tanaka, Nobuyori Nakajima
  • Publication number: 20040018913
    Abstract: In a lockup control system of an automatic transmission with a lockup torque converter, a controller pre-stores a predetermined lockup control map including at least a predetermined coast slip lockup area, within which the system executes a slip lockup control mode under the vehicle's coasting condition, so that a speed difference between input and output speeds of the torque converter is brought closer to a predetermined value. The controller determines whether a first transition from the vehicle's driving condition to the predetermined coast slip lockup area occurs in a release mode of the lockup clutch or a second transition from the vehicle's coasting condition to the predetermined coast slip lockup area occurs in the release mode. When the first transition occurs, the lockup clutch is conditioned in the slip lockup control mode. When the second transition occurs, the lockup clutch is conditioned in the release mode.
    Type: Application
    Filed: April 22, 2003
    Publication date: January 29, 2004
    Applicant: JATCO Ltd
    Inventors: Norihiko Okamoto, Nobuyori Nakajima