Patents by Inventor Tetsuji Kozaki

Tetsuji Kozaki 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: 8253409
    Abstract: In a range detection device, a movable member has a magnetized portion and can move with a manual valve of a control device. A supporting member includes a plate portion having a surface opposed to the magnetized portion and a recess formed in an opposite surface of the plate portion, and supports the movable member such that the movable member is capable of moving parallel with the plate portion. A substrate is placed in the recess and has a first hole that penetrates the substrate. A magnetic detection element is installed to a surface of the substrate at a side of the plate portion to correspond to a position of the first hole, and detects magnetism of the magnetized portion. A sealing member is filled in the recess and covers the substrate and the magnetic detection element.
    Type: Grant
    Filed: July 19, 2010
    Date of Patent: August 28, 2012
    Assignee: Denso Corporation
    Inventors: Tatsuya Kitanaka, Tetsuji Kozaki, Hirotsugu Ishino, Hajime Yokoyama
  • Publication number: 20110025308
    Abstract: In a range detection device, a movable member has a magnetized portion and can move with a manual valve of a control device. A supporting member includes a plate portion having a surface opposed to the magnetized portion and a recess formed in an opposite surface of the plate portion, and supports the movable member such that the movable member is capable of moving parallel with the plate portion. A substrate is placed in the recess and has a first hole that penetrates the substrate. A magnetic detection element is installed to a surface of the substrate at a side of the plate portion to correspond to a position of the first hole, and detects magnetism of the magnetized portion. A sealing member is filled in the recess and covers the substrate and the magnetic detection element.
    Type: Application
    Filed: July 19, 2010
    Publication date: February 3, 2011
    Applicant: DENSO CORPORATION
    Inventors: Tatsuya Kitanaka, Tetsuji Kozaki, Hirotsugu Ishino, Hajime Yokoyama
  • 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: 7584681
    Abstract: An automatic transmission control system equipped with a shift lever position sensor which includes a plurality of switches which output binary signals following a shifting motion of a gear shift lever. Patterns of combinations of the switch outputs are preselected so as to represent positions to which the gear shift lever is manually shiftable. The switches are broken down into two groups each of which produces a binary code carrying information about the position of the gear shift lever to monitor a failure in operation of the shift lever position sensor. The control system also works to perform a deemed D-position hydraulic transmission control to ensure the running of the vehicle even if the shift lever position sensor is failing.
    Type: Grant
    Filed: July 10, 2008
    Date of Patent: September 8, 2009
    Assignee: Denso Corporation
    Inventors: Tetsuji Kozaki, Takaji Murakawa
  • Patent number: 7563196
    Abstract: In performing a down-shift based on a driver's intention of deceleration, an engine output increasing control is started at a time when a transfer torque capacity of the releasing clutch becomes small or zero and the actual oil pressure decreases to an initial oil pressure, not causing an acceleration feeling even upon the engine output increase. For estimating a time when which the real pressure of the releasing clutch decreases to a level of not higher than the initial pressure, the response of the real pressure relative to an oil pressure command value for the releasing clutch is approximated using a transfer characteristic of “first order lag+time delay.” An estimated real oil pressure obtained based on the transfer characteristic is compared with the initial pressure. It is determined a start timing of the engine output increasing control has been reached upon decrease of the estimated pressure to the initial pressure.
    Type: Grant
    Filed: April 19, 2005
    Date of Patent: July 21, 2009
    Assignee: DENSO Corporation
    Inventors: Jun Yamada, 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: 20080276738
    Abstract: An automatic transmission control system equipped with a shift lever position sensor which includes a plurality of switches which output binary signals following a shifting motion of a gear shift lever. Patterns of combinations of the switch outputs are preselected so as to represent positions to which the gear shift lever is manually shiftable. The switches are broken down into two groups each of which produces a binary code carrying information about the position of the gear shift lever to monitor a failure in operation of the shift lever position sensor. The control system also works to perform a deemed D-position hydraulic transmission control to ensure the running of the vehicle even if the shift lever position sensor is failing.
    Type: Application
    Filed: July 10, 2008
    Publication date: November 13, 2008
    Applicant: DENSO CORPORATION
    Inventors: Tetsuji Kozaki, Takaji Murakawa
  • 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: 7393305
    Abstract: In performing a down-shift based on a driver's intention of deceleration, an engine output increasing control is started at a time when a transfer torque capacity of the releasing clutch becomes small or zero and the actual oil pressure decreases to an initial oil pressure, not causing an acceleration feeling even upon the engine output increase. For estimating a time when which the real pressure of the releasing clutch decreases to a level of not higher than the initial pressure, the response of the real pressure relative to an oil pressure command value for the releasing clutch is approximated using a transfer characteristic of “first order lag+time delay.” An estimated real oil pressure obtained based on the transfer characteristic is compared with the initial pressure. It is determined a start timing of the engine output increasing control has been reached upon decrease of the estimated pressure to the initial pressure.
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: July 1, 2008
    Assignee: DENSO Corporation
    Inventors: Jun Yamada, Tetsuji Kozaki
  • Patent number: 7384375
    Abstract: When a charge control is applied to a clutch during a shifting operation of an automatic transmission, a charge counter of this clutch is set to a predetermined value. When a drain control is applied to the clutch, the charge counter is counted down. In response to renewal of requested gear position during the shifting operation, a judgment is made as to whether the state of charge is clear with respect to hydraulic fluid supplied to the clutch (i.e. to-be-newly-charged clutch) before the charge control is applied to this clutch for establishing a renewed requested gear position. When the charge counter of this clutch is currently counted down, it is decided that the charged condition of hydraulic fluid supplied to the clutch is unclear. Thus, a multi-stage gear shifting control (i.e. replacement or renewal of target gear position) is prohibited, thereby suppressing generation of shift shock.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: June 10, 2008
    Assignee: DENSO CORPORATION
    Inventors: Jun Yamada, 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
  • Publication number: 20070179017
    Abstract: In performing a down-shift based on a driver's intention of deceleration, an engine output increasing control is started at a time when a transfer torque capacity of the releasing clutch becomes small or zero and the actual oil pressure decreases to an initial oil pressure, not causing an acceleration feeling even upon the engine output increase. For estimating a time when which the real pressure of the releasing clutch decreases to a level of not higher than the initial pressure, the response of the real pressure relative to an oil pressure command value for the releasing clutch is approximated using a transfer characteristic of “first order lag+time delay.” An estimated real oil pressure obtained based on the transfer characteristic is compared with the initial pressure. It is determined a start timing of the engine output increasing control has been reached upon decrease of the estimated pressure to the initial pressure.
    Type: Application
    Filed: April 2, 2007
    Publication date: August 2, 2007
    Applicant: DENSO CORPORATION
    Inventors: Jun Yamada, Tetsuji Kozaki
  • 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
  • Publication number: 20050245351
    Abstract: In performing a down-shift based on a driver's intention of deceleration, an engine output increasing control is started at a time when a transfer torque capacity of the releasing clutch becomes small or zero and the actual oil pressure decreases to an initial oil pressure, not causing an acceleration feeling even upon the engine output increase. For estimating a time when which the real pressure of the releasing clutch decreases to a level of not higher than the initial pressure, the response of the real pressure relative to an oil pressure command value for the releasing clutch is approximated using a transfer characteristic of “first order lag+time delay.” An estimated real oil pressure obtained based on the transfer characteristic is compared with the initial pressure. It is determined a start timing of the engine output increasing control has been reached upon decrease of the estimated pressure to the initial pressure.
    Type: Application
    Filed: April 19, 2005
    Publication date: November 3, 2005
    Applicant: DENSO CORPORATION
    Inventors: Jun Yamada, Tetsuji Kozaki
  • Publication number: 20050137056
    Abstract: When a charge control is applied to a clutch during a shifting operation of an automatic transmission, a charge counter of this clutch is set to a predetermined value. When a drain control is applied to the clutch, the charge counter is counted down. In response to renewal of requested gear position during the shifting operation, a judgment is made as to whether the state of charge is clear with respect to hydraulic fluid supplied to the clutch (i.e. to-be-newly-charged clutch) before the charge control is applied to this clutch for establishing a renewed requested gear position. When the charge counter of this clutch is currently counted down, it is decided that the charged condition of hydraulic fluid supplied to the clutch is unclear. Thus, a multi-stage gear shifting control (i.e. replacement or renewal of target gear position) is prohibited, thereby suppressing generation of shift shock.
    Type: Application
    Filed: December 17, 2004
    Publication date: June 23, 2005
    Applicant: DENSO CORPORATION
    Inventors: Jun Yamada, Tetsuji Kozaki