Patents by Inventor Keiichi Hiwatashi

Keiichi Hiwatashi 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: 10465614
    Abstract: Disclosed is a vehicle control device which is applied to a vehicle equipped with an engine (10) and an engine torque adjustment mechanism for adjusting an output torque (engine torque) of the engine (10). The vehicle control device comprises a PCM (50) configured, upon satisfaction of a condition that the vehicle is traveling and a steering angle-related value relevant to a steering angle of a steering device is increasing, to control the engine torque adjustment mechanism to reduce the engine torque so as to generate vehicle deceleration to control vehicle attitude. The PCM (50) is further configured to gradually ease the condition, as the number of times of combustion per unit time in the engine (10) becomes smaller.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: November 5, 2019
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Keiichi Hiwatashi, Yasunori Takahara, Daisaku Ogawa, Daisuke Umetsu, Osamu Sunahara, Chikako Ohisa, Koichi Kimoto
  • Patent number: 10414400
    Abstract: A control device for a vehicle includes: an engine (10); an engine torque adjustment mechanism; and a PCM (50) configured to execute vehicle attitude control for, upon satisfaction of a vehicle attitude control executing condition that the vehicle is traveling and a steering angle-related value is increasing, reducing the engine torque to thereby generate deceleration of the vehicle. The PCM (50) is configured, upon satisfaction of a given terminating condition for terminating the vehicle attitude control, to control the engine torque adjustment mechanism to restore the reduced engine torque to an original state before the execution of the vehicle attitude control. The PCM (50) sets a rate of change in the engine output torque being restored, such that it becomes larger as the number of times of combustion per unit time becomes smaller, and restores the engine torque according to the rate of change set in the above manner.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: September 17, 2019
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Keiichi Hiwatashi, Chikako Ohisa, Daisuke Umetsu, Osamu Sunahara, Koichi Kimoto, Yasunori Takahara, Daisaku Ogawa
  • Patent number: 10407071
    Abstract: A control device for a vehicle includes: an engine (10); an engine torque adjustment mechanism; and a PCM (50) configured, upon satisfaction of a condition that the vehicle is traveling and a steering angle-related value is increasing, to control the engine torque adjustment mechanism to reduce the engine torque to thereby execute a vehicle attitude control for generating deceleration of the vehicle, and, upon satisfaction of a given terminating condition for terminating the vehicle attitude control, to restore the reduced engine output torque to an original state before the execution of the vehicle attitude control. The PCM (50) sets a time period from the satisfaction of the terminating condition through until start of restoration of the engine torque, such that it becomes longer as the number of times of combustion per unit time becomes larger, and starts to restore the engine torque when the set time period has elapsed.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: September 10, 2019
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Keiichi Hiwatashi, Daisuke Umetsu, Osamu Sunahara, Koichi Kimoto, Yasunori Takahara, Daisaku Ogawa, Chikako Ohisa
  • Patent number: 10407070
    Abstract: A control device for a vehicle includes: an engine (10); an engine torque adjustment mechanism for adjusting an output torque of the engine; and a PCM (50) configured, upon satisfaction of a vehicle attitude control executing condition that the vehicle is traveling and a steering angle-related value is increasing, to control the engine torque adjustment mechanism to reduce the engine torque to thereby generate deceleration of the vehicle so as to control vehicle attitude. The PCM (50) is further configured to set a rate of change in the engine output torque being reduced, such that the rate of change becomes larger as the number of times of combustion per unit time in the engine (10) becomes smaller, and to control the engine torque adjustment mechanism to reduce the engine output torque according to the rate of change set by the torque reduction change rate-setting part.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: September 10, 2019
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Keiichi Hiwatashi, Daisuke Umetsu, Osamu Sunahara, Koichi Kimoto, Yasunori Takahara, Daisaku Ogawa, Chikako Ohisa
  • Patent number: 10408146
    Abstract: A vehicle control device is provided, which includes an engine, an engine control mechanism configured to control torque generated by the engine, a steering device, and a processor. The processor determines whether a vehicle is traveling and a steering angle related value that is related to a steering angle of the steering device increases, executes a control of the engine control mechanism to reduce the torque when the vehicle is determined to be traveling and the steering angle related value is determined to increase, determines whether a combustion frequency of the engine per unit time is lower than a given value, executes the control for reducing the torque when the combustion frequency is determined to be higher than the given value, and prevents the execution of the control for reducing the torque when the combustion frequency is determined to be lower than the given value.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: September 10, 2019
    Assignee: Mazda Motor Corporation
    Inventors: Daisaku Ogawa, Daisuke Umetsu, Osamu Sunahara, Yasunori Takahara, Yuichiro Akiya, Chikako Ohisa, Atsushi Yamasaki, Keiichi Hiwatashi
  • Publication number: 20190249609
    Abstract: An engine control system comprises: an engine 10 capable of switching between a reduced-cylinder operation mode in which combustion is stopped in a part of a plurality of cylinders 2 and an all-cylinder operation mode in which combustion is performed in all the plurality of cylinders 2; and a PCM 50 configured to stop fuel supply to the cylinders 2 when a given fuel cut-off condition is satisfied. The PCM 50 is operable, during a transition from a state in which the engine 10 is operated in the reduced-cylinder operation mode to a state in which the fuel cut-off condition is satisfied, to stop the fuel supply to the cylinders 2 at a timing earlier than that during a transition from a state in which the engine 10 is operated in the all-cylinder operation mode to the state in which the fuel cut-off condition is satisfied.
    Type: Application
    Filed: October 18, 2017
    Publication date: August 15, 2019
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Keiichi HIWATASHI, Hiroyuki MORIOKA, Yuto SAKASEGAWA, Kenichi OGASAWARA
  • Patent number: 10351164
    Abstract: A vehicle control device is provided, which includes a drive source configured to generate torque as driving force of a vehicle, a transmission torque control mechanism configured to control transmission torque to drive wheels according to the generated torque, and a processor configured to execute a vehicle attitude controlling module to perform a vehicle attitude control by controlling the transmission torque control mechanism to reduce the transmission torque so as to decelerate the vehicle when a starting condition that the vehicle is traveling and a steering angle related value increases is satisfied, and then, when a given terminating condition is satisfied, controlling the mechanism to resume the transmission torque back to the torque before being reduced. The transmission torque is controlled so as to cause a yaw rate that occurs in the vehicle while the vehicle attitude control is performed, to be lower than an upper limit yaw rate.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: July 16, 2019
    Assignee: Mazda Motor Corporation
    Inventors: Daisaku Ogawa, Daisuke Umetsu, Osamu Sunahara, Yasunori Takahara, Yuichiro Akiya, Chikako Ohisa, Atsushi Yamasaki, Keiichi Hiwatashi
  • Patent number: 10336364
    Abstract: A vehicle control device is provided, which includes an engine, an engine control mechanism configured to control torque generated by the engine, a processor configured to execute a vehicle attitude controlling module to control attitude of a vehicle by controlling the engine control mechanism to reduce the torque so as to decelerate the vehicle, when a condition that the vehicle is traveling and a steering angle related value that is related to a steering angle of a steering device increases is satisfied, and a torque reduction amount setting module to set the reduction amount of the torque to be larger as a combustion frequency of the engine per unit time decreases. The vehicle attitude controlling module controls the engine control mechanism to reduce the torque based on the set reduction amount.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: July 2, 2019
    Assignee: Mazda Motor Corporation
    Inventors: Daisaku Ogawa, Daisuke Umetsu, Osamu Sunahara, Yasunori Takahara, Yuichiro Akiya, Chikako Ohisa, Atsushi Yamasaki, Keiichi Hiwatashi
  • Publication number: 20190077391
    Abstract: A vehicle control device comprises: a downshift control part (51) configured, upon issuance of a downshift request for downshifting an automatic transmission (200), to execute a downshift control of downshifting the automatic transmission (200) and driving an engine torque regulating mechanism to increase an output torque of an engine (10); a vehicle attitude control part (53) configured, upon satisfaction of a condition that the vehicle is traveling and a steering angle-related value pertaining to a steering angle of a steering device increases, to execute a vehicle attitude control of reducing the output torque of the engine (10) to generate deceleration of the vehicle so as to control vehicle attitude; and a downshift suppression part (55) configured, when the vehicle attitude control is executed, to suppress the execution of the downshift control.
    Type: Application
    Filed: July 13, 2016
    Publication date: March 14, 2019
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Keiichi HIWATASHI, Daisuke UMETSU, Osamu SUNAHARA, Yasunori TAKAHARA, Chikako OHISA, Daisaku OGAWA
  • Patent number: 10220838
    Abstract: Disclosed is a vehicle control device which is applied to a vehicle equipped with an engine (10) and an engine torque adjustment mechanism for adjusting an engine torque. The control device comprises a PCM (50) configured, upon satisfaction of a condition that the vehicle is traveling and a steering angle-related value relevant to a steering angle of a steering device is increasing, to control the engine torque adjustment mechanism to reduce the engine torque, so as to execute a vehicle attitude control for generating vehicle deceleration. The PCM (50) is configured, upon satisfaction of a vehicle attitude control-terminating condition for terminating the vehicle attitude control, to control the engine torque adjustment mechanism to restore the engine torque to an original level of torque before the execution of the vehicle attitude control.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: March 5, 2019
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Keiichi Hiwatashi, Daisuke Umetsu, Osamu Sunahara, Koichi Kimoto, Yasunori Takahara, Daisaku Ogawa, Chikako Ohisa
  • Publication number: 20180345977
    Abstract: A control device for a vehicle includes: an engine (10); an engine torque adjustment mechanism; and a PCM (50) configured, upon satisfaction of a condition that the vehicle is traveling and a steering angle-related value is increasing, to control the engine torque adjustment mechanism to reduce the engine torque to thereby execute a vehicle attitude control for generating deceleration of the vehicle, and, upon satisfaction of a given terminating condition for terminating the vehicle attitude control, to restore the reduced engine output torque to an original state before the execution of the vehicle attitude control. The PCM (50) sets a time period from the satisfaction of the terminating condition through until start of restoration of the engine torque, such that it becomes longer as the number of times of combustion per unit time becomes larger, and starts to restore the engine torque when the set time period has elapsed.
    Type: Application
    Filed: September 9, 2016
    Publication date: December 6, 2018
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Keiichi HIWATASHI, Daisuke UMETSU, Osamu SUNAHARA, Koichi KIMOTO, Yasunori TAKAHARA, Daisaku OGAWA, Chikako OHISA
  • Publication number: 20180347477
    Abstract: A control device for a vehicle includes: an engine (10); an engine torque adjustment mechanism for adjusting an output torque of the engine; and a PCM (50) configured, upon satisfaction of a condition that the vehicle is traveling, and that a steering angle-related value pertaining to a steering angle of a steering system is increasing, to control the engine torque adjustment mechanism to reduce the engine torque to thereby generate deceleration of the vehicle so as to control vehicle attitude. The PCM (50) is configured to set a time period from the satisfaction of the condition through until start of reduction in the engine torque, such that it becomes longer, as the number of times of combustion per unit time in the engine becomes larger, and to control the engine torque adjustment mechanism to start to reduce the engine torque when the set time period has elapsed.
    Type: Application
    Filed: September 9, 2016
    Publication date: December 6, 2018
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Keiichi HIWATASHI, Yasunori TAKAHARA, Daisaku OGAWA, Daisuke UMETSU, Osamu SUNAHARA, Koichi KIMOTO, Chikako OHISA
  • Publication number: 20180345976
    Abstract: A control device for a vehicle includes: an engine (10); an engine torque adjustment mechanism for adjusting an output torque of the engine; and a PCM (50) configured, upon satisfaction of a vehicle attitude control executing condition that the vehicle is traveling and a steering angle-related value is increasing, to control the engine torque adjustment mechanism to reduce the engine torque to thereby generate deceleration of the vehicle so as to control vehicle attitude. The PCM (50) is further configured to set a rate of change in the engine output torque being reduced, such that the rate of change becomes larger as the number of times of combustion per unit time in the engine (10) becomes smaller, and to control the engine torque adjustment mechanism to reduce the engine output torque according to the rate of change set by the torque reduction change rate-setting part.
    Type: Application
    Filed: September 9, 2016
    Publication date: December 6, 2018
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Keiichi HIWATASHI, Daisuke UMETSU, Osamu SUNAHARA, Koichi KIMOTO, Yasunori TAKAHARA, Daisaku OGAWA, Chikako OHISA
  • Publication number: 20180345975
    Abstract: A control device for a vehicle includes: an engine (10); an engine torque adjustment mechanism; and a PCM (50) configured to execute vehicle attitude control for, upon satisfaction of a vehicle attitude control executing condition that the vehicle is traveling and a steering angle-related value is increasing, reducing the engine torque to thereby generate deceleration of the vehicle. The PCM (50) is configured, upon satisfaction of a given terminating condition for terminating the vehicle attitude control, to control the engine torque adjustment mechanism to restore the reduced engine torque to an original state before the execution of the vehicle attitude control. The PCM (50) sets a rate of change in the engine output torque being restored, such that it becomes larger as the number of times of combustion per unit time becomes smaller, and restores the engine torque according to the rate of change set in the above manner.
    Type: Application
    Filed: September 9, 2016
    Publication date: December 6, 2018
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Keiichi HIWATASHI, Chikako OHISA, Daisuke UMETSU, Osamu SUNAHARA, Koichi KIMOTO, Yasunori TAKAHARA, Daisaku OGAWA
  • Publication number: 20180281780
    Abstract: Disclosed is a vehicle control device which is applied to a vehicle equipped with an engine (10) and an engine torque adjustment mechanism for adjusting an engine torque. The control device comprises a PCM (50) configured, upon satisfaction of a condition that the vehicle is traveling and a steering angle-related value relevant to a steering angle of a steering device is increasing, to control the engine torque adjustment mechanism to reduce the engine torque, so as to execute a vehicle attitude control for generating vehicle deceleration. The PCM (50) is configured, upon satisfaction of a vehicle attitude control-terminating condition for terminating the vehicle attitude control, to control the engine torque adjustment mechanism to restore the engine torque to an original level of torque before the execution of the vehicle attitude control.
    Type: Application
    Filed: December 22, 2016
    Publication date: October 4, 2018
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Keiichi HIWATASHI, Daisuke UMETSU, Osamu SUNAHARA, Koichi KIMOTO, Yasunori TAKAHARA, Daisaku OGAWA, Chikako OHISA
  • Publication number: 20180274459
    Abstract: Disclosed is a vehicle control device which is applied to a vehicle equipped with an engine (10) and an engine torque adjustment mechanism for adjusting an output torque (engine torque) of the engine (10). The vehicle control device comprises a PCM (50) configured, upon satisfaction of a condition that the vehicle is traveling and a steering angle-related value relevant to a steering angle of a steering device is increasing, to control the engine torque adjustment mechanism to reduce the engine torque so as to generate vehicle deceleration to control vehicle attitude. The PCM (50) is further configured to gradually ease the condition, as the number of times of combustion per unit time in the engine (10) becomes smaller.
    Type: Application
    Filed: December 22, 2016
    Publication date: September 27, 2018
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Keiichi HIWATASHI, Yasunori TAKAHARA, Daisaku OGAWA, Daisuke UMETSU, Osamu SUNAHARA, Chikako OHISA, Koichi KIMOTO
  • Patent number: 10082124
    Abstract: A vehicle control device is provided, which includes an engine including an ignition plug oriented inside a combustion chamber, a component provided in or near an exhaust passage of the engine, a processor configured to execute a vehicle attitude controlling module for controlling an attitude of a vehicle by retarding an ignition timing of the ignition plug to reduce an engine torque so as to decelerate the vehicle, when a condition is satisfied, the condition being that the vehicle is traveling and a steering angle related value that is related to a steering angle of a steering device increases, and a torque reduction restricting module for restricting a reduction amount of the engine torque as at least one of an engine load and an engine speed increases during the vehicle attitude control.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: September 25, 2018
    Assignee: Mazda Motor Corporation
    Inventors: Keiichi Hiwatashi, Yasunori Takahara, Daisaku Ogawa, Daisuke Umetsu, Chikako Ohisa, Koichi Kimoto
  • Publication number: 20180265119
    Abstract: A vehicle control device is provided, which includes a drive source configured to generate torque as driving force of a vehicle, a transmission torque control mechanism configured to control transmission torque to drive wheels according to the generated torque, and a processor configured to execute a vehicle attitude controlling module to perform a vehicle attitude control by controlling the transmission torque control mechanism to reduce the transmission torque so as to decelerate the vehicle when a starting condition that the vehicle is traveling and a steering angle related value increases is satisfied, and then, when a given terminating condition is satisfied, controlling the mechanism to resume the transmission torque back to the torque before being reduced. The transmission torque is controlled so as to cause a yaw rate that occurs in the vehicle while the vehicle attitude control is performed, to be lower than an upper limit yaw rate.
    Type: Application
    Filed: February 20, 2018
    Publication date: September 20, 2018
    Inventors: Daisaku Ogawa, Daisuke Umetsu, Osamu Sunahara, Yasunori Takahara, Yuichiro Akiya, Chikako Ohisa, Atsushi Yamasaki, Keiichi Hiwatashi
  • Publication number: 20180266346
    Abstract: A vehicle control device is provided, which includes an engine, an engine control mechanism configured to control torque generated by the engine, and a processor configured to execute a vehicle attitude controlling module to perform a vehicle attitude control in which the engine control mechanism is controlled to reduce the torque so as to decelerate the vehicle, when a condition that the vehicle is traveling and a steering angle related value that is related to a steering angle of a steering device increases is satisfied, and a preventing module to prevent a combustion frequency of the engine per unit time from falling below a given value while the vehicle attitude controlling module executes the vehicle attitude control.
    Type: Application
    Filed: February 21, 2018
    Publication date: September 20, 2018
    Inventors: Daisaku Ogawa, Daisuke Umetsu, Osamu Sunahara, Yasunori Takahara, Yuichiro Akiya, Chikako Ohisa, Atsushi Yamasaki, Keiichi Hiwatashi
  • Publication number: 20180266345
    Abstract: A vehicle control device is provided, which includes an engine, an engine control mechanism configured to control torque generated by the engine, a steering device, and a processor. The processor determines whether a vehicle is traveling and a steering angle related value that is related to a steering angle of the steering device increases, executes a control of the engine control mechanism to reduce the torque when the vehicle is determined to be traveling and the steering angle related value is determined to increase, determines whether a combustion frequency of the engine per unit time is lower than a given value, executes the control for reducing the torque when the combustion frequency is determined to be higher than the given value, and prevents the execution of the control for reducing the torque when the combustion frequency is determined to be lower than the given value.
    Type: Application
    Filed: February 21, 2018
    Publication date: September 20, 2018
    Inventors: Daisaku Ogawa, Daisuke Umetsu, Osamu Sunahara, Yasunori Takahara, Yuichiro Akiya, Chikako Ohisa, Atsushi Yamasaki, Keiichi Hiwatashi