Patents by Inventor Yasuo Sagisaka
Yasuo Sagisaka 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).
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Patent number: 8078380Abstract: An electronic throttle control system has a throttle valve to be operated by an electric motor, and an electronic control unit for calculating a target opening degree of the throttle valve depending on a first preset vehicle speed desired by a vehicle driver, so that a vehicle is controlled to automatically run at the preset vehicle speed. When an external module, for example, an ACC module, is added to the electronic throttle control system, and a second preset vehicle speed is inputted from the external module to the electronic control unit the electronic, the electronic control unit selects one of the first and second preset vehicle speeds, which is lower than the other. Then, the target opening degree of the throttle valve is calculated based on the selected preset vehicle speed.Type: GrantFiled: October 6, 2006Date of Patent: December 13, 2011Assignee: Denso CorporationInventor: Yasuo Sagisaka
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Patent number: 7801666Abstract: In a multi-cylinder engine, to compute the air-fuel ratio of each cylinder by an air-fuel ratio sensor disposed in an exhaust pipe, a cylinder is determined by a crank angle detected by a crank angle sensor. A deviation in the air-fuel ratio of each cylinder is detected on the basis of the output signal of the air-fuel ratio sensor disposed in the exhaust pipe and the forcibly changed quantity of the air-fuel ratio.Type: GrantFiled: May 13, 2008Date of Patent: September 21, 2010Assignee: Denso CorporationInventors: Tetsuji Mitsuda, Yasuo Sagisaka, Yasuo Hirata, Eijirou Yamada
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Patent number: 7677227Abstract: An opening of a waste gate vale is adjusted to control an actual supercharging pressure of intake air. Abnormality in a changing characteristic of the actual supercharging pressure relative to a change in a TCV control duty value can be detected. When an engine is in a steady operation condition, the TCV control duty value is forcibly changed repeatedly by a predetermined amount from 0% to 100%. A deviation between a target supercharging pressure corresponding to the TCV control duty value and an actual supercharging pressure is calculated each time the TCV control duty value is changed by the predetermined amount. This deviation is compared with an abnormality determination value to determine presence/absence of the abnormality in the changing characteristic of the actual supercharging pressure relative to the change in the TCV control duty value.Type: GrantFiled: July 3, 2006Date of Patent: March 16, 2010Assignee: DENSO CorporationInventors: Yasuo Sagisaka, Yasuo Mukai, Masahiko Yamaguchi, Kuniaki Ueda
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Publication number: 20080243362Abstract: In a multi-cylinder engine, to compute the air-fuel ratio of each cylinder by an air-fuel ratio sensor disposed in an exhaust pipe, a cylinder is determined by a crank angle detected by a crank angle sensor. A deviation in the air-fuel ratio of each cylinder is detected on the basis of the output signal of the air-fuel ratio sensor disposed in the exhaust pipe and the forcibly changed quantity of the air-fuel ratio.Type: ApplicationFiled: May 13, 2008Publication date: October 2, 2008Applicant: DENSO CorporationInventors: Tetsuji Mitsuda, Yasuo Sagisaka, Yasuo Hirata, Eijirou Yamada
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Patent number: 7380448Abstract: A malfunction detection apparatus is disclosed for a forced induction system. The system includes a compressor provided on an upstream side of a throttle valve in an intake passage of an engine, an upstream intake pressure sensor that detects intake pressure between the compressor and the throttle valve, and an atmospheric pressure sensor that detects atmospheric pressure. The malfunction detection apparatus includes a malfunction detection program that makes a comparison between the atmospheric pressure detected by the atmospheric pressure sensor and the upstream intake pressure detected by the upstream intake pressure sensor. The comparison is made in an operating state of the forced induction system in which the compressor compresses an amount of air that is approximately equal to or less than a predetermined amount to thereby determine whether the upstream pressure sensor has a malfunction.Type: GrantFiled: June 6, 2006Date of Patent: June 3, 2008Assignee: DENSO CorporationInventors: Kuniaki Ueda, Yasuo Sagisaka, Masahiko Yamaguchi, Yasuo Mukai
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Publication number: 20070282558Abstract: A purpose of the invention is to determine abnormal condition of a steering angle sensor at an early stage even in a vehicle, in which a yaw-rate sensor is not provided. An abnormal condition determining system of the invention has a first means for detecting whether the vehicle has passed through a curved road, based on geographical data and position data from a navigation system. The system further has a second means for determining an abnormal condition of the steering angle sensor, when an output change of the steering angle sensor does not reach a predetermined amount in spite that the first means detects that the vehicle has passed through the curved road.Type: ApplicationFiled: June 1, 2007Publication date: December 6, 2007Applicant: DENSO CORPORATIONInventor: Yasuo Sagisaka
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Publication number: 20070240695Abstract: In a multi-cylinder engine, to compute the air-fuel ratio of each cylinder by an air-fuel ratio sensor disposed in an exhaust pipe, a cylinder is determined by a crank angle detected by a crank angle sensor. A deviation in the air-fuel ratio of each cylinder is detected on the basis of the output signal of the air-fuel ratio sensor disposed in the exhaust pipe and the forcibly changed quantity of the air-fuel ratio.Type: ApplicationFiled: March 29, 2007Publication date: October 18, 2007Applicant: DENSO CORPORATIONInventors: Tetsuji Mitsuda, Yasuo Sagisaka, Akihiro Okamoto, Yasuo Hirata, Eijirou Yamada
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Publication number: 20070083317Abstract: An electronic throttle control system has a throttle valve to be operated by an electric motor, and an electronic control unit for calculating a target opening degree of the throttle valve depending on a first preset vehicle speed desired by a vehicle driver, so that a vehicle is controlled to automatically run at the preset vehicle speed. When an external module, for example, an ACC module, is added to the electronic throttle control system, and a second preset vehicle speed is inputted from the external module to the electronic control unit the electronic, the electronic control unit selects one of the first and second preset vehicle speeds, which is lower than the other. Then, the target opening degree of the throttle valve is calculated based on the selected preset vehicle speed.Type: ApplicationFiled: October 6, 2006Publication date: April 12, 2007Applicant: DENSO CORPORATIONInventor: Yasuo Sagisaka
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Publication number: 20060277907Abstract: A malfunction detection apparatus is disclosed for a forced induction system. The system includes a compressor provided on an upstream side of a throttle valve in an intake passage of an engine, an upstream intake pressure sensor that detects intake pressure between the compressor and the throttle valve, and an atmospheric pressure sensor that detects atmospheric pressure. The malfunction detection apparatus includes a malfunction detection program that makes a comparison between the atmospheric pressure detected by the atmospheric pressure sensor and the upstream intake pressure detected by the upstream intake pressure sensor. The comparison is made in an operating state of the forced induction system in which the compressor compresses an amount of air that is approximately equal to or less than a predetermined amount to thereby determine whether the upstream pressure sensor has a malfunction.Type: ApplicationFiled: June 6, 2006Publication date: December 14, 2006Applicant: Denso CorporationInventors: Kuniaki Ueda, Yasuo Sagisaka, Masahiko Yamaguchi, Yasuo Mukai
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Publication number: 20060248889Abstract: An opening of a waste gate vale is adjusted to control an actual supercharging pressure of intake air. Abnormality in a changing characteristic of the actual supercharging pressure relative to a change in a TCV control duty value can be detected. When an engine is in a steady operation condition, the TCV control duty value is forcibly changed repeatedly by a predetermined amount from 0% to 100%. A deviation between a target supercharging pressure corresponding to the TCV control duty value and an actual supercharging pressure is calculated each time the TCV control duty value is changed by the predetermined amount. This deviation is compared with an abnormality determination value to determine presence/absence of the abnormality in the changing characteristic of the actual supercharging pressure relative to the change in the TCV control duty value.Type: ApplicationFiled: July 3, 2006Publication date: November 9, 2006Applicant: DENSO CORPORATIONInventors: Yasuo Sagisaka, Yasuo Mukai, Masahiko Yamaguchi, Kuniaki Ueda
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Patent number: 6644249Abstract: In a cooling mechanism for an engine electronic control module, a base plate of the engine electronic control module is attached to an intake pipe, and includes air rectifier fins. The air rectifier fins have an air rectification function for concentrating suction-air streams at a position while rectifying the suction-air streams, and a cooling function for cooling the engine electronic control module. Suction air flows into an intake duct, in which an air flow meter is provided, through the air rectifier fins. Therefore, eddies of air can be restricted from being generated at an upstream side of the air flow meter, thereby obtaining stable air-flow signals from the air flow meter.Type: GrantFiled: February 5, 2002Date of Patent: November 11, 2003Assignee: Denso CorporationInventors: Keisuke Itakura, Yasuo Sagisaka
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Publication number: 20020104490Abstract: In a cooling mechanism for an engine electronic control module, a base plate of the engine electronic control module is attached to an intake pipe, and includes air rectifier fins. The air rectifier fins have an air rectification function for concentrating suction-air streams at a position while rectifying the suction-air streams, and a cooling function for cooling the engine electronic control module. Suction air flows into an intake duct, in which an air flow meter is provided, through the air rectifier fins. Therefore, eddies of air can be restricted from being generated at an upstream side of the air flow meter, thereby obtaining stable air-flow signals from the air flow meter.Type: ApplicationFiled: February 5, 2002Publication date: August 8, 2002Inventors: Keisuke Itakura, Yasuo Sagisaka
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Patent number: 6314790Abstract: An oxygen concentration detecting apparatus precisely and easily performs diagnosis of a limit current type oxygen sensor. The limit current type oxygen sensor has an oxygen concentration detecting element for outputting limit current proportional to the oxygen concentration and a heater for heating the detecting element. A CPU of a microcomputer controls energization of the heater to activate the oxygen sensor. The CPU calculates element resistance based on the voltage applied to the oxygen sensor and the current detected in the sensor. In a sensor diagnosis routine, the CPU determines whether preconditions for the diagnosis have been met. If all the preconditions have been met, the CPU executes the diagnosis. That is, the CPU determines whether the element resistance is within a predetermined range. If it is below the range, the CPU determines that the sensor has high element temperature abnormality.Type: GrantFiled: October 12, 1999Date of Patent: November 13, 2001Assignee: Nippondenso Co., Ltd.Inventors: Yasuo Sagisaka, Yukihiro Yamashita
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Patent number: 6032659Abstract: An air/fuel ratio control system controls the supply of fuel to an internal combustion engine to achieve a target air/fuel ratio, based on the output of an air/fuel ratio sensor. The system may determine whether there is an abnormality in the air/fuel ratio sensor based on a comparison between a change of an air/fuel ratio correction coefficient, used to drive the air/fuel ratio to the target value, and a change of the target air/fuel ratio if the target air/fuel ratio has sharply changed.Type: GrantFiled: July 22, 1999Date of Patent: March 7, 2000Assignee: Denso CorporationInventors: Yukihiro Yamashita, Hisashi Iida, Yasuo Sagisaka
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Patent number: 6009866Abstract: An oxygen concentration detecting apparatus precisely and easily performs diagnosis of a limit current type oxygen sensor. The limit current type oxygen sensor has an oxygen concentration detecting element for outputting limit current proportional to the oxygen concentration and a heater for heating the detecting element. A CPU of a microcomputer controls energization of the heater to activate the oxygen sensor. The CPU calculates element resistance based on the voltage applied to the oxygen sensor and the current detected in the sensor. In a sensor diagnosis routine, the CPU determines whether preconditions for the diagnosis have been met. If all the preconditions have been met, the CPU executes the diagnosis. That is, the CPU determines whether the element resistance is within a predetermined range. If it is below the range, the CPU determines that the sensor has high element temperature abnormality.Type: GrantFiled: December 10, 1997Date of Patent: January 4, 2000Assignee: Nippondenso Co., Ltd.Inventors: Yasuo Sagisaka, Yukihiro Yamashita
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Patent number: 5964208Abstract: An air/fuel ratio control system controls the supply of fuel to an internal combustion engine to achieve a target air/fuel ratio, based on the output of an air/fuel ratio sensor. The system may determine whether there is an abnormality in the air/fuel ratio sensor based on a comparison between a change of an air/fuel ratio correction coefficient, used to drive the air/fuel ratio to the target value, and a change of the target air/fuel ratio if the target air/fuel ratio has sharply changed.Type: GrantFiled: June 18, 1997Date of Patent: October 12, 1999Assignee: Denso CorporationInventors: Yukihiro Yamashita, Jun Hasegawa, Hisashi Iida, Wakichi Kondo, Yasuo Sagisaka, Masahiko Yamaguchi
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Patent number: 5758632Abstract: The fuel ratio control system controls the supply of fuel to an internal combustion engine to achieve a target air-fuel ratio, based on the output of an air-fuel ratio sensor. The system may determine whether there is an abnormality in the air-fuel ratio sensor based on a comparison between a change of an air-fuel ratio correction coefficient, used to drive the air-fuel ratio to the target value, and a change of the target air-fuel ratio if the target air-fuel ratio has sharply changed.Type: GrantFiled: March 29, 1996Date of Patent: June 2, 1998Assignee: Nippondenso Co., Ltd.Inventors: Yukihiro Yamashita, Hisashi Iida, Yasuo Sagisaka
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Patent number: 5709198Abstract: An oxygen concentration detecting apparatus precisely and easily performs diagnosis of a limit current type oxygen sensor. The limit current type oxygen sensor has an oxygen concentration detecting element for outputting limit current proportional to the oxygen concentration and a heater for heating the detecting element. A CPU of a microcomputer controls energization of the heater to activate the oxygen sensor. The CPU calculates element resistance based on the voltage applied to the oxygen sensor and the current detected in the sensor. In a sensor diagnosis routine, the CPU determines whether preconditions for the diagnosis have been met. If all the preconditions have been met, the CPU executes the diagnosis. That is, the CPU determines whether the element resistance is within a predetermined range. If it is below the range, the CPU determines that the sensor has high element temperature abnormality.Type: GrantFiled: March 26, 1996Date of Patent: January 20, 1998Assignee: Nippondenso Co., Ltd.Inventors: Yasuo Sagisaka, Yukihiro Yamashita
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Patent number: 5701866Abstract: To appropriately detect malfunction of an air quantity adjusting valve in any type of case, an electronic control type throttle valve is disposed in an air intake pipe of an engine. An ISC valve which is duty controlled by an ECU is disposed in a bypass passage which bypasses the throttle valve. A CPU within the ECU establishes a drive duty ratio of the ISC valve to control engine speed in a target speed region during idling of the engine. Additionally, in a case where the drive duty ratio exceeds a predetermined control range (0 to 100%), the CPU controls idle speed by the throttle valve. Accordingly, in a case where throttle aperture is larger than a predetermined value TAH, or in a case where throttle aperture is smaller than a predetermined value TAL (where TAH>TAL), the CPU determines that an opening side malfunction or a closing side malfunction has occurred in the ISC valve.Type: GrantFiled: December 20, 1996Date of Patent: December 30, 1997Assignee: Denso CorporationInventors: Yasuo Sagisaka, Yoshihiko Hirata
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Patent number: 5672817Abstract: A self-diagnostic apparatus of an air-fuel ratio control system of an internal combustion engine performs processes of starting the diagnostic process as the fuel-cut is started, reading and storing a sensor output at the start of the fuel-cut and counting an elapsed time after the start of the fuel-cut by actuating a timer, reading a time until when the sensor output rises from the start of the fuel-cut from the count value of the timer, calculating a rate of change of the sensor output and comparing the calculated rate of change with an abnormality determining value. When the rate of change is large, the response characteristic of the sensor is normal. When it is small, the response characteristic of the sensor is abnormal (degraded), so that the abnormality of the sensor is stored in a memory and an alarm lamp is lighted to inform a driver of the abnormality of the sensor.Type: GrantFiled: December 13, 1995Date of Patent: September 30, 1997Assignee: Nippondenso Co., Ltd.Inventors: Yasuo Sagisaka, Masaaki Nakayama, Yasuo Mukai, Yukihiro Yamashita, Hisashi Iida