Patents by Inventor Shuichi Wada
Shuichi Wada 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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Publication number: 20230332563Abstract: The failure diagnosis apparatus whether or not a failure exists in a fuel-evaporation-gas purging system that a negative pressure in an intake system of an internal combustion engine is introduced into an accumulator and pressure accumulation is performed in a time period from a time when a driver turns off an ignition key to a time when the internal combustion engine stops its rotation, that the accumulated negative pressure is introduced into a fuel-evaporation-gas path before the internal combustion engine stops the rotation or after the internal combustion engine has stopped the rotation, and that in a time from a time when after the internal combustion engine has stopped the rotation, the driver again turns on the ignition key to a time when the internal combustion engine starts, it is determined whether or not a pressure change in the fuel-evaporation-gas path exists.Type: ApplicationFiled: September 19, 2022Publication date: October 19, 2023Applicant: Mitsubishi Electric CorporationInventors: Hiroshi SURUGA, Shuichi Wada, Yosuke Fukuzawa
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Patent number: 11366041Abstract: An engine misfire detection device such that an engine misfire state can be accurately detected is obtained. The engine misfire detection device includes an engine rotational speed change amount detector that detects an engine rotational speed change amount, an engine rotational speed change amount threshold setter that sets a threshold with respect to the rotational speed change amount, and a misfire detector that compares the rotational speed change amount and the threshold, carries out a misfire determination on the engine when the rotational speed change amount exceeds the threshold, and carries out a misfire detection, wherein the misfire detector prohibits the misfire determination when a switching between a differentially locked state and an unlocked state is carried out.Type: GrantFiled: November 25, 2019Date of Patent: June 21, 2022Assignee: Mitsubishi Electric CorporationInventors: Takashi Hozuki, Shuichi Wada, Takeshi Koda
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Publication number: 20200319060Abstract: An engine misfire detection device such that an engine misfire state can be accurately detected is obtained. The engine misfire detection device includes an engine rotational speed change amount detector that detects an engine rotational speed change amount, an engine rotational speed change amount threshold setter that sets a threshold with respect to the rotational speed change amount, and a misfire detector that compares the rotational speed change amount and the threshold, carries out a misfire determination on the engine when the rotational speed change amount exceeds the threshold, and carries out a misfire detection, wherein the misfire detector prohibits the misfire determination when a switching between a differentially locked state and an unlocked state is carried out.Type: ApplicationFiled: November 25, 2019Publication date: October 8, 2020Applicant: Mitsubishi Electric CorporationInventors: Takashi HOZUKI, Shuichi WADA, Takeshi KODA
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Patent number: 10458355Abstract: Provided is an engine control device for correcting output characteristics of an oxygen sensor and performing air-fuel ratio feedback control. The engine control device includes various sensors for detecting operating state information of an engine, an oxygen sensor, and air-fuel ratio feedback controller to adjust an amount of fuel injected into the engine, on the basis of the operating state information and an output voltage value of the oxygen sensor, wherein the air-fuel ratio feedback controller calculates, in accordance with the operating state information based on detection results from the various sensors, a coefficient for correcting the output voltage value, implements air-fuel ratio feedback control on the basis of an air-fuel ratio feedback control correction amount calculated using a corrected oxygen sensor output voltage value calculated on the basis of the coefficient, and adjusts the amount of fuel injected into the engine.Type: GrantFiled: September 22, 2017Date of Patent: October 29, 2019Assignee: Mitsubishi Electric CorporationInventors: Mitsuaki Shirasaki, Shuichi Wada, Kenichi Yamagata, Katsuya Monguchi
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Patent number: 10174685Abstract: The control device for an internal combustion engine including a plurality of cylinders includes: a misfire detection unit for detecting a misfire state for each of the plurality of cylinders; a plurality of electronic throttles each provided on an intake pipe corresponding to each of the plurality of cylinders, for adjusting an intake air amount taken into each cylinder by way of a throttle opening degree; and a throttle opening degree control unit for controlling the throttle opening degree of each of the plurality of electronic throttles. When the misfire detection unit detects the misfire state in any one of the plurality of cylinders, the throttle opening degree control unit decreases a limited value of the throttle opening degree of the cylinder in the misfire state as time elapses.Type: GrantFiled: October 11, 2013Date of Patent: January 8, 2019Assignee: Mitsubishi Electric CorporationInventors: Shingo Takahashi, Shuichi Wada
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Publication number: 20180266353Abstract: Provided is an engine control device for correcting output characteristics of an oxygen sensor and performing air-fuel ratio feedback control. The engine control device includes various sensors for detecting operating state information of an engine, an oxygen sensor, and air-fuel ratio feedback controller to adjust an amount of fuel injected into the engine, on the basis of the operating state information and an output voltage value of the oxygen sensor, wherein the air-fuel ratio feedback controller calculates, in accordance with the operating state information based on detection results from the various sensors, a coefficient for correcting the output voltage value, implements air-fuel ratio feedback control on the basis of an air-fuel ratio feedback control correction amount calculated using a corrected oxygen sensor output voltage value calculated on the basis of the coefficient, and adjusts the amount of fuel injected into the engine.Type: ApplicationFiled: September 22, 2017Publication date: September 20, 2018Applicant: Mitsubishi Electric CorporationInventors: Mitsuaki SHIRASAKI, Shuichi WADA, Kenichi YAMAGATA, Katsuya MONGUCHI
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Patent number: 9845758Abstract: An air-fuel ratio region detection unit, including a first determination voltage higher than a target voltage value indicating the stoichiometric air-fuel ratio, and a second determination voltage lower than the target voltage value, determines that an air-fuel ratio of an engine is within a first rich region when an oxygen sensor output equals or exceeds the first determination voltage, determines that the air-fuel ratio is within a second rich region when the oxygen sensor output equals or exceeds the target voltage value but is lower than the first determination voltage, determines that the air-fuel ratio is within a second lean region when the oxygen sensor output equals or exceeds the second determination voltage but is lower than the target voltage value, and determines that the air-fuel ratio is within a first lean region when the oxygen sensor output is lower than the second determination voltage.Type: GrantFiled: May 9, 2016Date of Patent: December 19, 2017Assignee: Mitsubishi Electric CorporationInventors: Nobuyoshi Tomomatsu, Shuichi Wada, Kenichi Yamagata
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Publication number: 20170152807Abstract: An air-fuel ratio region detection unit, including a first determination voltage higher than a target voltage value indicating the stoichiometric air-fuel ratio, and a second determination voltage lower than the target voltage value, determines that an air-fuel ratio of an engine is within a first rich region when an oxygen sensor output equals or exceeds the first determination voltage, determines that the air-fuel ratio is within a second rich region when the oxygen sensor output equals or exceeds the target voltage value but is lower than the first determination voltage, determines that the air-fuel ratio is within a second lean region when the oxygen sensor output equals or exceeds the second determination voltage but is lower than the target voltage value, and determines that the air-fuel ratio is within a first lean region when the oxygen sensor output is lower than the second determination voltage.Type: ApplicationFiled: May 9, 2016Publication date: June 1, 2017Applicant: Mitsubishi Electric CorporationInventors: Nobuyoshi TOMOMATSU, Shuichi WADA, Kenichi YAMAGATA
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Patent number: 9243978Abstract: Provided are a misfire detection apparatus and a misfire detection method for an internal combustion engine, which are capable of correctly detecting a misfire state of an engine for a vehicle small in number of cylinders and in rotational inertia without limiting control to O2 feedback control. When an air/fuel ratio of an exhaust gas exhausted from a cylinder that is a misfire determination subject is in a lean state, and when lean control is not being carried out on the internal combustion engine, enrichment processing for the air/fuel ratio is carried out. When the air/fuel ratio remains in the lean state even though the enrichment processing is carried out, it is determined that misfire occurs in the cylinder that is a misfire determination subject.Type: GrantFiled: January 29, 2014Date of Patent: January 26, 2016Assignee: Mitsubishi Electric CorporationInventor: Shuichi Wada
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Publication number: 20150075508Abstract: Provided are a misfire detection apparatus and a misfire detection method for an internal combustion engine, which are capable of correctly detecting a misfire state of an engine for a vehicle small in number of cylinders and in rotational inertia without limiting control to O2 feedback control. When an air/fuel ratio of an exhaust gas exhausted from a cylinder that is a misfire determination subject is in a lean state, and when lean control is not being carried out on the internal combustion engine, enrichment processing for the air/fuel ratio is carried out. When the air/fuel ratio remains in the lean state even though the enrichment processing is carried out, it is determined that misfire occurs in the cylinder that is a misfire determination subject.Type: ApplicationFiled: January 29, 2014Publication date: March 19, 2015Applicant: Mitsubishi Electric CorporationInventor: Shuichi WADA
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Publication number: 20140316680Abstract: The control device for an internal combustion engine including a plurality of cylinders includes: a misfire detection unit for detecting a misfire state for each of the plurality of cylinders; a plurality of electronic throttles each provided on an intake pipe corresponding to each of the plurality of cylinders, for adjusting an intake air amount taken into each cylinder by way of a throttle opening degree; and a throttle opening degree control unit for controlling the throttle opening degree of each of the plurality of electronic throttles. When the misfire detection unit detects the misfire state in any one of the plurality of cylinders, the throttle opening degree control unit decreases a limited value of the throttle opening degree of the cylinder in the misfire state as time elapses.Type: ApplicationFiled: October 11, 2013Publication date: October 23, 2014Applicant: Mitsubishi Electric CorporationInventors: Shingo TAKAHASHI, Shuichi WADA
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Patent number: 8762031Abstract: There is obtained an internal combustion engine control apparatus that can accurately determine the state of coupling between an internal combustion engine and a driving device so as to appropriately control the internal combustion engine. An internal combustion engine control apparatus according to the present invention includes a reference value learning function that learns a real calculation value, as the reference learning value for a transmission gear, when there are satisfied a first condition that the vehicle speed detected by a vehicle speed sensor, the real rotation speed detected by a rotation sensor, and the throttle opening degree detected by a throttle opening degree sensor are in predetermined ranges and a second condition that the real calculation value indicating the ratio of the vehicle speed detected by the vehicle speed sensor to the real rotation speed detected by the rotation sensor is in a predetermined state.Type: GrantFiled: August 31, 2011Date of Patent: June 24, 2014Assignee: Mitsubishi Electric CorporationInventor: Shuichi Wada
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Publication number: 20120271530Abstract: There is obtained an internal combustion engine control apparatus that can accurately determine the state of coupling between an internal combustion engine and a driving device so as to appropriately control the internal combustion engine. An internal combustion engine control apparatus according to the present invention includes a reference value learning function that learns a real calculation value, as the reference learning value for a transmission gear, when there are satisfied a first condition that the vehicle speed detected by a vehicle speed sensor, the real rotation speed detected by a rotation sensor, and the throttle opening degree detected by a throttle opening degree sensor are in predetermined ranges and a second condition that the real calculation value indicating the ratio of the vehicle speed detected by the vehicle speed sensor to the real rotation speed detected by the rotation sensor is in a predetermined state.Type: ApplicationFiled: August 31, 2011Publication date: October 25, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventor: Shuichi WADA
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Patent number: 7659037Abstract: Using a positive electrode active material including spinel type manganese oxide as the main constituent, a novel low cost and high output power flat type nonaqueous secondary cell for HEVs that has increased safety at overcharge, and superior storage properties and cycle life is provided. A flat type nonaqueous secondary cell that has increased safety and is superior in storage and cycle properties even though the cell is a laminate type cell which does not have a blocking mechanism can be obtained by blending the spinel type lithium manganese oxide of the positive electrode and 5 wt % to 40 wt % of layered type lithium manganese oxide, to suppress storage deterioration at a high temperature and to simultaneously achieve safety when overcharged, and further, by adding a Li compound having a structure as shown in Formula (1) structure, to suppress deterioration of a mixed positive electrode active material during a high temperature cycle.Type: GrantFiled: December 13, 2006Date of Patent: February 9, 2010Assignees: Hitachi, Ltd., Hitachi Vehicle Energy, Ltd.Inventors: Hiroshi Fukunaga, Youshin Yagi, Shuichi Wada, Kenji Hara, Kazushige Kohno, Hiroshi Haruna
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Publication number: 20070134558Abstract: Using a positive electrode active material including spinel type manganese oxide as the main constituent, a novel low cost and high output power flat type nonaqueous secondary cell for HEVs that has increased safety at overcharge, and superior storage properties and cycle life is provided. A flat type nonaqueous secondary cell that has increased safety and is superior in storage and cycle properties even though the cell is a laminate type cell which does not have a blocking mechanism can be obtained by blending the spinel type lithium manganese oxide of the positive electrode and 5 wt % to 40 wt % of layered type lithium manganese oxide, to suppress storage deterioration at a high temperature and to simultaneously achieve safety when overcharged, and further, by adding a Li compound having a structure as shown in Formula (1) structure, to suppress deterioration of a mixed positive electrode active material during a high temperature cycle.Type: ApplicationFiled: December 13, 2006Publication date: June 14, 2007Inventors: Hiroshi Fukunaga, Youshin Yagi, Shuichi Wada, Konji Hara, Kazushige Kohno, Hiroshi Haruna
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Publication number: 20060073387Abstract: A lithium secondary battery includes a positive electrode, a negative electrode and nonaqueous electrolyte, wherein the negative electrode includes a negative active material and a binder, the negative active material comprises graphite A and graphite B, shapes of primary particles of the graphite A are spherical or elliptical, an average particle diameter of the primary particles of the graphite A ranges between 10 ?m and 30 ?m inclusive, sizes of crystallites of the graphite A in a direction of a c-axis are smaller than 100 nm and tap density of the graphite A is 1.0 g/cm3 or higher, shapes of primary particles of the graphite B are flat, an average particle diameter of the primary particles of the graphite B ranges between 1 ?m and 10 ?m inclusive, and sizes of crystallites of the graphite B in a direction of a c-axis are 100 nm or larger, which has a large capacity and excellent cycle characteristics.Type: ApplicationFiled: January 21, 2004Publication date: April 6, 2006Applicant: Hitachi Maxell, Ltd.Inventors: Haruo Sakagoshi, Masuhiro Onishi, Hyo Azuma, Seiji Ishizawa, Fumio Togawa, Shuichi Wada
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Patent number: 6725149Abstract: There are provided, various sensors for detecting the operating state of the internal combustion engine; a rotational speed sensor, an air flow sensor, a throttle sensor, an intake air pressure sensor of an internal combustion engine; a storage where the charging efficiency corresponding to the rotational speed and throttle travel in the standard atmospheric condition is previously stored and set as a two-dimensional map, for outputting the stored and set value corresponding to the rotational speed and the throttle travel; and a CPU correcting the atmospheric pressure relational value including the atmospheric pressure calculated based on information of the intake air amount, rotational speed, charging efficiency, and throttle travel of the internal combustion engine by using the atmospheric pressure relational value including the atmospheric pressure calculated based on information of the rotational speed, throttle travel, and intake tube pressure of the internal combustion engine.Type: GrantFiled: May 2, 2002Date of Patent: April 20, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shuichi Wada, Koji Nishimoto, Norio Matsumoto
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Patent number: 6684153Abstract: A fuel nature judging device for an internal combustion engine includes a fuel nature judgment permitting device which determines that fuel nature judgment requirements are satisfied and permits fuel nature judgment when the cooling water temperature at the time of previous engine stop is higher than a reference temperature, when the cooling water temperature is lower than a reference water temperature, and when the deviation of the cooling water temperature from the intake air temperature is less than a reference deviation, a fuel nature judging device for judging fuel nature on the basis of a predetermined engine condition when fuel nature judgment is permitted, and a fuel nature judgment result storing device for storing the judgment result of the fuel nature judging device.Type: GrantFiled: November 16, 2001Date of Patent: January 27, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Shuichi Wada
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Patent number: 6622081Abstract: A catalyst deterioration detecting apparatus for an internal combustion engine which can ensure an enhanced reliability for catalyst deterioration decision by reflecting accurately a parameter value indicative of engine load in a counter value and by detecting positively temperature rise state of catalyst.Type: GrantFiled: May 6, 1999Date of Patent: September 16, 2003Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Shuichi Wada
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Publication number: 20030100989Abstract: There are provided, various sensors for detecting the operating state of the internal combustion engine; a rotational speed sensor, an air flow sensor, a throttle sensor, an intake air pressure sensor of an internal combustion engine; a storage where the charging efficiency corresponding to the rotational speed and throttle travel in the standard atmospheric condition is previously stored and set as a two-dimensional map, for outputting the stored and set value corresponding to the rotational speed and the throttle travel; and a CPU correcting the atmospheric pressure relational value including the atmospheric pressure calculated based on information of the intake air amount, rotational speed, charging efficiency, and throttle travel of the internal combustion engine by using the atmospheric pressure relational value including the atmospheric pressure calculated based on information of the rotational speed, throttle travel, and intake tube pressure of the internal combustion engine.Type: ApplicationFiled: May 2, 2002Publication date: May 29, 2003Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Shuichi Wada, Koji Nishimoto, Norio Matsumoto