Patents by Inventor Tatsuhiko Takahashi
Tatsuhiko Takahashi 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: 20180298810Abstract: To provide controller and control method for internal combustion engine that can suppress motor built in actuator from overheating when waste gate valve is controlled to near fully closed position or fully opened position, and can suppress from causing deterioration of fuel efficiency by consuming large power wastefully even in light load operation region in which pressure of exhaust gas is low relatively. A controller for internal combustion engine calculates basic operating amount for bringing real opening degree close to target opening degree; calculates an operating amount obtained by performing upper limitation of basic operating amount by first limit value, as final operating amount, in case of supercharging driving state; and calculates an operating amount obtained by performing upper limitation of basic operating amount by second limit value smaller than first limit value, as final operating amount, in case of non-supercharging driving state.Type: ApplicationFiled: August 29, 2017Publication date: October 18, 2018Applicant: Mitsubishi Electric CorporationInventors: Takahiko ONO, Tatsuhiko TAKAHASHI
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Publication number: 20180100455Abstract: The present invention provides a controller and a control method for an internal combustion engine, which can suppress the generation of an annoying collision noise and abnormal heating of a motor of an actuator, which are generated by contact of the output shaft of the actuator with an opening side stopper of the actuator. The controller and the control method for the internal combustion engine are configured such that a target opening (Sv) of the valve is set to the smaller of: a required target opening (Sv_dem) computed so that a target supercharging pressure (Sp) and an actual supercharging pressure (Pp) are matched with each other; and a restricted target opening (Sv_lmt) computed based on a fully closed position learning value (Pv_lrn), which corresponds to an actual position detected by a position sensor, when the valve is located in the fully closed position, and on the restricted target position.Type: ApplicationFiled: May 22, 2017Publication date: April 12, 2018Applicant: Mitsubishi Electric CorporationInventors: Tatsuhiko TAKAHASHI, Takahiko ONO
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Publication number: 20170306834Abstract: In a control system for an internal combustion engine, the waste gate actuator controls the opening and closing of a waste gate valve according to operation amount controlled by the control device, an actual position of the waste gate actuator detected by the position sensor for detecting the position of the waste gate actuator which correlates to the actual open position of a waste gate valve is inputted to the control device, the control device performs control for limiting the operation amount to stop to predetermined opening deviation in the direction toward open side from open side stopper position of the waste gate.Type: ApplicationFiled: September 8, 2016Publication date: October 26, 2017Applicant: Mitsubishi Electric CorporationInventors: Tatsuhiko TAKAHASHI, Takahiko ONO
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Patent number: 7950365Abstract: A control apparatus for an internal combustion engine includes an oil pressure regulating valve having a solenoid, a variable cam phase mechanism for changing a cam phase, and an ECU for controlling the oil pressure regulating valve. The ECU includes an actual cam phase detecting unit, a target cam phase setting unit, a feedback control unit, a coil temperature detecting unit, a circuit resistance calculating unit, and an integral term initial value calculating unit. When an integral term is initialized, the feedback control unit sets the holding output duty as the integral term.Type: GrantFiled: December 19, 2008Date of Patent: May 31, 2011Assignee: Mitsubishi Electric CorporationInventors: Toru Tanaka, Shinji Watanabe, Tatsuhiko Takahashi, Masayoshi Ito
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Patent number: 7681540Abstract: Provided is a control apparatus for an internal combustion engine which controls the internal combustion engine in such a manner as to prevent excessive overshoot of an actual phase angle at a time of phase angle feedback control.Type: GrantFiled: June 26, 2008Date of Patent: March 23, 2010Assignee: Mitsubishi Electric CorporationInventors: Shinji Watanabe, Toru Tanaka, Tatsuhiko Takahashi
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Publication number: 20090306874Abstract: Provided is a control apparatus for an internal combustion engine, capable of improving a response characteristic of a PID feedback control, including: an oil pressure regulating valve having a solenoid; a variable cam phase mechanism for changing a cam phase; and an ECU for controlling the oil pressure regulating valve.Type: ApplicationFiled: December 19, 2008Publication date: December 10, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Toru Tanaka, Shinji Watanabe, Tatsuhiko Takahashi, Masayoshi Ito
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Publication number: 20090125216Abstract: Provided is a control apparatus for an internal combustion engine which controls the internal combustion engine in such a manner as to prevent excessive overshoot of an actual phase angle at a time of phase angle feedback control.Type: ApplicationFiled: June 26, 2008Publication date: May 14, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shinji WATANABE, Toru Tanaka, Tatsuhiko Takahashi
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Patent number: 7484497Abstract: Provided is a control device for an internal combustion engine, including a crank angle sensor, a cam angle sensor, a real phase angle detector for detecting a real phase angle of a cam shaft based on a detection signal of the sensors, a target phase angle setting unit including a temperature parameter and battery voltage, for setting a target phase angle of the cam shaft based on an operating state of the internal combustion engine, and a phase angle feedback control unit for conducting feedback control operation so that the real phase angle coincides with the target phase angle, and for calculating an operation quantity to a hydraulically controlled solenoid valve, in which the feedback control unit sets an integral term initial value when starting the feedback control operation according to the temperature parameter, corrects a control correction quantity by the battery voltage, and outputs the operation quantity to the solenoid valve.Type: GrantFiled: December 28, 2007Date of Patent: February 3, 2009Assignee: Mitsubishi Electric CorporationInventors: Shinji Watanabe, Toru Tanaka, Tatsuhiko Takahashi
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Publication number: 20080288155Abstract: Provided is a control device for an internal combustion engine, including a crank angle sensor, a cam angle sensor, a real phase angle detector for detecting a real phase angle of a cam shaft based on a detection signal of the sensors, a target phase angle setting unit including a temperature parameter and battery voltage, for setting a target phase angle of the cam shaft based on an operating state of the internal combustion engine, and a phase angle feedback control unit for conducting feedback control operation so that the real phase angle coincides with the target phase angle, and for calculating an operation quantity to a hydraulically controlled solenoid valve, in which the feedback control unit sets an integral term initial value when starting the feedback control operation according to the temperature parameter, corrects a control correction quantity by the battery voltage, and outputs the operation quantity to the solenoid valve.Type: ApplicationFiled: December 28, 2007Publication date: November 20, 2008Applicant: Mitsubishi Electric CorporationInventors: Shinji Watanabe, Toru Tanaka, Tatsuhiko Takahashi
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Patent number: 7240671Abstract: To prevent RPM decrease, misfire, and engine stall by refraining from correcting, the amount of fuel to shift an air-fuel ratio toward a lean side to the extent of exceeding a combustion limit when the internal combustion engine operates at a low load, a control apparatus is provided for controlling operation of an internal combustion engine. The apparatus includes an air-fuel ratio state determiner, a characteristic retainer and a fuel correction amount calculator, in which a coolant temperature coefficient of a coolant temperature coefficient characteristic is set to be smaller than a constant value in a region where a coolant temperature is lower than a constant temperature.Type: GrantFiled: March 13, 2006Date of Patent: July 10, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Tatsuhiko Takahashi
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Publication number: 20070089720Abstract: To prevent RPM decrease, misfire, and engine stall by refraining from correcting, the amount of fuel to shift an air-fuel ratio toward a lean side to the extent of exceeding a combustion limit when the internal combustion engine operates at a low load, a control apparatus is provided for controlling operation of an internal combustion engine. The apparatus includes: air-fuel ratio state determining means; characteristic retaining means; and fuel correction amount calculating means, in which a coolant temperature coefficient of a coolant temperature coefficient characteristic is set to be smaller than a constant value in a region where a coolant temperature is lower than a constant temperature.Type: ApplicationFiled: March 13, 2006Publication date: April 26, 2007Inventor: Tatsuhiko Takahashi
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Patent number: 6953025Abstract: By controlling a high pressure pump with the use of a cam angle signal so as to open it and then close it after the lapse of a prescribed period corresponding to an amount of discharge, a fuel supply control apparatus for an internal combustion engine is capable of achieving the simplification of control while ensuring controllability without requiring correction even if valve timing is changed. A crank angle sensor generates a crank angle signal SGT in synchronization with the rotation of a crankshaft so as to supply the fuel in a fuel tank to an injector installed in a combustion chamber of each engine cylinder. A cam angle sensor generates the cam angle signal SGC in synchronization with the rotation of a camshaft. A high pressure pump has a suction stroke and a discharge stroke synchronized with the rotation of the camshaft and supplies the fuel to the injector. An ECU changes an effective stroke related to an exhaust stroke of the pump based on the cam angle signal SGC.Type: GrantFiled: February 11, 2004Date of Patent: October 11, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Tatsuhiko Takahashi
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Patent number: 6923150Abstract: A valve timing control system for an internal combustion engine is provided, which includes: a crank angle sensor detecting a crank angle corresponding to an internal combustion engine crank shaft rotational angle; an actuator relatively modifying phases of a cam angle with the crank angle; a cam angle sensor detecting the cam angle modified by the actuator; an oil control valve driving the actuator; a target value detection unit calculating a target value according to the internal combustion engine operation state; a cam angle control unit controlling the detected cam angle to coincide with the calculated target value; a learning unit learning a control signal to the oil control valve when the cam angle substantially coincides with the target value; and a failure detection unit detecting failure of the actuator. The failure detection unit modifies a failure detection condition according to whether learning is performed in the learning unit.Type: GrantFiled: September 5, 2003Date of Patent: August 2, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Tatsuhiko Takahashi
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Patent number: 6889540Abstract: The present invention has: a crank signal vane in which teeth are provided on a circumference at predetermined crank angles, and a first missing tooth portion having one missing tooth and a second missing tooth portion having two missing teeth are established; a crank angle sensor for outputting a pulse shape crank signal pattern corresponding to the teeth; and an electronic control unit for calculating a crank signal period based on the crank signal pattern, computing a missing tooth identification value based on the calculated crank signal period; detecting the number of missing teeth based on the computed missing tooth identification value, detecting a crank angle reference position for cases in which the detected number of missing teeth is one or two, and identifying a cylinder group.Type: GrantFiled: May 9, 2003Date of Patent: May 10, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shiro Yonezawa, Akira Furuta, Yasuyoshi Hori, Hideki Hagari, Tatsuhiko Takahashi
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Patent number: 6880504Abstract: A valve timing control apparatus for an internal combustion engine can be improved in accuracy in the detection of valve timing (cam angles). A crank angle sensor generates a crank angle signal in the form of a train of pulses. Cam angle changing parts change phases of camshafts relative to a crankshaft. Cam angle sensors generate cam angle signals. A reference crank angle detection part detects reference crank angles based on the crank angle signal. Cam angle calculation parts calculate the cam angles of the camshafts based on the crank angle signal and the cam angle signals. A cam angle control part controls the relative phases of the camshafts to the crankshaft so as make them coincide with target cam angles corresponding to operating conditions of the engine. A cam angle calculation part calculates the cam angles by counting the number of pulses of the crank angle signal.Type: GrantFiled: December 6, 2002Date of Patent: April 19, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Tatsuhiko Takahashi
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Publication number: 20050045158Abstract: By controlling a high pressure pump with the use of a cam angle signal so as to open it and then close it after the lapse of a prescribed period corresponding to an amount of discharge, a fuel supply control apparatus for an internal combustion engine is capable of achieving the simplification of control while ensuring controllability without requiring correction even if valve timing is changed. A crank angle sensor generates a crank angle signal SGT in synchronization with the rotation of a crankshaft so as to supply the fuel in a fuel tank to an injector installed in a combustion chamber of each engine cylinder. A cam angle sensor generates the cam angle signal SGC in synchronization with the rotation of a camshaft. A high pressure pump has a suction stroke and a discharge stroke synchronized with the rotation of the camshaft and supplies the fuel to the injector. An ECU changes an effective stroke related to an exhaust stroke of the pump based on the cam angle signal SGC.Type: ApplicationFiled: February 11, 2004Publication date: March 3, 2005Inventor: Tatsuhiko Takahashi
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Publication number: 20040237916Abstract: A valve timing control system for an internal combustion engine is provided, which includes: a crank angle sensor detecting a crank angle corresponding to an internal combustion engine crank shaft rotational angle; an actuator relatively modifying phases of a cam angle with the crank angle; a cam angle sensor detecting the cam angle modified by the actuator; an oil control valve driving the actuator; a target value detection unit calculating a target value according to the internal combustion engine operation state; a cam angle control unit controlling the detected cam angle to coincide with the calculated target value; a learning unit learning a control signal to the oil control valve when the cam angle substantially coincides with the target value; and a failure detection unit detecting failure of the actuator. The failure detection unit modifies a failure detection condition according to whether learning is performed in the learning unit.Type: ApplicationFiled: September 5, 2003Publication date: December 2, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventor: Tatsuhiko Takahashi
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Patent number: 6802286Abstract: The valve timing control system of the present invention comprises an actuator for changing an actual valve timing of an intake valve or an exhaust valve; an oil pressure adjusting unit for supplying operating oil to the actuator, and adjusting the oil pressure thereof; an actual valve timing control unit for controlling the actuator by controlling the oil pressure adjusting unit, so that the actual valve timing follows up a target value; and an oil temperature estimation unit for estimating the temperature of the operating oil, according to an operating state of the internal combustion engine from a previous operation, and according to its current operating state. Based on the estimated oil temperature, the actual valve timing control unit switches a control amount for controlling the oil pressure adjusting unit.Type: GrantFiled: April 24, 2003Date of Patent: October 12, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Morio Fujiwara, Tatsuhiko Takahashi, Koji Wada
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Patent number: 6776033Abstract: A cylinder identifying apparatus has a generator which generates a cylinder discrimination signal, a generator which generates a crank angle position signal, and a control unit which obtains the number of detections of the crank angle position signal, the number of detections of the cylinder discrimination signal, the number of detections of the crank angle position signal at the time of detection of the cylinder discrimination signal, etc. The control unit sets a cylinder discrimination period B35° to B75° CA if the present reference crank position is a first-time detection result after startup, sets a cylinder discrimination period B75° to B75° CA if the present reference crank position is a second-time or some other subsequent detection result, obtains the number of detections of the cylinder discrimination signal, and identifies a cylinder on the basis of the number of pulse dropouts and the number of detections of the cylinder discrimination signal.Type: GrantFiled: December 3, 2002Date of Patent: August 17, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yasuyoshi Hori, Shiro Yonezawa, Akira Furuta, Hideki Hagari, Tatsuhiko Takahashi
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Patent number: 6761138Abstract: Valve timing control apparatus for internal combustion engine includes a cam phase actuator (1113) composed of a first rotor (1) rotatable with a crank, a second rotor (6) fixed on a cam shaft (7) for actuating an intake or exhaust valve, and a lock mechanism (15, 16, 17, 18) for locking the second rotor to the first rotor at a first angle, a pump (1118) for generating a hydraulic pressure, an ECU (1117) for determining a current value for releasing a locked state at the first angle for shifting to a second angle, and an oil control valve (1114) for regulating a cam phase of the second rotor. The ECU determines a locked state or an unlocked state of the lock mechanism to allow the second rotor to be released from being locked to the first rotor when the lock mechanism is in the locked state.Type: GrantFiled: October 28, 2002Date of Patent: July 13, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tatsuhiko Takahashi, Koji Wada