Patents by Inventor Naoyuki TAGAWA
Naoyuki TAGAWA 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: 20160298577Abstract: An evaporated fuel processing device has a canister, a vapor passage, a purge passage, a shutoff valve, a storage device and a control device. The canister includes an adsorbent material that adsorbs evaporated fuel generated in a fuel tank. The vapor passage connects the canister and the fuel tank. The purge passage connects the canister and an intake passage of an engine. The shutoff valve is provided in the vapor passage, and adjusts flow rate of gas flowing through the vapor passage. The storage device stores in advance a reference value for the shutoff valve corresponding to internal pressure of the fuel tank. The shutoff valve is controlled based on the reference value, which is obtained from the internal pressure of the fuel tank, and pressure release control is performed on the fuel tank.Type: ApplicationFiled: September 1, 2014Publication date: October 13, 2016Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Junya KIMOTO, Yoshikazu MIYABE, Naoyuki TAGAWA
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Patent number: 9421490Abstract: A fuel vapor processing apparatus may include a canister, a closing valve provided in a vapor passage connecting the canister and the fuel tank, an actuator coupled to the movable valve member, and a control device coupled to the actuator. The control device may perform a learning control, in which a valve opening start position is learned based on a stroke distance of the movable valve member, which is given at the time when an internal pressure of the fuel tank is reduced by a predetermined pressure value while the moving distance of the movable valve member is changed such that (a) the movable valve member moves from the reference position to a learning start position at a first speed in a valve opening direction and (b) the movable valve member moves further from the learning start position at a second speed in the valve opening direction.Type: GrantFiled: November 25, 2014Date of Patent: August 23, 2016Assignee: AISAN KOGYO KABUSHIKI KAISHAInventors: Junya Kimoto, Yuzuru Ito, Naoyuki Tagawa, Yoshikazu Miyabe, Minoru Akita
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Patent number: 9382866Abstract: A fuel supplier for a motor vehicle, having a fuel tank and an internal combustion engine, includes a fuel pump pumping fuel from the fuel tank to the internal combustion engine, a motor driving the fuel pump, and a control unit carrying out feedback control of duty ratio of voltage applied to the motor such that the actual fuel pressure comes close to a target fuel pressure. The control unit increases a low limit value of the duty ratio in accordance with the change of an accelerator open ratio in an opening direction.Type: GrantFiled: December 18, 2013Date of Patent: July 5, 2016Assignee: AISAN KOGYO KABUSHIKI KAISHAInventors: Minoru Akita, Naoyuki Tagawa
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Publication number: 20160108865Abstract: A fuel vapor processing apparatus may include a canister, a purge passage connecting the canister and an engine, a vapor passage connecting the canister and a fuel tank, a closing valve disposed in the vapor passage, a pressure detection device for detecting a pressure within the fuel tank, and a controller coupled to the closing valve and the pressure detection device. The controller may output a control signal to the closing valve for opening the closing valve or for closing the closing valve. The controller may include an abnormality determination device that may determine whether or not the pressure detection device is operating properly based a detection value of the pressure detection device detected at a time when the engine is inactive and after the controller outputs the control signal to the closing valve for opening the closing valve or for closing the closing valve.Type: ApplicationFiled: October 15, 2015Publication date: April 21, 2016Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Naoyuki TAGAWA, Minoru AKITA, Yoshikazu MIYABE
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Publication number: 20160076495Abstract: A fuel-supply system has a fuel pump, a pressure controller, a signal output device and a power switch. The pressure controller adjusts the observed fuel pressure of the fuel and may electronically communicate with a motor driving the fuel pump to regulate the supply of fuel from a fuel tank of the fuel-supply system to an engine. In detail, the pressure controller performs feedback control of a voltage applied to the motor such that the pressure of a fuel pumped from the fuel pump approaches to have a first target and/or ideal fuel pressure value. Further, the signal output device outputs the first target fuel pressure value to the pressure controller. Activation of the power switch supplies power, from a power source, to the pressure controller, the motor and the signal output device. Further, the pressure controller may perform feedback control based on a second target fuel pressure value.Type: ApplicationFiled: September 16, 2015Publication date: March 17, 2016Inventors: Naoyuki TAGAWA, Minoru AKITA
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Publication number: 20150330346Abstract: A fuel supply system may include a fuel pump configured to supply fuel from a fuel tank to a target, a motor for driving the fuel pump, and a controller coupled to the motor. The controller may determine a duty ratio of a control signal through a feedback control and to output the control signal to the motor, so that a fuel pressure of the fuel supplied from the fuel tank approaches a target fuel pressure. The controller may estimate the duty ratio based on the target fuel pressure and information regarding a fuel pressure of the fuel supplied from the fuel tank, and may guard an upper limit of the duty ratio by an upper limit guard value. The upper limit guard value may be determined based on a rotational speed of the motor.Type: ApplicationFiled: May 14, 2015Publication date: November 19, 2015Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Naoyuki TAGAWA, Minoru AKITA
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Publication number: 20150330337Abstract: A fuel vapor processing apparatus may include a vapor passage connecting a canister and a fuel tank of an engine system. An opening and closing valve may be disposed in the vapor passage. A valve opening device may be coupled to the opening and closing valve and may forcibly open the valve when the internal pressure of the fuel tank detected by a pressure has reached to a set pressure value.Type: ApplicationFiled: May 8, 2015Publication date: November 19, 2015Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Naoyuki TAGAWA, Yoshikazu MIYABE, Minoru AKITA
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Publication number: 20150322902Abstract: A vaporized fuel treating device having a canister that is configured to adsorb vaporized fuel in a fuel tank and to feed the adsorbed vaporized fuel to an engine may include a pressure sensor that is configured to periodically detect an inner pressure of the fuel tank, and a pressure sensor failure determination device that is configured to determine that the pressure sensor has failed when a change of the inner pressure detected by the pressure sensor in a unit of time is not less than a predetermined pressure value that is greater than a maximum value of possible pressure changes within the fuel tank.Type: ApplicationFiled: May 8, 2015Publication date: November 12, 2015Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Minoru AKITA, Yoshikazu MIYABE, Naoyuki TAGAWA
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Publication number: 20150292447Abstract: A vaporized fuel processing apparatus has a fuel tank, a canister configured to adsorb vaporized fuel, a vapor path connecting the canister to the fuel tank, a closing valve provided in the vapor path, a pressure sensor measuring inner pressure of the fuel tank, and an electric control unit connected with the closing valve and the pressure sensor. The electric control unit is configured to close or open the closing valve in order to initialize the closing valve or open the closing valve in order to release the vaporized fuel from the fuel tank. Further, the electric control unit is configured to detect failure of the closing valve depending on change in the inner pressure of the fuel tank within a predetermined time from when the closing valve is opened or is closed for initialization of the closing valve or release of the vaporized fuel from the fuel tank.Type: ApplicationFiled: April 13, 2015Publication date: October 15, 2015Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Naoyuki TAGAWA, Minoru AKITA, Yoshikazu MIYABE
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Publication number: 20150159577Abstract: A fuel supply system for an internal combustion engine has a fuel pump capable of pumping fuel from a fuel tank to the internal combustion engine, a motor driving the fuel pump, a pressure sensor configured to detect pressure of the fuel pumped from the fuel pump, and a control unit configured to output control signals to the motor. The control unit is configured to perform feedback control of duty ratio of the control signals for the motor, and to control the duty lower limit guard value in order to limit an amount of decreases of the duty lower limit guard value in the step-like manner when a duty lower limit guard value decreases.Type: ApplicationFiled: December 9, 2014Publication date: June 11, 2015Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Minoru AKITA, Naoyuki TAGAWA
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Publication number: 20150159598Abstract: A vaporized fuel processing apparatus has a canister capable of adsorbing vaporized fuel generated in a fuel tank, a vapor path connecting the canister to the fuel tank, a closing valve provided in the vapor path, a purge path connecting the canister to an intake path of an engine, a pressure sensor for detecting the inner pressure of the fuel tank, and an electric control unit controlling the vaporized fuel processing apparatus. When the inner pressure of the fuel tank is in excess of the measurement range of the pressure sensor, the learning of the valve opening start position is prohibited, and pre-learning depressurization control is performed through change of the stroke amount of the closing valve in the valve opening direction until the inner pressure of the fuel tank is within the measurement range of the pressure sensor.Type: ApplicationFiled: December 5, 2014Publication date: June 11, 2015Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Naoyuki TAGAWA, Minoru AKITA, Yoshikazu MIYABE
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Publication number: 20150159567Abstract: A vaporized fuel processing apparatus has a canister loaded with an adsorbent capable of adsorbing vaporized fuel generated in a fuel tank, a closing valve provided a vapor path connecting the canister and the fuel tank and having a valve seat and a valve movable portion such that a distance between the valve seat and the valve movable portion is stroke amount, a pressure sensor configured to detect inner pressure of the fuel tank, and an electric control unit. The electric control unit is configured to perform abnormal state depressurization control of the fuel tank, in a state that the pressure sensor cannot detect the inner pressure of the fuel tank, by setting the stroke amount of the closing valve at a fail-safe value in which the closing valve is closed, and then changing the stroke amount in a valve opening direction of the closing valve from the fail-safe value.Type: ApplicationFiled: December 5, 2014Publication date: June 11, 2015Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Minoru AKITA, Yoshikazu MIYABE, Naoyuki TAGAWA
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Publication number: 20150159566Abstract: A vaporized fuel processing apparatus has a closing valve provided in a vapor path connecting an adsorbent canister to the fuel tank, a pressure sensor configured to detect the inner pressure of the fuel tank, and an electric control unit configured to determine whether the amount of increase in the inner pressure of the fuel tank is within an acceptable range or not, to learn a valve opening start position of the closing valve when the inner pressure of the fuel tank is reduced by an amount not less than a predetermined value, and to stop or prohibit the learning of the valve opening start position of the closing valve when the amount of increase in the inner pressure of the fuel tank is not within the acceptable range during or before the learning of the valve opening start position of the closing valve.Type: ApplicationFiled: December 5, 2014Publication date: June 11, 2015Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Minoru AKITA, Yoshikazu MIYABE, Naoyuki TAGAWA
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Publication number: 20150159568Abstract: A vaporized fuel processing apparatus has a canister capable of adsorbing vaporized fuel generated in a fuel tank, a closing valve provided in the vapor path connecting the canister and the fuel tank and having a valve seat and a valve movable portion, a pressure sensor configured to detect inner pressure of the fuel tank, and an electric control unit. The electric control unit is configured to set a learning value that is an axial distance between the valve seat and the valve movable portion at a valve opening start position at a fail-safe value such that the closing valve is in the valve closing state when the inner pressure of the fuel tank decreases by less than a predetermined value after repeating a stroke control process more than predetermined times.Type: ApplicationFiled: December 8, 2014Publication date: June 11, 2015Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Naoyuki TAGAWA, Minoru AKITA, Yoshikazu MIYABE
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Publication number: 20150143996Abstract: A fuel vapor processing apparatus may include a canister, a closing valve provided in a vapor passage connecting the canister and the fuel tank, an actuator coupled to the movable valve member, and a control device coupled to the actuator. The control device may perform a learning control, in which a valve opening start position is learned based on a stroke distance of the movable valve member, which is given at the time when an internal pressure of the fuel tank is reduced by a predetermined pressure value while the moving distance of the movable valve member is changed such that (a) the movable valve member moves from the reference position to a learning start position at a first speed in a valve opening direction and (b) the movable valve member moves further from the learning start position at a second speed in the valve opening direction.Type: ApplicationFiled: November 25, 2014Publication date: May 28, 2015Inventors: Junya KIMOTO, Yuzuru ITO, Naoyuki TAGAWA, Yoshikazu MIYABE, Minoru AKITA
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Publication number: 20150144111Abstract: A fuel vapor processing apparatus may include a canister capable of adsorbing fuel vapor produced in a fuel tank, a closing valve provided in a vapor passage connecting the canister and the fuel tank, a purge passage connecting the canister and an intake passage of an engine, and a control device. The closing valve may include a movable valve member movable along a linear path and an actuator coupled to the movable valve member. The control device may be coupled to the actuator and may be configured to control the actuator such that the position of the movable valve member along the linear path changes according to a deviation of an actual tank internal pressure of the fuel tank from a target tank internal pressure.Type: ApplicationFiled: November 14, 2014Publication date: May 28, 2015Applicant: AISAN KOGYO KABUSHIKI KAISHAInventors: Minoru AKITA, Yoshikazu MIYABE, Naoyuki TAGAWA
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Publication number: 20140174403Abstract: A fuel supplier for a motor vehicle, having a fuel tank and an internal combustion engine, includes a fuel pump pumping fuel from the fuel tank to the internal combustion engine, a motor driving the fuel pump, and a control unit carrying out feedback control of duty ratio of voltage applied to the motor such that the actual fuel pressure comes close to a target fuel pressure. The control unit increases a low limit value of the duty ratio in accordance with the change of an accelerator open ratio in an opening direction.Type: ApplicationFiled: December 18, 2013Publication date: June 26, 2014Applicant: AISIAN KOGYO KABUSHIKI KAISHAInventors: Minoru AKITA, Naoyuki TAGAWA