Patents by Inventor Daisaku Asanuma

Daisaku Asanuma 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: 11035322
    Abstract: A pump module includes a pump section that discharges evaporated fuel generated in a fuel tank to an intake path of an internal combustion engine. The pump module also stores correction information for correcting a rotation speed of the pump section based on a difference between a reference discharge characteristic of a reference pump section at a predetermined rotation speed and a discharge characteristic of the pump section at the predetermined rotation speed.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: June 15, 2021
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventor: Daisaku Asanuma
  • Patent number: 10995686
    Abstract: An evaporated fuel processing device that includes a pump configured to supply purge gas, which includes evaporated fuel in a fuel tank, to an intake passage of an engine through a purge passage; a controller configured to control the pump; and a detecting unit configured to acquire a gas amount introduced to the intake passage while the pump is being driven in a stable state where an air amount introduced from open air to the intake passage is stable, and configured to detect, by using change in the acquired gas amount, a state where the purge gas is unable to be normally supplied from the purge passage to the intake passage.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: May 4, 2021
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventor: Daisaku Asanuma
  • Patent number: 10975809
    Abstract: When a purge control valve is in a supply state of supplying purge gas from a canister to an intake pipe and a pump is in operation, a concentration detector is configured to detect a concentration of the purge gas when the purge control valve is open in a case where a duty cycle of the purge control valve is not less than a predetermined value, and detect a concentration of the purge gas when the purge control valve is closed in a case where the duty cycle of the purge control valve is less than the predetermined value.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: April 13, 2021
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventor: Daisaku Asanuma
  • Patent number: 10968869
    Abstract: A device may determine whether there is a communicated point with open air between a pump and a control valve or on an opposite side to the control valve of the pump, by at least two of pressures: between the pump and the control valve in case the control valve is in a cutoff state, the switching valve is in a communication state, and the pump sends in forward direction, on an opposite side to the control valve of to the pump in case the control valve is in a communication state, the switching valve is in the cutoff state, and the pump sends in reverse direction; and between the pump and the control valve or on the opposite side to the control valve of the pump in case the valves are in the cutoff states and the pump is stopped after one of these cases.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: April 6, 2021
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventors: Nobuhiro Kato, Daisaku Asanuma
  • Patent number: 10907556
    Abstract: An evaporated fuel processing device may be provided with a canister configured to adsorb evaporated fuel evaporated in a fuel tank; a purge passage through which purge gas sent from the canister to the engine passes; a pump configured to send the purge gas from the canister to the intake passage; a control valve configured to switch between a communication state communicating the canister and the intake passage and a cutoff state cutting off the canister from the intake passage; a branch passage including one end connected to the purge passage on a downstream side relative to the pump and other end connected on an upstream side relative to the pump; and a concentration detector provided on the branch passage.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: February 2, 2021
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventors: Nobuhiro Kato, Daisaku Asanuma
  • Patent number: 10907585
    Abstract: An evaporated fuel processing device that determines whether a normal state is established, by using pressures by a pressure detector while the evaporated fuel processing device shifts between: a first state where a purge passage is opened by a first valve, air passage is opened by a second valve, the purge passage is closed by a third valve, and a pump stops; a second state, after the first state, where the purge passage is opened by the first valve, the air passage is opened by the second valve, the purge passage is closed by the third valve, and the pump is operating; and a third state which takes place after the second state and where the purge passage is opened by the first valve, the air passage is closed by the second valve, the purge passage is closed by the third valve, and the pump stops.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: February 2, 2021
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventor: Daisaku Asanuma
  • Patent number: 10859013
    Abstract: A pump module that is mounted in an evaporated fuel processing device configured to perform a purge process in which evaporated fuel in a fuel tank is supplied to an intake passage of an engine through a purge passage. The pump module may include: a pump configured to pump the evaporated fuel in the purge passage to the intake passage; and a pump controller configured to control drive of the pump. The pump controller may be configured to: during the purge process, drive the pump at a rotational speed equal to or lower than a rotational speed threshold until when a predetermined period has elapsed from a start of the purge process; and after the predetermined period has elapsed, drive the pump at a rotational speed equal to or higher than the rotational speed threshold.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: December 8, 2020
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventor: Daisaku Asanuma
  • Patent number: 10801429
    Abstract: In an internal combustion engine system, a controller is configured to: perform a purge control during execution of an A/F feedback learning; detect a purge concentration after execution of the A/F feedback learning; calculate an A/F feedback learning correction value adjusted by offsetting an A/F feedback learning value with a contributing value of the purge concentration; disable updating of the A/F feedback learning correction value after calculation of the A/F feedback learning correction value and until the purge control is stopped; and detect the purge concentration based on an air-fuel ratio deviation amount.
    Type: Grant
    Filed: October 8, 2019
    Date of Patent: October 13, 2020
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventor: Daisaku Asanuma
  • Patent number: 10787999
    Abstract: An evaporated fuel processing apparatus is provided with a canister to collect vapor, a purge passage to purge the vapor collected in the canister to an intake passage, a purge valve provided in the purge passage to regulate a purge flow rate of the vapor, a purge pump provided between the canister and the purge valve to pressure-feed the vapor from the canister to the purge passage, and a vapor pressure sensor to detect vapor pressure in the purge passage. An inside of the canister is communicated with the atmosphere, a capacity chamber (the canister) is provided upstream of the purge pump, and the vapor pressure sensor is provided in the purge passage between the purge valve and the purge pump.
    Type: Grant
    Filed: February 12, 2019
    Date of Patent: September 29, 2020
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventor: Daisaku Asanuma
  • Patent number: 10760533
    Abstract: A detecting unit that detects a specific pressure difference between a pressure of gas that has passed throuch a canister and a pump and a pressure of the gas before passing through the canister and the pump. A gas flow rate from the pump may be higher with a smaller pressure difference between upstream and downstream sides relative to the pump, and higher with a higher purge gas density. A gas flow rate from the canister may be lower with a smaller pressure difference between upstream and downstream sides relative to the canister, and lower with a higher purge gas density. An estimating unit may estimate a flow rate of the purge gas while the specific pressure difference is an unchanged pressure difference being a pressure at which the flow rate of the gas is not chanced by the density of the purge gas.
    Type: Grant
    Filed: April 5, 2018
    Date of Patent: September 1, 2020
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventors: Makoto Nakagawa, Daisaku Asanuma, Masanori Sugiura
  • Publication number: 20200256286
    Abstract: An evaporated fuel treatment apparatus is provided to determine pipe abnormalities (clogging or leakage) without discharging evaporated fuel to the atmosphere. The evaporated fuel processing apparatus includes an abnormality determination section for determining an abnormality of a vapor passage or a purge passage, drives a purge pump while an engine is operating, opens a purge control valve, sets the purge passage (upstream passage) and the vapor passage on the upstream side of the purge control valve to be under a negative pressure, and determines an abnormality of the vapor passage or the purge passage based on a pressure detected by a pressure sensor.
    Type: Application
    Filed: January 29, 2020
    Publication date: August 13, 2020
    Applicant: AISAN KOGYO KABUSHIKI KAISHA
    Inventor: Daisaku Asanuma
  • Publication number: 20200232422
    Abstract: When a purge control valve is in a supply state of supplying purge gas from a canister to an intake pipe and a pump is in operation, a concentration detector is configured to detect a concentration of the purge gas when the purge control valve is open in a case where a duty cycle of the purge control valve is not less than a predetermined value, and detect a concentration of the purge gas when the purge control valve is closed in a case where the duty cycle of the purge control valve is less than the predetermined value.
    Type: Application
    Filed: December 27, 2017
    Publication date: July 23, 2020
    Inventor: Daisaku Asanuma
  • Patent number: 10704500
    Abstract: An evaporated fuel processing device may comprise a canister, a control valve disposed on a purge passage and switching between a closed state being a state of closing the purge passage and an open state being a state of opening the purge passage, a pump disposed between the canister and the control valve, an acquiring unit acquiring a characteristic value related to a characteristic of the pump in a situation where the control valve is in the closed state and the pump pressurizes gas in the purge passage on a control valve side relative to the pump, and an estimating unit estimating a flow rate of the gas that the pump discharges to the purge passage on the control valve side when the control valve is in the open state, by using the acquired characteristic value.
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: July 7, 2020
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventors: Daisaku Asanuma, Nobuhiro Kato
  • Publication number: 20200208580
    Abstract: An evaporated fuel processing device may be provided with a canister configured to adsorb evaporated fuel evaporated in a fuel tank; a purge passage through which purge gas sent from the canister to the engine passes; a pump configured to send the purge gas from the canister to the intake passage; a control valve configured to switch between a communication state communicating the canister and the intake passage and a cutoff state cutting off the canister from the intake passage; a branch passage including one end connected to the purge passage on a downstream side relative to the pump and other end connected on an upstream side relative to the pump; and a concentration detector provided on the branch passage.
    Type: Application
    Filed: March 3, 2017
    Publication date: July 2, 2020
    Inventors: Nobuhiro KATO, Daisaku ASANUMA
  • Patent number: 10697408
    Abstract: A vehicle gas processing device is configured to supply gas generated by a vehicle to an intake pipe of a combustion engine. The device may includes: a gas pipe configured to communicate a gas generation source to the intake pipe, the gas pipe having a flexible end at least at an intake pipe side of the gas pipe; a check valve disposed between the intake pipe and the gas pipe, and configured to allow the gas to flow from the gas pipe toward the intake pipe and prohibit the gas to flow from the intake pipe toward the gas pipe; and a determining unit configured to determine that the gas pipe is detached from the check valve. The check valve is fixed to the intake pipe, and the gas pipe is detachably attached to the check valve.
    Type: Grant
    Filed: February 20, 2017
    Date of Patent: June 30, 2020
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventors: Daisaku Asanuma, Masanori Sugiura
  • Publication number: 20200166008
    Abstract: An evaporated fuel processing device that determines whether a normal state is established, by using pressures by a pressure detector while the evaporated fuel processing device shifts between: a first state where a purge passage is opened by a first valve, air passage is opened by a second valve, the purge passage is closed by a third valve, and a pump stops; a second state, after the first state, where the purge passage is opened by the first valve, the air passage is opened by the second valve, the purge passage is closed by the third valve, and the pump is operating; and a third state which takes place after the second state and where the purge passage is opened by the first valve, the air passage is closed by the second valve, the purge passage is closed by the third valve, and the pump stops.
    Type: Application
    Filed: June 8, 2018
    Publication date: May 28, 2020
    Inventor: Daisaku Asanuma
  • Publication number: 20200149485
    Abstract: In an internal combustion engine system, a controller is configured to: perform a purge control during execution of an A/F feedback learning; detect a purge concentration after execution of the A/F feedback learning; calculate an A/F feedback learning correction value adjusted by offsetting an A/F feedback learning value with a contributing value of the purge concentration; disable updating of the A/F feedback learning correction value after calculation of the A/F feedback learning correction value and until the purge control is stopped; and detect the purge concentration based on an air-fuel ratio deviation amount.
    Type: Application
    Filed: October 8, 2019
    Publication date: May 14, 2020
    Applicant: AISAN KOGYO KABUSHIKI KAISHA
    Inventor: Daisaku ASANUMA
  • Publication number: 20200141359
    Abstract: A detecting unit that detects a specific pressure difference between a pressure of gas that has passed throuch a canister and a pump and a pressure of the gas before passing through the canister and the pump. A gas flow rate from the pump may be higher with a smaller pressure difference between upstream and downstream sides relative to the pump, and higher with a higher purge gas densiy. A gas flow rate from the canister may be lower with a smaller pressure difference between upstream and downstream sides relative to the canister, and lower with a higher purge gas density. An estimating unit may estimate a flow rate of the purge gas while the specific pressure difference is an unchanged pressure difference being a pressure at which the flow rate of the gas is not chanced by the density of the purge gas.
    Type: Application
    Filed: April 5, 2018
    Publication date: May 7, 2020
    Inventors: Makoto Nakagawa, Daisaku Asanuma, Masanori Sugiura
  • Publication number: 20200116091
    Abstract: The evaporated fuel processing device may include a pump unit including a pump body configured to pump out evaporated fuel generated in a fuel tank to an intake passage, and a pump controller configured to drive the pump body; and a controller configured to cause the pump controller to control the pump body. When an index related to a temperature of the pump unit exceeds a predetermined range, the controller may restrict the driving of the pump body.
    Type: Application
    Filed: April 25, 2018
    Publication date: April 16, 2020
    Inventor: Daisaku Asanuma
  • Patent number: 10598107
    Abstract: An evaporated fuel processing device including a pump sending a purge gas from a canister to an intake passage, a control valve switching between a communication state and a cutoff state where the canister and the intake passage are cut off on the purge passage, a return flow passage having one end connected to the purge passage between the pump and the control valve, and other end connected to an upstream side of the pump, wherein the purge gas flows from the one end to the other end in a case where the pump is activated in the cutoff state of the control valve, and a detecting device specifying an evaporated fuel concentration in the return flow passage during the cutoff state of the control valve in a case where the control valve is controlled based on the duty ratio and the pump is activated.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: March 24, 2020
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventors: Daisaku Asanuma, Nobuhiro Kato