Denso Corporation

Denso Corpora Tion

Denso International America, Inc.

Taiki Yasuzaka

Yasuo Kato

Tomohiro Itoh

Keiichirou Ishihara

Mitsuyuki Kobayashi

Shigeru Hasegawa

Hitoshi Amano

Makoto Kaneko

Jeffrey Meng

A leakage diagnosis device for an evaporative fuel treatment device includes a first vent valve, a second vent valve, and a pump. The first vent valve is configured to block a first atmospheric passage, which is a main passage of an atmospheric passage and connects a canister with an atmospheric opening. The second vent valve is configured to block a second atmospheric passage, which is a bypass passage of the first atmospheric passage and connects the canister with the atmospheric opening. The pump is provided on a side of the atmospheric opening relative to the second vent valve in the second atmospheric passage, and is configured to pressurize or depressurize the second atmospheric passage. A malfunction diagnosis device performs a malfunction diagnosis based on an output value of a pressure sensor, a current value of the pump, or an output value of an air-fuel ratio sensor.

Malfunction diagnosis device for leakage diagnosis device

A leakage diagnostic device diagnoses leakage of evaporated fuel in an evaporative fuel treatment device. The evaporative fuel treatment device purges evaporated fuel, which is generated in a fuel tank and adsorbed on a canister, to an intake passage. The leakage diagnostic device includes a vent valve that blocks a first atmospheric passage, which connects the canister with an atmospheric opening, and a pump that pressurizes and depressurizes a second atmospheric passage, which is a bypass passage of the first atmospheric passage. The malfunction diagnostic device diagnoses malfunction of the leakage diagnostic device based on an output value of a pressure sensor that detects pressure in a passage connected to the canister.

Malfunction diagnostic device for leakage diagnostic device

An evaporated fuel treatment device includes a fuel tank that stores fuel for an internal combustion engine, a canister that adsorbs evaporated fuel generated in the fuel tank, a pump that pressurizes and depressurizes a diagnostic target system including the fuel tank, a pressure detection unit that detects pressure in the diagnostic target system, a fuel state detection unit that detects a state of the fuel in the fuel tank, a leakage diagnosis unit that diagnoses leakages of evaporated fuel from the diagnostic target system, the diagnostic target system based on a change in a detection value detected by the pressure detection unit when the pump pressurizes or depressurizes the diagnostic target system, and a diagnosis determination unit that determines whether the leakage diagnosis unit performs the diagnosis based on a change in a state detection value detected by the fuel state detection unit.

Evaporated fuel treatment device

A leakage detecting device includes a first sensor, a second sensor, a pump, a leakage determination portion and a determination resetting portion. The first sensor, which is provided in a first passage connecting a fuel tank to a canister, detects density of vaporized fuel generated in the fuel tank. The second sensor, which is provided in a third passage connecting the canister to the pump, detects pressure in the third passage. The pump is provided between the third passage and an atmospheric passage. The leakage determination portion determines whether there is leakage in a vaporized fuel processing system or not, based on a time-variable amount of the pressure detected by the second sensor. The determination resetting portion resets a leakage determination result of the leakage determination portion, based on a time-variable amount of the density and the time-variable amount of the pressure.

Leakage detecting device for vaporized fuel

An engine off natural vacuum (EONV) evaporative fuel leak check system includes a fuel tank, a heat exchanger, an air duct, a fan, a fuel temperature sensor, and a controller. The fan directs air onto the heat exchanger, and the heat exchanger heats air passing around the heat exchanger in a heat exchange process using heat from engine coolant within the heat exchanger. The air duct extends between the fuel tank and the heat exchanger and the fan moves the heated air through the air duct toward the fuel tank. The controller is configured to control the fan for moving the heated air toward the fuel tank based on a temperature of the fuel within the fuel tank, as detected by the fuel temperature sensor.

Evaporative fuel leak check system

A pump casing has two external communication holes communicating with an outside. A partition member partitioning an interior of the pump casing into a first space and a second space. The first space communicates with the two external communication holes. The partition member have two internal communication holes communicating the first space with the second space. A first rotor member is rotatably accommodated in the first space. A second rotor member is rotatably accommodated in the second space. A torque switching unit is configured to switch between transmission of a running torque selectively to the first rotor member and transmission of the running torque to both the first rotor member and the second rotor member.

Rotational pump and fuel vapor leakage detection device having the same

A vibration insulating member is equipped between one component and an other component. The vibration insulating member includes a through hole forming portion and a contact portion. The through hole forming portion is formed of an elastic material to have a through hole in which a connection member is inserted to connect the one component with the other component. The contact portion is projected radially inward from an inner wall of the through hole forming portion. The contact portion has an inner wall on a radially inside. When the connection member is inserted in the through hole, an outer wall of the connection member forms a gap with the inner wall of the through hole forming portion and is in contact with the inner wall of the contact portion.

Vibration insulating member

A fuel vapor leak detection device for detecting a leakage of fuel vapor includes a pump which pressurizes or depressurizes insides of a fuel tank and a canister, a motor which drives the pump, an electrical current detector which detects a current value applied to the motor, a switching valve, and a controller. The switching valve includes an air passage having a narrowing part therein and communicating with atmosphere, a first passage connecting to the pump, a canister connection passage connecting to the canister, and a second passage connecting to the pump. The controller controls a switching operation of the switching valve based on the current value detected by the electrical current detector to select one of a communication between the air passage and the first passage, and a communication between the canister connection passage and the second passage.

Fuel vapor leak detection device

An upper casing receives a rotor, which is rotated by a drive force of a motor. The upper casing includes a pump chamber, which receives the rotor, a planar surface portion, which is formed around an opening of the pump chamber, and a through hole. A lower casing includes a planar surface portion, which is formed around the opening of the pump chamber, and a through hole. The lower casing closes the opening of the pump chamber to form the pump chamber in cooperation with the upper casing. A resilient sheet is placed between the lower casing and a mount portion of the motor and includes a through hole. A screw is received through the through holes of the upper casing, the lower casing and the resilient sheet to securely connect the upper casing, the lower casing and the resilient sheet to the mount portion. A lower casing side surface of the resilient sheet includes a plurality of primary protrusions.

Growing community of inventors

Kariya, Japan

Taiki Yasuzaka