Denso Corporation

Denso Corpora Tion

Kosei Takagi

Tomohiro Itoh

Shigeru Hasegawa

Ryoyu Kishi

Makoto Kaneko

Yasuo Kato

Shuhei Oe

Mitsuyuki Kobayashi

Takashi Ooga

Kazuhiro Sasao

Ryoyuu Kishi

Takehiro Tanaka

Yuusuke Yasuki

Shinya Nakata

An evaporated fuel processing device is configured to collect evaporated fuel from a fuel tank of an internal combustion engine. The evaporated fuel processing device includes the fuel tank, a canister, a tank sealing valve, a switching valve, and a differential pressure sensor. The fuel tank stores fuel for the internal combustion engine. The canister adsorbs evaporated fuel generated in the fuel tank. The switching valve switches between allowing and blocking off communication between the canister and open air. The differential pressure sensor detects a system differential pressure between the pressure on the canister side of the tank sealing valve and the pressure on the fuel tank side of the tank sealing valve in the detection target system.

Evaporated fuel processing device

A first plate portion covers one opening of a pump chamber of a tubular portion, and a second plate portion covers the other opening of the pump chamber along a center axis of the tubular portion. A hole forming portion is equipped to an outside of the tubular portion to form a connection hole. A length of the hole forming portion along the center axis is less than or equal to a length of the tubular portion along the center axis. A first imaginary line connects a center of an outer opening of the connection hole with a point on the center axis. The first imaginary line intersects perpendicularly with the center axis. A length of the connection hole in a direction perpendicular to both the first imaginary line and the center axis is greater than a length of the connection hole along the center axis.

Vane pump and fuel vapor leakage detection device using the same

An inspection apparatus includes a pressure sensor, a reference orifice, a pump, and a switching valve. The reference orifice is disposed in a first communication passage communicating a pressure passage receiving the pressure sensor, with a tank passage communicating with a fuel tank. The pump depressurizing or pressurizing the pressure passage includes an intake port and a discharge port, and one of which communicates with an atmospheric passage communicating with the atmosphere and the other one communicates with the pressure passage. The switching valve and switches between a state shutting off a communication of a second communication passage that leads to the pressure passage and passages other than the pressure passage and communicating the atmospheric passage with the tank passage and a state shutting off a communication of the atmospheric passage and passages other than the pump and the atmosphere and communicating the second communication passage with the tank passage.

Inspection apparatus and inspection method

A filter element is accommodated in a filter case. A housing is affixed to the filter case. A partition plate is located between the filter case and the housing. A switching valve is equipped in the housing. The switching valve includes a solenoid actuator, a valve, and a valve seat member. A vibration transmission member is located on one side in a driving direction of the valve relative to the valve seat member. The vibration transmission member is in contact with the switching valve at one end and is in contact with the partition plate at the other end. The vibration transmission member transmits oscillation, which is caused when the valve is seated on the valve seat, to the filter element through the partition plate.

Fuel vapor leakage detection device and method for controlling the same

A housing receiving a switching valve, a pressure sensor, and a pump includes a tubular portion having an inner wall provided with a support portion into which an attachment portion is inserted. The pump includes a pump portion and a motor portion which are connected to the attachment portion. The support portion receives an elastic member abutting on the attachment portion. The elastic member prevents a vibration generated due to an operation of the pump from being transmitted to the tubular portion. Since the pump is supported by a cover through a pressure detection pipe including a pressure detection passage and is supported by the tubular portion through the elastic member and the support portion, the pump prevents from vibrating by its weight. Therefore, a noise radiated out of the housing due to the vibration transmitted from the pump to the housing can be reduced.

Fuel-vapor leakage detector

A first tubular portion has a cross sectional shape which is a non-perfect circle relative to an axis thereof. A second tubular portion is disposed concentrically with the first tubular portion. The second tubular portion has a cross sectional shape relative to its axis, which is a congruent shape of the cross sectional shape of the first tubular portion. A sealing member is disposed between the first tubular portion and the second tubular portion for sealing therebetween. The sealing member has a cross sectional shape of which length parallel to its axis is greater than length which is perpendicular to the axis.

Assembling unit, pump and fuel-vapor-leakage check system

An ECU controls a selector valve so as to connect a first pump passage and a second pump passage, and determines whether a fuel vapor leak from a fuel tank is in an allowable range based on a pressure in the fuel tank which is detected by a pressure sensor while a pump is driven to decrease a pressure in the fuel tank. The ECU opens a purge valve, whereby the fuel vapor adsorbed by a canister is introduce into an engine through an intake passage. The ECU controls the selector valve to connect a first pump passage and the second pump passage so as to circulate an atmospheric air in the pump while the purge valve is opened to introduce the fuel vapor into the internal combustion engine, whereby a foreign matter in the pump can be removed.

Fuel vapor treatment system

A valve timing control apparatus includes a temperature sensing member which expands at a main lock phase when a temperature of an engine is higher than or equal to a predetermined temperature so as to prohibit a main lock component from moving out of a main lock hole to a guide slot. The temperature sensing member shrinks at the main lock phase when the temperature of the engine is lower than the predetermined temperature so as to allow the main lock component to move out of the main lock hole toward the guide slot.

Valve timing control apparatus

A fuel vapor purge device includes a canister connected to an internal combustion engine and a fuel tank via a purge passage to adsorb and hold a part of fuel vapor, a switch valve connected to the canister and to an atmosphere, and a pump connected to the switch valve via a pump passage and to the atmosphere via an atmosphere passage. The pump is capable of depressurizing or pressurizing an interior of the fuel tank, and the switch valve switches connection of the canister between with the atmosphere and with the pump. The fuel vapor purge device further includes a seal valve provided in the pump passage to open or close the pump passage depending on a pressure in the atmosphere passage.

Fuel vapor purge device

An operation of a change valve is changeable between a valve closing state, in which the change valve is closed to close connection between a pump passage and a canister passage and to open connection between an atmosphere passage and the canister passage, and a valve opening state, in which the change valve is opened to open the connection between the pump passage and the canister passage and to close the connection between the atmosphere passage and the canister passage. An ECU determines that the change valve is abnormal when a value, which is obtained by subtracting a second reference pressure measured in an (n&#x2212;1)th execution of a fuel vapor leakage sensing process from a first reference pressure measured in an nth execution of the fuel vapor leakage sensing process, is equal to or larger than a predetermined threshold value.

Growing community of inventors

Nagoya, Japan

Kosei Takagi