Denso Corporation

Denso Corpora Tion

Tomohiro Itoh

Shigeru Hasegawa

Kosei Takagi

Keiichirou Ishihara

Yasuo Katoh

Ryoyu Kishi

Ryoyuu Kishi

Yasuo Kato

Mitsuyuki Kobayashi

Shinji Sugihara

Taiki Yasuzaka

Makoto Kaneko

Yoshiyuki Kono

Takamitsu Kubota

Yuichiro Miura

Takayuki Nagai

Masahiro Satou

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 vane pump includes a casing, a rotor, vanes, a motor, and a fixed member. The casing defines a pump chamber therein. The rotor is disposed in the casing and configured to eccentrically rotate relative to the casing. The vanes are configured to rotate together with the rotor to slidably move on an inner surface of the casing. The motor is configured to rotate the rotor. Both the motor and the casing are fixed to the fixed member. The casing has an outer side wall surface and a flange. The flange protrudes outward from the outer side wall surface at an intermediate position between both ends of the pump chamber in a rotational axis direction of the rotor. The flange is fixed to the fixed member at a plurality of positions. The fixed member has a linear expansion coefficient that is different from that of the casing.

Vane pump

A leak hole determination device in an evaporated fuel processing system. The leak hole determination device includes: a first pressure detector for detecting a first pressure in a fuel tank; a second pressure detector for detecting a second pressure in a canister; and a leak hole determiner for determining whether a leak hole is present. The leak hole determiner determines, after a limit pressure timing subsequent to a depressurization operation for depressurizing an inside of the system, whether a leak hole is present by using a difference between a change speed of a first pressure detected by the first pressure detector and a change speed of a second pressure detected by the second pressure detector.

Leak hole determination device of evaporated fuel processing device

A pressure sensor for an evaporated fuel leak detector includes a sensor unit, a case, and a sealing resin. The sensor unit has a pressure receiving portion, a plurality of conduction terminals, and a mold resin portion. The case has a fluid flow path and a housing recess. Each remaining inner wall surface of the housing recess except for an inner wall surface on the conduction terminal side is provided with an inclined surface and a vertical surface, in a cross section along an axial direction perpendicular to a pressure receiving surface of the sensor unit. The inclined surface is inclined inward as toward a pressure receiving side. The vertical surface extends from the end of the inclined surface on the pressure receiving side to define a filling gap in which the sealing resin is filled between the side surface of the mold resin portion and the vertical surface.

Pressure sensor for evaporated fuel leak detector

A pressure sensor for an evaporated fuel leak detector is used for checking a leak in a fuel tank and a canister. The pressure sensor includes a sensor unit, a case, and a sealing resin. The sensor unit includes a pressure receiving portion for detecting a pressure of a fluid applied to a pressure receiving surface, and a mold resin portion covering a surface of the pressure receiving portion except for the pressure receiving surface. The case has a fluid flow path for introducing the fluid to the pressure receiving surface, and a housing recess in which the sensor unit is accommodated. The sealing resin is arranged in the housing recess, to at least cover a back surface of the mold resin portion located on an opposite side of the pressure receiving surface.

A pressure sensor for an evaporated fuel leak detector is used for checking airtightness in a fuel tank and a canister. The pressure sensor includes a sensor unit, a case, and a sealing resin. The sensor unit has a pressure receiving portion, a plurality of conduction terminals, and a mold resin portion. The case has a fluid flow path and a housing recess. A buffer recess having an outer shape larger than the outer shape of a pressure receiving surface is formed at a pressure receiving side Lof the bottom of the housing recess. Further, a protruding cylinder portion protruding into the buffer recess toward a back side Lis formed at an outer edge of an opening end portion of the fluid flow path on the back side L

A pressure sensor for an evaporated fuel leak detector is used for checking a leak in a fuel tank and a canister. The pressure sensor includes a sensor unit, a case, and a sealing resin. The sensor unit has a pressure receiving portion, a plurality of conduction terminals, and a mold resin portion. The case is provided with a fluid flow path and a housing recess. The case has an annular inner wall surface that defines the housing recess and surrounds a side surface of the mold resin portion. The inner wall surface of the case is provided with a stepped surface that is parallel to the pressure receiving surface or is inclined by an internal angle of less than 90&#xb0; with respect to the pressure receiving surface, in a cross section along a direction perpendicular to the pressure receiving surface.

A vane pump includes: a casing forming a pump chamber therein; a rotor arranged inside the casing to rotate eccentrically with respect to the casing; and a plurality of vanes configured to rotate with the rotor and slide on an inner side surface of the casing. At least one of Formula (1): l&#x2264;(b/a)&#xd7;k and Formula (2): l&#x2264;(c/a)&#xd7;j is satisfied, where 'a' represents a height of the pump chamber, 'b' represents a height of the rotor, &#x201c;c&#x201d; represents a height of the vane in a rotation axis direction of the rotor, and where &#x201c;l&#x201d; represents a linear expansion coefficient of the casing in the rotation axis direction, &#x201c;k&#x201d; represents a linear expansion coefficient of the rotor in the rotation axis direction, and &#x201c;j&#x201d; represents a linear expansion coefficient of the vane in the rotation axis direction.

The evaporative fuel processing system includes a fuel tank, a canister, a pump, a pressure detection unit, a temperature detection unit, and a leak diagnosis unit a leak diagnosis unit configured to diagnose leak in the diagnostic object based on a first pressure change which is a change in pressure detected by the pressure detection unit when the temperature in the diagnostic object changes, a second pressure change which is a change in pressure detected by the pressure detection unit when the inside of the diagnostic object is pressurized or depressurized by the pump, a detected temperature by the temperature detection unit, a first preparation information and a second preparation information.

Evaporative fuel processing system

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

A fuel vapor processing device includes a canister, a first purge pipe that forms a first purge path that communicatively connects the inside of the canister and the inside of a fuel tank, a pressure pipe that forms a pressure detection path configured to communicatively connect a first switching valve and a pump, the first switching valve, a sealing valve disposed in the first purge pipe and configured to isolate the inside of the canister from the inside of the fuel tank, a differential pressure sensor, and an ECU. The differential pressure sensor is capable of detecting a difference between a pressure of the first purge path and a pressure of the pressure detection path. The ECU determines presence or absence of a fuel vapor leak while controlling the first switching valve, the pump, and the sealing valve based on a signal output from the differential pressure sensor.

Fuel vapor processing device

A fuel vapor processing device includes a three-way valve having a common valve chamber in which a first valve body, a second valve body, and a third valve body are housed. A single pressure sensor is provided in the common valve chamber. The first valve body enables communication between the common valve chamber and a first valve chamber. The second valve body enables communication between the common valve chamber and a second valve chamber communicating with an inside of the canister. The third valve body enables communication between the common valve chamber and a third valve chamber communicating with an inside of a fuel tank. An ECU controls the three-way valve and a switching valve, and controls driving of a pump to perform fuel vapor leak diagnosis for the fuel tank and the canister, based on a detection value detected by the pressure sensor.

An on-vehicle image processing device is provided. The on-vehicle image processing unit includes a signal conversion circuit arranged to convert an image signal acquired from an imaging unit into image data of a predetermined standard responding to an external command, and a control circuit arranged to acquire the image data, display an image of the imaging unit on a display unit through starting multiple modules in order, and perform data processing to the image. Upon a user performing a reversing operation, the control circuit starts a first module to display the image data acquired from the signal conversion circuit on the display unit as it is, and subsequently starts a second module to perform predetermined data processing to the image data.

On-vehicle image 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

A pressure sensor is provided in a purge pipe connecting a fuel tank to a canister, so that the pressure sensor outputs an electrical signal of a first sensor value depending on an inside pressure of the canister. A control unit calculates an estimated sealed pressure, which corresponds to the inside pressure of the canister in a condition that the canister and the fuel tank are in a sealed condition. The control unit determines that there is no leakage of fuel vapor, when the first sensor value is out of a first pressure range. The control unit determines that there is a small leakage of the fuel vapor, when the first sensor value is within the first pressure range but out of a second pressure range, wherein the second pressure range is smaller than the first pressure range. The control unit determines that there is a large leakage or a blocked-up condition in the purge pipe when the first sensor value is within the second pressure range.

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Kariya, Japan

Tomohiro Itoh