Abstract: An evaporative fuel processing device for determining a leak of an evaporation piping system also determined pump abnormality by including a pump, a pressure sensor and an abnormality determiner, i.e., by pressuring/de-pressuring the system to a positive/negative value against an atmospheric pressure for leak determination, by detecting a pressure of the system, and by determining a leak hole in a normal leak determination mode based on an absolute value of the detected pressure reaching or not reaching a target value after pump operation and based on an assumption that the pump is normal. Specifically, after lapse of a determination time from a pump stop, the absolute value equal to or less than a normal leak determination threshold value is determined that a leak hole is present in the system. Further, the absolute value not reaching the target value even after pump operation triggers a pump abnormality determination mode.

Abstract: A bottom wall portion of a valve member has an annular convex portion projecting from a bottom surface toward a valve seat. A rubber seal member has a flat plate portion in contact with the bottom wall portion, and an annular lip portion formed to project toward the valve seat at a position corresponding to the convex portion in the flat plate portion so as to abut on the valve seat at the time of valve closing. A projecting tip of the lip portion forms an arc-shaped part in the axial cross section of the valve member. A projecting tip of the convex portion forms an arc-shaped part having a curvature radius larger than a curvature radius of the arc-shaped part of the lip portion in the axial cross section of the valve member.

Abstract: An evaporative fuel processing device for determining a leak of an evaporation piping system also determined pump abnormality by including a pump, a pressure sensor and an abnormality determiner, i.e., by pressuring/de-pressuring the system to a positive/negative value against an atmospheric pressure for leak determination, by detecting a pressure of the system, and by determining a leak hole in a normal leak determination mode based on an absolute value of the detected pressure reaching or not reaching a target value after pump operation and based on an assumption that the pump is normal. Specifically, after lapse of a determination time from a pump stop, the absolute value equal to or less than a normal leak determination threshold value is determined that a leak hole is present in the system. Further, the absolute value not reaching the target value even after pump operation triggers a pump abnormality determination mode.

Abstract: The present disclosure provides a fuel vapor processing system. The system includes a tank passage, a canister, a purge passage, an air passage, a purge valve, a controller, a fuel vapor processing portion, a pressure sensor, a fuel refill detecting portion, and an abnormality detecting portion. The fuel refill detecting portion detects that fuel refill to the fuel tank is started or fuel refill to the fuel tank is being performed by executing a fuel refill detecting process. An abnormality detecting portion detects, by executing an abnormality detecting process, a clogged situation where the tank passage is clogged based on a signal from the pressure sensor received after the fuel refill detecting portion detected that the fuel refill to the fuel tank was started.

Abstract: 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.

Abstract: A tank passage is connected at its one end to a fuel tank, which stores fuel. A canister is connected to the other end of the tank passage and adsorbs evaporated fuel generated by evaporation of fuel in the fuel tank. An electric control valve is operable with current supply to control an amount of fluid flowing through the tank passage by varying an open rate of the tank passage. A fill-up detection part detects that the fuel tank is filled up with fuel based on a fuel level in the fuel tank. A control part controls an operation of the electric control valve. The control part controls the electric control valve in the valve closing direction, which decreases the open rate, when the fill-up detection part detects that the fuel tank is filled up with fuel.

Abstract: A bottom wall portion of a valve member has an annular convex portion projecting from a bottom surface toward a valve seat. A rubber seal member has a flat plate portion in contact with the bottom wall portion, and an annular lip portion formed to project toward the valve seat at a position corresponding to the convex portion in the flat plate portion so as to abut on the valve seat at the time of valve closing. A projecting tip of the lip portion forms an arc-shaped part in the axial cross section of the valve member. A projecting tip of the convex portion forms an arc-shaped part having a curvature radius larger than a curvature radius of the arc-shaped part of the lip portion in the axial cross section of the valve member.

Abstract: A flow rate control valve includes a housing, a valve part, a driving part, a power transmission shaft and a sealing part. The valve part is provided in the housing. The driving part is placed outside the housing and configured to drive the valve part. The power transmission shaft penetrates the housing and connects the driving part to the valve part to enable power transmission. The sealing part seals a part through which the power transmission shaft penetrates and restrains a leakage of evaporated fuel from the housing. The sealing part includes a first sealing member and a second sealing member. The first sealing member is made of an organic material having a resistance against a fuel permeation, and the second sealing member is made of an organic material having a resistance against low temperature.

Abstract: 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.

Abstract: A tank passage is connected at its one end to a fuel tank, which stores fuel. A canister is connected to the other end of the tank passage and adsorbs evaporated fuel generated by evaporation of fuel in the fuel tank. An electric control valve is operable with current supply to control an amount of fluid flowing through the tank passage by varying an open rate of the tank passage. A fill-up detection part detects that the fuel tank is filled up with fuel based on a fuel level in the fuel tank. A control part controls an operation of the electric control valve. The control part controls the electric control valve in the valve closing direction, which decreases the open rate, when the fill-up detection part detects that the fuel tank is filled up with fuel.

Abstract: The present disclosure provides a fuel vapor processing system. The system includes a tank passage, a canister, a purge passage, an air passage, a purge valve, a controller, a fuel vapor processing portion, a pressure sensor, a fuel refill detecting portion, and an abnormality detecting portion. The fuel refill detecting portion detects that fuel refill to the fuel tank is started or fuel refill to the fuel tank is being performed by executing a fuel refill detecting process. An abnormality detecting portion detects, by executing an abnormality detecting process, a clogged situation where the tank passage is clogged based on a signal from the pressure sensor received after the fuel refill detecting portion detected that the fuel refill to the fuel tank was started.

Abstract: A two-stage changeover valve is provided in a vaporized fuel passage connected between a fuel tank and a canister. A valve member is movably accommodated in a fluid passage formed in a valve housing. A valve seat is formed at an inner peripheral wall of the valve housing, so that the valve member is operatively seated on the valve seat. A restricted communication hole is formed in the valve member, so that an upstream side and a downstream side of the valve member are communicated with each other, even when the valve member is seated on the valve seat. The restricted communication hole is formed in a Laval-nozzle shape, so that vaporized fuel passing through the restricted communication hole is accelerated. As a result, a process for depressurizing inner pressure of the vaporized fuel in the fuel tank can be carried out in a shorter time.

Abstract: A two-stage switch valve includes a valve body slidable in a flow passage of a fluid, and a spring urging the valve body upstream. The valve body includes a valve element slidable in the flow passage, an upstream guide having a ring shape and being slidable in the flow passage, and legs connecting the valve element and the upstream guide. The upstream guide is located upstream of the valve element. The legs are inclined from an axial direction of the upstream guide and extend from the upstream guide toward a center of the valve element.

Abstract: A tank sealing valve arranged in a passage network through which a fluid flows between a fuel tank and a canister includes a first valve unit and a second valve unit. A first port and a second port of three ports included in an outer case body of the first valve unit are open toward a first chamber of two chambers divided by a diaphragm or a bellows of the first valve unit, and a third port of the three ports is open toward a second chamber of the two chambers. A valve body of the first valve unit includes a through passage penetrating a valve portion and a column portion of the valve body. The valve portion communicates with the first port and the second chamber through the through passage in a case where the first port is closed. The second valve unit opens and closes the third port.

Abstract: A valve device includes a valve seat forming member, a case, a first O-ring, and a second O-ring. The valve seat forming member is fit into a passage defining and forms a valve seat. The case houses an electromagnetic solenoid and is connected to the passage defining member. The first O-ring is interposed between an inner circumferential surface of the passage defining member and an outer circumferential surface of the valve seat forming member. The first O-ring prohibits the fluid from flowing through a space between the passage defining member and the valve seat forming member when the main valve body seats on the valve seat. The second O-ring is interposed between the case and the passage defining member. The second O-ring prohibits the fluid from flowing from the passage to an outside of the passage defining member.

Abstract: A first valve chamber, which receives a valve assembly of a tank closing solenoid valve, and a second valve chamber, which receives a valve assembly of a pressure responsive valve, are formed between a first flow passage and a second flow passage of a first housing by fitting a second peripheral wall of a second housing into a radially inner side of a first peripheral wall of the first housing. Thereby, it is not required to heat-weld and bond between a connecting end surface of the first housing and a connecting end surface of the second housing.

Abstract: A tank sealing valve arranged in a passage network through which a fluid flows between a fuel tank and a canister includes a first valve unit and a second valve unit. A first port and a second port of three ports included in an outer case body of the first valve unit are open toward a first chamber of two chambers divided by a diaphragm or a bellows of the first valve unit, and a third port of the three ports is open toward a second chamber of the two chambers. A valve body of the first valve unit includes a through passage penetrating a valve portion and a column portion of the valve body. The valve portion communicates with the first port and the second chamber through the through passage in a case where the first port is closed. The second valve unit opens and closes the third port.

Abstract: An internal pressure sensor detects an internal pressure of the fuel tank, which stores fuel. A solenoid valve is configured to close to seal the fuel tank and is configured to open to open the fuel tank. An internal pressure acquisition unit is configured to acquire an internal pressure of the fuel tank from the internal pressure sensor. A drive control unit is configured to control the solenoid valve to open when the internal pressure of the fuel tank is greater than or equal to a first predetermined value, which is a negative value, and is less than a second predetermined value, which is 0 or a positive value.

Abstract: A valve device includes a valve seat forming member, a case, a first O-ring, and a second O-ring. The valve seat forming member is fit into a passage defining and forms a valve seat. The case houses an electromagnetic solenoid and is connected to the passage defining member. The first O-ring is interposed between an inner circumferential surface of the passage defining member and an outer circumferential surface of the valve seat forming member. The first O-ring prohibits the fluid from flowing through a space between the passage defining member and the valve seat forming member when the main valve body seats on the valve seat. The second O-ring is interposed between the case and the passage defining member. The second O-ring prohibits the fluid from flowing from the passage to an outside of the passage defining member.

Abstract: A two-stage electro-magnetic valve maintains a pressing force applied onto a switch valve body from a press member after a lifting of an open-close valve body from a valve seat by an introduction of a pressure of a valve chamber. In such manner, the switch valve body need not be put in a pressure receiving state when the switch valve body is completely closed. In other words, it is not necessary for a pressure receiving diameter of the switch valve body to be smaller than a pressure receiving diameter of the open-close valve body. Such configuration increases design freedom of the pressure receiving diameter for the open-close valve body because it separates the diameter of the valve body from a diameter restriction of the switching valve body, which allows both valve bodies to have the same diameter, which maximizes the effect of a pressure cancel mechanism.