Abstract: A tank passage has one end connected to a fuel tank. A purge passage has one end connected to a canister and the other end connected to an intake passage. An atmospheric passage has one end connected to the canister and the other end communicated with the atmosphere. A purge valve opens and closes the purge passage. An atmospheric valve opens and closes an atmospheric passage. A tank switch valve opens and closes the tank passage. A pressure sensor detects pressure in the purge passage and outputs a signal corresponding to the detected pressure. An abnormality detection portion executes an abnormality detection processing that detects a clog abnormality based on a signal from a pressure sensor when the tank switch valve is activated in a state in which the purge valve and the atmospheric valve are closed, after driving of an engine is stopped.

Abstract: A tank passage has one end connected to a fuel tank. A purge passage has one end connected to a canister and the other end connected to an intake passage. An atmospheric passage has one end connected to the canister and the other end communicated with the atmosphere. A purge valve opens and closes the purge passage. An atmospheric valve opens and closes an atmospheric passage. A tank switch valve opens and closes the tank passage. A pressure sensor detects pressure in the purge passage and outputs a signal corresponding to the detected pressure. An abnormality detection portion executes an abnormality detection processing that detects a clog abnormality based on a signal from a pressure sensor when the tank switch valve is activated in a state in which the purge valve and the atmospheric valve are closed, after driving of an engine is stopped.

Abstract: An evaporative fuel processing apparatus executes a purge process when a predetermined purge condition is satisfied. A precondition, which is satisfied immediately before the satisfaction of the purge condition, is set. An operation of a purge pump is started at the time of satisfying the precondition. Thereafter, when the purge condition is satisfied, the purge valve is opened to execute the purge process. In this way, the time required for the purge pump to reach a rated rotational speed upon satisfaction of the purge condition can be shortened. Thus, the operating time period of the purge pump can be shortened, and the response delay of the purge can be avoided. That is, it is possible to limit shortage of the purge amount caused by the response delay.

Abstract: In an evaporation fuel processing apparatus, a canister holds an evaporation fuel evaporated in a fuel tank, a purge passage communicates with the canister and an intake passage of an engine, a purge pump disposed in the purge passage pressurizes and feeds an air in the canister toward the intake passage, a bypass passage disposed in the purge passage bypasses the purge pump, and an on-off valve disposed in the purge passage opens and closes the bypass passage. When an intake negative pressure of the intake passage is low, the purge pump is activated, and the bypass passage is closed by the on-off valve. When the intake negative pressure of the intake passage is not low, the purge pump is stopped, and the bypass passage is open by the on-off valve.

Abstract: An evaporative fuel processing apparatus executes a purge process when a predetermined purge condition is satisfied. A precondition, which is satisfied immediately before the satisfaction of the purge condition, is set. An operation of a purge pump is started at the time of satisfying the precondition. Thereafter, when the purge condition is satisfied, the purge valve is opened to execute the purge process. In this way, the time required for the purge pump to reach a rated rotational speed upon satisfaction of the purge condition can be shortened. Thus, the operating time period of the purge pump can be shortened, and the response delay of the purge can be avoided. That is, it is possible to limit shortage of the purge amount caused by the response delay.

Abstract: In an evaporation fuel processing apparatus, a canister holds an evaporation fuel evaporated in a fuel tank, a purge passage communicates with the canister and an intake passage of an engine, a purge pump disposed in the purge passage pressurizes and feeds an air in the canister toward the intake passage, a bypass passage disposed in the purge passage bypasses the purge pump, and an on-off valve disposed in the purge passage opens and closes the bypass passage. When an intake negative pressure of the intake passage is low, the purge pump is activated, and the bypass passage is closed by the on-off valve. When the intake negative pressure of the intake passage is not low, the purge pump is stopped, and the bypass passage is open by the on-off valve.

Abstract: A canister absorbs evaporated fuel produced in a fuel tank and supplies the absorbed evaporated fuel to an engine. A sealing valve is equipped between the fuel tank and the canister. A detection unit detects a state of a lid of the fuel tank. An intention estimation unit estimates existence of a refueling intention according to an activity of a user. A release time period estimation unit estimates a release time period, which is needed to release a pressure in the fuel tank, according to a state of a vehicle. A manipulation control unit opens the sealing valve when the lid is opened. The manipulation control unit opens the sealing valve, even in a case where the lid is closed, on estimation that the refueling intention exists, and on determination that the estimated release time period is greater than a predetermined time period.

Abstract: A fuel storage device includes a fuel tank that stores liquid fuel which is fed through a fill opening of a vehicle. The fuel tank includes a tank case and a separating film. The tank case has a projecting shape in section and defines a two-tiered upper-lower fuel storage chamber in a state where the fuel tank is disposed in the vehicle. The separating film is deformable in the tank case and has impermeability against liquid fuel in the fuel storage chamber. The fuel storage chamber includes a primary fuel storage chamber and a secondary fuel storage chamber. The primary chamber is surrounded partly with the separating film and communicates with the fill opening. The secondary chamber projects toward an upper side of the primary chamber in the state where the fuel tank is disposed in the vehicle and communicates with the fill opening only via the primary chamber.

Abstract: A canister absorbs evaporated fuel produced in a fuel tank and supplies the absorbed evaporated fuel to an engine. A sealing valve is equipped between the fuel tank and the canister. A detection unit detects a state of a lid of the fuel tank. An intention estimation unit estimates existence of a refueling intention according to an activity of a user. A release time period estimation unit estimates a release time period, which is needed to release a pressure in the fuel tank, according to a state of a vehicle. A manipulation control unit opens the sealing valve when the lid is opened. The manipulation control unit opens the sealing valve, even in a case where the lid is closed, on estimation that the refueling intention exists, and on determination that the estimated release time period is greater than a predetermined time period.

Abstract: A control part conducts a pulse width modulation control for a first valve and a second valve in a manner that a sum of a first flow rate of fluid flowing through a first passage and a second flow rate of fluid flowing through a second passage agrees with a target flow rate. When the target flow rate is less than a sum of the maximum of the first flow rate and the maximum of the second flow rate, the control part controls a control timing of a first signal driving the first valve and a control timing of a second signal driving the second valve to be different from each other.

Abstract: A fuel vapor treatment apparatus includes a fuel tank, a canister, a passage forming member, a pressure-regulating valve, an acceleration detector, and a controller. The fuel tank is for a storage of fuel to be supplied to an internal combustion engine for a vehicle. The canister recovers fuel evaporated from the fuel tank. The passage forming member defines a passage through which the fuel tank and the canister communicate with each other. The pressure-regulating valve is provided in the passage forming member to connect or disconnect the fuel tank and the canister. The acceleration detector detects an acceleration value of the vehicle, and the controller controls the pressure-regulating valve based on the acceleration value detected by the acceleration detector.

Abstract: A fuel vapor treatment apparatus includes a fuel tank, a canister, a passage forming member, a pressure-regulating valve, an acceleration detector, and a controller. The fuel tank is for a storage of fuel to be supplied to an internal combustion engine for a vehicle. The canister recovers fuel evaporated from the fuel tank. The passage forming member defines a passage through which the fuel tank and the canister communicate with each other. The pressure-regulating valve is provided in the passage forming member to connect or disconnect the fuel tank and the canister. The acceleration detector detects an acceleration value of the vehicle, and the controller controls the pressure-regulating valve based on the acceleration value detected by the acceleration detector.

Abstract: A filter apparatus includes a tubular member that has an internal space. The filter apparatus further includes a filter that is accommodated in the internal space of the tubular member when the filter is bent around a straight imaginary line. The filter is adapted to filtering fluid flowing through the internal space of the tubular member. The filter has a cross section, which is perpendicular to the straight imaginary line, being in a substantially curvature protruding to an upstream with respect to a flow direction of the fluid when the filter is bent around the straight imaginary line. The filter has a first side and a second side that are opposite to each other with respect to the straight imaginary line. The tubular member has a first engage portion and a second engage portion. The first engage portion is adapted to engaging with the first side of the filter. The second engage portion is adapted to engaging with the second side of the filter.