Abstract: This exhaust purification system includes: a pump disposed in an exhaust-side purge passage to supply air or purge gas purged from a canister to a catalyst; a three-way valve disposed upstream of the pump in the exhaust-side purge passage and configured to switch the exhaust-side purge passage between a communicating state allowing the pump to communicate with the canister and an atmosphere open state allowing the pump to communicate with the atmosphere; a flow control valve disposed downstream of the pump and configured to control a flow rate of air to be supplied to the catalyst; and a controller configured to, when a request to regenerate the catalyst occurs, control a purge valve, the pump, the three-way valve, and the flow control valve to supply, to the catalyst, purge gas purged from the canister and air by a necessary amount to burn particulates trapped in the catalyst.

Abstract: In an internal combustion engine system, a controller is configured to: perform a purge control during execution of an A/F feedback learning; detect a purge concentration after execution of the A/F feedback learning; calculate an A/F feedback learning correction value adjusted by offsetting an A/F feedback learning value with a contributing value of the purge concentration; disable updating of the A/F feedback learning correction value after calculation of the A/F feedback learning correction value and until the purge control is stopped; and detect the purge concentration based on an air-fuel ratio deviation amount.

Abstract: A canister includes a vapor port leading to a fuel tank, an atmospheric port leading to the atmosphere, a first purge port leading to a first purge passage, and a second purge port leading to a second purge passage. The vapor port is located farther from the second purge port than the first purge port.

Abstract: A control unit for an air pump provided with a motor is provided to perform a energization switching control for unfreezing of switching energization and non-energization to a coil of the motor to unfreeze the air pump when the air pump is determined to be frozen, and to vary at least any one of an energization time and a non-energization time to the coil when the energization switching control for unfreezing is to be carried out.

Abstract: An evaporated fuel processing apparatus is provided with a canister to collect vapor, a purge passage to purge the vapor collected in the canister to an intake passage, a purge valve provided in the purge passage to regulate a purge flow rate of the vapor, a purge pump provided between the canister and the purge valve to pressure-feed the vapor from the canister to the purge passage, and a vapor pressure sensor to detect vapor pressure in the purge passage. An inside of the canister is communicated with the atmosphere, a capacity chamber (the canister) is provided upstream of the purge pump, and the vapor pressure sensor is provided in the purge passage between the purge valve and the purge pump.

Abstract: A pressure regulating valve includes a casing, a holder, a fixed valve, a movable valve, a spring member, a diaphragm, and a filter. The filter is configured to filter fluid flowing from a flow inlet of the casing into a pressure chamber. The filter includes a filtering part for filtering fluid and a holding part including a frame part for holding an outer periphery of the filtering part. An alignment structure configured to align the holding part at a predetermined position is provided between the holding part of the filter and the holder, or between the holding part of the filter and the casing.

Abstract: A centrifugal pump includes a pump and a motor. The pump includes an impeller configured to forcibly transfer a fluid and defines a pump chamber housing the impeller therein. The motor includes a hollow rotational shaft configured to rotate the impeller, and a casing defining a motor chamber that houses the rotational shaft therein. The rotational shaft forms a discharge passage therein and has a first end engaged with the impeller and a second end where a first end of the discharge passage opens. The first end of the discharge passage is in fluid communication with a low pressure area in the pump chamber via a second end of the discharge passage and is in fluid communication with a high pressure area in the pump chamber via an introduction passage formed in the casing.

Abstract: A centrifugal pump includes an impeller and a housing defining a pump chamber that houses the impeller therein. The housing includes an inlet passage in fluid communication with the pump chamber and an outside of the housing. The inlet passage includes a connection passage part having a cylindrical shape extending from the pump chamber and a main passage part having a cylindrical shape connected to the connection passage part, so as to form a bent shape. A central axis of the main passage part is parallel to a reference plane that includes a central axis of the connection passage part. A flow direction of a fluid parallel the central axis of the main passage part is partly the same as the rotational direction of the impeller in a plan view along an axis of the impeller.

Abstract: A centrifugal pump includes a housing and an impeller housed in the housing. The impeller has a main plate, a plurality of first blades, and a plurality of second blades. The first blades and the second blades extend radially along the main plate and have the same radial length. Each of the second blades has a low blade part and a high blade part extending radially from a radially outer end of the low blade part. When comparing the first blades and the second blades with each other at an equal distance from a rotational axis of the impeller, a height of the low blade part measured from the main plate is less than a height of each first blade measured from the main plate, and a height of the high blade part measured from the main plate is the same as that the height of each first blade.

Abstract: A welding structure includes, in a cross-section of the first member and the second member when they are seen from an axial direction of the insertion hole, a plurality of welding spots, an outer periphery of the welding spots are each formed with a curve-shaped portion and two side-face portions. When two intersections where the outer side-face portion on the outer periphery of the both-end welding spots and the outer periphery of the second member intersect are defined as a first intersection and a second intersection, a weld angle formed by a first linear line linking the first intersection with a sectional center of the second member and a second linear line linking the second intersection with the sectional center of the second member is set to a first predetermined angle or more.

Abstract: A fuel vapor processing apparatus form an internal combustion engine provided with a turbocharger includes a canister and an ejector. The canister is configured to adsorb fuel vapor from a fuel tank. The ejector is configured to generate a negative pressure by supercharged air flowing from an intake passage on a downstream side of the turbocharger to the intake passage on an upstream side of the turbocharger, so that fuel vapor in the canister is purged by the negative pressure. The ejector includes an ejector housing extending in a discharge direction of the supercharged air. The ejector housing is welded to a tubular member defining a passage wall of the intake passage such that the supercharged air is discharged into the intake passage on the upstream side of the turbocharger and that the discharge direction of the supercharged air is parallel to a direction of flow of intake air.

Abstract: A detecting unit that detects a specific pressure difference between a pressure of gas that has passed throuch a canister and a pump and a pressure of the gas before passing through the canister and the pump. A gas flow rate from the pump may be higher with a smaller pressure difference between upstream and downstream sides relative to the pump, and higher with a higher purge gas density. A gas flow rate from the canister may be lower with a smaller pressure difference between upstream and downstream sides relative to the canister, and lower with a higher purge gas density. An estimating unit may estimate a flow rate of the purge gas while the specific pressure difference is an unchanged pressure difference being a pressure at which the flow rate of the gas is not chanced by the density of the purge gas.

Abstract: A centrifugal pump includes an impeller rotated about a rotational axis in a rotational direction by a motor and a housing defining a pump chamber therein. The impeller is housed in the pump chamber. The impeller includes a main plate having substantially circular shape and a first surface extending perpendicular to the rotational axis. The main plate is provided with a plurality of blades projecting axially from the first surface and extending radially along the first surface. Each of the blades has a radially inner blade part and a radially outer blade part extending radially outward from the radially inner blade part. Each of the outer blade parts has a front surface that extends from the main plate obliquely either frontward or rearward relative to the rotational direction.

Abstract: A refueling control system for an internal combustion engine includes a fuel tank; a vapor pipe; a step motor-driven shut-off valve; a fuel filler lid; and an electronic control unit configured to, when the fuel filler lid is to be opened, i) drive the shut-off valve such that the shut-off valve is opened, ii) close the fuel filler lid when an opening degree of the shut-off valve is less than a set opening degree, and iii) open the fuel filler lid when the opening degree of the shut-off valve is greater than or equal to the set opening degree. The electronic control unit sets the set opening degree such that the set opening degree when an opening speed of the shut-off valve is low is greater than the set opening degree when the opening speed of the shut-off valve is high.

Abstract: An exhaust leak detecting apparatus includes an exhaust pressure sensor to detect the exhaust pressure in a portion of an exhaust passage that allows exhaust gas discharged from an engine to flow therethrough, the portion being located at a position upstream of a catalyst for purifying exhaust gas, and an exhaust leak determining part to determine that exhaust gas is leaking or may leak from the exhaust passage upstream of the catalyst and generate a warning when the exhaust pressure detected by the exhaust pressure sensor falls outside a predetermined range.

Abstract: A fuel supply device includes a sub-tank, a fuel pump, a transfer jet pump, a reduction valve, and a partition wall. The sub-tank is disposed within the fuel tank and forms a container configured to store fuel. The fuel pump is disposed in the sub-tank and is configured to pump fuel from the sub-tank. The transfer jet pump is configured to pump fuel from the fuel tank into the sub-tank. The reduction valve generates heat during operation. The partition wall divides an interior of the sub-tank into a first chamber and a second chamber. The fuel pump is disposed in the first chamber. Fuel passing through the reduction valve is discharged into the second chamber.

Abstract: A fuel vapor processing apparatus includes an adsorption passage has a first end connected to a fuel tank and a second end open to the atmosphere. The adsorption passage includes a first hollow chamber, a second hollow chamber, and a third hollow chamber. In addition, the adsorption passage includes a first adsorption chamber and a second adsorption chamber. The first adsorption chamber is positioned between the first hollow chamber and the second hollow chamber, and the second adsorption chamber is positioned between the second hollow chamber and the third hollow chamber. The adsorption chambers are configured to adsorb and desorb fuel vapor. A purge passage extends from the second hollow chamber toward an internal combustion engine. A bypass passage extends from the first hollow chamber to the third hollow chamber and bypasses the second hollow chamber. The bypass passage is provided with a shutoff valve that is open during a purge operation and is closed at other times.

Abstract: An evaporated fuel treatment apparatus is provided to determine pipe abnormalities (clogging or leakage) without discharging evaporated fuel to the atmosphere. The evaporated fuel processing apparatus includes an abnormality determination section for determining an abnormality of a vapor passage or a purge passage, drives a purge pump while an engine is operating, opens a purge control valve, sets the purge passage (upstream passage) and the vapor passage on the upstream side of the purge control valve to be under a negative pressure, and determines an abnormality of the vapor passage or the purge passage based on a pressure detected by a pressure sensor.

Abstract: An evaporated fuel processing device may include a canister retaining evaporated fuel in a fuel tank, a vent passage communicating the canister and an intake passage of an engine, a first pump that discharges mixed gas of air and the evaporated fuel to the intake passage via the vent passage, a detector that detects a first pressure value indicating a pressure of the mixed gas discharged by the first pump, a memory storing pressure value-concentration correlated data indicating mixed gas, an acquisition unit that acquires a third pressure value indicating an air pressure detected by the detector in a case where the air containing substantially no evaporated fuel is discharged by the first pump, and an estimation unit that estimates a concentration of the evaporated fuel contained in the mixed gas discharged by the first pump by using the first and third pressure values and the pressure value-concentration correlated data.

Abstract: A vaporized fuel treatment device includes a sealing valve disposed in a vapor passage between a fuel tank and a canister and is configured to include a valve element moves forward and backward in an axial direction to a valve seat, a cut-off valve configured to cut off a communication between the canister and an atmosphere, a tank internal pressure sensor detects an internal pressure of the fuel tank, and a canister internal pressure sensor that detects an internal pressure of the canister, a controller programmed to change an axial distance between the valve element and the valve seat in a state where the cut-off valve cuts off the communication between the canister and the atmosphere and to learn a valve opening start position of the sealing valve based on changes in the internal pressures of the fuel tank and the canister depending on a change in the axial distance.