An onboard refueling vapor recovery (ORVR) system includes a main canister, a spare canister, a hydrocarbon sensor, a grade rollover valve (GRV), a fill limit vent valve (FLVV) and a fuel vapor pipe. The GRV and the FLVV are disposed at top portion of the fuel tank, with sides of the GRV and the FLVV hermetically connected with the fuel tank and a gas inlet end of the fuel vapor pipe. The main canister and the spare canister hermetically connect with a gas outlet end of the fuel vapor pipe. The main canister communicates with an intake manifold. The hydrocarbon sensor is disposed in the main canister and electrically connected with a vehicle control unit. The hydrocarbon sensor detects hydrocarbon concentration in the main canister and transmits the detection result to the vehicle control unit. The present invention also provides an automobile having the ORVR system.

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.

An evaporative fuel treatment device includes a canister configured to adsorb fuel vapor arising in a fuel tank of an internal combustion engine. A vent passage is connected to a system to be diagnosed, which includes the canister, and opens to atmosphere. A pump is connected to the vent passage and decreases and increases pressure in the system. A switching valve is provided to the vent passage and switches a communication state between the vent passage and the system. At least a part of a rotational portion of the pump, a contact portion of the pump, and the vent passage is formed of a carbon-containing material. The contact portion is in contact with the rotational portion. The carbon-containing material is mainly composed of carbon.

A purge valve for an EVAP system has a chamber including an inlet conduit for receiving fuel vapors from an EVAP canister, a first outlet conduit to the engine for the fuel vapors, and a second outlet conduit to the engine for the fuel vapors. Energizing the purge valve at a first current actuates a first armature from a closed position to an open position to open a first opening and allow fuel vapors to flow through the first outlet conduit to the engine, without actuating the second armature from a closed position. Energizing the purge valve at a second current that is greater than the first current actuates a second armature from a closed position to an open position to open the second opening and allow fuel vapors to flow through the second outlet conduit to the engine while maintaining the first armature in the fully open position.

A valve device has a valve housing, a valve member, a guide member and a valve control unit. A center axis of a vapor outlet pipe is defined as a passage axis of a vapor outlet passage. A cross section of the vapor outlet pipe on a plane perpendicular to an axial direction of the vapor outlet pipe is defined as an outlet-pipe cross section. An area of the outlet-pipe cross section is defined as an outlet passage area. An overlapping area, in which the outlet-pipe cross section overlaps with an outlet-nearest wall portion, is formed when viewed them in the axial direction of the vapor outlet pipe and when the outlet-pipe cross section is projected on the outlet-nearest wall portion. The valve housing and the guide member are so formed that the overlapping area is smaller than a half of the outlet passage area.

A purge valve for an EVAP system has a chamber including an inlet conduit for receiving fuel vapors from an EVAP canister, a first outlet conduit to the engine for the fuel vapors, and a second outlet conduit to the engine for the fuel vapors. Energizing the purge valve at a first current actuates a first armature from a closed position to an open position to open a first opening and allow fuel vapors to flow through the first outlet conduit to the engine, without actuating the second armature from a closed position. Energizing the purge valve at a second current that is greater than the first current actuates a second armature from a closed position to an open position to open the second opening and allow fuel vapors to flow through the second outlet conduit to the engine while maintaining the first armature in the fully open position.

By providing a mountain-shaped mountain portion (5a) protruded from a surface of a plunger (5) facing a valve seat to the inside of a rubber member (8), a dimensional change amount of a valve seat abutting portion (8a) in an opening and closing direction decreases, and thus it is possible to suppress change in characteristic. Also, it is possible to secure a rubber deformation amount sufficient for absorbing impact when the valve seat abutting portion (8a) collides with the valve seat, thereby suppressing an operation sound.

The disclosed embodiments relate to a device for operating a tank ventilation system of an internal combustion engine. This device has a fuel tank, an activated carbon filter for collecting and buffering fuel vapors escaping from the fuel tank, a purge air pump and a control unit. The outlet of the purge air pump is connected to the intake tract of the internal combustion engine via a first tank venting valve and connected to the exhaust tract of the internal combustion engine via a second tank venting valve.

Methods and systems are provided for controlling a duty cycle of a purge valve configured to regulate a purge flow from a fuel vapor storage canister to an intake of an engine during canister purging events. In one example, a method includes controlling a duty cycle of a purge valve configured to regulate a purge flow from a fuel vapor storage canister to an intake of an engine during a canister purging event based on a degradation factor obtained by comparison of durations at which a predetermined pressure is reached in an evaporative emissions system at multiple purge valve activation levels. In this way, a flow map stored at a controller may be updated for controlling the purge valve during subsequent purging events.

A controller for an internal combustion engine includes processing circuitry that performs a dither control process on condition that a temperature increase request of a catalyst is made. The processing circuitry operates fuel injection valves so that during the dither control process, one or more cylinders are lean combustion cylinders in a first period and another one or more cylinders are rich combustion cylinders and so that the average value of an exhaust gas-fuel ratio is a target air-fuel ratio in a second period including the first period. The dither control process is restricted in a manner that, on condition that the rich process is performed, the degree of richening of the richest exhaust gas-fuel ratio of exhaust gas-fuel ratios in the cylinders is reduced.