A purge system for fuel evaporation gas may include an ejector, having a nozzle configured to allow driving fluid to pass therethrough, a driving inlet through which the driving fluid is supplied into the ejector, a suction inlet through which purge gas including a fuel component is drawn as suction fluid from a canister into the ejector, a diffuser outlet through which a mixture of the driving fluid that has passed through the nozzle and the drawn purge gas is discharged out of the ejector, and a suction passage extending from the suction inlet toward a downstream side of the nozzle based on a flow direction of the driving fluid, and a bypass passage coupled from the suction inlet to the driving inlet.

Methods and systems are provided for determining an extent of clogging of a canister filter included in a fuel vapor storage canister of a vehicle. In one example, a method comprises determining an extent to which the canister filter is clogged based on an output of an exhaust gas sensor, and adjusting one or more parameters related to purging of the fuel vapor storage canister as a function of the extent to which the canister filter is clogged. In this way, canister lifetime may be improved, and release of undesired evaporative emissions to atmosphere may be reduced or avoided.

A canister structure for a saddle riding vehicle, including a canister connected with a fuel tank using a connection line, the canister adsorbing fuel vapor generated in the fuel tank, and a purge valve disposed in a path through which the fuel vapor is returned from the canister to an air intake system of an engine, includes an annular canister rubber that fits over an outer cylinder of the canister; a canister stay disposed on a vehicle body side; and an engagement portion disposed on the purge valve. In the canister structure, the canister rubber has, formed on an outer periphery thereof, an anterior-side mounting portion and a posterior-side mounting portion each having an insertion hole in which the canister stay is inserted and a purge valve mounting portion having an engagement portion insertion hole in which the engagement portion of the purge valve is inserted.

Methods and systems are provided for cleaning one or more valve(s) that regulate an amount of fuel vapor routed to an engine of a vehicle in response to an indication that the one or more valve(s) are exhibiting degraded sealing properties. In one example, a method includes timing opening and closing events of the valve to coincide with higher than a threshold pressure differences across the valve as compared to lower than the threshold pressure differences in terms of pressure oscillations across the valve, the pressure oscillations stemming from an intake of the engine. In this way, the one or more valve(s) may be controlled to open under higher loads and stresses on the valve(s), which may dislodge debris, carbon buildup, etc., thus serving to clean the valve.

A canister that is mounted on a vehicle includes an inflow port, an outflow port, an atmosphere port, a valve, at least one honeycomb body, and a spacer. The inflow port is coupled to a fuel tank in the vehicle. The outflow port is coupled to an intake flow passage of an internal combustion engine in the vehicle. The atmosphere port communicates an interior of the canister with an exterior of the canister. The valve opens and closes the atmosphere port. The honeycomb body is arranged in the most downstream side in a gas flow passage that leads to the atmosphere port from the inflow port, which is the upstream of the valve, enables adsorption and desorption of an evaporated fuel evaporated from the fuel tank, and has a honeycomb configuration. The spacer is arranged between the valve and the honeycomb body and maintains a specific distance therebetween.

Disclosed is a method for monitoring pressure, for a vessel assembly including a sealed vessel capable of holding a liquid, a filter capable of capturing vapors from the liquid, a pipe connecting the vessel to the filter, and an isolation valve arranged to selectively shut off the pipe, including a detection of the boiling of the liquid contained in the vessel.

Disclosed is a method for controlling the pressure inside a fuel tank of a motor vehicle, the motor vehicle including a fuel vapor vent circuit connecting the tank to a fuel vapor canister, the vent circuit including an isolation valve for isolating the tank and a rollover valve. The pressure control method includes steps of: determining an activation duration required for the isolation valve to transition from a closed state to a fully open state, referred to as the full opening duration, when a predefined rollover valve closure risk criterion is satisfied: controlling the isolation valve in repeated activations of respective durations that are shorter than the full opening duration.

An intake system may include a purge supply device; an exhaust gas recirculation device; and a pressure adjustor. The purge supply device may include a purge path connected to an intake path of an engine mounted on a vehicle, and be configured to supply evaporative fuel from a fuel tank to the intake path through the purge path. The exhaust gas recirculation device may include a circulation path connected to the intake path between a throttle valve and a first connecting position connecting the intake path and the purge path, and be configured to supply to the intake path a part of exhaust gas of the engine through the circulation path. The pressure adjustor may be disposed between the first connecting position and a second connecting position connecting the intake path and the circulation path, and be configured to adjust a pressure at the second connecting position.

An abnormality detection device of an internal combustion engine includes an ECU that is an abnormality detection unit detecting a leakage occurrence of a second pure pipe. When the internal combustion engine is in a supercharging operation state that a supercharger operates and the second purge pipe is closed by a second purge valve, the ECU detects the leakage occurrence of the second purge pipe based on a differential pressure between a pressure in the second purge pipe and an atmospheric pressure. In this case, the valve pressure in the second purge pipe is a pressure in the second purge pipe between the second purge valve and the intake pipe.

A canister that is mounted on a vehicle includes an inflow port, an outflow port, an atmosphere port, a valve, at least one honeycomb body, and a spacer. The inflow port is coupled to a fuel tank in the vehicle. The outflow port is coupled to an intake flow passage of an internal combustion engine in the vehicle. The atmosphere port communicates an interior of the canister with an exterior of the canister. The valve opens and closes the atmosphere port. The honeycomb body is arranged in the most downstream side in a gas flow passage that leads to the atmosphere port from the inflow port, which is the upstream of the valve, enables adsorption and desorption of an evaporated fuel evaporated from the fuel tank, and has a honeycomb configuration. The spacer is arranged between the valve and the honeycomb body and maintains a specific distance therebetween.