A flare gas recovery system includes a primary gas sweetening unit; and a liquid-driven ejector in continuous fluid communication with the primary gas sweetening unit. The ejector includes an inlet configured to receive a motive fluid including a regenerable amine solvent in a rich state from the primary gas sweetening unit; a gas inlet configured to receive a suction fluid including a gas; and a fluid outlet configured to either directly or indirectly discharge to the primary gas sweetening unit a two-phase fluid including a mixture of the suction fluid and the amine solvent in a rich state.

A controller controls a vehicle including an engine with a fuel vapor processing device. The fuel vapor processing device executes purge control that sends fuel vapor of a fuel tank, via a canister, to an intake passage on condition that air-fuel ratio learning is complete. The controller includes processing circuitry. The processing circuitry automatically stops the engine when an automatic stopping condition is satisfied, automatically starts the engine when an automatic starting condition is satisfied, determines that a prohibition condition for prohibiting automatic stopping is satisfied when the air-fuel ratio learning is incomplete, and inhibits automatic stopping of the engine even if the automatic stopping condition is satisfied when determining that the prohibition condition is satisfied.

A vehicle includes an engine, at least three wheels including a front wheel and a rear wheel, a fuel tank above the engine, a seat rearward of the fuel tank, a canister positioned lower than the fuel tank, and a vent hose to supply air therethrough into the canister to desorb the adsorbed fuel evaporative emission from the canister. An upstream end of the drain hose is connected to the vent hose. A downstream end of the drain hose is positioned lower than the canister.

An evaporated fuel treatment apparatus includes a canister, a purge passage, a purge pump, a purge valve, and a controller for executing purge control. The controller is configured to switch the purge valve to a closed state or an open state once, subsequently set a concentration sensing flag to ON, and then detect a purge concentration based on a pump downstream pressure or a pump differential pressure at a predetermined timing elapsed by a predetermined time from setting of the concentration sensing flag to ON.

An evaporated fuel processing device is installed to a vehicle having an internal combustion engine and a fuel tank and is configured to process evaporated fuel generated through evaporation of fuel in the fuel tank. A control device of the evaporated fuel processing device is configured to adjust an opening degree of a sealing valve based on a pressure of vapor-phase gas sensed with a pressure sensor and a concentration of evaporated fuel in the vapor-phase gas sensed with a concentration sensor and thereby adjust a supply amount of the evaporated fuel supplied to an air intake pipe at a time of executing a purge operation, in which the vapor-phase gas is purged from the fuel tank to the air intake pipe of the internal combustion engine.

An evaporated fuel processing device includes a relationship learning unit that, during a learning operation, learns the relationship between a valve opening start amount and a pressure difference. In particular, the relationship learning unit learns this relationship when a valve opening detection unit detects a plurality of different valve opening start amounts and a pressure difference detection unit detects a plurality of different pressure differences. Then, the relationship learning unit creates a relationship map between the valve opening start amount and the pressure difference. The evaporated fuel processing device then corrects the valve opening start amount based on this relationship map.

The present invention is directed to the use of an improved hydrocarbon adsorption system for the treatment of evaporative emissions from a motor vehicle. More specifically, the system includes one or more hydrocarbon adsorption elements being housed within a frame, the frame being permanently affixed within the air intake housing of engine.

The present disclosure describes an evaporative emission control canister system that includes: one or more canisters comprising at least one vent-side particulate adsorbent volume comprising a particulate adsorbent having microscopic pores with a diameter of less than about 100 nm; macroscopic pores having a diameter of about 100-100,000 nm; and a ratio of a volume of the macroscopic pores to a volume of the microscopic pores that is greater than about 150%, and having a retentivity of about 1.0 g/dL or less. The system may further include a high butane working capacity adsorbent. The disclosure also describes a method for reducing emissions in an evaporative emission control system.

The present disclosure relates to hydrocarbon emission control systems. More specifically, the present disclosure relates to substrates coated with hydrocarbon adsorptive coating compositions, air intake systems, and evaporative emission control systems for controlling evaporative emissions of hydrocarbons from motor vehicle engines and fuel systems.

An evaporative emission control canister system comprises an initial adsorbent volume having an effective incremental adsorption capacity at 25 C. of greater than 35 grams n-butane/L between vapor concentration of 5 vol % and 50 vol % n-butane, and at least one subsequent adsorbent volume having an effective incremental adsorption capacity at 25 C. of less than 35 grams n-butane/L between vapor concentration of 5 vol % and 50 vol % n-butane. The evaporative emission control canister system has a two-day diurnal breathing loss (DBL) emissions of no more than 20 mg at no more than 210 liters of purge applied after the 40 g/hr BETP butane loading step.