In accordance with the present invention, there are provided simplified systems and methods for catalytically deactivating, removing, or reducing the levels of reactive component(s) from the vapor phase of fuel storage tanks. The simple apparatus described herein can be utilized to replace complex OBIGGS systems on the market. Simply stated, in one embodiment of the invention, the vapor phase from the fuel tank is passed over a catalytic bed operated at appropriate temperatures to allow the reaction between free oxygen and the fuel vapor by oxidation of the fuel vapor, thus deactivating reactive component(s) in the gas phase.

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.

A method for producing an active carbon filter for a carbon canister includes forming a body having a honeycomb structure with a plurality of bleed passages from a polymer based material, and forming an adsorption layer along a surface of the body, where the adsorption layer is made of a carbon based material.

An evaporated fuel treatment apparatus includes a main canister containing an adsorbent that is capable of adsorbing and desorbing evaporated fuel generated in a fuel tank; a sub-canister connected to the main canister, the sub-canister containing an additional adsorbent that is capable of adsorbing and desorbing evaporated fuel contained in an exhaust discharged from the main canister; and a connection pipe that connects the main canister and the sub-canister. The connection pipe includes a first portion that is located near a muffler, and a second portion which is a portion other than the first portion, the second portion being located apart from an exhaust pipe and located below the first portion in the vertical direction with respect to the vehicle.

An evaporated fuel treatment apparatus calculates concentration of purge gas from the characteristics of density of purge gas and the characteristics of a pump discharge pressure with respect to two butane ratios that have been stored in advance and a detected value of the pump discharge pressure detected by a pressure sensor, calculates concentration of purge gas by correcting the concentration of the purge gas based on an A/F detected value in an engine such that a controller controls an open degree of a purge valve and a pump speed of a purge pump during execution of purge control based on the concentration of the purge gas.

A canister includes a charge port, a purge port, an atmosphere port, a main chamber, a sub chamber, activated carbon, and additional activated carbon. The sub chamber communicates with the main chamber. The atmosphere port is connected to the sub chamber directly or via an additional chamber. The activated carbon is stored in a main volume (Vmain) in the main chamber. The additional activated carbon is stored in a sub volume (Vsub) in the sub chamber. A ratio of a length L in a gas flow direction to an equivalent diameter D in a section perpendicular to the gas flow direction is 2 or more for the sub chamber. A ratio of a volume of the activated carbon stored in the main chamber to a volume of the activated carbon stored in the sub chamber (Vmain/Vsub) is more than 7 and equal to or less than 10.

Sorbent material sheets products that include sorbent material sheets and at least one porous cover layer are attached to an inner wall surface that is defined by an air intake. The sorbent material sheets collect vapors such as hydrocarbon vapors from engine components such as the combustion chamber, injectors, carburetor, fuel ports, crankcase, or other engine components, thereby reducing evaporative emissions. In certain configurations, the sorbent material sheet product includes an edge seal that improves the handling of the sorbent material sheets during the manufacturing process.

An evaporated fuel treatment apparatus includes a partition wall for dividing the inside of a canister into a first region located close to a purge passage and a fuel tank and a second region located close to an atmosphere passage, an electromagnetic valve provided in the partition wall and configured to open and close between the first and second regions, a small hole provided in the partition wall to release the pressure between the first and second regions, and a determination unit for performing a leak determination of the apparatus and a failure determination of a purge valve and the electromagnetic valve based on behaviors of the internal pressure of the canister according to opening and closing operations of the electromagnetic valve.

A fuel vapor processing apparatus includes a case having a passage. In addition, the case has a tank port and a purge port in fluid communication with one end of the passage. Further, the case includes an atmosphere port in fluid communication with another end of the passage. The passage has a first layering and a second layering filled with an adsorbent and arranged in series. The first layering includes an upper adsorption layer, a middle adsorption layer, and a lower adsorption layer arranged in series. The upper adsorption layer and the lower adsorption layer are filled with a first adsorbent. The middle adsorption layer is filled with a second adsorbent. The ventilation resistance of the middle adsorption layer due to the second adsorbent is greater than the ventilation resistance of the upper adsorption layer and the lower adsorption layer due to the first adsorbent.

An improved evaporative emission mitigation system for a motor vehicle includes a canister filled with an adsorbent material connected to a membrane module. The membrane module contains a membrane that separates gaseous hydrocarbons from inert air components within fuel vapor generated by the evaporation of fuel due to the heating of the motor vehicle. The gaseous hydrocarbons separated by the membrane are returned to the canister, where they will again be adsorbed by the adsorbent material. The inert air components are vented from the membrane module into the open atmosphere outside of the motor vehicle.