Abstract: The fuel tank system comprises a tank body for containing fuel therein, a canister for disposing said fuel component, a filler tube connected with the tank body and forming a channel for supplying fuel to the tank body, a vent side check valve having a first chamber and a second chamber separated by a diaphragm, a signal tube connecting the first chamber of the vent side check valve with the upper part of the filler tube, a vent side tube for connecting the tank body with the canister via the second chamber of the vent side check valve and for introducing a gaseous body containing fuel component in the tank body to the canister via the second chamber when filling fuel, and an orifice for the signal tube, provided on the upper part of the signal tube on the filler tube side and having such an inside diameter and a length that may prevent the fuel permeation into the signal tube side from the filler tube side.

Abstract: A pump device for performing a leak diagnosis of a fuel vapor retention system. The pump device is provided for a fuel vapor retention system of an internal combustion engine, having a pump membrane driven by an electromagnet and a magnetic armature, which membrane defines a supply chamber that has valve devices, wherein a first valve can be connected to ambient air via a delivery line and can be connected via a second valve to a feed pipe that has an adsorption filter, and having a stop valve between the delivery line and the feed pipe, which valve is embodied so that it can be electromagnetically actuated. The pump device according to the invention is provided for a fuel vapor retention system of an internal combustion engine.

Abstract: In a fuel discharge preventive device of a gas engine, in order to prevent high-pressure gaseous fuel remaining in a fuel distributing pipe when an engine is stopped, from leaking out of a gaseous fuel injection valve to be discharged to the open air, a fuel shut-off valve is provided in a fuel feed passage through which gaseous fuel is fed to the gaseous fuel injection valve, and a suction passage communicating with a gaseous fuel storing portion is branched off from the fuel feed passage between the gaseous fuel injection valve and the fuel shut-off valve, so that the gaseous fuel in a potion of the fuel feed passage located between the gaseous fuel injection valve and the fuel shut-off valve is stored in the gaseous fuel storing portion after the engine is stopped and hence the fuel shut-off valve is closed, while the stored fuel is purged to the engine when the engine is being operated.

Abstract: A fault diagnosis apparatus for a fuel evaporative emission suppressing system has an electronic control unit which inputs an average value of integral terms for air-fuel ratio feedback control, engine speed, etc. when diagnosis executing conditions are satisfied, and then starts opening operation of a purge control valve. Subsequently, the average value of integral terms, engine speed, etc. are input again. If no substantial change occurs in the average value, etc. with driving of the purge control valve, it is concluded that purge air for fault diagnosis has not been introduced, and that the suppressing system is faulty. In driving the purge control valve, its driving duty ratio is increased by a relatively small increment till the driving duty ratio reaches a predetermined duty ratio.

Abstract: A canister which can control the diffusion of evaporated fuel to surely prevent the evaporated fuel from blowing through into the atmosphere has a main chamber having therein a first adsorbent layer for adsorbing evaporated fuel and including an evaporated fuel lead-in port and a purge port, a subchamber having therein a second adsorbent layer for adsorbing evaporated fuel and including an atmospheric air lead-in port, and an air chamber communicating with the main chamber and the subchamber are provided in a casing of a canister. The air chamber is divided into three parts: a first chamber at the side of the main chamber, a second chamber at the side of the subchamber and a third chamber between the first and second chambers. A nonlinear communication passage is formed inside of the third chamber by dividing the third chamber with a partition wall having its both ends opened to the first chamber and the second chamber respectively.

Abstract: A leak diagnosis system for an evaporative emission control system executes a correction process of diagnosis decision value. When the purge control of the evaporative emission control system is not executed, a purging line of the system is set in the atmospheric condition for a predetermined time. A pressure sensor installed in the purging line detects a pressure value V.sub.A0 in the atmospheric condition. A control unit of the leak diagnosis system determines a leak decision value V.sub.P0 on the basis of the atmospheric pressure detection value and an equation V.sub.P0 =V.sub.A0 +.DELTA.V.sub.0 where .DELTA.V.sub.0 is a difference between the output value in the predetermined positive pressure P.sub.0 and the output value V.sub.A0 in the atmospheric pressure condition and is constant. Therefore, it becomes possible to accurately execute the leak diagnosis.

Abstract: An evaporative fuel-processing system for an internal combustion engine for use in a vehicle. A passage extends between the fuel tank and the intake passage of the engine, for guiding evaporative fuel generated in the fuel tank, for processing, and across which a canister having an air communication port is arranged. A drain passage is connected to the air communication port, to which a valve casing is connected. A first passage is connected to the valve casing, and a first valve is associated with the first passage and the valve casing, for allowing air to flow into the canister through the first passage, the valve casing and the air communication port and for inhibiting evaporative fuel from being discharged from the canister through the air communication port, the valve casing and the first passage.

Abstract: In an evaporative-fuel emission preventing apparatus, a differential pressure regulating valve provided in the course of a passageway for connecting a fuel tank and a canister includes a valve section and a case section including a conduit for connecting the differential pressure regulating valve and the canister. The valve section has a communicating hole for connecting the low and high pressure sections of the differential pressure regulating valve. Liquid fuel flowing into the low pressure section is returned to the fuel tank via the communicating hole. When fueling, the quantity of air in the communicating hole can be controlled by a convex portion. Further, the conduit has a communicating hole for connecting the conduit and the fuel tank. When an interlocking valve formed in the valve section moves with an opening operation of the valve section and is separated from the communicating hole, liquid fuel within the conduit can be returned to the fuel tank via the communicating hole.

Abstract: A fuel vapor storage canister having a leak-proof screen assembly between a mass of carbon granules in the storage canister and a purge port of the storage canister. The fuel vapor storage canister includes a cup-shaped plastic body, an integral partition which divides the canister body into a pair of relatively deep carbon bed chambers, and a plenum in the canister body at an end of one of the carbon bed chambers which is connected to the purge port and which is covered by the leak-proof screen assembly. The leak-proof screen assembly includes a plastic frame ultrasonically welded to the canister body and a flat fabric screen having a peripheral edge insert molded to the plastic frame.

Abstract: In a fuel tank with a filler neck of plastic material which filler neck is connected at one end to the fuel tank and has a filler opening at its other end, a vent pipe extending from the tank to the filler opening, an adsorber chamber with a chamber opening and a fuel vapor conduit providing for communication of the tank with the adsorber chamber are all integrally formed with the filler neck in a single blow molding step, the adsorber chamber, after being filled with a bag of activated carbon, being closed by a lid which carries a regeneration valve and covers the chamber opening.

Abstract: An evaporative emission control system which may be used in automotive vehicles is disclosed. The evaporative emission control system includes a canister, an inlet passage, a fuel vapor passage, an outlet valve, and an inlet valve. The air inlet passage is exposed at an end to the atmosphere and connected at the other end to the canister for drawing fresh air into the canister. The fuel vapor passage communicates between the canister and a fuel tank. When a pressure in the fuel tank is increased above a given level so that a difference in internal pressure between the fuel tank and the canister reaches a first value, the outlet valve establishes communication between the fuel tank and the canister to allow fuel vapor evaporated within the fuel tank to be drawn into the canister through the fuel vapor passage.

Abstract: The fault diagnostic apparatus of the present invention detects a failure (a leak) of a fuel tank of an engine. In this invention, space above the fuel level in the fuel tank is connected to a canister. The canister contains an adsorbent to adsorb evaporated fuel in the tank to prevent the evaporated fuel from being released to the atmosphere. Valves are provided to the canister to keep the internal pressure of the canister within a predetermined range. A control circuit of the engine employs a pressure sensor to monitor the internal pressure of the fuel tank, and determines whether the fuel tank has failed in accordance with a change in the internal pressure of the fuel tank. Since the change in the fuel level in the fuel tank varies in accordance with the fuel consumption rate, the change in the pressure in the fuel tank also varies in accordance with the fuel consumption rate.

Abstract: A fuel evaporative-gas emission preventing apparatus capable of reducing the quantity of adsorption of a canister as low as possible by a single breather at any fueling speeds and allowing emissions to fall within given limits. One end of the breather is coupled to a portion near a port of an inlet pipe for a fuel tank and a differential pressure regulating valve is connected to the other end of the breather. The canister is coupled to the differential pressure regulating valve. An opening-area variable device is provided at an intermediate portion of the breather and adjusts the quantity of a fuel evaporative-gas in the breather according to an internal pressure of the fuel tank.

Abstract: A canister in which a supplying conduit is disposed at a position to penetrate through layers of an absorbent, includes a casing made of resin which includes a peripheral wall and a bottom integrally formed on the lower surface of the peripheral wall, and is opened at the top, a conduit support portion formed on the inner surface of the bottom, the supplying conduit secured in the conduit support portion and extended upright, and a top cover made of resin which is welded on an upper end portion of the casing. A purge port is attached to the top cover and has a recess into which the supplying conduit is inserted. The supplying conduit is dimensioned so that it creates a circumferential gap between the recess and the upper portion of the supplying conduit.

Abstract: During the stoppage of an internal combustion engine or the refueling of a fuel tank, evaporative fuel is collected in a canister, and then only the air contained in the evaporative fuel is discharged into the atmosphere. To achieve this, the canister is provided with a plurality of atmosphere communication lines communicating with the atmosphere side, an air cut valve is installed respectively in each of these atmosphere communication lines, and control means for controlling the operation of the air cut valves is provided.

Abstract: A deventilating device for motor vehicles is disclosed. The deventilating device allows, in the fuel tank and connected system parts, a limited overpressure which, on the one hand, is safe and, on the other hand, affords the possibility of checking the tightness of the system by on-board means specific to the vehicle.

Abstract: The amount of flow in a canister is controlled, in a fuel-vapor emission-control system, in response to the operating condition of an engine, control being performed of the size of a release port on the canister responsive to the amount of purge, thereby enabling a large purging amount. An electromagnetic valve capable of changing the surface area of the port is provided at the atmospheric side of a port of the canister. The degree of opening of this electromagnetic valve is varied, depending on the conditions of refueling, traveling, and parking, and during a purge, the opening of the electromagnetic valve when the amount of purge is large is made larger then when the amount of purge is small. By doing this, the recovery of hydrocarbons from the canister when purging is done is speed up, thus improving the working capacity of the canister.

Abstract: A fuel vapor capturing canister includes a cylindrical casing having a communicating hole which is formed at one end so as to communicate with the atmosphere and another communicating hole which is formed at the other end so as to communicate with a fuel tank and an intake system of an engine. An adsorbent is accommodated in the casing so as to form at least one layer. A pair of partitioning plates partition the adsorbent layer longitudinally of the casing. A deflecting plate is disposed between the partitioning plates so as to protrude from an inner wall face of the casing inwardly of the same. The partitioning plates are open in the vicinity of sides of the deflecting plate respectively.

Abstract: A fuel vapor treatment device or canister for a vehicle evaporative emission control system has a casing filled with a fuel vapor absorbent material in its chamber. A relay pipe projects outwardly from one end the casing and communicates with the chamber. A liquid-fuel separator having a cavity is sealingly mounted to the one end of the casing so that the relay pipe extends into the cavity. Inlet and outlet pipes, which communicate with the cavity and fuel vapor, are formed in the separator. A fuel vapor outflow passage is formed inside the separator and communicates with the outlet pipe. The suction pipe has a reduced size section with an orifice. A liquid-fuel suction pipe, which communicates with the outflow passage through the orifice, extends perpendicularly downwardly from the outflow passage. The suction pipe extends from the orifice to the area where the liquid-fuel collects.

Abstract: A fuel vapor recovery control valve device, for controlling the discharge of fuel vapor from a fuel tank having a fuel filler port, includes a housing; a first valve assembly, which is moved up and down by a diaphragm which divides the space in the housing into an upper chamber and a lower chamber; and a second valve assembly provided in the lower chamber. The diaphragm is of double operation film structure including a central node portion, and an intermediate node portion between the central node portion and its outer peripheral portion. A cylindrical partition wall, which is abutted against the central node portion of the diaphragm, divides the upper chamber into an upper inside chamber, which is communicated with a first vapor flow-in port of the housing, and an upper outside chamber, which is communicated through a signal port with the fuel filter port. Thus, the first vapor flow-in port can be sealingly closed by the diaphragm.

Abstract: Fuel vapor in a fuel tank of a vehicle is adsorbed in a canister, released from the canister under negative intake pressure while a vehicle is being driven, and supplied to an engine intake passage. A valve is provided in a purge passage extending from the canister to the intake passage. Liquefied fuel is prevented from accumulating in the valve and purge passage by situating this valve at a higher position than a first connecting part connecting the canister with the purge passage, and a second connecting part connecting the purge passage with the intake passage. In this way, faulty operation of the valve due to the accumulated fuel turning to gum is prevented, richness of the air-fuel ratio due to accumulated fuel when purge starts is prevented, and impairment of engine drivability and exhaust gas composition are prevented.

Abstract: A canister is comprised of a casing including a top wall, a vertical wall, first and second chambers formed in the casing and each accommodating an adsorbent, and a partition member partitioning the first and second chambers from each other. A plurality of first protuberances are formed on the inner surface of the top wall at a portion thereof facing toward the first chamber, and a plurality of second protuberances on the inner surface of the vertical wall at a portion thereof facing toward the first chamber. First and second filters are mounted in the first chamber in a fashion abutting on the plurality of the first and second protuberances, respectively. A first space is defined in the top wall between the first filter and the portion of the inner surface of the top wall, and a second space is defined in the vertical wall between the second filter and the portion of the inner surface of the vertical surface and communicates with the first space.

Abstract: A canister includes a partition wall which extends toward the lid member with one end thereof connected to the end wall and opposite sides are connected to an inner surface of the casing body. First and second adsorbent layers, formed by an adsorbent, are retained between first and second filters and a third filter, respectively. The first and second filters are fixedly disposed on opposite sides of the partition wall to define first and second chambers between the first and second filters and the end wall, respectively. The third filter is placed and carried on an inner surface of a support plate which is fitted in the casing body and which has a large number of communication bores. The support plate and a lid member are biased by a spring in a direction to compress the first and second adsorbent layers.

Abstract: A fuel vapor treating apparatus for an engine provided with a fuel tank and a canister is disclosed. The fuel tank is communicated with the canister by a vapor line and a breather line. The canister has a partition which defines a main chamber and a sub-chamber therein. A plate provided in the sub-chamber further defines two compartments therein. The plate has a plurality of holes on its entire surface. When fuel vapor flows through the holes, fuel components suspended in the fuel vapor are adsorbed and collected by an adsorbent. The adsorbent pellets of the two compartments divided by the partition are kept from contacting each other. This suppresses diffusion of the fuel vapor between the upper and lower chambers. The total area of the holes on the plate is greater than the passage area of the breather line. Accordingly, the venting resistance of the plate is relatively low. Thus, the venting resistance inside the canister is relatively low.

Abstract: According to the present invention, an evaporative fuel absorbing chamber absorbingly treating evaporative fuel, a second atmospheric chamber communicating with the evaporative fuel absorbing chamber, and a first atmospheric chamber separated from the second atmospheric chamber with a partition wall are formed in a case. An upper cover for forming the upper wall of the first atmospheric chamber has a cylindrical convex portion extending inside the first atmospheric chamber. When the upper cover is fixed after inserting the bottom end of an eletromagnetic valve into a communicating hole of the partition wall, the top end of the electromagnetic valve is fastened to the cylindrical convex portion. Thus, the electromagnetic valve is prevented from being clattered, and air leakage from between the communicating hole and the electromagnetic valve can be reduced.

Abstract: A tank venting system includes first and second tank valves and a valve for controlling venting from valves to vapor recovery canister. The valve includes a housing containing a first valve assembly for controlling venting of the first tank valve and a second valve assembly for controlling venting of the second tank valve. A vent conduit defines a bleed passageway for dissipating pressurized fuel vapor in a housing flow tube to a filler neck through a signal port and a passageway. A tube includes a vacuum-relief passageway and a valve for regulating flow of ambient air from the signal passageway into the housing when a cap is off the filler neck.

Abstract: A fuel vapor treatment device adapted to prevent evaporative emission from an automotive vehicle has a casing formed of a plastic and defines therein a space filled with a fuel vapor absorbent. An end wall is sealingly connected to a first end of the casing and provided with a first pipe through which fuel vapor is charged to the space, and a second pipe through which the fuel vapor within the space is purged. A cover plate is sealingly connected to a second end of the casing. A partition member is integral with the casing and disposed within the space of the casing to define first and second chambers. The partition member includes first and second partition walls that are parallel with each other and form a predetermined space therebetween. The partition member further includes a first lateral wall to connect first ends of the respective first and second partition walls, and a second lateral wall to connect second ends of the respective first and second partition walls.

Abstract: A fault diagnosis apparatus for detecting a fault in a fuel evaporative emission suppressing system comprises an electronic control unit. When fault diagnosis execution conditions are fulfilled, the electronic control unit stores an average of integral term values for air-fuel ratio feedback control, operating position of an idling speed control valve, and engine speed, and then actuates a purge control valve of the suppressing system so that the valve opens. In a predetermined time period after the actuation of the purge control valve, the integral term average and the like are stored again. If any changes of the integral term average and other values caused by the actuation of the purge control valve are detected, the suppressing system is concluded to be normal. If no changes are detected, on the other hand, the suppressing system is concluded to be faulty.

Abstract: A canister for preventing diffusion of fuel vapor to atmosphere is disclosed herein. The canister includes a first case having an adsorbent material, such as activated charcoal, therein and a second case also having an adsorbent material therein. The two cases are joined by a passage having a valve disposed therein. The valve regulates the airflow between the two cases. The first case is connected to the valve, a gas tank, and an engine, while the second case is connected to the valve and to atmosphere. During a refueling operation, the valve is operated so as to allow air to flow from the tank, through the first case and out to the atmosphere through the valve, without passing through the second case.

Abstract: A fuel emission control device for an engine comprises an adsorbent for temporarily adsorbing fuel vapor therein. A canister for housing the adsorbent therein is connected to a fuel tank via a fuel vapor passage, through which fuel vapor in the fuel tank is introduced into the canister. The canister is also connected to an intake passage downstream of a throttle valve via a purge passage, through which fuel vapor adsorbed in the adsorbent is purged into the intake passage. When an amount of fuel vapor to be introduced to the canister becomes larger, the effective volume of the adsorbent interposed between the fuel vapor passage and the purge passage is made larger.

Abstract: Fuel vapors leaving the fuel tank of a motor vehicle are recovered with a filter cartridge inserted between the tank and the intake manifold of the engine. An atmospheric connection duct of the cartridge can be selectively connected to the intake partial vacuum with a pneumatic distributor. The leaktightness of the device is thereby tested.

Abstract: A system for correcting an output from a tank internal-pressure sensor in an evaporative fuel processing device including a fuel tank, and a tank internal-pressure sensor provided in the fuel tank or in an evaporative fuel passage between the fuel tank and a pressure regulating valve. In a condition in which it is difficult to generate an evaporative fuel within the fuel tank, a canister opened to the atmosphere and the fuel tank are brought into communication with each other over a predetermined time. A reference value is reset based on a first detection value detected immediately before the communication, a second detection value detected immediately before releasing the communication, and a reference value stored in a reference value storing device. Thus, it is possible to enhance the accuracy of correction of the output from the tank internal-pressure sensor.

Abstract: A fuel vapor capturing canister includes a casing formed into the shape of a cylinder and accommodating an adsorbent material and a plurality of partition plates each formed of an impermeable material. The adsorbent material accommodated in the casing has one of two faces communicating with the atmosphere and the other face communicating both with a fuel storage system and an intake system of an engine. The partition plates are disposed in the casing so as to divide the adsorbent material into a plurality of layers. The partition plates has respective communicating holes formed so as not to lie one above another. This arrangement of the partition plates lengthens a path of fuel vapor passing through the activated carbon layers. Since the distance of flow of the fuel vapor in contact with the adsorbent material is thus increased, the fuel component adsorbing efficiency can be improved.

Abstract: A fuel vapor capturing canister includes a casing formed into the shape of a cylinder and accommodating an adsorbent material. A partition member divides the activated carbon into lower and upper layers. The partition member includes a cross rib and upper and lower walls sandwiching the rib. One of four pieces of the cross rib is connected to the inner peripheral wall of the partition member. Two chambers located at both sides of the piece connected to the inner peripheral wall of the partition member communicate with each other through a communicating path defined between the other pieces of the rib and the inner peripheral wall of the partition member. One of the two chambers has in its underside openings communicating with the lower activated carbon layer while the other chamber has in its top openings communicating with the upper activated carbon layer. The fuel vapor flows between the two layers of activated carbon.

Abstract: In a fuel vapor processing device for transferring fuel vapor from a fuel tank to a canister when fuel is fed into the fuel tank through a fuel fill pipe or when the pressure in the fuel tank is raised to a predetermined value, a pressure given through the fuel fill pipe is applied to one side of a first diaphragm valve body forming a first diaphragm valve while a pressure given through a fuel tank passageway is applied to the other side thereof, so that, when the pressure in the fuel tank passageway is increased while fuel is being supplied into the fuel tank, a first communicating hole is opened; and the atmospheric pressure is applied to one side of a second diaphragm valve body forming a second diaphragm valve while a pressure given through the fuel tank passageway is applied to the other side, so that when the pressure in the fuel tank becomes higher than the atmospheric pressure by a predetermined value a second communicating hole is opened.

Abstract: A fuel vapor emission control system for connection to an engine having a fuel tank, so as to purge fuel vapor introduced thereto into the engine, comprises primary and secondary adsorbing layers for temporarily adsorbing fuel vapor introduced thereto. The primary and the secondary layers are connected in series. The air is introduced into, in turn, the primary and the secondary layers so that the air passing therethrough desorbs fuel vapor therefrom, and then into the engine, together with fuel vapor desorbed from the primary and the secondary layers, when the engine is running. During an engine fuelling operation, fuel vapor is introduced from the fuel tank to the primary layer. When the engine is running, fuel vapor is introduced, from the fuel tank, into the engine by bypassing the primary and the secondary layers.

Abstract: An evaporative fuel-processing system for an internal combustion engine includes a charging passage extending between the canister and the fuel tank of the engine, a purging passage extending between the canister and the intake system of the engine, an open-to-atmosphere passage for communicating the interior of the canister to the atmosphere, a first control valve for selectively opening and closing the purging passage, and a second control valve for selectively opening and closing the open-to-atmosphere passage. A tank internal pressure sensor detects pressure within the evaporative fuel-processing system, and an ECU determines abnormality of the evaporative fuel-processing system, based on a variation in the detected pressure after the interior of the evaporative fuel-processing system is negatively pressurized into a predetermined negative pressure state.

Abstract: An evaporative fuel-processing system for an internal combustion engine includes a canister accommodating an adsorbent therein, for adsorbing evaporative fuel generated in a fuel tank of the engine, and a charging passage connecting between the canister and the fuel tank. A shutter valve is arranged in a fuel supply pipe of the fuel tank in the vicinity of an inlet end thereof, for isolating the interior of the fuel supply pipe from the atmosphere, and the shutter valve is disposed to be opened by the tip of a refueling gun when the latter is inserted into the fuel supply pipe. A pressure-intake port section is arranged in the fuel supply pipe at a side of the shutter valve closer to the main body of the fuel tank, for taking in pressure within the fuel supply pipe.

Abstract: According to one embodiment of the invention, a purge quantity is controlled in proportion to an air quantity sucked into an internal combustion engine. During normal operation of the engine, a purge air-fuel ratio is calculated according to a purge rate and an air-fuel feedback control quantity. During transient operation of the engine, a target air-fuel ratio feedback control quantity is calculated according to the purge rate and the purge air-fuel ratio. When the difference between the air-fuel ratio feedback control quantity and the target air-fuel ratio feedback control quantity is greater than a predetermined value, the air-fuel ratio feedback control quantity is corrected to the target air-fuel ratio feedback control quantity. An undue fluctuation in air-fuel ratio of a fuel mixture supplied to cylinders occurring upon rapid fluctuation in purge rate can be suppressed.

Abstract: An evaporative fuel-adsorbing device adsorbs evaporative fuel generated from a fuel tank of an internal combustion engine. A partition divides the interior of a casing at least into a first adsorbent chamber and a second adsorbent chamber. Adsorbents are charged in the first adsorbent chamber and the second adsorbent chamber, respectively, for adsorbing the evaporative fuel. The evaporative fuel from the fuel tank is permitted to flow into the first adsorbent chamber via a charging port provided therein. The evaporative fuel desorbed from the adsorbents in the adsorbent chambers are permitted to flow out of the first adsorbent chamber via a purging port provided therein. The second adsorbent chamber is communicated with the atmosphere via an air-inlet port.

Abstract: An evaporative emission control system for an internal combustion engine includes a canister for adsorbing evaporative fuel generated in the fuel tank, a first introducing passage for introducing evaporative fuel generated in the fuel tank into the canister on an occasion other than at refueling, a purging passage for purging evaporative fuel adsorbed in the canister into the intake passage of the engine, and a first air-inlet passage communicating between the canister and the atmosphere. First and second adsorbent chambers are formed in the canister and each accommodating an adsorbent. The first introducing passage and the purging passage are connected to the first adsorbent chamber. The first air-inlet passage is connected to the second adsorbent chamber. A communication passage communicates between the first adsorbent chamber and the second adsorbent chamber.

Abstract: In an evaporative fuel processing device, a canister is divided into first, second, third and fourth chambers by partition walls. A control valve is provided in a communication passage which connects the second and third chambers to each other. A first charge passage is connected to an upper space in a fuel tank and to a port in the third chamber, and a second charge passage is connected to a fuel supply valve for the fuel tank and to a port in the first chamber. Further, a purge passage is connected to an intake passage of an internal combustion engine and to a port in the first chamber. The control valve is connected to an electronic control unit, and opened during refueling and during traveling of a vehicle and closed during parking of the vehicle. Thus, it is possible to reliably prevent an evaporative fuel from being released to the atmosphere, while the capacity of the canister to a minimum.

Abstract: A carbon-filled fuel vapor filter system, including a polymer housing, the polymer housing including a hose inlet, a hose outlet, and a formed block of carbon pellets or granules with a polymer binding between the carbon pellets or granules contained within the fuel filter housing.

Abstract: The invention relates to a method for checking the operability of a cyclically controlled regeneration valve in a tank venting system of a motor vehicle which utilizes the realization that during operation of the system significant pressure variations are generated in a discharge line arranged between an adsorption filter and the regenerating valve whenever the duty ratio of the regeneration valve is within a certain range. If the regeneration valve is operated at such a duty ratio, the pressure variations in the discharge line are recorded and the extreme pressure valves are determined in an evaluation device for a specified time period after which the difference between the maximum and the minimum pressures is determined and if this difference is below a predetermined threshold, the regeneration valve is indicated as being defective.

Abstract: A head valve for maintaining a desired pressure head in a vehicle fuel tank which responds automatically to pressure changes in the filler pipe corresponding to a change from normal vehicle operation to a refueling operation to adjust the pressure head maintained by the head valve. In a vehicle fuel system including a filler pipe selectively opened and closed by a cap, the valve of the present invention responds to pressure changes near the filler pipe inlet upon removal of the cap to increase the pressure head it maintains in fuel tank 10 and prevent the fuel tank from being overfilled. When the refueling operation is completed and the cap is replaced, the change in pressure near the filler pipe inlet operates the valve to decrease its head valve closing force and reduce the pressure head maintained in the tank for normal vehicle operation.

Abstract: An air-fuel ratio control apparatus of an internal combustion engine in which a canister to adsorb and hold evaporated fuel is provided in a supply passage which communicates an intake passage of the internal combustion engine and a fuel tank, and an atmosphere opening/closing valve is provided so as to open the canister to the atmosphere. A purge valve is provided in the supply passage between the intake passage and the canister, and a pressure sensor communicates with the supply passage between the canister and the fuel tank. A control that closes the atmosphere opening/closing valve is closed when leakage is judged and reduces a pressure in the fuel tank to a predetermined negative pressure value, and thereafter closes the purge valve so that a leakage state of an evaporating system is discriminated.

Abstract: An apparatus and method for use in diagnosing an evaporative emission canister collection and purge system. An EVAP system of a vehicle can be diagnosed through the use of a swellable adsorbent disposed in the system's canister. The swellable adsorbent is expandable upon adsorption of fuel vapors and contractible upon desorption. By sensing the expansion and contraction response, a diagnostic mechanism can determine whether the vapor collection and purge functions are operating properly.

Abstract: A fuel tank includes a vent cutout valve having a first chamber connected to a vent tube, a second chamber communicating with a canister and a third chamber connected to an evaporation tube. The first and second chambers are defined by a first partition wall with a first communication bore and the second and third chambers are defined by a second partition wall with a second communication bore. A main body of the vent cutout valve is disposed within the second chamber to open the first communication bore when a shutter presses the main body of the vent cutout valve, and is provided with a check valve to close the second communication bore which is biased toward the second partition wall by a resilient member interposed between the check valve and the valve main body of the vent cutout valve.

Abstract: A fuel vapor purging system includes a container in which a set of divided chambers are formed by partition walls. Absorbent is disposed in the divided chambers. The divided chambers are sequentially connected to form a zigzag passage. Fuel vapor can enter the container from a fuel tank via a vapor line connecting the fuel tank and the container. In the container, an end of the vapor line faces the divided chamber which occupies an end of the set of the divided chambers. In the container, the fuel vapor is absorbed by the absorbent. Air can escape from the container via an opening in the container. The fuel vapor can be separated from the absorbent. The separated fuel vapor can be drawn into a suitable drawing device such as an engine air induction device via a purge line connecting the container and the drawing device. Fresh air can flow into the container via an air inlet provided on the container.

Abstract: A tank internal pressure-detecting device for an internal combustion engine having an evaporative emission control system for controlling purging of evaporative fuel generated in a fuel tank thereof into an intake system thereof. An ECU interrupts purging of evaporative fuel by the evaporative emission control system for a predetermined period of time after the engine is started. The ECU causes control valves of the evaporative emission control system to open the interior of the fuel tank to the atmosphere, and stores a value of pressure within the fuel tank detected by a tank internal pressure sensor as a reference value while the purging is being interrupted and at the same time the interior of the fuel tank is opened to the atmosphere. The ECU corrects an output value of the tank internal pressure sensor, based upon the reference value stored.