A vaporized fuel processing device includes a fuel tank storing fuel used for an internal combustion engine, a pressurizing portion performing a pressurizing process to increase an inner pressure of the fuel tank by supplying gas from outside to inside the fuel tank, and a controller controlling an operation of the pressurizing portion. The controller controls the pressurizing portion to perform the pressurizing process and to keep the inner pressure of the fuel tank at or above a predetermined pressure value at which vaporized fuel is prevented from flowing out of the fuel tank, except for a time of fueling of the fuel tank.

A fuel vapor treatment apparatus is provided with a fuel tank for storing fuel of an internal combustion engine, a canister for adsorbing fuel vapor generated in the fuel tank, a pump for reducing a pressure inside a detection target system including the fuel tank, a pressure detection sensor for detecting the pressure inside the detection target system, and a fluctuation detection unit for detecting a fluctuation width of the pressure inside the detection target system at the time when the pressure inside the detection target system is reduced to a predetermined pressure value.

An electrically driven pump for gases or gas mixtures having a pump housing and a motor housing. A radial pump having a pump impeller is formed in the pump housing, and the pump impeller is connected to a drive shaft which extends through a wall of the pump housing into the motor housing. At least one air gap is formed between the drive shaft and the wall of the pump housing. A pressure side is formed in the pump housing, and is arranged in the outer radial region of the pump impeller. An opening through the pump housing is formed in the region of the pressure side, and the opening connects the interior of the pump housing to the interior of the motor housing, such that the pressure prevailing on the pressure side may propagate into the interior of the motor housing.

A pressure sensor for an evaporated fuel leak detector is used for checking a leak in a fuel tank and a canister. The pressure sensor includes a sensor unit, a case, and a sealing resin. The sensor unit has a pressure receiving portion, a plurality of conduction terminals, and a mold resin portion. The case is provided with a fluid flow path and a housing recess. The case has an annular inner wall surface that defines the housing recess and surrounds a side surface of the mold resin portion. The inner wall surface of the case is provided with a stepped surface that is parallel to the pressure receiving surface or is inclined by an internal angle of less than 90° with respect to the pressure receiving surface, in a cross section along a direction perpendicular to the pressure receiving surface.

Methods and systems are provided for conducting an engine off natural vacuum test in a vehicle in order to indicate the presence or absence of undesired evaporative emissions. In one example, a vehicle fuel system and evaporative emissions system are sealed from atmosphere, and responsive to a pressure increase below an expected threshold, the fuel system and evaporative emissions system are actively pressurized via circulating hot engine coolant to a heater core and blowing hot air through the vehicle cabin to the fuel system via a three way ventilation valve in the rear of the vehicle. In this way, false failures of EONV test procedures due to environmental factors and vehicle operator drive habits may be reduced, and unnecessary engine service may be avoided.

A valve assembly, such as a canister purge solenoid (CPS) having one or more interchangeable components which may be used to reconfigure the valve assembly to have one or more additional vacuum ports. The design of the valve assembly eliminates the need to mold these ports into the intake manifold, simplifying the design of the manifold, and the tooling needed to make the manifold. The direct mount design of the CPS of the present invention includes at least one additional port to serve as an additional vacuum port to be used for any other purpose, such as a PCV valve, brake booster, or the like.

Methods and systems for distributing engine output among vehicles of a consist are disclosed. One example system comprises a controller including non-transitory media having instructions stored on the media and executed by the controller for adjusting distribution of engine output between at least a first engine and a second engine in response to a regeneration mode, wherein the regeneration mode regenerates an exhaust gas recirculation (EGR) cooler that is coupled to the first engine.

A fuel tank system includes a fuel storage unit, a processing unit, and a control unit. The control unit performs a first failure diagnosis of diagnosing a failure of the fuel storage unit in a state where the sealing valve is closed. When the control unit diagnoses that the fuel storage unit is normal, the control unit performs a second failure diagnosis of diagnosing a failure of a purge valve and a bypass valve by causing a pressure generation unit to generate pressure in a state where the sealing valve is closed. When there is a possibility that the purge valve and the bypass valve are in closed-sticking, the control unit performs a third failure diagnosis of specifying a failure in any one of closed-sticking of the purge valve and closed-sticking of the bypass valve by opening the sealing valve.

An evaporation leakage checking system includes a pump, a pump passage unit, a tank passage unit, a specified passage unit, an atmosphere passage unit, a flow-passage area changing unit, an atmosphere valve unit, a pressure sensing unit, and a control unit. The control unit includes a calculating unit that calculates a leakage threshold, based on a first pressure, a first area, an Nth pressure, an Nth area, and a reference area that is predetermined, and a leakage checking unit that activates the pump, closes the atmosphere passage unit by changing the flow-passage area of the atmosphere passage unit by using the atmosphere valve unit, and checks the existence of the evaporation leakage based on the leakage threshold and a checking pressure that is the pressure sensed by the pressure sensor in a case where a communication between the tank passage unit and the pump passage unit is allowed.

The present disclosure relates to internal combustion engines and its teachings may be applied to methods for leakage diagnosis in a fuel tank system. A method for diagnosing leakage may include: closing a fresh air line and a hydrocarbon/air mixture line connected to the fuel tank; measuring a first pressure change in the fuel tank system over a predefined first time interval; opening the fresh air line; operating the purge air pump until a predefined excess pressure is reached; closing the fresh air line; measuring a second pressure change over a predefined second time interval; and comparing the pressure changes to diagnose a leakage in the fuel tank system.