A refueling control system for an internal combustion engine includes a fuel tank; a vapor pipe; a step motor-driven shut-off valve; a fuel filler lid; and an electronic control unit configured to, when the fuel filler lid is to be opened, i) drive the shut-off valve such that the shut-off valve is opened, ii) close the fuel filler lid when an opening degree of the shut-off valve is less than a set opening degree, and iii) open the fuel filler lid when the opening degree of the shut-off valve is greater than or equal to the set opening degree. The electronic control unit sets the set opening degree such that the set opening degree when an opening speed of the shut-off valve is low is greater than the set opening degree when the opening speed of the shut-off valve is high.

Female quick couplings are disclosed that have a housing defining an axial bore having a first shoulder and a first slot transverse to the axial bore, a removable insert defining a restriction orifice seated against the first shoulder within the axial bore, and a locking member slidingly received in the first receptacle. The removable insert defines a restriction orifice having an upstream conical frustum and a downstream conical frustum mated at their respective smaller diameter. The upstream conical frustum has a largest diameter substantially similar to an internal diameter of the first sealing member and the downstream conical frustum has a largest diameter substantially similar to an internal diameter of the axial bore extending downstream of the first shoulder. The largest dimeter of the upstream conical frustum is larger than the largest diameter of the downstream conical frustum. Engine systems incorporating the female quick coupling are also disclosed.

A fuel system for a vehicle includes a first fluid flow path, a second fluid flow path, and a check valve. The first fluid flow path is configured to facilitate flow of liquid fuel into a fuel tank from a refueling nozzle. The second fluid flow path has parallel channels and is configured to facilitate flow of vaporized fuel between the fuel tank and a vapor canister. The check valve is disposed within a first of the parallel channels. The check valve is configured to close in response to the vaporized fuel flowing from the fuel tank to the canister. The check valve is configured to open in response to the vaporized fuel flowing from the canister to the fuel tank.

The present disclosure relates to an active purge system and an active purge method for a hybrid vehicle, and changes a control method for the throughput of the evaporation gas according to the engine torque according to a change in an optimal operating line, the system efficiency, or the state of charge (SOC) condition of a battery using an active purge unit for pressing the evaporation gas generated by a fuel tank and supplying the pressed evaporation gas to an intake pipe, thereby efficiently purging the evaporation gas.

Methods and systems are provided for diagnosing leaks/degradation in a fuel system. In one example, a system for a vehicle may comprise a variable volume device disposed within a fuel tank; an atmospheric port of the variable volume device fluidly coupled to a vent line upstream of a hydrocarbon sensor housed in the vent line, the vent line coupling a fuel vapor canister to atmosphere; and a controller storing instructions for monitoring output of the hydrocarbon sensor; and generating an indication of a degradation in the variable volume device based on the monitored hydrocarbon sensor. In this way, it is possible to effectively detect a degradation/leak in the variable volume device with minimal specialized components in the fuel system.

A fuel tank system constructed in accordance to one example of the present disclosure includes a fuel tank and an evaporative emissions control system. The evaporative emissions control system is configured to recapture and recycle emitted fuel vapor. The evaporative emissions control system includes a liquid trap, a first device, a second device, a control module and a G-sensor. The first device is configured to selectively open and close a first vent. The second device is configured to selectively open and close a second vent. The control module regulates operation of the first and second devices to provide over-pressure and vacuum relief for the fuel tank. The G-sensor provides a signal to the control module based on a measured acceleration.

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.

A modular structure for a mitigating evaporative fuel emissions, such as for an automobile, is described. The structure may include a plurality of frames and membranes for flowing fuel vapor and reducing the emission of hydrocarbon therefrom. The structure may include flow guides that provide a meandering flow path for both the fuel vapor and a permeate. A flow guide providing parallel flow paths is also described.

A vehicle includes an engine and a fuel system. The fuel system includes a fuel tank that stores liquefied petroleum (LP) fuel. The fuel tank includes a tank outlet port and a tank return port. The fuel distribution system supplies fuel from the fuel tank to the engine and returns unused fuel to the fuel tank. The fuel distribution system includes an engine supply line coupled to the tank outlet port, and a fuel rail disposed on the engine and coupled to the engine supply line. The fuel system includes a fuel discharge valve disposed on the fuel distribution system for removing fuel from the fuel distribution system.

Venting systems and methods are provided for a fuel system of an engine. In at least one example, the fuel system includes a fuel tank connected to a vapor recovery canister via a main conduit. The venting system includes an electrically actuated vent control valve, a plurality of sensors, and a control unit coupled to the sensors and to the electrically actuated vent control valve. The vent control valve is configured for being installed in the main conduit to thereby enable selectively opening or closing fluid communication between the fuel tank and the vapor recovery canister. The plurality of sensors are configured for providing data indicative of conditions relating to the tank. The control unit is configured for operating the electrically actuated vent control valve to open or close the fluid communication according to first predetermined criteria, wherein the first predetermined criteria include minimizing risk of liquid carry over (LCO) from the fuel tank to the vapor recovery canister. A corresponding method is also provided.