An active purge system may include: a canister to collect therein an evaporation gas evaporated from a fuel tank; a purge line to connect the canister to an intake pipe; a purge pump to pressurize the evaporation gas to allow the evaporation gas to move from the canister to the intake pipe; a purge valve installed on the purge line to be located between the purge pump and the intake pipe; and an engine connected to the intake pipe. In particular, the engine includes an injector installed on a cylinder head, an intake valve, and an exhaust valve.

A method for detecting reverse flow for a dual fuel engine is disclosed. The engine may include an intake manifold, a liquid fuel supply line and a gaseous fuel supply line, the gaseous fuel supply line including a gaseous fuel supply and a gaseous fuel rail. The method may include: operating the dual fuel engine in a liquid fuel only mode via the liquid fuel supply line; determining a reverse flow in the gaseous fuel supply line; and outputting an indication of reverse flow in response to the determination of reverse flow.

A multiple fuel tank purge system and method includes providing a pair of fuel tanks, including a main fuel tank for containing impure fuel and a separate, auxiliary fuel tank that contains commercial canned fuel. The engine runs on the impure fuel from the main fuel tank while the engine is in normal use, and then employs a shutdown cycle that switches to the commercial canned fuel from the auxiliary fuel tank for some pre-set time period. This arrangement allows the engine to be purged of the impure fuel (by burning the impure fuel during the shutdown cycle) and replaced by the commercial pre-mixed fuel before the engine is finally shut down. The system may further include a novel fuel cap with a fuel line, a tank within a tank fuel container, and/or an electronically actuated shutdown cycle mechanism.

A method for operating a common-rail fuel supply system of an internal combustion engine includes determining, dependent on an operating point of the engine, a set point rate of delivery of the high-pressure pumping device, and a set point pressure for the pressure storage system under high pressure, determining, dependent on a deviation between the set point pressure and an actual pressure in the pressure storage system, for a first part quantity of the throttle valves a closed-loop control portion for the position of the respective throttle valve, and activating the first part quantity of the throttle valves with the closed-loop control portion in addition to open-loop control for only the respective throttle valve of the first part quantity of the throttle valves. The, or each, throttle valve of a second part quantity of the throttle valves is exclusively activated with the open-loop control portion.

An active purge system may include: a canister to collect therein an evaporation gas evaporated from a fuel tank; a purge line to connect the canister to an intake pipe; a purge pump to pressurize the evaporation gas to allow the evaporation gas to move from the canister to the intake pipe; a purge valve installed on the purge line to be located between the purge pump and the intake pipe; and an engine connected to the intake pipe. In particular, the engine includes an injector installed on a cylinder head, an intake valve, and an exhaust valve.

A method for operating a drive system of a motor vehicle having a combustion engine, a fuel tank, and an evaporative emission control system, includes the following steps: opening a canister-purge valve of the evaporative emission control system; using a first sensor of the motor vehicle designed as a pressure sensor to ascertain an evaporative emission control system pressure prevailing in the evaporative emission control system between a filter device of the evaporative emission control system and the canister-purge valve; using a measurement device of the motor vehicle to ascertain an ambient pressure of the motor vehicle; using a computational device of the motor vehicle to compute a flow volume of a fluid streaming through the canister-purge valve on the basis of the ascertained evaporative emission control system pressure and the ascertained ambient pressure; and using an engine control device of the drive system of the motor vehicle to operate the drive system taking into account the computed fluid flow volume.

A vaporized fuel treatment device includes a sealing valve disposed in a vapor passage between a fuel tank and a canister and is configured to include a valve element moves forward and backward in an axial direction to a valve seat, a cut-off valve configured to cut off a communication between the canister and an atmosphere, a tank internal pressure sensor detects an internal pressure of the fuel tank, and a canister internal pressure sensor that detects an internal pressure of the canister, a controller programmed to change an axial distance between the valve element and the valve seat in a state where the cut-off valve cuts off the communication between the canister and the atmosphere and to learn a valve opening start position of the sealing valve based on changes in the internal pressures of the fuel tank and the canister depending on a change in the axial distance.

When high-pressure purge (the first purge control) (d-f) in which fuel evaporative gas in the fuel tank is emitted until internal pressure in the fuel tank decreases to a second predetermined pressure by closing a vapor solenoid valve, opening a fuel tank shutoff valve and a purge control valve when an engine is running finishes, connecting passage purge (the second purge control) (f-g) in which the fuel evaporative gas in vapor piping and purge piping is emitted up to a second predetermined volume (a second predetermined value) or above is performed, and then the fuel evaporative gas in a canister is emitted by opening the vapor solenoid valve (the third purge control) (g-h).

A method for operating a drive system of a motor vehicle having a combustion engine, a fuel tank, and an evaporative emission control system, includes the following steps: opening a canister-purge valve of the evaporative emission control system; using a first sensor of the motor vehicle designed as a pressure sensor to ascertain an evaporative emission control system pressure prevailing in the evaporative emission control system between a filter device of the evaporative emission control system and the canister-purge valve; using a measurement device of the motor vehicle to ascertain an ambient pressure of the motor vehicle; using a computational device of the motor vehicle to compute a flow volume of a fluid streaming through the canister-purge valve on the basis of the ascertained evaporative emission control system pressure and the ascertained ambient pressure; and using an engine control device of the drive system of the motor vehicle to operate the drive system taking into account the computed fluid flow volume.

A method for operating a hybrid vehicle, wherein the hybrid vehicle has an electric engine, an electric traction energy accumulator interacting with the electric engine, an internal combustion engine, and a fuel tank interacting with the internal combustion engine, includes starting from a purely electric driving mode in which the internal combustion engine is shut down and in which a shut-off valve of the fuel tank is closed, opening the shut-off valve of the fuel tank and starting up the internal combustion engine depending on defined operating conditions. The defined operating conditions include a current charging state of the traction energy accumulator and a current pressure in the fuel tank.