Methods and systems are provided for identifying misfueling of a vehicle fuel tank with a fuel that is not of a correct type for the vehicle being refueled. In one example, and method may include routing fuel vapors from a vehicle fuel tank to a fuel vapor storage canister during a refueling operation, and responsive to an indication of misfueling, where the indication of misfueling includes a monitored pressure in the fuel tank below a misfueling pressure threshold, and where the misfueling pressure threshold is adjusted as a function of expected pressure in the tank during refueling, actively terminating the refueling event. In this way, addition of an incorrect fuel type to a vehicle fuel tank may be indicated prior to completion of refueling, which may thus alert a vehicle operator of the misfueling, and which may prevent further complications arising from operating the vehicle with an incorrect fuel type.

A control device of the present invention is applied to a hybrid vehicle having an internal combustion engine which is enabled to operate with fuels different in alcohol density from each other. In a case that fueling which causes change of alcohol density of fuel is implemented to the hybrid vehicle, the control device prohibits an intermittent stop of the internal combustion engine until fuel having an alcohol density changed by the fueling is supplied to the internal combustion engine.

A working vehicle according to the present invention is configured with a fuel tank, a fuel sensor for detecting an amount of fuel stored in the fuel tank, and an informing device (a controller, informing switch, and speaker) for informing the stored amount of fuel detected by the fuel sensor, by changing the informing pattern in response to this stored amount of fuel. The working vehicle is also configured with an exhaust gas purification system for purifying exhaust gas using urea water, a urea water tank, a urea water sensor for detecting the amount of urea water stored in the urea water tank, and an informing device (the controller, informing switch, and speaker) for informing a stored amount of urea water detected by the urea water sensor, by changing the informing pattern in response to this stored amount of urea water.

The current invention is a method of regulating the use of cnFuels-CO2 Neutral Fuels (cnFuels)in regulated compatible cnVehicles, comprising preventing an cnVehicle from being fueled with petFuel, and/or preventing an cnVehicle from being fueled from a HEFA based biofuel or from petroleum-based fuel. Physical means comprises physical incompatibility between a petFuel pump nozzle and an cnVehicle fuel inlet, where physical incompatibility comprises at least one of different shape; size; taper; curvature; plugs; and/or locks. Electronic means of preventing an cnVehicle from being fueled with petFuel comprises detecting at least one of: a petFuel pump; a petFuel pump nozzle; a petFuel station, a petFuel supplier data system, an cnFuel pump; an cnFuel pump nozzle; an cnFuel station, an cnFuel supplier data system, an electronic communication identifying an cnVehicle; an electronic communication identifying an cnVehicle operator; and/or an electronic communication identifying an cnFuel user.

A method is provided for operating a first motor vehicle, at least one characteristic relevant to the operation of the first motor vehicle being ascertained and at least one component of the first motor vehicle being actuated on the basis of the at least one characteristic. The at least one characteristic is ascertained in at least one second motor vehicle. An arrangement for implementing such a method is also provided.

A tank system of a motor vehicle includes a volume modifying element, having a compensation volume, which is provided in the inner chamber of the fuel tank and which is used to equalize the vapor pressure. The compensation volume is connected to the surrounding area. The only connection between the volume modifying element and the surrounding area is formed by a storage unit of the gaseous fuel components and the inner chamber of the fuel tank is connected to the surrounding area by a valve unit. The valve unit is normally open when filling the fuel tank and when exceeding or falling below the pressure limits in the inner chamber of the tank, and is otherwise closed. The storage unit is connected to the valve unit. The volume modifying element and the valve unit are designed in such a way that vehicles which are parked for several days do not undergo diurnal losses due to changes in temperature of the surroundings, due to the fact that the vapor pressure equilibrium in the fuel tank can be maintained by the automatic supply and removal of ambient air in the, or from the, volume modifying element as long as the valve unit remains closed.

Methods and systems are provided for a fuel system in a hybrid vehicle. In one example, a method includes activating a fuel pump in a fuel tank included in the hybrid vehicle responsive to a refueling event with a level of residual fuel higher than a fill threshold. By activating the fuel pump, residual fuel in the fuel tank is mixed with newly received fuel in the refueling event enabling improved combustion in a subsequent engine-on condition.

A working vehicle according to the present invention is configured with a fuel tank, a fuel sensor for detecting an amount of fuel stored in the fuel tank, and an informing device (a controller, informing switch, and speaker) for informing the stored amount of fuel detected by the fuel sensor, by changing the informing pattern in response to this stored amount of fuel. The working vehicle is also configured with an exhaust gas purification system for purifying exhaust gas using urea water, a urea water tank, a urea water sensor for detecting the amount of urea water stored in the urea water tank, and an informing device (the controller, informing switch, and speaker) for informing a stored amount of urea water detected by the urea water sensor, by changing the informing pattern in response to this stored amount of urea water.

A method for a fuel system, comprising: monitoring a fuel tank pressure during a refueling event; determining a fuel flow rate based on a steady-state portion of the monitored fuel tank pressure; and indicating an amount of fuel added to a fuel tank based on the fuel flow rate. In this way, a fuel tank fill level can be determined following a refueling event, even in a scenario where the fuel level indicator is stuck or malfunctioning.

A sensor device 1 includes a fuel property sensor 5 configured capable of detecting a property of fuel that is ejected from a fuel pump 4 in a feel tank 2; a guiding line 12 configured to guide fuel ejected from the fuel pump 4 to the fuel property sensor 5; and a relief valve 21 configured to allow fuel to flow out of the guiding line 12 when a pressure of fuel in the guiding 12 becomes equal to or higher than a predetermined pressure.