A fuel selector for use with a dual fuel generator includes a selector plate, a first fuel valve assembly positioned adjacent the selector plate and actuatable between an ON position and an OFF position to selectively control a first fuel flow to an engine of the dual fuel generator, and a second fuel valve assembly positioned adjacent the selector plate and actuatable between an ON position and an OFF position to selectively control a second fuel flow to the engine of the dual fuel generator. A selector switch coupled to the selector plate is linearly translatable from a first position to a second position, so as to enable positioning of only one of the first fuel valve assembly and the second fuel valve assembly in the ON position at a given time, such that the first and second fuel valve assemblies cannot be in the ON position concurrently.

A selective fuel regulator includes: a fuel tank having therein a cold-area-purpose fuel storage unit and a general-purpose fuel storage unit, a cold-area-purpose fuel pipe connected to the cold-area-purpose fuel storage unit, and a general-purpose fuel pipe connected to the general-purpose fuel storage unit; a body installed in the fuel tank, the body having therein a receiving space; a plurality of pipes, one end of each pipe located in the fuel tank, and the other end of each pipe located in the receiving space in order to supply fuel from the fuel tank to an engine or to collect residual fuel from the engine; a fuel port, one end of the fuel port located in the receiving space, and the other end of the fuel port located outside the body in order to connect the plurality of pipes to a fuel line installed outside the fuel tank; and a connector located between the one end of the fuel port and the respective other ends of the plurality of pipes so as to slide between the cold-area-purpose fuel pipe and the general-purpose fuel pipe for selectively supplying fuel from the cold-area-purpose fuel storage unit or from the general-purpose fuel storage unit to the engine.

A method for operating a dual-fuel internal combustion engine, having an intake path and an engine having a number of cylinders. In the method the engine is operated in a first operating state in diesel operation with diesel or another liquid fuel, and in a second operating state in gas operation with gas as fuel in a charge mixture, and switching between diesel operation and gas operation takes place in a switchover range determined, in particular predetermined, by switchover operating parameters.

In an apparatus for controlling an air/fuel ratio of a general-purpose internal combustion engine using mixed fuel containing alcohol and gasoline and operated at a desired engine speed inputted by the operator while a throttle opening is regulated such that a detected engine speed converges to the inputted desired engine speed, a fuel injection amount determined for mixed fuel based on fuel injection amount characteristics is increased/decreased when a load is kept constant and the output air/fuel ratio is estimated to correct the fuel injection amount by the estimated air/fuel ratio, while a switch (knob) is installed to be manipulated by the operator to switch the fuel injection amount characteristics.

A combination control assembly of dual fuel internal combustion engine comprises a dial (2) that can be rotated to manipulate operation of a dual fuel internal combustion engine; a turntable (3) includes a disk body (301) and a shift lever (302), characterized in that the shift lever (302) is settled on the disk body (301); a first rotating part (4) that can be rotated by cooperating with the shift lever (302); a second rotating part (9) that can be rotated by cooperating with the shift lever (302); a first fuel valve (6) opened by the first rotating part (4), a second fuel valve (11) opened by the second rotating part (9). The combination control assembly controls the first fuel valve (6) and the second fuel valve (11), simplifying the manual operation and keeping the engine runs stable.

A selective fuel regulator includes: a fuel tank having therein a cold-area-purpose fuel storage unit and a general-purpose fuel storage unit, a cold-area-purpose fuel pipe connected to the cold-area-purpose fuel storage unit, and a general-purpose fuel pipe connected to the general-purpose fuel storage unit; a body installed in the fuel tank, the body having therein a receiving space; a plurality of pipes, one end of each pipe located in the fuel tank, and the other end of each pipe located in the receiving space in order to supply fuel from the fuel tank to an engine or to collect residual fuel from the engine; a fuel port, one end of the fuel port located in the receiving space, and the other end of the fuel port located outside the body in order to connect the plurality of pipes to a fuel line installed outside the fuel tank; and a connector located between the one end of the fuel port and the respective other ends of the plurality of pipes so as to slide between the cold-area-purpose fuel pipe and the general-purpose fuel pipe for selectively supplying fuel from the cold-area-purpose fuel storage unit or from the general-purpose fuel storage unit to the engine.

A mechanical fuel lockout switch for a dual fuel engine includes a mechanical fuel valve actuatable between a first position and a second position to selectively control fuel flow to the dual fuel engine from a first fuel source through a first fuel line and a second fuel source through a second fuel line. The mechanical fuel lockout switch also includes a fuel lockout apparatus coupled to the mechanical fuel valve. The mechanical fuel lockout switch communicates the first fuel source to the dual fuel engine and prevents communication between the second fuel source and the dual fuel engine when the mechanical fuel valve is in the first position, and communicates the second fuel source to the dual fuel engine and interrupts the first fuel source communication with the dual fuel engine when in the second position.

A mechanical fuel lockout switch for a dual fuel engine includes a mechanical fuel valve actuateable between a first position and a second position to selectively control fuel flow to the dual fuel engine from a first fuel source through a first fuel line and a second fuel source through a second fuel line. The mechanical fuel lockout switch also includes a fuel lockout apparatus coupled to the mechanical fuel valve. The mechanical fuel lockout switch communicates the first fuel source to the dual fuel engine and prevents communication between the second fuel source and the dual fuel engine when the mechanical fuel valve is in the first position, and communicates the second fuel source to the dual fuel engine and interrupts the first fuel source communication with the dual fuel engine when in the second position.

In a dual-fuel fuel injector comprising a first injector unit for a first injector operating mode using a first main fuel and a second injector unit for a second injector operating mode using a second main fuel and an injector-reservoir, the reservoir is connected at one end to a first main fuel supply and at the opposite end to a second main fuel supply with a separating element disposed in the injector reservoir so as to be movable between the opposite ends so that, in each operating mode, the full volume of the reservoir can be used for accommodating the respective main fuel.

A dual-fuel internal combustion engine with at least one combustion chamber, wherein the at least one combustion chamber is assigned to an intake valve for a gas-air mixture and an injector (I1 to I4) for liquid fuel, and a control device, which is designed in a switch-over mode to perform a switch-over, that an amount of energy supplied to the at least one combustion chamber through the gas-air mixture is changed, and a supplied amount of liquid fuel and/or a time of the injection of the liquid fuel is changed, and a combustion sensor whose signals are characteristic for the combustion process occurring in the at least one combustion chamber, wherein the control device is designed to carry out the switch-over using a stored relationship between a time progression of the signals of the combustion sensor and an introduced amount of gas-air mixture.