An apparatus of charging Liquefied Petroleum Gas (LPG) fuel of a bi-fuel vehicle includes: a gasoline mixing chamber mounted on an LPG bombe side, a gasoline fuel supply line connecting the gasoline mixing chamber with a fuel tank and allowing gasoline fuel to move to the gasoline mixing chamber as a first valve is open, an LPG fuel supply line connecting an LPG bombe with the gasoline mixing chamber and allowing LPG fuel to move to the gasoline mixing chamber as a second valve is open, and a control unit configured to open the first valve and control the LPG fuel to be recirculated to the LPG bombe together with the gasoline fuel by a pressure of the LPG fuel moving to the gasoline mixing chamber, as an internal pressure of the LPG bombe reaches a predetermined reference pressure.

An engine operable in a premixed combustion system and a diffusion combustion system. The engine includes a main fuel injection valve, a pilot fuel injection valve, a liquid fuel tank, a main fuel supply path, a pilot fuel supply path, a pilot fuel filter, a pilot fuel high-pressure pump, a pilot fuel tank, and a pilot fuel supply pump. The pilot fuel tank stores pilot fuel sent from the pilot fuel high-pressure pump and not injected by the pilot fuel injection valve. This pilot fuel is sent to an automatic backwash filter and a pilot fuel filter while not passing through the liquid fuel tank.

A control system and method for a multi-fuel generator engine are mainly applied to multi-fuel generator products. The control system comprises a controller, a first signal input terminal, a second signal input terminal, a third signal input terminal, and an output terminal connected to an ignition device of a generator engine. When the third signal input terminal of the controller receives a generator engine start signal and either the first signal input terminal or the second signal input terminal receives a signal corresponding to an on state of the corresponding valve assembly, the controller controls the ignition device to ignite. According to control system and method, the controller detects signals corresponding to the states of the two fuel valve assemblies to determine whether or not fuels are normally supplied, so that operating instabilities or faults caused by synchronous supply of two fuels to the generator engine are avoided.

A system includes a combustion apparatus for controlling combustion of a fuel and air in a combustion chamber to produce mechanical motion, a source of a chemical species for supplying a chemical species to be mixed with the fuel and air, a control valve for controlling an amount of the chemical species that is introduced from the source into the fuel and the air, and a controller in communication with the control valve to cause the control valve to introduce the chemical species at a flow rate that will cause auto-ignition of combustion between the fuel and the air in the combustion chamber without use of a spark-producing device. The controller may perform operations embodied as program instructions for controlling the system.

A fuel separation system includes a fuel separator configured to receive a fuel stream and separate the fuel stream, based on a volatility of the fuel stream, into a vapor stream defined by a first auto-ignition characteristic value and a first liquid stream defined by a second auto-ignition characteristic value, the second auto-ignition characteristic value greater than the first auto-ignition characteristic value; and a heat exchanger fluidly coupled between a fuel input of the fuel stream and the fuel separator, the heat exchanger configured to transfer heat from the vapor stream to the fuel stream, and output a heated fuel stream to the fuel separator and a second liquid stream defined by the first auto-ignition characteristic value.

Systems and methods for operating a fuel system that includes two separate fuel tanks are disclosed. In one example, fuel may be purged from a fuel rail in response to Reid vapor pressure of a fuel so that engine starting may be improved. A fuel with a higher Reid vapor pressure may be pumped into the fuel rail when the engine is expected to be cold started.

A supplemental fuel system includes a supplemental fuel tank, an electronic lock off valve, a temperature sensor, and a controller. The supplemental fuel tank is configured to store a supplemental fuel. The supplemental fuel is configured to supplement a primary fuel used by an engine. The electronic lock off valve is configured to be positioned between the supplemental fuel tank and an air supply system for the engine. The temperature sensor is configured to acquire temperature data regarding a temperature of exhaust gas output by the engine. The controller is configured to control the electronic lock off valve such that the electronic lock off valve is (i) closed in response to the temperature being greater than a temperature threshold and (ii) open or openable in response to the temperature being less than the temperature threshold.

A control system and method for a multi-fuel generator engine are mainly applied to multi-fuel generator products. The control system comprises a controller, a first signal input terminal, a second signal input terminal, a third signal input terminal, and an output terminal connected to an ignition device of a generator engine. When the third signal input terminal of the controller receives a generator engine start signal and either the first signal input terminal or the second signal input terminal receives a signal corresponding to an on state of the corresponding valve assembly, the controller controls the ignition device to ignite. According to control system and method, the controller detects signals corresponding to the states of the two fuel valve assemblies to determine whether or not fuels are normally supplied, so that operating instabilities or faults caused by synchronous supply of two fuels to the generator engine are avoided.

An engine operable in a premixed combustion system and a diffusion combustion system. The engine includes a main fuel injection valve, a pilot fuel injection valve, a liquid fuel tank, a main fuel supply path, a pilot fuel supply path, a pilot fuel filter, a pilot fuel high-pressure pump, a pilot fuel tank, and a pilot fuel supply pump. The pilot fuel tank stores pilot fuel sent from the pilot fuel high-pressure pump and not injected by the pilot fuel injection valve. This pilot fuel is sent to an automatic backwash filter and a pilot fuel filter while not passing through the liquid fuel tank.

Fuel management system for enhanced operation of a spark ignition gasoline engine. Injectors inject an anti-knock agent such as ethanol directly into a cylinder. It is preferred that the direct injection occur after the inlet valve is closed. It is also preferred that stoichiometric operation with a three way catalyst be used to minimize emissions. In addition, it is also preferred that the anti-knock agents have a heat of vaporization per unit of combustion energy that is at least three times that of gasoline.