Fuel supply system for internal combustion engine

摘要

An engine includes a normal fuel tank, fuel gas tank, an in-tank injection valve and a fuel gas supply valve. During operation of the engine, in a state where the fuel gas supply valve is closed, a fuel is injected into the fuel gas tank through the in-tank injection valve to generate a fuel gas by vaporizing the fuel. The fuel gas is stored in the fuel gas tank and is maintained in the gas phase due to the natural decompression even after the engine is stopped. To start the engine, the fuel gas supply valve is opened to supply the fuel gas in the fuel gas tank to a surge tank. Thus, compared with the case where the fuel gas is generated at the start of the engine, the fuel gas can be quickly supplied into the cylinder, so that the ability to start the engine is improved.

主权项

1. A fuel supply system for an internal combustion engine, comprising:
a fuel tank that stores a fuel; a fuel injection valve through which the fuel in said fuel tank is injected into an intake air channel and/or a combustion chamber; a fuel gas tank that is connected to said intake air channel and stores a fuel gas generated by vaporizing said fuel; an in-tank fuel supplying means of supplying the fuel in said fuel tank to said fuel gas tank in order to generate the fuel gas in said fuel gas tank; a fuel gas supply valve that is a normally closed valve that opens and closes a connection between said fuel gas tank and said intake air channel and is opened at the start of the internal combustion engine; generation controlling means of driving said in-tank fuel supplying means during operation of the internal combustion engine in a state where said fuel gas supply valve is closed to generate the fuel gas in said fuel gas tank; and supply controlling means of opening said fuel gas supply valve at the start of the internal combustion engine to supply the fuel gas stored in said fuel gas tank to said intake air channel during operation of the internal combustion engine.