초록 ▼

A bi-fuel injection system includes a source of first liquid fuel; a source of second liquid fuel; at least one variable vapor pressure fuel injector; a common fuel rail for supplying first or second fuels to the fuel injector; a first valve structure in selective communication with the source of fi

A bi-fuel injection system includes a source of first liquid fuel; a source of second liquid fuel; at least one variable vapor pressure fuel injector; a common fuel rail for supplying first or second fuels to the fuel injector; a first valve structure in selective communication with the source of first or second fuels and in communication with an inlet of the fuel rail to selectively control supply of one of the first and second fuels to the fuel rail; and a second valve structure in communication with an outlet of the fuel rail and in selective communication with the source of first or second fuels to return fuel exiting the fuel rail to the source of first or second fuels. The second valve structure may be in selective communication with a vapor purge system to receive fuel vapors exiting the fuel rail. The first and second valve structures are selectively controllable (1) to permit residual first fuel to be purged from the fuel rail into one of the sources of first and second fuels when supplying the second fuel to the fuel rail, and (2) to permit residual second fuel to be purged from the fuel rail into the vapor purge system or one of the sources of first and second fuels when supplying the first fuel to the fuel rail.

대표청구항 ▼

[ What is claimed is:] [1.] A bi-fuel, variable vapor pressure injection system for an internal combustion engine, comprising:a source of first liquid fuel;a source of second liquid fuel;at least one variable vapor pressure fuel injector;a common fuel rail for supplying one of said first and second

[ What is claimed is:] [1.] A bi-fuel, variable vapor pressure injection system for an internal combustion engine, comprising:a source of first liquid fuel;a source of second liquid fuel;at least one variable vapor pressure fuel injector;a common fuel rail for supplying one of said first and second fuels to said at least one fuel injector;a first valve structure in selective communication with each of said sources of said first and second fuels and in communication with an inlet of said fuel rail to selectively control supply of one of said first and second fuels to said fuel rail; anda second valve structure in communication with an outlet of said fuel rail and in selective communication with said source of second fuel to return fuel exiting said fuel rail to said source of second fuel, said second valve structure being in selective communication with a vapor purge system to receive fuel vapors exiting said fuel rail,said first and second valve structures being selectively controllable (1) to permit residual first fuel to be purged from said fuel rail into said source of second fuel when supplying said second fuel to said fuel rail, and (2) to permit residual second fuel to be purged from said fuel rail into said vapor purge system when supplying said first fuel to said fuel rail.