초록 ▼

A control system is provided for regulating the fuel feed to a dual fuel internal combustion engine. The engine includes a source of first fuel, a pump therefor, and a source of second fuel under a predetermined pressure. A first valve is mounted within a first feed line connecting the engine to the

A control system is provided for regulating the fuel feed to a dual fuel internal combustion engine. The engine includes a source of first fuel, a pump therefor, and a source of second fuel under a predetermined pressure. A first valve is mounted within a first feed line connecting the engine to the pump outlet. A second valve is mounted within a second feed line connecting the engine to the pump outlet. A third valve is mounted within a third feed line connecting the engine to the second fuel source. A pressure-sensitive metering valve is disposed within the third feed line downstream of the third valve. A means is provided which transmits the flow pressure from the second valve to the metering valve and thus, determines the setting of the latter. A control means, adjustable between two modes, is operatively connected to the first, second, and third valves. When the control means is in a first mode, the first valve is open and both the second and third valves are closed whereby only the first fuel is fed to the engine. When the control means is in a second mode, the first valve is closed and both the second and third valves are open whereby both the first and second fuels are simultaneously fed to the engine. The ratio of the second fuel to the first fuel being fed to the engine, when the control means is in the second mode, is determined by the setting of the metering valve when said control means is in said second mode.

대표청구항 ▼

A control system for a dual fuel internal combustion engine, the latter having a first fuel source and a second fuel source under a predetermined pressure, said system comprising: primary means for metering fuel to the engine from the first fuel source as a function of engine load and operator deman

A control system for a dual fuel internal combustion engine, the latter having a first fuel source and a second fuel source under a predetermined pressure, said system comprising: primary means for metering fuel to the engine from the first fuel source as a function of engine load and operator demand; means for generating a control signal as a function of engine load; means for metering fuel from the second fuel source to the engine as a function of said control signal whenever it is desired to operate the engine in a dual fuel mode; and means responsive to operation of the engine in a dual fuel mode for modulating the fuel metered by said primary metering means by an amount which provides substantially the same fuel energy content delivered to the engine in the dual fuel mode as in the single fuel mode; said primary fuel metering means including a variable speed fuel pump, and a first feed line for connecting said pump to the engine, and said modulating means including means disposed in said first feed line for restricting flow a predetermined amount only when the engine is operating in the dual feed mode.