초록 ▼

An internal combustion engine operable on two kinds of fuel properly selected according to engine operating conditions. A control system is provided which controls the total amount of fuel supplied to the engine in response to intake air flow and controls the ratio between the amounts of the two kin

An internal combustion engine operable on two kinds of fuel properly selected according to engine operating conditions. A control system is provided which controls the total amount of fuel supplied to the engine in response to intake air flow and controls the ratio between the amounts of the two kinds of fuel supplied to the engine in response to engine load.

대표청구항 ▼

In an internal combustion engine including an intake passage, a first fuel injector for discharging, into said intake passage, a first kind of fuel having a first calorific value, a second fuel injector for discharging, into said intake passage, a second kind of fuel having a second calorific value

In an internal combustion engine including an intake passage, a first fuel injector for discharging, into said intake passage, a first kind of fuel having a first calorific value, a second fuel injector for discharging, into said intake passage, a second kind of fuel having a second calorific value different from said first calorific value of said first kind of fuel, said first and second fuel injectors being repeatedly energized to discharge fuel for time periods corresponding to pulse widths of first and second injection command signals applied thereto, respectively, a method controlling the amounts of said first and second kinds of fuel discharged into said intake passage comprising the steps of: determining a basic pulse width of said first injection command signal to provide a quantity of said first kind of fuel having said first calorific value required for said engine in response to air flow rate to said engine; determining a ratio between the pulse widths of said first and second injection command signals in response to engine load; determining the pulse widths of said first and second injection command signals from the determined basic pulse width and the determined pulse width ratio; and operating said first and second fuel injectors in response to said first and second injection command signals having the predetermined pulse widths, respectively, so that the total of the caloric values of said first and second kinds of fuel discharged corresponds to the caloric value of said quantity of said first kind of fuel corresponding to the determined pulse width of said first injection command signal.