A control system of an internal combustion engine in which as fuel, a first fuel of ammonia and a second fuel easier to burn than ammonia are used. These two types of fuel are burned in the combustion chamber. A basic ammonia ratio is set in accordance with an engine load and engine speed. The set b
A control system of an internal combustion engine in which as fuel, a first fuel of ammonia and a second fuel easier to burn than ammonia are used. These two types of fuel are burned in the combustion chamber. A basic ammonia ratio is set in accordance with an engine load and engine speed. The set basic ammonia ratio is corrected based on at least one of a combustion state, knocking strength, temperature of an exhaust gas or temperature of a catalyst arranged in an engine exhaust passage, NOx concentration in the exhaust gas, actual compression ratio, air-fuel ratio, and fuel properties.
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1. A control system of an internal combustion engine using a first fuel of ammonia and a second fuel which is easier to burn than ammonia as fuel and feeding these two types of fuel into a combustion chamber to burn the fuel in the combustion chamber, wherein a basic ammonia ratio indicating a ratio
1. A control system of an internal combustion engine using a first fuel of ammonia and a second fuel which is easier to burn than ammonia as fuel and feeding these two types of fuel into a combustion chamber to burn the fuel in the combustion chamber, wherein a basic ammonia ratio indicating a ratio of an amount of ammonia fed with respect to a total amount of fuel fed in accordance with an engine load and an engine speed is set, and the set basic ammonia ratio is corrected based on at least one of a combustion state, knocking strength, temperature of an exhaust gas or temperature of a catalyst arranged in an engine exhaust passage, NOx concentration in the exhaust gas, actual compression ratio, air-fuel ratio, and fuel properties. 2. A control system of an internal combustion engine as claimed in claim 1, wherein an ammonia ratio is increased if a knocking strength is increased. 3. A control system of an internal combustion engine as claimed in claim 1, wherein an ammonia ratio is lowered when it is determined from the temperature of the exhaust gas or the temperature of the catalyst that the catalyst is not activated. 4. A control system of an internal combustion engine as claimed in claim 1, wherein an ammonia ratio is increased when the NOx concentration in the exhaust gas rises. 5. A control system of an internal combustion engine as claimed in claim 1, wherein a closing timing of an intake valve is controllable, and an ammonia ratio is lowered when the closing timing of the intake valve is retarded and the actual compression ratio falls. 6. A control system of an internal combustion engine as claimed in claim 1, wherein an ammonia ratio is lowered the leaner the air-fuel ratio. 7. A control system of an internal combustion engine as claimed in claim 1, wherein a target air-fuel ratio is preset, a feed amount of said second fuel is controlled so that an air-fuel ratio becomes the target air-fuel ratio, and the ammonia ratio is changed along with this. 8. A control system of an internal combustion engine as claimed in claim 1, wherein a target air-fuel ratio is preset, a feed amount of ammonia is controlled so that an air-fuel ratio becomes the target air-fuel ratio, and the ammonia ratio is changed along with this. 9. A control system of an internal combustion engine as claimed in claim 1, wherein fuel injectors for injecting said second fuel are arranged in an engine intake passage and combustion chamber, and a ratio of the amount of feed of the second fuel to the engine intake passage to the total amount of feed of the second fuel is increased the greater the total amount of feed of the second fuel. 10. A control system of an internal combustion engine as claimed in claim 1, wherein said combustion state is a combustion rate, and an ammonia ratio is increased the faster the combustion rate. 11. A control system of an internal combustion engine as claimed in claim 10, wherein the ammonia ratio is increased the higher a water temperature, intake temperature, or oil temperature or the lower a humidity of an intake air. 12. A control system of an internal combustion engine as claimed in claim 1, wherein said combustion state is a combustion fluctuation, and an ammonia ratio is lowered the greater the combustion fluctuation. 13. A control system of an internal combustion engine as claimed in claim 12, wherein the ammonia ratio is lowered the greater an amount of fluctuation of a combustion pressure or amount of fluctuation of an engine output torque. 14. A control system of an internal combustion engine as claimed in claim 1, wherein an ammonia ratio is increased when it is determined from the temperature of the exhaust gas or the temperature of the catalyst that the temperature of the catalyst should be lowered. 15. A control system of an internal combustion engine as claimed in claim 14, wherein an ammonia ratio is decreased when it is determined from the temperature of the exhaust gas or the temperature of the catalyst that the temperature of the catalyst should be raised.
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