Patent ID: 6901747

Claim:
A diesel engine fuel injection control method for performing a pilot injection and a main injection by controlling the fuel injection of a diesel engine, and for performing at least one engine fuel combustion among retard of said main injection or increased/decreased of the injection quantity, for at least one of rising of diesel engine exhaust gas temperature and decrease of the oxygen concentration in the exhaust gas, wherein the injection quantity of said pilot injection is increased/decreased, in accordance with the increase/decrease at least one of retard amount and injection quantity of said main injection, wherein said injection quantity of said pilot injection is increased/decreased based on the output value of a fuel combustion state detection means, including an ion gap sensor, all the way monitoring the fuel combustion state in the cylinder by the fuel combustion state detection means, when at least one of said retard amount and said injection quantity of said main injection shall be increased/decreased.