Patent ID: 6886334

Claim:
A combustion control device of a diesel engine, the diesel engine performing combustion of a mixture of a fuel and an aspirated gas, the device comprising: a mechanism which regulates an oxygen concentration of the aspirated gas based on a target oxygen concentration and an oxygen amount of the aspirated gas based on a target oxygen amount; a sensor which detects a running state of the diesel engine; and a programmable controller programmed to: select any one of a diffusive combustion and a premixed combustion with respect to the combustion of the mixture based on the running state of the diesel engine; calculate, when the diffusive combustion is selected, the target oxygen concentration and the target oxygen amount adapted for the diffusive combustion based on the running state of the diesel engine; calculate, when the premixed combustion is selected, the target oxygen concentration and the target oxygen amount adapted for the premixed combustion based on the running state of the diesel engine; and control the regulating mechanism to immediately shift the target oxygen concentration and the target oxygen amount to calculated values; wherein the diesel engine comprises a turbocharger and the regulating mechanism comprises a mechanism which regulates a turbocharging pressure of the turbocharger.