Patent ID: 6161519
Filing Date: 2000-12-19
Classification: F02B,F02D,Y02T

Abstract:
A diesel engine provided with an exhaust gas recirculation system which performs low temperature pre-mixed combustion at a low compression ratio, said diesel engine comprisinga fuel injection valve which varies a fuel injection timing,a temperature increase control device which raises an operational gas temperature in a combustion chamber, anda control unit which controls said fuel injection valve and said temperature increase control device, wherein said control unitestimates an ambient temperature in a cylinder at initiation of combustion,decides whether or not said ambient temperature in a cylinder at initiation of combustion is in a region lower than a first target temperature which maintains low temperature pre-mixed combustion,performs temperature increase control by operating said temperature increase control device so that an ambient temperature at initiation of combustion exceeds a first target temperature, when it is determined that said ambient temperature at initiation of combustion is in a region which is lower than said first target temperature andregulates a fuel injection timing of said fuel injection valve so that a combustion temperature increase rate is more than a fixed value.