Patent ID: 8175788
Filing Date: 2012-05-08
Classification: B01D,F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A control unit of a diesel engine that is used in the diesel engine provided with an exhaust fuel addition valve capable of adding fuel from an exhaust passage on an upstream side of an exhaust post-treatment device and is capable of controlling the exhaust fuel addition valve, the control unit comprising: a biofuel concentration estimating unit that estimates biofuel concentration in the fuel; an exhaust temperature obtaining unit that obtains an exhaust temperature in the exhaust passage; and a minimum operating exhaust temperature setting unit that sets a minimum operating exhaust temperature being a lower limit value of the exhaust temperature to permit fuel addition from the exhaust fuel addition valve, wherein the minimum operating exhaust temperature setting unit sets the minimum operating exhaust temperature according to the estimated biofuel concentration.