Diesel engine exhaust gas flow statistical system based on DPF postprocessing control

The invention discloses a diesel engine exhaust gas flow statistical system based on DPF postprocessing control. The diesel engine exhaust gas flow statistical system based on DPF postprocessing control comprises a measuring and obtaining unit, an online observation unit and a calculation unit. Please see the calculation formula of a first pressure drop in the descriptions, wherein u is the fit coefficient constant, alpha and beta are exponent constants, [m-dot] is the exhaust gas mass flow rate, K is the exhaust gas relative reference temperature, and u, alpha and beta are solved and obtainedthrough the least square method. The diesel engine exhaust gas flow statistical system based on DPF postprocessing control solves the problem that the pressure drop of a DPF downstream exhaust pipeline is ignored, an experience pressure drop function model with the exhaust gas mass flow rate and the exhaust gas reference temperature as variables is provided, so that the pressure drop of the DPF downstream exhaust pipelin