Study on the Exhaust Back-pressure Threshold-value MAP for the Diesel Particulate Filter Regeneration

The back-pressure gradually rises with the increasing particulate sediment during the diesel particulate filter (DPF) working. it will be harmful to the fuel economy of diesel engine. In order to keep the good fuel economy, when the back-pressure exceeds the set threshold-value, the sediment particulate must be cleaned in DPF namely regeneration, therefore, the exhaust back-pressure threshold-value for every working condition is pivotal to the DPF regeneration time. Taking the burner-type DPF as an example, through the real-time measure data of the diesel engine rotate speed, load, corresponding fuel consumption and DPF exhaust back-pressure, with the data processing method and the diesel engine fuel consumption ratio mode based on the multiple regression theory, taking advantage of MATLAB mighty function in mathematic operation and figure disposal, the fuel consumption characteristic map of the diesel engine equipped with DPF is plotted. Further, with the above corresponding test data, the DPF regeneration MAP of exhaust back-pressure threshold-value is obtained.