Control system for exhaust system of diesel engine

The invention discloses a control system for an exhaust system of a diesel engine. The control method comprises a first judging step, a second judging step, a first control step and a second control step, wherein the first judging step refers to judging whether a particle catcher is in a working state or not, and entering the second judging step if the particle catcher is in the working state; thesecond judging step refers to judging real-time accelerator opening, comparing the real-time accelerator opening with a standard opening, entering the first control step if the real-time acceleratoropening is greater than or equal to the standard opening, and entering the second control step if the real-time accelerator opening is smaller than the standard opening; the first control step refersto keeping a current working condition state; and the second control step refers to closing a gas path control valve of a gas inlet pipeline, and opening a circulating control valve of a gas exhaust recirculating branch. Accord