POST-TREATMENT SYSTEM, METHOD FOR CONTROLLING POST-TREATMENT SYSTEM, AND VEHICLE

Provided is a post-treatment system. The post-treatment system comprises two SCRs, wherein a second SCR is connected to a booster in parallel, and a three-way valve is arranged before the second SCR and the booster, such that whether an exhaust gas flows through the second SCR or the booster is controlled by means of controlling the three-way valve. In the case of a low temperature, the three-way valve is controlled to close a branch of the booster, such that the exhaust gas flows through the second SCR and a first SCR that are connected in series, thereby reducing the energy loss caused by the exhaust gas flowing through the booster, and improving the NOx conversion efficiency in the case of a low temperature. In a case of a high temperature, the three-way valve is controlled to close a by-pass line, such that the exhaust gas flows through the booster and the first SCR, thereby reducing the heat capacity and the backpressure of the post-temperature system, and reducing the influence of the post-treatment on the engine performance. Also provided are a method for controlling a post-treatment system, and a vehicle having the system.