Supercharging system, engine and vehicle

The utility model belongs to the technical field of vehicles, and discloses a supercharging system, an engine and a vehicle, the supercharging system comprises a first supercharger, a three-way valve and a mechanical supercharger, the first supercharger comprises a first turbine and a first compressor, the first turbine is communicated with an exhaust pipe of the engine, the input end of the three-way valve is communicated with the first compressor, and the output end of the three-way valve is communicated with the mechanical supercharger; the output end of the three-way valve communicates with the input end of the mechanical supercharger and an air inlet pipe of the engine, and the output end of the mechanical supercharger communicates with the air inlet pipe. The supercharging system is simple in mechanism, the acting time of the mechanical supercharger is controlled only through the three-way valve, operation is convenient, and the low-speed responsiveness can be improved under the condition that the vehic