Integrated apparatus, exhaust gas post-processing system, and control method

An integrated apparatus of a pump and a nozzle, wherein the pump is used for pumping a fluid medium toward the nozzle, and the nozzle is used for injecting the fluid medium into intake gas or exhaust gas of an engine, characterized in that the integrated apparatus comprises a pump component and a nozzle component;

• the pump component comprises an electric machine casing assembly, a magnetic cover component at least partially located in the electric machine casing assembly, and a pump housing assembly cooperating with the electric machine casing assembly;
• the electric machine casing assembly comprises an electromagnetic shielding cover, and an electric machine coil at least partially located in the electromagnetic shielding cover;
• the magnetic cover component comprises a metal cover at least partially inserted into the electric machine coil, and a rotor received in the metal cover;
• the electric machine casing assembly and the pump housing assembly are fixed together by roll extrusion or welding;
• the pump housing assembly comprises an inlet passage located upstream of the pump and in communication with the pump, and an outlet passage located downstream of the pump and in communication with the pump, wherein the outlet passage is in communication with the nozzle component;
• the pump housing assembly further comprises a first gear component and a second gear component meshed with each other, wherein the first gear component comprises a first gear shaft and a first gear, the second gear component comprises a second gear shaft and a second gear, the first gear and the second gear being meshed with each other, and the rotor being fixed to the first gear shaft;
• the nozzle component comprises a nozzle assembly, and a water-cooled base connected in a surrounding manner at the outside of the nozzle assembly, wherein the nozzle assembly comprises a nozzle coil for driving the nozzle.