Exhaust gas recirculation system, engine assembly, and vehicle

An engine assembly, comprising:

• an engine having an air inlet manifold and an exhaust manifold;
• and
• an exhaust gas recirculation system, comprising:
• an air inlet pipe having an air inlet, an air supply port, and an air return port, the air inlet configured to be in communication with air;
• the air supply port configured to be in communication with the air inlet manifold of the engine;
• and in a length direction of the air inlet pipe, the air return port located between the air inlet and the air supply port;
• an air inlet control valve disposed on the air inlet pipe, and located between the air inlet and the air return port;
• an air filter disposed on the air inlet pipe, and located between the air inlet and the air inlet control valve;
• an exhaust gas return pipe being in communication with the air return port;
• an exhaust pipe being in communication with the exhaust gas return pipe, and configured to be in communication with the exhaust manifold of the engine, wherein in the length direction of the air inlet pipe, a distance S between the air return port and the air inlet control valve and an inner diameter D of the air inlet pipe are configured to meet S/D≤2;
• a pressurizer having a first end and a second end, wherein in the length direction of the air inlet pipe, the inner diameter D and a distance L between the air return port and the second end are configured to meet 2≤L/D≤20;
• and
• a catalyst disposed on the exhaust pipe, wherein the catalyst is configured to convert CO, HC, or NOx in an exhaust gas into carbon dioxide, water, or nitrogen.

A vehicle, comprising an engine assembly comprising:

• an engine having an air inlet manifold and an exhaust manifold;
• and
• an exhaust gas recirculation system, comprising:
• an air inlet pipe having an air inlet, an air supply port, and an air return port, the air inlet configured to be in communication with air;
• the air supply port configured to be in communication with the air inlet manifold of the engine;
• and in a length direction of the air inlet pipe, the air return port located between the air inlet and the air supply port;
• an air inlet control valve disposed on the air inlet pipe, and located between the air inlet and the air return port;
• an air filter disposed on the air inlet pipe, and located between the air inlet and the air inlet control valve;
• an exhaust gas return pipe being in communication with the air return port;
• and
• an exhaust pipe being in communication with the exhaust gas return pipe, and configured to be in communication with the exhaust manifold of the engine,
• wherein in the length direction of the air inlet pipe, a distance S between the air return port and the air inlet control valve and an inner diameter D of the air inlet pipe are configured to meet S/D≤2;
• a pressurizer having a first end and a second end, wherein in the length direction of the air inlet pipe, the inner diameter D and a distance L between the air return port and the second end are configured to meet 2<L/D≤20;
• and
• a catalyst disposed on the exhaust pipe, wherein the catalyst is configured to convert CO, HC, or NOx in an exhaust gas into carbon dioxide, water, or nitrogen.