Working principle and function of secondary air injection system

Working principle of secondary air injection system:

When the engine is working, the air pump is driven by the crankshaft drive belt, and the air flow with large pumping volume and low pressure enters the diverter valve through the hose. Under normal circumstances, the valve on the diverter valve is open, and the air flows through the diverter valve and the one-way valve into the air injection manifold. The air injection manifold sprays the air flow into the engine exhaust hole or exhaust manifold, reacts with HC and CO in the exhaust, and further converts it into CO2 and water vapor to reduce exhaust pollution. Once the air pressure pumped by the air pump is too high, the pressure relief valve will work, instantly cutting off the air supply to the air injection manifold to prevent the engine from backfire. After a few seconds, the two-way valve falls and resumes the supply of air to the air injection manifold, and the secondary air injection system works normally.

Function of secondary air injection system:

The function of the secondary air injection system is to send fresh air into the engine exhaust pipe to promote the further oxidation of incompletely burned HC and CO in the exhaust gas, thereby reducing the emission of harmful substances in the exhaust gas. This system is widely used in cars, internal combustion locomotives, special-purpose vehicles, etc. The secondary air injection system can be divided into two types: air pump type and pulse type. The air pump type system delivers fresh air into the exhaust pipe through an air pump, while the pulse type system delivers fresh air through negative pressure pulses in the exhaust pipe. The air pump in the air pump type system is driven by the engine, while the air pump in the pulse type system is controlled by a solenoid valve. The secondary air injection system can prevent the occurrence of “backfire” when the engine is cold started, thereby reducing the emission of harmful substances in the exhaust gas.

Working principle of the secondary air injection system: The air pump delivers fresh air into the exhaust pipe and mixes it with the exhaust gas in the exhaust, so that the incompletely burned HC and CO in the exhaust gas are further oxidized, thereby reducing the emission of harmful substances in the exhaust gas. There are two ways to connect the air pump and the diverter valve of the secondary air injection system: bolt connection and hose connection. The working principles of the air pump and the diverter valve are different. The air pump is responsible for delivering fresh air into the exhaust manifold or the exhaust hole near the exhaust valve, while the function of the diverter valve is to prevent fresh air from returning to the air pump, thereby preventing the occurrence of “backfire”. The function of the secondary air injection system is to reduce the emission of harmful substances in the exhaust gas.

Classification of secondary air injection systems: air pump type and pulse type. The air pump in the air pump type system is integrated with the air filter and the air injection manifold, while the air pump in the pulse type system is integrated with the air filter, exhaust manifold, etc. The air pump of the air injection system is controlled by the engine control unit to pump air into the exhaust manifold or the exhaust hole near the exhaust valve to achieve further oxidation of the exhaust gas.

The function of the secondary air injection system is to send fresh air into the exhaust pipe to reduce the emission of harmful substances in the exhaust gas. The system is divided into air pump type and pulse type according to the working conditions. The air pump type system pumps air into the exhaust pipe, while the pulse type system sends air into the exhaust valve area in the exhaust manifold to further oxidize the incompletely burned HC and CO in the exhaust gas. The function of the secondary air injection system is to further reduce the emission of harmful substances in the exhaust gas, improve emission standards, reduce emission pollution, and improve emission efficiency.

The working principle of the secondary air injection system: the air pump sends fresh air into the exhaust manifold, mixes with the exhaust gas in the exhaust, and further oxidizes the incompletely burned HC and CO in the exhaust gas, thereby reducing the emission of harmful substances in the exhaust gas. The air pump in the air injection manifold sends fresh air into the exhaust manifold to promote the full combustion of the exhaust gas in the exhaust gas and reduce the emission of harmful gases.

The working principle of the secondary air injection system: the air pump sends fresh air into the exhaust pipe, and further oxidizes CO and HC in the exhaust gas, reducing the emission of harmful substances in the exhaust gas. The system is divided into air pump type and pulse type according to the working conditions. The air pump is responsible for sending fresh air into the exhaust pipe, while the pulse type system is responsible for sending air into the exhaust manifold.

The function of the secondary air injection system is to further oxidize CO and HC in the exhaust, reduce the emission of harmful substances in the exhaust gas, improve emission efficiency, and reduce pollution. The system can be applied to automobile engines, internal combustion locomotives, special vehicles, industrial vehicles, etc.

If you have the need to purchase secondary air injection, it is recommended that you choose OSIAS, OSIAS will give you professional guidance and services.