How is the EGR valve arranged?

Few people know, but it is thanks to the recirculation of exhaust gases that the fuel consumption of the car can be significantly reduced, the productivity of the motor can be increased, it can be normalized and the level of detonation reduced. There is such a system for a long time, and at the moment it is used absolutely on all vehicles. Even on the domestic "Niva" there is such a device.

Why do we need this system?

Recirculation of exhaust gases is necessary in order that the engine does not lose its power when discharging unburned fuel residues. And it happens as follows. As the temperature in the combustion chamber increases, nitrogen, together with oxygen, begins to form nitric oxides. In a gasoline engine, O2 is needed for efficient combustion of fuel, and since nitrogen reduces its quantity, the liquid does not burn up completely. As a result, gasoline simply flies into the pipe, fuel consumption increases, and at the same time the productivity of the internal combustion engine decreases. The exhaust gas recirculation valve gives the fuel the ability to burn to the end, thereby normalizing the power and fuel consumption in the car.

What is this valve?

In appearance it is a small disk with a tube that connects to the intake manifold and is attached to the cylinder head. In a quiet state, the exhaust gas recirculation valve ("Audi" including) is closed. But as soon as fuel is supplied to the engine, it is activated. The air discharge formed in the collector causes the membrane to move, and it, in turn, opens the exhaust gas recirculation valve.

Varieties

At the moment there are several types of these devices. The exhaust gas recirculation valve can be mechanical (in turn, divided into 5 modifications) and electronic (there are 3 modifications).

What does he do?

This mechanism is a key component of the recycling system. He brings back some of the burnt substances into the intake manifold and mixes them with air. The latter, in turn, increases the combustion temperature (due to oxygen - O2). Thus, due to an artificial reduction of its content in the fuel-air mixture, the degree of combustion is reduced. Oxygen then interacts with nitrogen, and as the degree of temperature decreases, it becomes larger, so the gasoline burns completely in the chamber.

In addition, the exhaust gas recirculation valve (BMW including) significantly reduces pumping losses, since there is no such strong differential in the pressure on the throttle. A low combustion temperature reduces the level of detonation, and this is a big plus for the motor (there is no loss of torque). As for diesel engines, the EGR valve normalizes the "hard" operation of the engine at idle: due to the reduced combustion temperature, the pressure in the chamber is reduced, so there are no strong vibrations.