What does it mean that the exhaust gas recirculation flow of the Boriger 2 0 is too large

1. This should be a one-way valve in the exhaust valve.

If the system or leather cushion is broken, the wastegas valve needs to be replaced! P0401: Insufficient flow detected by exhaust gas recirculation valve A.

The purpose of the exhaust gas recirculation (EGR) system is to direct a small amount of exhaust gases into the intake manifold when the engine is running at high load. The presence of these exhaust gases reduces the temperature and pressure of the combustion chamber, thereby reducing the emission of nitrogen oxide pollutants.

2. When the car is driving normally and stably and the exhaust gas recirculation system (EGR) is on, if the electronic control unit (ECU) finds that the flow rate of the exhaust gas recirculation (EGR) is too low than the estimate based on other information, the fault code will appear. Causes of failure include DPFE sensor circuits, connectors, or faults in themselves, DPFE tubing faults, egr valve itself faults or blocked pipelines, electronic control modules, etc.

The EGR valve[1] is a mechatronic product installed on a gasoline engine to control the amount of exhaust gas recirculation fed back to the intake system. It is usually located on the right side of the intake manifold, near the throttle body, and has a short metal tube that leads to the exhaust manifold connected to it. Its function is to control the amount of exhaust gas entering the intake manifold, so that a certain amount of exhaust gas flows into the intake manifold for recirculation.

The EGR valve is a very important and critical component in the exhaust gas recirculation unit.

Exhaust gas recirculation is a technology (technique or method) in which a small internal combustion engine for automobiles reinhales a part of the exhaust gas after combustion and is introduced to the suction side.

The main purpose is to reduce nitrogen oxides (NOx) in the exhaust gas and to improve fuel economy at partial load. Take the prefix "egr" of each English word as the general name.

The cycle rate of the EGR is up to 15% in the case of a gasoline engine (in terms of suction volume) and stops at idle and under high load. Large diesel vehicles with a small engine output in terms of vehicle weight have a higher engine load, and EGR technology is often used to meet exhaust standards.

Basic principles of exhaust gas recirculation:

Due to the high specific heat of triatomic gases such as carbon dioxide, water, and nitrogen dioxide in the engine exhaust gas, the heat capacity also increases when the fresh mixture gas and exhaust gas are mixed.

The heat required to heat this mixture diluted by exhaust gas increases by 1 degree Celsius, and the maximum combustion temperature decreases under the condition that the total amount of fuel combustion heat release remains unchanged. At the same time, the dilution effect of the exhaust gas on the fresh mixture reduces the concentration of oxygen, so that the generation of NOx is inhibited.

Exhaust gas return (EGR) is the return of part of the exhaust gas from the engine to the intake duct and re-entering the cylinder with the fresh mixture. The EGR system is the main measure to reduce nitrogen oxides (NOx) in the exhaust gas.

Internal exhaust gas recirculation.

Usually the way in which the engine exhaust passes through the EGR valve into the intake manifold and mixes it with the fresh mixture is called an external EGR.

In fact, this effect of EGR can also be achieved by insufficient exhaust to increase the amount of exhaust gas trapped in the cylinder (i.e. to increase the residual exhaust gas coefficient).

Corresponding to the external EGR described above, this method is called the internal EGR.

The amount of exhaust gas trapped in the cylinder is determined by the overlap angle of the distribution phase, and the larger the overlap angle, the larger the internal exhaust gas recirculation.

Engines with high specific power usually have a large overlap angle and a large internal exhaust gas recirculation due to better inflation, so the NOx emissions are relatively low, but the overlap angle cannot be increased indefinitely.

Excessive overlap angle will cause engine combustion instability, misfire and increase HC emissions, so it is necessary to consider the dynamics, economy and emission performance when determining the overlap angle of the gas distribution phase.

Control policy. As the EGR rate increases, combustion becomes unstable, combustion fluctuations increase, HC emissions rise, power decreases, and fuel economy tends to deteriorate. Carrying out EGR at a small load, especially at idle, will make combustion unstable, and even lead to fire, which will cause a sharp increase in HC emissions. In pursuit of maximum power at full load, the use of EGR will reduce the maximum power and impairs the power.

Therefore, it is necessary to properly control the EGR rate to achieve the best compromise of various properties under various working conditions to achieve the control goal of NOx.

The control requirements for the EGR system are as follows:

1) Since NOx emissions increase with load, the EGR should also increase with load.

2) At idle speed and low load, NOx emission concentration is low, and EGR is not performed to ensure stable combustion.

3) In the process of engine warm-up, the cooling water temperature and intake air temperature are low, the NOx emission concentration is also very low, and the mixture gas supply is uneven.

4) At high load and high speed, in order to ensure that the engine has good dynamics, although the temperature is very high, the oxygen concentration is insufficient, and the NOx emission products are less, and the EGR rate is usually not carried out or reduced.

5) In order to achieve the best effect of EGR, it is necessary to ensure that the recirculated exhaust air is evenly distributed between the cylinders, that is, to ensure that the EGR rate of each cylinder is consistent.

Exhaust gas recirculation, also known as EGR, is based on the principle of returning a small amount of exhaust gases from a diesel or gasoline engine to the cylinder. The inert nature of the exhaust gases slows down the combustion process, i.e. the combustion rate slows down, which leads to a slowdown in the pressure formation process in the combustion chamber, which is the main reason for the reduction of nitrogen oxides. In addition, increasing the exhaust gas recirculation rate will reduce the total exhaust gas flow, so the total pollutant output in the exhaust gas emission will be relatively reduced.

The task of the EGR system is to ensure that the exhaust gas is recirculated optimally at every operating point, so that the combustion process is always in the best possible condition, and the final emission is guaranteed to have the lowest polluting content.

The so-called exhaust gas recirculation system refers to the return of part of the exhaust gas from the engine to the intake manifold and re-enters the cylinder with the fresh mixture. Because the exhaust gas contains a large amount of CO2, and CO2 cannot be burned but absorbs a large amount of heat, the combustion temperature of the mixture in the cylinder is reduced, thereby reducing the amount of NOx generated.

Hello, this is a phenomenon of damage to the secondary inlet valve. It is recommended to judge the cause of the problem after a comprehensive inspection [car problem, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

Hello, according to you, the most direct symptom of the problem is the organic oil in the air intake, the air filter will be justified, and the consumption of engine oil will increase.

Hope it helps you [Car questions, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

P0402 Fault Code: Exhaust Gas Recirculation Valve A Detects Too Large Flow Rate. The EGR is thoroughly cleaned to ensure that the needle valve of the EGR is back in action and working smoothly.

After the engine is started, it idles for a while. The user puts his finger into the exhaust gas recirculation valve, presses it on the diaphragm or on it, and checks whether the exhaust gas recirculation valve is moving. In the cold state, press the accelerator pedal to increase the engine speed to about 2000r min, at this time, the exhaust gas recirculation valve should not be opened, and the action of the diaphragm should not be felt on the fingers.

In the hot state (water temperature higher than 50), the user presses the accelerator pedal to make the engine speed rise to about 2000r min, at this time the exhaust gas recirculation valve should be opened, and the fingers should be able to feel the action of the diaphragm, indicating that the system is not working properly, and the system components should be further checked.

Either the computer incorrectly instructed the EGR valve to open at an excessive angle, or the electronic control system of the EGR valve itself is faulty. Go to the 4 son to get tested.

Remove the EGR (exhaust gas recirculation valve) valve (a part on the side of the engine that is about the size of a can) and clean it with carburetor cleaner.

Is there a blockage somewhere?