What are the common faults of automotive three way catalytic converters?

High temperatures, burning, poisoning, clogging.

The main manifestations of three-way catalysis are broken:

1. The exhaust smell is unpleasant.

2. The engine is overheated, and there is a possibility of excessive wear in the early stage.

3. The engine is sluggish, sometimes there are strange sounds, and the sound of firing guns is common.

4. Fuel consumption has risen, and the fuel consumption of some cars will increase significantly.

The three-way catalytic converter is easily affected by the road surface during driving, resulting in a drag bottom or strong vibration, resulting in the collision of the catalytic converter, resulting in the crushing of the three-way catalytic converter carrier, which is easy to block the exhaust channel, resulting in a decrease in power performance, an increase in fuel consumption, and a deterioration in emissions.

Precautions: 1. If there is mechanical damage, thermal sintering, mileage of more than 200,000 kilometers, and lead poisoning, the cleaning effect is not large.

2. If the engine is turned off in the middle of cleaning, immediately disconnect the connecting hose between the engine and the equipment, and close the flow valve. Start the engine again, and only reconnect and adjust after the idle speed is stable.

3. Check whether the concentration of the mixture is appropriate to ensure that the liquid can be sucked into the air inlet in the form of a mist.

4. The ternary should be cleaned after cleaning the throttle, fuel injector and combustion chamber.

5. During the cleaning process, the idle speed should not be too high to avoid overheating the three-way catalytic converter.

6. Do not drip the cleaning liquid on the paint surface of the vehicle.

7. Keep the workplace away from the fire source and take fire protection measures.

1. The exhaust emissions exceed the standard, and the annual examination fails.

After failure, the fuel combustion is insufficient, the emissions of carbon monoxide CO, hydrocarbon HC, and nitrogen oxide NOX increase, the exhaust gas exceeds the standard, and the annual inspection fails.

After the failure, the normal operation of the oxygen sensor is affected, and the engine cannot accurately receive the oxygen sensor signal, and cannot accurately control the fuel injection, air intake, and ignition, which in turn leads to an increase in fuel consumption.

3. The exhaust is not smooth and the power is reduced.

4. Cause spontaneous combustion.

When the temperature rises to the ignition point of adjacent parts or there is a relatively easy object to touch the red-hot exhaust pipe, it is easy to cause spontaneous combustion.

Hello, the automotive three-way catalytic converter is the most important external purification device installed in the automobile exhaust system, which can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. Because this catalytic converter can convert the three main harmful substances in the exhaust gas into harmless substances at the same time, it is called TWC

The air-fuel ratio of the mixture is computerized, and the computer sends a command to the fuel quantity control device to adjust the air-fuel ratio (:1) in the direction of the theoretical value. This adjustment often exceeds a theoretical value, and the oxygen sensor detects it and reports it to the computer, which then issues a command to call it back:

1。Because each adjustment cycle is fast, the air-fuel ratio does not deviate: 1, and once in operation, this closed-loop adjustment is continuous.

The use of closed-loop control of the EFI engine, because the engine can always run under ideal working conditions (the air-fuel ratio does not deviate too much from the theoretical value), so as to ensure that the car not only has good power performance, but also can save fuel. In severe cases, it will cause poor exhaust and weak acceleration, or even not, and you need to pay attention to refueling at ordinary times.

If the car has these situations, it may be that the three-way catalytic converter is broken, and those who have a car must figure it out.

Weak acceleration, excessive exhaust gas, fault light on? It's time for your three-way catalytic converter to be serviced.

The engine power decreases, stalls or starts difficulties and exhaust gas exceeds the standard.

With the gradual upgrading of automobile manufacturing emission standards, three-way catalysts have gradually become the focus of attention of automobile enthusiasts. What is the function of this component and what is the principle of exhaust gas purification? The aerobic sensor behind the three-way catalytic converter detects the oxygen content in the exhaust gas to determine whether the air-fuel ratio is normal.

The three-way catalyst consumes part of the oxygen during operation, so the oxygen content in the exhaust gas detected by the rear oxygen sensor is low. If the three-way catalyst is removed, the exhaust gas is untreated and the oxygen content in the exhaust gas is high. At this point, the oxygen sensor detects that the oxygen level is too high and thinks that the mixture is too thin, the injected oil will be enhanced, and the fuel consumption will naturally increase.

Due to the different computer models and manufacturers used in each automotive sector, the symptoms after open three-way catalysis are also different. If the mixture is too thin, there will be symptoms such as ignition difficulty, driving weakness, and tempering; Excessive concentration of the mixture can lead to symptoms such as rapid acceleration of the engine, black smoke, redness of the exhaust pipe, and increased fuel consumption. Leaded gasoline cannot be used in cars equipped with three-way catalysts, because after the combustion of leaded oil, when the lead particles are discharged with the exhaust gas, they will cover the surface of the catalyst, reduce the action area of the catalyst, greatly reduce the conversion efficiency of the catalyst, and lead to three-way catalyst lead poisoning.

Therefore, when refueling, it is best to choose a regular gas station, and do not be greedy for cheap and choose an unqualified private gas station. Abnormal operating conditions such as tempering or repeated stalls should be stopped for inspection in a timely manner, as these conditions can cause permanent damage to the catalytic converter. The catalytic converter uses platinum, rhodium, and palladium as catalysts, and reacts with the above three gases at a fixed time in a high-temperature environment to obtain oxygen, nitrogen, carbon dioxide, and water after the reaction.

However, this is not 100% complete catalysis of the three substances, but rather a reduction in emissions to a certain extent.

But after removing the three-way catalytic converter, the exhaust becomes smoother, the power performance of the engine in the high-speed range will improve, and the power should be slightly increased. But all these costs are serious pollution, fuel consumption and noise. When driving on uneven roads, drive carefully, taking special care not to "support the bottom".Since the three-way catalyst is mostly a catalyst carrier formed by honeycomb pottery, it is easy to break after collision, making the catalyst fail and the exhaust pipe is blocked.

The three-way catalytic converter is actually an external purification device in the exhaust system of the car, without the three-way catalytic converter, the car will not fail, but it will have a serious impact on the environment.

The automotive three-way catalytic converter is the most important external purification device installed in the automobile exhaust system, which can convert harmful gases such as CO, HC and NOx discharged from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction; Without a three-way catalytic converter, the car would have broken down.

Three-way catalysis is a part used to convert harmful substances from exhaust gases. Without a three-way catalytic converter, the car will not break down.

Three-way catalysis refers to the transformation of the three harmful gases emitted by automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction, and this catalytic method can convert these three main harmful substances into harmless substances at the same time, so it is called three-way catalytic converter. So today, let's talk about what kind of tips will there be after the car three-way catalytic converter has a problem?

1.Lack of power and poor exhaust.

When the three-way catalytic converter is blocked and high-pressure exhaust is required, the blockage will affect the exhaust is not smooth, which in turn affects the air intake, reduces the engine output power, and leads to the phenomenon of insufficient vehicle power. And when the engine exhaust is not smooth, part of the exhaust gas may be trapped in the cylinder, which will dilute the concentration of the mixture and slow down the combustion rate. When the intake valve is opened and activated, the gas mixture is still burning.

At this point, the combustion gas mixture will flow back into the intake pipe by opening and activating the intake valve, which will lead to a flashback phenomenon.

2.The engine shivers and vibrates, the fault problem lights are on, and the engine is often stalled.

When the three-way catalytic converter is seriously blocked, the exhaust gas cannot be discharged immediately, forming a back-pressure flow. When the pressure of the back pressure flow is greater than the pressure value discharged by the engine, it will recoil to the combustion chamber, affecting the shaking and vibration of the engine, and the fault lamp will be lit and the flame will be turned off frequently.

The blockage of the three-way catalytic converter reduces the exhaust function of the engine, so that part of the exhaust gas is trapped in the cylinder, causing the mixture to thin out and slow down the combustion rate. When the intake valve is opened, the mixture that is still burning will flow back to the intake pipe through the open intake valve, resulting in a backfire.

4.The exhaust pipe is severely blackened.

Under normal circumstances, or when the mixture is fully combusted, no carbon deposits will be generated, but when the engine air-fuel ratio is wrong, especially when the mixture is too thick, the fuel is more likely to produce carbon deposits when the mixture is high temperature and lack of oxygen. Most of the carbon deposits will be emitted from the vehicle through the exhaust pipe, but some of it will adhere to the inside of the exhaust pipe, three-way catalytic converter and oxygen sensor. Over time, the working conditions of the three-way catalytic converter and oxygen sensor will deteriorate, and the emission pollution will increase.

If there is a very serious problem, the fault light will be on, and there may be some problems during the annual inspection, the exhaust will have some unpleasant smell, and the engine will be weak. Performance will be degraded. Fuel consumption will increase.

The car will be very expensive, and there will be certain problems with the exhaust pipe, and there will be a lot of sound when the car starts.

If there is a problem with the car's three-way catalytic converter, the car's fault light will turn on, and black smoke will come out of the rear of the car.

There is a problem with the three-way catalytic converter of the car, the car disadvantage light is on, and there is black smoke coming out of the rear of the car.

If there are major achievements, the disadvantages are lit, and there may be some problems at the time of the annual inspection, the exhaust has some unpleasant taste, and the planning machine is boring. Decreased sexuality. Increased fuel consumption.

After driving in China for a period of time, there will be a series of problems such as ternary failure, excessive exhaust, poor exhaust, increased back pressure, decreased power, increased fuel consumption, and even serious problems such as ternary blockage and spontaneous combustion of vehicles. The main reason for ternary failure in foreign countries is the high temperature inactivation caused by highway driving, while in China it is mainly caused by chemical complexes of sulfur, phosphorus and carbon monoxide. The main reasons are as follows:

1.Low fuel label and poor oil quality.

At present, China's automobile emissions implement Euro 2 standards, Euro 2 standard fuel octane number, while China has only three grades, all lower than Euro 2 standard fuel. In 2004, the China Bureau of Technical Supervision conducted a quality inspection of Beijing gas stations, and the pass rate was only 50%, of which 71% was for Sinopec gas stations. Fuel oil with low grade and poor oil quality will be adsorbed on the surface of the three-way catalytic converter due to incomplete combustion, forming chemical complexes, which will make the three-way poisoning ineffective over time.

Experiments show that after adding low-grade and low-quality oil fuel to Euro 3 standard luxury cars, fault lights will appear when driving hundreds of kilometers, indicating that the exhaust gas exceeds the standard and the fault is ternary.

2.The fuel has a high sulfur content.

3.The roads are heavily congested.

Due to the restrictions of the living and working environment, most of the private cars in China drive in cities, and urban road congestion is a common phenomenon. Road congestion will cause incomplete fuel combustion, produce a large amount of carbon monoxide, which is easy to adsorb on the active surface of the three-way catalytic converter, resulting in the failure of three-way poisoning. Therefore, long-term low-speed driving, acceleration and deceleration are also the main causes of three-way failures.

4.Resolution.

Due to poor fuel quality, high sulfur content, and congestion on urban roads, this will lead to a short service life of the car ternary purifier, which is prone to poisoning and failure. Fortunately, this poisoning failure can be reversed. The chemical complexes of sulfur, phosphorus and carbon monoxide can be removed under a certain high-temperature oxidation environment, and the three-way catalyst can be reactivated.

Based on this, three-way cleaning and maintenance products and technologies have been developed. The principle is that the ternary cleaning agent enters the engine combustion chamber through the intake vacuum tube for combustion, produces a large number of active oxygen ions, and establishes a high-temperature and strong oxidation environment inside the three-way catalytic converter. Through chemical reactions, the chemical complexes of sulfur, phosphorus, carbon monoxide and carbon-containing deposits on the surface of the three-way catalyst are converted into sulfur dioxide and carbon dioxide gas for discharge, so as to clean the three-way catalyst and restore the three-way activity.

The ternary cleaning agent is a highly polar solvent that has a strong dissolving and cleaning effect on carbon deposits in the injector and intake valves. At the same time as cleaning the ternary, it also cleans the injector and air intake system to a certain extent, so the cleaning ternary maintenance is a comprehensive cleaning and maintenance of the fuel system. Compared with other cleaning and maintenance methods, it has obvious effects in reducing exhaust emissions, improving power and reducing fuel consumption.

Although the three-way catalytic converter used in China's cars is prone to failure, its exhaust purification function can be restored through cleaning and daily maintenance. Therefore, as long as the three-way catalytic converter of Chinese automobiles is cleaned and maintained regularly, the service life will exceed that of foreign countries.

Three-way catalytic converter"Blockage and blockage fault manifestations.

1. The first stage is the slight blockage stage. At this stage, the chemical complex is adsorbed on the surface of the catalyst. Only the first hunger or now the exhaust gas purification function is reduced. Exhaust emissions exceed the standard.

2. The second stage is the moderate blockage stage: the chemical complex has accumulated on the surface of the catalyst to a certain extent, and the exhaust back pressure increases at this stage. Fuel consumption increases, power decreases.

3. The third stage is the stage of severe blockage. Due to severe blockage,"Three-way catalytic converter"The operating temperature increases. A high-temperature sintering jam is formed at the front end of the three-way catalytic converter.

4. High temperature sintering blockage. High-temperature sintering plugging is divided into two types: one is metal sintering blocking.

One is carbon deposition, sintering, coking and blocking. It is determined by whether lead-containing and manganese-containing antiknock agents are used in the fuel, and this stage is manifested as a serious decrease in power, frequent stalling, and in severe cases, the exhaust pipe burns red, and even causes the vehicle to spontaneously combust.

How it works. When the engine exhaust gas is discharged through the exhaust pipe, due to the catalytic effect of purifying agent in the three-way catalytic converter, the activity of C0, HC and NOx is enhanced, thereby carrying out the redox-reduction reaction, wherein, C0 is oxidized into colorless, non-toxic C02 at high temperature, HC compound is oxidized into H20 and C02 at high temperature, NOx is reduced to N2 (nitrogen) and 02 (oxygen), so that the exhaust emission of engine is purified.

The cause of the blockage.

1. Gasoline: Gasoline has a high sulfur content, and it is easy to form chemical complexes in the three-way catalytic converter to cause blockage. Poor oil quality, and a lot of gum gasoline can easily cause the three-way catalytic converter to clog.

The use of leaded or manganese-containing antiknock gasoline is easy to cause three-way catalytic converter blockage, although the use of leaded gasoline has been strictly prohibited in China. However, in some areas, lead pollution is serious during the transportation and storage of gasoline. In order to reduce costs, some small oil refineries are still illegally using lead antiknock agents.

Manganese-containing antiknock agents have been banned in developed countries, but they are still used in most parts of our country). The use of ethanol gasoline is easy to cause blockage of the three-way catalytic converter, and the ethanol gasoline is easy to form carbon deposits in the combustion chamber, and at the same time, ethanol gasoline has a flushing effect on the colloidal carbon deposits in the air intake system and combustion system, and the colloidal carbon deposits that are washed down are easy to form blockages in the three-way catalytic converter.

2. Engine oil: Long-term use of engine oil containing sulfur and phosphorus antioxidants is easy to cause blockage of the three-way catalytic converter.

3. Road: Because the car produces the most incomplete combustion under the condition of acceleration and deceleration. Therefore, driving on congested roads for a long time is easy to cause the three-way catalytic converter to be blocked.

4、"Fuel injector and air inlet are not dismantled and cleaned": Because a large amount of colloidal carbon deposits will be washed off during the cleaning process. Therefore, it is easy to cause the three-way catalytic converter to be blocked, which is also carried out by some vehicles"Fuel injector and air inlet are not dismantled and cleaned"Reasons for the increase in rear fuel consumption.

5. Turbocharging: Vehicles with turbocharging are prone to three-way catalytic converter blockage. This is mainly due to incorrect operation by the driver.

Three-way catalytic converter"Blockages are formed gradually, the formation of blockages is reversible, and blockages can be reduced by chemical processes such as oxidation and gasification, or by physical processes such as desorption and evaporation of volatile components and gas-phase components.