What do car fuel injectors do? What is the function of a car fuel injector?

When the solenoid coil is energized, the suction is generated, the needle valve is sucked up, the nozzle hole is opened, and the fuel is sprayed out at high speed through the annular gap between the shaft needle and the nozzle hole at the head of the needle valve, forming a mist shape, which is conducive to full combustion. In the past, the fuel injector used in diesel engines was mechanically controlled, and the mechanical diesel nozzle was realized by controlling the precision parts (needle valve, needle valve body). The coupling of the nozzle is one of the three precision coupling parts of the traditional diesel engine

Plunger, plunger sleeve, needle valve, needle valve body, oil outlet valve, oil outlet valve seat. The nozzle of the gasoline engine is a part of the electric control system of the gasoline engine, which replaces the carburetor of the carburetor type gasoline engine. The main nozzles used in automobiles are:

Diesel nozzles, gasoline nozzles, natural gas nozzles, etc., now some foreign manufacturers can manufacture special nozzles for hydrogen.

The name of the injector specialty is the injector. The injector receives the injection pulse signal from the engine's electronic control unit to accurately control the amount of fuel injected. The injector is a precision device with very high processing accuracy, which requires a wide dynamic flow range, strong anti-clogging and anti-pollution ability, and good atomization performance.

The quality of the fuel injector plays a fundamental role in the power play of each engine. Poor fuel will lead to ineffective injectors, serious carbon deposition in the cylinder, accelerated wear of cylinder barrel and piston rings, resulting in unstable idling, increased fuel consumption, weak acceleration, difficult start-up and excessive emissions; In serious cases, it will completely block the fuel injector and damage the engine. Therefore, it is necessary to clean the fuel injector regularly, or use fuel cleaner to clean the oil circuit to prevent clogging, and long-term failure to clean or frequent cleaning of the nozzle will cause bad effects.

Hello! The function of the automobile fuel injector is that gasoline is directly injected into the cylinder from the fuel injector, which can produce fog vapor in the cylinder body, and detonate it with electric ignition. When the solenoid coil is energized, the suction is generated, the needle valve is sucked up, the nozzle hole is opened, and the fuel is sprayed out at high speed through the annular gap between the shaft needle and the nozzle hole at the head of the needle valve, forming a mist shape, which is conducive to full combustion.

The injector itself is a normally closed valve, and the valve is always closed when no control signal is input; The normally open valve is when there is no input control signal, the valve is always open, and the opening and closing of the valve is controlled by the upward and downward movement of a valve pin. When the ECU gives the injection command, the voltage signal will cause the current to flow through the coil in the fuel injector, generating a magnetic field to suck up the valve pin, so that the valve can be opened so that the oil can be sprayed through the injection hole.

Hello, the car fuel injector is a normally closed valve, which is controlled by the upward and downward movement of a valve pin to control the opening and closing of the valve.

Gasoline atomization is injected into the cylinder.

The fuel is injected at high speed through the annular gap in the fuel injector, resulting in a mist liquid that facilitates full fuel combustion. When the solenoid coil is energized, the suction force is generated, the needle valve is sucked up, the nozzle hole is opened, and the fuel is sprayed out at high speed through the annular gap between the shaft needle and the nozzle hole at the head of the needle valve, forming a mist shape, which is conducive to full combustion.

1. How to find out if there is a problem with the fuel injector?

1. Fault indicator.

This is the most intuitive, the easiest, and the clearest way to tell us what went wrong. No matter what kind of car, as long as there is a problem with the engine-related parts, an engine logo will appear on the display interface in the car, and then we must pay attention to it, because it is definitely not a trivial matter for this sign to be lit.

2. Driving power.

Although the horsepower of the vehicle is different, it is different in terms of acceleration and power, but if you drive a car for a long time, you must know a lot about the acceleration and power of the car. If there is a sudden slow acceleration, the gas pedal does not go, and the engine sound is too loud, then there is a problem with the fuel injector, which proves that the engine is overloaded at this time, then we have to quickly drive the car to the 4S shop for inspection.

3. Fuel consumption.

Some friends may ask, since they are all blocked, shouldn't they be more fuel-efficient? How can fuel consumption increase? In fact, if you know, you will understand how the fuel injector works.

Gasoline is transferred from the fuel tank to the injector, where it is atomized and sprayed by the injector, and the general fuel consumption is maintained at a balanced value. However, if the fuel injector fails, it may not be sprayed, but will flow out directly, causing incomplete combustion of gasoline. So it will deepen fuel consumption.

Therefore, when the fuel consumption is abnormally high, it should be a problem with the fuel injector.

Second, how to repair and clean up the fault of the fuel injector.

1. Cleaning agent cleaning.

Generally, if there is a problem with the fuel injector, the two commonly used methods are cleaning and replacement. Let's talk about cleaning first, for the owner of the car owner who has a heavy sense of maintenance, adding a cleaning agent containing benzene or benzene fragrance, it can play a role in cleaning, when people this kind of cleaning is not very thorough, but it is simple, suitable for long-term maintenance to use.

2. Dismantle and clean.

Compared with the long-term maintenance of the cleaning agent, there is also a cleaning method, that is, to remove the fuel injector and clean it directly, which is simple, rough and effective. But the cost is a little higher, you need to go to a professional maintenance office, find a professional master to operate. This kind of cleaning can last about 12---000 kilometers, and for friends who don't run long distances, it can be maintained for about a year.

3. Direct replacement.

In the case that the fuel injector is too serious to age, can not be cleaned, then we can only change, this is also the standard style of the 4S shop now, in addition to the high price, whether it is in terms of fuel consumption or in the engine, it is naturally better than using the old, third, how to prevent the fuel injector from clogging and damage.

1. Since the fuel injector blockage is formed by the carbon deposition of gasoline impurities, adding high-quality gasoline can naturally reduce the production of impurities and thus reduce the possibility of fuel injector blockage, and if you don't go out, try to refuel at a gas station.

2. Choose a good quality lubricating oil, because the best lubricating oil can inhibit the generation of carbon deposits.

3. Try not to idle for a long time, but this point cannot be changed by manpower, after all, road congestion is not a person, you can only try to choose a better road, and you can also run more high-speed under the premise of safety.

Some car engines have fuel injectors on the intake manifold, and some car engines have fuel injectors on the cylinder head. Some cars have two sets of fuel injectors, one on the intake manifold and the other on the cylinder head. The position of the injector depends on what injection method is used in the engine.

If the fuel injector is on the intake manifold, then the fuel injection method of this engine is multi-point EFI.

If the fuel injector is on the cylinder head, the fuel injection method of this engine is direct in-cylinder injection.

If the engine has two sets of fuel injectors, the fuel injection used in this engine is mixed injection.

Engines equipped with hybrid injection technology can choose different fuel injection methods under different operating conditions, which can improve the efficiency of the engine and can improve the power of the engine.

Most of the ** cars are using in-cylinder direct injection technology, and the power of the in-cylinder direct injection engine is stronger.

Engines with direct injection inject gasoline directly into the combustion chamber, where the air from the engine is mixed with the gasoline.

The injection pressure of the in-cylinder direct injection engine is higher, and the mixture of gasoline and air is better, so the power of this engine is also stronger.

However, the direct injection engine also has disadvantages, and the combustion chamber and valves of this engine are more prone to carbon deposits.

Car Fuel Injector: A simple solenoid valve.

When the fuel passes through the fuel injector, there is a gel inside the fuel injector, and there is insufficient combustion impurity carbon deposit on the outside, which makes the fuel injector too dirty.

The role of the fuel injector is to deliver the fuel precisely to the inside of the engine for combustion. A car fuel injector is a simple solenoid valve. When the solenoid coil is energized, the suction force is generated, the needle valve is sucked up, the nozzle hole is opened, and the fuel is sprayed out at high speed through the annular gap between the shaft needle and the nozzle hole at the head of the needle valve, forming a mist shape, which is conducive to full combustion.

When the fuel injector fails, it will lead to an increase in carbon deposition in the engine, unstable idling, increased fuel consumption, weak acceleration, difficult starting, excessive emissions, etc., and in serious cases, it will cause the fuel injector to be blocked, and then damage the engine.

Reasons for higher fuel consumption:

1. Poor ignition: the spark plug gap is too large, and the ignition coil energy is not enough;

2. Poor atomization of fuel injector: the fuel pressure regulator is faulty, and the fuel pressure is too high;

3. Excessive carbon deposition in the engine: part of the gasoline sprayed is absorbed by carbon deposition;

4. Sensor failure: For example, the failure of the water temperature sensor will cause the engine to be mistaken for a cold state, and will always send out a fuel injection signal, resulting in high fuel consumption;

5. Oxygen sensor failure: the fuel correction will be invalid, the computer will always send out the signal of fuel injection, and the failure of the air flow meter will cause the incorrect air intake data.

When encountering a blocked fuel injector, pay attention to the following points;

First, don't coax the throttle with a big foot, especially if the fuel injector is blocked, which will cause the fuel injector to be completely damaged.

Second, the fault light is not good for a long time, and the fault light will be reported after a certain number of times, indicating that the car is not burning well before, which may be oil or oil deterioration and there is no good fuel to burn.

Third, in the case that the oil circuit is not cleaned and improved, cleaning the throttle will lead to increased air intake, thinning of the mixer, and the vehicle will shake at idle, and the throttle will be channeled.

Fourth, repairing a car does not mean that it will be good, and repairing it may aggravate problems in other places. This is normal and requires the use of elimination.

Fifth, in the case of poor combustion, shaking, and scurrying, the first thing to clean the oil circuit is, and not to rush to replace the accessories.

This is very easy to deal with, encounter such a fault code, after the detection, it has been determined that the fuel injector is blocked, then the traditional way is to disassemble the fuel injector to replace, not to mention the replacement of the labor costs, we will say the reason for this, we have to first figure out why it will be blocked, will be after the replacement, to avoid the later blockage, after all, the replacement cost is very high, you replace the plug again, is it to consume a lot of cost.

There are two types of blockage, one is the external blockage caused by ash and carbon deposits on the outside of the fuel injector in the combustion chamber, and the other is the internal blockage caused by the oil in the oil circuit. Both of these blockages can be cleaned and unblocked by PNF-based additives. But be sure to use effective additives.

Don't wait for the car to have a problem before thinking about changing the parts, the cost outweighs the loss.

Hello, I have seen your inquiry, please wait for a moment and answer it for you immediately.

This depends on which model can be determined, the model is different, and the price of his accessories is also different, for example, if it is about 100,000 yuan for this model, it needs about 500 yuan for the original part of this part to be replaced in the repair shop outside, and it needs more than 280 yuan. Because of this fuel injector, he is a high-pressure fuel injector, and his precision is still relatively high, so its price is relatively expensive.

Questions. Toyota Corolla 18 years car.

How much? If you want to use the fuel injector of this car, it will cost you more than 430 yuan to replace the original one, and it will cost more than 260 yuan to replace the original one, and the repair shop outside will cost more than 260 yuan.

The fuel injector of the car is the ignition system, the fuel injector is injected after the spark plug is ignited, and then the car can be ignited.

Inject fuel into the engine. From the point of view of the fuel path, first of all, the fuel pump sends the oil from the fuel tank to the oil pipeline, and the oil pipeline then sends the oil to the oil rail;

Inject fuel into the engine.

From the point of view of the fuel path, first of all, the fuel pump sends the oil from the fuel tank to the oil pipeline, and the oil pipeline then sends the oil to the oil rail;The rail is controlled by a regulator to control the fuel pressure and ensure that the fuel pressure sent to each cylinder is the same. On the other hand, the regulator will also relieve the pressure by sending excess oil to the return line and back to the tank.

One end of the fuel injector is connected to the fuel rail, and the engine ECU will issue fuel injection instructions to the fuel injector according to the engine operation status, and the fuel injection amount is determined by the fuel pressure and the fuel injection time of the fuel injector. The fuel pressure is controlled by the regulator at the fuel rail, and the pressure of the fuel regulator is adjusted by the manifold vacuum (engine load), so what the ECU can control is the injection time, when the engine needs more fuel, the injection time will be longer, and vice versa.

It is understood that the gasoline engine is composed of five systems: crank connecting rod mechanism, gas distribution mechanism, starting system, lubrication system, cooling system, fuel supply system and ignition system. In order for the engine to work, three prerequisites must be met: a good air-fuel mixture, sufficient cylinder pressure and strong sparks. So, how does the oil in our tank get to the engine for combustion?

To put it simply, the gasoline in the tank is pressurized by the gasoline pump through the filter and then delivered to the injector through the tubular pump. According to the signal of the engine ECU, the fuel injector injects fuel into the intake manifold or cylinder, mixes it with the air entering the cylinder, and ignition combustion with a spark plug to do work. Therefore, the role of the fuel injector is to accurately send the fuel to the inside of the engine for combustion.

There are two types of injection types of fuel injectors mentioned above, and there are also two types of fuel injectors. Injecting one into the intake manifold is called intake manifold injection, and injecting the other directly into the cylinder is called direct in-cylinder injection. The construction principle of their nozzles is the same, but the pressure they are subjected to is different.

The line pressure of the intake manifold circuit is usually 2-8 km, and the hydraulic pressure after daily fire extinguishing is 1 km, which is also a parameter to judge whether there is a problem with the oil circuit. The direct injection in the cylinder is high-pressure injection, and its pipeline hydraulic pressure can reach 24-200 km. Both have advantages and disadvantages.

Intake manifold injection not only has the effect of cleaning the valve, but also has the effect of being flammable and more fully combusted, which is not conducive to carbon deposition. However, due to the long route, the fuel injection was inaccurate, which led to an increase in fuel consumption and a lack of power. The direct injection in the cylinder is directly injected into the cylinder, the injection amount is accurate, and the fuel consumption is high.

At the same time, the combustion efficiency is sufficient and the power is strong. The downside is that carbon is easy to accumulate. The method of judging whether the fuel injector is faulty is that the common failures of the fuel injector are fuel injector blockage and fuel injector pressure relief.

Injector clogging is the accumulation of carbon due to inadequate combustion of the gas mixture. Otherwise, it will block the injector nozzle and cause poor fuel injection. It is manifested as engine shaking, engine failure light on, poor acceleration and other phenomena.

Fuel injector pressure relief is caused by poor oil seal sealing, and the hydraulic pressure in the pipeline is insufficient. Faults and lands indicate that the engine is difficult to start, especially with cold starts. How can I avoid and solve injection failures?

The injection of the intake manifold can be removed and cleaned. The direct injection nozzle in the cylinder is actually made of high-pressure jet, which cannot be cleaned by the method shown above, and needs to be cleaned with a professional jet cleaning machine. The best way to prevent injector failure is to add qualified gasoline, because the direct injection in the cylinder is directly located in the fuel chamber, which is prone to carbon plugging.

For this reason, the factory requires the addition of injector cleaning agent every 10,000 kilograms to reduce carbon accumulation in the injector. So we add it according to the requirements of the user manual to avoid follow-up problems.