is actually a simple injector solenoid valve, when the solenoid is energized, a suction force, the needle is sucked up, open orifice, an annular gap between the pintle and the fuel injection hole by the head of the needle high velocity, formation of mist, facilitates complete combustion. .
The basic introduction nozzle 1
nozzle itself is a normally closed valve (normally closed valve means when the control signal is not input, that the valve is closed; and the valve is normally open when no input control signal, the valve has been turned on, is controlled by a vertical movement of the needle valve opening and closing valve when the fuel injection ECU issued instruction, which causes current to flow through the injector voltage signal the inner coil, generating a magnetic field to pick up the needle valve, the valve opens so that oil can be discharged from the injector Haoshi hole. biggest advantage is to control the oil injection supply of the fuel is very accurate, so that the engine can be in any state there the correct air-fuel ratio, not only to keep the engine running smoothly, it can exhaust normative environmental regulations.
[ 123] nozzle 2. Effect injector coke and
As one of the key components of the injector EFI engine, it is good or bad work performance will be severely affected by the engine. Nozzle blockage will seriously affect vehicle performance. Blockage of the engine due to coke deposition on the fuel injector or due to the impurities clogging the nozzle passageway. After driving the car for some time, it will form a certain fuel system deposits. Formation of deposits and automotive fuel directly related: First, because the gasoline itself contains resin, impurities, or during storage into the dust, impurities, etc., accumulate and form a deposit in a similar sludge tank cars, and other parts of inlet pipe thereof; secondly due to the unstable gasoline component react at a certain temperature, the formation of gum and resin-like dope. The dope in the fuel injectors, intake valves and other parts, when burning coke deposits will become hard.
Further, since the city traffic congestion, often in low speed and idling car state, but will increase the formation and accumulation of these deposits. Great harm fuel system deposits. Deposits clog the nozzle needle, the valve hole, affect the performance of precision electronic injection system components, resulting in dynamic performance degradation; coke deposits formed in the intake valve, resulting in its closed tightly, causing the engine idle speed stability, increased fuel consumption and associated emissions deterioration; hard coke deposits formed in the piston crown and the cylinder head and other parts, due to the high thermal capacity and poor thermal conductivity of the coke, Prone to engine knock and other faults; in addition also shortens the life of catalytic converters. Injectors work is good or bad, for each engine power plays a fundamental role to play. Due to poor fuel injector work not working cause the cylinder coke serious; cylinder, piston ring wear accelerated, resulting in unstable idle speed, increased fuel consumption, accelerate weakness, difficulty starting and emissions exceeded, serious will be completely clogged spray nozzle, damage to the engine.
Therefore, regular cleaning nozzle, or long periods of cleaning frequent cleaning nozzle will cause a bad influence. As a matter of time cleaning, to be determined according to the quality and condition usually add fuel, in general, most recommend that users now about 20,000 to 30,000 km for cleaning. Good condition, good quality fuel can be extended to about 4 to 60,000 km. When the nozzle clogging slightly, also have some impact on vehicle condition. Sometimes there will be such a failure: hang a block, start the car some jitter, etc. upshift during acceleration, this phenomenon disappeared, assuming various sensors working properly the car, valve is also cleaned, the circuit is also normal , it is likely that a slight blockage of the nozzle.
but high gear acceleration, there is likely to be mild gum has been sprayed away (dissolved), and vehicle performance resumed. This small plug nozzle, generally can not clean. Because of minor gum can be dissolved away. Therefore, in daily driving, you should always run a high-speed run, in order to reduce the possibility of coke into lines. When poor quality gasoline or a longer running time of the vehicle, if long periods of cleaning nozzle, this clogging will be more severe, causing poor engine fuel injection, injection angle and poor atomization, causing the engine idling, acceleration or full load condition when the work is not good, so that the engine power drop, increased fuel consumption, increased pollution emissions, even the engine does not work. Therefore, the detection nozzle should be regularly cleaned carefully to ensure good working order.
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3 nozzle conservation
cleaning nozzle
When selecting the specific needs require cleaning – the number of controls fuel : the same type of EFI car fuel pump pressure is constant, regardless of the size of the opening of the throttle valve, as long as the fuel pressure regulator after adjustment, nozzle pressure is always constant. Injectors and fuel pump and a fuel pressure regulator supporting the use of strict, only the design pressure, nozzle atomization to achieve the best results, pressure is lower than the design pressure, spray mist of oil is not, columnar , should not be mixed with air; excessive pressure oil discharged tapered circular shape, are not easy to mix, and the ejection force is too large, a lot of fuel directly sprayed onto the wall, the mixing ratio directly affects the parameters.
whether accelerating or idling, the pressure should be constant. Different models have different pressures (a few selected gear washer friend mentioned, in fact, is to choose the pressure for different models, different is not accelerated idling pressure, wrong choice of injection pressure, nozzle atomization bad). How much fuel injection amount, injection depends on the length of time. Injector according to different control solenoid, driven into voltages and current drive two.
-voltage and low resistance can be divided into high impedance, high impedance can be electrically connected to 12V, low resistance only by a low voltage, 12V misconnection time in the coil will burn longer. When the fuel injection, the computer provides the voltage is constant, for example 12V, immediately becomes 0V when the fuel cut, this change is transient, 0 and 1 like a computer language concepts inside, the intermediate did not say 0.5. In other words, it is a pulsating DC signal, not what kind of alternating current, and so a noun. What does the concept of alternating current? Positive and negative staggered called alternating current. Like inside the car in addition to the generator rectifierPrevious section, reach substantially alternating. When the nozzle clogging, poor injection, or carbon deposition and gluing nozzle gap was less than the design of the fuel injection amount or atomizing effect, it needs to be cleaned.
Troubleshooting
1. Plugging orifice
Available through needle clear, after cleaning to clear the weft carefully. Needle valve body and the nozzle body large flat planar contact failure, wear, or needle larger cylindrical surface. If the needle valve body and the nozzle body large flat plane is bad, it can be used for chromium oxide coated on the plate “8” shape grinding; cylindrical surface wear greater if the needle, the needle coupling parts should be replaced as a pair.
2. Poor seal
poor sealing needle and the needle body , resulting in poor atomization nozzle or drip.
Such a failure can be used fine chromium oxide or toothpaste applied to the needle end of the sealing tape, but do not applied to the cylindrical portion, then the insertion needle needle valve body, until the turn-tight edge side knock co. Chromium oxide grinding stone must be washed away or toothpaste.
3. The air passage
An air passage in the. Simply oil in the air can be excluded.
4. The fuel supply is not normal
for an overhaul of the transfer pump. As a result of the joint pipeline leak, may try to take a good, it does not leak.
5. insufficient elastic force
is less than the spring force of the piston or spring break. Should replace the spring.
6. The piston wear
effects of wear of the piston with oil. Need to replace the piston