What is the pipe between the accelerator and the cylinder head of a car?

Throttle is a controllable valve, which is used to control air to enter the engine. After entering the intake pipe, it is mixed with gasoline (different models of cars have different design mixing parts) to become combustible mixture, which participates in combustion and does work. Four-stroke gasoline engines are generally like this. Throttle is the most important component in EFI automobile engine system. Its upper part is the air filter, and the lower part is the engine block, which is the throat of the automobile engine. Whether the acceleration of a car is flexible is closely related to the cleanliness of the throttle. Whether the throttle should be removed for cleaning is also the focus of discussion among car owners.

Throttle is a controllable valve that controls air to enter the engine. After the air enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, which will be burned to do work. It connects the air filter and the engine block, and is called the throat of the automobile engine.

Throttle is a controllable valve that controls air to enter the engine. After the air enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, which will be burned to do work. It connects the air filter and the engine block, and is called the throat of the automobile engine.

There are two kinds of throttles: traditional cable throttle and electronic throttle. The traditional engine throttle control mechanism works by pulling a cable (soft steel wire) or a pull rod. One end of the cable is connected with the accelerator pedal, and the other end is connected with the accelerator linkage plate. The electronic throttle mainly uses the throttle position sensor to control the throttle opening according to the energy required by the engine, so as to adjust the intake air.

How to clean and prevent it should be removed and washed! Correct some misunderstandings of throttle cleaning! The main cause of throttle scaling is oil and gas, followed by particles and moisture in the air. In other words, using qualified air filter and removing the crankcase ventilation pipe will slow down the scaling speed of throttle valve.

The crankshaft is built in the crankcase, and the lower part is connected with the oil bottom. The working temperature of this part is about 100 ~ 180.

Release gas

Engine oil will be heated and volatilized during use. The longer the use time, the higher the temperature and the stronger the volatilization. In addition, the compressed gas in the cylinder will squeeze into the crankcase through the gap of the piston ring, so there must be a channel for the gas to escape, otherwise the oil bottom will form a positive pressure (see the related article in Nightcrawler for details).

Negative pressure suction

The reason why the crankcase ventilation pipe is connected to the throttle valve is the requirement of environmental protection on the one hand, and the gas is pumped out of the crankcase by using the negative pressure of intake air on the other hand. When the oily steam reaches the intake pipe and cools, the oil in it will condense on the intake and throttle valve, and then the carbon deposit in the steam will also be deposited on these parts. Because the gap where the throttle valve is opened has the largest air flow, small space and low gas temperature, this part is the easiest to condense.

Cleaning frequency

Therefore, how long the throttle will be dirty depends on the quality of the air filter, the brand and quality of the engine oil, the condition of the driving section, the temperature, the working temperature of the engine, driving habits and so on. Even for individuals, it is impossible to determine the time to clean the throttle with a fixed number of kilometers. The interval between cleaning the throttle for the first time in a new car is the longest. Later, due to the continuous condensation of oil and gas in the crankcase ventilation pipe and intake port, the cleaning frequency will increase, and different weather conditions will also affect the dirty speed of the throttle. ......

wash

Throttle is the most important component in today's EFI automobile engine system. Its upper part is the air filter, and the lower part is the engine block, which is the throat of the automobile engine. Whether the acceleration of a car is flexible is closely related to the cleanliness of the throttle. Whether the accelerator should be removed for cleaning is the focus of discussion among car owners. Expert Liu Ming answered from Beijing SAIC Anji as follows:

Attention problem

If there is too much sludge in the accelerator, it may cause poor engine acceleration and increase fuel consumption, which is a big worry for the owner. What should I do if the throttle is dirty? As long as you clean it, you can get it in the 4S shop quickly, but don't you go to the 4S shop every time? Actually, you don't have to. You can handle it yourself. Just don't forget to initialize.

First, apply a little oil on the fixed metal beam ring to avoid slipping teeth during disassembly. Remove the metal wire harness ring of the throttle hose. After the hose is removed, the left end is the position of the throttle. Remove the negative battery, turn off the ignition switch, straighten the throttle plate, spray a small amount of "carburetor cleaner" into the throttle, and then carefully scrub it with polyester rag or high-spin "non-woven fabric". Deep in the throttle, you can clamp the rag and scrub it carefully where you can't reach it.

When cleaning the throttle valve, it is not necessary to disassemble it, but the sealing part of the inlet steam must be cleaned, and the idle motor must be disassembled for cleaning. There are advantages and disadvantages of cleaning nozzles by borrowing and disassembling. Generally speaking, the maintenance station suggests disassembling and washing, which can prevent other unnecessary waste, such as replacing the sealing ring after disassembling or installing other gaskets, or delaying the owner's time because of oil and gas leakage when disassembling.

After cleaning, the throttle will be initialized according to the disassembly procedure just now. After cleaning the throttle, it needs to be initialized, because the computer has a memory function when adjusting the throttle opening, because there was sludge blockage in the past. In order to ensure the air intake, the computer will automatically adjust the throttle opening to make the air intake in a normal state.

But there is no sludge blockage after cleaning. If the throttle valve still maintains its previous opening, it will cause excessive intake air. As a result, the engine will shake when starting, and the acceleration will be weak, and the engine fault light may light up.

Then why does the engine sometimes work normally without initialization after cleaning the throttle? That's because the throttle is not too dirty, and its intake has not changed much after cleaning. However, the change of the throttle valve after cleaning is invisible to the naked eye and needs to be initialized.

In fact, initialization is very simple. You can do it with a special computer or by hand, but it is not as fast as a computer, and sometimes it will fail. It doesn't matter if you fail. Do it again. According to different cars, there are two ways to initialize:

Initial method

The first is to turn on the second gear of the key, which is the gear indicated by the instrument to be fully lit. Then wait for 20 seconds, press the accelerator to the bottom, hold it for about 10 second, release the accelerator, turn off the ignition switch, pull out the key, and the initialization is complete.

The second is to turn on the key in the second gear and hold it for 30 seconds, then turn off the ignition switch and pull out the key. It should be noted that after the two methods are completed, it will take some time to try to ignite. Generally, you can wait 15-20 seconds, and then ignite to see if the refueling is normal and the engine fault light is off. If at first you don't succeed, do it again until you succeed. You can usually succeed once, at most twice.

But according to different cars, the method of restoration is different. Some cars must be initialized by a computer. In that case, the owner is advised to send the car to a shop with professional equipment for cleaning.

Simple operation

Cleaning the throttle in a 4S shop is actually very simple. Interested friends can do it by themselves according to the picture steps. If time permits, why spend that money? Here are some simple steps to clean the throttle valve. There are many pictures, please refer to the resources directly.

breakdown

The composition of electric throttle can be roughly divided into the following parts: throttle, electromagnetic driver, potentiometer, controller (some not, directly managed by ecu, bypass valve. Its fault characteristics are divided into two categories: hard fault and soft fault. Hard fault refers to mechanical damage, and soft fault refers to dirt, imbalance, etc.

hard failure

The resistance part of potentiometer is formed by spraying a layer of carbon film on polyester substrate, which is actually a very low-level preparation process with low wear resistance. To put it bluntly, it is not as good as the potentiometer of our usual household appliances. The sliding contact consists of a row of opposing claws made of fine steel. Pay attention to the claw! This is simply worse! In addition, the carbon film is not coated with any protective agent, and the falling carbon powder leads to poor contact, which is inevitable.

Soft fault

People often worry about cleaning the throttle, because most of the time the throttle is too low. Air flows through the gap of the throttle at high speed (tens to hundreds of meters per second), and the influence of dust on the airflow exceeds the adjustment ability of the throttle.