What is the mixing concentration of the throttle control pedal directly into the tailpipe that has a

The accelerator pedal indirectly controls the amount of fuel injected from the fuel injector by changing the throttle opening. The throttle valve is located on the intake tract and controls the amount of air intake by changing the size of the throttle valve plate opening. There are also air flow meters and intake pressure sensors on the intake tract, which work with the signals from the accelerator pedal to calculate the actual amount of air entering the cylinder as accurately as possible, and based on the intake air.

When the gasoline engine was invented, how to get gasoline into the cylinder was a problem, and at that time there were no injectors, and even if there was fuel injection later, it was not mature and too expensive.

So the carburetor approach was taken, and the carburetor was such a thing:

The carburetor's fuel injection pattern, which now seems primitive, uses the kinetic energy of the air flow to atomize gasoline. When the throttle opening changes, the amount of mixture entering the cylinder can be changed, causing a change in the concentration of the mixture.

In other words, the carburetor uses air flow to control the amount of fuel injection, which is ancient and simple, in fact, it was slowly eliminated in the 80s of the last century, and it was eliminated in China around 2000.

Why carburetor in it?

The carburetor was introduced in the 1820s, much earlier than the gasoline engine, so when the gasoline engine was invented, it was understandable to use "off-the-shelf" technology.

Secondly, this thing is cheaper, much cheaper than the injector, and the existence of carburetors is very reasonable in that era when there are no regulations and low oil prices.

Later, however, injectors began to phase out carburetors due to upgraded emissions regulations.

The injector sprays the oil on the intake pipe, so how does the oil enter the cylinder? Rather than thinking about letting the oil go directly into the cylinder, the engineers continued to let the air flow and bring the steam in.

So you see, even if the injector appears, it is customary to continue to control the amount of air on the accelerator pedal to achieve the purpose of adjusting the power.

So the question is, why is the throttle pedal attached to the throttle instead of the injector?

It's not that it can't be done, but the inertia from the beginning to the present, it's been done from the beginning, and it has become a habit.

So why does the diesel engine accelerator pedal directly control the fuel injection?

That's another story.

When Diesel invented the diesel engine, what he wanted was to ignite the oil directly, without spark plugs. And the fuel he chose at that time was vegetable oil, heavy oil, and diesel was used later.

Diesel is not easy to volatilize, if it is not directly sent to the cylinder, it is estimated that it will not be able to catch fire if it is brought in by air, so the diesel engine has used such a thing as an injector since the day it appeared.

The oil is injected directly into the cylinder, and the early diesel engines, including the current diesel engines, have the accelerator pedal to directly control the amount of fuel injected.

For diesel engines, it is true that the throttle directly controls the amount of fuel injection, while for gasoline engines, the throttle indirectly affects the amount of fuel injected by controlling the amount of air intake.

How a gasoline engine works.

We all know that gasoline engines have a device called the throttle, which is located on the intake tract and controls the intake volume by changing the opening of the throttle valve. There are also air flow meters and intake pressure sensors on the intake tract, which cooperate with the signal of the accelerator pedal to calculate the actual amount of air entering the cylinder as accurately as possible, and calculate the amount of fuel injected according to the air intake volume combined with the air-fuel ratio, and then control the fuel injector to inject the required gasoline.

So why doesn't the gasoline engine directly control the amount of fuel injected? Wouldn't that be easier and more straightforward? In fact, this is determined by the ignition method of the gasoline engine.

The gasoline engine relies on the spark plug to generate an electric spark to ignite the mixed gas, and the mixed gas must have enough concentration if it wants to be ignited by the electric spark, if the concentration is too low, the electric spark can not successfully ignite the mixture, then the engine can not work normally. If the throttle valve of the gasoline engine is removed, the piston can draw in the most air with each inhalation. When the injection volume is too low, the mixture will become thinner, the spark plug will not ignite, and the engine will stall.

Assuming a gasoline engine, the cylinder can enter up to 10 parts of air. When the throttle valve is opened 10% at idle, the amount of air entering the cylinder is 10%, which is 1 part. At this time, spraying 1 part of oil can form a mixture of sufficient concentration.

But if we remove the throttle, the intake channel is completely open, which is equivalent to 100% opening of the throttle, then the air entering the cylinder has also increased to 10 parts, at this time, another part of gasoline will definitely not be able to form a sufficient concentration of gas, and the spark plug will not be able to ignite the mixture, so the engine will not work properly. In order for the engine to work properly, you can only spray more oil, which is equivalent to letting the gasoline engine run in floor oil mode. Therefore, if the gasoline engine does not have a throttle, then it will either stall or run at maximum power, which of course cannot be used normally.

How diesel engines work.

Although some diesel engines also have throttle valves on the intake tract, they are fully open when working and only close when the engine is turned off to prevent the engine from taking in too much air and causing excessive vibration when the engine is turned off.

When the diesel engine is working, the cylinder can draw in the most air in each intake stroke. However, the diesel engine is not afraid of the mixture being too thin, because the diesel engine is compression-ignited, and the air in the cylinder at the end of the compression stroke is violently compressed to produce high temperatures, which is enough for the diesel to spontaneously combustion. Therefore, the diesel engine only needs to control the amount of oil entering the cylinder to adjust the engine power.

For example, when a diesel engine is working, the cylinder can enter 10 parts of air, at this time, the fuel injector sprays 1 part of diesel, although there is more gas and less oil, but the diesel fuel will spontaneously combust immediately after being injected into the cylinder, and it can also generate power, so the engine can operate normally. When you need to increase the rpm, you just need to increase the amount of fuel injected.

Is it true that the accelerator pedal controls the amount of oil?

The accelerator pedal controls the amount of air intake, and the engine works by burning a mixture of gasoline and air, and the amount of air intake determines the amount of fuel injection, thereby determining the engine speed.

No, it controls the amount of air, and the power of the car is provided by the combustion of combustible mixtures, which can more effectively control the actual combustion situation by controlling the entry of air, making the combustion more economical.

1.The development process of electronically controlled fuel injection technology for diesel engines can be divided into three generations.

The first generation of diesel electrically controlled fuel injection system is called position control system, which uses electronic servo mechanism (such as linear solenoid, linear DC motor, etc.) instead of mechanical governor to control the position of the oil supply tooth rod (in-line pump) or control the position of the oil spill ring (distribution pump) to achieve the control of fuel injection volume, and the electro-hydraulic actuator controlled by the EUC changes the engine drive shaft.

The phase with the injection pump camshaft or the movement of the control preemptor piston implements the control of the injection time.

The second-generation electronically controlled fuel injection system is called the time control system, compared with the traditional piston pump fuel supply method, it still uses the traditional way to provide high-pressure oil, but in the fuel injection, it is the action of the high-speed solenoid valve installed on the injector controlled by the ECU to control the opening time and time of the fuel injection valve, so as to control the amount and timing of fuel injection more accurately. Because of the use of high-speed solenoid valves, its control accuracy has been greatly improved compared with the first generation of products.

The effects are:

1. It will affect fuel consumption, and will cause excessive carbon deposition due to poor combustion effect in the long term, and there is no adverse effect that directly leads to engine damage in the short term.

2. The failure of the engine emission system will affect the safety of the car during driving and reduce the service life of the engine.

3. Due to the failure of the oil supply system and ignition system during the use of the car, the engine overheats and tempers, resulting in the sintering and spalling of the three-way catalytic converter carrier, and the exhaust resistance increases.

4. There is no basis for the correction of the mixture, resulting in inaccurate computer-controlled fuel injection, or thick or thin, which will affect the engine, three-way catalytic converter, oxygen sensor, etc. for a long time, which is directly reflected in the change of engine power, fuel consumption, idle speed, etc.;

5. Due to the use of fuel or lubricating oil, the catalytic converter is poisoned, the activity decreases, the catalytic conversion efficiency is affected, and the sulfur and phosphorus complexes and deposits are generated in the three-way catalytic converter, which deteriorates the performance of the vehicle, resulting in the decline of power performance, the increase of fuel consumption, and the deterioration of emissions.

Hello, engine emission system failure, this means that your engine burns badly, resulting in the exhaust gas discharged is not up to standard, this may be your three-way catalysis, or your oxygen sensor detection problem.

Ask about engine exhaust system failures.

There are many reasons why the engine fault light turns on this light, so the specific reason needs to be detected by the computer, and the content of the fault code is read to know that the fault point is in**.

The question showed that it was a malfunction in the engine exhaust system.

If the answer is that the engine is faulty, then it is possible that your three-way catalytic blockage or damage to the oxygen sensor is possible. You just indicate that the emission system is faulty in the car, but if he uses the computer to detect it, your engine control computer will record the content of a fault code. Ask questions.

Then there will be a major repair, a new car will appear, and there will be frequent problems in the future.

Today's cars have electronically controlled engines. And there are two ways to control the throttle, one is the cable type and the other is the electronic type. If it is a pull wire type, then the throttle we step on is the control pull wire, and the pull wire is directly connected to the throttle.

If it is electronic, there is a throttle pedal position sensor on the throttle, which receives this signal and controls the size of the throttle opening.

Hello, the accelerator pedal gives the computer a signal, and then the computer gives the throttle signal [car questions, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

The annual inspection needs to be tested for exhaust emissions, and the fire extinguisher is generally 1-2 kg for small cars, and 4 kg for large goods.

There should be, every time I go to test the exhaust gas, the inspector will increase the throttle to let the exhaust gas rush measurement, so every time I go to the road, I will first pull the high speed to let the engine run at high speed and spray the gum in the engine.

1. Automobile aging.

If the vehicle mileage has exceeded 450,000 kilometers or the service life has exceeded 15 years, various parts of the vehicle will have obvious aging, poor contact, poor sealing, insufficient pressure and other phenomena.

2. The three-way catalytic converter fails.

The failure of the three-way catalytic converter is the most important reason for the excessive exhaust gas of automobiles.

The 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.

When the high-temperature automobile exhaust gas passes through the purification device, the purification agent in the three-way catalytic converter will enhance the activity of CO, HC and NOx, and promote it to carry out a certain oxidation-reduction chemical reaction, in which CO is oxidized at high temperature to become colorless and non-toxic CO2 gas;

HC compounds are oxidized to water (H20) and CO2 at high temperatures; NOx is reduced to nitrogen and oxygen. The three harmful gases become harmless gases, so that the exhaust gas of the car can be purified.

3. The engine is not working properly.

The engine may have a lack of cylinders, spark plug leakage oil, oil strings, etc., when the throttle is increased, the engine is not running smoothly and powerfully.

4. The oxygen sensor is damaged.

In the engine that uses a three-way catalytic converter to reduce exhaust pollution, the oxygen sensor is an indispensable element, which is used to detect the concentration of oxygen in the exhaust gas and send a feedback signal to the ECU, and the ECU controls the increase or decrease of the fuel injection volume of the injector, so as to control the air-fuel ratio of the mixture near the theoretical value, so that the fuel combustion is more sufficient.

When the oxygen sensor is damaged, the air-fuel ratio of the mixture deviates from the theoretical air-combustion ratio, so that the purification ability of the three-way catalyst for CO, HC and NOx will drop sharply, the emission will exceed the standard, and the fuel consumption will also increase significantly.

5. The three major systems of the vehicle are dirty (air intake system, exhaust system, fuel system).

This situation is generally that the vehicle is relatively new, but the test results are exceeded, or the exceedance is not serious, only a few percent or tenths of a percent, which shows that the vehicle exhaust treatment system, that is, the three-way catalytic converter and oxygen sensing, does not have a major problem, and the reason for the exhaust gas exceeding the standard may be because the three major systems of the vehicle (intake system, exhaust system, fuel system) are too dirty.

1. Fuel quality, no matter how low-quality fuel is burned, the exhaust gas will exceed the standard.

2. Insufficient fuel combustion. Emissions exceed the standard due to the formation of chemical complexes of sulfur, phosphorus and carbon monoxide produced by incomplete combustion in fuel. These are mainly because of the fuel system|(air intake system, ternary, fuel injector, etc.) or not regularly cleaned.

In the case of poor quality of gasoline, it may cause the exhaust gas of the car to exceed the standard.

The exhaust gas recirculation system is not working properly, and the sensor of the input signal is faulty, resulting in the mixture being too thin.

The ignition time is not accurate. The ignition system lacks fire or ignition energy is insufficient, so that the mixture combustion is not sufficient.

The cylinder pressure is too low, the engine operating temperature is too high, observe whether the engine temperature on the diagnostic instrument is too high.

The conversion efficiency of the three-way catalytic converter is too low, and the secondary air injection system is faulty.

The fuel evaporation system does not work properly, causing the mixture to be too thick.

The secondary air injection system is faulty.

8.Automobile exhaust exceeds the standard is generally related to the accessories of the car, and the aging of the parts is easy to exceed the exhaust gas in this case.