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List of the catalog of this article:

• 1, Engine problems, what are the factors that affect the inflation efficiency?
• 2, The higher the inflation efficiency, the more ___ the amount of fresh gas entering the cylinder, and the power emitted by the engine is...
• 3 、The impact of the air exchange process on the engine indication performance index
• 4, What is the inflation efficiency of the engine
• 5, What does inflation efficiency mean?

Engine problems, what are the factors that affect the inflation efficiency?

There are many factors that affect the inflation efficiency of automobile engines. Here are some common reasons: filter problems: air filter in the engine intake systemThe purifier may be affected by dust, particulate matter, insects and other impurities, thus blocking the air flow and reducing the engine inflation efficiency.

The ratio of the mass of the fresh workpiece that actually enters the cylinder in each cycle and the quality of the fresh workpiece filled with the working volume of the cylinder in the intake state. Main factors: resistance of the intake system; resistance of the exhaust system; the degree of heating of fresh filling; timing of gas distribution; compression ratio; intake state.

Gas timing: Reasonable gas timing can increase ηv; intake state: the intake temperature Ts increases, ηv increases, the intake pressure Ps decreases, and Pa decreases accordingly, and the ratio of Pa/Ps is basically unchanged, which has little impact on ηv.

The higher the inflation efficiency, the more ___ the amount of fresh gas entering the cylinder, and the power emitted by the engine is...

1. The higher the inflation efficiency, indicating that the more fresh air or combustible mixture entering the cylinder, the greater the heat that the combustion mixture may emit, and the more power the engine Big. For engines with a certain volume (V), the mass is related to the T and P at the end of the intake. The lower the T and P of the intake, the greater the intake mass and the higher the inflation efficiency.

2. The higher the inflation efficiency, the greater the mass of fresh filling into the cylinder, the greater the heat that may be released when the combustion of the combustible mixture, and the greater the power emitted by the engine. The gas distribution mechanism can be classified from different angles.

3. The thrust on the column is gradually reduced, and the opening of the valve gradually decreases under the action of spring tension until it finally closes.During the compression and work stroke, the valve is tightly closed under the action of spring tension. The valve is side-mounted. The intake valve, exhaust valve and valve are all installed on one side of the cylinder block.

The impact of the ventilation process on the performance indicators of the engine

The ventilation of the automobile has a great impact on the engine, as follows: the working surface of the engine valve and the valve will be burned, resulting in the engine valve If the gap is too small, it will affect the operation of the engine. Spark plugs are easy to damage. Because the combustion temperature of natural gas is high, it is particularly easy to pierce the spark plug.

First of all, it has a great impact on the safety of cars. Due to the need to add gas storage tanks in the vehicle, the weight of the vehicle itself has increased and the storage space of the vehicle has also been reduced. The combustion of natural gas in the car will cause premature wear of the engine and damage the fuel injection system after ventilation.

Noise not only affects the noise of the whole vehicle, but also the noise in the car, which has a great impact on the comfort of the ride. The design of the air intake system directly affects the power and noise quality of the engine, and is related to the ride comfort of the whole vehicle. Reasonable design of sound-ansing components can reduce the noise of the subsystem, thereby improving the NVH performance of the whole vehicle.

What is the inflation efficiency of the engine

The inflation efficiency is the ratio of the fresh charge that actually enters the cylinder and the fresh charge that fills the working volume of the cylinder in the intake state, which reflects the perfection of the internal combustion engine intake process.

Refers to the theoretical air quality ratio of the fresh air quality actually inhaled by the engine cylinder and the working volume of the cylinder in the intake duct state in each working cycle of the internal combustion engine.

The inflation efficiency, that is, the filling coefficient, refers to the ratio of the fresh air quality of the actual inhaled cylinder in the engine cylinder and the theoretical air quality of the working volume of the cylinder in the intake channel state in each working cycle of the internal combustion engine. The inflation efficiency of the internal combustion engine reflects the perfection of the air intake process, which is an important indicator to measure the air intake performance of the engine.

Inflation efficiency refers to the ratio of the amount of fresh air actually entering the cylinder and the amount of theoretical fresh air during the combustion process of the engine.

ηv can be measured by the test method. The engine inflation efficiency is generally: gasoline engine: ηv= 0.75~0.85 Diesel engine: ηv= 0.75~0.90 Factors affecting inflation efficiency Factors affecting inflation efficiency include intake state and air intake end state Pressure, temperature, exhaust gas residual coefficient, compression ratio, etc.

Inflation efficiency-q = the mass of the fresh amount of fresh air in the actual air intake cylinder / the mass of fresh air volume filled with the working volume of the cylinder in the intake state. The so-called intake state refers to the state of gas in the intake pipe after the air filter.

What does inflation efficiency mean?

1. If the late closing angle is 40°, the inflation efficiency hv reaches the highest value at a rotational speed of about 1800r/min, indicating that working at this rotational speed can make the best use of the inertia of the airflow to inflate.

2. Continuous variable valve timing refers to changing the moment and time length of air intake opening and closing at the end of the camshaft. The advantages and disadvantages of cvvt engine are as follows: Advantages: Increase the inflation; the different speeds of the engine correspond to different intake valve positions to improve the inflation efficiency. At low speed, the air flow rate is low, and the intake valve should be opened early.

3. The number "4" refers to the displacement of each cylinder in the engine, the unit is liter (L), and "t" refers to turbocharging technology (Turbocharging) means that this engine uses a turbocharger to improve the efficiency of cylinder inflation, thereby increasing the output power of the engine.

4. Double VVT-i engine is the English abbreviation of Toyota's intelligent variable valve timing system. The engine of the latest Toyota sedan has been generally equipped with the VVT-i system.

5. VVT (Variable Valve Timing) variable valve timing system. The system adjusts the phase of the engine cam through the equipped control and execution system, so that the time of opening and closing the valve changes with the change of engine speed, so as to improve the inflation efficiency and increase the engine power.

6. It will also lead to the loss of engine power. Therefore, cars equipped with small displacement engines are not necessarily slower or worse in performance than cars equipped with high-power engines.Ways to improve engine power (1) improve thermal efficiency; (2) improve inflation efficiency; (3) high speed; (4) improve mechanical efficiency.