Technical measures to improve the dynamics of Jinan automobile oil to gas engine
2019-06-06 07:03:27
I. Lean Burning The data shows that at medium speeds, the average effective pressure of the diesel engine is 1. 1 5 MP a , after conversion to a natural gas engine, since the natural gas octane number reaches 130, it is limited by knocking and venting temperature at the theoretical air-fuel ratio.
The effective pressure is generally 0. 9 MP a. If lean combustion is used, the air volume is increased, the exhaust temperature is effectively reduced, and the knocking tendency is weakened, so that the average effective pressure can be increased to 1 to 1 by the pressure increasing technique. 0 5 MP a ensures high power.
In addition, from the perspective of engine efficiency, reliability and durability, lean combustion also has certain advantages. The key to the smooth realization of lean combustion is to make the mixture burn quickly, that is, shorten the development period of the flame and the duration of combustion.
Jinan Automobile Oil changed to gas http://The research shows that the burning speed depends largely on the turbulent movement of the mixture:
1. As the turbulence is intensified, the natural gas is mixed with the air sufficiently, and the added combustion component is increased;
2. Turbulence can cause wrinkles on the surface of the flame, thereby increasing the surface area of ​​the flame and increasing the burning rate.
3. Turbulence can increase the speed of flame propagation and increase the local burning rate. The means of increasing turbulence is mainly to use a pot-shaped combustor structure that is advantageous for reducing the compression ratio and capable of rapidly burning natural gas or changing the shape of the intake port to form a certain intensity of air movement.
Strong turbulent movement to achieve the purpose of rapid combustion.
Second, supercharged intercooling technology In order to compensate for the power loss caused by lean combustion, the turbocharged intercooling technology commonly used in diesel engines is usually used to increase the power of natural gas engines.
Gas supply 1 . Diffuser 2 . Air filter 3 . Intercooler 4 . turbine
The output power of the Jinan automobile oil-to-gas engine is related to the amount of charge per cylinder entering each cylinder. Increasing the inflation density of the intake pipe can increase the power, which is why the turbocharger is widely used. But as the pressure increases, the air temperature at the outlet of the diffuser rises.
High, to some extent, limits the increase in air density. In order to further increase the air density, it is necessary to reduce the temperature of the charge air, and intermediate cooling measures are required. The so-called "supercharged intercooling" is the intake of the cooling water of the engine or the cooling fan on the car.
The cooler 3 (heat exchanger) intercools the pressurized engine intake.
Most of the vehicle engines use air-to-air intercoolers, which are cooled by the ventilation of the radiator. Under normal circumstances, the air temperature can be reduced to about 5 °C. Experiments have shown that at a given boost pressure, the density increases by 3% for every 10 Ω drop in charge air temperature.
At the same air-fuel ratio, the actual power can be increased by about 3. 5 %. Similarly, intercooling technology can also reduce the thermal and exhaust temperatures of the engine at the same rated power and the maximum burst pressure.
Third, the electronic control injection system natural gas composition is complex, coupled with the actual engine operating conditions change, in order to improve the car's power, the exact injection timing of natural gas and the precise injection volume is the key, which must be electronically controlled multi-point gas sequential injection System completion
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