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Analysis of Single-point Self-priming and Multi-point Direct Injection Automobile Gas Systems

Update:18-03-2021
Summary: The connection between the automobile gas device and the engine intake manifold is a single point, and the engine sucks in gas by itself, so it is ca...

The connection between the automobile gas device and the engine intake manifold is a single point, and the engine sucks in gas by itself, so it is called a single point self-priming type.

It is easy to install and low in price. However, the power will be reduced, which may cause backfire and fire and increase fuel oil.

Its working principle is to supply the mixer through the pressure reducer and then suck the engine through the negative pressure of the engine, so its gas supply is passive, so its power performance should be reduced by about 5-8%.

In the case of urgent refueling, the gas supply will be insufficient, which may cause the phenomenon of backfire and firing. The backfire firing is caused by the detonation of the gas in the intake manifold by electric sparks. Because a mixer is added before the throttle, the flow of air will be reduced when the air enters, so the fuel volume will increase by about 10% when refueling.

The connection between the multi-point direct-injection gas system and the engine is one connection point for each cylinder, and the electronic control system adopts the electronic injection method to control the gas supply, so it is called multi-point direct injection.

Its work is mainly calculated and adjusted by the computer, so its failure rate is very low. The overall performance of the multi-point direct injection type is more stable than that of the self-priming type. All models can be used for installation.

Its working principle is that after the gas is decompressed by the pressure reducer, it is supplied to the high-frequency injection valve and then the computer calculates the amount of fuel required by the engine and controls the injection valve to supply the engine for combustion. Therefore, its supply is very punctual and flexible, so it is dynamic. Much stronger than self-priming. There is no venturi mixer, so there will be no flashback or increased fuel consumption.

Jiaxing Lineng Autogas Equipment Co., Ltd. as the manufacturer of CNG LPG ECU, has been dedicated to LPG/CNG conversion kits production and services, which has the capability of developing their own products.