How does the CNG vehicle work?

• Posted by lineng lineng February 26, 2021 - Filed in Other - #LPG regulator  - 1,242 views

   

  CNG vehicle system is divided into three parts: natural gas circuit, gasoline oil circuit and control circuit.

  The filling station fills the compressed natural gas into the gas cylinder through the filling valve to 20mpa. When natural gas is used as fuel, the manual shut-off valve is opened, and the oil-gas fuel conversion electric switch installed in the cab is turned to the "gas" position. At this time, the natural gas solenoid valve is opened, the gasoline solenoid valve is closed, and the high pressure of 20mp in the gas cylinder The natural gas enters the pressure reducing regulator through the high-pressure pipeline to be decompressed, then enters the mixer through the low-pressure pipeline and the movable valve, and mixes with the air entering through the air filter, and enters the engine cylinder through the carburetor channel for combustion. The pressure reducing regulator is matched with the mixer to produce different vacuum degrees according to the various operating conditions of the engine, automatically adjusting the air supply volume of the pressure reducing regulator, and evenly mixing natural gas and air to meet the use of different engine conditions Claim. The power valve is a device that adjusts the cross-sectional area of ​​the natural gas pipeline, which can adjust the air-fuel ratio of the mixture to achieve the best air-fuel ratio.

  A gasoline solenoid valve is installed in the oil circuit, and the remaining parts remain unchanged. When using gasoline as fuel, the driver turns the oil-gas fuel switch to the "oil" position. At this time, the natural gas solenoid valve is closed and the gasoline solenoid valve is opened. The gasoline enters the carburetor through the gasoline solenoid valve and is sucked into the cylinder for combustion. The fuel switch has three positions. When it is turned to the neutral position, both the oil and gas solenoid valves are closed. This function is specifically used to switch from gasoline to natural gas when the remaining gasoline in the carburetor room is burned to avoid occurrence. The phenomenon of mixed combustion of oil and gas.

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