Natural gas control system and vehicle

Abstract

The invention provides a natural gas control system. The natural gas control system is used for providing natural gas for an engine of a vehicle and comprises a natural gas bottle, a liquid outlet pipe and a vaporizer; the natural gas bottle comprises a gas bottle outer layer and a gas bottle inner layer arranged in the gas bottle outer layer; a first heating device is arranged in the gas bottle inner layer; a second heating device is arranged between the gas bottle inner layer and the gas bottle outer layer; one end of the liquid outlet pipe is arranged between the gas bottle inner layer and the gas bottle outer layer; one end of the vaporizer is communicated with the other end of the liquid outlet pipe; and the other end of the vaporizer is communicated with the engine. According to the natural gas control system of the structure, control over the pressure and the temperature of natural gas is carried out, and liquid-state LNG, in low saturation status, provided by a gas station is converted into LNG in high saturation temperature status, and therefore the gas supply need of the engine is met. In addition, the invention further provides the vehicle comprising the natural gas control system.

Description

technical field [0001] The invention relates to the field of LNG vehicles, in particular to a natural gas control system and a vehicle. Background technique [0002] With the continuous development of related technologies, there are more and more engineering vehicles using LNG (liquefied natural gas) as fuel. However, because there is no uniform saturation standard for LNG fuel supplied by domestic gas filling stations, the saturation of LNG There are large differences, some with higher saturation and some with lower saturation. [0003] It can be seen from the relationship between LNG and saturation temperature and saturation pressure (as shown below), when the saturation temperature is lower, its saturation pressure is also lower, which is more beneficial to storage and transshipment, but for the engine, if the LNG When the saturation is low, the air supply pressure will be unstable, resulting in the inability to meet the working needs of the engine. [0004] LN...

AI Technical Summary

Problems solved by technology

[0006] First of all, during the operation of the vehicle, under the action of the low saturation LNG liquid, the gas phase pressure in the bottle is unstable and drops rapidly;

[0007] Secondly, because the gas phase pressure in the bottle is unstable and the liquid outlet diameter remains unchanged, the liquid output of the self-pressurization system is unstable; at the same time, the liquid supply and output flow are unstable;

[0008] Thirdly, the flow rate of the liquid supply is unstable, and the liquid phase in the bottle is low-saturated LNG, the pressure is low after the phase change, and the flow rate is unstable, making the gas supply volume uncontrollable and the gas supply pressure unstable

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