Intelligent gas supply control system for liquefied natural gas (LNG) vehicle

Abstract

The invention discloses an intelligent gas supply control system for a liquefied natural gas (LNG) vehicle. The system comprises an intelligent control unit, a hydraulic oil tank, a hydraulic oil pump, an LNG infusion pump, an LNG bottle, a carburetor, a valve set, a hydraulic pressure sensor, a carburetor back fuel gas temperature sensor, a buffer tank, a buffer tank fuel gas pressure sensor and a buffer tank fuel gas temperature sensor. The intelligent control unit collects the state information of an engine, an LNG bottle liquid level meter as well as all the sensors mounted in the system; the pressure and flow direction of a hydraulic system are controlled by controlling movement of the valve set to drive the LNG infusion pump to pump out LNG liquid from the LNG bottle; and according to the state requirement of the whole vehicle, the working frequency of the LNG infusion pump is controlled, the target pressure of the buffer tank is adjusted or maintained to meet the requirement of the whole vehicle for gas supply, and additionally, the intelligent control unit has the function of fault diagnosis and treatment, so that the effect that the intelligent gas supply control system achieves the safe, efficient, intelligent and energy-saving gas supply purpose is guaranteed.

Description

technical field [0001] The invention relates to a gas supply system for LNG (liquefied natural gas) vehicles, in particular to an intelligent gas supply control system for LNG heavy-duty commercial vehicles. Background technique [0002] At present, the air supply system of LNG commercial vehicles adopts the self-pressurization mode. This type of air supply system has certain limitations, especially for heavy-duty commercial vehicles, there is insufficient air supply for climbing, and the boost pressure needs to be adjusted according to the experience of the driver. Unfavorable factors such as manual adjustment and self-pressurization lead to excessively high cylinder pressure, low cylinder pressure and engine failure to start, the intelligent air supply control system can completely overcome the above shortcomings. Contents of the invention [0003] The invention discloses an intelligent gas supply control system for an LNG vehicle. The system includes: an intelligent con...

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Problems solved by technology

[0002] At present, the air supply system of LNG commercial vehicles adopts the self-pressurization mode. This type of air supply system has certain limitations, especially for heavy-duty commercial vehicles, there is insufficient air supply for climbing, and the boost pressure needs to be adjusted according to the experience of the driver. Unfavorable factors such as manual adjustment and self-pressurization lead to excessively high cylinder pressure, low cylinder pressure and engine failure, etc., the intelligent air supply control system can completely overcome the above shortcomings

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