Gas dispensation automatic control method and liquefied natural gas vehicle gas dispenser

Abstract

The invention relates to a gas dispensation automatic control method and a liquefied natural gas vehicle gas dispenser. The gas dispenser comprises a pipeline system and a control system, wherein the pipeline system comprises a liquid inlet pipeline system and a gas return pipeline system; the liquid inlet pipeline system comprises an added liquid mass flowmeter, a gas dispensation hose and a gas dispensation gun; the gas return pipeline system comprises a gas return hose, a pressure regulating valve and a return gas mass flowmeter; a first control valve is arranged between the added liquid mass flowmeter and the gas dispensation hose, and a pressure transmitter is arranged between the pressure regulating valve and the gas return hose; and the control system comprises a judging and executing unit and is used for controlling the on-off of the first control valve according to a signal of a return gas mass flowmeter or the pressure transmitter. The invention realizes the automatic control of the gas dispenser through setting the judging and executing unit, avoids the excess filling of a vehicle-mounted low-temperature gas bottle, solves the problem of pressure jump in the gas bottle, which is brought by excess filling, to ensure that the pressure in the vehicle-mounted low-temperature gas bottle can be controlled after gas dispensation and guarantees the running safety and reliability of the vehicle-mounted low-temperature gas bottle.

Description

technical field [0001] The invention relates to a gas filling method and equipment for liquefied natural gas vehicles, in particular to an automatic gas filling control method for a liquefied natural gas vehicle gas filling machine and a liquefied natural gas vehicle gas filling machine. Background technique [0002] Liquefied natural gas (LNG for short) is a kind of clean fuel for vehicles. In today's era of soaring oil prices, it has become an indispensable alternative energy source for vehicle fuels. At present, most domestic liquefied natural gas refueling machines adopt such as Chinese patent ZL200720176344.3, and the authorized announcement date is September 10, 2007. Cold circulation system, and when the gas dispenser is in working condition, the inlet liquid mass flowmeter and the return air mass flowmeter count separately, which improves the measurement accuracy and accurately calculates the trade accounting between the gas filling station and the customer. But abo...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a device with automatic gas filling control for the problems existing in the existing liquefied natural gas vehicle gas filling machine, which can protect the vehicle-mounted low-temperature gas cylinder, so that gas filling station users and vehicle users can LNG vehicle filling machine with good economy and operation safety

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