Storing device for liquefied gas fuel

Abstract

A plan for the liquid gas fuel used storage device which can increase the storage amount of the liquid gas fuel, and it can steadily press and provide the liquid gas to the engine. The time the device presses and provides the liquid gas fuel used feed pump (25) in the first storage box (2A) to the engine (50) the device uses the fuel feeding device to feed the liquid gas fuel in the second storage box (3A, 4A) to the first storage box (2A) by means of the feeding line (K1, K2) along with the consumption of the liquid gas fuel in the first storage box (2A). As the composition can increase the storage amount of the liquid gas fuel the device can prolong the sustaining distance of the vehicle. Besides, the device can steadily and accurately convey the liquid gas fuel as the liquid gas fuel which is pressed and provide to the engine (50) is restricted to be only the fuel stored in the first storage box (2A).

Description

technical field [0001] The present invention relates to a storage device for liquefied gas fuel which stores liquefied gas fuel used as vehicle fuel and pressurizes the liquefied gas fuel to an engine. Background technique [0002] As exhaust regulations have been strengthened in recent years, vehicles using LPG (Liquefied Petroleum Gas) or DME (Dimethyl Ether) as fuel for the purpose of reducing pollution tend to increase. In particular, DME is valued because of its high cetane number and extremely low emission of PM and NOx. [0003] As a device using DME as fuel in this way, for example, as in Patent Document 1, a configuration has been proposed in which, among the DME fuel pressure-fed from the fuel tank to the engine, once the fuel remaining when the engine is stopped is sent to the purge tank Returned and depressurized, then sent to the fuel tank. This is because the DME fuel is pressure-fed from the fuel tank to the engine at high pressure, so it is depressurized in...

AI Technical Summary

Problems solved by technology

Therefore, in practice, the storage amount of the liquefied gas fuel in each storage tank cannot be equalized, resulting in uneven consumption of the liquefied gas fuel, and there is a problem that the liquefied gas fuel pressure-fed to the engine tends to become unstable.

[0009] In addition, in the feed pump for pumping the liquefied gas fuel to the engine, a pump and a motor for pumping the liquefied gas fuel at a relatively high pressure are required, and an inverter for controlling the discharge amount is required. With these parts installed, the weight becomes heavy

Therefore, as described above, in a structure in which a plurality of storage tanks are loaded and a charge pump is arranged in each storage tank, the fuel consumption thereof deteriorates due to an increase in the weight of the vehicle as a whole

In addition, since the feed pump is a component with the above functions, its own purchase cost or manufacturing cost is relatively high, and the cost also increases accordingly.

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