Gas pressure regulator for regulating the pressure of a gaseous fuel, system for supplying an internal combustion engine with gaseous fuel using such a gas pressure regulator, and method for operating the system

Abstract

The invention relates to a gas pressure regulator (1) for regulating the pressure of a gaseous fuel, said gas pressure regulator having a housing (2) in which a gas piston (3) movable longitudinally is arranged ), the gas piston delimits a gas chamber (5) and delimits a pressure chamber (7) that can be filled with a working fluid, wherein the gas piston (3) has a first seal (24) surrounding its outer side, The gas piston (3) is guided sealingly on the housing (2) by means of the first seal and the first seal seals the gas chamber (5). The cooperation of the gas piston (3) and the valve seat (21) forms an overflow valve (20), via which gas can be led out of the gas chamber (5). A second circumferential seal (25) is formed on the outside of the gas piston (3), by means of which the gas piston (3) is likewise guided in a sealing manner in the housing (2) , wherein the gas piston (3) is at least partially surrounded by a low-pressure gas chamber (9), and the second seal (25) separates the low-pressure gas chamber (9) from the gas return chamber (10) , wherein the gas chamber (5) can be connected to the gas return chamber (10) through the overflow valve (20). The invention also relates to a system for supplying an internal combustion engine with gaseous fuel, the system having an intermediate tank (200) and such a gas pressure regulator (1). Furthermore, in a method for operating the system there is a return accumulator ( 300 ), the pressure of which is set between the pressure in the gas chamber ( 5 ) and the pressure in the gas tank ( 100 ).

Description

technical field [0001] The invention relates to a gas pressure regulator for regulating the pressure of a gaseous fuel, as the gas pressure regulator is used to supply a gaseous fuel at a predetermined pressure to an internal combustion engine. Furthermore, the device relates to a system for supplying a gaseous fuel to an internal combustion engine using such a gas pressure regulator and a method for operating the system. Background technique [0002] A gas pressure regulator for supplying an internal combustion engine with gaseous fuel at a certain pressure is known from the prior art, for example from DE 10 2016 207 743 A1. Such systems have a gas tank from which gaseous fuel is removed by means of a gas pump. The gas pump compresses gas and supplies it to the intermediate tank. A further gas accumulator, the so-called gas rail, is fed from the intermediate tank, in which the gaseous fuel is maintained at a predetermined pressure in order to be finally introduced into th...

AI Technical Summary

Problems solved by technology

Sealing against one another with high pressure differences of several hundred bar is technically very complex and such gas pressure regulators are correspondingly expensive and reduce the efficiency of the entire system

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