Supply pressure adjusting device

Abstract

The invention discloses a supply pressure adjusting device, and belongs to the technical field of automobile engines. A control shell is arranged at the end, close to an energy storage cavity, of a valve body in a sealed mode, and a pressure medium inlet, the energy storage cavity and a pressure medium outlet which are communicated are formed in the control shell. A gas inlet cavity, a first installation cavity and a second installation cavity are sequentially and coaxially arranged in the valve body, the outer circumferential face of a pilot valve element and the inner circumferential face of the second installation cavity are matched in a sealed mode, a gas pressure adjusting cavity is separated, and stop valves are arranged at the pressure medium inlet and the pressure medium outlet of the control shell. According to the control strategy, the stop valves of the pressure medium inlet and the pressure medium outlet are rapidly controlled, a pressure medium is supplemented or released for the energy storage cavity storing the pressure medium, therefore, the pressure adjusting response is fast, the control precision is high, the pressure adjusting range is wide, and the pressure difference range of the energy storage cavity and the gas pressure adjusting cavity can be freely and accurately adjusted.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a supply pressure regulating device. Background technique [0002] Dual-fuel engines use dual-fuel pressure regulators for fuel control. The dual fuel pressure regulating device includes a liquid fuel pressure regulating module and a gaseous fuel pressure regulating module, and realizes regulating the gaseous fuel by controlling the pressure of the liquid fuel. [0003] At present, the dual-fuel pressure regulating device (one liquid fuel and one gas fuel, generally natural gas and diesel oil), the liquid fuel pressure regulating module uses high-pressure liquid fuel as the control pressure medium, through the gas fuel pressure regulating module, obtains the predetermined Pressure gas fuel. For the liquid fuel pressure control module, one type of regulating device is controlled by an outlet return valve, and the other type of regulating device uses an orifice and an ...

AI Technical Summary

Problems solved by technology

For the liquid fuel pressure control module, one type of regulating device is controlled by an outlet return valve, and the other type of regulating device uses an orifice and an overflow valve to regulate the pressure of liquid fuel, and there is a delay in the pressure regulation of the control medium , so the pressure adjustment response is slow, the control accuracy is not high, and the pressure control of gas fuel relies on liquid fuel regulation, it is difficult to match the engine using pure gas fuel

Images