High-pressure direct-injection natural gas engine gas inlet pressure stabilizing device based on variable coherent wavelength

Abstract

The invention discloses a high-pressure direct-injection natural gas engine gas inlet pressure stabilizing device based on the variable coherent wavelength. The device comprises a natural gas pressureadjusting unit, a temperature sensor, a buffer tank, a buffer tank stop valve, a 1 / 4 wavelength pipe assembly, a pressure sensor, a second high-pressure natural gas pipeline and a 1 / 4 wavelength pipeeffective length adjusting device. The first high-pressure natural gas pipeline is sequentially provided with the natural gas pressure adjusting unit, the temperature sensor, the second high-pressurenatural gas pipeline, the 1 / 4 wavelength pipe assembly and the pressure sensor. One end of the second high-pressure natural gas pipeline is connected with a side opening of the first high-pressure natural gas pipeline, and the other end of the second high-pressure natural gas pipeline is connected with the buffer tank. The buffer tank stop valve is arranged on the second high-pressure natural gaspipeline. Multiple 1 / 4 wavelength pipes are arranged in the 1 / 4 wavelength pipe assembly, and each 1 / 4 wavelength pipe is connected with the side opening of the first high-pressure natural gas pipeline. The length of each 1 / 4 wavelength pipe connected into the first high-pressure natural gas pipeline is controlled through the 1 / 4 wavelength pipe effective length adjusting device.

Description

technical field [0001] The invention belongs to the field of in-cylinder high-pressure direct-injection natural gas engines, in particular to a high-pressure direct-injection natural gas engine intake voltage stabilizing device based on a variable coherent wavelength. Background technique [0002] Particulate emissions from heavy-duty diesel vehicles account for more than 70% of commercial vehicle particulate emissions, and are one of the important pollution sources in large-area foggy weather. The main component of natural gas is methane, and the combustion produces less soot. Using natural gas as fuel for heavy-duty vehicles can reduce harmful emissions and improve the environment. In-cylinder high-pressure direct-injection natural gas engine injects natural gas into the cylinder in the form of high pressure, and adopts the diffusion combustion method, which eliminates the limitation of knocking and improves the thermal efficiency of the natural gas engine. In order to pr...

AI Technical Summary

Problems solved by technology

Due to the problem of large pressure fluctuations in the pressurization process of the plunger pump, there are pressure fluctuations in the high-pressure gas circuit. This fluctuation reduces the measurement accuracy of the flowmeter and cannot accurately measure the gas consumption rate, making the actual injection volume of natural gas and the theoretical There is a certain difference in the injection quantity, which reduces the control accuracy of the electronic control system and affects the combustion and emission of the engine.

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