The Remaining Amount Measurement System Of LNG In Dual Fuel Engines

Measurement of LNG(liquefied natural gas) the remaining amount is the main content of diesel dual-fuel engine-LNG vehicle fuel supply system,and important. Because LNG cryogenic storage and other features, it is difficult to measure the remaining amount of LNG. This topic using weighting method, conducted LNG remaining amount measurement system. Through the system can quickly and accurately measure the remaining amount of LNG.. The main contents of this paper include the following aspects.(1) This paper introduces the principle of the remaining quantity measurement system and dynamic weighing model. The characteristics of the remaining quantity structure, principle of resistive strain gauge and the principle and characteristics of the strain sensor are also analyzed in this paper. Dynamic weighing technology is adopted to establish model of residual quantity measurement system.(2) Design hardware for the system, which is consists of five elements: power supply system, bridge incentive, amplifying circuit, sampling circuit and the central processing circuit. Different input signals can be produced through the op-amp instrument AD8551. The output signals are produced by the microcontroller.(3) The software of the LNG surplus quantity measurement system is also designed in this paper.CAN transmission is adopted to send the collected signals to the PC in the signal transmission part. The software uses the A/D converter, the CAN communication program and the filter program to deal with the signals of the two pressure sensors.This paper has established a complete LNG surplus quantity measurement system through modeling and designing hardware and software. The test results show that the LNG measurement system designed can monitoring LNG surplus amount under different conditions quickly and accurately. This system meets the accuracy requirements of the dual fuel engine LNG surplus quantity measurement very well, and carries out the preliminary exploration for LNG dual fuel engine remaining quantity measurement.