Digital airborne fuel oil measurement and control system

Abstract

The invention discloses a digital airborne fuel oil measurement and control system which comprises a sensor signal processing circuit, a communication driving circuit, a photoelectric isolation circuit and an oil quantity signaling device. The system is characterized by also comprising a single-chip microcomputer STM32, the single-chip microcomputer STM32 is electrically connected with the sensorsignal processing circuit for processing and calculating the fuel oil temperature, oil quantity and oil consumption and the communication driving circuit communicated with a host computer, the single-chip microcomputer STM32 is connected with a CPLD (Complex Programmable Logic Device) for controlling the input / output digital quantities, and the CPLD is connected with the oil quantity signaling device, for transmitting zero and full adjusting signals and oil exhausting and full signals of the airborne fuel oil, via the photoelectric isolation circuit, and transmits a control valve signal of a fuel pump. Based on STM32 and CPLD combined control configuration, a digital bridge is used to measure the fuel oil, and thus, the size is small, development is simple, the cost is low, and a lot of peripheral interfaces are included.

Description

technical field [0001] The invention relates to a fuel oil measurement and control system, in particular to a digital airborne fuel oil measurement and control system for an aircraft. Background technique [0002] The fuel measurement and control system is a subsystem of the aircraft fuel system. Its function is to provide fuel reserve information and engine fuel consumption information. It is one of the basic function guarantee systems of the aircraft. Due to large fuel measurement errors and fluctuations caused by attitude changes during aircraft flight, the accuracy of fuel measurement is required to be high; especially the sensors, cables, and annunciators of the fuel measurement and control system are installed in the fuel tank and enter the fuel tank. Maintenance is very difficult, therefore, the requirements for maintenance-free are also very high. After more than half a century of development, although the measurement accuracy of the fuel measurement and control sys...

AI Technical Summary

Problems solved by technology

With the development of advanced aircraft control technology and the needs of digital fuel system management, the airborne digital fuel measurement and control system has become an inevitable trend of development. At present, the airborne digital fuel measurement and control system mainly adopts the control architecture combining DSP and FPGA. The measurement system chip of the architecture is more expensive, and the system volume is relatively large; because the algorithm involved in fuel measurement is relatively simple, using DSP for data processing seems to be a waste of resources, and the CPU peripheral interface circuit is more complicated. At the same time, the peripheral of the DSP control system The interface is not rich enough, and the function expansion of the system is mainly realized by FPGA, so the number of gates of the FPGA chip selected in this way increases, which brings about the increase of system cost

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