Digital airborne fuel oil measurement and control system

A technology of fuel measurement and control and oil quantity, which is applied in the general control system, control/regulation system, computer control, etc., and can solve the problem of insufficient peripheral interfaces of the DSP control system, complicated CPU peripheral interface circuits, and expensive measurement system chips, etc. problem, to achieve the effect of volume reduction, low cost, and cost reduction

Inactive Publication Date: 2019-06-07

四川泛华航空仪表电器有限公司

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AI-Extracted 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...

Method used

Single-chip microcomputer STM32 has selected the STM32F103ZGT6 of ST company. The chip has a 32-bit embedded RISC architecture processor core of ARM CortexTM-M3, integrates 1MB of Flash and 96KB of SRAM, and integrates 12-bit A/D and 12-bit D/A on-chip analog signal processin...

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.

Application Domain

Measurement devicesComputer control +2

Technology Topic

VIT signalsFuel oil +10

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Experimental program(1)

Example Embodiment

[0018] figure 1 It shows a block diagram of the circuit principle of a digital airborne fuel measurement and control system of the present invention. The digital airborne fuel measurement and control system of the present invention, a digital airborne fuel measurement and control system, includes a sensor signal processing circuit, a communication drive circuit, a photoelectric isolation circuit, and a fuel quantity signaler, and is characterized in that it also includes a single-chip microcomputer STM32. The single-chip STM32 is electrically connected to the sensor signal processing circuit for processing and calculating the fuel temperature, fuel volume, and consumption, and the communication drive circuit for communicating with the host computer. The single-chip STM32 is connected to the digital input and output control circuit. Programming logic CPLD, said programmable logic CPLD is connected through a photoelectric isolation circuit to transmit the zero adjustment and full signal of the airborne fuel, the fuel quantity signal device that transmits the fuel pump control valve signal and the fuel pump control valve signal.

[0019] Further, the sensor signal processing circuit includes a temperature signal processing circuit that receives a temperature sensor signal, an oil volume sensor signal processing circuit that receives a fuel volume sensor signal, and a consumption sensor signal processing circuit that receives a consumption sensor signal.

[0020] Further, the communication drive circuit includes an ARINC429 drive circuit, an RS232 drive circuit and an RS422 drive circuit, which are electrically connected to the STM32 microcontroller, as well as a controller area network CAN drive circuit, a JTAG download circuit and a USB communication drive circuit.

[0021] Further, it also includes a power conversion circuit. The power conversion circuit converts the 27V on-board power supply into ±15V and 5V required by the system, and converts the 5V into the 3.3V power supply and temperature required by the programmable logic device CPLD through the secondary power conversion circuit. The 4.5V voltage regulator required by the signal processing circuit.

[0022] Further, a bus connection is adopted between the single-chip microcomputer STM32 and the programmable logic device CPLD.

[0023] Further, the data storage circuit includes the use of FSMC to expand external SRAM and memory FLASH.

[0024] The whole system uses the single-chip microcomputer STM32 as the control core, and uses the programmable logic device CPLD to control the input and output digital quantities; among them: the single-chip microcomputer STM32 is connected to the programmable logic device CPLD through the bus, and the flexible static memory controller FSMC is used to expand the memory SRAM and flash FLASH performs data storage.

[0025] The one-chip computer STM32 chooses ST company STM32F103ZGT6. The chip has an ARM CortexTM-M3 32-bit embedded RISC architecture processor core, integrated 1MB Flash and 96KB SRAM, and integrated 12-bit A/D and 12-bit D/A on-chip analog signal processing unit, . At the same time, the product integrates 12-bit A/D and 12-bit D/A on-chip analog signal processing units, which can facilitate on-chip analog signal processing. In addition, the chip also provides many external interfaces, such as: USB, CAN, UART , SDIO, SPI, etc.

[0026] The programmable logic device CPLD device chooses XC95144XL and XC95144XL of Xilinx Company. The above CPLD device chip uses 3.3V power supply, which is the same as the STM32 single-chip microcomputer, which helps simplify the power supply of the controller. The logic delay time between pins is 5ns, the maximum clock frequency of the system can reach 178MHz, and there are 3200 available logic gates inside.

[0027] Refer to figure 2 , Here we take full advantage of the abundant advantages of the STM32 signal peripheral interface of the microcontroller. The STM32 signal peripheral interface of the single-chip microcomputer is expanded with 1 RS232 drive circuit for serial download of the program, 2 RS422 drive circuits for communication with the upper computer and ground detection equipment, and 1 SPI port of the single-chip STM32 is expanded by 1 Road ARINC429 communication, reserved 1 controller LAN CAN interface and 1 standby USB interface.

[0028] In terms of signal processing, after the pre-processing, the temperature signal processing circuit inputs the analog signal of the temperature sensor to the internal 12Bit analog-to-digital conversion module A/D of the single-chip microcomputer STM32, converts it into a digital signal and transmits it to the single-chip microcomputer STM32. The consumption sensor signal processing circuit preprocesses the frequency signal of the consumption sensor and inputs it to the input capture pin of the timer TIM1 of the STM32 of the single-chip microcomputer. The timer TIM1 measures the frequency of the input signal and converts it. Consumption value: The signal processing circuit of the fuel sensor uses a digital bridge, which is converted to a digital value through an external digital-to-analog conversion module D/A and transmitted to the single-chip microcomputer STM32 via a data bus interface.

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InactiveCN104306018Areduce volumeeasy to wear

Owner:CHONGQING UNIV OF TECH

Classification and recommendation of technical efficacy words

reduce volume
low cost

Digital airborne fuel oil measurement and control system

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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