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Method and system for measuring engine fuel flow

A technology of fuel flow and measurement system, which is used in engine testing, relative volume flow measurement, liquid/fluid solid measurement, etc. It can solve the problems of large fluctuation of flow test, slow dynamic response, influence of measurement accuracy, etc., and achieve high stability. , the effect of improving the measurement accuracy

Active Publication Date: 2019-01-01
XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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Problems solved by technology

[0003] In order to avoid the problems that the measurement accuracy of the prior art is significantly affected by the parameters of electronic components, the flow test fluctuates greatly and the dynamic response is slow, the present invention proposes a new fuel flow measurement method and its system implementation

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  • Method and system for measuring engine fuel flow

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0023] Such as Figure 1 to Figure 4 As shown, the hardware system of the present invention mainly includes a low-pass filter circuit, a saturated amplifier circuit and a full positive hysteresis comparison circuit.

[0024] The low-pass filter circuit performs low-pass filter on the input voltage signal, filters out the high-frequency interference signal in the signal, and retains the useful signal.

[0025] Saturation amplification circuit amplifies the filtered voltage signal, because the signal amplitude output by the flow sensor increases with the flow rate, and vice versa, in order to ensure that the signal with a small amplitude can also be amplified to a suitable voltage range, the Amplification of larger amplitude signals produces saturation. Since the flow rate is only related to the time interval of the Start and Stop signals, but not to the ampl...

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Abstract

The invention provides an engine fuel flow measuring method and a system thereof and mainly solves the problems that aero-engine fuel flow is poor in signal accuracy, repeatability and reliability. According to the engine fuel flow measuring method and the system thereof, a low-pass filter and a saturated amplifier are utilized to conduct partial saturated amplification filter on START and STOP signals output by a fuel flow transducer, a totally-positive hysteresis comparator is adopted to convert the signals into square signals, part of disturbance signals in the transducer are eliminated, the processed START and STOP square signals enter a programmable logic device, and the time difference of two signals and the fuel flow are calculated out. The engine fuel flow measuring method and the system thereof have the advantages of being high in fuel flow measuring accuracy, high in stability, good in repeatability and high in reliability and can be used for aero-engine fuel flow calculation.

Description

technical field [0001] The invention belongs to the technical field of aero-engine testing, in particular to a fuel flow measurement method and its system realization, which are used for measuring the fuel flow in engine control and engine test run. Background technique [0002] In aeroengine design, fuel flow measurement is very important, and the flight distance calculation of the aircraft and engine fuel control are all related to it. Fuel flow is the main control quantity of engine control and the main parameter to evaluate the steady-state performance of the engine. The traditional fuel flow measurement method has the disadvantages of large flow test fluctuations, and the measurement accuracy is significantly affected by the parameters of electronic components. Contents of the invention [0003] In order to avoid the problems of the prior art that the measurement accuracy is significantly affected by the parameters of electronic components, the flow test fluctuates gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F9/00G01M15/02G01M15/00
CPCG01F9/001G01M15/00G01M15/02
Inventor 喻鸣毛宁赵建平郝建于正同杨帆
Owner XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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