Portable online flow resistance tester

Abstract

The invention discloses a portable online flow resistance tester. The tester comprises a housing, an STM32 main control panel, a data acquisition card, an RS485 to TTL module, an LCD touch screen, a differential pressure sensor, a flow sensor, a 24V lithium battery, a 24V to 5V voltage reduction module, a power control unit and an infrared remote controller; the differential pressure sensor and the flow sensor are connected to a data acquisition card interface by use of data signal wires; the data acquisition card is connected with the STM32 main control panel by use of the RS485 to TTL module; the STM32 main control panel is connected with the LC touch screen by use of a display driver circuit and connected with the power control unit by use of a signal control port. The portable online flow resistance tester is convenient to operate and convenient to carry; the tester is capable of realizing long-distance signal transmission, and has extremely high shock resistance and impact resistance, and good noise interference; as a result, the measurement accuracy is improved, the error is reduced, the power consumption is low, and the online measurement endurance time is long.

Description

technical field [0001] The invention relates to the technical field of differential pressure testing of fluid systems, in particular to a portable online flow resistance tester. Background technique [0002] At present, the flow resistance tests of various components such as filters in the fuel system are mainly concentrated in laboratory tests. In the pre-development process of the product, the actual road test of the product is essential, and the data such as the pressure difference and flow rate of the filter in the fuel system are important basic basis in the product development process, so that a more reasonable product design can be made Program. Flow resistance is a very important performance index on the filter. At present, many methods are used to measure the flow resistance of the filter in actual road tests, but none of them are very ideal. [0003] The main problem that prior art exists is: [0004] 1. The traditional flow resistance tester is too large to be ...

AI Technical Summary

Problems solved by technology

[0004] 1. The traditional flow resistance tester is too large to be installed in the vehicle for online testing;

[0005] 2. The pressure sensor is controlled by the atmosphere and is easily affected by altitude and ambient temperature;

[0006] 3. In the measurement of the low-pressure oil circuit of the fuel system, due to the slow pressure change, the amplitude of the voltage signal or current signal of the pressure sensor is small. When passing through the signal amplifier, it is prone to distortion or loss, which cannot meet the measurement accuracy requirements;

[0007] 4. Due to the use of two pressure sensors, when calculating the pressure difference, the measurement error of each pressure sensor is different, resulting in a large error in the final pressure difference measurement result;

[0008] 5. When measuring the differential pressure of multiple components in the fuel system, too many pressure sensors need to be added, resulting in too large equipment and high power consumption, which is not conducive to online measurement

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