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Pressure-sensor-free constant-pressure water supply control method

A pressure sensor and constant pressure water supply technology, which is applied in pump control, control system, control generator, etc., can solve the problems of poor control effect and high cost

Active Publication Date: 2020-10-27
上海熠动动力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high cost and poor control effect of the existing pressure sensorless constant pressure water supply control method

Method used

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Embodiment 1

[0039] refer to Figure 1-Figure 2 , a pressure sensorless constant pressure water supply control method of the present embodiment, based on the pump characteristic model established by the three-dimensional curved surface of the lift (pressure) measured by the experimental calibration with respect to the flow rate and rotational speed and the q-axis current of the motor with respect to the flow rate and rotational speed, through The pump characteristic model simulates the feedback of the pressure sensor to achieve the closed-loop constant pressure water supply control without pressure sensor.

[0040] From 0 to the peak speed of the motor at 1000rpm, it is equally spaced into speed vectors N: 0, 100, 200, ..., 1000rpm;

[0041] From 0 to the highest flow rate of 350lpm, it is equally spaced into flow vector Q: 0, 50, 100, ..., 350lpm;

[0042] Take the Q vector as the abscissa and the N vector as the ordinate to establish a test condition matrix, as shown in the following ta...

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Abstract

The invention provides a pressure-sensor-free constant-pressure water supply control method. The method comprises the steps of establishing a flow and flow velocity pump characteristic model; and simulating feedback of a pressure sensor through the pump characteristic model to achieve closed-loop constant-pressure water supply control without a pressure sensor. Through the pressure-sensor-free constant-pressure water supply control method, the pressure sensor is omitted. The system cost is low, and the reliability is good. The current value and rotating speed value fed back by a current sensorand a speed sensor are accurate. Through a constant-pressure control algorithm, response is quick, and the precision is high. The control method is fewer in calibration step, high in speed and capable of being completed within one workday. The lift instruction value can be adjusted at will. Except that constant-pressure control can be realized, the algorithms such as proportional pressure controlcan be realized. Given pressure control over the load of any end can be realized.

Description

technical field [0001] The invention belongs to the technical field of water pump control, in particular to a pressure sensorless constant pressure water supply control method. Background technique [0002] The patent CN105839711A applied by Jiaxing Extreme Transmission Technology Co., Ltd. discloses a pressure sensor-free frequency conversion constant pressure water supply control method, which realizes the function of arbitrarily adjusting the command pressure value at the outlet of the water pump under the condition of no pressure sensor, and avoids a series of problems caused by the use of pressure sensors. problem, which reduces the purchase and maintenance costs of the system and improves the reliability of the system, but this method needs to obtain the power P and frequency F of the current water pump through the frequency converter. If the integrated test equipment is used to obtain the power P, the cost of the system will be increased , if the estimated method is u...

Claims

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Application Information

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IPC IPC(8): F04B49/06H02P21/00
CPCF04B49/06H02P21/0003
Inventor 袁羲鑫潘叶李幸付士俊
Owner 上海熠动动力科技有限公司
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