A liquid level detection and control device and method

Abstract

The invention provides a liquid level detection and control device and method used for solving the problems that ripple fluctuation, contact bouncing and other common abnormal work conditions in practice severely affect normal work of a liquid level switch. The liquid level detection and control device comprises a float switch, an inflowing water pressure sensor, an amplitude and frequency sensor, a pulse width mode setting unit and a liquid level control unit, wherein the float switch and pulse width mode setting unit are connected with the liquid level control unit; the amplitude and frequency sensor and the inflowing water pressure sensor are connected with the pulse width mode setting unit; the liquid level control unit is used for receiving first signals and pulse width signals input by the float switch, eliminating signal fluctuation of the float switch according to pulse width signals to acquire second signals and controlling water inflowing or discharging according to the second signals. Electrical signal fluctuation, caused by liquid level fluctuation, of the float switch can be eliminated through the pulse width signals, accordingly, the liquid level state can be recognized accurately, and influence of liquid level fluctuation on liquid level control is eliminated.

Description

technical field [0001] The invention relates to communication technology / computer technology, in particular to a liquid level detection and control device and method. Background technique [0002] The transformation of protected agricultural production mode is an important part of the innovation and development of agricultural modernization in my country. In recent years, Chinese protected horticulture has achieved rapid development. Vegetable production is an important part of protected horticulture, and the integration of water and fertilizer is the key technology of current protected vegetable production. Compared with the traditional extensive water and fertilizer application method in our country, the integrated water and fertilizer utilization technology is to fertilize and water through the irrigation system, and the crops absorb nutrients while absorbing water. It is widely used in agricultural production by developed countries such as Europe and the United States b...

AI Technical Summary

Problems solved by technology

However, after long-term and large-scale practice, it is found that when adding water to the fertilizer tank and the liquid return tank, it will lead to some common adverse conditions in practice, such as water ripple fluctuation and contact vibration, and the above water ripple fluctuation and Contact vibration will seriously affect the normal operation of the liquid level switch, causing the liquid level to overflow or the liquid level to be too low, causing the pump to run idly

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