Anesthesia machine and respirator proportion valve flow pushing and fondling control method

Abstract

An anesthesia machine and respirator proportion valve flow pushing and fondling control method is disclosed. A flow value corresponding to a proportion valve opening control curve is stored in a read-write memory of a controller. A flow sensor and a proportional valve are formed a PID control system. A feedback control flow velocity is calculated through adjusting a PID control parameter. A size of the opening of the proportional valve is determined through inquiring a flow velocity value corresponding to the corresponding proportion valve opening control curve in the memory. And the flow sensor is used to perform monitoring and cyclical feedback. The PID control parameter is set classifiedly for different needed control flow. The parameter in each classification is smoothly transited through a linear fit mode. During controlling the small flow under 10LPM, an adjustable short-time large current shock is added at starting time of establishing the required flow from the 0LPM. The short-time large current is used to burst through a valve core in the proportional valve so as to realize rapid adjusting of the proportional valve.

Description

technical field [0001] The invention provides a new high-speed and precise flow control method for the proportional valve flow control device of the anesthesia machine and ventilator, which can be used for the control of the flow rate of the inspiratory proportional valve of the anesthesia machine and the ventilator, and can be used for the air-oxygen mixing control of the ventilator , which can also be used for high-speed and precise control of electronic flowmeters in anesthesia machines, and belongs to the technical field of medical equipment manufacturing. Background technique [0002] Anesthesia machines and ventilators are used for surgical anesthesia or replacement, and help patients complete their breathing to maintain life. The size and ratio of the intake air need to be controlled by a proportional valve. Therefore, the measurement of the flow sensor and the control accuracy of the proportional valve directly affect the working performance of the anesthesia machine...

AI Technical Summary

Problems solved by technology

The disadvantage is that the same PID control parameters cannot be well applied to the large-scale production of the same type of proportional valve, and it is necessary to adjust the PID parameters for each batch of different valves. The adjustment method is cumbersome, which is not conducive to large-scale production and maintenance; traditional flow PID The control cannot make the large flow proportional valve quickly and accurately control the flow below 10LPM, and the overshoot phenomenon caused by the inconsistency of the proportional valve cannot be solved in the control, and the flow from 0LPM to the required small flow time is fed back by the control algorithm The period is seriously affected, and different feedback times have different delays for small flow establishment

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