CN109771757A - The control of ventilator output gas concentration and proportion algorithm - Google Patents
The control of ventilator output gas concentration and proportion algorithm Download PDFInfo
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- CN109771757A CN109771757A CN201711103333.7A CN201711103333A CN109771757A CN 109771757 A CN109771757 A CN 109771757A CN 201711103333 A CN201711103333 A CN 201711103333A CN 109771757 A CN109771757 A CN 109771757A
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- flow
- oxygen
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- proportioning valve
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Abstract
Air and oxygen flow-controllable proportioning valve and air and oxygen flow sensor is respectively set in the input terminal of ventilator in a kind of control of ventilator output gas concentration and proportion algorithm；Preset the total flow of empty oxygen gas mixture and oxygen content therein that ventilator output end needs to export；Calculate the air mass flow and oxygen flow that ventilator input terminal needs to input；The air and oxygen flow-controllable proportioning valve for adjusting separately ventilator input terminal, reach calculated air mass flow and oxygen flow；Then during gas supply, PID control system, feedback regulation and the opening degree for controlling flow-controllable proportioning valve is constituted using air and oxygen flow sensor and flow-controllable proportioning valve, it is made to remain air and oxygen flow by needs.
Description
Technical field
The invention belongs to the ventilator manufacturing technology fields in Medical Devices, are related to a kind of for air oxygen in ventilator
After mixing, the control method of oxygen concentration in the empty oxygen gas mixture of output.
Background technique
In ventilator control, the concentration of oxygen in the empty oxygen gas mixture sucked to patient end is needed accurately to be controlled,
Rational proportion is carried out in volume of the ventilator input terminal to air and oxygen, specific oxygen concentration need to be provided according to different patients,
To reach respiratory therapy effect.Mostly control is adjusted in the air mass flow to ventilator input terminal and oxygen flow by rule of thumb at present
System, it is difficult to reach accurate control.
Summary of the invention
The purpose of the present invention is to provide a kind of control of ventilator output gas concentration and proportion algorithms, in ventilator to disease
When people supplies, the oxygen concentration in gas supply can be accurately controlled.
Technical scheme is as follows:
A kind of control of ventilator output gas concentration and proportion algorithm, it is characterised in that:
Step 1: in the air input of ventilator, flow-controllable proportioning valve and air flow sensor are set；It is exhaling
Flow-controllable proportioning valve and oxygen flow sensor is arranged in the oxygen input terminal of suction machine；
Step 2: according to sick human needs, presetting the total stream for the empty oxygen gas mixture that ventilator output end needs to export
Amount and oxygen content therein；According to the total flow of empty oxygen gas mixture and oxygen content therein, ventilator input terminal is calculated
The air mass flow and oxygen flow for needing to input；
Step 3: adjusting separately the flow-controllable proportioning valve of ventilator air input and oxygen input terminal, reach defeated
Enter the air mass flow and oxygen flow that end needs to input；Utilize the oxygen flow sensor and flow-controllable proportioning valve of oxygen input terminal
Constitute PID control system, the oxygen flow measured by oxygen flow sensor, feedback regulation and control oxygen input terminal can
The opening degree for controlling flow proportion valve, the oxygen flow for making it keep needing；
Step 4: constituting PID control system with the air flow sensor and flow-controllable proportioning valve of air input, lead to
Cross the air mass flow that air flow sensor measures, feedback regulation and control air input flow-controllable proportioning valve folding
Degree, the air mass flow for making it keep needing.
Control method provided by the invention is simple and fast and accurate, if preset patient needs gas supply flow and
Oxygen concentration can quickly calculate the flow of the air and oxygen that need ventilator input terminal to need to control, and it is empty to adjust input terminal
Gas and oxygen flow-controllable proportioning valve reach required flow, then controllable by closed loop pid algorithm control very mature at present
Flow needed for flow proportion valve is kept, control precision is higher, carries out empty oxygen burden control, the precision of oxygen concentration by this method
It can reach 1%.
Specific embodiment
Before ventilator gas supply, first in the air input of ventilator, flow-controllable proportioning valve and air stream are set
Quantity sensor；In the oxygen input terminal of ventilator, flow-controllable proportioning valve and oxygen flow sensor are set.
According to the specific needs of different patients, the empty oxygen gas mixture that ventilator output end needs to export to patient is preset
Total flow d and oxygen content c therein.According to the value of c and d, the air that ventilator input terminal needs to input can be calculated
Flow a and oxygen flow b.Calculation method is as follows:
Air mass flow a=[(100-c) * d]/79；
Oxygen flow b=[(c-21) * d]/79；
Above-mentioned calculation method is that the applicant is obtained by experiment repeatedly.Experimentation is as follows:
In the input terminal of ventilator, the flow of air and oxygen is controlled respectively with two flow-controllable proportioning valves,
And the flow of air and oxygen is measured respectively with two flow sensors；In the empty oxygen mixing output end of ventilator, if
Oxygen concentration sensor is set, to measure the mixed oxygen concentration of empty oxygen.Then two flow-controllable proportioning valves are adjusted, air stream is made
Amount and oxygen flow are the arbitrary value in allowed band, and are recorded corresponding to each group of air flow value and oxygen stream magnitude
The measured value of oxygen concentration sensor.
It is analyzed by many experiments, and to experimental result, applicants have discovered that following formula:
If air mass flow is a, the flow of oxygen is b, then the oxygen concentration in mixed sky oxygen gas mixture is (a*
1+b*0.21)/(a+b)。
It pushes away according to above-mentioned formula is counter it follows that if the oxygen concentration of output is c, the stream of the empty oxygen gas mixture of output
Amount is d, then the flow of ventilator input terminal oxygen should be [(c-21) * d]/79, the flow of air should be [(100-c) * d]/
79。
It is above the present invention after output end total gas couette and oxygen concentration determine, input terminal air mass flow and oxygen
The calculation basis of flow.
After input terminal air mass flow and oxygen flow being determined by calculating, adjust separately ventilator air input and oxygen
The flow-controllable proportioning valve of gas input terminal reaches air mass flow a and oxygen flow b determined by step.
After gas supply starts, flow-controllable proportioning valve can generate little deviation because of many factors during gas supply.This hair
It is bright again by having been known at present and very mature closed loop pid algorithm, utilize the oxygen flow sensor of oxygen input terminal and controllable
Flow proportion valve constitutes PID control system, the oxygen flow measured by oxygen flow sensor, and feedback regulation simultaneously controls oxygen
The opening degree of the flow-controllable proportioning valve of input terminal makes it remain the oxygen flow b by needs；Utilize air input
Air flow sensor and flow-controllable proportioning valve constitute PID control system, the air measured by air flow sensor
Flow, feedback regulation and control air input flow-controllable proportioning valve opening degree, remain it by needs
Air mass flow a.
Claims (1)
1. a kind of ventilator output gas concentration control and proportion algorithm, it is characterised in that:
Step 1: in the air input of ventilator, flow-controllable proportioning valve and air flow sensor are set；In ventilator
Oxygen input terminal, flow-controllable proportioning valve and oxygen flow sensor are set；
Step 2: according to sick human needs, the total flow for the empty oxygen gas mixture that ventilator output end needs to export is preset, and
Oxygen content therein；According to the total flow of empty oxygen gas mixture and oxygen content therein, ventilator input terminal needs are calculated
The air mass flow and oxygen flow of input；
Step 3: adjusting separately the flow-controllable proportioning valve of ventilator air input and oxygen input terminal, reach input terminal
The air mass flow and oxygen flow for needing to input；It is constituted using the oxygen flow sensor and flow-controllable proportioning valve of oxygen input terminal
PID control system, the oxygen flow measured by oxygen flow sensor, feedback regulation and the controllable flow for controlling oxygen input terminal
The opening degree for measuring proportioning valve, the oxygen flow for making it keep needing；
Step 4: constituting PID control system with the air flow sensor and flow-controllable proportioning valve of air input, pass through sky
The air mass flow that mass-air-flow sensor measures, feedback regulation and control air input flow-controllable proportioning valve opening degree,
The air mass flow for making it keep needing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711103333.7A CN109771757A (en) | 2017-11-10 | 2017-11-10 | The control of ventilator output gas concentration and proportion algorithm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711103333.7A CN109771757A (en) | 2017-11-10 | 2017-11-10 | The control of ventilator output gas concentration and proportion algorithm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109771757A true CN109771757A (en) | 2019-05-21 |
Family
ID=66484381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711103333.7A Pending CN109771757A (en) | 2017-11-10 | 2017-11-10 | The control of ventilator output gas concentration and proportion algorithm |
Country Status (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114904115A (en) * | 2022-06-01 | 2022-08-16 | 广州和普乐健康科技有限公司 | Automatic control method and device for oxygen concentration of respiratory support device |
-
2017
- 2017-11-10 CN CN201711103333.7A patent/CN109771757A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114904115A (en) * | 2022-06-01 | 2022-08-16 | 广州和普乐健康科技有限公司 | Automatic control method and device for oxygen concentration of respiratory support device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190521 |
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| WD01 | Invention patent application deemed withdrawn after publication |