CN105031788A - Breathing machine voltage regulating system and control method - Google Patents
Breathing machine voltage regulating system and control method Download PDFInfo
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- CN105031788A CN105031788A CN201510442365.4A CN201510442365A CN105031788A CN 105031788 A CN105031788 A CN 105031788A CN 201510442365 A CN201510442365 A CN 201510442365A CN 105031788 A CN105031788 A CN 105031788A
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Abstract
The invention discloses a breathing machine voltage regulating system and a control method. The method comprises the following steps that an arithmetic system receives input voltage, a pressure sensor collects output pressure of a turbofan and feeds data back to the arithmetic system, the arithmetic system performs arithmetic treatment and then outputs motor control voltage to a control system, and the control system controls the rotation speed of the turbofan according to the motor control voltage to control the output pressure of the turbofan. According to the breathing machine voltage regulating system and the control method, the air pressure output by the turbofan is adopted as closed-loop control of feedback, similar integral windup controlled by PID cannot be generated, a motor is rapid in response, the response time of a breathing machine is significantly shortened, and the comfortableness of the breathing machine is significantly improved.
Description
Technical field
The invention belongs to medical instruments field, particularly relate to a kind of respirator voltage-regulating system and control method.
Background technology
In current clinical medicine, respirator is as the effective means of an energy artificial substituting expiratory positive airway pressure function, be commonly used in the respiratory failure caused by a variety of causes, the management of the anesthesia respiration during major operation, Breathing Suppotion treatment and emergency resuscitation, in Modern Medical Field, occupied very important position.Respirator is that one can play prevention and therapy respiratory failure, reduces complication, saves and extend the vital armarium of patients ' lives.
Respirator is a kind of for the purpose of the air exporting certain pressure or flow velocity, assisted respiartion functional defect or because of special circumstances cannot the medical apparatus and instruments of patient respiratory of autonomous respiration.Take motor as the turbofan of power be respirator be critical piece, therefore electric machine control system is one of the most key system of whole respirator system.In the control system of respirator, it is degenerative closed loop control that the control of motor adopts with turbine output pressure or motor speed usually, and it is that the type controls the most frequently used control method that PID controls.Software PID control technology is a kind of closed loop control, usually with the rotating speed of turbofan, delivery air pressure or flow are negative feedback, but, due to the feature such as elasticity of electric machine rotation inertia and air, there is longer time delay in the output of feedback signal, easily causes the accumulation of PID integration item, thus cause motor speed to vibrate, the stability that impact exports, if reduce the sample frequency of PID, then affect the response time of electric system, and then affect the comfort level of patient.Adopt the shortcoming of PID control technology: 1, the time delay of turbofan output feedack amount, cause pid algorithm easily to produce pressure, flow velocity fluctuates, thus reduces the comfort level of respirator; 2, application software pid algorithm, takies the resource of higher system for data acquisition and calculating, and by A/D conversion to affect error rate high, poor stability, response speed is slow.
The patent No. is CN201310683803.7, a kind of two level respirator pressure control device and compress control method, and wherein a kind of two level respirator pressure control device, comprising: turbofan: for generation of compressed air; Turbofan driving governor: for driving described turbofan, described turbofan driving governor comprises servo controller, and described servo controller is the closed loop system by feedforward controller and feedback controller complex controll; Sensor: for detecting the actual pressure of patient airway in real time; Gas circuit: formed by hose connection, described turbofan to be connected with nasal mask by flexible pipe and to form gas circuit, connected by electric wire between described sensor and described turbofan driving governor and between described turbofan driving governor and turbofan, described sensor also with described soft pipe connection.Described in the technical scheme of this patent, turbofan driving governor adopts pid algorithm to realize the first output pressure of turbofan and the real-time adjustment of final output pressure.Therefore this patent still have employed pid algorithm to realize the adjustment of respirator pressure, does not still break away from the defect of the above-mentioned pid algorithm pointed out.
Summary of the invention
Object of the present invention is just to overcome the deficiencies in the prior art, a kind of respirator voltage-regulating system is provided, the present invention adopts the output pressure of turbofan to be the closed loop control of feeding back, do not produce the integration accumulation that similar PID controls, motor response rapidly, drastically increases response time and the comfortableness of respirator.
To achieve these goals, the invention provides a kind of respirator voltage-regulating system, comprise electric power system, arithmetic system, control system, pressure transducer and turbofan; Described electric power system is electrically connected mutually with described arithmetic system, control system, pressure transducer and turbofan respectively; Described arithmetic system, control system are connected successively with turbofan; Described pressure transducer is arranged on the air outlet place of described turbofan, and described pressure transducer is connected with described arithmetic system;
Described arithmetic system input receives an input voltage V, the corresponding input pressure P of described input voltage V; Described pressure transducer gathers the output pressure P of described turbofan
0after, output voltage V
1and feed back to described arithmetic system; Described arithmetic system receives the output voltage V of described pressure transducer
1, by output motor control voltage Vout after described arithmetic system calculation process; Described control system input receives described Electric Machine Control voltage Vout, after described control system check processing, described control system outfan output motor speed controling signal is to described turbofan, the rotating speed of described turbofan is controlled, to regulate the output pressure P of described turbofan by described motor speed control signal
0.
Further, described arithmetic system comprises receiving element, reduction unit and arithmetic element, and described receiving element receives the output voltage V of described pressure transducer
1, described receiving element is to output voltage V
1carry out processing rear output voltage V
1＇ is to described reduction unit; Described reduction unit is by output voltage V
1＇ is with the output pressure P of described turbofan
0rate of change be reduced into and the output pressure P of Electric Machine Control voltage Vout with described turbofan
0the consistent signal of rate of change, obtain output voltage V after described reduction unit reduction
4, and by output voltage V
4be delivered to described arithmetic element; Described arithmetic element receives input voltage V, and after carrying out processing and amplifying to input voltage V, obtains output voltage V
5, described arithmetic element is to output voltage V
5with output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, output motor control voltage Vout.
Further, described reduction unit comprises reduction unit one, reduction unit two and reduction unit three, and described reduction unit one revises output voltage V
1＇, and output voltage V
2to described reduction unit two, described reduction unit two couples of output voltage V
2make output voltage V after convergent-divergent process
3to described reduction unit three, described reduction unit three is by described output voltage V
3with the output pressure P of described turbofan
0rate of change be reduced into and the output pressure P of described Electric Machine Control voltage Vout with described turbofan
0the consistent signal of rate of change, output voltage V after reduction
4.
Further, described arithmetic element comprises arithmetic element one and arithmetic element two, and described arithmetic element a pair input voltage V carries out output voltage V after processing and amplifying
5, described arithmetic element two couples of output voltage V
5with output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, export described Electric Machine Control voltage Vout.
The control method of respirator voltage-regulating system of the present invention, comprises the steps:
(1) arithmetic system input receives an input voltage V, the corresponding input pressure P of described input voltage V;
(2) pressure transducer gathers the output pressure P of turbofan
0, and the corresponding output voltage V of described pressure transducer
1and feed back to described arithmetic system;
(3) receiving element of arithmetic system receives the output voltage V of described pressure transducer
1, described receiving element is to described output voltage V
1carry out processing rear output voltage V
1＇ is to the reduction unit of described arithmetic system;
(4) described reduction unit is by output voltage V
1＇ is with the output pressure P of described turbofan
0rate of change be reduced into and the output pressure P of Electric Machine Control voltage Vout with described turbofan
0the consistent signal of rate of change, after described reduction unit reduction, obtain output voltage V
4, and by described output voltage V
4be delivered to the arithmetic element of described arithmetic system;
(5) described arithmetic element receives described input voltage V, and after described arithmetic element enters processing and amplifying to described input voltage V, obtains output voltage V
5, described arithmetic element is again to described output voltage V
5with described output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, output motor control voltage Vout;
(6) described control system input receives described Electric Machine Control voltage Vout, and after described control system check processing, described control system outfan output motor speed controling signal is to described turbofan;
(7) described turbofan is according to described motor speed control signal, controls the rotating speed of described turbofan, to control the output pressure P of described turbofan
0.
6, the control method of respirator voltage-regulating system according to claim 5, is characterized in that, as the output pressure P of described turbofan
0when being not equal to input pressure P, the output voltage V that described arithmetic system feeds back according to described pressure transducer
1, the magnitude of voltage of the Electric Machine Control voltage Vout of regulation output, regulates the motor speed control signal that described control system exports, to change the rotating speed of described turbofan thus to change the output pressure P of described turbofan
0, until output pressure P
0equal input pressure P;
As the output pressure P of described turbofan
0when equaling input pressure P, the magnitude of voltage of the Electric Machine Control voltage Vout that described arithmetic system exports is fixed value, and the rotating speed of described turbofan is constant.
Further, in step (3), described receiving element is to output voltage V
1the concrete operations carrying out processing are:
The output voltage V of pressure transducer
1with output pressure P
0between form curve be pressure transducer curve of output, suppose that its expression formula is: V
1=V
1(P
0), and 0≤P
0≤ P
max, Vs
-min≤V
1≤ Vs
-max, wherein slope is K
1; Described receiving element is mainly to pressure transducer curve of output V
1=V
1(P
0) carry out filtering and amplitude limiting processing, filtering pressure transducer curve of output V
1=V
1(P
0) in interference components, described receiving element output voltage V after filtering interfering component
1＇.
Further, in step (4), the output voltage V obtained after described reduction unit reduction
4with the output pressure P of described turbofan
0rate of change and Electric Machine Control voltage Vout with the output pressure P of described turbofan
0rate of change consistent.
Further, in step (4), described reduction unit comprises reduction unit one, reduction unit two and reduction unit three, and described reduction unit is by output voltage V
1＇ is with the output pressure P of described turbofan
0rate of change be reduced into and the output pressure P of Electric Machine Control voltage Vout with described turbofan
0the consistent signal of rate of change, reduction step is specially:
The output voltage V that reduction unit receives
1＇ and output pressure P
0between form curve be output voltage V
1＇ controlling curve, supposes that its expression formula is: V
1＇=V
1＇ (P
0), and 0≤P
0≤ P
max, Vs
-min≤V
1＇≤Vs
-max, wherein slope is K
1; The Electric Machine Control voltage Vout that arithmetic element exports and output pressure P
0between form curve be Electric Machine Control curve, suppose that its expression formula is Vout=Vout (P
0), and 0≤P
0≤ P
max, Vm
-min≤Vout≤Vm
-max, wherein slope is Kout;
(1) reduction unit one: revise output voltage V
1＇ controlling curve, correction amount E is output pressure output voltage corresponding when being zero, obtains output voltage V
2controlling curve, then V
2=V
1＇ (P
0)-Δ E, makes V
2=V
2(P
0), and 0≤P
0≤ P
max, 0≤V
2≤ Vs
-max-Vs
-min, wherein slope is K
1, Δ E=Vs
-min;
(2) reduction unit two: to output voltage V
2controlling curve, does convergent-divergent process further, obtains output voltage V
3controlling curve, wherein zoom factor is Vd
-max/ (Vs
-max-Vs
-min), then V
3=V
2* Vd
-max/ (Vs
-max-Vs
-min), V is made
3=V
3(P
0), and 0≤P
0≤ P
max, 0≤V
3≤ Vd
-max, wherein slope is K
1* Vd
-max/ (Vs
-max-Vs
-min), described reduction unit two obtains output voltage V
3after, by being delivered to described reduction unit three after A/D module converter again, wherein Vd_max is the reference voltage of A/D module;
(3) reduction unit three: by output voltage V
3the rate of change of controlling curve is reduced into consistent with the rate of change of Electric Machine Control curve, obtains output voltage V
4controlling curve, then V
4=V
3* Kout/K
3, make V
4=V
4(P
0), and 0≤P
0≤ P
max, 0≤V
4≤ Vm
-max, wherein slope is K
4, output voltage V
4controlling curve, after rate of change reduction, obtains K
4=Kout, therefore in the process of rate of change reduction, the coefficient of restoring transformation is
Further, in step (5), described arithmetic element comprises arithmetic element one and arithmetic element two, and described arithmetic element carries out processing and amplifying to described input voltage V, obtains output voltage V
5, then to described output voltage V
5with output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, export described Electric Machine Control voltage Vout, concrete operations are:
The curve formed between described input voltage V and described input pressure P is input voltage V controlling curve, supposes that its expression formula is: V=V (P), and 0≤P≤P
max, 0≤V≤Va
-max, wherein slope is K; The Electric Machine Control voltage Vout that described arithmetic element exports and described output pressure P
0between form curve be Electric Machine Control curve, suppose that its expression formula is Vout=Vout (P
0), and 0≤P
0≤ P
max, Vm
-min≤Vout≤Vm
-max, wherein slope is Kout;
(1) arithmetic element one: processing and amplifying is carried out to input voltage V controlling curve, wherein times multiplying factor is Q (K), and
obtain output voltage V
5controlling curve, then V
5=V (P) * Q (K), and 0≤P≤P
max, 0≤V
5≤ Va
-max*Q (K);
(2) arithmetic element two: do signed magnitude arithmetic(al) process:
Vout＝V
5(P)-V
4(P
0)+Vm
-min。
Compared with prior art, beneficial effect of the present invention:
1, the present invention adopts the output pressure of turbofan to be the closed loop control of feeding back, and do not produce the integration accumulation that similar PID controls, motor response rapidly, drastically increases response time and the comfortableness of respirator.
2, the present invention is configured accessory circuit with " controlled pressure=2* Shu enters the actual output pressure of Ya Li – ", achieve the control of motor, and hardware circuit calculates without time delays, stablizes again fast, arithmetic system is very fast in computing simultaneously, and operational error is minimum.
3, when respirator reduces because of the excessive build-up of pressure of air leakage, hardware circuit of the present invention can compensate operation automatically; If when the air leakage of respirator exceeds the compensation range of this circuit, then can perform operation input pressure being compensated to adjustment, to ensure under any circumstance, the pressure of turbofan stable output.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structured flowchart of present system;
Fig. 2 is the structured flowchart of arithmetic system of the present invention.
Above-mentioned Reference numeral:
1 electric power system, 2 arithmetic systems, 3 control system, 4 turbofans, 5 pressure transducers
21 receiving elements, 22 reduction units, 221 reduction unit one, 222 reduction unit two, 223 reduction unit three, 23 arithmetic elements, 231 arithmetic element one, 232 arithmetic elements.
Detailed description of the invention
Below in conjunction with accompanying drawing, invention is further illustrated, but be not used for limiting the scope of the invention.
Embodiment
As shown in Figure 1, 2, a kind of respirator voltage-regulating system provided by the invention, comprises electric power system 1, arithmetic system 2, control system 3, pressure transducer 5 and turbofan 4; Described electric power system 1 is electrically connected mutually with described arithmetic system 2, control system 3, pressure transducer 5 and turbofan 4 respectively; Described arithmetic system 2, control system 3 are connected successively with turbofan 4; Described pressure transducer 5 is arranged on the air outlet place of described turbofan 4, and described pressure transducer 5 is connected with described arithmetic system 2;
Described arithmetic system 2 input receives an input voltage V, the corresponding input pressure P of described input voltage V; Described pressure transducer 5 gathers the output pressure P of described turbofan 4
0after, output voltage V
1and feed back to described arithmetic system 2; Described arithmetic system 2 receives the output voltage V of described pressure transducer 5
1, by output motor control voltage Vout after described arithmetic system 2 calculation process; Described control system 3 input receives described Electric Machine Control voltage Vout, after described control system 3 check processing, described control system 3 outfan output motor speed controling signal is to described turbofan 4, the rotating speed of described turbofan 4 is controlled, to regulate the output pressure P of described turbofan 4 by described motor speed control signal
0.
The present invention is further, and described arithmetic system 2 comprises receiving element 21, reduction unit 22 and arithmetic element 23, and described receiving element 21 receives the output voltage V of described pressure transducer 5
1, described receiving element 21 couples of output voltage V
1carry out processing rear output voltage V
1＇ is to described reduction unit 22; Described reduction unit 22 is by output voltage V
1＇ is with the output pressure P of described turbofan 4
0rate of change be reduced into and the output pressure P of Electric Machine Control voltage Vout with described turbofan 4
0the consistent signal of rate of change, described reduction unit 22 obtains output voltage V after reducing
4, and by output voltage V
4be delivered to described arithmetic element 23; Described arithmetic element 23 receives input voltage V, and after carrying out processing and amplifying to input voltage V, obtains output voltage V5, described arithmetic element 23 couples of output voltage V
5with output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, output motor control voltage Vout.
Further, described reduction unit 22 comprises reduction unit 1, reduction unit 2 222 and reduction unit 3 223, and described reduction unit 1 revises output voltage V
1＇, and output voltage V
2to described reduction unit 2 222, described reduction unit 2 222 couples of output voltage V
2make output voltage V after convergent-divergent process
3to described reduction unit 3 223, described reduction unit 3 223 is by described output voltage V
3with the output pressure P of described turbofan 4
0rate of change be reduced into and the output pressure P of described Electric Machine Control voltage Vout with described turbofan 4
0the consistent signal of rate of change, output voltage V after reduction
4.
Further, described arithmetic element 23 comprises arithmetic element 1 and arithmetic element 2 232, and described arithmetic element one 231 couples of input voltage V carry out output voltage V after processing and amplifying
5, described arithmetic element 2 232 couples of output voltage V
5with output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, export described Electric Machine Control voltage Vout.
Control system 3 comprises electric machine controller, after electric machine controller receives the Electric Machine Control voltage Vout of arithmetic system 2 output, detects motor operating state, and after detection is normal, output motor speed controling signal is to turbofan 4, the rotating speed of control turbofan 4.Control system 3 also comprises drive circuit and peripheral accessory device, electric machine controller is the core component controlling motor rotation, its operation principle is for receiving Electric Machine Control voltage Vout, detect motor operating state, output motor speed controling signal, common electric machine controller can be realized by dedicated machine controller, such as: ML4425, MC33035, also can by the single-chip microcomputer time, drive circuit comprises driving chip, the rectifier bridge of composition and accessory circuit, peripheral accessory circuit comprises the power circuit of control system 3, current detection circuit, protection circuit, rotating speed counting circuit etc.
The control method of respirator voltage-regulating system of the present invention, comprises the steps:
(1) arithmetic system 2 input receives an input voltage V, the corresponding input pressure P of described input voltage V;
(2) pressure transducer 5 gathers the output pressure P of turbofan 4
0, and the corresponding output voltage V of described pressure transducer 5
1and feed back to described arithmetic system 2;
(3) receiving element 21 of arithmetic system 2 receives the output voltage V of described pressure transducer 5
1, described receiving element 21 is to described output voltage V
1carry out processing rear output voltage V
1＇ is to the reduction unit 22 of described arithmetic system 2;
(4) described reduction unit 22 is by output voltage V
1＇ is with the output pressure P of described turbofan 4
0rate of change be reduced into and the output pressure P of Electric Machine Control voltage Vout with described turbofan 4
0the consistent signal of rate of change, after described reduction unit 22 reduces, obtain output voltage V
4, and by described output voltage V
4be delivered to the arithmetic element 23 of described arithmetic system 2;
(5) described arithmetic element 23 receives described input voltage V, and after described arithmetic element 23 enters processing and amplifying to described input voltage V, obtains output voltage V
5, described arithmetic element 23 is again to described output voltage V
5with described output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, output motor control voltage Vout;
(6) described control system 3 input receives described Electric Machine Control voltage Vout, and after described control system 3 check processing, described control system 3 outfan output motor speed controling signal is to described turbofan 4;
(7) described turbofan 4 is according to described motor speed control signal, controls the rotating speed of described turbofan 4, to control the output pressure P of described turbofan 4
0.
Principles of Regulation of the present invention: as the output pressure P of described turbofan 4
0when being not equal to input pressure P, the output voltage V that described arithmetic system 2 feeds back according to described pressure transducer 5
1, the magnitude of voltage of the Electric Machine Control voltage Vout of regulation output, regulates the motor speed control signal that described control system 3 exports, to change the rotating speed of described turbofan 4 thus to change the output pressure P of described turbofan 4
0, until output pressure P
0equal input pressure P.
As the output pressure P of described turbofan 4
0when equaling input pressure P, the magnitude of voltage of the Electric Machine Control voltage Vout that described arithmetic system 2 exports is fixed value, and the rotating speed of described turbofan 4 is constant.
When system start-up of the present invention, the output pressure P of turbofan 4
0increase to close to input pressure P from 0, now the output pressure P of turbofan 4
0be not equal to input pressure P, gathered the output pressure P of turbofan 4 by pressure transducer 5
0, and fed-back output voltage V
1to arithmetic system 2, the output voltage V that arithmetic system 2 feeds back according to pressure transducer 5
1, the magnitude of voltage of the Electric Machine Control voltage Vout of regulation output, carrys out the motor speed control signal that regulation and control system 3 exports, with the output pressure P of the rotating speed thus change turbofan 4 that change turbofan 4
0, until output pressure P
0equal input pressure P.
In step (3), receiving element 21 couples of output voltage V
1the concrete operations carrying out processing are:
The output voltage V of pressure transducer 5
1with output pressure P
0between form curve be pressure transducer curve of output, suppose that its expression formula is: V
1=V
1(P
0), and 0≤P
0≤ P
max, Vs
-min≤V
1≤ Vs
-max, wherein slope is K
1; Described receiving element 21 is main to pressure transducer curve of output V
1=V
1(P
0) carry out filtering and amplitude limiting processing, filtering pressure transducer curve of output V
1=V
1(P
0) in interference components, described receiving element output voltage V after filtering interfering component
1＇.
In step (4), reduction unit 22 comprises reduction unit 1, reduction unit 2 222 and reduction unit 3 223, and reduction unit 22 is by output voltage V
1＇ is with the output pressure P of described turbofan 4
0rate of change be reduced into and the output pressure P of Electric Machine Control voltage Vout with described turbofan 4
0the consistent signal of rate of change, reduction step is specially:
The output voltage V that reduction unit 22 receives
1＇ and output pressure P
0between form curve be output voltage V
1＇ controlling curve, supposes that its expression formula is: V
1＇=V
1＇ (P
0), and 0≤P
0≤ P
max, Vs
-min≤V
1＇≤Vs
-max, wherein slope is K
1; The Electric Machine Control voltage Vout that arithmetic element 23 exports and output pressure P
0between form curve be Electric Machine Control curve, suppose that its expression formula is Vout=Vout (P
0), and 0≤P
0≤ P
max, Vm
-min≤Vout≤Vm
-max, wherein slope is Kout;
(1) reduction unit 1: revise output voltage V
1＇ controlling curve, correction amount E is output pressure output voltage corresponding when being zero, obtains output voltage V
2controlling curve, then V
2=V
1＇ (P
0)-Δ E, makes V
2=V
2(P
0), and 0≤P
0≤ P
max, 0≤V
2≤ Vs
-max-Vs
-min, wherein slope is K
1, Δ E=Vs
-min;
(2) reduction unit 2 222: to output voltage V
2controlling curve, does convergent-divergent process further, obtains output voltage V
3controlling curve, wherein zoom factor is Vd
-max/ (Vs
-max-Vs
-min), then V
3=V
2* Vd
-max/ (Vs
-max-Vs
-min), V is made
3=V
3(P
0), and 0≤P
0≤ P
max, 0≤V
3≤ Vd
-max, wherein slope is K
1* Vd
-max/ (Vs
-max-Vs
-min), described reduction unit 2 222 obtains output voltage V
3after, by being delivered to described reduction unit 3 223 after A/D module converter again, wherein Vd_max is the reference voltage of A/D module;
(3) reduction unit 3 223: by output voltage V
3the rate of change of controlling curve is reduced into consistent with the rate of change of Electric Machine Control curve, obtains output voltage V
4controlling curve, then V
4=V
3* Kout/K
3, make V
4=V
4(P
0), and 0≤P
0≤ P
max, 0≤V
4≤ Vm
-max, wherein slope is K
4, output voltage V
4controlling curve, after rate of change reduction, obtains K
4=Kout, therefore in the process of rate of change reduction, the coefficient of restoring transformation is
In step (5), described arithmetic element 23 comprises arithmetic element 1 and arithmetic element 2 232, and described arithmetic element carries out processing and amplifying to described input voltage V, obtains output voltage V
5, then to described output voltage V
5with output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, export described Electric Machine Control voltage Vout, concrete operations are:
The curve formed between described input voltage V and described input pressure P is input voltage V controlling curve, supposes that its expression formula is: V=V (P), and 0≤P≤P
max, 0≤V≤Va
-max, wherein slope is K; The Electric Machine Control voltage Vout that described arithmetic element exports and described output pressure P
0between form curve be Electric Machine Control curve, suppose that its expression formula is Vout=Vout (P
0), and 0≤P
0≤ P
max, Vm
-min≤Vout≤Vm
-max, wherein slope is Kout;
(1) arithmetic element 1: processing and amplifying is carried out to input voltage V controlling curve, wherein times multiplying factor is Q (K), and
obtain output voltage V
5controlling curve, then V
5=V (P) * Q (K), and 0≤P≤P
max, 0≤V
5≤ Va
-max*Q (K);
(2) arithmetic element 2 232: do signed magnitude arithmetic(al) process:
Vout＝V
5(P)-V
4(P
0)+Vm
-min。
In step (1), the input voltage V that arithmetic system 2 receives is the output voltage of the peripheral components outside respirator voltage-regulating system of the present invention, and the output voltage of peripheral components is from the output voltage comprising D/A module corresponding pin, wherein Va
-max is the reference voltage of D/A module.The output voltage of peripheral components also can from the output voltage of other hardware cells.
Pressure transducer 5 of the present invention preferably, adopts linearly good element, therefore the output voltage V of pressure transducer 5 that obtains of the present invention
1with the output pressure P of turbofan 4
0the pressure transducer curve of output V formed
1=V
1(P
0), it is a curve, i.e. the output voltage V of pressure transducer 5
1with the output pressure P of turbofan 4
0between linear change.The output voltage V obtained after receiving element 21 processes
1＇ controlling curve, and reduce through reduction unit 22 the output voltage V obtained
2controlling curve, output voltage V
3controlling curve, output voltage V
4controlling curve, the Electric Machine Control voltage Vout obtained after arithmetic element 23 calculation process and the output pressure P of turbofan 4
0between form Electric Machine Control curve Vout=Vout (P
0), be more than a curve.The input voltage V controlling curve formed between the input voltage V that same arithmetic system 2 receives and input pressure P, it is also a curve.Owing to being a curve with upper curve, therefore with variation relation linear between the voltage in upper curve and pressure.
For the linear changing relation clearly illustrating that between arithmetic system 2 of the present invention, control system 3, pressure transducer 5, voltage occurs, illustrate in conjunction with related data: when the magnitude of voltage of the Electric Machine Control voltage Vout of input control system 3 is linearly increased to 2V by 1V, the output pressure P of corresponding turbofan 4
0if linearly boost to 20cmH2O from 10cmH2O, so, the output voltage V of pressure transducer 5 feedback
1the linear voltage that also should export 1V is accordingly poor, such as: suppose that pressure transducer 5 feeds back 1.2V at 10cmH2O, so should feed back 2.2V voltage when 20cmH2O.
Sum up above-mentioned gained, the configuration purpose of control method of the present invention is: controlled pressure=2* Shu enters the actual output pressure of Ya Li –, supposes: the input pressure P that arithmetic system 2 receives is when being 5cmH2O, if the output pressure P of now turbofan 4
0, namely actual output pressure is 3cmH2O, the Electric Machine Control voltage Vout of so arithmetic system 2 output, corresponding controlled pressure, because 7cmH2O, i.e. 2*5-3=7, now by increasing the controlled pressure that arithmetic system 2 exports, makes the output pressure P of turbofan 4
0acceleration boosts to 5cmH2O, now the output pressure P of input pressure P and turbofan 4
0force value equal, corresponding controlled pressure 5cmH2O now, i.e. 2*5-5=5.Utilize " controlled pressure=2* Shu enters the actual output pressure of Ya Li – " this set formula, the control of turbofan 4 of the present invention can be realized, and when hardware circuit calculates in respirator voltage-regulating system of the present invention, without time delays, quick and stablize.
That introduces arithmetic system 2 of the present invention below in detail pushes over principle: push over the English symbol used in principle below, just for convenience of explanation arithmetic system 2 of the present invention push over principle, be only applicable to this part, be not suitable for other parts in description:
The mathematical principle of the receiving element 21 one, in arithmetic system 2, reduction unit 22, arithmetic element 23 is:
1, input voltage V controlling curve: V=V (P), wherein P is input pressure, and V is input voltage.
2, receiving element 21 receives pressure transducer 5 and feeds back: V
1=V
1(P), wherein P is force value, V
1for the output voltage of pressure transducer 5;
3, reduction unit 22 restoring transformation: by V
1=V
1(P) V=F (K) * (V, is transformed to
1(P)-△ E), wherein F (K) is restoring transformation coefficient, and △ E is correction, is the optimized amount of pressure transducer 5 output voltage;
4, arithmetic element 23 mathematical operation formula: Vout (P)=Q (K) * V (P) – F (K) * V
1(P), wherein Q (k) is a times multiplying factor.
Two, the principle of pushing over of the restoring transformation coefficient F (K) of reduction unit 22 is:
The linear coefficient of input voltage V controlling curve and intercept are (K, B), and the linear coefficient of pressure transducer curve of output and intercept are (K
1, B
1), application reduction unit 2.2 in doubly take advantage of circuit counting, its medium multiple is ξ, pressure transducer curve of output is reduced to consistent linear coefficient with input voltage V controlling curve, i.e. K=ξ K
1, in like manner, intercept is ξ B
1, now, ξ B
1usually B is not equal to; Plus and minus calculation in primary circuit is gone back in application, and (adding decrement is △ B
1) reduction intercept coefficient, make the intercept of pressure transducer curve of output be B=0, now, make the rate of change of pressure transducer curve of output identical with the rate of change of Electric Machine Control curve.
1, reduction unit 22 specifically to push over step as follows:
In respirator pressure limit, the output voltage range of pressure transducer 5 is (Vs_min ~ Vs_max) (1)
For the ease of date processing, (1) formula does subtraction process, that is: (1)-Vs_min=(0 ~ Vs_max-Vs_min) (2)
Suppose that the resolution of the A/D module of MCU (micro-control unit) is n position, (note: the resolution of A/D module: it shows the resolution capability of A/D to analogue signal, determine that the minimum modulus analog quantity that can be distinguished by A/D changes by it, in general, the figure place of A/D module is more, and its resolution is then higher.) the maximum 2^n=Dmax of corresponding resolution, the output voltage that wherein maximum Dmax is corresponding is Vmax;
By pressure transducer curve of output V
1=V
1(P) (3)
According to formula (1) (2) mode process, to obtain final product: V
1'=(V
1(P)-Vs_min) * (Vmax/Vs_min) (4)
(4) formula of arrangement: V
1'=Vmax/Vs_min*V
1(P)-Vmax;
By V
1=V
1(P) linear coefficient and intercept are K
1, B
1, then V
1'=V
1' linear coefficient of (P) and intercept be K
1* Vmax/Vs_min, (B
1-Vs_min) * (Vmax/Vs_min).
By V
1' use V
2represent, K
2=K
1* Vmax/Vs_min, B
2=(B
1-Vs_min) * (Vmax/Vs_min) (5)
Therefore, the pressure transducer curve of output after optimization is V
2=V
2(P), slope is K
2, intercept is B
2(6).
Wherein, the hardware of (6) formula exports can by the A/D module acquires of MCU, the output pressure value of respirator.
Be V=V (P) by input voltage V controlling curve, slope is K, and intercept is B.(7)
Be (7) by (6) formula slope application hardware circuit transformations, that is: make new variables A=K/K
2.
Make V
2=V
2(P) curve of output is multiplied by A, i.e. V
2* A obtains V
2=V
2(P) * A (8), its slope is K
2* A, intercept is B
2* A.
Now B
2* A ≠ B, application hardware adder and substracter circuit, i.e. (8)-B
2* A (9).
Make (9) formula V
2=V
2(P) * A+0, i.e. V
3=V
3(P), its slope is K
3, intercept is 0 (10)
Now K
3=K, intercept is 0, and after restoring transformation, the output voltage range of pressure transducer 5 is (0 ~ Vc_max).
Pressure transducer curve of output after conversion has identical rate of change with Electric Machine Control curve.
Respirator project for this patent:
V (P)=0.0556*P+2.024 (Electric Machine Control curve)
V
1=V
1(P)=0.0953*P+1.16 (pressure transducer curve of output)
Apply above-mentioned reduction step and obtain A=0.0556/0.0953=0.58,
B
2*A＝(B
1-Vs_min)*(Vmax/Vs_min)＝(1.16–1.16)*(Vmax/Vs_min)＝0；
Three, the principle of arithmetic element 23 is:
Arithmetic element 23 by the output voltage of reduction unit 22 and input voltage, according to Vout (P)=Q (K) * V (P) – F (K) * V
1(P) relational expression builds two-stage hardware computation circuit, application percentage circuit and subtraction circuit realize, in order to the structure of optimized circuit, usually the subtraction circuit in reduction unit 22 is calculated in the circuit, namely, in the subtraction circuit of the second level, the △ B value after the conversion of pressure transducer curve of output is added.
1, arithmetic element 23 specifically to push over principle as follows:
By (7) formula, suppose that the control inputs voltage range of motor is for (Vm_min ~ Vm_max) (11).
For the D/A module optimizing MCU exports, application subtractor deducts Vm_min in the front end of the electric machine controller of control system 2, and the control inputs voltage range both having obtained turbofan 4 is (0 ~ Vm_max-Vm_min) (12).
From (5) formula, the output voltage range of the pressure transducer 5 after reduction unit 22 reduces equals the control inputs voltage range of turbofan 4, is (11) formula.
This scope is still done the conversion that (12) formula is identical, now obtain the output voltage range of pressure transducer 5, be assumed to be: (0 ~ Vc_max) (13).
Because Q (K) coefficient should not be less than 1, and this Q (K) should make the digital quantity of D/A module contain whole pressure range, different according to the D/A module precision of different MCU, supposes that D/A module is n position here, that is:
D/A digital quantity is assumed to be (0 ~ Dm_max) (14) for (0 ~ 2^n).
Here, suppose that now the maximum of pressure is: Pmax, the output of now corresponding D/A module is Dm_max,
Now, D/A module output voltage is Vd_max, in order to make motor export maximum pressure, must have:
Vd_max*Q (K)-Vc_max=Vm_max (15), obtains Q (K)=(Vm_max+Vc_max)/Vd_max;
Therefore, in arithmetic element, add subtractor, in order to meet Vout (P)=Q (K) * V (P)-F (K) * V
1(P) (16).
Example is applied as with this patent,
The D/A module of 10, digital quantity 0 ~ 1023 output voltage range should be able to control the output pressure 0 ~ 30cmH2O of turbofan 4;
And the control voltage scope of turbofan 4 is 1.5 ~ 4.2Vdc (supposing that this scope is Vc_min ~ Vc_max),
Pressure transducer curve of output by after reducing: V
3=V
3(P)=0.0956*P, output interval is 0 ~ 2.79Vdc, therefore Q (K)=(4.2+2.79)/3.3=2.118.
Four, the operating mechanism of arithmetic element 23:
If the output pressure P of turbofan 4
0when equaling to arrange input pressure value P, the Vout of output is fixed value, if due to cause flowed fluctuation when patient's tidal volume changes so that affect pressure change time, the output pressure P of turbofan 4
0be not equal to when pressure P is set, F (K) * V
1(P) inverse change, the Vout of output increases, and turbofan 4 rotating speed improves, output pressure P
0increase, vice versa.
Five, the effect of the operating mechanism of arithmetic element 2.3:
If respirator because of the excessive build-up of pressure of air leakage reduce time, then the hardware circuit in system can compensate operation automatically; If when the air leakage of respirator exceeds the compensation range of this circuit, then can perform operation input pressure P being compensated to adjustment.
The control method of respirator voltage-regulating system of the present invention adopts the output pressure of turbofan 4 to be the closed loop control of feeding back, and do not produce the integration accumulation that similar PID controls, motor response rapidly, drastically increases response time and the comfortableness of respirator.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and description just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (10)
1. a respirator voltage-regulating system, is characterized in that, comprises electric power system, arithmetic system, control system, pressure transducer and turbofan; Described electric power system is electrically connected mutually with described arithmetic system, control system, pressure transducer and turbofan respectively; Described arithmetic system, control system are connected successively with turbofan; Described pressure transducer is arranged on the air outlet place of described turbofan, and described pressure transducer is connected with described arithmetic system;
Described arithmetic system input receives an input voltage V, the corresponding input pressure P of described input voltage V; Described pressure transducer gathers the output pressure P of described turbofan
0after, output voltage V
1and feed back to described arithmetic system; Described arithmetic system receives the output voltage V of described pressure transducer
1, by output motor control voltage Vout after described arithmetic system calculation process; Described control system input receives described Electric Machine Control voltage Vout, after described control system check processing, described control system outfan output motor speed controling signal is to described turbofan, the rotating speed of described turbofan is controlled, to regulate the output pressure P of described turbofan by described motor speed control signal
0.
2. respirator voltage-regulating system according to claim 1, is characterized in that, described arithmetic system comprises receiving element, reduction unit and arithmetic element, and described receiving element receives the output voltage V of described pressure transducer
1, described receiving element is to output voltage V
1carry out processing rear output voltage V
1＇ is to described reduction unit; Described reduction unit is by output voltage V
1＇ is with the output pressure P of described turbofan
0rate of change be reduced into and the output pressure P of Electric Machine Control voltage Vout with described turbofan
0the consistent signal of rate of change, obtain output voltage V after described reduction unit reduction
4, and by output voltage V
4be delivered to described arithmetic element; Described arithmetic element receives input voltage V, and after carrying out processing and amplifying to input voltage V, obtains output voltage V5, and described arithmetic element is to output voltage V
5with output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, output motor control voltage Vout.
3. respirator voltage-regulating system according to claim 2, is characterized in that, described reduction unit comprises reduction unit one, reduction unit two and reduction unit three, and described reduction unit one revises output voltage V
1＇, and output voltage V
2to described reduction unit two, described reduction unit two couples of output voltage V
2make output voltage V after convergent-divergent process
3to described reduction unit three, described reduction unit three is by described output voltage V
3with the output pressure P of described turbofan
0rate of change be reduced into and the output pressure P of described Electric Machine Control voltage Vout with described turbofan
0the consistent signal of rate of change, output voltage V after reduction
4.
4. respirator voltage-regulating system according to claim 2, is characterized in that, described arithmetic element comprises arithmetic element one and arithmetic element two, and described arithmetic element a pair input voltage V carries out output voltage V after processing and amplifying
5, described arithmetic element two couples of output voltage V
5with output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, export described Electric Machine Control voltage Vout.
5. a control method for the respirator voltage-regulating system as described in any one of Claims 1 to 4, is characterized in that, comprise the steps:
(1) arithmetic system input receives an input voltage V, the corresponding input pressure P of described input voltage V;
(2) pressure transducer gathers the output pressure P of turbofan
0, and the corresponding output voltage V of described pressure transducer
1and feed back to described arithmetic system;
(3) receiving element of arithmetic system receives the output voltage V of described pressure transducer
1, described receiving element is to described output voltage V
1carry out processing rear output voltage V
1＇ is to the reduction unit of described arithmetic system;
(4) described reduction unit is by output voltage V
1＇ is with the output pressure P of described turbofan
0rate of change be reduced into and the output pressure P of Electric Machine Control voltage Vout with described turbofan
0the consistent signal of rate of change, after described reduction unit reduction, obtain output voltage V
4, and by described output voltage V
4be delivered to the arithmetic element of described arithmetic system;
(5) described arithmetic element receives described input voltage V, and after described arithmetic element enters processing and amplifying to described input voltage V, obtains output voltage V
5, described arithmetic element is again to described output voltage V
5with described output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, output motor control voltage Vout;
(6) described control system input receives described Electric Machine Control voltage Vout, and after described control system check processing, described control system outfan output motor speed controling signal is to described turbofan;
(7) described turbofan is according to described motor speed control signal, controls the rotating speed of described turbofan, to control the output pressure P of described turbofan
0.
6. the control method of respirator voltage-regulating system according to claim 5, is characterized in that, as the output pressure P of described turbofan
0when being not equal to input pressure P, the output voltage V that described arithmetic system feeds back according to described pressure transducer
1, the magnitude of voltage of the Electric Machine Control voltage Vout of regulation output, regulates the motor speed control signal that described control system exports, to change the rotating speed of described turbofan thus to change the output pressure P of described turbofan
0, until output pressure P
0equal input pressure P;
As the output pressure P of described turbofan
0when equaling input pressure P, the magnitude of voltage of the Electric Machine Control voltage Vout that described arithmetic system exports is fixed value, and the rotating speed of described turbofan is constant.
7. the control method of respirator voltage-regulating system according to claim 5, is characterized in that, in step (3), described receiving element is to output voltage V
1the concrete operations carrying out processing are:
The output voltage V of pressure transducer
1with output pressure P
0between form curve be pressure transducer curve of output, suppose that its expression formula is: V
1=V
1(P
0), and 0≤P
0≤ P
max, Vs_min≤V
1≤ Vs_max, wherein slope is K
1; Described receiving element is mainly to pressure transducer curve of output V
1=V
1(P
0) carry out filtering and amplitude limiting processing, filtering pressure transducer curve of output V
1=V
1(P
0) in interference components, described receiving element output voltage V after filtering interfering component
1＇.
8. the control method of respirator voltage-regulating system according to claim 5, is characterized in that, in step (4), and the output voltage V obtained after described reduction unit reduction
4with the output pressure P of described turbofan
0rate of change and Electric Machine Control voltage Vout with the output pressure P of described turbofan
0rate of change consistent.
9. the control method of respirator voltage-regulating system according to claim 5, is characterized in that, in step (4), described reduction unit comprises reduction unit one, reduction unit two and reduction unit three, and described reduction unit is by output voltage V
1＇ is with the output pressure P of described turbofan
0rate of change be reduced into and the output pressure P of Electric Machine Control voltage Vout with described turbofan
0the consistent signal of rate of change, reduction step is specially:
The output voltage V that reduction unit receives
1＇ and output pressure P
0between form curve be output voltage V
1＇ controlling curve, supposes that its expression formula is: V
1＇=V
1＇ (P
0), and 0≤P
0≤ P
max, Vs_min≤V
1＇≤Vs_max, wherein slope is K
1; The Electric Machine Control voltage Vout that arithmetic element exports and output pressure P
0between form curve be Electric Machine Control curve, suppose that its expression formula is Vout=Vout (P
0), and 0≤P
0≤ P
max, Vm_min≤Vout≤Vm_max, wherein slope is Kout;
(1) reduction unit one: revise output voltage V
1＇ controlling curve, correction amount E is output pressure output voltage corresponding when being zero, obtains output voltage V
2controlling curve, then V
2=V
1＇ (P
0)-Δ E, makes V
2=V
2(P
0), and 0≤P
0≤ P
max, 0≤V
2≤ Vs_max-Vs_min, wherein slope is K
1, Δ E=Vs_min;
(2) reduction unit two: to output voltage V
2controlling curve, does convergent-divergent process further, obtains output voltage V
3controlling curve, wherein zoom factor is Vd_max/ (Vs_max-Vs_min), then V
3=V
2* Vd_max/ (Vs_max-Vs_min), makes V
3=V
3(P
0), and 0≤P
0≤ P
max, 0≤V
3≤ Vd_max, wherein slope is K
1* Vd_max/ (Vs_max-Vs_min), described reduction unit two obtains output voltage V
3after, by being delivered to described reduction unit three after A/D module converter again, wherein Vd_max is the reference voltage of A/D module;
(3) reduction unit three: by output voltage V
3the rate of change of controlling curve is reduced into consistent with the rate of change of Electric Machine Control curve, obtains output voltage V
4controlling curve, then V
4=V
3* Kout/K
3, make V
4=V
4(P
0), and 0≤P
0≤ P
max, 0≤V
4≤ Vm_max, wherein slope is K
4, output voltage V
4controlling curve, after rate of change reduction, obtains K
4=Kout, therefore in the process of rate of change reduction, the coefficient of restoring transformation is
10. the control method of respirator voltage-regulating system according to claim 5, it is characterized in that, in step (5), described arithmetic element comprises arithmetic element one and arithmetic element two, described arithmetic element carries out processing and amplifying to described input voltage V, obtains output voltage V
5, then to described output voltage V
5with output voltage V
4and after offset voltage Vm_min does signed magnitude arithmetic(al) process, export described Electric Machine Control voltage Vout, concrete operations are:
The curve formed between described input voltage V and described input pressure P is input voltage V controlling curve, supposes that its expression formula is: V=V (P), and 0≤P≤P
max, 0≤V≤Va_max, wherein slope is K; The Electric Machine Control voltage Vout that described arithmetic element exports and described output pressure P
0between form curve be Electric Machine Control curve, suppose that its expression formula is Vout=Vout (P
0), and 0≤P
0≤ P
max, Vm_min≤Vout≤Vm_max, wherein slope is Kout;
(1) arithmetic element one: processing and amplifying is carried out to input voltage V controlling curve, wherein times multiplying factor is Q (K), and
obtain output voltage V
5controlling curve, then V
5=V (P) * Q (K), and 0≤P≤P
max, 0≤V
5≤ Va_max*Q (K);
(2) arithmetic element two: do signed magnitude arithmetic(al) process:
Vout＝V
5(P)-V
4(P
0)+Vm_min。
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| CP03 | Change of name, title or address |
Address after: 410205 Room 101, 1st floor, north of superstar entrepreneurship base, No. 8 Lujing Road, high tech Development Zone, Changsha, Hunan Patentee after: Hunan Mingkang Zhongjin Medical Technology Co.,Ltd. Address before: 410000 North first floor, superstar entrepreneurship base, No. 8 Lujing Road, Changsha City, Hunan Province Patentee before: HUNAN MICOME ZHONGJIN MEDICAL SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. |