CN1553066A - Universal intelligent buffer gas pressure reducing valves - Google Patents
Universal intelligent buffer gas pressure reducing valves Download PDFInfo
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- CN1553066A CN1553066A CNA2003101116007A CN200310111600A CN1553066A CN 1553066 A CN1553066 A CN 1553066A CN A2003101116007 A CNA2003101116007 A CN A2003101116007A CN 200310111600 A CN200310111600 A CN 200310111600A CN 1553066 A CN1553066 A CN 1553066A
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Abstract
A universal intellectual buffered gas pressure-reducing valve consists of a step motor, a regulating valve and a pressure sensor. A microprocessor is arranged at the front end of the step motor, of which the control input is connected with the output of PWM of the microprocessor. The output of the pressure sensor is connected with the input of A/D converter of the microprocessor. Compared with the traditional mechanical gas pressure-reducing valve, the said intellectual valve can improve stability of wide pressure regulation.
Description
Technical field
The present invention relates to the gas decompression voltage stabilizing control gear in the industrial control, the decompression voltage stabilizing control of particularly canned high pressure inflammable gas is a kind of universal intelligent buffer type gas reduction valve specifically.
Background technique
Gas pressure reducer is the vitals of the gas pressure control in the industrial control, and traditional gas pressure reducer all is mechanical basically.At present, the control of mechanical type gas pressure reducer all is manually operated type, and they can be divided into two kinds of forms according to control principle: a kind of is direct acting pressure, also claims Spring diaphragm reducing valve.Its direct armrest handle is handled pressure adjusting spring and is regulated delivery pressure, can realize stepless voltage regulation in the regulation range of regulation, and keeps being stable at setting.Another kind is a spring piston formula reduction valve, is the update product of Spring diaphragm reducing valve.It is by the throttling of open-shut device, and the build-up of pressure loss is compeled inlet pressure and taken precautions against low some desired values in the outlet port, and when flow and variation in pressure, the medium energy of utilization own is controlled the constant substantially purpose of outlet pressure.Though mechanism hand dynamic formula reduction valve is simple in structure, and is easy to operate, exist regulation range limited, can only regulate by on-site manual, the not high defective of degree of regulation therefore can only be as the assist control valve in industrial production.Particularly the influence that the decompression voltage stabilizing that control system is required the high canned high pressure inflammable gas of fuel cell electric vehicle is controlled is bigger.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of and can guarantee the constant magnitude of outlet end air pressure along with the size of the variation automatic regulating valve door of entry end air pressure; The setting value of outlet end air pressure size is also can pass through the long-range given universal intelligent buffer type gas reduction valve of communication port upper-position unit by the button manual setting simultaneously, to overcome above-mentioned deficiency.
The technological scheme that the present invention solves the problems of the technologies described above employing is: it is by stepper motor, modulating valve and pressure transducer constitute, wherein the output of stepper motor is connected with the air inlet adjustment valve of modulating valve, it is the intake valve aperture of step motor control modulating valve, pressure transducer is arranged on the outlet side of modulating valve, be used to detect the atmospheric pressure that of modulating valve, be characterized in: also have a microprocessor unit to be arranged on the front end of stepper motor, the Stepping Motor Control input end is connected with pulse duration modulation (PWM) power output module signal output part in the microprocessor unit, and the output terminal of pressure transducer is connected with A/D (mould/number) transducer data input pin in the microprocessor unit;
Above-mentioned modulating valve outlet side also is fixed with a pipe buffers packet, and the suction port of pipe buffers packet communicates with the modulating valve outlet side, and pressure transducer is arranged on the outlet end of pipe buffers packet;
Above-mentioned microprocessor unit is made of embedded microprocessor, pwm power output module and A/D (mould/number) transducer, wherein embedded microprocessor receives from the A/D converter output signal, and after carrying out the intelligence adjusting, thereby the output control signal is given the pwm power output module;
Also be provided with a communication port of communicating by letter on the above-mentioned embedded microprocessor, also be connected with supervisory keyboard and LCD and show with upper-position unit;
The said PWM power output module is by high-power optical isolation amplifier, metal-oxide-semiconductor, voltage-stabiliser tube, diode and resistor constitute, wherein high-power optical isolation amplifier signal input part is connected with the control signal output terminal of embedded microprocessor, high-power optical isolation amplifier signal output part is connected with the base stage (grid) of metal-oxide-semiconductor by resistor, the collector electrode of metal-oxide-semiconductor is by diode output POWER signal, the collector electrode output COM signal of metal-oxide-semiconductor, the grounded-emitter connection of metal-oxide-semiconductor, be connected with a resistor between the base stage of metal-oxide-semiconductor and the emitter, be connected with a voltage-stabiliser tube between the collector electrode of metal-oxide-semiconductor and the emitter, the POWER signal of the output of metal-oxide-semiconductor is connected with the Stepping Motor Control end with the COM signal.
The present invention detects the gas outlet pressure of reduction valve with pressure transducer, control reduction valve work with motor, compare with traditional mechanical type gas pressure reducer, can improve the stability of gas decompression back variation in pressure greatly, and can be in wide range the post-decompression voltage stabilizing value of adjustments of gas.Therefore, universal intelligent buffer type gas reduction valve will progressively replace the gas pressure reducer of traditional mechanical formula.The present invention has added a buffers packet in design, can effectively reduce since the fluctuation of entry end gas pressure size to the influence of outlet end gas pressure size.
Description of drawings
Fig. 1 is an embodiment of the invention structured flowchart.
Fig. 2 is pwm power output module circuit theory diagrams of the present invention.
Fig. 3 is the circuit theory diagrams of embedded microprocessor control unit of the present invention.
Fig. 4 is a buffers packet structure principle chart of the present invention.
Fig. 5 is the software flow pattern of the embodiment of the invention.
Specific embodiments
The invention will be further described below in conjunction with drawings and Examples, but this embodiment should not be construed as limitation of the present invention.
The present invention has pressure transducer, can be fast and detect the air pressure size of outlet end accurately, and convert testing signal to voltage signal and send into the PIC16C7X series microprocessor.Microprocessor software is realized the output of PWM (pulse duration modulation) signal, regulates the open degree of entry end valve by pwm power output module drive stepping motor, thereby reaches the purpose of regulating outlet end air pressure size.It carries control button and LCD and shows, can manually set the voltage stabilizing value after the decompression, and it also has RS323 communication serial ports simultaneously, can communicate by letter with upper-position unit and sets decompression voltage stabilizing value afterwards by upper-position unit.
The embodiment of the invention as shown in Figure 1, it has the RS232 interface of communicating by letter with upper-position unit, to the signal output part of the stepper motor output control signal of reduction valve, accept the signal input part of pressure transducer pressure feedback signal.It comprises embedded microprocessor and pwm power output module, and wherein embedded microprocessor is the PIC16C7X single-chip microcomputer; The pwm power output module carries out power amplification with the pwm signal that embedded microprocessor provides by the bootstrap of being made up of metal-oxide-semiconductor, thereby drive stepping motor is accurately regulated the aperture of entry end modulating valve.Outlet end is fed back to embedded microprocessor and is carried out the A/D conversion by pressure transducer detected pressures signal.
As shown in Figure 2, the pwm signal by embedded microprocessor provides is exaggerated every TLP250 by high-power light, with the drive signal of this amplifying signal as metal-oxide-semiconductor.Form the new pwm signal of new driven high power device between POWER and COM, this signal is just in time reverse with the pwm signal that is provided by embedded microprocessor.In the embodiment of the invention, the PWM switching frequency is 0HZ-10KHZ, and the change in duty cycle scope is bigger.
As shown in Figure 3, the embedded microprocessor of the embodiment of the invention is PIC16C7X, its internal hardware is integrated pwm signal generator and A/D analog-to-digital conversion module.The PIC16C7X single-chip microcomputer carries serial port, forms the RS232 communication serial port with the MAX232 chip.Voltage stabilizing is worth given signal and can be spread out of by upper-position unit by twisted-pair feeder, sends into microprocessor through the RS232 communication serial port.The outlet end pressure feedback signal that pressure transducer provides is the voltage signal of a simulation, can directly receive the road A/D pin of PIC16C7X, certainly needs to give the A/D module for power supply of PIC16C7X, and provides reference voltage for conversion.Given and feedback finally is converted into the variable PWM pulse-width signal output of dutycycle at PIC16C7X through certain algorithm.
As shown in Figure 4, the buffers packet that adds in the embodiment of the invention is the cylinder type pipe, inlet termination modulating valve, and outlet end is embedded with pressure transducer.
As shown in Figure 5 be the software flow pattern of the embodiment of the invention, there are two interruptions in this software flow, one is the interruption (every 20ms) that upper-position unit ECU (RS232 upper-position unit) data of sending cause native system reduction valve ECU, by interrupting sending this required data of upper-position unit constantly, and needed data in the taking-up embodiment of the invention, upgrade the voltage stabilizing setting value.Another is the interruption that the native system timer cycle causes, in this interrupt routine, carries out control algorithm, comprises the sampled pressure feedback signal, and intelligent PID algorithm is upgraded the PWM comparand register then, by regulating the aperture of PWM duty cycle adjustment modulating valve.
In order to accelerate the speed of response of system, the present invention has adopted improved INTELLIGENT PID CONTROL ALGORITHM.
C (k) is a feedback quantity, and R (k) is a specified rate, and E (k) is a deviation.
F(k)＝C(k)+Kd*[C(k)-C(k-1)]；
E(k)＝R(k)-F(k)；
IF E (k)＞0.5V, THEN controlled quentity controlled variable PWM comparison value=195 (dutycycles of maximum value 85%)
IF E (k)＜-0.5V, THEN controlled quentity controlled variable PWM comparison value=17 (dutycycles of maximum value 10%)
ELSE controlled quentity controlled variable U (k)=U (k-1)+Ki*[E (k)-E (k-1)]+Kk*E (k);
IF?U(k)＞5V，THEN?U(k)＝5V；
IF?U(k)＜-5V，THEN?U(k)＝-5V；
Controlled quentity controlled variable PWM comparison value=U (k) * 12+95
The PWM comparison value that draws by control algorithm goes to change the dutycycle of the pwm signal of PIC16C7X output, the aperture of regulating modulating valve thus at last.
The present invention is through actual test, and the embodiment of the invention can well realize the voltage stabilizing control to outlet pressure, and speed of response is fast, and working stability is reliable.
Claims (8)
1, a kind of universal intelligent buffer type gas reduction valve, it is by stepper motor, modulating valve and pressure transducer constitute, wherein the output of stepper motor is connected with the air inlet adjustment valve of modulating valve, it is the intake valve aperture of step motor control modulating valve, pressure transducer is arranged on the outlet side of modulating valve, be used to detect the atmospheric pressure that of modulating valve, it is characterized in that: also have a microprocessor unit to be arranged on the front end of stepper motor, the Stepping Motor Control input end is connected with pulse duration modulation (PWM) power output module signal output part in the microprocessor unit, and the output terminal of pressure transducer is connected with A/D (mould/number) transducer data input pin in the microprocessor unit.
2, universal intelligent buffer type gas reduction valve as claimed in claim 1, it is characterized in that: the modulating valve outlet side also is fixed with a pipe buffers packet, the suction port of pipe buffers packet communicates with the modulating valve outlet side, and pressure transducer is arranged on the outlet end of pipe buffers packet.
3, universal intelligent buffer type gas reduction valve as claimed in claim 1, it is characterized in that: microprocessor unit is made of embedded microprocessor, pwm power output module and A/D converter, wherein embedded microprocessor receives from the A/D converter output signal, and after carrying out the intelligence adjusting, thereby the output control signal is given the pwm power output module.
4, as claim 1 or 3 described universal intelligent buffer type gas reduction valve, it is characterized in that: also be provided with a communication port of communicating by letter on the embedded microprocessor, also be connected with supervisory keyboard and LCD and show with upper-position unit.
5, as claim 1 or 3 described universal intelligent buffer type gas reduction valve, it is characterized in that: the pwm power output module is by high-power optical isolation amplifier, metal-oxide-semiconductor, voltage-stabiliser tube, diode and resistor constitute, wherein high-power optical isolation amplifier signal input part is connected with the control signal output terminal of embedded microprocessor, high-power optical isolation amplifier signal output part is connected with the base stage (grid) of metal-oxide-semiconductor by resistor, the collector electrode of metal-oxide-semiconductor is by diode output POWER signal, the collector electrode output COM signal of metal-oxide-semiconductor, the grounded-emitter connection of metal-oxide-semiconductor, be connected with a resistor between the base stage of metal-oxide-semiconductor and the emitter, be connected with a voltage-stabiliser tube between the collector electrode of metal-oxide-semiconductor and the emitter, the POWER signal of the output of metal-oxide-semiconductor is connected with the Stepping Motor Control end with the COM signal.
6, universal intelligent buffer type gas reduction valve as claimed in claim 2 is characterized in that: the pipe buffers packet is a cylinder type pipe buffers packet.
7, universal intelligent buffer type gas reduction valve as claimed in claim 3, it is characterized in that: embedded microprocessor is the PIC16C7X single-chip microcomputer.
8, universal intelligent buffer type gas reduction valve as claimed in claim 5, it is characterized in that: high-power optical isolation amplifier is TLP250.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101116007A CN1553066A (en) | 2003-12-18 | 2003-12-18 | Universal intelligent buffer gas pressure reducing valves |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101116007A CN1553066A (en) | 2003-12-18 | 2003-12-18 | Universal intelligent buffer gas pressure reducing valves |
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| CN1553066A true CN1553066A (en) | 2004-12-08 |
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| CNA2003101116007A Pending CN1553066A (en) | 2003-12-18 | 2003-12-18 | Universal intelligent buffer gas pressure reducing valves |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100568145C (en) * | 2006-08-02 | 2009-12-09 | 程相魁 | Automatic control device for gas pressure |
| CN102996873A (en) * | 2011-09-08 | 2013-03-27 | 北京航天动力研究所 | Driving type decompression valve capable of automatically adjusting high-accuracy stepping motor |
| CN105031758A (en) * | 2015-08-26 | 2015-11-11 | 苏州登顶医疗科技有限公司 | Automatic medical pressure adjusting intestine cleaner |
| CN105068570A (en) * | 2015-08-04 | 2015-11-18 | 苏州登顶医疗科技有限公司 | Medical enema machine capable of automatically adjusting pressure |
| CN105446383A (en) * | 2015-12-28 | 2016-03-30 | 苟仲武 | Pulse width modulation gas-based depressurizing method and device |
-
2003
- 2003-12-18 CN CNA2003101116007A patent/CN1553066A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100568145C (en) * | 2006-08-02 | 2009-12-09 | 程相魁 | Automatic control device for gas pressure |
| CN102996873A (en) * | 2011-09-08 | 2013-03-27 | 北京航天动力研究所 | Driving type decompression valve capable of automatically adjusting high-accuracy stepping motor |
| CN102996873B (en) * | 2011-09-08 | 2014-07-23 | 北京航天动力研究所 | Driving type decompression valve capable of automatically adjusting high-accuracy stepping motor |
| CN105068570A (en) * | 2015-08-04 | 2015-11-18 | 苏州登顶医疗科技有限公司 | Medical enema machine capable of automatically adjusting pressure |
| CN105031758A (en) * | 2015-08-26 | 2015-11-11 | 苏州登顶医疗科技有限公司 | Automatic medical pressure adjusting intestine cleaner |
| CN105446383A (en) * | 2015-12-28 | 2016-03-30 | 苟仲武 | Pulse width modulation gas-based depressurizing method and device |
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