CN109810883A - A kind of solid state fermentation monitoring system - Google Patents
A kind of solid state fermentation monitoring system Download PDFInfo
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- CN109810883A CN109810883A CN201910255651.8A CN201910255651A CN109810883A CN 109810883 A CN109810883 A CN 109810883A CN 201910255651 A CN201910255651 A CN 201910255651A CN 109810883 A CN109810883 A CN 109810883A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 94
- 238000010563 solid-state fermentation Methods 0.000 title claims abstract description 23
- 230000004151 fermentation Effects 0.000 claims abstract description 58
- 238000000855 fermentation Methods 0.000 claims abstract description 56
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 49
- 229910052760 oxygen Inorganic materials 0.000 claims description 49
- 239000001301 oxygen Substances 0.000 claims description 49
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 48
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 25
- 239000001569 carbon dioxide Substances 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 23
- 238000013500 data storage Methods 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 235000014101 wine Nutrition 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000001953 sensory effect Effects 0.000 description 3
- 235000021419 vinegar Nutrition 0.000 description 3
- 239000000052 vinegar Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- RPRPDTXKGSIXMD-UHFFFAOYSA-N Caproic acid n-butyl ester Natural products CCCCCC(=O)OCCCC RPRPDTXKGSIXMD-UHFFFAOYSA-N 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013523 data management Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000001850 reproductive effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 235000020097 white wine Nutrition 0.000 description 1
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- Apparatus Associated With Microorganisms And Enzymes (AREA)
Abstract
The invention discloses a kind of solid state fermentations to monitor system, is related to fermentation monitoring technical field, including data acquisition module, monitoring module, live display module and control module；Data acquisition module is connect with monitoring module, and monitoring module is connect with live display module and control module respectively；The Fermentation Data of fermentation materials in data collecting module collected jar fermenter, Fermentation Data include at least odor data, gas content data and temperature data；The monitoring module Fermentation Data that acquisition module acquires for receiving data, is sent to live display module for temperature data and shows, be also used to be analyzed and processed Fermentation Data, sends regulating command to control module according to analyzing and processing data；Control module is adjusted according to yeasting of the regulating command to jar fermenter.Fermentation monitoring efficiency is improved, ensure that fermented quality.
Description
Technical field
The present invention relates to fermentation monitoring technical field, especially a kind of solid state fermentation monitors system.
Background technique
Fermentation process quality monitoring is an important ring for control of product quality, is to improve the new wine quality that produces to deposit with subsequent hierarchical
Important evidence is stored up, white wine and vinegar produce and uses conventional solid-state zymotechnique more at present, and fermented grain is presently mainly with vinegar fermented grain monitoring
By manually realizing in conjunction with chemical method.This method stability is low, and chemical monitoring process is cumbersome, time-consuming and laborious, effect
Rate is lower.
Summary of the invention
The present invention regarding to the issue above and technical need, proposes a kind of solid state fermentation monitoring system.
Technical scheme is as follows:
A kind of solid state fermentation monitoring system, comprising: data acquisition module, monitoring module, live display module and control mould
Block；The data acquisition module is connect with the monitoring module, the monitoring module respectively with the live display module and institute
State control module connection；
The Fermentation Data of fermentation materials in the data collecting module collected jar fermenter, the Fermentation Data include at least gas
Taste data, gas content data and temperature data；
The monitoring module is used to receive the Fermentation Data of the data collecting module collected, and the temperature data is sent
It is shown to the live display module, is also used to be analyzed and processed the Fermentation Data, according to analyzing and processing data
Regulating command is sent to the control module；
The control module is adjusted according to yeasting of the regulating command to jar fermenter.
Its further technical solution are as follows: the data acquisition module includes: the odor sensing positioned at jar fermenter head space layer
Device, upper layer temperature sensor, upper layer oxygen sensor, upper layer carbon dioxide sensor positioned at jar fermenter upper layer are located at fermentation
The middle layer temperature sensor in cylinder middle layer, positioned at the lower layer's temperature sensor, lower layer's oxygen sensor, lower layer's dioxy of jar fermenter lower layer
Change carbon sensor, data collecting card；The data collecting card is connect with the monitoring module and each sensor respectively, Ge Gechuan
The data-signal of sensor acquisition is converted to voltage signal through data collecting card and is transferred to the monitoring module；
The smell sensor is for acquiring head space layer C6-C20 odor compound data；
The upper layer temperature sensor, the middle layer temperature sensor, lower layer's temperature sensor are for acquiring fermentation
Temperature data in cylinder；
The upper layer oxygen sensor, lower layer's oxygen sensor are used to detect the oxygen content in jar fermenter；
The upper layer carbon dioxide sensor, lower layer's carbon dioxide sensor are used to detect the titanium dioxide in jar fermenter
Carbon content.
Its further technical solution are as follows: the model USB-6002 of the data collecting card is used for the upper layer temperature
Spend sensor, the middle layer temperature sensor, lower layer's temperature sensor, the upper layer oxygen sensor, lower layer's oxygen
The signal that gas sensor, the upper layer carbon dioxide sensor, lower layer's carbon dioxide sensor acquire is converted into 0 to 10V
Voltage signal be transmitted to the monitoring module.
Its further technical solution are as follows: the model 4200zNose sensor of the smell sensor.
Its further technical solution are as follows: the scene display module includes workshop temperature display device, alarm sum number
According to storage device；
The workshop temperature display device is connect with the monitoring module, for receiving from monitoring module transmission
Temperature data simultaneously carries out real-time display；
The alarm is connect with the monitoring module, for issuing alarm signal in Fermentation Data exception；
The data storage device is connect with the monitoring module, the Fermentation Data for receiving the monitoring module
It is stored, establishes database for optimizing critical-temperature and gas content value.
Its further technical solution are as follows: the control module includes oxygen controller and temperature controller；The oxygen
Controller and the temperature controller are connect with the monitoring module；
The oxygen controller is for being adjusted the gas content in jar fermenter；
The temperature controller is for being adjusted the temperature in jar fermenter.
Its further technical solution are as follows: the oxygen controller includes air pump and gas solenoid valve.
Its further technical solution are as follows: the system of the monitoring module is LabVIEW system.
The method have the benefit that:
System, which is monitored, by solid state fermentation realizes jar fermenter material fermentation process status real time monitoring, the fermentation to jar fermenter
Environment is adjusted, and on the one hand can reduce quality inspection workload when personal monitoring, improves and examines accuracy, is in material most
Good environment improves production efficiency, on the other hand analyzes solid-state fermentation process for technical staff and provides real-time monitoring data, for grinding
Study carefully the fermentating law of entire fermentation process, provides technical support to be further improved solid-state fermentation process.
Detailed description of the invention
Fig. 1 is the systematic schematic diagram of solid state fermentation monitoring system provided by one embodiment of the present invention.
Specific embodiment
The following further describes the specific embodiments of the present invention with reference to the drawings.
Fig. 1 is the systematic schematic diagram of solid state fermentation monitoring system provided by one embodiment of the present invention, as shown in Figure 1, should
System may include: data acquisition module, monitoring module 2, live display module and control module；Data acquisition module and monitoring
Module 2 connects, and monitoring module 2 is connect with live display module and control module respectively.
Optionally, monitoring module 2 is PC monitoring host computer, and the system of monitoring module 2 is LabVIEW system.
LabVIEW system program is installed in PC monitoring host computer.
LabVIEW system can show sensor detected value and the function of time with the detected value of three layers of sensor of real-time display,
And temperature data is transferred to workshop display, detecting that smell, oxygen, carbon dioxide, temperature are more than the progress of critical value when
Alarm.
The Fermentation Data of fermentation materials in data collecting module collected jar fermenter, Fermentation Data include at least odor data,
Gas content data and temperature data.
Optionally, as shown in Figure 1, data acquisition module includes: the smell sensor 5 positioned at jar fermenter head space layer, it is located at
Upper layer temperature sensor 9, upper layer oxygen sensor 8, the upper layer carbon dioxide sensor 7 on jar fermenter upper layer are located in jar fermenter
The middle layer temperature sensor 10 of layer, positioned at the lower layer's temperature sensor 13, lower layer's oxygen sensor 12, lower layer two of jar fermenter lower layer
Aoxidize carbon sensor 11, data collecting card；Data collecting card is connect with monitoring module 2 and each sensor respectively, each sensing
The data-signal of device acquisition is converted to voltage signal through data collecting card and is transferred to monitoring module 2.Illustratively, each in Fig. 1
Sensor is connect with the first data collecting card 6, and the first data collecting card 6 is connect with control module 2, also, the first data acquire
Card 6 is also connect with workshop temperature display device 3, and the voltage signal of conversion can be sent directly to vehicle by the first data collecting card 6
Between temperature indicating device 3 shown.
Optionally, the model PT100 of temperature sensor.
Optionally, the model XMT6058 of workshop temperature display device 3.
Optionally, the model HSTL-O2 of oxygen sensor, pick-up output area: 0-5V.
Optionally, the model HSTL-CO2 of carbon dioxide sensor, pick-up output area: 0-5V.
Data collecting card is used to receive the temperature and gas signal that temperature sensor and gas sensor are sent, and is converted to electricity
Being transmitted to PC monitoring host computer after pressure signal makes temperature and gas content information obtain real-time display.
Optionally, the model USB-6002 of data collecting card, including real-time display function are used for upper layer temperature sensing
Device 9, middle layer temperature sensor 10, lower layer's temperature sensor 13, upper layer oxygen sensor 8, lower layer's oxygen sensor 12, upper layer two
The voltage signal that the signal that oxidation carbon sensor 7, lower layer's carbon dioxide sensor 11 acquire is converted into 0 to 10V is transmitted to monitoring
Module 2.
Smell sensor 5 is for acquiring head space layer C6-C20 odor compound data.
Optionally, the model 4200zNose sensor of smell sensor 5,4200zNose sensor can be to C6-C20
Carbon compound carries out qualitative and quantitative analysis, and analysis uses MicroSense5.0 software.
Smell sensor 5 sends the C6-C20 volatile flavor substance of detection to PC monitoring host computer.
Upper layer temperature sensor 9, middle layer temperature sensor 10, lower layer's temperature sensor 13 are used to acquire the temperature in jar fermenter
Degree evidence.
Upper layer oxygen sensor 8, lower layer's oxygen sensor 12 are used to detect the oxygen content in jar fermenter.
The carbon dioxide that upper layer carbon dioxide sensor 7, lower layer's carbon dioxide sensor 11 are used to detect in jar fermenter contains
Amount.
Pass through upper layer oxygen sensor 8, lower layer's oxygen sensor 12, upper layer carbon dioxide sensor 7, lower layer's carbon dioxide
These gas sensors of sensor 11 detect oxygen content, the carbon dioxide content of jar fermenter the upper and lower, keep away
Exempt from jar fermenter or fermentation vat leaks air phenomenon.
By upper layer temperature sensor 9, middle layer temperature sensor 10, lower layer's temperature sensor 13 to jar fermenter or fermentation vat
Three layers of temperature data of upper, middle and lower carry out ability processing, are used to carry out full temperature detection to material, when there are abnormal conditions in temperature can
To carry out timely early warning and adjusting processing.
By smell sensor 5 to odiferous information acquisition process at the top of jar fermenter, for the acidity to material fermentation, wine degree
And other compounds contents are predicted.
The Fermentation Data that acquisition module acquires for receiving data of monitoring module 2, is sent to live display for temperature data
Module is shown, is also used to be analyzed and processed Fermentation Data, is sent and is adjusted to control module according to analyzing and processing data
Instruction.
Optionally, live display module includes workshop temperature display device 3, alarm 4 and data storage device.
Workshop temperature display device 3 is connect with monitoring module 2, for receiving the temperature data sent from monitoring module 2
And carry out real-time display.
Optionally, workshop temperature display device 3 can also receive the gas data of the transmission of monitoring module 2, for example oxygen contains
Amount, carbon dioxide content, and carry out real-time display.
Alarm 4 is connect with monitoring module 2, for issuing alarm signal in Fermentation Data exception.
In practical applications, the critical value that can preset or determine according to monitoring data Fermentation Data, will in real-time monitoring
The data of acquisition are compared with critical value, issue alarm signal when temperature or oxygen content are more than critical value.Alarm 4 with
PC monitoring host computer connection, when PC monitoring host computer monitors temperature or gas data more than corresponding function of time given threshold
When, PC monitoring host computer issues control signal control alarm 4 and sounds an alarm.
Data storage device is connect with monitoring module 2, and the Fermentation Data for receiving monitoring module 2 stores,
Database is established for optimizing critical-temperature and gas content value.Although not shown in the figure data storage device, in practical application
In, data storage device can be independent storage equipment, be also possible to the memory of PC monitoring host computer.
Control module is adjusted according to yeasting of the regulating command to jar fermenter.The connection control of PC monitoring host computer system
Module, PC monitoring host computer can send regulating command to control module, for adjust in jar fermenter or fermentation vat oxygen content and
Temperature value.
Optionally, control module includes oxygen controller and temperature controller；Oxygen controller and temperature controller with
Monitoring module 2 connects.
Oxygen controller is for being adjusted the gas content in jar fermenter, to adjust micro- life in jar fermenter or fermentation vat
Object improves production efficiency.
Optionally, oxygen controller includes air pump and gas solenoid valve.
Oxygen controller is connect with PC monitoring host computer, is received the control instruction from LabVIEW program, is conveyed by air pump
Gas, gas solenoid valve adjust the oxygen for entering jar fermenter or fermentation vat after receiving control instruction, contain to oxygen in yeasting
Amount is adjusted, to adjust the reproductive status of microorganism, improves production efficiency.
Temperature controller makes fermentation materials reach optimum fermentation temp for the temperature in jar fermenter to be adjusted.
Illustratively, monitoring module 2 is also connect with the second data collecting card 1 in Fig. 1, the second data collecting card 1 and temperature
Controller connection, monitoring module 2 send control signal to the second data collecting card 1 according to data analysis result, and the second data are adopted
Truck 1 is sent to temperature controller after controlling signal conversion, and temperature controller is according to control signal to the temperature in jar fermenter
It is adjusted.It is provided with three layers of temperature controller of upper, middle and lower in Fig. 1, receives the control instruction from LabVIEW program to fermentation
Three layers of temperature of cylinder or fermentation vat upper, middle and lower are controlled, and three layers of temperature of upper, middle and lower are separately adjustable to make temperature reach best fermentation item
Part.
PC monitoring host computer receives temperature, oxygen, carbon dioxide and C6-C20 olfactory signal, C6-C20 odor data, oxygen
Content, carbon dioxide content, temperature data pass through Partial Least Squares dimensionality reduction, and data are using Partial Least Squares to object after dimensionality reduction
The compounds contents such as material acidity, wine degree and ethyl acetate, vinegar father-in-law, butyl hexanoate are fitted, and are realized and are utilized smell sensor pair
Material acidity, wine degree and coherent detection compounds content are predicted.
When solid state fermentation monitoring system in Fig. 1 works, the zNose smell sensor of jar fermenter or fermentation vat head space layer will
C6-C20 odiferous information is transmitted to PC monitoring host computer, and each sensor is by the temperature of acquisition, oxygen content, carbon dioxide content number
It is transmitted to PC monitoring host computer according to by data collecting card, PC monitoring host computer carries out the temperature of acquisition, gas content, olfactory signal
Analysis processing, while temperature data is transferred in workshop temperature display device and carries out real-time display by PC monitoring host computer, will acquire
Temperature data and oxygen content data storage to database, and monitor value and critical value are carried out analysis ratio by PC monitoring host computer
It is right, it is sounded an alarm if monitor value is more than critical value or material is abnormal, issues and instruct to control module, to jar fermenter or fermentation vat
Interior temperature or oxygen content, which is adjusted, makes material local environment reach optimum state.Solid state fermentation monitors system and uses three layers
Acquisition mode can simultaneously be acquired three layers of material state data of jar fermenter or fermentation vat upper, middle and lower, system test speed
Degree is fast, and when smell sensor identifies smell is evaluated with human sensory and is closer to, while repeated multiple times can carry out
It examines, can effectively improve checkability and accuracy.When monitoring, material detection data be passed in monitoring host computer program into
Row analysis processing, material local environment state deviation is adjusted after processing.Monitoring system by solid state fermentation not only can be with
Reinforce the monitoring frequency, improve and examine accuracy, and the workload of quality inspection Yu sensory evaluation personnel can be reduced, for fermentation monitoring
Reliable technical support is provided, control fermentation local environment guarantees optimal conditions of fermentation, improves production efficiency.
In addition, PC monitoring host computer is communicatively coupled by USB interface and data acquisition module, on PC monitoring host computer
LabVIEW monitor system software includes three layer data collecting parts, Data Management Analysis part, display, alarm and storage section.
Jar fermenter or fermentation vat upper, middle and lower three may be implemented in the solid state fermentation monitoring system provided in the embodiment of the present invention
Layer monitoring, can analyze C6-C20 substance using smell sensor, analyze instead of sensory expert smell
With evaluation, multiple jar fermenters or fermentation vat can be monitored in real time simultaneously, and yeastiness can be analyzed, to history number
According to being stored, quality inspection intensity of workers is reduced, improves checkability, control module passes through temperature controller and oxygen
The adjusting of temperature and oxygen content to jar fermenter or fermentation vat may be implemented in controller.
Above-described is only preferred embodiments of the invention, and present invention is not limited to the above embodiments.It is appreciated that this
The other improvements and change that field technical staff directly exports or associates without departing from the spirit and concept in the present invention
Change, is considered as being included within protection scope of the present invention.
Claims (8)
1. a kind of solid state fermentation monitors system characterized by comprising data acquisition module, monitoring module, live display module
And control module；The data acquisition module is connect with the monitoring module, and the monitoring module is shown with the scene respectively
Module is connected with the control module；
The Fermentation Data of fermentation materials in the data collecting module collected jar fermenter, the Fermentation Data include at least smell number
According to, gas content data and temperature data；
The monitoring module is used to receive the Fermentation Data of the data collecting module collected, and the temperature data is sent to institute
It states live display module to be shown, is also used to be analyzed and processed the Fermentation Data, according to analyzing and processing data to institute
It states control module and sends regulating command；
The control module is adjusted according to yeasting of the regulating command to jar fermenter.
2. solid state fermentation according to claim 1 monitors system, which is characterized in that the data acquisition module includes: position
Upper layer temperature sensor, upper layer oxygen sensor, upper layer in the smell sensor of jar fermenter head space layer, positioned at jar fermenter upper layer
Carbon dioxide sensor, the middle layer temperature sensor positioned at jar fermenter middle layer, positioned at jar fermenter lower layer lower layer's temperature sensor,
Lower layer's oxygen sensor, lower layer's carbon dioxide sensor, data collecting card；The data collecting card respectively with the monitoring module
Connected with each sensor, the data-signal of each sensor acquisition through data collecting card be converted to voltage signal be transferred to it is described
Monitoring module；
The smell sensor is for acquiring head space layer C6-C20 odor compound data；
The upper layer temperature sensor, the middle layer temperature sensor, lower layer's temperature sensor are for acquiring in jar fermenter
Temperature data；
The upper layer oxygen sensor, lower layer's oxygen sensor are used to detect the oxygen content in jar fermenter；
The carbon dioxide that the upper layer carbon dioxide sensor, lower layer's carbon dioxide sensor are used to detect in jar fermenter contains
Amount.
3. solid state fermentation according to claim 2 monitors system, which is characterized in that the model of the data collecting card
USB-6002, for by the upper layer temperature sensor, the middle layer temperature sensor, lower layer's temperature sensor, described
Upper layer oxygen sensor, lower layer's oxygen sensor, the upper layer carbon dioxide sensor, lower layer's carbon dioxide sensing
The voltage signal that the signal of device acquisition is converted into 0 to 10V is transmitted to the monitoring module.
4. solid state fermentation according to claim 2 monitors system, which is characterized in that the model of the smell sensor
4200zNose sensor.
5. solid state fermentation according to claim 1 monitors system, which is characterized in that the scene display module includes workshop
Temperature indicating device, alarm and data storage device；
The workshop temperature display device is connect with the monitoring module, for receiving the temperature sent from the monitoring module
Data simultaneously carry out real-time display；
The alarm is connect with the monitoring module, for issuing alarm signal in Fermentation Data exception；
The data storage device is connect with the monitoring module, and the Fermentation Data for receiving the monitoring module carries out
Storage establishes database for optimizing critical-temperature and gas content value.
6. solid state fermentation according to claim 1 monitors system, which is characterized in that the control module includes Oxygen control
Device and temperature controller；The oxygen controller and the temperature controller are connect with the monitoring module；
The oxygen controller is for being adjusted the gas content in jar fermenter；
The temperature controller is for being adjusted the temperature in jar fermenter.
7. solid state fermentation according to claim 6 monitors system, which is characterized in that the oxygen controller include air pump and
Gas solenoid valve.
8. solid state fermentation according to any one of claims 1 to 7 monitors system, which is characterized in that the monitoring module is
System is LabVIEW system.
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