CN105116789A - CAN bus-based distributed control system for controlled atmosphere fresh-keeping transport vehicle and realization method thereof - Google Patents
CAN bus-based distributed control system for controlled atmosphere fresh-keeping transport vehicle and realization method thereof Download PDFInfo
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- CN105116789A CN105116789A CN201510400993.6A CN201510400993A CN105116789A CN 105116789 A CN105116789 A CN 105116789A CN 201510400993 A CN201510400993 A CN 201510400993A CN 105116789 A CN105116789 A CN 105116789A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25232—DCS, distributed control system, decentralised control unit
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Abstract
The invention discloses a CAN bus-based distributed control system for a controlled atmosphere fresh-keeping transport vehicle and the realization method thereof. The control system comprises a main controller node and communication nodes, wherein the main controller node comprises an ARM control panel with a CAN communication port and a touch screen, the main controller node is installed on the instrument panel in the cab of the controlled atmosphere fresh-keeping transport vehicle, the communication nodes comprise a pressure chamber node, a vehicle head node, a negative pressure chamber node and a fresh-keeping chamber node, and the main controller node communicates with the communication nodes through CAN buses. The communication medium employs bi-core leads with shielding net. Four communication nodes of the pressure chamber node, the vehicle head node, the negative pressure chamber node and the fresh-keeping chamber node and the main control node are employed, and communication among all nodes is carried out through CAN buses. The working stability of the system is improved. The control system has fault diagnosis function, acquires the sensor parameter scope and performer working current of the communication nodes on a real-time basis, and determines the working state of devices after calculation and analysis.
Description
Technical field
The invention belongs to agricultural products fresh-keeping technical field of transportation, particularly a kind of controlled atmosphere preservation transport vehicle dcs based on CAN and its implementation.
Background technology
Controlled atmosphere technology be a kind of can the method for storing and refreshing of comprehensive regulation environment temperature, relative humidity and gas componant.Controlled atmosphere preservation transport vehicle can realize the real-time monitoring of the environmental parameters such as temperature in compartment, relative humidity, oxygen purity and carbon dioxide volume fraction, improves the preservation quality of storing agricultural product, reduces the wastage.Controlled atmosphere transportation technology has certain Research foundation abroad, but mainly concentrate on the research of controlled atmosphere container, and the transportation equipment of long-distance transport and design is waited for sea-freight, and controlled atmosphere equipment is main based on nitrogen making machine, has that cost is high, controlled atmosphere speed slow and control the shortcomings such as extensive.China starts late at controlled atmosphere technical elements, and basis is comparatively weak, and controlled atmosphere transportation equipment control system control accuracy is not high, is badly in need of a kind of stable, that control accuracy is high control system being applicable to controlled atmosphere preservation transport vehicle of development.
Summary of the invention
An object of the present invention is the shortcoming and defect overcoming prior art, provides a kind of controlled atmosphere preservation transport vehicle dcs based on CAN.
Another object of the present invention is to the implementation method that a kind of controlled atmosphere preservation transport vehicle dcs based on CAN is provided.
In order to reach above-mentioned first object, the present invention by the following technical solutions:
Based on a controlled atmosphere preservation transport vehicle dcs for CAN, comprise master controller node and communication node; Described master controller node is made up of the ARM control panel with CAN communication mouth and touch-screen, and master controller node installation is on controlled atmosphere preservation transport vehicle bridge instrumentation platform; Described communication node is made up of pressure chamber's node, headstock node, negative pressure chamber's node and fresh-keeping chamber node; Master controller node and communication node adopt CAN communication, and communication media selects the wire of two core ribbon gauze screens; Described master controller node accepts through pressure chamber's node, headstock node, negative pressure chamber's node and the pretreated data of fresh-keeping chamber node, and to this data analysis, calculating and record, send control command to communication node, realize the control to each actuating equipment, complete controlled atmosphere, refrigeration and humidification function.
Preferably, described ARM control panel adopts embedded system STM32 control chip, by RS232 serial ports and touch-screen or robot calculator communication, realizes uploading and downloading of data.
Preferably, described touch-screen is serial ports touch-screen, can realize selecting storing agricultural product kind, arranging fresh-keeping environments parameter, in real time display fresh-keeping environments parameter and call historical data curve.
Preferably, described pressure chamber node is become with ultrasonic atomization head group by dividing plate temperature sensor; Described pressure chamber node installation is on pressure chamber's backboard; Described dividing plate place temperature sensor is arranged on perforate dividing plate; Described ultrasonic atomization head has 4 groups, and often group is made up of 4 ultrasonic humidifying oscillators, is arranged in ultrasonic humidifier; Described dividing plate place temperature sensor is connected with pressure chamber's node by wire with ultrasonic atomization head.
Preferably, described headstock node is made up of electromagnetic clutch for compressor, defrosting solenoid valve, condenser fan, liquid outlet electromagnetic valve and boost electromagnetic valve; Described headstock node installation is below bridge instrumentation platform; Described electromagnetic clutch for compressor, defrosting solenoid valve, condenser fan are the Control Component of refrigeration unit; Described liquid outlet electromagnetic valve and boost electromagnetic valve are the Control Component from supercharging liquid nitrogen container; Described electromagnetic clutch for compressor, defrosting solenoid valve, condenser fan, liquid outlet electromagnetic valve are connected with headstock node by wire with boost electromagnetic valve.
Preferably, described negative pressure chamber node is made up of air inlet electromagnetic valve and blower fan; Described negative pressure chamber node installation is on negative pressure chamber's backboard; Described air inlet electromagnetic valve is made up of 2 solenoid valves, is arranged on negative pressure chamber's side plate; Described blower fan is made up of 3 DC fans, is uniformly distributed, and is arranged in pressure chamber's lower plate side by side; Described air inlet electromagnetic valve and blower fan are connected with negative pressure chamber node by wire.
Preferably, described fresh-keeping chamber node is made up of temperature sensor, humidity sensor, oxygen concentration sensor, gas concentration lwevel sensor, ethylene concentration sensor and exhaust solenoid valve; Described fresh-keeping chamber node installation is on the side plate of fresh-keeping chamber rear end; Described temperature sensor, humidity sensor, oxygen concentration sensor, gas concentration lwevel sensor and ethylene concentration sensor adjacent layout successively, is arranged on the side plate of fresh-keeping chamber rear end; Described exhaust solenoid valve is made up of 2 solenoid valves, is arranged on the side plate of the fresh-keeping chamber back lower place; Described temperature sensor, humidity sensor, oxygen concentration sensor, gas concentration lwevel sensor, ethylene concentration sensor and exhaust solenoid valve are connected with negative pressure chamber node by wire.
Preferably, master controller node adopts μ COS-iii operating system, and system is divided into data acquisition, history data store, environmental parameter regulation and control, equipment working state monitoring, man-machine interaction task, historical data are uploaded and system debug 7 tasks.
Preferably, described control system has fault diagnosis functions, can the sensor parameters scope of Real-time Collection communication node and actuator working current, through calculating, analyzing, the duty of decision device, and shows on the touchscreen.
In order to reach above-mentioned second object, the present invention by the following technical solutions:
Based on a control method for the controlled atmosphere preservation transport vehicle dcs of CAN, comprise the steps:
S1, Initialize installation: the power supply of system connects by managerial personnel, operation control system, by touch-screen target setting environmental parameter scope, comprise dividing plate place temperature value, ambient temperature value, envionmental humidity value, ambient oxygen concentration value, ambient carbon dioxide concentration value and environment ethylene concentration value, enter step S2;
S2, system enter self-check program, and master controller node detects ARM control panel and communication node CAN communication condition in real time, judge that whether Current communications is normal, in this way, enter step S3; As no, enter step S9;
Dividing plate place temperature value in S3, the current fresh-keeping chamber of communication node Real-Time Monitoring, ambient temperature value, envionmental humidity value, ambient oxygen concentration value, ambient carbon dioxide concentration value and environment ethylene concentration value, and by CAN and master controller node communication, whether contrastive detection value is in targeted environment parameter area, in this way, actuator work is stopped; As no, enter step S4, S5, S6, S7 simultaneously;
S4, judge that whether current actual measurement oxygen density value is higher than aimed oxygen concn scope, in this way, the boost electromagnetic valve of master controller node orders headstock node and liquid outlet electromagnetic valve work, the exhaust solenoid valve work of order fresh-keeping chamber node, the blower fan work of order negative pressure chamber node, starts controlled atmosphere; As no, stop controlled atmosphere, enter step S9;
S5, judge that whether current observed temperature value is higher than target temperature range, in this way, the electromagnetic clutch for compressor of master controller node orders headstock node and condenser fan work, the blower fan work of order negative pressure chamber node, start refrigeration, when refrigeration is more than 2h, after defrosting electromagnetic valve work 15min, continue refrigeration again; As no, stop refrigeration, enter step S9;
S6, judge current actual measurement dividing plate place temperature value whether during lower than setting dividing plate place temperature value, in this way, master controller node and communication node communication, the gentle tune of order refrigeration quits work, until actual measurement dividing plate place temperature value is higher than setting dividing plate place temperature value; As no, return step S4, S5;
S7, judge that whether current actual measurement carbon dioxide and ethylene concentration value are higher than carbon dioxide and ethylene concentration scope, in this way, the air inlet electromagnetic valve of master controller node orders negative pressure chamber node and blower fan work, the exhaust solenoid valve work of order fresh-keeping chamber node, starts ventilation; As no, stop ventilation, enter step S9;
Whether normally the sensor parameters scope of S8, main control node Real-time Collection pressure chamber node, headstock node, negative pressure chamber's node and fresh-keeping chamber node and actuator working current, judge current sensor and actuator work, in this way, return step S3; As no, enter step S9;
S9, control system fault alarm, in touch-screen display failure code.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
The first, with the Contrast on effect of prior art, control system of the present invention is obviously better than existing control system on interference free performance.
The second, the intelligence that the Expected Results of technical solution of the present invention can realize controlled atmosphere preservation transport vehicle accurately controls, and improves system reliability.
Three, control system of the present invention adopts the Design of Distributed Control System based on CAN, and performance history is efficient, is conducive to shortening the development time, improves programming efficiency.
Four, control core of the present invention adopts STM32 control chip, there is the low and feature that control accuracy is high of cost, system centralized procurement integrate, computing, control, communication, fault diagnosis, data record with the function such as to upload.
Five, control system of the present invention adopts μ COS-iii operating system, system application layer code structure is divided into, data acquisition, history data store, environmental parameter regulation and control, equipment working state monitoring, man-machine interaction task, historical data are uploaded and 7 tasks such as system debug, simplify programming process.
Six, touch-screen of the present invention has good human-computer interaction function, is conducive to the simple and convenient operation of driver.
Seven, the present invention proposes 4 communication nodes and the master controller nodes such as pressure chamber's node, headstock node, negative pressure chamber's node and fresh-keeping chamber node, adopt CAN communication between each node, improve the job stability of system.
Eight, control system of the present invention has fault diagnosis functions, can the sensor parameters scope of Real-time Collection communication node and actuator working current, analyzes as calculated, the duty of decision device.
Nine, control system of the present invention has good expansibility, can increase or change the node of difference in functionality as required, and not affect the communication function of other node.
Accompanying drawing explanation
Fig. 1 is a kind of controlled atmosphere preservation transport vehicle dcs based on CAN of patent of the present invention;
Fig. 2 is patent CAN dcs one-piece construction schematic diagram of the present invention.
Drawing reference numeral illustrates:
1, exhaust solenoid valve; 2, fresh-keeping chamber node; 3, temperature sensor; 4, humidity sensor; 5, oxygen concentration sensor; 6, gas concentration lwevel sensor; 7, ethylene concentration sensor; 8, negative pressure chamber's node; 9, air inlet electromagnetic valve; 10, blower fan; 11, condenser fan; 12, defrosting solenoid valve; 13, electromagnetic clutch for compressor; 14, touch-screen; 15, master controller node; 16, headstock node; 17, boost electromagnetic valve; 18, from supercharging liquid nitrogen container; 19, liquid outlet electromagnetic valve; 20, ultrasonic atomization head; 21, ultrasonic humidifier; 22, dividing plate place temperature sensor; 23, pressure chamber's node; 24, carburetor; 25, refrigeration unit evaporator.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
Based on a controlled atmosphere preservation transport vehicle dcs for CAN, comprise master controller node 15 and communication node.Master controller node is made up of the ARM control panel with CAN communication mouth and touch-screen 14, is arranged on controlled atmosphere preservation transport vehicle bridge instrumentation platform.Described ARM control panel adopts embedded system STM32 control chip, by RS232 serial ports and robot calculator communication, realizes uploading and downloading of data, by RS232 serial ports and touch-screen communication.Described touch-screen is serial ports screen, can realize selecting storing agricultural product kind, arranging fresh-keeping environments parameter, in real time display fresh-keeping environments parameter and call the functions such as historical data curve.Described ARM control panel adopts embedded system STM32 control chip, by RS232 serial ports and robot calculator communication, realizes uploading and downloading of data.Described communication node comprises pressure chamber's node 23, headstock node 16, negative pressure chamber's node 8 and fresh-keeping chamber node 2.
As shown in Figure 1, described pressure chamber node 23 is arranged on pressure chamber's backboard, be made up of dividing plate place temperature sensor 22 and ultrasonic atomization head 20, dividing plate place temperature sensor is arranged on perforate dividing plate, ultrasonic atomization head has 4 groups, often group is made up of 4 ultrasonic humidifying oscillators, is arranged in ultrasonic humidifier 21, and dividing plate place temperature sensor is connected with pressure chamber's node by wire with ultrasonic atomization head.Described headstock node 16 is arranged on below bridge instrumentation platform, be made up of electromagnetic clutch for compressor 13, defrosting solenoid valve 12, condenser fan 11, liquid outlet electromagnetic valve 19 and boost electromagnetic valve 17, electromagnetic clutch for compressor, defrosting solenoid valve, condenser fan are the Control Component of refrigeration unit, liquid outlet electromagnetic valve and boost electromagnetic valve are the Control Component from supercharging liquid nitrogen container 18, and electromagnetic clutch for compressor, defrosting solenoid valve, condenser fan, liquid outlet electromagnetic valve are connected with headstock node by wire with boost electromagnetic valve.Described negative pressure chamber node 8 is arranged on negative pressure chamber's backboard, be made up of air inlet electromagnetic valve 9 and blower fan 10, air inlet electromagnetic valve is made up of 2 solenoid valves, be arranged on negative pressure chamber's side plate, blower fan is made up of 3 DC fans, be uniformly distributed, be arranged in pressure chamber's lower plate side by side, air inlet electromagnetic valve and blower fan are connected with negative pressure chamber node by wire.Described fresh-keeping chamber node 2 is arranged on the side plate of fresh-keeping chamber rear end, be made up of temperature sensor 3, humidity sensor 4, oxygen concentration sensor 5, gas concentration lwevel sensor 6, ethylene concentration sensor 7 and exhaust solenoid valve 1, each sensor is adjacent layout successively, be arranged on the side plate of fresh-keeping chamber rear end, exhaust solenoid valve 1 is made up of 2 solenoid valves, be arranged on the side plate of the fresh-keeping chamber back lower place, each sensor and exhaust solenoid valve 1 are connected with negative pressure chamber node by wire.
As shown in Figure 2, described master controller node is accepted through pretreated data of communication node such as pressure chamber's node 23, headstock node 16, negative pressure chamber's node 8 and fresh-keeping chamber nodes 2 by CAN, and to this data analysis, calculating and record, send control command to communication node, realize the control to each actuating equipment, complete the functions such as controlled atmosphere, refrigeration and humidification.During controlled atmosphere, boost electromagnetic valve 17 and liquid outlet electromagnetic valve 19 energising make liquid nitrogen be transformed into nitrogen spray into envelope by flowing through carburetor 24 from supercharging liquid nitrogen container 18 with constant pressure, open exhaust solenoid valve 1 and realize gas exchanges, reduce the oxygen purity in envelope; During refrigeration, refrigeration unit evaporator 25 reduces the temperature in envelope under the effect of blower fan 10; During humidification, ultrasonic humidifier 21 works, and forms water smoke, increases the relative humidity in envelope under the effect of blower fan 10.Described pressure chamber node, headstock node, negative pressure chamber's node are connected with master controller node by CAN with fresh-keeping chamber node 2, and realize two-way communication, and CAN communication media selects the wire of two core ribbon gauze screens, gauze screen two-terminal-grounding.Described master controller node has fault diagnosis functions simultaneously, can the sensor parameters scope of Real-time Collection communication node and actuator working current, through calculating, analyzing, the duty of decision device, and shows on the touchscreen.
Above-mentioned a kind of controlled atmosphere preservation transport vehicle dcs based on CAN, concrete methods of realizing according to the following steps:
S1, Initialize installation: the power supply of system connects by managerial personnel, operation control system, by touch-screen target setting environmental parameter scope, comprise dividing plate place temperature value, ambient temperature value, envionmental humidity value, ambient oxygen concentration value, ambient carbon dioxide concentration value and environment ethylene concentration value, enter step S2;
S2, system enter self-check program, and master controller node detects ARM control panel and communication node CAN communication condition in real time, judge that whether Current communications is normal, in this way, enter step S3; As no, enter step S9;
Dividing plate place temperature value in S3, the current fresh-keeping chamber of communication node Real-Time Monitoring, ambient temperature value, envionmental humidity value, ambient oxygen concentration value, ambient carbon dioxide concentration value and environment ethylene concentration value, and by CAN and master controller node communication, whether contrastive detection value is in targeted environment parameter area, in this way, actuator work is stopped; As no, enter step S4, S5, S6, S7 simultaneously;
S4, judge that whether current actual measurement oxygen density value is higher than aimed oxygen concn scope, in this way, the boost electromagnetic valve of master controller node orders headstock node and liquid outlet electromagnetic valve work, the exhaust solenoid valve work of order fresh-keeping chamber node, the blower fan work of order negative pressure chamber node, starts controlled atmosphere; As no, stop controlled atmosphere, enter step S9;
S5, judge that whether current observed temperature value is higher than target temperature range, in this way, the electromagnetic clutch for compressor of master controller node orders headstock node and condenser fan work, the blower fan work of order negative pressure chamber node, start refrigeration, when refrigeration is more than 2h, after defrosting electromagnetic valve work 15min, continue refrigeration again; As no, stop refrigeration, enter step S9;
S6, judge current actual measurement dividing plate place temperature value whether during lower than setting dividing plate place temperature value, in this way, master controller node and communication node communication, the gentle tune of order refrigeration quits work, until actual measurement dividing plate place temperature value is higher than setting dividing plate place temperature value; As no, return step S4, S5;
S7, judge that whether current actual measurement carbon dioxide and ethylene concentration value are higher than carbon dioxide and ethylene concentration scope, in this way, the air inlet electromagnetic valve of master controller node orders negative pressure chamber node and blower fan work, the exhaust solenoid valve work of order fresh-keeping chamber node, starts ventilation; As no, stop ventilation, enter step S9;
Whether normally the sensor parameters scope of S8, main control node Real-time Collection pressure chamber node, headstock node, negative pressure chamber's node and fresh-keeping chamber node and actuator working current, judge current sensor and actuator work, in this way, return step S3; As no, enter step S9;
S9, control system fault alarm, in touch-screen display failure code.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. based on a controlled atmosphere preservation transport vehicle dcs for CAN, it is characterized in that, comprise master controller node and communication node; Described master controller node is made up of the ARM control panel with CAN communication mouth and touch-screen, and master controller node installation is on controlled atmosphere preservation transport vehicle bridge instrumentation platform; Described communication node is made up of pressure chamber's node, headstock node, negative pressure chamber's node and fresh-keeping chamber node; Master controller node and communication node adopt CAN communication, and communication media selects the wire of two core ribbon gauze screens; Described master controller node accepts through pressure chamber's node, headstock node, negative pressure chamber's node and the pretreated data of fresh-keeping chamber node, and to this data analysis, calculating and record, send control command to communication node, realize the control to each actuating equipment, complete controlled atmosphere, refrigeration and humidification function.
2. the controlled atmosphere preservation transport vehicle dcs based on CAN according to claim 1, it is characterized in that, described ARM control panel adopts embedded system STM32 control chip, by RS232 serial ports and touch-screen or robot calculator communication, realizes uploading and downloading of data.
3. the controlled atmosphere preservation transport vehicle dcs based on CAN according to claim 1, it is characterized in that, described touch-screen is serial ports touch-screen, can realize selecting storing agricultural product kind, arranging fresh-keeping environments parameter, in real time display fresh-keeping environments parameter and call historical data curve.
4. the controlled atmosphere preservation transport vehicle dcs based on CAN according to claim 1, is characterized in that, described pressure chamber node is become with ultrasonic atomization head group by dividing plate temperature sensor; Described pressure chamber node installation is on pressure chamber's backboard; Described dividing plate place temperature sensor is arranged on perforate dividing plate; Described ultrasonic atomization head has 4 groups, and often group is made up of 4 ultrasonic humidifying oscillators, is arranged in ultrasonic humidifier; Described dividing plate place temperature sensor is connected with pressure chamber's node by wire with ultrasonic atomization head.
5. the controlled atmosphere preservation transport vehicle dcs based on CAN according to claim 1, is characterized in that, described headstock node is made up of electromagnetic clutch for compressor, defrosting solenoid valve, condenser fan, liquid outlet electromagnetic valve and boost electromagnetic valve; Described headstock node installation is below bridge instrumentation platform; Described electromagnetic clutch for compressor, defrosting solenoid valve, condenser fan are the Control Component of refrigeration unit; Described liquid outlet electromagnetic valve and boost electromagnetic valve are the Control Component from supercharging liquid nitrogen container; Described electromagnetic clutch for compressor, defrosting solenoid valve, condenser fan, liquid outlet electromagnetic valve are connected with headstock node by wire with boost electromagnetic valve.
6. the controlled atmosphere preservation transport vehicle dcs based on CAN according to claim 1, is characterized in that, described negative pressure chamber node is made up of air inlet electromagnetic valve and blower fan; Described negative pressure chamber node installation is on negative pressure chamber's backboard; Described air inlet electromagnetic valve is made up of 2 solenoid valves, is arranged on negative pressure chamber's side plate; Described blower fan is made up of 3 DC fans, is uniformly distributed, and is arranged in pressure chamber's lower plate side by side; Described air inlet electromagnetic valve and blower fan are connected with negative pressure chamber node by wire.
7. the controlled atmosphere preservation transport vehicle dcs based on CAN according to claim 1, it is characterized in that, described fresh-keeping chamber node is made up of temperature sensor, humidity sensor, oxygen concentration sensor, gas concentration lwevel sensor, ethylene concentration sensor and exhaust solenoid valve; Described fresh-keeping chamber node installation is on the side plate of fresh-keeping chamber rear end; Described temperature sensor, humidity sensor, oxygen concentration sensor, gas concentration lwevel sensor and ethylene concentration sensor adjacent layout successively, is arranged on the side plate of fresh-keeping chamber rear end; Described exhaust solenoid valve is made up of 2 solenoid valves, is arranged on the side plate of the fresh-keeping chamber back lower place; Described temperature sensor, humidity sensor, oxygen concentration sensor, gas concentration lwevel sensor, ethylene concentration sensor and exhaust solenoid valve are connected with negative pressure chamber node by wire.
8. the controlled atmosphere preservation transport vehicle dcs based on CAN according to claim 1, it is characterized in that, master controller node adopts μ COS-iii operating system, and system is divided into data acquisition, history data store, environmental parameter regulation and control, equipment working state monitoring, man-machine interaction task, historical data are uploaded and system debug 7 tasks.
9. the controlled atmosphere preservation transport vehicle dcs based on CAN according to claim 1, it is characterized in that, described control system has fault diagnosis functions, can the sensor parameters scope of Real-time Collection communication node and actuator working current, through calculating, analyzing, the duty of decision device, and show on the touchscreen.
10., based on an implementation method for the controlled atmosphere preservation transport vehicle dcs of CAN, it is characterized in that, comprise the steps:
S1, Initialize installation: the power supply of system connects by managerial personnel, operation control system, by touch-screen target setting environmental parameter scope, comprise dividing plate place temperature value, ambient temperature value, envionmental humidity value, ambient oxygen concentration value, ambient carbon dioxide concentration value and environment ethylene concentration value, enter step S2;
S2, system enter self-check program, and master controller node detects ARM control panel and communication node CAN communication condition in real time, judge that whether Current communications is normal, in this way, enter step S3; As no, enter step S9;
Dividing plate place temperature value in S3, the current fresh-keeping chamber of communication node Real-Time Monitoring, ambient temperature value, envionmental humidity value, ambient oxygen concentration value, ambient carbon dioxide concentration value and environment ethylene concentration value, and by CAN and master controller node communication, whether contrastive detection value is in targeted environment parameter area, in this way, actuator work is stopped; As no, enter step S4, S5, S6, S7 simultaneously;
S4, judge that whether current actual measurement oxygen density value is higher than aimed oxygen concn scope, in this way, the boost electromagnetic valve of master controller node orders headstock node and liquid outlet electromagnetic valve work, the exhaust solenoid valve work of order fresh-keeping chamber node, the blower fan work of order negative pressure chamber node, starts controlled atmosphere; As no, stop controlled atmosphere, enter step S9;
S5, judge that whether current observed temperature value is higher than target temperature range, in this way, the electromagnetic clutch for compressor of master controller node orders headstock node and condenser fan work, the blower fan work of order negative pressure chamber node, start refrigeration, when refrigeration is more than 2h, after defrosting electromagnetic valve work 15min, continue refrigeration again; As no, stop refrigeration, enter step S9;
S6, judge current actual measurement dividing plate place temperature value whether during lower than setting dividing plate place temperature value, in this way, master controller node and communication node communication, the gentle tune of order refrigeration quits work, until actual measurement dividing plate place temperature value is higher than setting dividing plate place temperature value; As no, return step S4, S5;
S7, judge that whether current actual measurement carbon dioxide and ethylene concentration value are higher than carbon dioxide and ethylene concentration scope, in this way, the air inlet electromagnetic valve of master controller node orders negative pressure chamber node and blower fan work, the exhaust solenoid valve work of order fresh-keeping chamber node, starts ventilation; As no, stop ventilation, enter step S9;
Whether normally the sensor parameters scope of S8, main control node Real-time Collection pressure chamber node, headstock node, negative pressure chamber's node and fresh-keeping chamber node and actuator working current, judge current sensor and actuator work, in this way, return step S3; As no, enter step S9;
S9, control system fault alarm, in touch-screen display failure code.
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| CN106325336A (en) * | 2016-08-19 | 2017-01-11 | 广东锐捷安全技术股份有限公司 | Refrigeration and freshness preservation box control system |
| CN108657640A (en) * | 2017-10-13 | 2018-10-16 | 翁延鸣 | Storage facilities and its control system |
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| CN108657640A (en) * | 2017-10-13 | 2018-10-16 | 翁延鸣 | Storage facilities and its control system |
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