CN110794817A - Fault safety type current output channel diagnosis system and method thereof - Google Patents
Fault safety type current output channel diagnosis system and method thereof Download PDFInfo
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- CN110794817A CN110794817A CN201911221528.0A CN201911221528A CN110794817A CN 110794817 A CN110794817 A CN 110794817A CN 201911221528 A CN201911221528 A CN 201911221528A CN 110794817 A CN110794817 A CN 110794817A
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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
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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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
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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Abstract
The invention discloses a fault safety type current output channel diagnosis system and a method thereof, and the fault safety type current output channel diagnosis system and the method thereof comprise an output control module, a DA module, a load, a sampling circuit, an AD module and a diagnosis comparison module which are connected in sequence, wherein the diagnosis comparison module is connected with the output control module; the DA module and the load are connected with two ends of the switch module, and the switch module is also connected with the diagnosis comparison module; the output control module is used for controlling the DA module to output current; the diagnosis comparison module is used for controlling the switch module, diagnosing the current state and sending the diagnosis result to the output control module. The method can effectively ensure that any module or assembly in the channel has a problem, and can realize the effect of fault guiding safety.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a fault-safe current output channel diagnosis system and a fault-safe current output channel diagnosis method.
Background
When the existing fault safety type current output channel diagnosis system works normally, the output control module controls DA output current, a diagnosis signal enters the diagnosis comparison module through AD recovery and is compared with an output value of the output control module to finish channel diagnosis, if a difference value of a comparison result exceeds an allowable range △, the output channel is abnormal, the diagnosis comparison module feeds the result back to the output control module, and the output control module controls the DA to be disconnected for output so as to achieve the purpose of fault safety.
However, it is not possible to diagnose all dc faults, for example, DA internal crosstalk faults, by comparing the extraction value with the required output value, so the diagnostic coverage is not high, typically only 60%;
moreover, when the output control module fails, the system may enter a dangerous state due to the fact that the diagnosis result cannot be judged or the output channel cannot be shut off.
Disclosure of Invention
The invention aims to solve the technical problems that the existing system and method for diagnosing the current output channel system are not high in diagnosis coverage rate and are easy to enter a dangerous state when a fault occurs, and aims to provide a fault-safe current output channel diagnosis system and a method thereof to solve the problem of diagnosis of a current output channel.
The invention is realized by the following technical scheme:
a failure safety type current output channel diagnosis system and a method thereof comprise an output control module, a DA module, a load, a sampling circuit, an AD module and a diagnosis comparison module which are connected in sequence, wherein the diagnosis comparison module is connected with the output control module;
the DA module and the load are connected with two ends of the switch module, and the switch module is also connected with the diagnosis comparison module;
the output control module is used for controlling the DA module to output current;
the diagnosis comparison module is used for diagnosing the output current state, controlling the switch module and sending the diagnosis result to the output control module.
The diagnostic comparison module further comprises a WatchDog module for monitoring the operating state of the output control module.
When the system is used, the switch module is additionally arranged at the output end and is directly controlled by the diagnosis comparison module, once the diagnosis result is in a fault state, the diagnosis comparison module directly cuts off the output through the switch module, meanwhile, the diagnosis result is transmitted to the output control module, and the output control module also controls the DA module to carry out the cut-off output operation, so that the effect of double insurance is achieved.
Meanwhile, a plurality of WatchDog, namely a WatchDog module, are arranged in the diagnosis comparison module, and the WatchDog monitors the running state of the output control module once the output control module fails. If the operation is overtime, the diagnosis comparison module controls to turn off the output, so that the fault guidance safety is ensured.
A method for diagnosing a fail-safe current output channel comprises the following steps:
(1) the output control module controls the DA module to output current, the diagnosis signal is collected through the AD module and enters the diagnosis comparison module, and is compared with the output value of the output control module, and when a fault occurs, the diagnosis comparison module controls the switch module to be switched off;
(2) when the switch module is switched off, the diagnosis comparison module transmits the diagnosis data to the output control module, and the output control module controls the DA module to switch off the output;
(3) a WatchDog module in the diagnosis comparison module monitors the running state of the output control module;
(4) the sequence of the dog feeding signals received by the WatchDog module is the same as the preset sequence, and the time interval of each WatchDog receiving the dog feeding signals does not exceed the specified time, and the output control module controls the DA module to output current; otherwise, the diagnosis comparison module controls the switch module to be switched off.
And when the system is powered on, the system is in a maintenance state, and the system is tested at regular intervals, the output control module controls the output channel to output the roaming position.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention relates to a fault safety type current output channel diagnosis system and a fault safety type current output channel diagnosis method, which adopt a walking position method to diagnose a current output channel and improve the channel fault diagnosis coverage rate to 99%. A switch module is added at the output end and is directly controlled by a diagnosis comparison module, so that the effect of 'double insurance' is achieved; and a plurality of watchdog are arranged in the diagnosis comparison module to monitor the running state of the output control module, thereby ensuring that any module or assembly in the channel has problems and realizing the effect of fault guiding safety.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a WatchDog module;
fig. 3 is a work flow diagram.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, the system and the method for diagnosing a fail-safe current output channel according to the present invention includes an output control module, a DA module, a load, a sampling circuit, an AD module, and a diagnosis comparison module, which are connected in sequence, wherein the diagnosis comparison module is connected to the output control module;
the DA module and the load are connected with two ends of the switch module, and the switch module is also connected with the diagnosis comparison module;
the output control module is used for controlling the DA module to output current;
the diagnosis comparison module is used for controlling the switch module, diagnosing the output current state and sending the diagnosis result to the output control module.
The diagnostic comparison module further comprises a WatchDog module for monitoring the operating state of the output control module.
Example 2
A fault safety type current output channel diagnosis method comprises the following steps:
(1) the output control module controls the DA module to output current, the diagnosis signal is collected through the AD module and enters the diagnosis comparison module, and is compared with the output value of the output control module, and when a fault occurs, the diagnosis comparison module controls the switch module to be switched off;
(2) when the switch module is switched off, the diagnosis comparison module transmits the diagnosis data to the output control module, and the output control module controls the DA module to switch off the output;
(3) a WatchDog module in the diagnosis comparison module monitors the running state of the output control module;
(4) the sequence of the dog feeding signals received by the WatchDog module is the same as the preset sequence, and the time interval of each WatchDog receiving the dog feeding signals does not exceed the specified time, and the output control module controls the DA module to output current; otherwise, the diagnosis comparison module controls the switch module to be switched off.
Example 3
On the basis of embodiment 2, when the system is powered on, the system is maintained and the system is tested regularly, a walk bit method is adopted to diagnose the current output channel, and the specific operation is that the output control module controls the output of the DA module according to the method shown in table 1 (taking 10-bit SAR type DA as an example).
TABLE 1
When the system works normally, in order to not influence normal output, the diffuse step position method diagnosis is not carried out, and the AD back-sampling value of the diagnosis comparison module is compared with the output value of the current output control module.
If the comparison results are inconsistent, the diagnosis comparison module turns off the switch, meanwhile, the diagnosis results are fed back to the output control module, the output control module controls the DA to carry out turn-off output operation according to the feedback results, and the system is shut down to wait for manual inspection and reset. If the comparison result is consistent, no action is performed, and the output control module controls the DA to output normally.
Example 4
On the basis of embodiment 2, when the system normally works, the program of the output control module is divided into n sections, and a dog feeding program WDn is set at the end of each section of program to send a dog feeding signal to the Watchdog module, so that the running state of the output control module is monitored. And if the sequence of the dog feeding signals received by the Watchdog module in the diagnosis comparison module is the same as the preset sequence and the time interval of receiving the dog feeding signals by each Watchdog does not exceed the specified time, judging that the output channel works normally. Otherwise, the fault of the output control module is judged, and the diagnosis and comparison module immediately turns off the output at the moment, so that the fault guidance safety is ensured.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A fault safety type current output channel diagnosis system is characterized by comprising an output control module, a DA module, a load, a sampling circuit, an AD module and a diagnosis comparison module which are sequentially connected, wherein the diagnosis comparison module is connected with the output control module;
the DA module and the load are connected with two ends of the switch module, and the switch module is also connected with the diagnosis comparison module;
the output control module is used for controlling the DA module to output current;
the diagnosis comparison module is used for diagnosing the output current state, controlling the switch module and sending the diagnosis result to the output control module.
2. The fail-safe current output channel diagnostic system of claim 1, wherein the diagnostic comparison module further comprises a WatchDog module configured to monitor an operational state of the output control module.
3. A method of diagnosing a failsafe current output path including the diagnostic system of claim 1 or claim 2, the method comprising the steps of:
(1) the output control module controls the DA module to output current, the diagnosis signal is collected through the AD module and enters the diagnosis comparison module, and is compared with the output value of the output control module, and when a fault occurs, the diagnosis comparison module controls the switch module to be switched off;
(2) when the switch module is switched off, the diagnosis comparison module transmits the diagnosis data to the output control module, and the output control module controls the DA module to switch off the output;
(3) a WatchDog module in the diagnosis comparison module monitors the running state of the output control module;
(4) the sequence of the dog feeding signals received by the WatchDog module is the same as the preset sequence, and the time interval of each WatchDog receiving the dog feeding signals does not exceed the specified time, and the output control module controls the DA module to output current; otherwise, the diagnosis comparison module controls the switch module to be switched off.
4. The method for diagnosing the fail-safe type current output channel according to claim 3, wherein when the system is powered on, the system is maintained and the system is tested regularly, the output control module controls the output channel to output the walk position.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112526979A (en) * | 2020-12-16 | 2021-03-19 | 中国兵器装备集团自动化研究所 | Serial communication interface diagnosis system and method of multiple redundancy architecture |
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