CN112347569B - Contactor control method, device and equipment conforming to functional safety and storage medium - Google Patents
Contactor control method, device and equipment conforming to functional safety and storage medium Download PDFInfo
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Abstract
The embodiment of the invention discloses a contactor control method, a device, equipment and a storage medium which accord with functional safety. The method comprises the following steps: acquiring on-load power-off data of a contactor, wherein the on-load power-off data comprises on-load power-off times, corresponding power-off temperature and power-off current; determining the current damage degree of the contactor through a preset contactor damage model according to the on-load power-off times, the corresponding power-off temperature and the corresponding power-off current; judging whether the current damage degree is smaller than a first threshold value; if not, judging whether the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value; if the current damage degree is greater than or equal to the first threshold and less than or equal to the second threshold, warning is sent to the user; and if the current damage degree is larger than the second threshold value, cutting off the contactor. The embodiment of the invention realizes more reasonable monitoring of the service life of the contactor by combining the outage temperature of environmental factors, enhances the safety of a control system, and further improves the robustness of the control system through secondary monitoring.
Description
Technical Field
The invention belongs to the technical field of automobile electronic and electrical parts, and particularly relates to a contactor control method, a device, equipment and a storage medium which accord with functional safety.
Background
The contactor is an electric control device widely applied to a control device, and the reliability of the control device is closely related to the service life of the contactor. The contactor is suitable for frequently switching on and off an alternating current and direct current main circuit and a large-capacity control circuit in a long distance, and the service life of the contactor is reduced along with the increase of the on-load power-off times. The service life of the contactor is estimated as accurately as possible, and a specific safety mechanism is set to control the contactor after the contactor is damaged, so that the control device is more reliable, the function safety of the whole vehicle is realized, and the safety of traffic participants is further guaranteed.
With the advancement of science and technology, electric vehicles have begun to be incorporated into the lives of people. The voltage of electric automobile is higher, can reach about 400V usually, and the last battery contactor of electric motor car main function is the power battery of control and connects or break off, and battery contactor's theory of operation is to control the heavy current with the undercurrent, also is a switch, if directly control great current with ordinary switch and can burn the line, and just this problem can not appear through undercurrent control contactor, generally adopts the voltage through comparison contactor both ends at present to judge whether safe and reliable of contactor.
In an electric vehicle, the electric energy in the battery pack supplies power to the driving motor through the contactor, and when the contactor fails (cannot be normally closed or opened), safety problems such as loss of power of the vehicle and the like can be caused, so that the monitoring of the service life of the contactor is particularly important. At present, a battery electric control device judges the service life of a contactor according to the driving mileage or the vehicle running time of a vehicle, the actual use condition of the contactor is not considered, the service life of some contactors is only considered in the process of predicting the closing times or time of the contactor, and the prediction precision is difficult to guarantee.
Motors are widely used in automobiles, such as wiper motors and window lift motors. In the whole life cycle of the automobile, the motor is frequently used in a starting state and a locked-rotor stopping state. The control driving motor is usually an automobile contactor, and the motor has inductance characteristics, so that the service life of the automobile contactor is influenced to a certain extent. Therefore, the application life of the automobile contactor under the condition of automobile motor load becomes an important assessment index of the quality of the automobile contactor.
In the current research on the service life of the contactor, the damage degree of the on-load power failure of the contactor is often determined according to the current and the voltage of the contactor, the influence of environmental factors on the service life of the contactor is not considered in the method, and along with the further improvement of the safety requirement of an automobile, the existing contactor control method does not meet the requirement of functional safety, and improvement is urgently needed.
Disclosure of Invention
The invention aims to provide a contactor control method, a device, equipment and a storage medium which accord with functional safety, so that the service life of a contactor is evaluated by combining environmental factors, and the safety of a control system using the contactor is further ensured, so that the control of the contactor accords with the functional safety requirement.
In order to solve the above problem, in a first aspect, an embodiment of the present invention provides a contactor control method conforming to functional safety, including:
acquiring on-load power-off data of a contactor, wherein the on-load power-off data comprises on-load power-off times, corresponding power-off temperature and power-off current;
determining the current damage degree of the contactor through a preset contactor damage model according to the on-load power-off times, the corresponding power-off temperature and the corresponding power-off current;
judging whether the current damage degree is smaller than a first threshold value;
if not, judging whether the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value;
if the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value, warning is sent to a user;
and if the current damage degree is larger than the second threshold value, cutting off the contactor.
On the other hand, an embodiment of the present invention provides a contactor control device conforming to functional safety, including:
the contactor control device comprises a data acquisition module, a data acquisition module and a control module, wherein the data acquisition module is used for acquiring on-load power-off data of the contactor, and the on-load power-off data comprises on-load power-off times, corresponding power-off temperature and power-off current;
the damage degree determining module is used for determining the current damage degree of the contactor through a preset contactor damage model according to the on-load power-off times, the corresponding power-off temperature and the corresponding power-off current;
the first damage degree judging module is used for judging whether the current damage degree is smaller than a first threshold value;
the second damage degree judging module is used for judging whether the current damage degree is greater than or equal to the first threshold value and less than or equal to the second threshold value if the current damage degree is not greater than or equal to the first threshold value;
the warning module is used for sending a warning to a user if the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value;
and the contactor cutting-off module is used for cutting off the contactor if the current damage degree is greater than the second threshold value.
In another aspect, an embodiment of the present invention provides an electronic device, including a memory and a processor, where the memory stores a computer program executable by the processor, and the processor executes the computer program to implement the contactor control method according to any embodiment of the present invention.
In yet another aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program, where the computer program includes program instructions, and the program instructions, when executed, implement a contactor control method according to functional safety provided by any embodiment of the present invention.
According to the contactor control method conforming to functional safety provided by the embodiment of the invention, the current damage degree of the contactor can be determined in real time according to the on-load power-off times of the contactor and the corresponding power-off temperature and power-off current, the graded monitoring is realized through the first threshold and the second threshold according to the current damage degree of the contactor, a user is warned in advance on the premise of ensuring the safety, more reasonable monitoring of the service life of the contactor is realized through combining the power-off temperature of environmental factors, the safety of a control system is enhanced, the robustness of the control system is further improved through the secondary monitoring, the early warning of the contactor is realized through the first threshold, and the functional safety requirement of contactor control is realized.
Drawings
Fig. 1 is a flowchart of a contactor control method according to functional safety according to an embodiment of the present invention;
fig. 2 is a flowchart of determining a damage model of a contactor according to a second embodiment of the present invention;
FIG. 3 is a life curve diagram according to a second embodiment of the present invention;
fig. 4 is a flowchart for calculating the current damage level according to the second embodiment of the present invention;
fig. 5 is a flowchart of a contactor control method conforming to functional safety according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a contactor control device conforming to functional safety according to a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, or elements, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. It should be noted that when one portion is referred to as being "secured to" another portion, it may be directly on the other portion or there may be an intervening portion. When a portion is said to be "connected" to another portion, it may be directly connected to the other portion or intervening portions may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently, or simultaneously. In addition, the order of the steps may be rearranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Example one
Fig. 1 is a flowchart of a contactor control method according with functional safety according to an embodiment of the present invention, where the method provided in this embodiment is applicable to various control systems including contactors, and the embodiment is described by taking application to an automobile control system as an example, and the specific flow is as follows:
s110, acquiring loaded power-off data of the contactor, wherein the loaded power-off data comprise loaded power-off times, corresponding power-off temperature and power-off current.
The on-load power-off data comprises on-load power-off times of the contactor and power-off temperature and power-off current corresponding to each on-load power-off time, the power-off temperature is the temperature of a contact when the contactor is on-load power-off, and the power-off current is the working current when the contactor is on-load power-off. In the prior art, when the service life of the contactor is analyzed, only the influence of the working current and voltage of the contactor is considered, the service life damage of the contactor is mainly caused by the damage caused by the power-off with load, the damage of the contactor caused by the power-off with load is found to be greatly influenced by the current and the temperature in the power-off process with load once through actual analysis, and therefore the temperature of the working environment parameters of the contactor and the current of the working parameters of the contactor are adopted as the basis for damage analysis in the embodiment. The contactor is applied to the car in this embodiment, and correspondingly, the on-load outage data interrupt electricity temperature should be in the operating temperature range of contactor on the car, and the outage current should be in the operating current range of contactor on the car.
Specifically, be provided with a plurality of sensors among the control system, including temperature sensor and current sensor, control system detects the operating condition of contactor, and the contactor counts a load outage number of times when taking a load outage every time to gather outage temperature and outage electric current corresponding constantly.
And S120, determining the current damage degree of the contactor through a preset contactor damage model according to the on-load power-off times, the corresponding power-off temperature and the corresponding power-off current.
The preset contactor damage model is designed based on the working characteristics of a contactor on an automobile and is designed according to an on-load test performed under a simulated automobile working environment, the damage degree of the contactor is calculated, the input of the damage degree is the on-load power-off times, the corresponding power-off temperature and the corresponding power-off current, the output is the current damage degree of the contactor, and the current damage degree is the sum of the on-load power-off damage degrees of the contactor every time. And generating damage experimental data or simulation data of the contactor according to different power-off temperatures and different power-off currents by using the contactor damage model.
Specifically, a preset contactor damage model is preset in the automobile control system, and after the automobile control system obtains the on-load power-off times, the corresponding power-off temperature and the corresponding power-off current, the on-load power-off times, the corresponding power-off temperature and the corresponding power-off current are input into the contactor damage model, and the current damage degree of the contactor is directly obtained.
And S130, judging whether the current damage degree is smaller than a first threshold value.
The first threshold value is the damage degree warning standard that sets up according to the in-service use demand of contactor on the car for show the life-span warning line of contactor, when the current damage degree of contactor reaches first threshold value, show that the life-span surplus of contactor has triggered car safety precaution, if follow-up can not guarantee timely change and should make preparation in advance, in order to cause the road accident because of the contactor inefficacy, if the current damage degree of contactor does not reach first threshold value, be less than first threshold value promptly, show that the contactor is in safe operating condition, the contactor can not lead to the fact the influence to car safety. The first threshold may be set according to different contactors and different vehicle application scenarios, and is not limited herein.
Specifically, a first threshold value is set in the control system, and after the control system obtains the current damage degree through the contactor damage model, the current damage degree and the first threshold value are compared.
And S140, if not, judging whether the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value.
In this embodiment, a second threshold is set in addition to the first threshold, the second threshold is used to indicate a damage degree when the contactor is stuck due to the load outage of the maximum current, and the maximum current is determined by a specific working condition of the contactor. The second threshold value indicates that the vehicle has failed to operate properly for safety purposes at this time, and the contactor needs to be replaced or repaired.
Specifically, a second threshold value is further set in the control system, after it is determined that the current damage degree of the contactor is not smaller than the first threshold value, it is further required to judge whether the current damage degree reaches the second threshold value, namely, whether the current damage degree is greater than or equal to the first threshold value and smaller than or equal to the second threshold value, if yes, the second threshold value is not reached, it is indicated that the contactor can still work normally, but the remaining life is not long, if not, it is indicated that the safety alarm of the automobile is reached, at this time, the contactor cannot work normally, and the automobile needs to stop running.
And S150, if the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value, warning is sent to a user.
When the control system judges that the current damage degree is greater than or equal to the first threshold value and less than or equal to the second threshold value, the residual service life of the contactor is not long, at the moment, a warning is sent to a user through the output device, so that the user is reminded to carry out the operation of replacing the contactor or prolonging the service life of the contactor, and the safety of automobile operation is improved.
And S160, if the current damage degree is larger than the second threshold value, cutting off the contactor.
When the control system judges that the current damage degree is not smaller than the first threshold value and does not meet the requirements of being larger than or equal to the first threshold value and being smaller than or equal to the second threshold value, the current damage degree is obviously larger than the second threshold value, and at the moment, the contactor has the defects that the adhesion phenomenon can occur after the subsequent one-time or multiple-time loading power failure, so that the fault is caused, the contactor is directly cut off at the moment, and the vehicle accident caused by the fault of the contactor is avoided. In this embodiment, when it is determined that the current loss degree is greater than the second threshold value, an alarm is issued directly, and the contactor is turned off within (1000-5000) ms, the alarm is different from the warning, the warning is used for reminding a user of the limited remaining life of the contactor, and the alarm is used for reminding the user that the contactor cannot work for safety.
With the development of industry, functional safety is a new requirement for a control system, in the control scheme of the contactor at present, a method for calculating the service life of the contactor is provided only by experience and the like, but a contactor control method conforming to the functional safety is not provided, although vehicle faults caused by the service life of the contactor are avoided to a certain extent, the vehicle fault does not conform to the functional safety requirement, and the safety is not high. Therefore, in the embodiment, the contactor damage model is obtained through testing the contactor, and different safety level control (grading early warning is realized through the first threshold and the second threshold) is realized by using the contactor damage model, so that the safety controllability is improved, the functional safety requirement of modern industry is met, and the safety of the automobile control system is further improved.
The contactor control method according with functional safety provided by the embodiment can determine the current damage degree of a contactor in real time according to the on-load power-off times of the contactor on an automobile, the corresponding power-off temperature and the corresponding power-off current, realize graded monitoring through the first threshold value and the second threshold value according to the current damage degree of the contactor, warn a user in advance on the premise of ensuring safety, send out an alarm signal when necessary and cut off the contactor within (1000-5000) ms. More reasonable monitoring of the service life of the contactor is achieved through combination of the power-off temperature of the environmental factors, only an alarm signal is output to remind a driver in the first-level monitoring, the safety of a control system is enhanced while good robustness is kept in the second-level monitoring, and then the safety requirement of the control function of the contactor is met.
Example two
The present embodiment is implemented on the basis of the first embodiment, and is different from the first embodiment in that the present example further provides a determination process of a contactor damage model, and specifically includes, as shown in fig. 2:
s210, determining standard data of the number of times of on-load power failure allowed in the full life cycle of the contactor at different power failure temperatures and different power failure currents by an experimental or simulation method.
The standard data is the service life condition of contactors of different contact materials under the condition of different power-off temperatures and different power-off currents, and the damage models of the contactors of each fixed contact material are different, so that the standard data need to be acquired independently. In this embodiment, there are two ways to obtain the standard data: actual experiments or simulation simulations, however, may also obtain standard data in other ways, and are not limited herein.
Specifically, the specific process of acquiring the standard data comprises the following steps a-e:
a. within the range of the power-off temperature and the power-off current intensity which can be borne by the contact material of the contactor, the temperature T is fixed, I1 is used as the initial current intensity, n-time on-load power-off is continuously carried out, the contactor is adhered at the (n + 1) th time, and the point d at the moment is recorded n (I 1 ，T)；
b. Fixing the temperature T, adjusting the current increase Δ I 1 Continuously carrying out n-1 times of power off with load, generating adhesion at the n-th contactor, and recording the point d at the moment n-1 (I 1 +ΔI 1 ，T)；
c. Fixing the temperature T, adjusting the current increase amount Delta I x Continuously carrying out n-x times of power off with load, generating adhesion at the n-x +1 th time of contactor, and recording the point d at the moment n-x (I 1 +ΔI x T); repeating the steps until 1 time of on-load power-off is obtained, and generating a point d for adhesion of the contactor when the 2 nd time of on-load power-off is carried out 1 (I 1 +ΔI y ，T)；
d. Taking the delta T as a temperature fixed change value, and repeating the steps a, b and c to obtain points which are allowed to have different times of on-load power failure at different temperatures;
e. and recording the point data obtained above, and obtaining large data of the number of times of power failure with load allowed in the full life cycle of the contactor as standard data.
And S220, determining a life curve of the contactor according to the standard data.
After the standard data are obtained, the life curve of the contactor is drawn according to the standard data, and the life curves of the contactors obtained by using different heat-resistant materials as contactor contacts are different. Ideally, in the (I, T) state of the same contactor, when the power is off with continuous load, the damage degree caused by each power off with load is the same, and therefore the same contactor is located on the same contour line, the specific contour line may be as shown in the life curve graph (each life curve is regarded as a contour line) shown in fig. 3, the abscissa in fig. 3 represents the power off current when the power is off with load of the contactor, the unit is mA, the ordinate is the power off temperature, the unit is the temperature, the entity curve in fig. 3 is the life curve of the contactor, and the ordinate is respectively from top to bottom: allowing 1 on-load power-off curve, allowing 2 on-load power-off curves the method allows 3 times of power-off curves with load to be used for 8230, allows n-1 times of power-off curves with load and allows n times of power-off curves with load.
The allowable 1-time on-load power-off curve in fig. 3 represents: the load power-off occurring at any point of the current intensity and temperature on the curve is allowed to occur only once in the whole life cycle of the contactor, the load power-off brings 100% damage degree to the contactor, and the contactor cannot be used continuously after the load power-off occurs; the n-times on-load power-off curve is allowed to represent: the on-load power failure occurring at any point of the current intensity and the temperature on the curve is allowed to occur n times in the whole life cycle of the contactor, the damage degree of the on-load power failure to the contactor is dn =1/n, and the damage degree of the contactor is increased along with the increase of the on-load power failure times. After n times of on-load power failure, 100% damage degree is brought to the contactor, and the contactor cannot be used continuously.
More specifically, in fig. 3, T1 is the lossless temperature, I1 is the lossless current: when the power-off current is less than or equal to I1, no damage is caused when any power-off temperature is subjected to load power-off; when the power-off temperature is less than or equal to T1, no damage is caused when the load power-off occurs under any power-off current. Within the range of the power-off temperature and the power-off current intensity which can be borne by the contact material of the contactor, all service life curves approach to two straight lines of I1 and T1 infinitely along with the increase of the power-off temperature or the power-off current. I1 and T1 are determined by simulation or experiment according to the selected material of the contactor contact.
As further shown in fig. 3: under the same outage current, the higher the outage temperature is, the greater the damage degree caused by the load outage of the contactor every time is generated, and the fewer the load outage times are allowed to occur; under the same outage temperature, the larger the outage current is, the larger the damage degree caused by the load outage of the contactor is, and the fewer the load outage times are allowed to occur.
And S230, determining a preset contactor damage model based on the life curve, wherein the contactor damage model is used for determining the damage degree of the contactor according to the power-off temperature and the power-off current.
The contactor damage model is a model for calculating the damage degree of the contactor, and can be realized by programming and used for calculating the real-time damage degree (namely the current damage degree) of the contactor according to the standard data and the loaded power-off data.
More specifically, the process of calculating the current damage degree by the contactor damage model, i.e. step S120, as shown in fig. 4, includes steps S121-122:
and S121, determining a single damage degree corresponding to each on-load power failure according to the on-load power failure times, the corresponding power failure temperature and the corresponding power failure current.
The calculation process of the single damage degree is as follows:
determining corresponding single damage degree d based on the service life curve according to the power-off temperature and the power-off current corresponding to the number of power-off times with load mk (I,T)：
And S122, counting the sum of the single damage degrees to obtain the current damage degree of the contactor.
The current damage degree is obtained by accumulating the single damage degree:
for a contactor, the number of power-off times is k, and m is used k Indicating the maximum number of times that an on-load outage can occur, e.g. m, as indicated by a life curve corresponding to k on-load outages 1 M represents the maximum number of times of on-load power-off in the life curve corresponding to the first on-load power-off 2 The maximum frequency of the occurrence of the load power failure in the service life curve corresponding to the second load power failure is shown, and the current damage degree D is obtained p Comprises the following steps:
more specifically, in an embodiment, as shown in fig. 5, a step S100 for setting the first threshold and the second threshold should be further included before the step S110:
and S100, determining the first threshold and the second threshold according to the standard data and the controllability requirement on the controller, wherein the first threshold represents the minimum damage degree for triggering alarm, and the second threshold represents the maximum damage degree for which contactor adhesion can occur when the maximum current is in load outage for one time.
The first threshold is the minimum damage degree for triggering alarm, the higher the safety requirement of the controller is, the smaller the first threshold is set, and the second threshold can be directly determined according to standard data.
The embodiment further supplements a determination process for providing a contactor damage model and a specific process for calculating the current damage degree by the contactor damage model on the basis of the first embodiment, and further explains the determination of the current damage degree by combining the power-off temperature and the power-off current so as to ensure the safe use of the contactor and realize the functional safety requirement of a control circuit containing the contactor on the automobile.
EXAMPLE III
Fig. 6 is a schematic structural diagram of a contactor control device 300 meeting functional safety according to a third embodiment of the present invention, where the device can execute a contactor control method meeting functional safety according to any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method, and the device provided in this embodiment can be applied to contactor control on different vehicles, and specifically includes:
the data acquisition module 310 is configured to acquire on-load power-off data of the contactor, where the on-load power-off data includes on-load power-off times, and corresponding power-off temperature and power-off current;
the damage degree determining module 320 is configured to determine a current damage degree of the contactor according to the on-load power failure times, the corresponding power failure temperature and the corresponding power failure current through a preset contactor damage model;
a first damage degree determining module 330, configured to determine whether the current damage degree is smaller than a first threshold;
a second damage degree determining module 340, configured to determine whether the current damage degree is greater than or equal to the first threshold and less than or equal to the second threshold if the current damage degree is not greater than the first threshold;
a warning module 350, configured to send a warning to the user if the current damage degree is greater than or equal to a first threshold and less than or equal to a second threshold;
and a contactor cut-off module 360, configured to cut off the contactor if the current damage degree is greater than the second threshold value.
More specifically, in one embodiment, the contactor control apparatus further comprises a standard data generation module, a life curve determination module, and a damage model determination module, wherein:
the standard data generation module is used for determining standard data of the number of times of on-load power failure allowed in the full life cycle of the contactor at different power failure temperatures and different power failure currents by an experimental or simulation method;
the service life curve determining module is used for determining a service life curve of the contactor according to the standard data;
and the damage model determining module is used for determining a preset contactor damage model based on the service life curve, and the contactor damage model is used for determining the damage degree of the contactor according to the power-off temperature and the power-off current.
More specifically, in an embodiment, the contactor control device conforming to functional safety further includes a threshold value determining module, configured to determine the first threshold value and the second threshold value according to the standard data and the controllability requirement on the controller before acquiring the on-load outage data of the contactor, where the first threshold value indicates a minimum damage degree that triggers an alarm, and the second threshold value indicates a maximum damage degree that a contactor adhesion may occur when a maximum-current on-load outage occurs again.
More specifically, in an embodiment, the damage degree determining module 320 includes a single damage degree determining unit and a damage degree accumulating unit, wherein:
the single damage degree determining unit is used for determining the single damage degree corresponding to each on-load power failure according to the on-load power failure times, the corresponding power failure temperature and the corresponding power failure current;
and the damage degree accumulation unit is used for counting the sum of the single damage degrees to obtain the current damage degree of the contactor.
More specifically, in an embodiment, the single damage degree determination unit is specifically configured to determine the corresponding single damage degree d based on the life curve according to the power-off temperature and the power-off current corresponding to the number of times of power-off with load mk (I,T)：
More specifically, in one embodiment, the contactor control device for safety function further comprises: the sensing module comprises a temperature sensor and a current sensor, the temperature sensor is used for detecting the contact temperature of the contactor, and the current sensor is used for detecting the communicating current of the contactor.
More specifically, in one embodiment, the functionally safe contactor control device further comprises a contactor switch and a meter:
a contactor switch for controlling the disconnection of the contactor;
and the meter is used for displaying a warning, and the warning comprises the current damage degree and the residual on-load power-off times.
The embodiment provides a contactor control device who accords with function safety, can confirm the current damage degree of contactor in real time according to the power-off temperature and the outage electric current that the area of contactor carried outage number of times and correspond, realize hierarchical control through first threshold value and second threshold value according to the current damage degree of contactor, warn the user in advance under the prerequisite of assurance security, realize more reasonable contactor life-span control through the outage temperature that combines environmental factor, control system's security has been strengthened, the robustness of control system has further been improved in the second grade control, the early warning in advance of contactor has been realized through first threshold value, the functional safety requirement of contactor control has been realized.
Example four
Fig. 7 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention, where the electronic device includes a memory 410 and a processor 420, the number of the processors 420 in the device may be one or more, and one processor 420 is taken as an example in fig. 7; the memory 410 and the processor 420 in the device may be connected by a bus or other means, and fig. 7 illustrates the connection by a bus as an example.
The memory 410 may be used as a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the contactor control method in the embodiment of the present invention (for example, the data acquisition module 310, the damage degree determination module 320, the first damage degree determination module 330, the second damage degree determination module 340, the warning module 350, and the contactor cut-off module 360 in the contactor control device). The processor 420 executes various functional applications and data processing of the electronic device by executing software programs, instructions and modules stored in the memory 410, so as to implement the above-mentioned contactor control method conforming to the functional safety.
Wherein the processor 420 is configured to run the computer executable program stored in the memory 410 to implement the steps of: step S110, acquiring loaded power-off data of the contactor, wherein the loaded power-off data comprise loaded power-off times, corresponding power-off temperature and power-off current; step S120, determining the current damage degree of the contactor through a preset contactor damage model according to the on-load power-off times, the corresponding power-off temperature and the corresponding power-off current; step S130, judging whether the current damage degree is smaller than a first threshold value; step S140, if not, judging whether the current damage degree is more than or equal to a first threshold value and less than or equal to a second threshold value; step S150, if the current damage degree is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, a warning is sent to a user; and step S160, if the current damage degree is larger than the second threshold value, cutting off the contactor.
Of course, the electronic device provided in the embodiment of the present invention is not limited to the above method operations, and may also perform related operations in the contactor control method conforming to the functional safety provided in any embodiment of the present invention.
The memory 410 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating device, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 410 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 410 can further include memory located remotely from the processor 620, which can be connected to electronic devices through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
This embodiment provides an electronic equipment, can confirm the current damage degree of contactor in real time according to the on-load outage number of times and the outage temperature and the outage electric current that correspond of contactor, realize hierarchical control through first threshold value and second threshold value according to the current damage degree of contactor, warn the user in advance under the prerequisite of assurance security, realize more reasonable contactor life-span control through the outage temperature that combines environmental factor, control system's security has been strengthened, the robustness of control system has further been improved in the second grade control.
EXAMPLE five
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a contactor control method conforming to functional safety, where the contactor control method conforming to functional safety includes:
acquiring on-load power-off data of a contactor, wherein the on-load power-off data comprises on-load power-off times, corresponding power-off temperature and power-off current;
determining the current damage degree of the contactor through a preset contactor damage model according to the on-load power-off times and the corresponding power-off temperature and power-off current;
judging whether the current damage degree is smaller than a first threshold value;
if not, judging whether the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value;
if the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value, warning is sent to a user;
and if the current damage degree is larger than the second threshold value, cutting off the contactor.
Of course, the storage medium provided by the embodiments of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the above method operations, and may also execute the related operations in the contactor control method provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. With this understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes instructions for enabling a computer device (which may be a personal computer, a device, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the electronic device, the included units and modules are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A contactor control method conforming to functional safety is characterized by comprising the following steps:
acquiring on-load power-off data of a contactor, wherein the on-load power-off data comprises on-load power-off times, corresponding power-off temperature and power-off current;
determining the current damage degree of the contactor through a preset contactor damage model according to the on-load power-off times and the corresponding power-off temperature and power-off current;
judging whether the current damage degree is smaller than a first threshold value;
if not, judging whether the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value;
if the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value, warning is sent to a user;
if the current damage degree is larger than the second threshold value, the contactor is cut off;
before the on-load outage data of the contactor is obtained, the method further comprises the following steps:
determining standard data of the number of times of power failure with load allowed by the full life cycle of the contactor at different power failure temperatures and different power failure currents by an experimental or simulation method;
determining a life curve of the contactor according to the standard data;
and determining a preset contactor damage model based on the life curve, wherein the contactor damage model is used for determining the damage degree of the contactor according to the power-off temperature and the power-off current.
2. The method for controlling a contactor according to claim 1, wherein before acquiring the on-load outage data of the contactor, the method further comprises:
and determining the first threshold value and the second threshold value according to the standard data and the controllability requirement of the controller, wherein the first threshold value represents the minimum damage degree for triggering alarm, and the second threshold value represents the maximum damage degree for which the contactor is stuck when the maximum current load power-off occurs once again.
3. The contactor control method according to claim 1, wherein the determining a current damage degree of the contactor according to the on-load power-off times and the corresponding power-off temperature and power-off current through a preset contactor damage model comprises:
determining a single damage degree corresponding to each on-load power failure according to the on-load power failure times, the corresponding power failure temperature and the corresponding power failure current;
and counting the sum of the single damage degrees to obtain the current damage degree of the contactor.
4. The functionally safe contactor control method according to claim 3, wherein the determining the single damage degree corresponding to each on-load power failure according to the number of on-load power failures and the corresponding power failure temperature and power failure current comprises:
determining corresponding single damage degree d based on the service life curve according to the power-off temperature and the power-off current corresponding to the number of power-off times with load mk (I,T)：
5. A contactor control device that is functionally safe, comprising:
the contactor control device comprises a data acquisition module, a data acquisition module and a control module, wherein the data acquisition module is used for acquiring on-load power-off data of the contactor, and the on-load power-off data comprises on-load power-off times, corresponding power-off temperature and power-off current;
the damage degree determining module is used for determining the current damage degree of the contactor through a preset contactor damage model according to the on-load power-off times, the corresponding power-off temperature and the corresponding power-off current;
the first damage degree judging module is used for judging whether the current damage degree is smaller than a first threshold value;
the second damage degree judging module is used for judging whether the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value if the current damage degree is not greater than the first threshold value;
the warning module is used for sending a warning to a user if the current damage degree is greater than or equal to a first threshold value and less than or equal to a second threshold value;
the contactor cutting-off module is used for cutting off the contactor if the current damage degree is larger than the second threshold value;
the contactor control device further comprises a standard data generation module, a life curve determination module and a damage model determination module, wherein:
the standard data generation module is used for determining standard data of the number of on-load power-off times allowed by the contactor in the full life cycle at different power-off temperatures and different power-off currents by an experimental or simulation method;
the service life curve determining module is used for determining a service life curve of the contactor according to the standard data;
and the damage model determining module is used for determining a preset contactor damage model based on the service life curve, and the contactor damage model is used for determining the damage degree of the contactor according to the power-off temperature and the power-off current.
6. The functionally safe contactor control device according to claim 5, further comprising:
the sensing module comprises a temperature sensor and a current sensor, the temperature sensor is used for detecting the contact temperature of the contactor, and the current sensor is used for detecting the communicating current of the contactor.
7. The functionally safe contactor control device according to claim 5, further comprising:
a contactor switch for controlling the disconnection of the contactor;
and the meter is used for displaying a warning, and the warning comprises the current damage degree and the residual on-load power-off times.
8. An electronic device, comprising:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the functionally safe contactor control method according to any of claims 1-4.
9. A computer-readable storage medium, characterized in that the storage medium stores a computer program comprising program instructions which, when executed, implement the functionally safe contactor control method according to any of claims 1-4.
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| US7444266B2 (en) * | 2006-03-21 | 2008-10-28 | Abb Technology Ltd. | Control system for a transformer or reactor |
| CN102055176A (en) * | 2009-11-03 | 2011-05-11 | 北汽福田汽车股份有限公司 | Method for protecting electric vehicle contactor and battery management system |
| JP5568586B2 (en) * | 2012-03-27 | 2014-08-06 | 株式会社東芝 | Electronic device, failure determination method, life estimation method |
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