CN104154949A - Automobile high-voltage cable joint state detection method and system - Google Patents
Automobile high-voltage cable joint state detection method and system Download PDFInfo
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Abstract
The invention brings forward a high-voltage cable joint state detection method. The method comprises the following steps: acquiring a cable joint temperature, a cable current and an environment temperature; respectively establishing membership functions; converting the environment temperature, the cable joint temperature and the cable current into fuzzy values respectively according to the membership functions; determining fuzzy subclasses which the fuzzy values of the environment temperature, the cable joint temperature and the cable current belong to in corresponding domain spaces; and establishing fuzzy inference rules so as to determine cable joint states and generation factors for the over-high cable joint temperature. According to the detection method provided by the embodiment of the invention, whether cable joints are abnormal and reasons why problems occur can be accurately and reliably analyzed, and alarms can be given timely, such that risks caused by abnormities of the cable joints can be avoided, and life and property safety of passengers are guaranteed. The invention also brings forward an automobile high-voltage cable joint state detection system.
Description
Technical field
The present invention relates to field of automobile, particularly a kind of detection method of high voltage cable connector status of automobile and system.
Background technology
At present; under the pressure of energy crisis and environmental protection; new-energy automobile has obtained very fast development in recent years; but more a little security incidents and potential safety hazard have also been exposed simultaneously; according to one's analysis; causing one of principal element that security incident appears in new-energy automobile is that high-voltage cable joint is loosening, thereby causes that contact resistance is excessive causes burning or blast, and this is the dynamic vibration during due to Vehicle Driving Cycle and impacts and can cause to a certain extent the loosening of each connector of cable.Yet, present stage is in the control and detection of new-energy automobile, seldom there is the method that above-mentioned high voltage cable connector status is detected that relates to, even if there is the appearance of some methods that above-mentioned high voltage cable connector status is detected, also do not exist accuracy of detection high and can not determine and cause high-voltage cable joint that abnormal factor occurs, for the maintenance in later stage is made troubles.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, one object of the present invention is to propose a kind of detection method of high voltage cable connector status of automobile, whether the method can analyze accurately, reliably cable splice and occur extremely, and the reason of problem generation, and report to the police in time, thereby can avoid the danger of extremely printing and distributing because of vehicle electrical cable joint, guarantee passenger's safety of life and property.
Another object of the present invention is to propose a kind of detection system of high voltage cable connector status of automobile.
To achieve these goals, the embodiment of first aspect present invention has proposed a kind of detection method of high voltage cable connector status of automobile, comprises the following steps: gather temperature of cable junction, cable current and environment temperature; Set up the membership function of the membership function of described environment temperature, the membership function of described temperature of cable junction and described electric current; According to the membership function of the membership function of the membership function of described environment temperature, described temperature of cable junction and described electric current, described environment temperature, temperature of cable junction and cable current are converted into fuzzy value respectively; The fuzzy subset of the fuzzy value of determining respectively described environment temperature, temperature of cable junction and cable current under in correspondence theory domain space; And set up fuzzy inference rule, to determine described cable splice state and the too high factor of described temperature of cable junction according to described fuzzy inference rule and described fuzzy subset.
According to the detection method of the high voltage cable connector status of the automobile of the embodiment of the present invention, whether application fuzzy control theory occurs extremely detecting to vehicle electrical cable joint, and to causing the abnormal occurrence cause of cable splice to analyze, whether can analyze accurately, reliably cable splice occurs extremely, and the reason of problem generation, and report to the police in time, thereby can avoid the danger of extremely printing and distributing because of vehicle electrical cable joint, guarantee passenger's safety of life and property.For example, when cable splice being detected and cause overheating fault because of loosening oxidation, can be before not causing danger, process, thereby can reduce to greatest extent the generation that causes the hazard events such as the overheated burning causing of cable splice, blast because of the loosening oxidation of vehicle electrical cable joint, guarantee passenger's safety of life and property.
In addition, the detection method of the high voltage cable connector status of automobile according to the above embodiment of the present invention can also have following additional technical characterictic:
In an embodiment of the present invention, the membership function of described environment temperature, the domain space of the membership function of described temperature of cable junction and the membership function of described electric current is all divided into 3 fuzzy subsets, wherein, 3 fuzzy subsets' in the domain space of the membership function of described environment temperature description is respectively: ring temperature is too high, ring temperature is higher and ring temperature is moderate, 3 fuzzy subsets in the domain space of the membership function of described temperature of cable junction are described as: temperature of cable junction is too high, temperature of cable junction is higher and temperature of cable junction is moderate, 3 fuzzy subsets in the domain space of the membership function of described electric current are described as: electric current is excessive, electric current is bigger than normal and electric current is moderate.
In an embodiment of the present invention, wherein, described fuzzy inference rule comprises:
If(A2OR?A3)And(B2OR?B3)And(C2OR?C3)Then?J1；
If?A1And?B1And?C1Then?J2；
If?A1And?B1And(C2OR?C3)Then?J3；
If?A1And?B2Then?J4；
If(A2OR?A3)And?B1And?C1Then?J5；
If?A3And?B1And(C2OR?C3)Then?J6；
If(A2OR?A3)And(B2OR?B3)And?C1Then?J7，
Wherein, A1 represents that electric current is excessive, A2 represents that electric current is bigger than normal, A3 represents that electric current is moderate, B1 represents that temperature of cable junction is too high, B2 represents that temperature of cable junction is higher, B3 represents that temperature of cable junction is moderate, C1 representative ring temperature is too high, C2 representative ring temperature is higher, C3 representative ring temperature is moderate.
In an embodiment of the present invention, the membership function of described environment temperature, the membership function of the membership function of described temperature of cable junction and described electric current by method of expertise, set up.
In an embodiment of the present invention, that described J1 refers to that temperature is normal, J2 refers to that the too high cable splice causing of and environment temperature excessive by electric current is overheated, J3 refers to is overheated by the excessive cable splice causing of electric current, J4 refers to that electric current is excessive and may will cause that cable splice is overheated, please note monitoring, J5 refer to by environment temperature too highly cause that cable splice is overheated, J6 refer to cable splice become flexible cause that cable splice is overheated, J7 finger ring border excess Temperature but do not cause that temperature of cable junction is abnormal.
The embodiment of second aspect present invention has also proposed a kind of detection system of high voltage cable connector status of automobile, comprising: pick-up unit, for detection of temperature of cable junction, cable current and environment temperature, harvester, for gathering described temperature of cable junction, cable current and environment temperature, controller, for setting up the membership function of described environment temperature, the membership function of described temperature of cable junction and the membership function of described electric current, and respectively according to the membership function of described environment temperature, the membership function of described temperature of cable junction and the membership function of described electric current are by described environment temperature, temperature of cable junction and cable current are converted into fuzzy value, and determine respectively described environment temperature, the fuzzy subset of the fuzzy value of temperature of cable junction and cable current under in correspondence theory domain space, and set up fuzzy inference rule, to determine described cable splice state and the too high factor of described temperature of cable junction according to described fuzzy inference rule and described fuzzy subset.
According to the detection system of the high voltage cable connector status of the automobile of the embodiment of the present invention, whether application fuzzy control theory occurs extremely detecting to vehicle electrical cable joint, and to causing the abnormal occurrence cause of cable splice to analyze, whether can analyze accurately, reliably cable splice occurs extremely, and the reason of problem generation, and report to the police in time, thereby can avoid the danger of extremely printing and distributing because of vehicle electrical cable joint, guarantee passenger's safety of life and property.For example, when cable splice being detected and cause overheating fault because of loosening oxidation, can be before not causing danger, process, thereby can reduce to greatest extent the generation that causes the hazard events such as the overheated burning causing of cable splice, blast because of the loosening oxidation of vehicle electrical cable joint, guarantee passenger's safety of life and property.
In addition, the detection system of the high voltage cable connector status of automobile according to the above embodiment of the present invention can also have following additional technical characterictic:
In an embodiment of the present invention, the membership function of described environment temperature, the domain space of the membership function of described temperature of cable junction and the membership function of described electric current is all divided into 3 fuzzy subsets, wherein, 3 fuzzy subsets' in the domain space of the membership function of described environment temperature description is respectively: ring temperature is too high, ring temperature is higher and ring temperature is moderate, 3 fuzzy subsets in the domain space of the membership function of described temperature of cable junction are described as: temperature of cable junction is too high, temperature of cable junction is higher and temperature of cable junction is moderate, 3 fuzzy subsets in the domain space of the membership function of described electric current are described as: electric current is excessive, electric current is bigger than normal and electric current is moderate.
In an embodiment of the present invention, wherein, described fuzzy inference rule comprises:
If(A2OR?A3)And(B2OR?B3)And(C2OR?C3)Then?J1；
If?A1And?B1And?C1Then?J2；
If?A1And?B1And(C2OR?C3)Then?J3；
If?A1And?B2Then?J4；
If(A2OR?A3)And?B1And?C1Then?J5；
If?A3And?B1And(C2OR?C3)Then?J6；
If(A2OR?A3)And(B2OR?B3)And?C1Then?J7，
Wherein, A1 represents that electric current is excessive, A2 represents that electric current is bigger than normal, A3 represents that electric current is moderate, B1 represents that temperature of cable junction is too high, B2 represents that temperature of cable junction is higher, B3 represents that temperature of cable junction is moderate, C1 representative ring temperature is too high, C2 representative ring temperature is higher, C3 representative ring temperature is moderate.
In an embodiment of the present invention, described system also comprises: display device, for showing described cable splice state and the too high factor of described temperature of cable junction; Warning device, for reporting to the police when described temperature of cable junction is too high.
In an embodiment of the present invention, that described J1 refers to that temperature is normal, J2 refers to that the too high cable splice causing of and environment temperature excessive by electric current is overheated, J3 refers to is overheated by the excessive cable splice causing of electric current, J4 refers to that electric current is excessive and may will cause that cable splice is overheated, please note monitoring, J5 refer to by environment temperature too highly cause that cable splice is overheated, J6 refer to cable splice become flexible cause that cable splice is overheated, J7 finger ring border excess Temperature but do not cause that temperature of cable junction is abnormal.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination obviously and is easily understood becoming the description of embodiment, wherein:
Fig. 1 is the process flow diagram of the detection method of the high voltage cable connector status of automobile according to an embodiment of the invention;
Fig. 2 is the principle schematic of the detection method of the high voltage cable connector status of automobile according to an embodiment of the invention;
Fig. 3 is the membership function schematic diagram according to the cable current of the detection method of the high voltage cable connector status of one embodiment of the invention automobile;
Fig. 4 be the high voltage cable connector status of automobile according to an embodiment of the invention detection method the membership function schematic diagram of temperature of cable junction;
Fig. 5 is the membership function schematic diagram of the environment temperature of the detection method of the high voltage cable connector status of automobile according to an embodiment of the invention;
Fig. 6 is the structural drawing of the detection system of the high voltage cable connector status of automobile according to an embodiment of the invention; And
Fig. 7 is the structural drawing of the detection system of the high voltage cable connector status of automobile in accordance with another embodiment of the present invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second " be only for describing object, and can not be interpreted as indication or hint relative importance.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be to be also electrically connected to; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
Below in conjunction with accompanying drawing, describe according to the detection method of the high voltage cable connector status of the automobile of the embodiment of the present invention and system.
Fig. 1 is the process flow diagram of the detection method of the high voltage cable connector status of automobile according to an embodiment of the invention.As shown in Figure 1, the detection method of the high voltage cable connector status of the automobile of the embodiment of the present invention, comprises the following steps:
Step S101, gathers temperature of cable junction, cable current and environment temperature.
Particularly, can detect through but not limited to sensor, for example: by thermopair detection streamer connector temperature, by current sensor detection streamer electric current and by temperature sensor testing environment temperature.After detecting, the data that can detect the sensor by data acquisition equipment gather, and after having gathered, can carry out A/D conversion to above-mentioned data, for follow-up flow process, use.
Step S102, sets up the membership function of the membership function of environment temperature, the membership function of temperature of cable junction and electric current.
As a concrete example, the membership function of the membership function of environment temperature, the membership function of temperature of cable junction and electric current can be set up through but not limited to method of expertise.Wherein, method of expertise is to provide the processing formula of fuzzy message or a kind of method that corresponding weight coefficient value is determined membership function according to expert's practical experience.In many cases, be often the preliminary rough membership function of determining, and then progressively revise and perfect by " study " and practice test, and the foundation of membership function is checked and adjusted to actual effect just.As in Figure 3-5, show respectively the membership function of a kind of membership function of cable current, the membership function of temperature of cable junction and environment temperature.
Step S103, is converted into fuzzy value according to the membership function of the membership function of the membership function of environment temperature, temperature of cable junction and electric current by environment temperature, temperature of cable junction and cable current respectively.According to the membership function of the membership function of the membership function of environment temperature, temperature of cable junction and electric current, environment temperature, temperature of cable junction and cable current are carried out to standardization (obfuscation) respectively.
Step S104, the fuzzy subset of the fuzzy value of determining respectively environment temperature, temperature of cable junction and cable current under in correspondence theory domain space.In a concrete example of the present invention, the domain space of the membership function of the membership function of environment temperature, the membership function of temperature of cable junction and electric current is all divided into 3 fuzzy subsets.Particularly, as shown in Figure 3, to being described as of 3 fuzzy subsets in the domain space of the membership function of electric current: electric current excessive (A1), electric current (A2) bigger than normal and electric current moderate (A3); Being described as 3 fuzzy subsets in the domain space of the membership function of temperature of cable junction as shown in Figure 4: temperature of cable junction too high (B1), temperature of cable junction higher (B2) and temperature of cable junction moderate (B3); As shown in Figure 5,3 fuzzy subsets' in the domain space of the membership function of environment temperature description is respectively: environment temperature too high (C1), environment temperature higher (C2) and environment temperature moderate (C3).
Step S105, sets up fuzzy inference rule, to determine cable splice state and the too high factor of temperature of cable junction according to this fuzzy inference rule and each above-mentioned fuzzy subset.Wherein, cable splice state comprises that cable splice is normal and cable splice is abnormal.In addition, the fuzzy inference rule of the embodiment of the present invention is also three membership functions based on above-mentioned, rule of thumb sets up.For example: fuzzy inference rule comprises:
If(A2OR?A3)And(B2OR?B3)And(C2OR?C3)Then?J1；
If?A1And?B1And?C1Then?J2；
If?A1And?B1And(C2OR?C3)Then?J3；
If?A1And?B2Then?J4；
If(A2OR?A3)And?B1And?C1Then?J5；
If?A3And?B1And(C2OR?C3)Then?J6；
If(A2OR?A3)And(B2OR?B3)And?C1Then?J7，
Wherein, A1 represents that electric current is excessive, A2 represents that electric current is bigger than normal, A3 represents that electric current is moderate, B1 represents that temperature of cable junction is too high, B2 represents that temperature of cable junction is higher, B3 represents that temperature of cable junction is moderate, C1 representative ring temperature is too high, C2 representative ring temperature is higher, C3 representative ring temperature is moderate.
。
In above-mentioned description, that J1 refers to that temperature is normal, J2 refers to that the too high cable splice causing of and environment temperature excessive by electric current is overheated, J3 refers to is overheated by the excessive cable splice causing of electric current, J4 refers to that electric current is excessive and may will cause that cable splice is overheated, please note monitoring, J5 refer to by environment temperature too highly cause that cable splice is overheated, J6 refer to cable splice become flexible cause that cable splice is overheated, J7 finger ring border excess Temperature but do not cause that temperature of cable junction is abnormal.
As a concrete example, be illustrated in figure 2 according to the principle schematic of the detection method of the high voltage cable connector status of the automobile of an embodiment of invention.
Particularly, in the implementation process of the method, use multiple sensors, for example thermopair, current sensor, temperature sensor.Respectively they are arranged in to the position that needs detection.Particularly, thermopair is used for gathering temperature of cable junction, and temperature sensor is used for gathering ambient temperature, and current sensor is used for gathering electric current.In the method implementation process, to the collection of data, are key links for communication and processing in this process of monitoring, the status in forming a connecting link.On the one hand, it can carry out A/D conversion to the information of the thermopair of some, temperature sensor and current sensor output, and completes necessary defencive function, plays a part " concentrating "; On the other hand, in order to realize and the communication of Based Intelligent Control (being fuzzy control) link, to needing in the gatherer process of data, there is data communication interface.Consider the factors such as antijamming capability, preferably, adopt RS-485 serial line interface, with RS-485 serial communication protocol and Based Intelligent Control (fuzzy control) link, carry out communication.Then realize fuzzy diagnosis, furthermore, can be by different detected objects and diagnostic purpose, select corresponding sensor to detect the characteristic quantity information of corresponding state in reflection vehicle operating, then it is carried out to front platform computer pre-service and background computer overall treatment and analysis, the final truly characteristic quantity of faults that extracts, and use expertise and experience etc. to analyze relatively, trouble location location, the order of severity are judged etc., and the fault that state recognition is diagnosed out, for State Maintenance decision-making provides foundation.
Wherein, when certain or some fault occur diagnosis object, different when its output or behavior will be from normal conditions, these differences are called sign.Fuzzy diagnosis according to the real time data that comes from sensor and gather, its feature is difficult to be described by traditional mathematical method.And Fuzzy Processing has the feature of robustness, be particularly suitable for interactional many information to process and uncertain information is analyzed.
Particularly, first utilize membership function (also claiming obfuscation strategy) that input is accurately measured and is converted into fuzzy value, then utilize the fuzzy value of a plurality of parameters and fuzzy rule to carry out reasoning, obtain the fuzzy value of corresponding output quantity.According to ambiguity solution strategy, change the fuzzy value of output quantity into traditional explicit value again, and determine the final factor that temperature of cable junction is too high that causes, and be shown to user, and inform that by the mode of reporting to the police user's automobile storage is in potential safety hazard, process in time.
In conjunction with the membership function that is respectively the membership function of cable current, the membership function of temperature of cable junction and environment temperature shown in Fig. 3, Fig. 4 and Fig. 5, because the current value of temperature of cable junction value, cable and the state at ambient temperature and tested cable splice place have close concern.Therefore,, by engineering experience, in Fig. 3-5, extracted respectively A: the electric current that cable flows through; B: the temperature of cable splice; C: ambient temperature is as the amount of input information of Fuzzy Processing.
In the process of Fuzzy Processing, first the characteristic quantity of each input, (be A: cable current, B: temperature of cable junction and C: environment temperature) from exact value, at its each self-corresponding domain, change fuzzy value into, for example: for above-mentioned environment temperature, assumptions' environment temperature is 25 degree, in fuzzy control theory, suppose 25 degree, can be described as ring temperature, higher also to can be described as ring temperature moderate, according to 25 degree, be subordinate in two fuzzy subsets, in C2 and C3 subset.Be about to the numerical value of the domain in membership function that input value (environment temperature of collection) is transformed into environment temperature in the proper ratio, utilize colloquial style variable to describe the process of measure physical quantities, according to applicable Linguistic Value (as higher and encircle warm clock in encircled temperature), ask the relative degree of membership of this value, for it being carried out on corresponding domain to fuzzy transformation.And domain space corresponding to each characteristic quantity is divided into three different grades.Be A1, A2, A3, B1, B2, B3, C1, C2 and the C3 in Fig. 3-5, and A1 represent that the electric current that electric current electric current excessive, that A2 represents cable is bigger than normal, A3 represents cable of cable is normal, B1 represents that cable interface excess Temperature, B2 represent that cable interface temperature drift, B3 represent that cable interface temperature is normal, C1 represents that environment excess Temperature, C2 represent that environment temperature drift, C3 represent the normothermic fuzzy subset of environment.
Further, shown in Fig. 3-5, according to the temperature of cable junction detecting, cable current and environment temperature, judge that whether tested temperature of cable junction is overheated, if overheated, further judgement causes the factor that tested temperature of cable junction is overheated.Particularly, when inferring for J1 by above-mentioned fuzzy control rule, represent that temperature of cable junction is normal; J2 represents that and environment temperature excessive by electric current is too high and causes that cable splice is overheated; J3 represents to cause that by electric current is excessive cable splice is overheated; J4 represents that electric current is excessive and may, by causing that cable splice is overheated, please note monitoring; J5 represents to cause because environment temperature is too high that cable splice is overheated; J6 represents that cable end is loosening and causes that cable splice is overheated; J7 represents environment excess Temperature but does not cause the abnormal seven kinds of situations of temperature of cable junction.
In above-mentioned example, for determine the reason that causes that cable splice is overheated by fuzzy inference rule.Generally speaking, fuzzy inference rule is that experienced staff rule of thumb formulates.Adopt Reverse Analysis Way of Trouble, which condition finds out each situation needs.And then with IF ... THEN ... several syntactic structures make above-mentioned fuzzy inference rule.Wherein, Reverse Analysis Way of Trouble for example this area expert rule of thumb, suppose when occurring that cable splice is overheated, can rule of thumb obtain the overheated reason of cable splice may be excessive due to electric current, connector temperature is too high and encircle warm too high generation, therefore, adopt and can obtain the reverse thinking of above-mentioned analysis: because electric current is excessive, connector temperature is too high and the too high cable splice that may cause of ring temperature is overheated.
Finally, by above-mentioned obfuscation computing and fuzzy reasoning computing, can obtain accurately, reliably the too high reason of tested temperature of cable junction, and this reason is shown to user, by warning reminding user automobile storage, in potential safety hazard, process in time.
According to the detection method of the high voltage cable connector status of the automobile of the embodiment of the present invention, whether application fuzzy control theory occurs extremely detecting to vehicle electrical cable joint, and to causing the abnormal occurrence cause of cable splice to analyze, whether can analyze accurately, reliably cable splice occurs extremely, and the reason of problem generation, and report to the police in time, thereby can avoid the danger of extremely printing and distributing because of vehicle electrical cable joint, guarantee passenger's safety of life and property.For example, when cable splice being detected and cause overheating fault because of loosening oxidation, can be before not causing danger, process, thereby can reduce to greatest extent the generation that causes the hazard events such as the overheated burning causing of cable splice, blast because of the loosening oxidation of vehicle electrical cable joint, guarantee passenger's safety of life and property.
Further embodiment of the present invention has also proposed the detection system of high voltage cable connector status of the automobile of an embodiment.As shown in Figure 6, this detection system 700, comprising: pick-up unit 710, harvester 720 and controller 730.
Wherein, pick-up unit 710 is for detection of temperature of cable junction, cable current and environment temperature.Be that pick-up unit 710 includes but not limited to: thermopair, current sensor and temperature sensor.
Harvester 720 is for gathering temperature of cable junction, cable current and environment temperature.Be the concrete data of harvester 720 temperature of cable junction, cable current and the environment temperature that detect for collecting and detecting device 710, and the value collecting is carried out to A/D conversion process.
Controller 730 is for setting up the membership function of cable current, the membership function of temperature of cable junction and the membership function of environment temperature, and respectively according to the membership function of environment temperature, the membership function of temperature of cable junction and the membership function of electric current are by environment temperature, temperature of cable junction and cable current are converted into fuzzy value, and further determine respectively environment temperature, the fuzzy subset of the fuzzy value of temperature of cable junction and cable current under in correspondence theory domain space, set up again fuzzy inference rule, to determine cable splice state and the too high factor of temperature of cable junction according to this fuzzy inference rule and fuzzy subset.Wherein, the membership function of environment temperature is, the domain space of the membership function of the membership function of temperature of cable junction and electric current is all divided into 3 fuzzy subsets.And the description to 3 fuzzy subsets in the domain space of the membership function of environment temperature is respectively: ring temperature is too high, ring temperature is higher and ring temperature is moderate; To being described as of 3 fuzzy subsets in the domain space of the membership function of temperature of cable junction: temperature of cable junction is too high, temperature of cable junction is higher and temperature of cable junction is moderate; To being described as of 3 fuzzy subsets in the domain space of the membership function of electric current: electric current is excessive, electric current is bigger than normal and electric current is moderate.
In above-mentioned example, fuzzy inference rule comprises:
If(A2OR?A3)And(B2OR?B3)And(C2OR?C3)Then?J1；
If?A1And?B1And?C1Then?J2；
If?A1And?B1And(C2OR?C3)Then?J3；
If?A1And?B2Then?J4；
If(A2OR?A3)And?B1And?C1Then?J5；
If?A3And?B1And(C2OR?C3)Then?J6；
If(A2OR?A3)And(B2OR?B3)And?C1Then?J7，
Wherein, A1 represents that electric current is excessive, A2 represents that electric current is bigger than normal, A3 represents that electric current is moderate, B1 represents that temperature of cable junction is too high, B2 represents that temperature of cable junction is higher, B3 represents that temperature of cable junction is moderate, C1 representative ring temperature is too high, C2 representative ring temperature is higher, C3 representative ring temperature is moderate.
Further, controller 730 is the fuzzy subsets by determining that respectively the fuzzy value of environment temperature, temperature of cable junction and cable current is subordinate in corresponding domain space, and the fuzzy subset that the fuzzy value of environment temperature, temperature of cable junction and cable current is subordinate in the corresponding domain space mode of applying fuzzy inference rule is determined cable splice state and the too high factor of temperature of cable junction.In above-mentioned fuzzy control rule, that J1 refers to that temperature is normal, J2 refers to that the too high cable splice causing of and environment temperature excessive by electric current is overheated, J3 refers to is overheated by the excessive cable splice causing of electric current, J4 refers to that electric current is excessive and may will cause that cable splice is overheated, please note monitoring, J5 refer to by environment temperature too highly cause that cable splice is overheated, J6 refer to cable splice become flexible cause that cable splice is overheated, J7 finger ring border excess Temperature but do not cause that temperature of cable junction is abnormal.
As shown in Figure 7, the detection system 700 of the high voltage cable connector status of automobile, also can comprise: display device 740 and warning device 750 in accordance with another embodiment of the present invention.
The factor of display device 740 for showing that cable splice state and temperature of cable junction are too high, makes user can recognize clear, easily reason.
Warning device 750 is for reporting to the police when temperature of cable junction is too high, and reminding user automobile storage is in potential safety hazard, and processing in time.
Particularly, in above-mentioned description, cause comprising of factor that temperature of cable junction is too high: excessive and the too high cable splice causing of environment temperature is overheated, overheated by the excessive cable splice causing of electric current, electric current is excessive may will cause that cable splice is overheated by electric current, please note monitoring, by environment temperature too highly cause that cable splice is overheated, cable splice is loosening causes that cable splice is overheated, environment temperature is too high but do not cause that temperature of cable junction is abnormal.
In above-mentioned example, first, pick-up unit 710 detection streamer connector temperatures, cable current and environment temperature, the temperature of cable junction that harvester 720 collecting and detecting devices 710 detect, the concrete data of cable current and environment temperature, then controller 730 is set up the membership function of environment temperature, the membership function of temperature of cable junction and the membership function of electric current, and respectively according to the membership function of environment temperature, the membership function of temperature of cable junction and the membership function of electric current are by environment temperature, temperature of cable junction and cable current are converted into fuzzy value, determine respectively again environment temperature, the fuzzy subset of the fuzzy value of temperature of cable junction and cable current under in correspondence theory domain space, finally, controller 730 is set up fuzzy inference rule, and determine cable splice state and the too high factor of temperature of cable junction according to this fuzzy inference rule and each above-mentioned fuzzy subset, and be shown to user by display device 740, facilitate the clear reason that gets information about of user, the mode reminding user automobile storage that warning device 750 passes through to report to the police is in potential safety hazard, user just can process in time, avoided unnecessary danger to occur, thereby guaranteed user's safety of life and property.
According to the detection system of the high voltage cable connector status of the automobile of the embodiment of the present invention, whether application fuzzy control theory occurs extremely detecting to vehicle electrical cable joint, and to causing the abnormal occurrence cause of cable splice to analyze, whether can analyze accurately, reliably cable splice occurs extremely, and the reason of problem generation, and report to the police in time, thereby can avoid the danger of extremely printing and distributing because of vehicle electrical cable joint, guarantee passenger's safety of life and property.For example, when cable splice being detected and cause overheating fault because of loosening oxidation, can be before not causing danger, process, thereby can reduce to greatest extent the generation that causes the hazard events such as the overheated burning causing of cable splice, blast because of the loosening oxidation of vehicle electrical cable joint, guarantee passenger's safety of life and property.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is by claim and be equal to and limit.
Claims (10)
1. a detection method for the high voltage cable connector status of automobile, is characterized in that, comprises the following steps:
Gather temperature of cable junction, cable current and environment temperature;
Set up the membership function of the membership function of described environment temperature, the membership function of described temperature of cable junction and described electric current;
According to the membership function of the membership function of the membership function of described environment temperature, described temperature of cable junction and described electric current, described environment temperature, temperature of cable junction and cable current are converted into fuzzy value respectively;
The fuzzy subset of the fuzzy value of determining respectively described environment temperature, temperature of cable junction and cable current under in correspondence theory domain space; And
Set up fuzzy inference rule, to determine described cable splice state and the too high factor of described temperature of cable junction according to described fuzzy inference rule and described fuzzy subset.
2. detection method according to claim 1, is characterized in that, the domain space of the membership function of the membership function of described environment temperature, the membership function of described temperature of cable junction and described electric current is all divided into 3 fuzzy subsets,
Wherein, 3 fuzzy subsets' in the domain space of the membership function of described environment temperature description is respectively: ring temperature is too high, ring temperature is higher and ring temperature is moderate, 3 fuzzy subsets in the domain space of the membership function of described temperature of cable junction are described as: temperature of cable junction is too high, temperature of cable junction is higher and temperature of cable junction is moderate, and 3 fuzzy subsets in the domain space of the membership function of described electric current are described as: electric current is excessive, electric current is bigger than normal and electric current is moderate.
3. detection method according to claim 2, is characterized in that, wherein, described fuzzy inference rule comprises:
If(A2OR?A3)And(B2OR?B3)And(C2OR?C3)Then?J1；
If?A1And?B1And?C1Then?J2；
If?A1And?B1And(C2OR?C3)Then?J3；
If?A1And?B2Then?J4；
If(A2OR?A3)And?B1And?C1Then?J5；
If?A3And?B1And(C2OR?C3)Then?J6；
If(A2OR?A3)And(B2OR?B3)And?C1Then?J7，
Wherein, A1 represents that electric current is excessive, A2 represents that electric current is bigger than normal, A3 represents that electric current is moderate, B1 represents that temperature of cable junction is too high, B2 represents that temperature of cable junction is higher, B3 represents that temperature of cable junction is moderate, C1 representative ring temperature is too high, C2 representative ring temperature is higher, C3 representative ring temperature is moderate.
4. according to the detection method described in claim 1-3 any one, it is characterized in that, the membership function of the membership function of described environment temperature, the membership function of described temperature of cable junction and described electric current is set up by method of expertise.
5. detection method according to claim 3, it is characterized in that, that described J1 refers to that temperature is normal, J2 refers to that the too high cable splice causing of and environment temperature excessive by electric current is overheated, J3 refers to is overheated by the excessive cable splice causing of electric current, J4 refers to that electric current is excessive and may will cause that cable splice is overheated, please note monitoring, J5 refer to by environment temperature too highly cause that cable splice is overheated, J6 refer to cable splice become flexible cause that cable splice is overheated, J7 finger ring border excess Temperature but do not cause that temperature of cable junction is abnormal.
6. a detection system for the high voltage cable connector status of automobile, is characterized in that, comprising:
Pick-up unit, for detection of temperature of cable junction, cable current and environment temperature;
Harvester, for gathering described temperature of cable junction, cable current and environment temperature;
Controller, for setting up the membership function of described environment temperature, the membership function of described temperature of cable junction and the membership function of described electric current, and respectively according to the membership function of described environment temperature, the membership function of described temperature of cable junction and the membership function of described electric current are by described environment temperature, temperature of cable junction and cable current are converted into fuzzy value, and determine respectively described environment temperature, the fuzzy subset of the fuzzy value of temperature of cable junction and cable current under in correspondence theory domain space, and set up fuzzy inference rule, to determine described cable splice state and the too high factor of described temperature of cable junction according to described fuzzy inference rule and described fuzzy subset.
7. detection system according to claim 6, is characterized in that, the domain space of the membership function of the membership function of described environment temperature, the membership function of described temperature of cable junction and described electric current is all divided into 3 fuzzy subsets,
Wherein, 3 fuzzy subsets' in the domain space of the membership function of described environment temperature description is respectively: ring temperature is too high, ring temperature is higher and ring temperature is moderate, 3 fuzzy subsets in the domain space of the membership function of described temperature of cable junction are described as: temperature of cable junction is too high, temperature of cable junction is higher and temperature of cable junction is moderate, and 3 fuzzy subsets in the domain space of the membership function of described electric current are described as: electric current is excessive, electric current is bigger than normal and electric current is moderate.
8. detection system according to claim 7, is characterized in that, wherein, described fuzzy inference rule comprises:
If(A2OR?A3)And(B2OR?B3)And(C2OR?C3)Then?J1；
If?A1And?B1And?C1Then?J2；
If?A1And?B1And(C2OR?C3)Then?J3；
If?A1And?B2Then?J4；
If(A2OR?A3)And?B1And?C1Then?J5；
If?A3And?B1And(C2OR?C3)Then?J6；
If(A2OR?A3)And(B2OR?B3)And?C1Then?J7，
Wherein, A1 represents that electric current is excessive, A2 represents that electric current is bigger than normal, A3 represents that electric current is moderate, B1 represents that temperature of cable junction is too high, B2 represents that temperature of cable junction is higher, B3 represents that temperature of cable junction is moderate, C1 representative ring temperature is too high, C2 representative ring temperature is higher, C3 representative ring temperature is moderate.
9. according to the detection system described in claim 6-8 any one, it is characterized in that, also comprise:
Display device, for showing described cable splice state and the too high factor of described temperature of cable junction;
Warning device, for reporting to the police when described temperature of cable junction is too high.
10. detection system according to claim 8, it is characterized in that, that described J1 refers to that temperature is normal, J2 refers to that the too high cable splice causing of and environment temperature excessive by electric current is overheated, J3 refers to is overheated by the excessive cable splice causing of electric current, J4 refers to that electric current is excessive and may will cause that cable splice is overheated, please note monitoring, J5 refer to by environment temperature too highly cause that cable splice is overheated, J6 refer to cable splice become flexible cause that cable splice is overheated, J7 finger ring border excess Temperature but do not cause that temperature of cable junction is abnormal.
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