CN116056433B - Heat dissipation method for OBC measurement and control cabinet of vehicle-mounted charger - Google Patents
Heat dissipation method for OBC measurement and control cabinet of vehicle-mounted charger Download PDFInfo
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- CN116056433B CN116056433B CN202310331189.1A CN202310331189A CN116056433B CN 116056433 B CN116056433 B CN 116056433B CN 202310331189 A CN202310331189 A CN 202310331189A CN 116056433 B CN116056433 B CN 116056433B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention relates to the technical field of vehicle-mounted chargers, and aims to solve the problems that in the existing heat dissipation mode of a vehicle-mounted charger measurement and control cabinet, the heat dissipation condition of the measurement and control cabinet cannot be clearly determined due to difficulty in analyzing the heat generation layer and the heat release layer of the measurement and control cabinet, and the heat dissipation state of the measurement and control cabinet cannot be timely regulated and controlled, so that the safe operation of the vehicle-mounted charger is jeopardized; according to the invention, the heat loss index and the ring temperature index of the vehicle-mounted battery charger measurement and control cabinet are defined, and the heat dissipation control operation of the measurement and control cabinet is realized through the control terminal, so that the regulation and control of the overheat state of the vehicle-mounted battery charger measurement and control cabinet are realized, and the optimal heat dissipation effect of the measurement and control cabinet is also realized.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted chargers, in particular to a heat dissipation method of an OBC measurement and control cabinet of a vehicle-mounted charger.
Background
The vehicle-mounted charger is fixedly arranged on the electric automobile and has the capability of safely and automatically fully charging the power battery of the electric automobile.
The measurement and control cabinet of the vehicle-mounted charger is equipment integrating the functions of electric control, instrument measurement, data acquisition and the like and is used for controlling and managing the operation of the vehicle-mounted charger so as to ensure the stability and safety of a charging process, so that the measurement and control cabinet of the vehicle-mounted charger is an important component part in a vehicle-mounted charging system.
Because a large number of electronic elements and circuits are integrated in the measurement and control cabinet of the vehicle-mounted battery charger, a large amount of heat is generated in the measurement and control cabinet, so that the stable operation of the measurement and control cabinet is influenced, and in the existing heat dissipation mode of the measurement and control cabinet of the vehicle-mounted battery charger, the heat dissipation operation is carried out on the measurement and control cabinet through a fixed heat dissipation device of the measurement and control cabinet, the heat generation layer and the heat release layer of the measurement and control cabinet are difficult to analyze, the heat dissipation condition of the measurement and control cabinet cannot be clearly determined, the heat dissipation state of the measurement and control cabinet cannot be timely regulated and controlled, and the safe operation of the vehicle-mounted battery charger is jeopardized.
In order to solve the above-mentioned defect, a technical scheme is provided.
Disclosure of Invention
The invention aims to solve the problems that in the existing heat dissipation mode of the measurement and control cabinet of the vehicle-mounted charger, the heat dissipation condition of the measurement and control cabinet cannot be definitely controlled and the heat dissipation state of the measurement and control cabinet cannot be timely regulated and controlled due to difficulty in analyzing the heat generation layer and the heat release layer of the measurement and control cabinet, and the safe operation of the vehicle-mounted charger is compromised, and the heat loss index and the ring temperature index of the measurement and control cabinet of the vehicle-mounted charger are definitely determined, and the heat dissipation control operation of the measurement and control cabinet is realized through a control terminal, so that the optimal heat dissipation effect of the measurement and control cabinet is realized while the overheat state regulation and control of the vehicle-mounted charger and the electric automobile are realized, and the safe operation of the vehicle-mounted charger and the electric automobile is ensured.
The aim of the invention can be achieved by the following technical scheme:
the heat dissipation method of the OBC measurement and control cabinet of the vehicle-mounted charger comprises a server, wherein the server is in communication connection with a data acquisition unit, a heat generation analysis unit, a heat release analysis unit, a thermal performance comprehensive analysis unit, a heat dissipation control analysis unit and a control terminal;
the data acquisition unit is used for acquiring heat generation parameter information and heat release parameter information of the vehicle-mounted battery charger measurement and control cabinet and respectively transmitting the heat generation parameter information and the heat release parameter information to the heat generation analysis unit and the heat release analysis unit through the server;
the heat generation analysis unit is used for receiving heat generation parameter information of the vehicle-mounted battery charger measurement and control cabinet, carrying out heat generation state evaluation analysis processing on the measurement and control cabinet, generating a high-heating-level signal, a medium-heating-level signal and a low-heating-level signal according to the heat generation parameter information, and sending the signals to the thermal performance comprehensive analysis unit through the server;
the heat release analysis unit is used for receiving heat release parameter information of the vehicle-mounted battery charger measurement and control cabinet, performing heat release state evaluation analysis processing on the measurement and control cabinet, generating a superior heat release feedback signal and a secondary heat release feedback signal according to the heat release parameter information, and sending the superior heat release feedback signal and the secondary heat release feedback signal to the thermal performance comprehensive analysis unit through the server;
the heat comprehensive analysis unit is used for receiving the heat generation type feedback signal and the heat release type feedback signal, carrying out heat generation and heat dissipation comprehensive analysis processing, generating a heat dissipation saturation signal and heat excessive instructions of each level according to the heat generation and heat dissipation comprehensive analysis processing, and sending the heat excessive instructions of each level to the heat dissipation control analysis unit;
the heat dissipation control analysis unit is used for receiving heat transition instructions of various grades, carrying out heat dissipation regulation and control analysis treatment on the measurement and control cabinet, generating a heat defect index and a ring temperature index of the vehicle-mounted battery charger measurement and control cabinet according to the heat defect index and the ring temperature index, and sending the heat defect index and the ring temperature index to the control terminal to carry out heat dissipation control operation of the vehicle-mounted battery charger measurement and control cabinet.
Further, the specific operation steps of the heat production state evaluation analysis processing of the measurement and control cabinet are as follows:
the power density value, the operation time, the heat output value and the heat influence value in the heat generation parameter information of the measurement and control cabinet of the vehicle-mounted charger are monitored in real time, and are respectively calibrated into pdv, rt, hpv and Bh, and are subjected to formulated analysis, and according to a set formulaObtaining a heat generation coefficient Phx of a measurement and control cabinet of the vehicle-mounted charger, wherein delta 1, delta 2, delta 3 and delta 4 are correction factor coefficients of a power density value, an operation duration, a heat generation value and a heat influence value respectively, and delta 1, delta 2, delta 3 and delta 4 are natural numbers larger than 0;
setting a first reference interval range 1, a second reference interval range 2 and a third reference interval range 3 of the heat generation coefficient of the vehicle-mounted battery measurement and control cabinet, substituting the heat generation coefficient of the vehicle-mounted battery measurement and control cabinet into the preset first reference interval range 1, second reference interval range 2 and third reference interval range 3 for comparison analysis;
when the heat generation coefficient of the measurement and control cabinet of the vehicle-mounted charger is within a preset first reference interval range 1, a low-heat-generation-level signal is generated, when the heat generation coefficient of the measurement and control cabinet of the vehicle-mounted charger is within a preset second reference interval range 2, a medium-heat-generation-level signal is generated, and when the heat generation coefficient of the measurement and control cabinet of the vehicle-mounted charger is within a preset third reference interval range 3, a high-heat-generation-level signal is generated.
Further, the specific operation steps of the heat release state evaluation analysis processing of the measurement and control cabinet are as follows:
the method comprises the steps of monitoring the heat dissipation device value, the distribution value and the heat dissipation capacity in the heat release parameter information of the vehicle-mounted battery charger measurement and control cabinet in real time, calibrating the heat dissipation device value, the distribution value and the heat dissipation capacity to dv, dm and dc respectively, carrying out formulated analysis on the heat dissipation device value, the distribution value and the heat dissipation capacity, and carrying out formulated analysis according to a set formulaObtaining a heat release coefficient trc of the measurement and control cabinet, wherein χ1, χ2 and χ3 are weight factor coefficients of a heat dissipation device value, a distribution value and a heat dissipation capacity respectively;
setting a release comparison threshold value1 of the heat release coefficient of the measurement and control cabinet, comparing and analyzing the heat release coefficient of the measurement and control cabinet with a preset release comparison threshold value1, generating a secondary heat release feedback signal when the heat release coefficient of the measurement and control cabinet is smaller than or equal to the preset release comparison threshold value1, and generating a superior heat release feedback signal when the heat release coefficient of the measurement and control cabinet is larger than the preset release comparison threshold value 1.
Further, the specific operation steps of the comprehensive analysis treatment of the heat generation and heat dissipation are as follows:
establishing a set W according to the heat generation type feedback signals, calibrating a high heating level signal as an element a1, calibrating a medium heating level signal as an element a2, calibrating a low heating level signal as an element a3, wherein the element a1 epsilon the set W, the element a2 epsilon the set W and the element a3 epsilon the set W;
establishing a set V according to the heat release type feedback signals, calibrating the superior heat release feedback signals as elements b1, calibrating the secondary heat release feedback signals as elements b2, wherein the elements b1 epsilon the set V, and the elements b2 epsilon the set V;
the method comprises the steps of performing union processing on a set W and V, generating a first-level heat transition instruction if W U V= { a1, b2}, generating a second-level heat transition instruction if W U V= { a2, b2}, and generating a third-level heat transition instruction if W U V= { a3, b2 };
when W u v= { a3, b1} or { a2, b1} or { a1, b1} is set, heat dissipation saturation signals are generated.
Further, the specific operation steps of the heat dissipation regulation analysis treatment of the measurement and control cabinet are as follows:
s1: performing assignment calibration on each grade of thermal transition instruction, and marking asWherein->Assignment score representing i-th grade thermal transition instruction, and i=1, 2,3, and when i=1,/is ∈>Expressed as assigned score under first order thermal override instruction, when i=2 =f->Expressed as assigned score under the second order thermal transition instruction, when i=3, +.>Expressed as a score of assignment under three-level thermal overinstruction, and +.>＜/>＜/>；
S2: the method comprises the steps of monitoring an internal environment temperature value of a vehicle-mounted battery charger measurement and control cabinet and an external environment temperature value of an environment where the measurement and control cabinet is located in real time, calibrating the internal environment temperature value and the external environment temperature value into ntd and wtd respectively, performing differential analysis on the ntd and wtd to wcz =ntd-wtd to obtain a temperature difference value wcz of the vehicle-mounted battery charger measurement and control cabinet, and judging the positive and negative states of the temperature difference value;
s3: when the temperature difference value wcz is less than or equal to 0, namely the internal environment temperature value of the vehicle-mounted battery measurement and control cabinet is less than or equal to the external environment temperature value, generating a heat dissipation function missing signal, and judging, analyzing and processing the heat dissipation function missing state according to the heat dissipation function missing signal to obtain the assignment of the heat dissipation function missing item of the vehicle-mounted battery measurement and control cabinetValue fraction ρ j* Where j=1, 2,3, ρ when j=1 1 The assigned score of the thermal function missing item expressed as measurement and control cabinet is Q1 score, when j=2, ρ 2 The assigned score of the thermal function missing item expressed as measurement and control cabinet is Q2 score, when j=3, ρ 3 The assigned score of the heat function missing item expressed as the measurement and control cabinet is Q3;
s4: assigning a score to the thermal transition grade of the measurement and control cabinet of the vehicle-mounted chargerAssignment score ρ to heat dissipation function missing term j* Performing comprehensive analysis according to the set formula +.>Obtaining the heat defect index omega of the vehicle-mounted battery charger measurement and control cabinet 1 i*j* Wherein, gamma 1 is a constant, each heat defect index corresponds to a heat dissipation device magnitude extension section, and a heat dissipation device of corresponding magnitude is additionally arranged in a measurement and control cabinet of the vehicle-mounted charger through a control terminal according to the heat dissipation device magnitude extension section;
s5: when the temperature difference value wcz is more than 0, namely the internal environment temperature value of the vehicle-mounted battery charger measurement and control cabinet is larger than the external environment temperature value, generating an environment temperature rise signal, and accordingly judging, analyzing and processing the environment temperature rise state to obtain the assignment score eta of the environment temperature rise item of the vehicle-mounted battery charger measurement and control cabinet k* Where k=1, 2,3, η when k=1 1 The assigned score of the thermal-function-missing level expressed as a measurement and control cabinet is P1 score, η when k=2 2 The assigned score of the thermal-function-missing level expressed as a measurement and control cabinet is P2 score, η when k=3 3 The assigned score of the heat function missing level expressed as the measurement and control cabinet is P3;
s6: assigning a score to the thermal transition grade of the measurement and control cabinet of the vehicle-mounted chargerAssignment score η to ambient temperature rise term k* Performing comprehensive analysis according to the set formula +.>Obtaining the ring temperature index omega of the vehicle-mounted charger measurement and control cabinet 2 i*k* And each ring temperature index corresponds to an external temperature low Wen Liangji degradation interval, and the temperature of the external environment of the measurement and control cabinet of the vehicle-mounted charger is cooled by a corresponding order of magnitude through the control terminal according to the external temperature low Wen Liangji degradation interval.
Further, the specific operation steps of the heat dissipation function missing state judgment, analysis and processing are as follows:
setting a first thermal function missing interval block1, a second thermal function missing interval block2 and a third thermal function missing interval block3 of temperature difference values, and substituting the temperature difference values into preset various thermal function missing intervals for comparison analysis;
when the temperature difference value of the vehicle-mounted battery measurement and control cabinet is within a preset first thermal function missing interval block1, the thermal function missing level of the vehicle-mounted battery measurement and control cabinet is assigned as Q1 score, when the temperature difference value of the vehicle-mounted battery measurement and control cabinet is within a preset second thermal function missing interval block2, the thermal function missing level of the vehicle-mounted battery measurement and control cabinet is assigned as Q2 score, and when the temperature difference value of the vehicle-mounted battery measurement and control cabinet is within a preset third thermal function missing interval block3, the thermal function missing level of the vehicle-mounted battery measurement and control cabinet is assigned as Q3 score, and Q1 is smaller than Q2 and smaller than Q3.
Further, the specific operation steps of the environmental temperature rise state judgment, analysis and treatment are as follows:
setting a first environmental temperature rise interval sts1, a second environmental temperature rise interval sts2 and a third environmental temperature rise interval sts3 of temperature difference values, substituting the temperature difference values into preset environmental temperature rise intervals of various types, and comparing and analyzing;
when the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet is within a preset first environment temperature rise interval sts1, the environment Wen Shengxiang of the vehicle-mounted battery charger measurement and control cabinet is assigned to be P1, when the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet is within a preset second environment temperature rise interval sts2, the environment Wen Shengxiang of the vehicle-mounted battery charger measurement and control cabinet is assigned to be P2, and when the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet is within a preset third environment temperature rise interval sts3, the environment Wen Shengxiang of the vehicle-mounted battery charger measurement and control cabinet is assigned to be P3.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the heat generation degree of the vehicle-mounted battery charger measurement and control cabinet is clearly analyzed by utilizing a mode of normalized analysis, gradient setting of a reference interval and numerical substitution comparison analysis item by item; the method realizes the definite judgment and analysis of the heat radiation performance of the vehicle-mounted battery charger measurement and control cabinet by using the modes of formula calculation, comparison threshold setting and data comparison analysis;
the judgment feedback of the comprehensive heat dissipation state of the vehicle-mounted battery charger measurement and control cabinet is defined by adopting the modes of symbol calibration, set regulation and union operation analysis, and a foundation is laid for realizing the accurate regulation and control of heat dissipation of the measurement and control cabinet;
according to the positive and negative states of the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet, the heat dissipation function deficiency degree of the measurement and control cabinet or the heat dissipation abnormality degree of the measurement and control cabinet caused by larger temperature rise of the external environment are defined, and the heat defect index and the ring temperature index of the vehicle-mounted battery charger measurement and control cabinet are defined by adopting the modes of grade quantitative analysis, fraction assignment and data comprehensive analysis, and a heat dissipation device of corresponding orders of magnitude is additionally arranged in the measurement and control cabinet of the vehicle-mounted battery charger through a control terminal according to the heat defect index so as to achieve the optimal heat dissipation effect of the measurement and control cabinet; the temperature of the external environment of the measurement and control cabinet of the vehicle-mounted charger is reduced by a corresponding order of magnitude through the control terminal according to the ring temperature index, so that the safety operation of the vehicle-mounted charger is ensured while the regulation and control of the overheat state of the measurement and control cabinet of the vehicle-mounted charger is effectively realized, and the operation safety of the electric automobile is further ensured.
Drawings
For the convenience of those skilled in the art, the present invention will be further described with reference to the accompanying drawings;
FIG. 1 is a general block diagram of a system of the present invention;
fig. 2 is a flow chart of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and fig. 2, the heat dissipation method of the on-board battery charger OBC measurement and control cabinet comprises a server, wherein the server is in communication connection with a data acquisition unit, a heat generation analysis unit, a heat release analysis unit, a thermal performance comprehensive analysis unit, a heat dissipation control analysis unit and a control terminal;
the data acquisition unit acquires heat generation parameter information and heat release parameter information of the vehicle-mounted battery charger measurement and control cabinet and sends the heat generation parameter information and the heat release parameter information to the heat generation analysis unit and the heat release analysis unit respectively through the server.
When the heat generation analysis unit receives heat generation parameter information of the vehicle-mounted battery charger measurement and control cabinet, the measurement and control cabinet is subjected to heat generation state evaluation analysis processing, and the specific operation process is as follows:
the power density value, the operation time, the heat output value and the heat influence value in the heat generation parameter information of the measurement and control cabinet of the vehicle-mounted charger are monitored in real time, and are respectively calibrated into pdv, rt, hpv and Bh, and are subjected to formulated analysis, and according to a set formulaThe heat generation coefficient Phx of the measurement and control cabinet of the vehicle-mounted charger is obtained, sl represents the quantity, namely the quantity of electronic components and circuits, wherein delta 1, delta 2, delta 3 and delta 4 are correction factor coefficients of a power density value, an operation duration, a device heat generation value and a heat influence value respectively, delta 1, delta 2, delta 3 and delta 4 are natural numbers larger than 0, and the correction factor coefficients are used for correcting deviation of various parameters in the formula calculation process, so that more accurate parameter data are calculated;
it should be noted that, the power density value refers to the power density of the vehicle-mounted charger, when the expression numerical value of the power density value is larger, the larger the heat generated by the vehicle-mounted charger during operation is, the larger the heat generated by the measurement and control cabinet is, the operation duration refers to the data value of the working time of the measurement and control cabinet, when the working time of the measurement and control cabinet is longer, the larger the working operation load of the measurement and control cabinet is, the larger the heat generated by the measurement and control cabinet is, and the heat generation value of the device refers to the heat value generated by each electronic component arranged in the measurement and control cabinet and each circuit in unit time;
it should also be noted that the specific solving process of the thermal influence value is as follows:
the method comprises the steps of monitoring a duty ratio value and an instrumental value of a vehicle-mounted battery measurement and control cabinet in real time, calibrating the duty ratio value and the instrumental value as ev and am respectively, carrying out normalization analysis on the duty ratio value and the instrumental value, and obtaining a thermal influence value Bh of the vehicle-mounted battery measurement and control cabinet according to a set formula Bh=λ1×ev+λ2×sl, wherein λ1 and λ2 are weight factor coefficients of the duty ratio value and the instrumental value respectively, and the weight factor coefficients are used for balancing duty ratio weights of various data in formula calculation, so that accuracy of calculation results is promoted;
the space occupation value refers to a data value of the ratio of the usage space of the measurement and control cabinet of the vehicle-mounted charger to the bare space of the measurement and control cabinet, and when the expression value of the space occupation value is larger, the limitation degree of heat dissipation of the measurement and control cabinet of the vehicle-mounted charger is larger; the device value refers to the number value of electronic components and circuits integrated in the measurement and control cabinet of the vehicle-mounted charger, and when the performance value of the device value is larger, the more the number of the electronic components and the circuits integrated in the measurement and control cabinet is, the more the heat dissipation burden of the measurement and control cabinet is further increased;
setting a first reference interval range 1, a second reference interval range 2 and a third reference interval range 3 of the heat generation coefficient of the vehicle-mounted battery measurement and control cabinet, substituting the heat generation coefficient of the vehicle-mounted battery measurement and control cabinet into the preset first reference interval range 1, second reference interval range 2 and third reference interval range 3 for comparison analysis;
when the heat generation coefficient of the measurement and control cabinet of the vehicle-mounted charger is within a preset first reference interval range 1, a low-heat-generation-level signal is generated, when the heat generation coefficient of the measurement and control cabinet of the vehicle-mounted charger is within a preset second reference interval range 2, a medium-heat-generation-level signal is generated, and when the heat generation coefficient of the measurement and control cabinet of the vehicle-mounted charger is within a preset third reference interval range 3, a high-heat-generation-level signal is generated;
and the generated high-heating-level signal, medium-heating-level signal and low-heating-level signal are sent to the thermal performance comprehensive analysis unit through the server.
When the heat release analysis unit receives the heat release parameter information of the vehicle-mounted battery charger measurement and control cabinet, the measurement and control cabinet is subjected to heat release state evaluation analysis treatment, and the specific operation process is as follows:
the method comprises the steps of monitoring the heat dissipation device value, the distribution value and the heat dissipation capacity in the heat release parameter information of the vehicle-mounted battery charger measurement and control cabinet in real time, calibrating the heat dissipation device value, the distribution value and the heat dissipation capacity to dv, dm and dc respectively, carrying out formulated analysis on the heat dissipation device value, the distribution value and the heat dissipation capacity, and carrying out formulated analysis according to a set formulaObtaining a heat release coefficient trc of the measurement and control cabinet, wherein χ1, χ2 and χ3 are weight factor coefficients of a heat dissipating device value, a cloth mean value and a heat dissipating capacity respectively, and specific numerical values of χ1, χ2 and χ3 are set specifically in specific cases by a person skilled in the art;
the heat dissipation device value refers to the number value of the heat dissipation devices arranged in the measurement and control cabinet, the distribution value refers to the uniformity value of the distribution of the heat dissipation devices arranged in the measurement and control cabinet, and the heat dissipation capacity refers to the data value of the heat released to the outside in unit time of each heat dissipation device;
setting a release comparison threshold value1 of the heat release coefficient of the measurement and control cabinet, comparing and analyzing the heat release coefficient of the measurement and control cabinet with a preset release comparison threshold value1, generating a secondary heat release feedback signal when the heat release coefficient of the measurement and control cabinet is smaller than or equal to the preset release comparison threshold value1, and generating a superior heat release feedback signal when the heat release coefficient of the measurement and control cabinet is larger than the preset release comparison threshold value 1;
and sending the generated superior heat release feedback signal and the generated secondary heat release feedback signal to the thermal performance comprehensive analysis unit through the server.
When the heat comprehensive analysis unit receives the heat generation type feedback signal and the heat release type feedback signal, and accordingly, heat generation and heat dissipation comprehensive analysis processing is performed, wherein the heat generation type feedback signal comprises a high-heating-level signal, a medium-heating-level signal and a low-heating-level signal, the heat release type feedback signal comprises a high-level heat release feedback signal and a secondary heat release feedback signal, and the specific operation process is as follows:
establishing a set W according to the heat generation type feedback signals, calibrating a high heating level signal as an element a1, calibrating a medium heating level signal as an element a2, calibrating a low heating level signal as an element a3, wherein the element a1 epsilon the set W, the element a2 epsilon the set W and the element a3 epsilon the set W;
establishing a set V according to the heat release type feedback signals, calibrating the superior heat release feedback signals as elements b1, calibrating the secondary heat release feedback signals as elements b2, wherein the elements b1 epsilon the set V, and the elements b2 epsilon the set V;
the method comprises the steps of performing union processing on a set W and V, generating a first-level heat transition instruction if W U V= { a1, b2}, generating a second-level heat transition instruction if W U V= { a2, b2}, and generating a third-level heat transition instruction if W U V= { a3, b2 };
if W u v= { a3, b1} or { a2, b1} or { a1, b1} then all generate heat dissipation saturation signals;
the generated heat transition instructions of all levels are sent to a heat dissipation control analysis unit;
when the heat dissipation control analysis unit receives heat transition instructions of various grades, heat dissipation regulation analysis processing is carried out on the measurement and control cabinet, and the specific operation process is as follows:
performing assignment calibration on each grade of thermal transition instruction, and marking asWherein->Assignment score representing i-th grade thermal transition instruction, and i=1, 2,3, and when i=1,/is ∈>Expressed as assigned score under first order thermal override instruction, when i=2 =f->Expressed as assigned score under the second order thermal transition instruction, when i=3, +.>Expressed as a score of assignment under three-level thermal overinstruction, and +.>＜/>＜/>；
The method comprises the steps of monitoring an internal environment temperature value of a vehicle-mounted battery charger measurement and control cabinet and an external environment temperature value of an environment where the measurement and control cabinet is located in real time, calibrating the internal environment temperature value and the external environment temperature value into ntd and wtd respectively, performing differential analysis on the ntd and wtd to wcz =ntd-wtd to obtain a temperature difference value wcz of the vehicle-mounted battery charger measurement and control cabinet, and judging the positive and negative states of the temperature difference value;
when the temperature difference value wcz is less than or equal to 0, namely the internal environment temperature value of the vehicle-mounted battery charger measurement and control cabinet is less than or equal to the external environment temperature value, a heat dissipation function missing signal is generated, and the heat dissipation function missing state judgment, analysis and treatment are carried out according to the heat dissipation function missing signal, and the method is specific:
setting a first thermal function missing interval block1, a second thermal function missing interval block2 and a third thermal function missing interval block3 of temperature difference values, and substituting the temperature difference values into preset various thermal function missing intervals for comparison analysis;
when the temperature difference value of the vehicle-mounted battery measurement and control cabinet is within a preset first thermal function missing interval block1, assigning a thermal function missing level of the vehicle-mounted battery measurement and control cabinet to be Q1 score, when the temperature difference value of the vehicle-mounted battery measurement and control cabinet is within a preset second thermal function missing interval block2, assigning a thermal function missing level of the vehicle-mounted battery measurement and control cabinet to be Q2 score, and when the temperature difference value of the vehicle-mounted battery measurement and control cabinet is within a preset third thermal function missing interval block3, assigning a thermal function missing level of the vehicle-mounted battery measurement and control cabinet to be Q3 score, wherein Q1 is less than Q2 and less than Q3, and setting specific numerical values of Q1, Q2 and Q3 are specifically set by a person skilled in the art in specific cases;
it should be noted that, the interval value of the first thermal-function-missing interval block1 is smaller than the interval value of the second thermal-function-missing interval block2, and the interval value of the second thermal-function-missing interval block is smaller than the interval value of the third thermal-function-missing interval block 3;
carrying out symbol calibration on assigned scores of heat dissipation function missing items of the vehicle-mounted battery charger measurement and control cabinet, and marking as rho j* Where j=1, 2,3, ρ when j=1 1 The assigned score of the thermal function missing item expressed as measurement and control cabinet is Q1 score, when j=2, ρ 2 The assigned score of the thermal function missing item expressed as measurement and control cabinet is Q2 score, when j=3, ρ 3 The assigned score of the heat function missing item expressed as the measurement and control cabinet is Q3;
assigning a score to the thermal transition grade of the measurement and control cabinet of the vehicle-mounted chargerAssignment score ρ to heat dissipation function missing term j* Performing comprehensive analysis according to the set formula +.>Obtaining the heat defect index omega of the vehicle-mounted battery charger measurement and control cabinet 1 i*j* Wherein, gamma 1 is a constant, each heat defect index corresponds to a heat dissipation device magnitude extension section, and a heat dissipation device of corresponding magnitude is additionally arranged in a measurement and control cabinet of the vehicle-mounted charger through a control terminal according to the heat dissipation device magnitude extension section.
In the heat dissipation process of the vehicle-mounted battery charger measurement and control cabinet, as the temperature is different, the higher temperature flows to the lower temperature, so that the low-temperature environment is very important for the heat dissipation of the vehicle-mounted battery charger measurement and control cabinet;
when the temperature difference value wcz is more than 0, namely the internal environment temperature value of the vehicle-mounted charger measurement and control cabinet is larger than the external environment temperature value, an environment temperature rise signal is generated, and the environment temperature rise state judgment, analysis and treatment are carried out according to the environment temperature rise signal, specifically:
setting a first environmental temperature rise interval sts1, a second environmental temperature rise interval sts2 and a third environmental temperature rise interval sts3 of temperature difference values, substituting the temperature difference values into preset environmental temperature rise intervals of various types, and comparing and analyzing;
when the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet is within a preset first environment temperature rise interval sts1, the environment Wen Shengxiang of the vehicle-mounted battery charger measurement and control cabinet is assigned to be P1 score, when the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet is within a preset second environment temperature rise interval sts2, the environment Wen Shengxiang of the vehicle-mounted battery charger measurement and control cabinet is assigned to be P2 score, and when the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet is within a preset third environment temperature rise interval sts3, the environment Wen Shengxiang of the vehicle-mounted battery charger measurement and control cabinet is assigned to be P3 score, wherein P1 is smaller than P2 and P3, and the specific numerical values of P1, P2 and P3 are set specifically in specific cases by a person skilled in the art;
the assigned fraction of the environmental temperature rise of the vehicle-mounted battery charger measurement and control cabinet is marked and marked as eta k* Where k=1, 2,3, η when k=1 1 The assigned score of the thermal-function-missing level expressed as a measurement and control cabinet is P1 score, η when k=2 2 The assigned score of the thermal-function-missing level expressed as a measurement and control cabinet is P2 score, η when k=3 3 The assigned score of the heat function missing level expressed as the measurement and control cabinet is P3;
assigning a score to the thermal transition grade of the measurement and control cabinet of the vehicle-mounted chargerAssignment score η to ambient temperature rise term k* Performing comprehensive analysis according to the set formula +.>Obtaining the ring temperature index omega of the vehicle-mounted charger measurement and control cabinet 2 i*k* Wherein, gamma 2 is a constant, each ring temperature is of the index pairAnd an external temperature low Wen Liangji degradation interval is adopted, and the temperature of the external environment of the measurement and control cabinet of the vehicle-mounted charger is cooled by a corresponding order of magnitude through the control terminal according to the external temperature low Wen Liangji degradation interval.
When the system is used, the heat generation parameter information of the vehicle-mounted battery charger measurement and control cabinet is acquired and is subjected to heat generation state evaluation analysis treatment, and the heat generation degree of the vehicle-mounted battery charger measurement and control cabinet is clearly analyzed by utilizing a mode of normalized analysis, gradient setting of a reference interval and numerical substitution comparison analysis item by item;
the heat release parameter information of the vehicle-mounted battery charger measurement and control cabinet is captured, and the heat release state evaluation analysis processing is carried out, so that the definite judgment and analysis of the heat radiation performance of the vehicle-mounted battery charger measurement and control cabinet are realized by using the modes of formula calculation, comparison threshold setting and data comparison analysis;
the heat generation type feedback signal and the heat release type feedback signal of the vehicle-mounted battery measurement and control cabinet are comprehensively analyzed by adopting the modes of symbol calibration, set regulation and union operation analysis, and the judgment feedback of the comprehensive heat dissipation state of the vehicle-mounted battery measurement and control cabinet is defined, so that a foundation is laid for realizing the accurate regulation and control of heat dissipation of the measurement and control cabinet;
according to the positive and negative states of the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet, the heat dissipation function deficiency degree of the measurement and control cabinet or the heat dissipation abnormality degree of the measurement and control cabinet caused by larger temperature rise of the external environment are defined, the heat defect index of the vehicle-mounted battery charger measurement and control cabinet is defined by adopting the modes of grade quantitative analysis, fraction assignment and data comprehensive analysis, and a heat dissipation device of corresponding order of magnitude is additionally arranged in the measurement and control cabinet of the vehicle-mounted battery charger through a control terminal according to the heat defect index so as to achieve the optimal heat dissipation effect of the measurement and control cabinet;
the ring temperature index of the vehicle-mounted battery charger measurement and control cabinet is also defined, and the temperature of the external environment of the vehicle-mounted battery charger measurement and control cabinet is cooled by a corresponding order of magnitude according to the ring temperature index through the control terminal, so that the safety operation of the vehicle-mounted battery charger is ensured while the regulation and control of the overheat state of the vehicle-mounted battery charger measurement and control cabinet is effectively realized, and the operation safety of an electric automobile is further ensured.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (6)
1. An OBC measurement and control cabinet heat dissipation method of an on-board charger comprises the following steps:
step one: acquiring heat generation parameter information and heat release parameter information of a vehicle-mounted battery charger measurement and control cabinet;
characterized by further comprising:
step two: carrying out heat output state evaluation analysis processing on the received heat generation parameter information of the vehicle-mounted charger measurement and control cabinet, and generating a heat generation type feedback signal according to the heat output state evaluation analysis processing; wherein the heat generation type feedback signal includes a high heat generation level signal, a medium heat generation level signal, and a low heat generation level signal;
step three: performing heat release state evaluation analysis processing on the received heat release parameter information of the vehicle-mounted charger measurement and control cabinet, and generating a heat release type feedback signal according to the heat release state evaluation analysis processing; wherein the heat release type feedback signal comprises a superior heat release feedback signal and a secondary heat release feedback signal;
step four: carrying out heat generation and heat dissipation comprehensive analysis processing on the heat generation type feedback signal and the heat release type feedback signal, thereby generating a heat dissipation saturation signal, a primary heat excessive instruction, a secondary heat excessive instruction and a tertiary heat excessive instruction;
step five: carrying out heat dissipation regulation analysis processing on the received heat transition instructions of each level in the measurement and control cabinet, generating a heat defect index and a ring temperature index of the vehicle-mounted battery charger measurement and control cabinet according to the heat defect index and the ring temperature index, and sending the heat defect index and the ring temperature index to the control terminal for carrying out heat dissipation control operation of the vehicle-mounted battery charger measurement and control cabinet; the specific operation steps of the heat dissipation regulation analysis treatment of the measurement and control cabinet are as follows:
s1: performing assignment calibration on each grade of thermal transition instruction, and marking asWherein->A score representing a grade i thermal transition instruction;
s2: the method comprises the steps of monitoring an internal environment temperature value of a vehicle-mounted battery charger measurement and control cabinet and an external environment temperature value of an environment where the measurement and control cabinet is located in real time, performing differential analysis on the internal environment temperature value and the external environment temperature value to obtain a temperature difference value of the vehicle-mounted battery charger measurement and control cabinet, and judging the positive and negative states of the temperature difference value;
s3: when the temperature difference value is less than or equal to 0, generating a heat dissipation function missing signal, and judging, analyzing and processing the heat dissipation function missing state according to the heat dissipation function missing signal to obtain the assignment score of the heat dissipation function missing item of the vehicle-mounted battery charger measurement and control cabinet；
S4: assigning a score to the thermal transition grade of the measurement and control cabinet of the vehicle-mounted chargerAssignment score to Heat dissipation function Ends->Performing comprehensive analysis according to the set formula +.>Obtaining the heat defect index omega of the vehicle-mounted battery charger measurement and control cabinet 1 i*j* Wherein, gamma 1 is a constant, each heat defect index corresponds to a heat dissipation device magnitude extension section, and a heat dissipation device of corresponding magnitude is additionally arranged in a measurement and control cabinet of the vehicle-mounted charger through a control terminal according to the heat dissipation device magnitude extension section;
s5: when the temperature difference value is larger than 0, the environment Wen Shengxin is generatedThe number is equal, and the environmental temperature rise state judgment, analysis and treatment are carried out according to the number, so as to obtain the assignment score eta of the environmental temperature rise item of the vehicle-mounted charger measurement and control cabinet k* ；
S6: assigning a score phi to the thermal transition grade of a measurement and control cabinet of the vehicle-mounted charger i* Assignment score η to ambient temperature rise term k* Performing comprehensive analysis according to the set formulaObtaining the ring temperature index omega of the vehicle-mounted charger measurement and control cabinet 2 i*k* Wherein, gamma 2 is the constant, and every ring temperature index corresponds an outside temperature low Wen Liangji degradation interval to according to outside temperature low temperature order degradation interval, carry out the cooling operation of corresponding order of magnitude to the temperature of the external environment of the measurement and control cabinet of vehicle-mounted battery charger through control terminal.
2. The heat dissipation method of the OBC measurement and control cabinet of the vehicle-mounted charger according to claim 1, wherein the specific operation steps of the heat production state evaluation analysis processing of the measurement and control cabinet are as follows:
the power density value, the operation time, the heat output value and the heat influence value in the heat generation parameter information of the measurement and control cabinet of the vehicle-mounted charger are monitored in real time, and are subjected to formulated analysis to obtain the heat output coefficient of the measurement and control cabinet of the vehicle-mounted charger;
setting a first reference interval, a second reference interval and a third reference interval of the heat generation coefficient of the vehicle-mounted battery measurement and control cabinet, substituting the heat generation coefficient of the vehicle-mounted battery measurement and control cabinet into the preset first reference interval, second reference interval and third reference interval for comparison analysis;
when the heat generation coefficient of the measurement and control cabinet of the vehicle-mounted charger is within a preset first reference interval, a low-heating-level signal is generated; when the heat generation coefficient of the measurement and control cabinet of the vehicle-mounted charger is within a preset second reference interval, a medium heating grade signal is generated; and when the heat generation coefficient of the measurement and control cabinet of the vehicle-mounted charger is within a preset third reference interval, generating a high heat generation level signal.
3. The heat dissipation method of the OBC measurement and control cabinet of the vehicle-mounted charger according to claim 1, wherein the specific operation steps of the heat release state evaluation analysis processing of the measurement and control cabinet are as follows:
the method comprises the steps of monitoring a heat dissipation device value, a distribution value and a heat dissipation capacity in heat release parameter information of a vehicle-mounted battery charger measurement and control cabinet in real time, and carrying out formulated analysis on the heat dissipation device value, the distribution value and the heat dissipation capacity to obtain a heat release coefficient of the measurement and control cabinet;
setting a release comparison threshold value1 of the heat release coefficient of the measurement and control cabinet, comparing and analyzing the heat release coefficient of the measurement and control cabinet with a preset release comparison threshold value1, generating a secondary heat release feedback signal when the heat release coefficient of the measurement and control cabinet is smaller than or equal to the preset release comparison threshold value1, and generating a superior heat release feedback signal when the heat release coefficient of the measurement and control cabinet is larger than the preset release comparison threshold value 1.
4. The heat dissipation method of the OBC measurement and control cabinet of the vehicle-mounted charger according to claim 1, wherein the specific operation steps of the comprehensive analysis and treatment of the heat generation and heat dissipation are as follows:
establishing a set W according to the heat generation type feedback signals, calibrating a high heating level signal as an element a1, calibrating a medium heating level signal as an element a2, calibrating a low heating level signal as an element a3, wherein the element a1 epsilon the set W, the element a2 epsilon the set W and the element a3 epsilon the set W;
establishing a set V according to the heat release type feedback signals, calibrating the superior heat release feedback signals as elements b1, calibrating the secondary heat release feedback signals as elements b2, wherein the elements b1 epsilon the set V, and the elements b2 epsilon the set V;
the method comprises the steps of performing union processing on a set W and V, generating a first-level heat transition instruction if W U V= { a1, b2}, generating a second-level heat transition instruction if W U V= { a2, b2}, and generating a third-level heat transition instruction if W U V= { a3, b2 };
when W u v= { a3, b1} or { a2, b1} or { a1, b1} is set, heat dissipation saturation signals are generated.
5. The heat dissipation method of the OBC measurement and control cabinet of the vehicle-mounted charger according to claim 1, wherein the specific operation steps of judging, analyzing and processing the heat dissipation function missing state are as follows:
setting a first thermal function missing interval block1, a second thermal function missing interval block2 and a third thermal function missing interval block3 of temperature difference values, and substituting the temperature difference values into preset various thermal function missing intervals for comparison analysis;
when the temperature difference value of the vehicle-mounted battery measurement and control cabinet is within a preset first thermal function missing interval block1, the thermal function missing level of the vehicle-mounted battery measurement and control cabinet is assigned as Q1, when the temperature difference value of the vehicle-mounted battery measurement and control cabinet is within a preset second thermal function missing interval block2, the thermal function missing level of the vehicle-mounted battery measurement and control cabinet is assigned as Q2, and when the temperature difference value of the vehicle-mounted battery measurement and control cabinet is within a preset third thermal function missing interval block3, the thermal function missing level of the vehicle-mounted battery measurement and control cabinet is assigned as Q3.
6. The heat dissipation method of the OBC measurement and control cabinet of the vehicle-mounted charger according to claim 5, wherein the specific operation steps of the environmental temperature rise state judgment, analysis and treatment are as follows:
setting a first environmental temperature rise interval sts1, a second environmental temperature rise interval sts2 and a third environmental temperature rise interval sts3 of temperature difference values, substituting the temperature difference values into preset environmental temperature rise intervals of various types, and comparing and analyzing;
when the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet is within a preset first environment temperature rise interval sts1, the environment Wen Shengxiang of the vehicle-mounted battery charger measurement and control cabinet is assigned to be P1, when the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet is within a preset second environment temperature rise interval sts2, the environment Wen Shengxiang of the vehicle-mounted battery charger measurement and control cabinet is assigned to be P2, and when the temperature difference value of the vehicle-mounted battery charger measurement and control cabinet is within a preset third environment temperature rise interval sts3, the environment Wen Shengxiang of the vehicle-mounted battery charger measurement and control cabinet is assigned to be P3.
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| US6203191B1 (en) * | 1998-10-28 | 2001-03-20 | Speculative Incorporated | Method of junction temperature determination and control utilizing heat flow |
| CN108469111A (en) * | 2018-04-02 | 2018-08-31 | 中首能能源投资（北京）有限公司 | A kind of control method of residual neat recovering system and residual neat recovering system based on data center |
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