CN113733915B - High-voltage loop hot spot protection method and related equipment - Google Patents
High-voltage loop hot spot protection method and related equipment Download PDFInfo
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- CN113733915B CN113733915B CN202111045291.2A CN202111045291A CN113733915B CN 113733915 B CN113733915 B CN 113733915B CN 202111045291 A CN202111045291 A CN 202111045291A CN 113733915 B CN113733915 B CN 113733915B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 90
- 238000010438 heat treatment Methods 0.000 claims description 27
- 230000008859 change Effects 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 description 13
- 239000000306 component Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008054 signal transmission Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000013021 overheating Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000008358 core component Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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Abstract
The application discloses a high-voltage loop hot spot protection method and related equipment, relates to the technical field of circuit protection, and can timely monitor and early warn hot spots of a high-voltage loop of a vehicle so as to improve the safety protection performance of the vehicle. The high-voltage loop hot spot protection method comprises the following steps: setting a voltage difference threshold of a high-voltage loop of the vehicle; testing the voltage of the test point positions on the high-voltage loop to obtain the actual voltage difference of any two test point positions; judging whether the high-voltage loop has a hot spot hidden trouble or not according to the actual voltage difference and the voltage difference threshold; and if the high-voltage loop has a hot spot hidden trouble, sending out hot spot early warning.
Description
Technical Field
The application relates to the technical field of circuit protection, in particular to a high-voltage loop hot spot protection method and related equipment.
Background
The high-voltage system is a core component of the electric automobile, the high-voltage loop plays a key role in energy transmission and signal transmission in the high-voltage system, and the performance of the high-voltage component can be influenced by overheating of the high-voltage loop, and even the safety of people and automobiles is threatened. In the existing electric automobile, in order to improve the safety of the high-voltage loop, the cable diameter is generally increased within a reasonable range so as to improve the capacity of carrying large current of the cable and avoid overheating of the high-voltage loop. And abnormal heating caused by poor contact at the cable connection part is avoided by reinforcing the cable connection part.
However, the existing arrangement of the high-voltage loop is only improved on the cable layer, so that the monitoring and early warning of the hot spot of the high-voltage loop are difficult to realize, and the safety protection performance of the vehicle is poor.
Disclosure of Invention
The embodiment of the application provides a high-voltage loop hot spot protection method and related equipment, which can timely monitor and early warn hot spots of a high-voltage loop of a vehicle so as to improve the safety protection performance of the vehicle.
In a first aspect of an embodiment of the present application, a high-voltage loop hotspot protection method is provided, including:
setting a voltage difference threshold of a high-voltage loop of the vehicle;
testing the voltage of the test point positions on the high-voltage loop to obtain the actual voltage difference of any two test point positions;
judging whether the high-voltage loop has a hot spot hidden trouble or not according to the actual voltage difference and the voltage difference threshold;
and if the high-voltage loop has a hot spot hidden trouble, sending out hot spot early warning.
In some embodiments, the setting the voltage difference threshold of the high voltage loop of the vehicle includes:
testing the maximum voltage difference of any two test points of the high-voltage loop in normal operation;
setting the voltage difference threshold of the high-voltage loop of the vehicle according to the maximum voltage difference and a voltage test error;
the voltage difference threshold is calibrated.
In some embodiments, said calibrating said voltage difference threshold comprises:
testing the resistance value of the high-voltage loop;
calculating to obtain the maximum theoretical voltage difference of the high-voltage loop according to the resistance value and the maximum current value allowed by the high-voltage loop;
and calibrating the voltage difference threshold according to the maximum theoretical voltage difference.
In some embodiments, the calibrating the voltage difference threshold further comprises:
and calibrating the voltage difference threshold according to the maximum safe temperature of the high-voltage loop based on the relation between the voltage difference and the temperature change.
In some embodiments, if the high-voltage loop has a hot spot hidden trouble, based on a relationship between a voltage difference and a temperature change, a hot spot duration threshold is obtained according to the actual voltage difference and a maximum safe temperature of the high-voltage loop.
In some embodiments, if the high-voltage circuit has a hot spot hidden trouble, sending out a hot spot early warning, including:
and if the high-voltage loop has a hot spot hidden trouble, sending out the hot spot early warning, and adjusting the voltage of the high-voltage loop corresponding to the hot spot hidden trouble, wherein the hot spot early warning comprises the hot spot duration threshold.
In some embodiments, the high voltage circuit includes a motor system high voltage circuit, a charging voltage high voltage circuit, a cooling high voltage circuit, and a heating high voltage circuit.
In a second aspect of the embodiments of the present application, a high-voltage loop hot spot protection device is provided, including:
the threshold setting module is used for setting a voltage difference threshold value of a high-voltage loop of the vehicle;
the testing module is used for testing the actual voltage difference of the high-voltage loop;
the judging module is used for judging whether the high-voltage loop has hot spot hidden danger or not according to the actual voltage difference and the voltage difference threshold value;
and the early warning module is used for sending out hot spot early warning if the hot spot hidden danger exists in the high-voltage loop.
In a third aspect of embodiments of the present application, a storage medium is provided, where the storage medium includes a stored computer program, where the computer program, when executed, controls a device where the storage medium is located to execute the high-voltage loop hotspot protection method according to the first aspect.
In a fourth aspect of embodiments of the present application, there is provided a vehicle including:
the high-voltage loop hot spot protection device according to the second aspect.
According to the high-voltage loop hot spot protection method and the related equipment, the voltage difference threshold value of the high-voltage loop of the vehicle is set; testing the voltage of the test point positions on the high-voltage loop to obtain the actual voltage difference of any two test point positions; and judging whether the high-voltage loop has hot spot hidden danger or not according to the actual voltage difference and the voltage difference threshold value. According to the method, heating is easily caused by the excessive voltage difference in the high-voltage loop, whether the high-voltage loop has a hot spot hidden danger of local heating is judged by testing the voltage difference between any two test points in the high-voltage loop, if the hot spot hidden danger is judged to exist, hot spot early warning is sent, a vehicle owner or a driver can be reminded of the hot spot hidden danger, and maintenance or danger avoidance can be carried out according to the hot spot early warning. Compared with the prior art, the method for protecting the hot spot of the high-voltage loop of the vehicle is limited to the improvement of the cable layer, and the hot spot is judged whether to occur or not by testing the pressure difference of the high-voltage loop, so that the test of the pressure difference is easier to realize compared with the direct test of the temperature, and the hot spot of the high-voltage loop of the vehicle can be monitored and early warned timely and accurately. The potential hot spot hidden trouble can be prejudged according to the voltage difference before heating, the hot spot can be early warned in advance, the time is striven for vehicle fault maintenance or personnel to avoid danger, and the safety performance of the vehicle can be greatly improved.
Drawings
Fig. 1 is a schematic flow chart of a high-voltage loop hot spot protection method according to an embodiment of the present application;
FIG. 2 is a schematic block diagram of a high-voltage circuit according to an embodiment of the present application;
FIG. 3 is a schematic block diagram of a high-voltage loop hot spot protection device according to an embodiment of the present disclosure;
fig. 4 is a schematic block diagram of a storage medium according to an embodiment of the present application.
Detailed Description
In order to better understand the technical solutions provided by the embodiments of the present specification, the following detailed description of the technical solutions of the embodiments of the present specification is made through the accompanying drawings and the specific embodiments, and it should be understood that the specific features of the embodiments of the present specification are detailed descriptions of the technical solutions of the embodiments of the present specification, and not limit the technical solutions of the present specification, and the technical features of the embodiments of the present specification may be combined with each other without conflict.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The term "two or more" includes two or more cases.
The high-voltage system is a core component of the electric automobile, the high-voltage loop plays a key role in energy transmission and signal transmission in the high-voltage system, and the performance of the high-voltage component can be influenced by overheating of the high-voltage loop, and even the safety of people and automobiles is threatened. In the existing electric automobile, in order to improve the safety of the high-voltage loop, the cable diameter is generally increased within a reasonable range so as to improve the capacity of carrying large current of the cable and avoid overheating of the high-voltage loop. And abnormal heating caused by poor contact at the cable connection part is avoided by reinforcing the cable connection part. However, the existing arrangement of the high-voltage loop is only improved on the cable layer, so that the monitoring and early warning of the hot spot of the high-voltage loop are difficult to realize, and the safety protection performance of the vehicle is poor.
The embodiment of the application provides a high-voltage loop hot spot protection method and related equipment, which can timely monitor and early warn hot spots of a high-voltage loop of a vehicle so as to improve the safety protection performance of the vehicle.
In a first aspect of the embodiments of the present application, a high-voltage loop hotspot protection method is provided, and fig. 1 is a schematic flowchart of a high-voltage loop hotspot protection method provided in the embodiments of the present application. As shown in fig. 1, the high-voltage loop hot spot protection method provided in the embodiment of the present application includes:
s100: a voltage difference threshold of a high voltage loop of the vehicle is set. The vehicle may be an electric vehicle, a hybrid electric vehicle, a small electric vehicle, or the like, and the embodiment of the present application is not particularly limited. The voltage difference threshold may be understood as a monitored threshold of the voltage difference between any two points on the high voltage loop.
S200: and testing the voltage of the test point positions on the high-voltage loop to obtain the actual voltage difference of any two test point positions. If there are a plurality of test points on the high-voltage circuit, there are a plurality of actual voltage differences obtained by measurement.
S300: and judging whether the high-voltage loop has hot spot hidden danger or not according to the actual voltage difference and the voltage difference threshold value. The actual voltage difference and the voltage difference threshold value can be compared, or arithmetic logic and the like can be applied, so as to judge whether the high-voltage loop has hot spot hidden trouble. It is easy to understand that if the voltage difference between any two points obtained by the test is too large, local heating can be easily caused, and hot spots are formed when the local heating is caused, so that hot spot hidden danger is caused. The hidden trouble of the hot spot easily causes spontaneous combustion or failure of the vehicle, and affects the personal safety of personnel on the vehicle for safely driving the vehicle. For example, if the actual voltage difference exceeds the voltage difference threshold, it may be determined that the high-voltage loop has a hot spot hidden trouble, otherwise, it is determined that the high-voltage loop does not have a hot spot hidden trouble.
It should be noted that if the temperature of the high-voltage circuit is directly tested, the high-voltage circuit needs to be fully covered with a temperature sensor, and this way is not easy to achieve in terms of space and cost. Therefore, in the embodiment of the application, according to the fact that the hot spot on the high-voltage loop is caused by overlarge voltage difference, whether the hot spot occurs is judged by monitoring the voltage difference on the high-voltage loop, compared with the method that the temperature sensor is used for testing the temperature, the cost and the space can be saved, the possible hot spot hidden danger can be judged according to the voltage difference before heating, the hot spot can be early warned in advance, time is strived for vehicle fault maintenance or personnel danger avoidance, and the safety performance of the vehicle can be greatly improved.
S400: and if the high-voltage loop has a hot spot hidden trouble, sending out hot spot early warning. The method has the advantages that the hotspot early warning is sent out, the vehicle owners or drivers can be reminded of the hotspot hidden danger, and maintenance or danger avoidance can be carried out according to the hotspot early warning.
According to the high-voltage loop hot spot protection method, the voltage difference threshold value of the high-voltage loop of the vehicle is set; testing the voltage of the test point positions on the high-voltage loop to obtain the actual voltage difference of any two test point positions; and judging whether the high-voltage loop has hot spot hidden danger or not according to the actual voltage difference and the voltage difference threshold value. According to the method, heating is easily caused by the excessive voltage difference in the high-voltage loop, whether the high-voltage loop has a hot spot hidden danger of local heating is judged by testing the voltage difference between any two test points in the high-voltage loop, if the hot spot hidden danger is judged to exist, hot spot early warning is sent, a vehicle owner or a driver can be reminded of the hot spot hidden danger, and maintenance or danger avoidance can be carried out according to the hot spot early warning. Compared with the prior art, the method for protecting the hot spot of the high-voltage loop of the vehicle is limited to the improvement of the cable layer, and the hot spot is judged whether to occur or not by testing the pressure difference of the high-voltage loop, so that the test of the pressure difference is easier to realize compared with the direct test of the temperature, and the hot spot of the high-voltage loop of the vehicle can be monitored and early warned timely and accurately. The potential hot spot hidden trouble can be prejudged according to the voltage difference before heating, the hot spot can be early warned in advance, the time is striven for vehicle fault maintenance or personnel to avoid danger, and the safety performance of the vehicle can be greatly improved.
In some embodiments, fig. 2 is a schematic block diagram of a high-voltage circuit provided in an example of the present application. Illustratively, as shown in fig. 2, the high voltage circuit includes a motor system high voltage circuit 100, a charging variable voltage high voltage circuit 200, a cooling high voltage circuit 300, and a heating high voltage circuit 400. The two ends of the high-voltage loop are respectively provided with a positive high voltage HV+ and a negative high voltage HV-. The two ends of the motor system high-voltage loop 100, the charging voltage high-voltage loop 200, the refrigerating high-voltage loop 300 and the heating high-voltage loop 400 are respectively provided with test points, the test points of the two ends of the motor system high-voltage loop 100 are 1 and 2, the test points of the two ends of the charging voltage high-voltage loop 200 are 3 and 4, the test points of the two ends of the refrigerating high-voltage loop 300 are 5 and 6, and the test points of the two ends of the heating high-voltage loop 400 are 7 and 8. The charging voltage high-voltage circuit 200 further includes a battery circuit BMS and a charger circuit OBCDCDC, which may be connected with a slow charging port, a high-voltage control box, and an ac-dc converter DCDC. The battery loop BMS is connected with a power battery, a high-voltage control box and a quick charging port. The motor system high-voltage loop 100 is connected with a motor controller MCU, a permanent magnet motor and a high-voltage control box. The refrigeration high-pressure circuit 300 is connected to an air conditioner compressor EAC and a high-pressure control box. The heating high-voltage circuit 400 is connected with a heater PTC and a high-voltage controller.
The actual voltage difference may be, for example, the voltage difference between any two of the test sites 1-8.
In some embodiments, step S100 may include:
and testing the maximum voltage difference of any two test points of the high-voltage loop in normal operation. It should be noted that, normal operation means that no local hot spot occurs in the high-voltage loop or no heat is generated due to the voltage difference between any two test points, at this time, the measured voltage difference between any two test points takes the maximum value, and the maximum voltage difference is obtained and can be used as reference data.
And setting a voltage difference threshold of a high-voltage loop of the vehicle according to the maximum voltage difference and the voltage test error. And accumulating the upper voltage test errors by taking the maximum voltage difference as reference data, so that the voltage difference threshold value of the high-voltage loop of the set vehicle can be obtained.
The voltage difference threshold is calibrated. After the voltage difference threshold is obtained, calibration is needed to be used as a standard parameter for judging the hidden danger of the hot spot.
Illustratively, table 1 is voltage data for any two test points of the high voltage loop during normal operation. As shown in table 1, each high-voltage component is used as a test point, where DCDC is an ac-dc converter, and the output voltage of the battery pack, the actual voltage of each high-voltage component, the maximum value and the minimum value of the voltage measured by each high-voltage component, and the maximum value and the minimum value of the voltage received by the VCU are tested respectively. The VCU is a master controller, and it can be known from table 1 that the maximum and minimum values of the real voltages of each high-voltage component are partially inconsistent with the maximum and minimum values of the voltages received by the VCU, and are mainly affected by the accuracy of voltage signal transmission. From the VCU in table 1, the maximum and minimum voltage values were received, and the maximum voltage difference between any two test points was 18V. The data in table 1 are illustrative only and are not intended to be limiting in any way as to the embodiments of the present application.
TABLE 1
It is easy to understand that errors exist in the components and the actual test, and in order to ensure the accuracy of the high-voltage loop hot spot protection method, the test errors of the voltage test instrument need to be considered, and the test errors not only comprise the voltage test errors of the voltage test instrument, but also comprise the sending precision of the voltage signals. Exemplary, table 2 shows the measured voltage test range, the voltage test error range, and the voltage signal transmission accuracy corresponding to the high voltage loop. The values shown in table 2 are illustrative only and are not intended to be limiting in any way in the examples herein.
TABLE 2
By way of example, taking the measured maximum voltage difference 18V of the high-voltage loop in normal operation as a reference, setting the accumulated error of the voltage test error and the electric signal transmission precision to be 2V, and adding the maximum voltage difference and the error to obtain 18+2=20v if the accumulated error 2V is only an illustrative example, and taking the voltage difference threshold to be 20V.
According to the high-voltage loop hot spot protection method, the maximum voltage difference of any two test points of the high-voltage loop in normal operation is actually measured, the voltage difference threshold is obtained according to the maximum voltage difference and the test error, the test error is taken into consideration, the actual test normal value is taken as a reference, and the obtained voltage difference threshold has the reference property, so that whether the excessive actual voltage difference exists can be accurately judged. The voltage difference threshold is used as a judgment standard, so that the actual voltage difference can be accurately judged, and whether hot spot hidden danger exists can be accurately predicted.
In some embodiments, calibrating the voltage difference threshold comprises:
and testing the resistance value of the high-voltage loop. By way of example, the resistance value may include a high voltage cable/cable connector resistance, which may be derived from the sum of the summation of the cable set, the terminal resistance, the crimp resistance, and the contact resistance.
And calculating the maximum theoretical voltage difference of the high-voltage loop according to the resistance value and the maximum current value allowed by the high-voltage loop. According to the formula u=i×r, the maximum allowable voltage of the high-voltage circuit can be obtained, and the maximum theoretical voltage difference of the high-voltage circuit can be obtained by default with the minimum allowable voltage of 0V. The maximum theoretical voltage difference can be understood as the maximum voltage difference that the high-voltage circuit can bear, and exceeding the maximum theoretical voltage difference easily causes the fault of the high-voltage circuit, thereby causing potential safety hazard of the vehicle. The maximum theoretical voltage difference is the voltage drop due to the consumption of the cable, belonging to the conventional consumption.
Illustratively, table 3 is an exemplary number of high voltage cable/cable connector resistances, maximum allowable current values, and maximum theoretical voltage differences for the high voltage loop. The values shown in table 3 are illustrative only and are not intended to be limiting in any way.
TABLE 3 Table 3
The voltage difference threshold is calibrated based on the maximum theoretical voltage difference. The calibration process may be to determine whether the maximum theoretical voltage difference exceeds the voltage difference threshold, and if the maximum theoretical voltage difference exceeds the voltage difference threshold, the voltage difference threshold is set inaccurately and needs to be reset, so as to determine whether the voltage difference threshold is reasonable.
According to the high-voltage loop hot spot protection method, the resistance value of the high-voltage loop is tested, the maximum theoretical voltage difference of the high-voltage loop is calculated according to the resistance value and the maximum current value allowed by the high-voltage loop, and then the voltage difference threshold is calibrated according to the maximum theoretical voltage difference. The set voltage difference threshold is more accurate, and the voltage difference threshold is used as a judgment standard, so that the actual voltage difference can be accurately judged, and whether hot spot hidden danger exists can be more accurately predicted.
In some embodiments, calibrating the voltage difference threshold further comprises:
based on the relationship between the voltage difference and the temperature change, the voltage difference threshold is calibrated according to the maximum safe temperature of the high-voltage loop. Illustratively, the voltage difference versus temperature change may be: the temperature rise of the high-voltage loop is obtained by dividing the maximum heating value per second caused by the voltage difference by the heating value of the copper core of the high-voltage loop, and the maximum heating value per second caused by the voltage difference is obtained by multiplying the voltage difference by the maximum current, wherein the heating value of the copper core is obtained by multiplying the specific heat capacity of copper by the mass of the copper core of the high-voltage loop when the copper core rises by 1 ℃.
Illustratively, the cable insulation material is typically silica gel, the connector insulation material is PA, the temperature rating is 200 ℃, and the thermal overload is tolerated at 250 ℃ for 4 hours. According to the example in the above embodiment, 20V is taken as the voltage difference threshold, 20V is taken as the actual voltage difference of the motor system loop, the maximum allowable current of the motor system loop is 220A, the resistance is 3.02mΩ, the temperature rises 225 ℃ for the first 6.5s according to the peak power of 10s, and the temperature rises for 3.5s after reaching the highest temperature of 250 ℃, and the thermal overload capacity of the cable is not exceeded in consideration of the existence of heat dissipation, so the voltage difference threshold of 20V is set to be safe. The process can be regarded as calibrating the voltage difference threshold according to the maximum safe temperature of the high-voltage loop based on the relationship between the voltage difference and the temperature change.
According to the high-voltage loop hot spot protection method, based on the relation between the voltage difference and the temperature change, the voltage difference threshold is calibrated according to the maximum safe temperature of the high-voltage loop. Therefore, the calibrated voltage difference threshold is more accurate, and the voltage difference threshold is used as a judgment standard, so that the actual voltage difference can be accurately judged, and whether hot spot hidden danger exists can be more accurately predicted.
In some embodiments, if there is a hot spot hidden danger in the high-voltage loop, the hot spot duration threshold is obtained according to the actual voltage difference and the maximum safe temperature of the high-voltage loop based on the relationship between the voltage difference and the temperature change. When the hot spot hidden trouble exists in the high-voltage loop, the highest temperature caused by the actual voltage difference at the moment can be calculated according to a temperature rise calculation formula of the high-voltage loop, the time required for the highest temperature to reach the maximum safe temperature is calculated, and the time is changed into a hot spot duration threshold.
In some embodiments, step S400 may include:
if the high-voltage loop has a hot spot hidden trouble, a hot spot early warning is sent out, and the voltage of the high-voltage loop corresponding to the hot spot hidden trouble is adjusted, wherein the hot spot early warning comprises a hot spot duration threshold value. The hot spot duration threshold value reminds the driver in a fault alarm mode that the driver can remind the driver of safety time for avoiding danger or stopping maintenance, the driver can be further reminded in detail of early warning information, the driver is given enough time to plan maintenance or avoiding danger, and driving safety is further improved. The voltage of the high-voltage loop is adjusted, which belongs to a mode of automatic safety maintenance of the vehicle, and is mainly to adjust the voltage of the high-voltage loop downwards so as to reduce the voltage difference of the high-voltage loop with hot spot hidden danger, so that the vehicle with hot spot faults is automatically adjusted initially, and the safety performance of the vehicle can be improved.
According to the high-voltage loop hot spot protection method, the hot spot duration threshold value reminds a driver of safety time for which the driver needs to do danger avoidance actions or parking maintenance in a fault alarm mode, early warning information of the driver can be further remitted in detail, enough time is provided for the driver to plan maintenance or danger avoidance, and driving safety is further improved. The voltage of the high-voltage loop can be adjusted to reduce the voltage difference of the high-voltage loop with the hot spot hidden trouble, so that the vehicle with the hot spot fault can be automatically adjusted initially, and the safety performance of the vehicle can be improved.
In a second aspect of the embodiments of the present application, a high-voltage loop hot spot protection device is provided, and fig. 3 is a schematic structural block diagram of the high-voltage loop hot spot protection device provided in the embodiments of the present application. As shown in fig. 3, the high-voltage loop hot spot protection device provided in the embodiment of the present application includes:
a threshold setting module 500 for setting a voltage difference threshold of a high-voltage circuit of the vehicle;
a test module 600 for testing an actual voltage difference of the high voltage loop;
the judging module 700 is configured to judge whether a hot spot hidden danger exists in the high-voltage loop according to the actual voltage difference and the voltage difference threshold;
the early warning module 800 is configured to send out an early warning of a hot spot if the high-voltage loop has a hot spot hidden trouble.
In a third aspect of the embodiments of the present application, a storage medium is provided, and fig. 4 is a schematic block diagram of a storage medium provided in an embodiment of the present application. As shown in fig. 4, the storage medium includes a stored computer program 900, wherein the device in which the storage medium is controlled to execute the high voltage loop hot spot protection method as in the first aspect when the computer program 900 is run.
In a fourth aspect of embodiments of the present application, there is provided a vehicle including:
the high-voltage loop hot spot protection device according to the second aspect.
According to the vehicle provided by the embodiment of the application, the voltage difference threshold value of the high-voltage loop of the vehicle is set by the high-voltage loop hot spot protection device; testing the voltage of the test point positions on the high-voltage loop to obtain the actual voltage difference of any two test point positions; and judging whether the high-voltage loop has hot spot hidden danger or not according to the actual voltage difference and the voltage difference threshold value. According to the method, heating is easily caused by the excessive voltage difference in the high-voltage loop, whether the high-voltage loop has a hot spot hidden danger of local heating is judged by testing the voltage difference between any two test points in the high-voltage loop, if the hot spot hidden danger is judged to exist, hot spot early warning is sent, a vehicle owner or a driver can be reminded of the hot spot hidden danger, and maintenance or danger avoidance can be carried out according to the hot spot early warning. Compared with the prior art, the method for protecting the hot spot of the high-voltage loop of the vehicle is limited to the improvement of the cable layer, and the hot spot is judged whether to occur or not by testing the pressure difference of the high-voltage loop, so that the test of the pressure difference is easier to realize compared with the direct test of the temperature, and the hot spot of the high-voltage loop of the vehicle can be monitored and early warned timely and accurately. The potential hot spot hidden trouble can be prejudged according to the voltage difference before heating, the hot spot can be early warned in advance, the time is striven for vehicle fault maintenance or personnel to avoid danger, and the safety performance of the vehicle can be greatly improved.
While preferred embodiments of the present description have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the disclosure.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present specification without departing from the spirit or scope of the specification. Thus, if such modifications and variations of the present specification fall within the scope of the claims and the equivalents thereof, the present specification is also intended to include such modifications and variations.
Claims (6)
1. A high voltage loop hot spot protection method, comprising:
setting a voltage difference threshold of a high-voltage loop of the vehicle;
testing the voltage of a test point on the high-voltage loop to obtain the actual voltage difference of any two test points, wherein the high-voltage loop comprises a motor system high-voltage loop, a charging voltage-variable high-voltage loop, a refrigerating high-voltage loop and a heating high-voltage loop, and the test points are respectively arranged at two ends of the motor system high-voltage loop, the charging voltage-variable high-voltage loop, the refrigerating high-voltage loop and the heating high-voltage loop;
judging whether the high-voltage loop has a hot spot hidden trouble or not according to the actual voltage difference and the voltage difference threshold;
if the high-voltage loop has a hot spot hidden trouble, a hot spot early warning is sent out;
the setting of the voltage difference threshold of the high-voltage loop of the vehicle comprises the following steps:
testing the maximum voltage difference of any two test points of the high-voltage loop in normal operation;
setting the voltage difference threshold of the high-voltage loop of the vehicle according to the maximum voltage difference and a voltage test error;
calibrating the voltage difference threshold;
the calibrating the voltage difference threshold includes:
testing the resistance value of the high-voltage loop;
calculating to obtain the maximum theoretical voltage difference of the high-voltage loop according to the resistance value and the maximum current value allowed by the high-voltage loop;
calibrating the voltage difference threshold according to the maximum theoretical voltage difference;
if the high-voltage loop has a hot spot hidden trouble, a hot spot duration threshold is obtained according to the actual voltage difference and the maximum safe temperature of the high-voltage loop based on the relation between the voltage difference and the temperature change.
2. The high voltage loop hot spot protection method of claim 1, wherein the calibrating the voltage difference threshold further comprises:
and calibrating the voltage difference threshold according to the maximum safe temperature of the high-voltage loop based on the relation between the voltage difference and the temperature change.
3. The method for protecting a hot spot of a high voltage circuit according to claim 1, wherein if there is a hot spot hidden trouble in the high voltage circuit, sending out a hot spot early warning, comprising:
and if the high-voltage loop has a hot spot hidden trouble, sending out the hot spot early warning, and adjusting the voltage of the high-voltage loop corresponding to the hot spot hidden trouble, wherein the hot spot early warning comprises the hot spot duration threshold.
4. A high voltage loop hot spot protection device, comprising:
the threshold setting module is used for setting a voltage difference threshold value of a high-voltage loop of the vehicle;
the testing module is used for testing the voltage of the testing point positions on the high-voltage loop to obtain the actual voltage difference of any two testing point positions, wherein the high-voltage loop comprises a motor system high-voltage loop, a charging voltage high-voltage loop, a refrigerating high-voltage loop and a heating high-voltage loop, and the testing point positions are respectively arranged at two ends of the motor system high-voltage loop, the charging voltage high-voltage loop, the refrigerating high-voltage loop and the heating high-voltage loop;
the judging module is used for judging whether the high-voltage loop has hot spot hidden danger or not according to the actual voltage difference and the voltage difference threshold value;
the early warning module is used for sending out hot spot early warning if the high-voltage loop has hot spot hidden danger;
the setting of the voltage difference threshold of the high-voltage loop of the vehicle comprises the following steps:
testing the maximum voltage difference of any two test points of the high-voltage loop in normal operation;
setting the voltage difference threshold of the high-voltage loop of the vehicle according to the maximum voltage difference and a voltage test error;
calibrating the voltage difference threshold;
the calibrating the voltage difference threshold includes:
testing the resistance value of the high-voltage loop;
calculating to obtain the maximum theoretical voltage difference of the high-voltage loop according to the resistance value and the maximum current value allowed by the high-voltage loop;
calibrating the voltage difference threshold according to the maximum theoretical voltage difference;
the early warning module is further used for obtaining a hot spot duration threshold based on the relation between the voltage difference and the temperature change if the hot spot hidden danger exists in the high-voltage loop and according to the actual voltage difference and the maximum safe temperature of the high-voltage loop.
5. A storage medium, comprising:
a stored computer program, wherein the computer program, when run, controls a device in which the storage medium is located to perform the high voltage loop hotspot protection method of any of claims 1-3.
6. A vehicle, characterized by comprising:
the high voltage loop hot spot protection device of claim 4.
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