An insulation detection system and method for a new energy electric vehicle in cooperation with a vehicle cloud, and a vehicle

Abstract

The application discloses a new energy electric vehicle cloud coordination insulation detection system and method and a vehicle, and belongs to the technical field of electric vehicle insulation detection, and comprises a vehicle end system and a cloud end system. The vehicle end system comprises a voltage sampling module, a vehicle end control module and a vehicle end communication module which are sequentially electrically connected. The cloud end system comprises an insulation data feature library module, a cloud end control module and a cloud end communication module which is connected with the vehicle end communication module through a network. The application determines the insulation determination mode by judging whether the vehicle end system and the cloud end system are in normal communication. When the vehicle end system insulation diagnosis determination is determined, the insulation detection accuracy is improved to effectively prevent insulation false reporting. When the cloud end system insulation diagnosis determination method is determined, insulation fault can be quickly confirmed, so that the insulation detection accuracy can be improved, the insulation detection time can be shortened, and insulation abnormal states can be quickly identified.

Description

TECHNICAL FIELD

[0001] The application discloses a new energy electric vehicle cloud cooperation insulation detection system and method and a vehicle, and belongs to the technical field of electric vehicle insulation detection. BACKGROUND

[0002] At present, the insulation detection method of the new energy electric vehicle mostly adopts the national standard electric bridge method. As the electric vehicle is used more and more and the environment is more and more complex, in addition to the high-voltage components of the vehicle itself, there are external alternating current and direct current charging equipment and V2V (vehicle-to-vehicle), V2L (vehicle-to-load), V2G (vehicle-to-grid) and other external equipment. The introduction of these components may affect the insulation detection accuracy of the vehicle, cause insulation abnormal false alarm, cause customer complaints, and may also cause the insulation performance of the vehicle to decrease, and in severe cases, may cause personnel contact, which is a technical problem that has been solved in the industry. SUMMARY

[0003] In view of the defects of the prior art, the application provides a new energy electric vehicle cloud cooperation insulation detection system and method and a vehicle, which can improve the insulation detection accuracy, effectively prevent insulation false alarm, shorten the insulation detection time, and quickly identify the insulation abnormal state.

[0004] The technical scheme of the application is as follows:

[0005] According to a first aspect of the embodiment of the application, a new energy electric vehicle cloud cooperation insulation detection system is provided, which comprises a vehicle end system, the vehicle end system comprises a first insulation resistor and a first resistor connected with a high-voltage positive electrode of a power battery at one end, and a second insulation resistor and a fourth resistor connected with a high-voltage negative electrode of the power battery at one end, a series connection point of the other end of the first insulation resistor and the second insulation resistor is connected with a vehicle body ground, a second resistor and a third resistor are further connected in series between the first resistor and the fourth resistor, a series connection point between the second resistor and the third resistor is connected with the vehicle body ground, a series connection point of the first resistor and the second resistor is connected with one end of a high-voltage contactor, the other end of the high-voltage contactor is connected with the high-voltage negative electrode of the power battery, and a series connection point of the third resistor and the fourth resistor is connected with an AD sampling module, characterized in that the system further comprises a cloud end system, the cloud end system comprises an insulation data feature library module and a cloud end communication module electrically connected with a cloud end control module, the vehicle end system further comprises a voltage sampling module, a vehicle end control module and a vehicle end communication module network connected with the cloud end communication module connected in series in an electrical manner, and the voltage sampling module is electrically connected with the AD sampling module and the high-voltage positive electrode and negative electrode of the power battery.

[0006] Preferably, the voltage sampling module is configured to obtain the total voltage of the power battery under the current vehicle working condition, vehicle position information and vehicle working mode, and obtain the voltage value of the fourth resistor by the third resistor value, the fourth resistor value and the AD sampling module when the high-voltage contactor is opened or attracted, so as to obtain the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened or attracted.

[0007] The vehicle end control module is configured to obtain the insulation resistance value of the vehicle end according to the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened or attracted, the first resistor value, the second resistor value, the third resistor value, the fourth resistor value and the total voltage of the power battery under the current vehicle working condition, vehicle position information and vehicle working mode, and perform insulation monitoring confidence judgment strategy and insulation resistance value credibility judgment strategy on the insulation resistance value of the vehicle end to obtain the insulation resistance value of the vehicle end to be tested.

[0008] It is also configured to perform fault judgment on the insulation resistance value of the vehicle end to be tested to obtain a fault judgment result and perform corresponding reporting processing.

[0009] The vehicle end communication module and the cloud end communication module are configured to detect the validity and timing of the communication data in real time to determine whether the communication is normal.

[0010] Yes, the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened or attracted under the current vehicle working condition, vehicle position information and vehicle working mode, and the insulation resistance value of the vehicle end to be tested are sent to the cloud end control module.

[0011] No, the insulation resistance value of the vehicle end to be tested is used to perform fault judgment to obtain a vehicle end fault judgment result and perform corresponding reporting processing.

[0012] Preferably, the insulation data feature library module is configured to store the voltage value relationship data model of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened or attracted under different vehicle working conditions, different vehicle position information and different vehicle working modes.

[0013] The cloud end control module is configured to obtain the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened or attracted sent by the vehicle end control module, and match the data model in the insulation data feature library module to obtain a matching degree, and determine whether the matching degree exceeds the insulation data feature library matching degree threshold:

[0014] Yes, the matching is successful, and the cloud end insulation resistance value and the cloud end insulation resistance value credibility are obtained to perform the next step.

[0015] No, the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened or attracted sent by the vehicle end control module is comprehensively analyzed.

[0016] determining whether the cloud insulation resistance credibility is credible:

[0017] Yes, execute the next step;

[0018] No, send the cloud insulation resistance and the cloud insulation resistance credibility to the insulation data feature library module storage, and track the data model in the insulation data feature library module to obtain the cloud fault judgment result as insulation interference early warning sent to the vehicle end control module;

[0019] Obtain the vehicle end to be tested insulation resistance, and obtain the cloud to be tested insulation resistance by the cloud insulation resistance and the vehicle end to be tested insulation resistance;

[0020] Determine whether the cloud to be tested insulation resistance exceeds the insulation fault threshold:

[0021] Yes, record the cloud insulation overrun times and execute the next step;

[0022] No, obtain the cloud fault judgment result as vehicle insulation normal sent to the vehicle end control module and the insulation overrun times are cleared, and re-determine;

[0023] Determine whether the cloud insulation overrun times exceeds the cloud insulation fault times threshold:

[0024] Yes, generate the cloud fault judgment result as insulation anomaly early warning and send it to the vehicle end control module;

[0025] No, generate the cloud fault judgment result as no alarm, and re-determine the matching degree;

[0026] The vehicle end control module is also used to obtain the cloud fault judgment result sent by the cloud end control module and perform corresponding reporting processing.

[0027] Preferably, the cloud to be tested insulation resistance obtained by the cloud insulation resistance and the vehicle end to be tested insulation resistance includes:

[0028] Determine whether the absolute value of the difference between the cloud insulation resistance and the vehicle end insulation resistance and the ratio of the larger value of the cloud insulation resistance and the vehicle end insulation resistance exceeds the cloud insulation resistance and the vehicle end insulation resistance deviation percentage threshold:

[0029] Yes, obtain the insulation data feature library maturity and execute the next step;

[0030] No, the smaller of the cloud insulation resistance and the vehicle end to be tested insulation resistance is the cloud to be tested insulation resistance;

[0031] Determine whether the insulation data feature library maturity exceeds the insulation data feature library maturity threshold:

[0032] is, the cloud insulation resistance value and the cloud insulation resistance value credibility are sent to the insulation data feature library module storage, and the cloud fault judgment result is generated by using the vehicle end to-be-tested insulation resistance value to perform fault judgment to obtain a vehicle end fault judgment result and perform corresponding reporting processing;

[0033] No, the cloud insulation resistance value is a cloud to-be-tested insulation resistance value, and the next step is executed.

[0034] According to a second aspect of the embodiment of the application, a new energy electric vehicle cloud cooperation insulation detection method is provided, which is applied to the new energy electric vehicle cloud cooperation insulation detection system of the first aspect, and characterized in that it comprises:

[0035] determining whether the insulation detection opening condition is met;

[0036] If yes, the vehicle end insulation resistance value is obtained according to the voltage value of the power battery negative pole to the vehicle body ground, the first resistance value, the second resistance value, the third resistance value, the fourth resistance value and the total voltage of the power battery when the control high-voltage contactor is opened or attracted under the current vehicle working condition, vehicle position information and vehicle working mode, and the insulation monitoring confidence judgment strategy and the insulation resistance value credibility judgment strategy are executed to obtain the vehicle end to-be-tested insulation resistance value;

[0037] a fault judgment result is obtained by using the vehicle end to-be-tested insulation resistance value to perform fault judgment, and corresponding reporting processing is performed.

[0038] Preferably, the determination of whether the insulation detection opening condition is met comprises:

[0039] determining whether the initialization of the new energy electric vehicle cloud cooperation insulation detection system is completed:

[0040] Yes, the next step is executed;

[0041] No, the initialization strategy of the new energy electric vehicle cloud cooperation insulation detection system is continuously executed, and the determination is re-performed until completion;

[0042] determining whether the action diagnosis time of the high-voltage contactor attraction or disconnection is reached:

[0043] Yes, the next step is executed;

[0044] No, the action diagnosis strategy of the high-voltage contactor attraction or disconnection is continuously executed, and the time determination is re-performed until completion;

[0045] determining whether the vehicle end external device access delay time is reached:

[0046] Yes, the next step is executed;

[0047] No, continue to execute the vehicle end external device access delay strategy and re-perform time judgment until completion.

[0048] Preferably, the insulation monitoring confidence determination strategy comprises:

[0049] In the current vehicle operating condition, vehicle location information and vehicle operating mode, when the high-voltage contactor state is controlled to be open, the voltage values of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is opened, the voltage values of the power battery negative electrode to the vehicle body ground n seconds after the high-voltage contactor is opened, and the voltage values of the power battery negative electrode to the vehicle body ground X seconds after the high-voltage contactor is opened are obtained, respectively, wherein n = 2... X-1.

[0050] In the current vehicle operating condition, vehicle location information and vehicle operating mode, when the high-voltage contactor state is controlled to be open, the voltage values of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is opened, the voltage values of the power battery negative electrode to the vehicle body ground n seconds after the high-voltage contactor is opened, and the voltage values of the power battery negative electrode to the vehicle body ground X seconds after the high-voltage contactor is opened are obtained, respectively, wherein n = 2... X-1.

[0051] When the voltage value of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is opened is less than the voltage value of the power battery negative electrode to the vehicle body ground n seconds after the high-voltage contactor is opened, which is less than the voltage value of the power battery negative electrode to the vehicle body ground X seconds after the high-voltage contactor is opened, it comprises:

[0052] When the voltage value of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is opened is greater than the voltage value of the power battery negative electrode to the vehicle body ground n seconds after the high-voltage contactor is opened, which is greater than the voltage value of the power battery negative electrode to the vehicle body ground X seconds after the high-voltage contactor is opened, the insulation monitoring confidence is A.

[0053] When the voltage value of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is opened is less than the voltage value of the power battery negative electrode to the vehicle body ground n seconds after the high-voltage contactor is opened, which is less than the voltage value of the power battery negative electrode to the vehicle body ground X seconds after the high-voltage contactor is opened, it comprises:

[0054] When the voltage value of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is opened is greater than the voltage value of the power battery negative electrode to the vehicle body ground n seconds after the high-voltage contactor is opened, which is greater than the voltage value of the power battery negative electrode to the vehicle body ground X seconds after the high-voltage contactor is opened, the insulation monitoring confidence is A.

[0055] When the voltage value of the power battery negative pole to the vehicle body ground 1 second after the high-voltage contactor is opened > the voltage value of the power battery negative pole to the vehicle body ground n seconds after the high-voltage contactor is opened > the voltage value of the power battery negative pole to the vehicle body ground X seconds after the high-voltage contactor is opened:

[0056] Determine whether the voltage value of the power battery negative pole to the vehicle body ground 1 second after the high-voltage contactor is attracted > the voltage value of the power battery negative pole to the vehicle body ground n seconds after the high-voltage contactor is attracted > the voltage value of the power battery negative pole to the vehicle body ground X seconds after the high-voltage contactor is attracted:

[0057] Yes, the insulation monitoring confidence is B;

[0058] No, the insulation monitoring confidence is D;

[0059] When the voltage value of the power battery negative pole to the vehicle body ground 1 second after the high-voltage contactor is opened > the voltage value of the power battery negative pole to the vehicle body ground n seconds after the high-voltage contactor is opened & the voltage value of the power battery negative pole to the vehicle body ground X seconds after the high-voltage contactor is opened > the voltage value of the power battery negative pole to the vehicle body ground n seconds after the high-voltage contactor is opened:

[0060] Determine whether the voltage value of the power battery negative pole to the vehicle body ground 1 second after the high-voltage contactor is attracted > the voltage value of the power battery negative pole to the vehicle body ground n seconds after the high-voltage contactor is attracted > the voltage value of the power battery negative pole to the vehicle body ground X seconds after the high-voltage contactor is attracted:

[0061] Yes, the insulation monitoring confidence is C;

[0062] No, the insulation monitoring confidence is D;

[0063] When the voltage value of the power battery negative pole to the vehicle body ground 1 second after the high-voltage contactor is opened < the voltage value of the power battery negative pole to the vehicle body ground n seconds after the high-voltage contactor is opened & the voltage value of the power battery negative pole to the vehicle body ground X seconds after the high-voltage contactor is opened < the voltage value of the power battery negative pole to the vehicle body ground n seconds after the high-voltage contactor is opened:

[0064] Determine whether the voltage value of the power battery negative pole to the vehicle body ground 1 second after the high-voltage contactor is attracted > the voltage value of the power battery negative pole to the vehicle body ground n seconds after the high-voltage contactor is attracted > the voltage value of the power battery negative pole to the vehicle body ground X seconds after the high-voltage contactor is attracted:

[0065] Yes, the insulation monitoring confidence is C;

[0066] No, the insulation monitoring confidence is D.

[0067] 8. The new energy electric vehicle cloud coordination insulation detection method according to claim 7, characterized in that the insulation resistance credibility determination strategy comprises:

[0068] In the current vehicle working condition, vehicle position information and vehicle working mode, the first insulation monitoring confidence and the second insulation monitoring confidence obtained by the insulation monitoring confidence determination strategy are obtained twice respectively;

[0069] When the first insulation monitoring confidence is A or B and the second insulation monitoring confidence is A, the vehicle end insulation resistance is credible, the insulation resistance untrusted number count is cleared, and the vehicle end insulation resistance is the vehicle end to-be-measured insulation resistance;

[0070] When the first insulation monitoring confidence is C or D and the second insulation monitoring confidence is A, or when the first insulation monitoring confidence is A, B, C or D and the second insulation monitoring confidence is B, accurate judgment cannot be made, the insulation monitoring confidence is obtained again once in the current vehicle working condition, vehicle position information and vehicle working mode, and the second insulation monitoring confidence is used as the new first insulation monitoring confidence for next time judgment. The insulation monitoring confidence is obtained again once and is the new second insulation monitoring confidence for re-judgment;

[0071] When the first insulation monitoring confidence is A, B, C or D and the second insulation monitoring confidence is C or D, the vehicle end insulation resistance part is untrusted, the insulation resistance untrusted number count is counted by 1 and whether it is greater than the insulation external interference threshold is judged:

[0072] Yes, the vehicle end fault judgment result is that the whole vehicle high-voltage system is in an unstable state, there is external persistent interference and corresponding report processing is performed;

[0073] No, whether the insulation detection opening condition is met is re-judged and the vehicle end insulation resistance is re-obtained.

[0074] Preferably, the fault judgment result obtained by the fault judgment through the vehicle end to-be-measured insulation resistance is obtained and corresponding report processing is performed, comprising:

[0075] The validity and time sequence of the communication data are detected in real time through the vehicle end communication module and the cloud end communication module to judge whether the communication is normal:

[0076] Yes, the voltage value of the power battery negative pole to the vehicle body ground and the vehicle end to-be-measured insulation resistance when the high-voltage contactor is opened or attracted are sent to the cloud end control module under the control of the current vehicle working condition, vehicle position information and vehicle working mode respectively, the cloud end fault judgment result sent by the cloud end control module is obtained and corresponding report processing is performed;

[0077] No, the vehicle end to be tested insulation resistance value is judged to obtain a vehicle end fault judgment result and corresponding reporting processing, including:

[0078] Judge whether the vehicle end to be tested insulation resistance value exceeds the insulation fault threshold value:

[0079] Yes, record the number of times of vehicle end insulation over-limit and execute the next step;

[0080] No, the vehicle end fault judgment result is obtained as the whole vehicle insulation is normal and the number of times of insulation over-limit is cleared, and re-judgment is performed;

[0081] Judge whether the number of times of vehicle end insulation over-limit exceeds the number of times of vehicle end insulation fault threshold value:

[0082] Yes, the cloud end fault judgment result is generated as insulation abnormality warning and the insulation fault whole vehicle insulation warning light is reported to be lit;

[0083] No, the cloud end fault judgment result is generated as no alarm, and whether the insulation detection start condition is met is re-judged and the vehicle end insulation resistance value is re-acquired.

[0084] According to a third aspect of the embodiment of the application, a vehicle is provided, comprising:

[0085] The vehicle end system, the processor, and the memory in communication connection with the processor of the first aspect;

[0086] The vehicle end system is used for insulation detection of the power battery and the high-voltage contactor;

[0087] The memory stores computer execution instructions;

[0088] The processor executes the computer execution instructions stored in the memory to realize the insulation detection method of the new energy electric vehicle cloud cooperation of the first aspect.

[0089] The beneficial effects of the application are that:

[0090] The application provides an insulation detection system and method of new energy electric vehicle cloud cooperation and a vehicle, which determines an insulation determination method by judging whether the vehicle end system and the cloud end system are in normal communication, improves insulation detection accuracy when the vehicle end system insulation diagnosis determination, effectively prevents insulation false reporting, and when the cloud end system insulation diagnosis determination method, insulation fault can be quickly confirmed, so that insulation detection accuracy can be improved, insulation detection time can be shortened, and insulation abnormal state can be quickly identified.

[0091] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0092] Figure 1 is a structural diagram of a new energy electric vehicle cloud coordination insulation detection system according to an exemplary embodiment;

[0093] Figure 2 is a flow chart of a new energy electric vehicle cloud coordination insulation detection method according to an exemplary embodiment.

[0094] Figure 3 is a structural block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0095] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0096] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0097] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0098] First embodiment

[0099] As Figure 1As shown, the first embodiment of the present application provides a new energy electric vehicle cloud collaborative insulation detection system based on the prior art, which comprises a vehicle end system and a cloud end system. The vehicle end system comprises a first insulation resistance RP and a first resistance R1 connected with a power battery high-voltage positive electrode Bat+ at one end, and a second insulation resistance RN and a fourth resistance R4 connected with a power battery high-voltage negative electrode Bat- at one end. The series connection point of the first insulation resistance RP and the second insulation resistance RN at the other end is connected with a vehicle body ground GND. A second resistance R2 and a third resistance R3 are further connected in series between the first resistance R1 and the fourth resistance R4. The series connection point between the second resistance R2 and the third resistance R3 is connected with the vehicle body ground GND. The series connection point of the first resistance R1 and the second resistance R2 is connected with one end of a high-voltage contactor S1, and the other end of the high-voltage contactor S1 is connected with the power battery high-voltage negative electrode Bat-. The series connection point of the third resistance R3 and the fourth resistance R4 is connected with an AD sampling module. The cloud end system comprises an insulation data feature library module and a cloud communication module electrically connected with a cloud end control module. The vehicle end system further comprises a voltage sampling module, a vehicle end control module, and a vehicle end communication module network connected with the cloud communication module. The voltage sampling module is electrically connected with the AD sampling module and the power battery high-voltage positive electrode Bat+ and negative electrode Bat-. The functions of each module will be introduced below.

[0100] Firstly, the voltage sampling module is introduced, which is used to obtain the total voltage UBAT of the power battery under the current vehicle working condition, vehicle position information and vehicle working mode, and combine the third resistance value R3, the fourth resistance value R4 and the voltage value of the fourth resistance collected by the AD sampling module when the high-voltage contactor S1 is disconnected or attracted to obtain the voltage value of the power battery negative electrode to the vehicle body ground when the high-voltage contactor S1 is disconnected or attracted through formulas (1) and (2) respectively:

[0101]

[0102]

[0103] In formulas (1) and (2), U1 is the voltage value of the power battery negative electrode to the vehicle body ground when the high-voltage contactor S1 is disconnected, Vad1 is the voltage value of the fourth resistance collected by the AD sampling module when the high-voltage contactor S1 is disconnected, R3 is the resistance value of the third resistance, and R4 is the resistance value of the fourth resistance. In formula (2), U2 is the voltage value of the power battery negative electrode to the vehicle body ground when the high-voltage contactor S1 is attracted, and Vad2 is the voltage value of the fourth resistance collected by the AD sampling module when the high-voltage contactor S1 is attracted.

[0104] The vehicle end control module is configured to obtain the vehicle end insulation resistance value according to the voltage value of the negative electrode of the power battery to the vehicle body ground, the first resistance value, the second resistance value, the third resistance value, the fourth resistance value and the total voltage UBAT of the power battery when the high-voltage contactor is opened or attracted under the current vehicle working condition, vehicle position information and vehicle working mode, and the specific content is as follows:

[0105] The first insulation resistance RP and the second insulation resistance PN are obtained by the formulas (3) and (4) respectively according to the voltage value of the negative electrode of the power battery to the vehicle body ground, the first resistance value, the second resistance value, the third resistance value, the fourth resistance value and the total voltage UBAT of the power battery when the high-voltage contactor is opened or attracted under the current vehicle working condition, vehicle position information and vehicle working mode.

[0106]

[0107]

[0108] In the formulas (3) and (4), RP is the resistance value of the first insulation resistance, PN is the resistance value of the second insulation resistance, R1 is the resistance value of the first resistance, R2 is the resistance value of the second resistance, and UBAT is the total voltage of the power battery.

[0109] The vehicle end insulation resistance value is obtained by the resistance value of the first insulation resistance RP and the second insulation resistance PN, and the specific content is as follows:

[0110] One embodiment: the smaller value of the resistance value of the first insulation resistance RP and the second insulation resistance PN is the vehicle end insulation resistance value.

[0111] Another embodiment: considering the insulation monitoring accuracy, the general insulation accuracy has both positive and negative biases. If the insulation value appears positive bias, it may cause that the abnormal insulation resistance value cannot be accurately reported. Therefore, the vehicle end insulation resistance value is obtained by the formula (5) using the resistance value of the first insulation resistance RP and the resistance value of the second insulation resistance PN, and the fault threshold value is judged.

[0112]

[0113] Wherein: R is the vehicle end insulation resistance value.

[0114] The insulation monitoring confidence determination strategy and the insulation resistance value credibility determination strategy are performed on the vehicle end insulation resistance value to obtain the vehicle end to-be-measured insulation resistance value.

[0115] The validity and timing of the communication data are detected in real time by the vehicle end communication module and the cloud communication module to determine whether the communication is normal.

[0116] Yes, send the voltage value of the power battery negative pole to the vehicle body ground and the measured insulation resistance value of the vehicle end to the cloud control module when the current vehicle working condition, vehicle position information and vehicle working mode control the high-voltage contactor to be disconnected or attracted;

[0117] No, the vehicle end fault judgment result is obtained by fault judgment through the measured insulation resistance value of the vehicle end, and corresponding reporting processing is performed. The following will introduce the insulation data feature library module, which is used to store the voltage value relationship data model of the power battery negative pole to the vehicle body ground when the high-voltage contactor is disconnected or attracted under different working conditions, different position information and different working modes of the vehicle;

[0118] The cloud control module is used to obtain the voltage value of the power battery negative pole to the vehicle body ground when the high-voltage contactor is disconnected or attracted sent by the vehicle end control module, and match it with the data model in the insulation data feature library module. The voltage values at the beginning and end of U1 and U2 in one sampling period are matched by comparison, and / or the voltage values of the power battery negative pole to the vehicle body ground when the high-voltage contactor S1 is disconnected and the voltage values of the power battery negative pole to the vehicle body ground when the high-voltage contactor S1 is attracted are matched by comparison. The cloud can compare the trend change with 100ms as a unit, and the vehicle end BMS matches with 1s as a unit to obtain the matching degree, and judges whether the matching degree exceeds the insulation data feature library matching degree threshold β:

[0119] Yes, the cloud insulation resistance value and the cloud insulation resistance value credibility are obtained by successful matching, and the next step is executed;

[0120] No, the voltage value of the power battery negative pole to the vehicle body ground when the high-voltage contactor is disconnected or attracted sent by the vehicle end control module is comprehensively analyzed;

[0121] The insulation data feature library matching degree threshold can be defined as 80% in this embodiment.

[0122] Judge whether the cloud insulation resistance value credibility is credible:

[0123] Yes, the next step is executed;

[0124] No, the cloud insulation resistance value and the cloud insulation resistance value credibility are sent to the insulation data feature library module for storage, and the cloud end fault judgment result is obtained by tracking the data model in the insulation data feature library module, and sent to the vehicle end control module. For example: if it appears during direct current charging, it can remind the user that the insulation state of the charging pile is poor, and it is recommended to use other charging equipment.

[0125] Judge whether the absolute value of the difference between the cloud insulation resistance value and the vehicle end insulation resistance value and the ratio of the larger value of the cloud insulation resistance value and the vehicle end insulation resistance value exceeds the cloud insulation resistance value and the vehicle end insulation resistance value deviation percentage threshold γ:

[0126] Yes, get the insulation data feature library maturity and perform the next step;

[0127] No, it is explained that the data model this time exists in the insulation data feature library module and does not need to be updated. The smaller one of the cloud insulation resistance value and the vehicle end insulation resistance value to be measured is taken as the cloud insulation resistance value to be measured.

[0128] The cloud insulation resistance value and the vehicle end insulation resistance value deviation percentage threshold γ can be defined as 10% in the embodiment.

[0129] Determine whether the insulation data feature library maturity exceeds the insulation data feature library maturity threshold σ:

[0130] Yes, send the cloud insulation resistance value and the cloud insulation resistance value credibility to the insulation data feature library module storage, and generate the cloud fault judgment result as the vehicle end fault judgment result obtained by using the vehicle end insulation resistance value to be measured for fault judgment and perform corresponding reporting processing.

[0131] No, take the cloud insulation resistance value as the cloud insulation resistance value to be measured, and perform the next step.

[0132] The insulation data feature library maturity threshold σ represents the maturity of the data feature library. From the development stage, the test calibration stage, the production stage, and the after-sales stage, the data feature library is continuously updated and the maturity is continuously improved. The scheme defines that the production stage ends and the insulation data feature library maturity reaches σ.

[0133] Determine whether the cloud insulation resistance value to be measured exceeds the cloud insulation fault threshold:

[0134] Yes, record the cloud insulation overrun times and perform the next step.

[0135] No, get the cloud fault judgment result as the whole vehicle insulation normal sent to the vehicle end control module and the insulation overrun times are cleared, and re-determine.

[0136] Determine whether the cloud insulation overrun times exceed the cloud insulation fault times threshold:

[0137] Yes, generate the cloud fault judgment result as insulation anomaly early warning and send it to the vehicle end control module.

[0138] No, generate the cloud fault judgment result as no alarm, and re-determine the matching degree.

[0139] The vehicle end control module is also used to get the cloud fault judgment result sent by the cloud control module and perform corresponding reporting processing.

[0140] Second embodiment

[0141] As Figure 2As shown, the second embodiment of the present application provides a new energy electric vehicle cloud coordination insulation detection method based on the first embodiment, and the specific content is as follows:

[0142] Step 101, judge whether the insulation detection start condition is met, and the content is as follows:

[0143] Judge whether the insulation detection system initialization of the new energy electric vehicle cloud coordination is completed:

[0144] Yes, execute the next step;

[0145] No, continue to execute the initialization strategy of the insulation detection system of the new energy electric vehicle cloud coordination and rejudge until completion;

[0146] Judge whether the action diagnosis time of the high-voltage contactor attraction or disconnection reaches:

[0147] Yes, execute the next step;

[0148] No, continue to execute the action diagnosis strategy of the high-voltage contactor attraction or disconnection and rejudge the time until completion;

[0149] Judge whether the access delay time of the external device of the vehicle end reaches:

[0150] Yes, execute the next step;

[0151] No, continue to execute the access delay strategy of the external device of the vehicle end and rejudge the time until completion.

[0152] Step 102, under the current vehicle working condition, vehicle position information and vehicle working mode, the insulation resistance value of the vehicle end is obtained according to the voltage value of the power battery negative pole to the vehicle body ground, the first resistance value, the second resistance value and the total voltage of the power battery when the high-voltage contactor is controlled to be disconnected or attracted, and the insulation monitoring confidence judgment strategy and the insulation resistance value credibility judgment strategy are executed to obtain the insulation resistance value to be measured of the vehicle end;

[0153] Under the current vehicle working condition, vehicle position information and vehicle working mode, the insulation resistance value of the vehicle end is obtained according to the voltage value of the power battery negative pole to the vehicle body ground, the first resistance value, the second resistance value and the total voltage of the power battery when the high-voltage contactor is controlled to be disconnected or attracted;

[0154] Under the current vehicle working condition, vehicle position information and vehicle working mode, the insulation monitoring confidence judgment strategy is executed, and the content is as follows:

[0155] In the current vehicle operating condition, vehicle position information and vehicle working mode, when the high-voltage contactor state is controlled to be open, the voltage value U11 of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is opened, the voltage value U1n of the power battery negative electrode to the vehicle body ground n second after the high-voltage contactor is opened, and the voltage value U1x of the power battery negative electrode to the vehicle body ground X second after the high-voltage contactor is opened are obtained, respectively, wherein: n = 2...X-1, the high-voltage contactor S1 state switching time is X seconds, and the insulation monitoring period is 2*X seconds;

[0156] In the current vehicle operating condition, vehicle position information and vehicle working mode, when the high-voltage contactor state is controlled to be open, the voltage value U11 of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is opened, the voltage value U1n of the power battery negative electrode to the vehicle body ground n second after the high-voltage contactor is opened, and the voltage value U1x of the power battery negative electrode to the vehicle body ground X second after the high-voltage contactor is opened are obtained, respectively, wherein: n = 2...X-1, the high-voltage contactor S1 state switching time is X seconds, and the insulation monitoring period is 2*X seconds;

[0157] When the voltage value U11 of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is opened is less than the voltage value U1n of the power battery negative electrode to the vehicle body ground n second after the high-voltage contactor is opened, which is less than the voltage value U1x of the power battery negative electrode to the vehicle body ground X second after the high-voltage contactor is opened, the insulation monitoring confidence is A.

[0158] When the voltage value U21 of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is closed is greater than the voltage value U2n of the power battery negative electrode to the vehicle body ground n second after the high-voltage contactor is closed, which is greater than the voltage value U2x of the power battery negative electrode to the vehicle body ground X second after the high-voltage contactor is closed, the insulation monitoring confidence is B.

[0159] When the voltage value U21 of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is closed is less than the voltage value U2n of the power battery negative electrode to the vehicle body ground n second after the high-voltage contactor is closed, which is less than the voltage value U2x of the power battery negative electrode to the vehicle body ground X second after the high-voltage contactor is closed, the insulation monitoring confidence is B.

[0160] When the voltage value U21 of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is closed is greater than the voltage value U2n of the power battery negative electrode to the vehicle body ground n second after the high-voltage contactor is closed, which is greater than the voltage value U2x of the power battery negative electrode to the vehicle body ground X second after the high-voltage contactor is closed, or the voltage value U21 of the power battery negative electrode to the vehicle body ground 1 second after the high-voltage contactor is closed is less than the voltage value U2n of the power battery negative electrode to the vehicle body ground n second after the high-voltage contactor is closed, which is less than the voltage value U2x of the power battery negative electrode to the vehicle body ground X second after the high-voltage contactor is closed, the insulation monitoring confidence is C.

[0161] U1x > U1n when the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is opened for the first second U11 is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened for the nth second U1n and the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is opened for the Xth second U1x is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened for the nth second U1n:

[0162] U2x when the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is attracted for the first second U21 is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is attracted for the nth second U2n and the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is attracted for the Xth second U2x is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is attracted for the nth second U2n:

[0163] Yes, the insulation monitoring confidence is B;

[0164] No, the insulation monitoring confidence is D;

[0165] U1x > U1n when the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is opened for the first second U11 is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened for the nth second U1n and the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is opened for the Xth second U1x is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened for the nth second U1n:

[0166] U2x when the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is attracted for the first second U21 is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is attracted for the nth second U2n and the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is attracted for the Xth second U2x is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is attracted for the nth second U2n:

[0167] Yes, the insulation monitoring confidence is C;

[0168] No, the insulation monitoring confidence is D;

[0169] U1x > U1n when the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is opened for the first second U11 is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened for the nth second U1n and the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is opened for the Xth second U1x is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is opened for the nth second U1n:

[0170] U2x when the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is attracted for the first second U21 is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is attracted for the nth second U2n and the voltage value of the negative electrode of the power battery to the vehicle body ground after the high-voltage contactor is attracted for the Xth second U2x is greater than the voltage value of the negative electrode of the power battery to the vehicle body ground when the high-voltage contactor is attracted for the nth second U2n:

[0171] Yes, the insulation monitoring confidence is C;

[0172] No, the insulation monitoring confidence is D.

[0173] In the current vehicle operating condition, vehicle position information and vehicle working mode, the insulation resistance credibility determination strategy is executed, and the contents are as follows:

[0174] In the current vehicle operating condition, vehicle position information and vehicle working mode, the first insulation monitoring confidence and the second insulation monitoring confidence obtained by the two insulation monitoring confidence determination strategies are obtained respectively;

[0175] When the first insulation monitoring confidence is A or B and the second insulation monitoring confidence is A, the vehicle end insulation resistance is credible, and the insulation resistance untrusted number count is cleared. The vehicle end insulation resistance is the vehicle end insulation resistance to be measured.

[0176] When the first insulation monitoring confidence is C or D and the second insulation monitoring confidence is A, or when the first insulation monitoring confidence is A, B, C or D and the second insulation monitoring confidence is B, accurate judgment cannot be made, and the insulation monitoring confidence is obtained again in the current vehicle operating condition, vehicle position information and vehicle working mode. The second insulation monitoring confidence is used as the new first insulation monitoring confidence for next judgment. The new second insulation monitoring confidence is obtained again, and the judgment is performed again.

[0177] When the first insulation monitoring confidence is A, B, C or D and the second insulation monitoring confidence is C or D, the vehicle end insulation resistance part is not trusted, and the insulation resistance untrusted number count is increased by 1 and whether it is greater than the insulation external interference threshold α is judged:

[0178] Yes, the vehicle end fault judgment result is that the whole vehicle high-voltage system is in an unstable state, there is external persistent interference, and corresponding reporting processing is performed.

[0179] No, it is judged again whether the insulation detection opening condition is met, and the vehicle end insulation resistance is obtained again.

[0180] Step 103, fault judgment is performed through the vehicle end insulation resistance to be measured to obtain a fault judgment result and corresponding reporting processing is performed, and the specific contents are as follows:

[0181] The validity and time sequence of the communication data are detected in real time through the vehicle end communication module and the cloud end communication module to judge whether the communication is normal:

[0182] Yes, the current vehicle operating condition, vehicle position information and vehicle working mode are respectively controlled to send the voltage value of the power battery negative pole to the vehicle body ground and the vehicle end insulation resistance to be measured to the cloud end control module when the high-voltage contactor is opened or attracted, and the cloud end fault judgment result sent by the cloud end control module is obtained and corresponding reporting processing is performed.

[0183] No, the vehicle end fault judgment result is obtained by performing fault judgment through the vehicle end insulation resistance to be measured, and corresponding reporting processing is performed, including:

[0184] determining whether the insulation resistance of the vehicle end to be measured exceeds an insulation fault threshold value:

[0185] Yes, record the number of times the vehicle end insulation exceeds the limit and perform the next step;

[0186] No, the vehicle end fault determination result is obtained as the vehicle insulation is normal and the insulation exceeds the limit number of times is cleared, and re-determined;

[0187] The insulation fault threshold value can be defined by the national standard or the vehicle manufacturer. According to the national standard, according to 500Ω / V and 100Ω / V, (V is the highest voltage) can set up slight insulation fault and serious insulation fault.

[0188] determining whether the number of times the vehicle end insulation exceeds the limit exceeds the vehicle end insulation fault threshold value:

[0189] Yes, the cloud end fault determination result is generated as an insulation abnormality warning and the vehicle insulation alarm light is lit;

[0190] No, the cloud end fault determination result is generated as no alarm, and whether the insulation detection start condition is met is re-determined and the vehicle end insulation resistance is re-acquired.

[0191] The vehicle end insulation fault threshold value can be determined according to different vehicle conditions. For example, in the condition of no external high-voltage equipment connection (driving condition), compared with the condition of having external high-voltage components connection (AC / DC charging, V2V, V2L, V2G condition, etc.), the system is relatively stable, and the threshold value can be lower than the condition of having external high-voltage components.

[0192] Third embodiment

[0193] Figure 3 A structural block diagram of a vehicle is provided for the third embodiment of the application, which includes a controller 210, a memory 220 and a vehicle end system 230; the number of controllers 210 in the vehicle can be one or more, Figure 3 for example, one controller 210; the controller 210, the memory 220 and the vehicle end system 230 in the vehicle can be connected through a bus or other means, Figure 3 for example, connected through a bus.

[0194] The memory 220 is a kind of computer readable storage medium, which can be used to store software programs, computer executable programs and modules. The controller 210 executes various functions of the vehicle and data processing by running the software programs, instructions and modules stored in the memory 220, that is, realizes the insulation detection method of the new energy electric vehicle cloud cooperation described above.

[0195] The memory 220 can include a program storage area and a data storage area. The program storage area can store an operating system, applications required for at least one function, and the like. The data storage area can store data created according to a use of the terminal, and the like. In addition, the memory 220 can include a high-speed random access memory, and can further include a nonvolatile memory such as at least one of a magnetic disk storage device, a flash memory device, or other nonvolatile solid state memory device. In some examples, the memory 220 can further include a memory remotely disposed with respect to the controller 210, and the remote memory can be connected to the vehicle through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0196] The vehicle end system 230 is configured to perform insulation detection of the power battery and the high-voltage contactor.

[0197] While embodiments of the present application have been disclosed in connection with the specified examples, it should be understood that it can be embodied in many other specific forms without departing from the spirit or central characteristics of the application. The present examples are therefore to be considered in all respects as illustrative and not restrictive, and the scope of the application should be determined not with reference to the above description but with reference to the appended claims, along with their full scope of equivalents.

Claims

1. An insulation detection system for a new energy electric vehicle with vehicle-cloud collaboration, comprising a vehicle-side system, the vehicle-side system including a first insulation resistor and a second insulation resistor, one end of which are respectively connected to the high-voltage positive terminal of a power battery, and a second insulation resistor and a fourth insulation resistor, one end of which are respectively connected to the high-voltage negative terminal of the power battery; the series connection point of the other ends of the first insulation resistor and the second insulation resistor is connected to the vehicle body ground; a second resistor and a third resistor are also connected in series between the first resistor and the fourth resistor; the series connection point between the second resistor and the third resistor is connected to the vehicle body ground; the series connection point of the first resistor and the second resistor is connected to one end of a high-voltage contactor; the other end of the high-voltage contactor is connected to the high-voltage negative terminal of the power battery; and the series connection point of the third resistor and the fourth resistor is connected to an AD sampling module, characterized in that... It also includes: a cloud system, which includes an insulation data feature library module and a cloud communication module that are electrically connected to the cloud control module respectively; the vehicle-side system also includes a voltage sampling module, a vehicle-side control module and a vehicle-side communication module that are electrically connected in sequence to the cloud communication module via a network; the voltage sampling module is electrically connected to the AD sampling module and the high voltage positive and negative terminals of the power battery respectively. The voltage sampling module is used to obtain the total voltage of the power battery under the current vehicle operating conditions, vehicle location information and vehicle working mode, and obtain the voltage value of the power battery negative terminal to the vehicle body ground when the high voltage contactor is opened or closed by the AD sampling module by the resistance value of the third resistor, the resistance value of the fourth resistor and the voltage value of the fourth resistor when the high voltage contactor is opened or closed. The vehicle-side control module is used to obtain the vehicle-side insulation resistance value based on the voltage value of the negative terminal of the power battery to the vehicle body ground, the first resistance value, the second resistance value, the third resistance value, the fourth resistance value, and the total voltage of the power battery when the high-voltage contactor is opened or closed, according to the current vehicle operating conditions, vehicle location information, and vehicle working mode. It then performs an insulation monitoring confidence judgment strategy and an insulation resistance value credibility judgment strategy on the module to obtain the vehicle-side insulation resistance value to be measured. It is also used to determine faults by measuring the insulation resistance value at the vehicle end, obtain fault determination results, and perform corresponding reporting processing, including: The vehicle-side communication module and the cloud-based communication module detect the validity and timing of communication data in real time to determine whether communication is normal. Yes, the current vehicle operating condition, vehicle location information, and vehicle working mode are respectively controlled to control the voltage value of the negative terminal of the power battery to the vehicle body ground when the high voltage contactor is opened or closed, as well as the insulation resistance value to be measured at the vehicle end, and sent to the cloud control module. No, the fault judgment result is obtained by measuring the insulation resistance value at the vehicle end and the corresponding reporting process is carried out. The insulation data feature library module is used to store the voltage relationship data model between the negative terminal of the power battery and the vehicle body ground when the control high-voltage contactor is disconnected or engaged under different vehicle operating conditions, different vehicle location information, and different vehicle working modes. The cloud control module is used to acquire the voltage value of the negative terminal of the power battery to the vehicle ground when the high-voltage contactor is opened or closed under the current vehicle operating condition, vehicle location information, and vehicle working mode, as sent by the vehicle-side control module. This voltage value is then matched with the data model in the insulation data feature library module to obtain the matching degree, and it is determined whether the matching degree exceeds the matching degree threshold of the insulation data feature library. Yes, the match was successful and the cloud insulation resistance value and the cloud insulation resistance value reliability were obtained. Proceed to the next step. No, a comprehensive analysis is performed on the voltage value between the negative terminal of the power battery and the vehicle ground when the high-voltage contactor is opened or closed, as sent by the vehicle-side control module. Determine whether the reliability of the stated cloud insulation resistance value is credible: Yes, proceed to the next step; No, the cloud-based insulation resistance value and the cloud-based insulation resistance value reliability are sent to the insulation data feature library module for storage, and the cloud-based fault judgment result obtained by tracking the data model in the insulation data feature library module is sent to the vehicle-side control module if the insulation interference warning is obtained. The insulation resistance value to be measured at the vehicle end is obtained, and the insulation resistance value to be measured at the cloud end is obtained through the insulation resistance value at the cloud end and the insulation resistance value to be measured at the vehicle end. Determine whether the insulation resistance value to be tested in the cloud exceeds the insulation fault threshold: Yes, record the number of times the insulation exceeds the limit in the cloud and proceed to the next step; No, if the cloud-based fault assessment result is that the vehicle insulation is normal and the number of insulation over-limit counts is reset to zero, then the assessment is repeated. Determine whether the number of times the cloud insulation exceeds the limit exceeds the threshold for the number of cloud insulation faults: Yes, the cloud-based fault judgment result is generated as an insulation abnormality warning and sent to the vehicle-side control module; No, the cloud-based fault assessment result is "no alarm," and the matching degree is reassessed. The vehicle-side control module is also used to obtain the cloud-based fault judgment results sent by the cloud-based control module and perform corresponding reporting processing.

2. The insulation detection system for new energy electric vehicles with cloud-based collaboration according to claim 1, characterized in that, The process of obtaining the cloud-based insulation resistance value and the vehicle-side insulation resistance value to be measured includes: Determine whether the ratio of the absolute value of the difference between the cloud insulation resistance value and the vehicle insulation resistance value to the larger of the cloud insulation resistance value and the vehicle insulation resistance value exceeds the percentage deviation threshold between the cloud insulation resistance value and the vehicle insulation resistance value: Yes, obtain the maturity of the insulation data feature library and proceed to the next step; No, the smaller of the cloud-based insulation resistance value and the vehicle-end insulation resistance value to be tested shall be the cloud-based insulation resistance value to be tested; Determine whether the maturity level of the insulation data feature library exceeds the insulation data feature library maturity threshold: Yes, the cloud insulation resistance value and the cloud insulation resistance value confidence level are sent to the insulation data feature library module for storage, and the cloud fault judgment result is generated by using the vehicle-side insulation resistance value to perform fault judgment to obtain the vehicle-side fault judgment result and perform corresponding reporting processing. No, set the cloud insulation resistance value to the cloud insulation resistance value to be measured, and proceed to the next step.

3. An insulation detection method for a new energy electric vehicle cloud-based collaborative system, applied to the insulation detection system for a new energy electric vehicle cloud-based collaborative system as described in claim 1 or 2, characterized in that, include: Determine whether the insulation test activation conditions are met; If so, under the current vehicle operating conditions, vehicle location information, and vehicle working mode, the vehicle-end insulation resistance value is obtained based on the voltage value of the negative terminal of the power battery to the vehicle body ground, the first resistance value, the second resistance value, the third resistance value, the fourth resistance value, and the total voltage of the power battery when the high-voltage contactor is opened or closed. The insulation monitoring confidence judgment strategy and the insulation resistance value credibility judgment strategy are then applied to obtain the vehicle-end insulation resistance value to be measured. The fault is determined by measuring the insulation resistance at the vehicle end, and the fault is reported accordingly.

4. The insulation detection method for a new energy electric vehicle with cloud-based collaboration according to claim 3, characterized in that, The determination of whether the insulation detection activation conditions are met includes: Determine whether the initialization of the insulation detection system for the new energy electric vehicle cloud collaboration is complete: Yes, proceed to the next step; No, continue to execute the initialization strategy of the insulation detection system for the new energy electric vehicle cloud collaboration and re-evaluate until completion; Determine if the diagnostic time for the high-voltage contactor's engagement or disengagement has been reached: Yes, proceed to the next step; No, continue to execute the high-voltage contactor engagement or disengagement action diagnosis strategy and re-perform the time judgment until completion; Determine if the delay time for external device access on the vehicle has elapsed: Yes, proceed to the next step; No, continue to execute the delay strategy for external device access on the vehicle and re-perform the time judgment until completion.

5. The insulation detection method for a new energy electric vehicle with cloud-based collaboration according to claim 4, characterized in that, The insulation monitoring confidence determination strategy includes: Under the current vehicle operating conditions, vehicle location information, and vehicle working mode, when the high-voltage contactor is controlled to be open, the voltage value of the negative terminal of the power battery to the vehicle body ground is obtained 1 second after the high-voltage contactor is opened, the voltage value of the negative terminal of the power battery to the vehicle body ground is obtained n seconds after the high-voltage contactor is opened, and the voltage value of the negative terminal of the power battery to the vehicle body ground is obtained X seconds after the high-voltage contactor is opened, where: n=2...X-1; Under the current vehicle operating conditions, vehicle location information, and vehicle working mode, when the high-voltage contactor is controlled to be engaged, the voltage value of the negative terminal of the power battery to the vehicle body ground is obtained 1 second after the high-voltage contactor is engaged, the voltage value of the negative terminal of the power battery to the vehicle body ground is obtained n seconds after the high-voltage contactor is engaged, and the voltage value of the negative terminal of the power battery to the vehicle body ground is obtained X seconds after the high-voltage contactor is engaged. When the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is disconnected is less than the voltage value of the negative terminal of the power battery to the vehicle ground 2 seconds after the high-voltage contactor is disconnected, and less than the voltage value of the negative terminal of the power battery to the vehicle ground 3 seconds after the high-voltage contactor is disconnected, it includes: When the voltage value of the negative terminal of the power battery to the vehicle body ground 1 second after the high-voltage contactor is engaged > the voltage value of the negative terminal of the power battery to the vehicle body ground 2 seconds after the high-voltage contactor is engaged > the voltage value of the negative terminal of the power battery to the vehicle body ground 3 seconds after the high-voltage contactor is engaged, the insulation monitoring confidence level is A. When the voltage value of the negative terminal of the power battery to the vehicle body ground 1 second after the high-voltage contactor is < the voltage value of the negative terminal of the power battery to the vehicle body ground 2 seconds after the high-voltage contactor is 2 seconds after it ... When the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged is greater than the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged, and the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged is greater than the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged, and the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged is less than the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged, and the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged, and the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged, and the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged is less than ... the insulation monitoring confidence level is C. When the voltage between the negative terminal of the power battery and the vehicle ground is greater than the voltage between the negative terminal of the power battery and the vehicle ground at the nth second after the high-voltage contactor is disconnected, and greater than the voltage between the negative terminal of the power battery and the vehicle ground at the Xth second after the high-voltage contactor is disconnected: Determine whether the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged is greater than the voltage value of the negative terminal of the power battery to the vehicle ground 2 seconds after the high-voltage contactor is engaged, which is greater than the voltage value of the negative terminal of the power battery to the vehicle ground 3 seconds after the high-voltage contactor is engaged. Yes, the confidence level for insulation monitoring is B; No, the confidence level for insulation monitoring is D; When the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is disconnected > the voltage value of the negative terminal of the power battery to the vehicle ground 2 seconds after the high-voltage contactor is disconnected & the voltage value of the negative terminal of the power battery to the vehicle ground 2 seconds after the high-voltage contactor is disconnected > the voltage value of the negative terminal of the power battery to the vehicle ground 2 seconds after the high-voltage contactor is disconnected: Determine whether the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged is greater than the voltage value of the negative terminal of the power battery to the vehicle ground 2 seconds after the high-voltage contactor is engaged, which is greater than the voltage value of the negative terminal of the power battery to the vehicle ground 3 seconds after the high-voltage contactor is engaged. Yes, the confidence level for insulation monitoring is C; No, the confidence level for insulation monitoring is D; When the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is disconnected is less than the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is disconnected, and the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is disconnected is less than the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is disconnected: Determine whether the voltage value of the negative terminal of the power battery to the vehicle ground 1 second after the high-voltage contactor is engaged is greater than the voltage value of the negative terminal of the power battery to the vehicle ground 2 seconds after the high-voltage contactor is engaged, which is greater than the voltage value of the negative terminal of the power battery to the vehicle ground 3 seconds after the high-voltage contactor is engaged. Yes, the confidence level for insulation monitoring is C; No, the confidence level for insulation monitoring is D.

6. The insulation detection method for a new energy electric vehicle with cloud-based collaboration according to claim 5, characterized in that, The insulation resistance value reliability determination strategy includes: Given the current vehicle operating conditions, vehicle location information, and vehicle working mode, the first and second insulation monitoring confidence levels obtained from the insulation monitoring confidence level determination strategies are acquired twice. When the confidence level of the first insulation monitoring is A or B and the confidence level of the second insulation monitoring is A, the vehicle-end insulation resistance value is reliable, the count of unreliable insulation resistance values ​​is cleared to zero, and the vehicle-end insulation resistance value is the vehicle-end insulation resistance value to be measured. When the confidence level of the first insulation monitoring is C or D and the confidence level of the second insulation monitoring is A, or when the confidence level of the first insulation monitoring is A, B, C or D and the confidence level of the second insulation monitoring is B, an accurate judgment cannot be made. The confidence level of the insulation monitoring is then obtained again under the current vehicle operating conditions, vehicle location information and vehicle operating mode. The new first insulation monitoring confidence level, which is the second insulation monitoring confidence level, will be used for the next judgment. The new second insulation monitoring confidence level will then be obtained again for the judgment. When the confidence level of the first insulation monitoring is A, B, C, or D, and when the confidence level of the second insulation monitoring is both C or D, the insulation resistance value at the vehicle end is considered unreliable. The count of unreliable insulation resistance values ​​is incremented by 1, and it is determined whether it is greater than the external interference threshold for insulation. Yes, the vehicle-side fault judgment result is that the vehicle's high-voltage system is in an unstable state, with continuous external interference, and corresponding reporting and processing are performed. No, re-evaluate whether the insulation detection activation conditions are met and re-acquire the vehicle-end insulation resistance value.

7. The insulation detection method for a new energy electric vehicle with cloud-based collaboration according to claim 6, characterized in that, The process of obtaining a fault judgment result by measuring the insulation resistance value at the vehicle end and then reporting it accordingly includes: The vehicle-side communication module and the cloud-based communication module detect the validity and timing of communication data in real time to determine whether communication is normal. Yes, the current vehicle operating condition, vehicle location information, and vehicle working mode are respectively controlled to open or close the high-voltage contactor. The voltage value of the negative terminal of the power battery to the vehicle body ground and the insulation resistance value to be measured at the vehicle end are sent to the cloud control module. The cloud fault judgment result sent by the cloud control module is obtained and corresponding reporting processing is performed. No, the fault judgment result is obtained by measuring the insulation resistance value at the vehicle end and then reported accordingly, including: Determine whether the insulation resistance value to be tested at the vehicle end exceeds the insulation fault threshold: Yes, record the number of times the vehicle-end insulation exceeds the limit and proceed to the next step; No, the vehicle-side fault judgment result is that the overall vehicle insulation is normal and the number of insulation over-limit counts is cleared to zero, and the judgment is repeated; Determine whether the number of times the vehicle-end insulation exceeds the limit exceeds the threshold for the number of vehicle-end insulation faults: Yes, the cloud-based fault judgment result is generated as an insulation abnormality warning and reported, and the vehicle's insulation alarm light is illuminated. No, the cloud-based fault judgment result is no alarm, and a new judgment is made to determine whether the insulation detection activation conditions are met and the vehicle-end insulation resistance value is obtained again.

8. A vehicle comprising: The vehicle-mounted system, processor, and memory communicatively connected to the processor as described in claim 1 or 2; The vehicle-end system is used for insulation detection of the power battery and high-voltage contactor; The memory stores computer-executed instructions; The processor executes the computer execution instructions stored in the memory to implement the insulation detection method for new energy electric vehicles in cloud collaboration as described in any one of claims 3-7.

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