CN114355113B - Charging/driving insulation failure positioning detection method and device based on time sequence control - Google Patents
Charging/driving insulation failure positioning detection method and device based on time sequence control Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 242
- 238000001514 detection method Methods 0.000 title claims abstract description 63
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims description 23
- 238000010257 thawing Methods 0.000 claims description 15
- 238000005485 electric heating Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 description 7
- 238000004378 air conditioning Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
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- 230000032683 aging Effects 0.000 description 1
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- 239000000446 fuel Substances 0.000 description 1
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Abstract
The invention relates to a charging/driving insulation failure positioning detection method and device based on time sequence control, wherein the charging insulation failure positioning detection method comprises the following steps: when charging is started, insulation detection is started; if the insulation alarm exists, positioning the insulation failure of the battery system, if the insulation alarm does not exist, closing the heating relay, and continuing to perform insulation detection; if the insulation alarm exists, positioning the insulation failure of the battery heating system, if the insulation alarm does not exist, closing the direct current charging relay, and continuing to perform insulation detection; if the insulation alarm exists, the insulation failure of the charging system is positioned, and if the insulation alarm does not exist, the charging is performed. The invention can realize the electric leakage detection of each part of the high-voltage electric system of the electric vehicle, accurately position the insulation failure point, and take different protective measures according to the severity of the fault and the severity of the fault part on the whole vehicle, thereby ensuring the safety of personnel and the whole vehicle resources, avoiding the occurrence of safety accidents, improving the problem solving efficiency and improving the customer satisfaction.
Description
Technical Field
The invention relates to a charging/driving insulation failure positioning detection method and device based on time sequence control.
Background
Automobiles are an important vehicle in modern society. However, the great amount of applications of the fuel automobiles cause serious environmental pollution, global warming and human survival crisis, the cultivation and development of energy-saving automobiles and new energy automobiles are quickened, the energy and environmental pressure can be effectively relieved, the urgent task of sustainable development of the automobile industry is also promoted, and in recent years, the new energy industry has greatly developed by virtue of the advantages of the new energy industry and the support of government regulations and patch policies.
The high-voltage system of the electric vehicle consists of a power part, a driving part and relevant accessories of the whole vehicle. The insulation protection and effective detection and management of the high-voltage system are directly related to the life safety of drivers and passengers and the safety of whole vehicle resources, so ensuring the safety of the electric vehicle is the first task that a designer must consider. The working environment of the high-voltage system of the electric vehicle is complex and severe, the insulation condition of the whole vehicle is directly affected by factors such as temperature, service life aging of devices and the like, phenomena such as mutual collision, friction, extrusion and the like among parts often occur in the running process of the vehicle, damage to a protective insulation layer can be caused, phenomena such as bonding and the like occur between a wiring terminal and surrounding metals, and electric leakage of the high-voltage system is caused.
In order to ensure the safety of the high-voltage system of the electric vehicle, an insulation detection device is generally installed on the whole vehicle, and when the insulation failure of the high-voltage system of the whole vehicle is detected, the whole vehicle is required to stop so as to ensure the safety of the system, and no matter the terminal voltage detection principle or the low-frequency signal injection detection principle of the insulation detection system adopted in the current industry, only the leakage of the high-voltage system can be judged, and the specific failure part and failure position of the high-voltage system cannot be accurately positioned. The insulation failure part cannot be positioned, different protection measures cannot be adopted according to the importance degree of the part, the vehicle is stopped when the insulation problem is encountered, the reliability of the vehicle and the customer satisfaction degree are seriously influenced, and meanwhile after-sales service personnel check the insulation failure point without starting, so that the problem solving time is long, and the efficiency is low.
Disclosure of Invention
The purpose of the application is to provide a charging/driving insulation failure positioning detection method and device based on time sequence control, which are used for solving the problem that insulation positioning cannot be performed in the prior art.
In order to achieve the above object, the present invention provides a method for positioning and detecting a charging insulation failure based on time sequence control, comprising: when charging is started, insulation detection is started; if the insulation alarm exists, positioning the insulation failure of the battery system, if the insulation alarm does not exist, closing the heating relay, and continuing to perform insulation detection; if the insulation alarm exists, positioning the insulation failure of the battery heating system, if the insulation alarm does not exist, closing the direct current charging relay, and continuing to perform insulation detection; if the insulation alarm exists, the insulation failure of the charging system is positioned, and if the insulation alarm does not exist, the charging is performed.
Further, insulation detection is continuously performed in the charging process; if the insulation alarm exists, the direct current charging relay is disconnected; if the insulation alarm is eliminated, positioning the insulation failure of the charging system, and if the insulation alarm is not eliminated, disconnecting the heating relay; if the insulation alarm is eliminated, the insulation failure of the battery heating system is positioned, and if the insulation alarm is not eliminated, the insulation failure of the battery system is positioned.
Further, the battery management and insulation detection system controls the heating relay and the direct current charging relay.
The invention also provides a driving insulation failure positioning detection method based on time sequence control, which comprises the following steps: when the driving state starts, starting to perform insulation detection; if the insulation alarm exists, positioning the insulation failure of the battery system, if the insulation alarm does not exist, closing the heating relay, and continuing to perform insulation detection; if the insulation alarm exists, positioning the insulation failure of the battery heating system, and if the insulation alarm does not exist, closing the main loop relay, and continuing to perform insulation detection; if the insulation alarm exists, the insulation failure of the motor and the control system is positioned, if the insulation alarm does not exist, the relays of all accessories are sequentially closed, and if the insulation alarm exists when the relay of one accessory is closed, the insulation failure of the accessory exists; if the relays of all accessories are closed and no insulation alarm exists, the driving process is started.
Further, insulation monitoring is continuously carried out in the driving process; if the insulation alarm exists, the main loop relay is disconnected; if the insulation alarm is eliminated, positioning the insulation failure of the motor and the control system, if the insulation alarm is not eliminated, sequentially switching off the relays of all accessories, and if the insulation alarm is eliminated when the relay of one accessory is switched off, positioning the insulation failure of the accessory; if the insulation alarm is not eliminated after the relays of all accessories are disconnected, the heating relay is disconnected; if the insulation alarm is eliminated, the insulation failure of the battery heating system is positioned, and if the insulation alarm is not eliminated, the insulation failure of the battery system is positioned.
Further, the sequence of closing the relays of each accessory is: an electric defrosting relay, an electric heating relay, an electric steering relay, an air compressor relay, a DC/DC relay and an electric air conditioner relay.
Further, the sequence of opening the relays of each accessory is: an electric defrosting relay, an electric heating relay, an electric steering relay, an air compressor relay, a DC/DC relay and an electric air conditioner relay.
Further, the battery management and insulation detection system controls the heating relay and the direct-current charging relay; and the integrated controller controls the main loop relay and the relays of all accessories.
The invention also provides a charging/driving insulation failure positioning detection device based on time sequence control, which comprises a processor and a memory, wherein the processor is used for executing a computer program stored in the memory so as to realize the method.
The beneficial effects of the invention are as follows: the electric leakage detection can be carried out on each part of the high-voltage electric system of the electric vehicle, the insulation failure point is accurately positioned, different protection measures are adopted according to the severity of the fault and the severity of the fault part on the whole vehicle, the safety of personnel and the whole vehicle resource is ensured, the occurrence of safety accidents is avoided, the problem solving efficiency is improved, and the customer satisfaction is improved.
Drawings
Fig. 1 is a schematic diagram of a high voltage electrical system of an electric vehicle according to an embodiment of the present invention;
FIG. 2 is a flow chart of insulation detection during charging according to an embodiment of the present invention;
FIG. 3 is a flow chart of insulation detection at power-up in accordance with the present invention;
fig. 4 is a flow chart of insulation detection during driving of the present invention.
Detailed Description
The electric automobile high-voltage system mainly includes: power battery systems, battery high voltage power distribution systems, and whole vehicle high voltage power distribution systems, as described in fig. 1.
The power battery system mainly comprises a single battery box body which is connected in series and parallel to form a power source for providing energy for the whole vehicle. The power battery system also comprises a battery heating system which is formed by connecting battery packs in series and parallel and is controlled by a heating relay (positive/negative).
The battery high-voltage power distribution system is connected between the power battery system and the whole vehicle high-voltage power distribution system and mainly comprises a direct-current charging relay (positive/negative), a heating relay (positive/negative) and related circuits; the direct current charging relay (positive/negative) controls to charge the power battery, and the heating relay (positive/negative) controls to heat the power battery.
The whole vehicle high-voltage power distribution system comprises a driving system and an accessory system, wherein the driving system comprises a driving motor and a control system thereof, the accessory system mainly comprises an electric defrosting system, an electric heating system, a steering system, an air compressor system, an electric air conditioner and a DC/DC, and the whole vehicle driving system and the accessory system are connected with a main loop relay in series at the output; relays are respectively arranged on the accessories.
In this embodiment, the battery management and insulation detection system controls the heating relay and the dc charging relay; and the integrated controller controls the main loop relay and the relays of all accessories.
The method for detecting the insulation failure of the electric automobile based on time sequence control is divided into insulation failure positioning in a charging state and insulation failure positioning in a driving state, and is introduced as follows:
state of charge
In the charged state of the electric vehicle, the driving system and accessories thereof do not work, and the related relays are in the disconnected state. As shown in fig. 2, when the gun is charged, the charger supplies voltage to the battery management and insulation detection system, and the system starts to work. The system detects that the charging state is entered, and an insulation detection function is started: if the insulation alarm exists, the insulation failure of the battery system is positioned, charging is not performed, and if the insulation alarm does not exist, the battery management and insulation detection system closes the heating positive relay and the heating negative relay, and insulation detection is performed. If the insulation alarm exists, the battery is positioned to be invalid in heating insulation, and charging is not performed any more, if the alarm does not exist, the direct current charging positive relay and the direct current charging negative relay are closed, and insulation detection is continued. If the insulation alarm exists, the insulation failure of the charging system is positioned, the charging is not performed, and if the alarm does not exist, the charging process is normally started.
In the charging process, the battery management and insulation detection system continuously performs insulation detection, when insulation alarm occurs, the charging process is stopped, the high-voltage and accessory system is disconnected according to the time sequence, the direct-current charging positive relay and the direct-current charging negative relay are disconnected firstly, if the insulation alarm continuously exists, the insulation fault of the charging system is eliminated, and if the insulation alarm is eliminated, the insulation fault of the charging system is positioned; and then disconnecting the heating positive relay and the heating negative relay, if the insulation alarm is continuously present, removing the insulation fault of the heating system, positioning the insulation fault of the battery system, and if the insulation alarm is eliminated, positioning the insulation fault of the battery heating system.
Running state
In the running state of the electric automobile, the charging system does not work, and the related relay is in a disconnected state. As shown in fig. 3, in the driving state, the whole vehicle storage battery supplies voltage to the battery management and insulation detection system, the system starts to work, and the insulation detection function is started: if the insulation alarm exists, positioning the insulation failure of the battery system, and reminding a driver of the requirement of stopping the whole vehicle; if the insulation alarm is not available, the battery management and insulation detection system closes the heating positive relay and the heating negative relay to continuously perform insulation detection, and if the insulation alarm is available, the insulation failure of the battery heating system is positioned; if the insulation alarm is not given, the integrated controller closes the main loop positive relay and the main loop negative relay, and if the insulation alarm is given, the insulation failure of the positioning motor and the control system thereof is caused, and the driver is reminded of the requirement of stopping the whole vehicle; if the insulation alarm is not available, the integrated controller closes the electric defrosting positive relay and the electric defrosting negative relay to continuously perform insulation detection, and if the insulation alarm is available, positioning the electric defrosting insulation failure and reminding a driver to return to a factory for maintenance; if no insulation alarm exists, the integrated controller closes the electric heating positive relay and the electric heating negative relay, insulation detection is continuously carried out, and if an alarm exists, the electric heating insulation failure is positioned; if no insulation alarm exists, the integrated controller closes the steering positive relay and the steering negative relay, insulation detection is continuously carried out, if the alarm exists, the insulation failure of the steering system is positioned, and a driver is reminded of the requirement of the whole vehicle to stop; if no insulation fault exists, the integrated controller closes the air compressor positive relay and the air compressor negative relay, insulation detection is continuously carried out, and if insulation alarm exists, the air compressor insulation failure is positioned, and a driver is reminded that the whole vehicle is required to stop; if the insulation alarm is not given, the integrated controller closes the DC/DC positive relay and the DC/DC negative relay, insulation detection is continuously carried out, and if the insulation alarm is given, the DC/DC insulation failure is positioned, and a driver is reminded to return to a factory for maintenance; if the insulation alarm is not available, the integrated controller closes the electric air conditioner positive relay and the electric air conditioner negative relay, if the insulation alarm is available, the insulation failure of the electric air conditioner is positioned, and a driver is reminded to return to the factory for maintenance; if no insulation fault exists, the system is intact and enters a driving state.
As shown in fig. 4, insulation detection is continuously performed in the driving process, and if an insulation fault occurs, the high-voltage driving system and the accessory system need to be disconnected based on time sequence, so that an insulation failure point is positioned. The integrated controller firstly disconnects the main loop relay and the main loop negative relay, if the alarm is eliminated, the insulation failure of the positioning motor and the control system of the positioning motor is avoided, and a driver is reminded of the requirement of stopping the whole vehicle; if the insulation alarm is continuously present, eliminating insulation failure of the motor and the control system, continuously switching off the electric defrosting positive relay and the electric defrosting negative relay by the integrated controller, positioning the insulation failure of the electric defrosting system if the alarm is eliminated, and reminding a driver to return to a factory for maintenance; if the insulation alarm is continuously present, eliminating insulation failure of the electric defrosting system, continuously switching off the electric heating positive relay and the electric heating negative relay by the integrated controller, positioning the insulation failure of the electric defrosting system if the alarm is eliminated, and reminding a driver to return to a factory for maintenance; if the insulation alarm is continuously present, eliminating insulation failure of the electric defrosting system, continuously disconnecting the steering positive relay and the steering negative relay by the integrated controller, positioning the insulation failure of the steering system if the alarm is eliminated, and reminding a driver of the requirement of stopping the whole vehicle; if the insulation alarm is continuously present, eliminating the insulation failure of the steering system, continuously disconnecting the positive relay of the air compressor and the negative relay of the air compressor by the integrated controller, and if the alarm is eliminated, positioning the insulation failure of the air compressor system and reminding a driver of the requirement of stopping the whole vehicle; if the insulation alarm is continuously present, eliminating insulation failure of the air compressor system, continuously switching off the DC/DC positive and negative relay by the integrated controller, positioning the insulation failure of the DC/DC system if the alarm is eliminated, and reminding a driver to return to a factory for maintenance; if the insulation alarm is continuously present, eliminating insulation failure of the DC/DC system, continuously switching off the positive and negative relays of the electric air conditioner by the integrated controller, positioning the insulation failure of the electric air conditioner system if the alarm is eliminated, and reminding a driver to return to a factory for maintenance; if the insulation alarm exists continuously, eliminating insulation failure of the electric air conditioning system; at the moment, the insulation failure of the whole vehicle driving system and the electric attachment thereof is eliminated. Continuously judging an insulation failure point based on the time sequence, disconnecting the heating positive and negative relays by the battery management system, positioning the insulation failure of the battery heating system if the alarm is eliminated, and reminding a driver to repair the battery heating system after the battery heating system returns to a factory; if the insulation alarm exists continuously, the insulation failure of the battery heating system is eliminated, the insulation failure of the battery system is finally judged, and a driver is reminded of the requirement of stopping the whole vehicle.
In summary, in the charged state (i.e., when charging is started), the timing of the operation is: battery system → battery heating system → charging system.
In the charging process, the timing of the exit operation is: charging system→heating system→battery system.
In the driving state (i.e., when driving is started), the time sequence of the input operation is as follows: battery system, battery heating system, motor and control system, accessory system (including electric defrosting system, electric heating system, electric steering system, air compressor system, DC/DC system, electric air conditioning system), the order among these accessories can be adjusted.
In the driving process, the time sequence of the exit work is as follows: motor and control system → accessory system → battery heating system → battery system.
The invention can realize the electric leakage detection of each part of the high-voltage electric system of the electric vehicle and accurately position the insulation failure point. The safety of personnel and whole vehicle resources is ensured, safety accidents are avoided, meanwhile, the problem solving efficiency is improved, and the customer satisfaction is improved; time sequence control and insulation detection under different states can be realized, and insulation failure points can be accurately positioned; according to the insulation failure position and the failure severity, different treatment modes can be formulated, the personnel and whole vehicle resource safety is ensured, the occurrence of safety accidents is avoided, and meanwhile, the problem solving efficiency is improved.
Regarding the electric automobile insulation failure positioning detection device based on time sequence control, in practice, the combination of related software and hardware for realizing the method is realized, the hardware mainly comprises various related relays, a processor and a memory, the software comprises a computer program stored in the memory, and the method can be realized when the processor executes.
Claims (9)
1. The charging insulation failure positioning detection method based on time sequence control is characterized by comprising the following steps of: when charging is started, insulation detection is started; if the insulation alarm exists, the insulation failure of the battery system is positioned, charging is not performed, and if the insulation alarm does not exist, the heating relay is closed, and insulation detection is continued; if the insulation alarm exists, positioning the insulation failure of the battery heating system, not charging, if the insulation alarm does not exist, closing the direct current charging relay, and continuing to perform insulation detection; if the insulation alarm exists, the insulation failure of the charging system is positioned, the charging is not performed, and if the insulation alarm does not exist, the charging is performed.
2. The method for positioning and detecting a charging insulation failure based on time sequence control according to claim 1, wherein insulation detection is continuously performed during charging; if the insulation alarm exists, the direct current charging relay is disconnected; if the insulation alarm is eliminated, positioning the insulation failure of the charging system, and if the insulation alarm is not eliminated, disconnecting the heating relay; if the insulation alarm is eliminated, the insulation failure of the battery heating system is positioned, and if the insulation alarm is not eliminated, the insulation failure of the battery system is positioned.
3. The method for positioning and detecting a charging insulation failure based on time sequence control according to claim 2, wherein a battery management and insulation detection system controls the heating relay and the direct current charging relay.
4. The driving insulation failure positioning detection method based on time sequence control is characterized by comprising the following steps of: when the driving state starts, starting to perform insulation detection; if the insulation alarm exists, positioning the insulation failure of the battery system, if the insulation alarm does not exist, closing the heating relay, and continuing to perform insulation detection; if the insulation alarm exists, positioning the insulation failure of the battery heating system, and if the insulation alarm does not exist, closing the main loop relay, and continuing to perform insulation detection; if the insulation alarm exists, the insulation failure of the motor and the control system is positioned, if the insulation alarm does not exist, the relays of all accessories are sequentially closed, and if the insulation alarm exists when the relay of one accessory is closed, the insulation failure of the accessory exists; if the relays of all accessories are closed and no insulation alarm exists, the driving process is started.
5. The method for positioning and detecting insulation failure of a traveling crane based on time sequence control according to claim 4, wherein insulation monitoring is continuously performed during traveling; if the insulation alarm exists, the main loop relay is disconnected; if the insulation alarm is eliminated, positioning the insulation failure of the motor and the control system, if the insulation alarm is not eliminated, sequentially switching off the relays of all accessories, and if the insulation alarm is eliminated when the relay of one accessory is switched off, positioning the insulation failure of the accessory; if the insulation alarm is not eliminated after the relays of all accessories are disconnected, the heating relay is disconnected; if the insulation alarm is eliminated, the insulation failure of the battery heating system is positioned, and if the insulation alarm is not eliminated, the insulation failure of the battery system is positioned.
6. The method for detecting insulation failure positioning of a traveling crane based on time sequence control according to claim 4, wherein the sequence of closing the relays of each accessory is: an electric defrosting relay, an electric heating relay, an electric steering relay, an air compressor relay, a DC/DC relay and an electric air conditioner relay.
7. The method for detecting insulation failure positioning of a traveling crane based on time sequence control according to claim 5, wherein the sequence of turning off the relays of the accessories is: an electric defrosting relay, an electric heating relay, an electric steering relay, an air compressor relay, a DC/DC relay and an electric air conditioner relay.
8. The method for positioning and detecting a charging insulation failure based on time sequence control according to claim 5, wherein a battery management and insulation detection system controls the heating relay and the direct current charging relay; and the integrated controller controls the main loop relay and the relays of all accessories.
9. A charging/driving insulation failure positioning detection device based on time sequence control, characterized by comprising a processor and a memory, wherein the processor is configured to execute a computer program stored in the memory, so as to implement the method according to any one of the preceding claims 1-8.
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