CN111376751A - Vehicle charging management method and system - Google Patents
Vehicle charging management method and system Download PDFInfo
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- CN111376751A CN111376751A CN201811647317.9A CN201811647317A CN111376751A CN 111376751 A CN111376751 A CN 111376751A CN 201811647317 A CN201811647317 A CN 201811647317A CN 111376751 A CN111376751 A CN 111376751A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention relates to the field of charging of new energy automobiles, and provides a vehicle charging management method, which comprises the following steps: acquiring the heating temperature of the thermistor; judging whether the heating temperature exceeds a preset pre-over-temperature threshold value or not, wherein the pre-over-temperature threshold value is lower than a protection temperature threshold value of the thermistor; if the heating temperature exceeds the pre-over-temperature threshold value, calculating the corresponding target charging pile supply power when the thermistor is disconnected; and controlling the charging pile to charge the vehicle according to the power supplied by the target charging pile. Therefore, compared with the situation that the thermistor is disconnected due to the PTC characteristic and the calculation is triggered passively, the method and the device reserve the reaction time for the energy management system and the charging pile actively, avoid the situation of battery overcharge or charging spontaneous combustion when the thermistor is disconnected, and improve the safety and reliability of charging of the whole vehicle.
Description
Technical Field
The invention relates to the technical field of new energy automobile charging, in particular to a vehicle charging management method and system.
Background
The new energy automobile is the development trend of future automobiles, the pure electric automobile is one of the most rapidly developed automobile types in the new energy automobile, factors for restricting the development of the electric automobile are many, the most important point is the cruising ability of the electric automobile, and in order to solve the problem, part of the electric automobiles can carry an energy management system to realize power management of a whole automobile circuit.
In the heating mode of the current new energy automobile, a thermosensitive (or PTC) resistance heating mode and a heat pump heating mode are the mainstream. In a new energy automobile with a thermistor heating mode, the PTC has a protection temperature threshold due to the characteristics of the PTC, and the thermistor is automatically disconnected when a protection temperature point is reached.
The inventor of the present application finds in the course of practicing the present application that at least the following problems exist in the related art at present: when the whole vehicle circuit is charged, the energy management system needs to calculate the power required by the charging of the whole vehicle in advance and further requests corresponding power supply to the charging pile, and when the PTC resistor is automatically disconnected due to temperature protection, the energy management system needs to calculate the power supplied by the charging pile again to eliminate the power share originally distributed to the PTC resistor, and changes the power supply required by the charging pile according to the recalculated power supply; however, the process of recalculating and requesting power supply requires a reaction time during which the battery may be overcharged during power management due to the fact that the power is supplied according to the power supplied as it is; even if the energy management system does not react timely, the situation of spontaneous combustion of charging may occur, and a great potential safety hazard exists.
Disclosure of Invention
In view of the above, the present invention is directed to a method for managing vehicle charging, so as to at least solve the problem in the related art that the safety performance of the vehicle charging is affected due to the overcharge of the battery within the reaction time after the PTC resistor is disconnected.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle charge management method in which a thermistor is provided in a vehicle and the vehicle is connected to a charging post for charging, wherein the vehicle charge management method comprises: acquiring the heating temperature of the thermistor; judging whether the heating temperature exceeds a preset pre-over-temperature threshold value or not, wherein the pre-over-temperature threshold value is lower than a protection temperature threshold value of the thermistor; if the heating temperature exceeds the pre-over-temperature threshold value, calculating the corresponding target charging pile supply power when the thermistor is disconnected; and controlling the charging pile to charge the vehicle according to the power supplied by the target charging pile.
Further, the controlling the charging pile to charge the vehicle according to the power supplied by the target charging pile includes: transmitting a charging pile supply request corresponding to the target charging pile supply power to the charging pile so that the charging pile supplies the vehicle with the electric power of the target charging pile supply power in response to the charging request.
Further, if the heating temperature exceeds the pre-over-temperature threshold, calculating the corresponding target charging pile power supply when the thermistor is disconnected includes: if the heating temperature exceeds the pre-over-temperature threshold, acquiring the heating power distributed to the thermistor under the current working condition; acquiring the current charging pile supply power corresponding to the current working condition; and determining the supply power of the target charging pile based on the current charging pile supply power and the heating power.
Further, the vehicle includes an in-vehicle air conditioner, wherein the thermistor is provided in the in-vehicle air conditioner.
Compared with the prior art, the vehicle charging management method has the following advantages:
according to the vehicle charging management method, the heating temperature of the thermistor is compared with the pre-over-temperature threshold value which is smaller than the protection temperature threshold value, and when the heating temperature exceeds the pre-over-temperature threshold value, the corresponding target charging pile supply power or the vehicle required power when the thermistor is disconnected is actively calculated, so that the charging piles are controlled to charge the vehicle according to the calculated target charging pile supply power. Therefore, compared with the situation that the thermistor is disconnected due to the PTC characteristic and the calculation is triggered passively, the method and the device reserve the reaction time for the energy management system and the charging pile actively, avoid the situation of battery overcharge or charging spontaneous combustion when the thermistor is disconnected, and improve the safety and reliability of charging of the whole vehicle.
Another objective of the present invention is to provide a vehicle charging management method to at least solve the problem in the related art that the charging safety performance of the vehicle is affected due to the overcharge of the battery within the reaction time after the PTC resistor is disconnected.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle charge management method in which a thermistor and an energy management system are provided in a vehicle, and the vehicle is connected to a charging post for charging, wherein the vehicle charge management method comprises: detecting the heating temperature of the thermistor; judging whether the heating temperature exceeds a preset pre-over-temperature threshold value or not, wherein the pre-over-temperature threshold value is lower than a protection temperature threshold value of the thermistor; and if the heating temperature exceeds the pre-over-temperature threshold value, sending a zero heating power request to the energy management system, so that the energy management system calculates the corresponding target charging pile supply power when the thermistor is disconnected.
Further, after sending a zero heating power request to the energy management system if the heating temperature exceeds the pre-over-temperature threshold, the vehicle charging management method further includes: re-detecting the heating temperature of the thermistor; restarting the thermistor when the re-detected heating temperature falls below a PTC restart temperature, wherein the PTC restart temperature is less than the pre-over-temperature threshold.
Compared with the prior art, the vehicle charging management method has the following advantages:
according to the vehicle charging management method, when the temperature of the thermistor is detected to be reduced to the pre-over-temperature threshold value lower than the protection temperature threshold value, the zero heating power request is sent to the energy management system, so that the energy management system is ready to not actively distribute power for the thermistor before PTC protection is triggered, reaction time is reserved for the charging pile and the energy management system when the working condition of disconnection of the thermistor is processed, the situation of battery overcharge or charging spontaneous combustion when disconnection of the thermistor is avoided, and the safety and reliability of vehicle charging are improved.
An objective of the present invention is to provide a vehicle charging management system to at least solve the problem in the related art that the charging safety performance of the vehicle is affected by the battery overcharge within the reaction time after the PTC resistor is disconnected.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle charge management system in which a thermistor is provided in a vehicle and the vehicle is connected to a charging post for charging, wherein the vehicle charge management system comprises: a thermistor temperature acquisition unit for acquiring a heating temperature of the thermistor; the pre-over-temperature judging unit is used for judging whether the heating temperature exceeds a preset pre-over-temperature threshold value or not, wherein the pre-over-temperature threshold value is lower than a protection temperature threshold value of the thermistor; the target charging power calculation unit is used for calculating the corresponding target charging pile supply power when the thermistor is disconnected if the heating temperature exceeds the pre-over-temperature threshold; and the charging control unit is used for controlling the charging pile to charge the vehicle according to the power supplied by the target charging pile.
Further, the target charging power calculation unit includes: the current heating power acquisition module is used for acquiring the heating power distributed to the thermistor under the current working condition if the heating temperature exceeds the pre-over-temperature threshold value; the current charging pile power acquisition module is used for acquiring the current charging pile supply power corresponding to the current working condition; and the target charging pile power determining module is used for determining the supply power of the target charging pile based on the current charging pile supply power and the heating power.
Another objective of the present invention is to provide a vehicle charging management system to at least solve the problem of the related art that the charging safety performance of the vehicle is affected due to the battery overcharge within the reaction time after the PTC resistor is disconnected.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle charge management system in which a thermistor and an energy management system are provided and which is connected to a charging post for charging, wherein the vehicle charge management system comprises: a temperature detection unit for detecting a heating temperature of the thermistor; the temperature judging unit is used for judging whether the heating temperature exceeds a preset pre-over-temperature threshold value or not, wherein the pre-over-temperature threshold value is lower than a protection temperature threshold value of the thermistor; and the zero power request sending unit is used for sending a zero heating power request to the energy management system if the heating temperature exceeds the pre-over-temperature threshold value, so that the energy management system calculates the power supplied by the corresponding target charging pile when the thermistor is disconnected.
Further, the vehicle charge management system further includes a PTC restart unit for re-detecting a heating temperature of the thermistor, and restarting the thermistor when the re-detected heating temperature falls below a PTC restart temperature, which is less than the pre-over-temperature threshold value.
Compared with the prior art, the vehicle charging management system and the vehicle charging management method have the same advantages, and are not repeated herein.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a flowchart of a vehicle charge management method according to an embodiment of the invention;
FIG. 2 is a flow chart of a vehicle charging management method according to another embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating the overcharge of a battery caused by frequent start-stop in the related art;
FIG. 4 is a timing diagram illustrating charging according to the overcharge condition shown in FIG. 3;
fig. 5 is a flowchart illustrating a vehicle charge management method according to an embodiment of the present invention applied to an in-vehicle air conditioner;
FIG. 6 is a charging timing diagram corresponding to the method for managing vehicle charging according to the embodiment of the present invention;
FIG. 7 is a block diagram of a vehicle charging management system according to an embodiment of the present invention;
fig. 8 is a block diagram of a vehicle charge management system according to another embodiment of the present invention.
Description of reference numerals:
70. 80 vehicle charging management system 701 thermosensitive temperature acquisition unit
702 pre-over-temperature judgment unit 703 target charging power calculation unit
704 charging control unit 801 temperature detection unit
802 temperature determination unit 803 zero power request transmission unit
804 PTC restart unit
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
In addition, the energy management system mentioned in the embodiment of the present invention is referred to as including all or part of the processor or the controller for managing the power supply and distribution of the entire vehicle, and may include, for example, a battery management system, a power control device, a power switch device, and the like.
Explanations regarding battery management system terminology; the battery management system calculates the current available charge-discharge power, the charge state, the health state and the like according to the voltage, the current, the temperature and other states of the power battery, protects the power battery, calculates the charging power of the whole vehicle in the charging process and carries out signal interaction with a related control unit.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, a vehicle charge management method according to an embodiment of the present invention includes:
and S11, acquiring the heating temperature of the thermistor.
Regarding the execution subject of the vehicle charge management method of the embodiment of the invention, it may be an energy management system, such as a battery management system or the like. In addition, the vehicle related to the vehicle charging management method according to the embodiment of the invention may be a vehicle having a charging requirement of the charging pile, such as a pure electric vehicle or a hybrid electric vehicle.
As described above, the thermistor is automatically turned off when the temperature reaches a certain value due to the PTC characteristic, so as to perform a safety protection function. Regarding the application scenario of the PTC resistor in the vehicle in the embodiment of the present invention, it may be diversified, and for example, it may be provided in an on-board Air Conditioner (AC) of the vehicle, thereby implementing the PTC Air Conditioner heating. Wherein the air conditioner AC is used to control the turning on of the air conditioning device (compressor/heater) and the power consumed by it, and to signal interaction with the related control unit.
Regarding the manner of acquiring the heating temperature in the embodiment of the present invention, it may be received from a dedicated temperature acquisition device in a communication manner (e.g., CAN bus signal), for example, directly receiving the heating temperature signal for the thermistor from the vehicle-mounted PTC air conditioner. In addition or as an alternative, it may also be possible to integrate a temperature detection module in the energy management system and to detect the heating temperature of the thermistor by directly calling up the temperature detection module.
And S12, judging whether the heating temperature exceeds a preset pre-over-temperature threshold value, wherein the pre-over-temperature threshold value is lower than the protection temperature threshold value of the thermistor.
It should be noted that the protection temperature threshold may be a temperature value corresponding to triggering the PTC protection feature, for example, triggering the thermistor to be turned off when the heating temperature of the thermistor reaches the protection temperature threshold. Accordingly, the pre-over-temperature threshold should be below the protection temperature threshold; regarding the size of the pre-over-temperature threshold, there should be no limitation, and it may be preferable that the temperature rise time required for ensuring the temperature to increase from the pre-over-temperature threshold to the protection temperature threshold is equal to or slightly greater than the reaction time of the energy management system for recalculating and requesting the charging post to redistribute power.
And S13, if the heating temperature exceeds the pre-over-temperature threshold, calculating the corresponding target charging pile power supply when the thermistor is disconnected.
It should be noted that, in the process of charging the vehicle with the energy management system by the charging pile, it may be based on that the energy management system requests the charging pile for corresponding power supply according to the power demand of the entire vehicle circuit. Accordingly, under normal operating conditions, the thermistor works in the whole vehicle loop, and occupies part of the power of the whole vehicle, namely the heating power; in the embodiment, when the heating temperature of the thermistor exceeds the pre-over-temperature threshold, the corresponding target charging pile power supply when the thermistor is disconnected is actively calculated, instead of being passively triggered due to the PTC characteristic when the temperature of the thermistor already exceeds the protection temperature threshold.
The calculation process of the power supplied by the target charging pile may include: if the heating temperature exceeds a pre-over-temperature threshold, acquiring the heating power distributed to the thermistor under the current working condition; acquiring the current charging pile supply power corresponding to the current working condition; and determining the supply power of the target charging pile based on the current supply power and the heating power of the charging pile. As an example, on the one hand, the current charging pile supply power is directly used to subtract the heating power to obtain the target charging pile supply power, and on the other hand, the difference between the current charging pile supply power and the heating power is combined with a compensation coefficient to correct and the like, and all of them fall within the protection scope of the present invention. Therefore, the calculation of the supply power of the target charging pile required by the whole vehicle when the thermistor is disconnected is realized through the energy management system.
And S14, controlling the charging pile to charge the vehicle according to the power supplied by the target charging pile.
In some embodiments, it may be that the energy management system of the vehicle sends a charging post supply request corresponding to the target charging post supply power to the charging post, so that the charging post supplies the vehicle with the electric power of the target charging post supply power in response to the charging request.
It should be noted that the target charging post power supply should be lower than the charging post power supply when the thermistor is present under the current operating conditions. In some application scenes, the setting of the magnitude of the pre-over-temperature threshold value can ensure that the temperature rise time required for increasing the temperature from the pre-over-temperature threshold value to the protection temperature threshold value is longer than the reaction time of the energy management system for recalculating and requesting the charging pile to redistribute the power, so that the calculation and the distribution request work corresponding to the power supplied by the target charging pile are completed before the thermistor is passively disconnected due to the PTC, and when the temperature rise causes the thermistor to be increased from the pre-over-temperature threshold value to the protection temperature threshold value, the power supply of the whole vehicle is in a state of matching the charging power, and the dangerous working condition of charging overvoltage caused by the reaction time can not occur.
In this embodiment, the energy management system compares the heating temperature of the thermistor with a pre-over-temperature threshold value that is smaller than the protection temperature threshold value, and actively calculates the corresponding target charging pile supply power or the vehicle demand power when the thermistor is disconnected when the heating temperature exceeds the pre-over-temperature threshold value, so as to control the charging pile to charge the vehicle according to the calculated target charging pile supply power. Therefore, compared with the situation that the thermistor is disconnected due to the PTC characteristic and the calculation is triggered passively, the method reserves the reaction time for the energy management system and the charging pile, avoids the situation that the battery is overcharged or self-ignited during charging when the thermistor is disconnected, and improves the safety and reliability of charging of the whole vehicle.
As shown in fig. 2, a vehicle charging management method according to an embodiment of the present invention includes:
and S21, detecting the heating temperature of the thermistor.
Regarding the execution body of the method of the embodiment of the present invention, it may be an existing processing unit or an additional processing unit associated with the thermistor, etc., and as an example, when the thermistor is provided in an in-vehicle air conditioner, the execution soil body for executing the method of the embodiment of the present invention may be an in-vehicle air conditioner processor. Further, the vehicle-mounted air conditioner may collect the heating temperature of the thermistor by a temperature sensor provided therein.
And S22, judging whether the heating temperature exceeds a preset pre-over-temperature threshold value, wherein the pre-over-temperature threshold value is lower than the protection temperature threshold value of the thermistor.
The pre-over-temperature threshold may be preset according to the processing performance of the energy management system or the personalized requirements of the user, which should not be limited herein.
And S23, if the heating temperature exceeds the pre-over-temperature threshold value, sending a zero heating power request to the energy management system, so that the energy management system calculates the corresponding target charging pile supply power when the thermistor is disconnected.
In the embodiment of the invention, when the temperature of the thermistor is detected to be reduced to the pre-over-temperature threshold value lower than the protection temperature threshold value, the zero heating power request is sent to the energy management system, so that the energy management system is ready to not actively distribute power for the thermistor before the PTC protection is triggered, and reaction time is reserved for processing the charging pile and the energy management system under the disconnection working condition of the thermistor, thereby avoiding the situation of battery overcharge or charging spontaneous combustion when the thermistor is disconnected, and improving the safety and reliability of the charging of the whole vehicle.
It should be noted that, when the energy management system in the embodiment of the present invention allocates power to each component or thermistor, it may be implemented based on a heating power request sent by the thermistor portion, for example, when the vehicle air conditioner sends a heating power request of 1.0KW to the energy management system, the energy management system accordingly allocates power electric power corresponding to the heating power request to the vehicle air conditioner through the high-voltage battery or the charging pile.
In some preferred embodiments, a PTC restart temperature is also configured for the thermistor, wherein the PTC restart temperature may be a value lower than the pre-over-temperature threshold, thereby enabling a re-power-up when the thermistor is over-temperature disconnected and the temperature returns to normal based on the PTC restart temperature. Specifically, after the charging pile is controlled to charge the vehicle according to the power supplied by the target charging pile, the method further comprises the following steps: the heating temperature of the thermistor is re-detected, and when the re-detected heating temperature of the heating resistor falls below the PTC restart temperature, the thermistor is restarted to restore the thermistor from the off state to the normal operating state and to allow power distribution from the battery management system to be received.
In the related art, the thermistor is disconnected when the heating temperature exceeds the protection temperature threshold, and the energy management system is not required to distribute power to the thermistor, but the overcharge problem exists. In contrast, in the present embodiment, it is proposed that a zero heating power request may be sent to the energy management system when the heating temperature exceeds a pre-excessive temperature threshold lower than the protection temperature threshold, so as to allow the energy management system to calculate the power supplied by the corresponding target charging pile when the thermistor is disconnected in advance, and thus by reducing the power in advance, the situation of battery overcharge does not occur when the thermistor is disconnected later due to the PTC characteristic.
Fig. 3 shows a schematic flow of battery overcharge caused by frequent start and stop in the related art, in which a PFC resistance heater is disposed in an air conditioner, and other components, such as a CMP (compressor, air conditioner) may be disposed in the air conditioner. Specifically, when a vehicle is charged, a customer connects the vehicle to a charging pile, and at the moment, the customer turns on an air conditioner to heat, and the air conditioner sends required heating power to a Battery Management System (BMS); the BMS collects power required by each component in a finished automobile loop when the finished automobile is charged so as to determine required power of the finished automobile, and sends a charging request to the charging pile according to the required power of the finished automobile so as to request the charging pile to distribute power supply corresponding to the required power of the finished automobile to the finished automobile; furthermore, after the BMS receives the power supply from the charging post, power distribution is performed on the entire vehicle, and a general air conditioner normally operates under the distributed power, but there is a case where a thermistor therein reaches a temperature protection threshold due to PTC characteristics and is automatically turned off, and at this time, since the air conditioner is suddenly turned off, the magnitude of the charging current of the charging post cannot be changed temporarily, and thus, the battery is overcharged.
As shown in fig. 4, a charging timing diagram corresponding to the overcharge condition shown in fig. 3 is shown, wherein during the charging process of the entire vehicle, the BMS calculates and sums the power consumption of the entire vehicle in advance, and requests a charging current from the power grid. When the air conditioner PTC reaches the temperature protection threshold value, the PTC controller can automatically stop, a time difference t can be generated at the moment, the BMS and the charging pile can not react in time, and therefore the battery overcharging occurs. Due to the existence of the reaction time t required by the BMS and the charging pile and the fact that the PTC cannot predict when the PTC reaches the temperature protection threshold value, the BMS cannot be informed of the request for reducing the charging power in advance, and the potential safety hazard is caused by the existence of delay in the charging power request.
In view of this, the embodiment of the invention proposes to set the first temperature value and the second temperature value at the threshold value of the temperature of the PTC. The first temperature value is a rated temperature protection threshold value of the PTC, and the second temperature value is a pre-over-temperature threshold value of the PTC. As shown in fig. 5, a flow of a vehicle charging management method according to an embodiment of the present invention applied to a vehicle-mounted air conditioner specifically includes: when the PTC detects that the temperature threshold value reaches the second temperature protection threshold value, the air conditioner AC stops sending the PTC power value to the BMS, at the moment, although the PTC power value sent by the air conditioner AC is 0, the PTC still works and does not stop power consumption, after the PTC temperature threshold value reaches the first temperature threshold value, the PTC stops working, and at the moment, the BMS request power does not contain the PTC consumed power any more. Therefore, the charging problem of the battery is avoided, and the safety of the charging process is improved. In addition, in some embodiments, the method according to the embodiments of the present invention may also be performed by the BMS, for example, the BMS acquires temperature detection information of the PTC resistor, and removes the power originally allocated to the PTC resistor in advance according to the temperature detection information to recalculate the required power of the entire vehicle, thereby requesting the charging pile for power supply corresponding to the new power.
The setting of the second temperature value (or pre-over-temperature threshold) in the embodiment of the present invention needs to comply with the following requirements: the second temperature value needs to be between the temperature thresholds of the automatic start and stop of the PTC, namely, the temperature value of the PTC which is restarted after the PTC over-temperature protection is less than the second temperature value less than the first temperature value. Referring to fig. 6, it is shown that the charging time chart corresponding to the anti-overcharge condition is processed by applying the vehicle charging management method according to the embodiment of the present invention, wherein under various conditions of operating the air conditioner, the time T for raising the temperature from the second temperature threshold to the first temperature threshold needs to be less than T in the battery overcharge analysis time chart, that is, T < T, and the expected effect can be achieved.
In the embodiment of the invention, the low-temperature threshold, namely the pre-over-temperature threshold, is newly added outside the rated temperature protection threshold of the PTC, so that the battery can not be overcharged due to the frequent starting and stopping characteristics of the PTC when the air conditioner is started in the charging process on the basis of energy management, and the safety problem of vehicle spontaneous combustion in the charging process is avoided.
As shown in fig. 7, a vehicle charging management system 70 according to an embodiment of the present invention is a vehicle having a thermistor disposed therein and connected to a charging post for charging, wherein the vehicle charging management system 70 includes: a thermosensitive temperature acquiring unit 701 for acquiring a heating temperature of the thermistor; a pre-over-temperature determination unit 702, configured to determine whether the heating temperature exceeds a pre-over-temperature threshold, where the pre-over-temperature threshold is lower than a protection temperature threshold of the thermistor; a target charging power calculation unit 703, configured to calculate, if the heating temperature exceeds the pre-excess temperature threshold, power supplied by a corresponding target charging pile when the thermistor is turned off; and a charging control unit 704, configured to control the charging pile to charge the vehicle according to the power supplied by the target charging pile.
In some embodiments, the target charging power calculation unit 703 includes: the current heating power acquisition module is used for acquiring the heating power distributed to the thermistor under the current working condition if the heating temperature exceeds the pre-over-temperature threshold value; the current charging pile power acquisition module is used for acquiring the current charging pile supply power corresponding to the current working condition; and the target charging pile power determining module is used for determining the supply power of the target charging pile based on the current charging pile supply power and the heating power.
Among them, the vehicle charge management system 70 of the embodiment of the invention may be integrated in the energy control system or the battery management system as a form of a functional module.
As shown in fig. 8, a vehicle charging management system 80 according to an embodiment of the present invention is a vehicle in which a thermistor and an energy management system are disposed, and the vehicle is connected to a charging pile for charging, wherein the vehicle charging management system 80 includes: a temperature detection unit 801 for detecting a heating temperature of the thermistor; a temperature determining unit 802, configured to determine whether the heating temperature exceeds a preset pre-over-temperature threshold, where the pre-over-temperature threshold is lower than a protection temperature threshold of the thermistor; a zero power request sending unit 803, configured to send a zero heating power request to the energy management system if the heating temperature exceeds the pre-over-temperature threshold, so that the energy management system calculates power supplied by the corresponding target charging pile when the thermistor is turned off.
In some embodiments, the vehicle charge management system 80 further includes a PTC restart unit 804 for re-detecting a heating temperature of the thermistor and restarting the thermistor when the re-detected heating temperature falls below a PTC restart temperature, wherein the PTC restart temperature is less than the pre-over-temperature threshold value.
Among them, the vehicle charge management system 80 of the embodiment of the invention may be integrated in the form of a functional module in the PTC controller or the vehicle-mounted air conditioner.
For more details of the vehicle charging management system according to the embodiment of the present invention, reference may be made to the above description of the vehicle charging management method, and the same or corresponding technical effects as those of the vehicle charging management method described above are obtained, which are not repeated herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A vehicle charge management method, characterized in that a thermistor is provided in a vehicle, and the vehicle is connected to a charging post for charging, wherein the vehicle charge management method comprises:
acquiring the heating temperature of the thermistor;
judging whether the heating temperature exceeds a preset pre-over-temperature threshold value or not, wherein the pre-over-temperature threshold value is lower than a protection temperature threshold value of the thermistor;
if the heating temperature exceeds the pre-over-temperature threshold value, calculating the corresponding target charging pile supply power when the thermistor is disconnected;
and controlling the charging pile to charge the vehicle according to the power supplied by the target charging pile.
2. The vehicle charge management method according to claim 1, wherein the controlling the charging pile to charge the vehicle according to the power supplied by the target charging pile comprises:
transmitting a charging pile supply request corresponding to the target charging pile supply power to the charging pile so that the charging pile supplies the vehicle with the electric power of the target charging pile supply power in response to the charging request.
3. The vehicle charge management method according to claim 1, wherein the calculating the power supplied by the corresponding target charging post when the thermistor is turned off if the heating temperature exceeds the pre-over-temperature threshold value comprises:
if the heating temperature exceeds the pre-over-temperature threshold, acquiring the heating power distributed to the thermistor under the current working condition;
acquiring the current charging pile supply power corresponding to the current working condition;
and determining the supply power of the target charging pile based on the current charging pile supply power and the heating power.
4. The vehicle charge management method according to any one of claims 1 to 3, characterized in that the vehicle includes an in-vehicle air conditioner, wherein the thermistor is provided in the in-vehicle air conditioner.
5. A vehicle charging management method is characterized in that a thermistor and an energy management system are arranged in a vehicle, and the vehicle is connected with a charging pile for charging, wherein the vehicle charging management method comprises the following steps:
detecting the heating temperature of the thermistor;
judging whether the heating temperature exceeds a preset pre-over-temperature threshold value or not, wherein the pre-over-temperature threshold value is lower than a protection temperature threshold value of the thermistor;
and if the heating temperature exceeds the pre-over-temperature threshold value, sending a zero heating power request to the energy management system, so that the energy management system calculates the corresponding target charging pile supply power when the thermistor is disconnected.
6. The vehicle charge management method of claim 5, further comprising, after sending a zero heating power request to the energy management system if the heating temperature exceeds the pre-over-temperature threshold:
re-detecting the heating temperature of the thermistor;
restarting the thermistor when the re-detected heating temperature falls below a PTC restart temperature, wherein the PTC restart temperature is less than the pre-over-temperature threshold.
7. A vehicle charge management system, characterized in that a thermistor is provided in a vehicle, and the vehicle is connected to a charging post for charging, wherein the vehicle charge management system comprises:
a thermistor temperature acquisition unit for acquiring a heating temperature of the thermistor;
the pre-over-temperature judging unit is used for judging whether the heating temperature exceeds a preset pre-over-temperature threshold value or not, wherein the pre-over-temperature threshold value is lower than a protection temperature threshold value of the thermistor;
the target charging power calculation unit is used for calculating the corresponding target charging pile supply power when the thermistor is disconnected if the heating temperature exceeds the pre-over-temperature threshold;
and the charging control unit is used for controlling the charging pile to charge the vehicle according to the power supplied by the target charging pile.
8. The vehicle charge management system according to claim 7, wherein the target charging power calculation unit includes:
the current heating power acquisition module is used for acquiring the heating power distributed to the thermistor under the current working condition if the heating temperature exceeds the pre-over-temperature threshold value;
the current charging pile power acquisition module is used for acquiring the current charging pile supply power corresponding to the current working condition;
and the target charging pile power determining module is used for determining the supply power of the target charging pile based on the current charging pile supply power and the heating power.
9. A vehicle charge management system, characterized in that a thermistor and an energy management system are provided in a vehicle, and the vehicle is connected to a charging post for charging, wherein the vehicle charge management system comprises:
a temperature detection unit for detecting a heating temperature of the thermistor;
the temperature judging unit is used for judging whether the heating temperature exceeds a preset pre-over-temperature threshold value or not, wherein the pre-over-temperature threshold value is lower than a protection temperature threshold value of the thermistor;
and the zero power request sending unit is used for sending a zero heating power request to the energy management system if the heating temperature exceeds the pre-over-temperature threshold value, so that the energy management system calculates the power supplied by the corresponding target charging pile when the thermistor is disconnected.
10. The vehicle charge management system according to claim 9, further comprising a PTC restart unit configured to re-detect a heating temperature of the thermistor, and restart the thermistor when the re-detected heating temperature falls below a PTC restart temperature that is less than the pre-over-temperature threshold value.
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| CN201811647317.9A CN111376751A (en) | 2018-12-29 | 2018-12-29 | Vehicle charging management method and system |
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| CN201811647317.9A CN111376751A (en) | 2018-12-29 | 2018-12-29 | Vehicle charging management method and system |
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