CN112874382A - Charging monitoring system and method for pure electric commercial vehicle - Google Patents

Charging monitoring system and method for pure electric commercial vehicle Download PDF

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Publication number
CN112874382A
CN112874382A CN202110270736.0A CN202110270736A CN112874382A CN 112874382 A CN112874382 A CN 112874382A CN 202110270736 A CN202110270736 A CN 202110270736A CN 112874382 A CN112874382 A CN 112874382A
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charging
battery
box
pure electric
power battery
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Inventor
王昆
谢晏
郑秀华
郑艳
陈玉容
陈剑
柯红平
陈道勇
杨魁
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Jiangxi B Energy Shangrao Coach Co Ltd
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Jiangxi B Energy Shangrao Coach Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • 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
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a charging monitoring system and a charging monitoring method for a pure electric commercial vehicle, which comprise the following steps: the system comprises a pure electric commercial vehicle, a charger, a CANoe box and a computer, wherein a power battery box and a BMS are arranged in the pure electric commercial vehicle, the power battery box is connected with a power battery junction box through a high-voltage cable, the front part of the pure electric commercial vehicle is provided with an OBD (on-board diagnostics), the rear side part of the pure electric commercial vehicle is provided with a charging interface, the input end of the charging interface is connected with the charger through the high-voltage cable, and the output end of the charging interface; the battery box is connected with the power battery junction box, the power battery junction box is connected with the BMS, the BMS is connected with the charging interface, the BMS is connected with the OBD, the charging interface is connected with the charger through CAN communication lines, the OBD interface line is connected between the OBD and the CANoe box, and the CANoe communication line is connected between the CANoe box and the computer. The charging monitoring system and method for the pure electric commercial vehicle have the characteristics of simple structure, convenience in use and high efficiency and rapidness in the measuring process.

Description

Charging monitoring system and method for pure electric commercial vehicle
Technical Field
The invention relates to the technical field of pure electric commercial vehicles, in particular to a charging monitoring system and method of a pure electric commercial vehicle.
Background
The pure electric commercial vehicle is generally charged in a high-power direct-current charging mode, and data communication is mainly carried out between a high-power direct-current charger and a BMS through a CAN bus in the direct-current charging process. The information of the interaction between the charger and the BMS is generally checked by the whole vehicle factory through a display screen of the charger, and the fault analysis method has limitations and is difficult to find out the problems in the charging process because the display content is less and the CAN bus state analysis cannot be carried out. Meanwhile, for the whole car factory, the requirement of battery energy testing is increasingly highlighted, and on one hand, the nominal energy of the battery of a supplier needs to be verified so as to find the problem that the battery manufacturer has fewer batteries and mistakenly installs the batteries as soon as possible; on the other hand, the decay rate needs to be obtained by comparing the energy test result with the nominal energy so as to evaluate the service life of the battery.
The battery energy is the product of the battery voltage and the battery capacity, which is expressed as the total charge in the electrochemical reaction. At present, a full-charge method is commonly used for measuring the battery capacity, namely, the battery is charged with constant current and constant voltage and then discharged with constant current, and the discharged electric quantity is the capacity of the battery. Although the measurement is relatively accurate, the method is long in time, needs professional charging and discharging equipment and is inconvenient to implement on site. Based on the above problems, a new pure electric commercial vehicle charging monitoring system and method are urgently needed to be provided.
Disclosure of Invention
The invention aims to provide a charging monitoring system and a charging monitoring method for a pure electric commercial vehicle, which CAN analyze the state of a CAN bus in the charging process of the pure electric commercial vehicle, verify the nominal energy of a battery and evaluate the service life of the battery, and have the characteristics of simple structure, convenience in use and efficient and rapid measuring process.
In order to achieve the purpose, the invention provides the following scheme:
a pure electric commercial car charge monitored control system includes: the system comprises a pure electric commercial vehicle, a charger, a CANoe box and a computer, wherein a power battery box and a BMS are arranged in the pure electric commercial vehicle, the power battery box is connected with a power battery junction box through a high-voltage cable, the front part of the pure electric commercial vehicle is provided with an OBD (on-board diagnostics), the rear side part of the pure electric commercial vehicle is provided with a charging interface, the input end of the charging interface is connected with the charger through the high-voltage cable, the output end of the charging interface is connected with the power battery junction box through the high-voltage cable, and the charger is used for charging the power battery box through; the power battery box is connected with the power battery junction box, the power battery junction box is connected with the BMS, the BMS is connected with the charging interface, and the BMS is connected with the OBD through CAN communication lines, and the charging interface is connected with the charger through CAN communication lines; an OBD interface line for communication is connected between the OBD and the CANoe box, and a CANoe communication line is connected between the CANoe box and the computer; the power battery terminal box is used for the series-parallel connection of power battery box, BMS is used for right the state information of the inside electric core of power battery box detects and manages, and with the machine that charges carries out the communication, OBD is used for gathering whole car CAN bus information, the CANoe box is used for gathering electricelectric commercial car charging process CAN communication signal, and passes through the computer display.
Optionally, the power battery boxes are multiple, and are connected in series through a high-voltage cable, and multiple, a CAN communication line is further connected between the power battery boxes.
Optionally, the computer is a general computer provided with the window10 system.
The invention also provides a charging monitoring method of the pure electric commercial vehicle, which is applied to the charging monitoring system of the pure electric commercial vehicle, and the method comprises the steps of designing a charging monitoring function and estimating the total energy of the battery;
first, the designing of the charge monitoring function includes:
building a DBC database: 16-system signals in CAN communication are converted into 10-system signals through a standard configuration DBC file, so that the signals are convenient to check, and the method specifically comprises the following steps:
s1, opening a CANdb + + Editor module in the CANoe, creating a signal according to the specification of the national standard GB/T27930, and defining the name, the length, the resolution and the offset of the signal;
s2, establishing communication signal classification in the charging process according to the specification of national standard GB/T27930, and establishing signal frames according to the classification; the communication signal classification includes: the method comprises the following steps that 5 types of CAN communication signals including a low-voltage auxiliary power-on and charging handshake stage, a charging parameter configuration stage, a charging end stage and an error message are included, the signal frame adopts a frame format of CAN extended frame 29-bit identifiers, related nodes only comprise a charger and a BMS, and the node addresses are 0x56 and 0xF4 respectively;
s3, adding the signal into the corresponding signal frame according to the specification of the national standard GB/T27930;
designing a charging monitoring interface: the method comprises the following specific steps:
a1, opening a Panel Editor module in a CANoe, establishing 5 interfaces according to 5 types of CAN communication signals specified by the national standard GB/T27930, and realizing paging display through a 'Tab Control' Control;
a2, for each interface, designing a BMS and a charger by adopting an 'Input/Output Box' control to send two large columns of signals, and creating a signal in each column according to the GB/T27930 rule;
a3, associating the message signals and system variables in the database with corresponding controls;
and (3) analyzing multi-packet data: when the transmission signal data exceeds 8 bytes in the charging process, certain specifications are required to be adopted for analysis, the charging parameters are ensured to be displayed completely and accurately, and the method specifically comprises the following steps:
b1, finding out signals with the signal length smaller than 8 bits and larger than 8 bits;
b2, analyzing the signal with the length less than 8 bits, and adopting the analysis formula as follows: the digital quantity resolution plus the offset is an actual value, the actual value is assigned to a corresponding system variable, the system variable is associated with a corresponding control of the Panel, and the actual value can be directly displayed;
b3, analyzing the signal with length larger than 8 bit signal, placing the high bit of CAN signal at the high bit of high byte, placing the low bit of signal at the low bit of low byte, analyzing and arranging oppositely, the high byte is at the front, the low byte is at the back, obtaining the actual value according to the analyzing formula in the step B2 after arranging, and assigning to the corresponding system variable;
second, estimate total energy of the battery: when the SOC is less than 20% or the SOC is more than 90%, estimating the total energy of the battery by adopting an ampere-hour integration method, correcting by using an open-circuit voltage method, and when the SOC is in a region of 20% -90%, estimating the total energy of the battery by adopting the ampere-hour integration method; the specific steps for estimating the total energy of the battery are as follows:
c1, designing a measuring key by using a 'Switch/Indicator' control of 'Panel Editor', and reading the nominal total energy W and the nominal capacity C of the power battery in the BMS sending information when the key is pressedNSOC, reading the voltage v in the information sent by the chargerBOThe current I output value, and the current SOC value is recorded as SOC0Considering that the resolution of the SOC value is 1%, if the first-time collected SOC is directly used to start ampere-hour integration, a large error is caused, so the SOC is designed to be equal to the SOC0When the SOC value is increased by 5%, namely the SOC is equal to the SOC, the charging capacity is calculated0When the battery total energy reaches + 6%, estimating actually measured battery energy and an energy difference value according to the battery total energy estimation method;
c2, the pure electric commercial vehicle adopts a charger to charge for a period of time, and a Switch/Indicator button is pressed;
and C3, obtaining the estimated and measured battery energy and the energy difference.
Optionally, the equation of the ampere-hour integration method is as follows:
Figure BDA0002974276270000031
W＝CN×a
in the formula: cNIs rated capacity; i is the battery current; SOC0Is in a charge-discharge initial state; w is the battery energy; a is the open circuit voltage when the battery is fully charged;
the open circuit voltage method formula is as follows:
Figure BDA0002974276270000041
in the formula: v. ofBOAn open circuit voltage for the battery; a is the open circuit voltage when the battery is fully charged; b is the open circuit voltage after the battery is fully discharged.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: according to the charging monitoring system and method for the pure electric commercial vehicle, in the design of the charging monitoring function, a DBC database is established, DBC files are configured in a standardized mode, 16-system signals in CAN communication are converted into 10-system signals, the checking is convenient, a charging monitoring interface is designed, related signals are displayed according to requirements, an interactive control button is designed, the interface is simple and easy to operate, transmission data which exceed 8 bytes exist in the charging process are analyzed through multi-packet data analysis, a certain standard is adopted for analysis, and the charging parameters are guaranteed to be displayed completely and accurately; in the estimation of the total energy of the battery, accurate battery energy can be obtained in the actual charging process through software; the monitoring system is connected with an OBD interface of the pure electric commercial vehicle through a CANoe box connected with a computer, can acquire state information in the charging process of the pure electric commercial vehicle and displays the state information through application software on the computer; the charging monitoring system and method for the pure electric commercial vehicle have the characteristics of simple structure, convenience in use and high efficiency and rapidness in the measuring process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a charging monitoring system of a pure electric commercial vehicle according to the present invention;
fig. 2 is a flow chart of building a DBC database of the pure electric commercial vehicle charging monitoring system and method of the present invention;
FIG. 3 is a schematic view of a charging monitoring interface of the pure electric commercial vehicle charging monitoring system and method according to the present invention;
FIG. 4 is a flow chart of estimating total energy of a battery of the pure electric commercial vehicle charging monitoring system and method of the invention;
description of reference numerals: 1. a pure commercial vehicle; 2. a CANoe box; 3. a computer; 4. a charger; 101. OBD; 102. a BMS; 103. a power battery junction box; 104. a charging interface; 105. power battery box.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a charging monitoring system and a charging monitoring method for a pure electric commercial vehicle, which CAN analyze the state of a CAN bus in the charging process of the pure electric commercial vehicle, verify the nominal energy of a battery and evaluate the service life of the battery, and have the characteristics of simple structure, convenience in use and efficient and rapid measuring process.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The charging monitoring system for the pure electric commercial vehicle, as shown in fig. 1, specifically comprises: the device comprises a pure electric commercial vehicle 1, a charger 4, a CANoe box 2 and a computer 3;
the pure electric commercial vehicle 1 is internally provided with a power battery box 105 and a BMS102, the pure electric commercial vehicle 1 is a vehicle taking a plurality of power battery boxes 105 as power sources, the power battery boxes 105 are the power sources of the whole vehicle and consist of a plurality of power battery boxes 105, and a large number of battery cells are arranged in a single power battery box 105; the power battery box 105 is connected with the power battery junction box 103 through a high-voltage cable, the OBD101 is arranged at the front part of the pure electric commercial vehicle 1, the charging interface 104 is arranged at the rear side of the pure electric commercial vehicle 1, the charging interface 104 is a national standard and is reserved for the pure electric commercial vehicle 1, the charging interface is used during charging, the input end of the charging interface 104 is connected with the charger 4 through the high-voltage cable, the output end of the charging interface is connected with the power battery junction box 103 through the high-voltage cable, and the charger 4 is used for charging the power battery box 105 through connecting the charging interface 104 and the power battery junction box 103; the power battery boxes 105 are multiple, and the power battery boxes 105 are connected in series through high-voltage cables so as to meet the requirement of a driving voltage platform of the whole vehicle; the power battery junction box 103 is a special box body for high-voltage cable switching, can be connected with a plurality of input cables of the power battery boxes 105, can perform series-parallel connection of the plurality of power battery boxes 105 inside, and is internally provided with a copper bar, a safety catch, a relay, a current sensor and a voltage sensor;
the power battery boxes 105 and the power battery junction box 103, the power battery junction box 103 and the BMS102, the BMS102 and the charging interface 104, and the BMS102 and the OBD101 are connected through CAN communication lines, and the charging interface 104 and the charger 4, and the plurality of power battery boxes 105 are connected through CAN communication lines;
the BMS102 is a battery management system, and is configured to detect and manage states of battery cells in the power battery box 105, communicate with the charger 4 during charging, adjust charging current and voltage by the charger 4 according to battery states fed back by the BMS102, detect voltage of each battery cell in real time by the BMS102 according to current and voltage output by the charger 4, and estimate energy of the whole power battery box 105;
an OBD interface line for communication is connected between the OBD101 and the CANoe box 2, and a CANoe communication line is connected between the CANoe box 2 and the computer 3; the computer 3 is a software carrier of the charging monitoring system of the pure electric commercial vehicle 1, a common computer (a memory: 2G, a hard disk: 500G, and a system: window10) can be provided with CANoe software; the CANoe software is used for analyzing, displaying and analyzing the CAN communication signals collected by the CANoe box 2 in the charging process of the pure electric commercial vehicle 1, carrying out personalized configuration design and meeting specific requirements; the CANoe communication line is a communication line between the CANoe box 2 and the computer 3; the OBD interface line is a communication line between the CANoe box 2 and the OBD 101; the OBD interface 101 is a national standard, a CAN bus interface is reserved in the pure electric commercial vehicle 1, and CAN bus information of the whole vehicle CAN be collected through the interface; the charger 4 is a direct-current high-power charger and charges the power battery box 105 when the energy of the power battery box 105 is small; the OBD101 is used for collecting CAN bus information of the whole vehicle, the CANoe box 2 establishes communication with the BMS through an interface of the OBD101, collects CAN communication signals in the charging process of the pure electric commercial vehicle 1, application software is designed on the computer 3, and the CANoe box 2 displays the collected information through the computer 3;
the charging monitoring method of the pure electric commercial vehicle comprises the steps of designing a charging monitoring function and estimating total energy of a battery, wherein the designing of the charging monitoring function comprises the steps of building a DBC (database management center) database, designing a charging monitoring interface and analyzing multi-packet data;
the design of the charging monitoring function is to realize vivid display of interaction signals in all charging processes; the DBC database is established, and a DBC file is configured according to a certain specification to convert a 16-system signal in CAN communication into a 10-system signal, so that the DBC file is convenient to check; as shown in fig. 2, the specific steps of establishing the DBC database include: opening a CANdb + + Editor module in a CANoe, creating a signal according to the specification of the national standard GB/T27930, and defining the name, the length, the resolution and the offset of the signal; secondly, establishing communication signal classification in the charging process according to the specification of national standard GB/T27930, and establishing signal frames according to the classification; thirdly, adding the signals into corresponding signal frames according to the specification of the national standard GB/T27930; in the second step, a charging process communication signal classification is created according to the specification of the national standard GB/T27930, and a signal frame is created according to the classification, specifically: the low-voltage auxiliary power-on and charging handshake stage, the charging parameter configuration stage, the charging end stage and the error message are divided into 5 types of CAN communication signals in total, a signal frame adopts a frame format as a CAN extended frame 29-bit identifier, wherein related nodes only comprise a charger 4 and a BMS102, and the node addresses are 0x56 and 0xF4 respectively;
the charging monitoring interface is designed, related signals are displayed according to requirements, and meanwhile, interactive control buttons are designed, so that the interface is simple and easy to operate; as shown in fig. 3, the specific steps of designing the charging monitoring interface include: step one, opening a Panel Editor module in a CANoe, establishing 5 interfaces according to 5 types of CAN communication signals specified by GB/T27930, and realizing paging display through a 'Tab Control' Control; secondly, designing BMS102 and charger 4 to send two large-column signals by adopting an 'Input/Output Box' control in each interface, and creating signals in each column according to the GB/T27930 rule; thirdly, associating the message signals and the system variables in the database with corresponding controls;
analyzing the multi-packet data, wherein when the transmission data exceeds 8 bytes in the charging process, a certain standard is adopted for analyzing, so that the charging parameters are ensured to be displayed completely and accurately; the specific steps of the multi-packet data analysis are as follows: firstly, finding out signals with the signal length smaller than 8 bits and larger than 8 bits; secondly, analyzing the signal with the length less than 8 bits by adopting an analysis formula as follows: the digital quantity resolution plus the offset is an actual value, the actual value is assigned to a corresponding system variable, the system variable is associated with a corresponding control of the Panel, and the actual value can be directly displayed; thirdly, analyzing the signal with the length larger than 8 bits, placing the high bit of the CAN signal at the high bit of the high byte, placing the low bit of the signal at the low bit of the low byte, and obtaining an actual value according to an analysis formula in the second step after the high byte is in front and the low byte is in back and the actual value is assigned to a corresponding system variable after the low byte is in back;
the estimation of the total energy of the battery has the function of accurately calculating the SOC of the battery and the actual battery energy; the method comprises the steps of performing correction by using an open-circuit voltage method while performing ampere-hour integration when the SOC is low or high, wherein the SOC is in a region of 20% -90%, the ampere-hour integration method is adopted when the SOC is low or high, namely the SOC is less than 20% or the SOC is more than 90%, a data source is CAN bus information of charging interaction, and the formula of the ampere-hour integration method is as follows:
Figure BDA0002974276270000071
W＝CN×a
in the formula: cNIs rated capacity; i is the battery current; SOC0Is in a charge-discharge initial state; w is the battery energy; a is the open circuit voltage when the battery is fully charged;
the open circuit voltage method formula is as follows:
Figure BDA0002974276270000081
in the formula: v. ofBOAn open circuit voltage for the battery; a is the open circuit voltage when the battery is fully charged; b is the open circuit voltage after the battery is fully discharged;
the total energy of the battery is estimated, and accurate battery energy is obtained in the actual charging process through software, as shown in fig. 4, the specific steps are as follows: the first step is as follows: a measuring key is designed by utilizing a Switch/Indicator control of a 'Panel Editor', when the key is pressed down, the nominal total energy W, the nominal capacity and the SOC of a power battery in information sent by the BMS102 are read, the voltage and current output values in information sent by the charger 4 are read, and the current SOC value is recorded as the SOC0Considering that the resolution of the SOC value is 1%, if the first SOC is directly used to start ampere-hour integration, a large error may be caused, so the SOC value is designed to be SOC when the SOC reaches the SOC0Starting an ampere-hour integration algorithm at + 1%, simultaneously starting continuous timing by a timer, calculating the charging capacity by combining the read charging current, and when the SOC value is increased by 5%, namely the SOC is equal to the SOC0When the battery energy reaches + 6%, estimating actually measured battery energy and an energy difference value; the second step is that: the pure electric commercial vehicle is charged for a period of time by a chargerA lower Switch/Indicator button; the third step: and obtaining the estimated and measured battery energy and the energy difference value.
According to the charging monitoring system and method for the pure electric commercial vehicle, in the design of the charging monitoring function, a DBC database is established, DBC files are configured in a standardized mode, 16-system signals in CAN communication are converted into 10-system signals, the checking is convenient, a charging monitoring interface is designed, related signals are displayed according to requirements, an interactive control button is designed, the interface is simple and easy to operate, transmission data which exceed 8 bytes exist in the charging process are analyzed through multi-packet data analysis, a certain standard is adopted for analysis, and the charging parameters are guaranteed to be displayed completely and accurately; in the estimation of the total energy of the battery, accurate battery energy can be obtained in the actual charging process through software; the monitoring system is connected with an OBD interface of the pure electric commercial vehicle through a CANoe box connected with a computer, can acquire state information in the charging process of the pure electric commercial vehicle and displays the state information through application software on the computer; the charging monitoring system and method for the pure electric commercial vehicle have the characteristics of simple structure, convenience in use and high efficiency and rapidness in the measuring process.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (5)

1. The utility model provides a pure commercial car monitored control system that charges which characterized in that includes: the system comprises a pure electric commercial vehicle, a charger, a CANoe box and a computer, wherein a power battery box and a BMS are arranged in the pure electric commercial vehicle, the power battery box is connected with a power battery junction box through a high-voltage cable, the front part of the pure electric commercial vehicle is provided with an OBD (on-board diagnostics), the rear side part of the pure electric commercial vehicle is provided with a charging interface, the input end of the charging interface is connected with the charger through the high-voltage cable, the output end of the charging interface is connected with the power battery junction box through the high-voltage cable, and the charger is used for charging the power battery box through; the power battery box is connected with the power battery junction box, the power battery junction box is connected with the BMS, the BMS is connected with the charging interface, and the BMS is connected with the OBD through CAN communication lines, and the charging interface is connected with the charger through CAN communication lines; an OBD interface line for communication is connected between the OBD and the CANoe box, and a CANoe communication line is connected between the CANoe box and the computer; the power battery terminal box is used for the series-parallel connection of power battery box, BMS is used for right the state information of the inside electric core of power battery box detects and manages, and with the machine that charges carries out the communication, OBD is used for gathering whole car CAN bus information, the CANoe box is used for gathering electricelectric commercial car charging process CAN communication signal, and passes through the computer display.
2. A pure electric commercial vehicle charging monitoring system as claimed in claim 1, wherein the number of the power battery boxes is plural, the plural power battery boxes are connected in series through a high voltage cable, and a CAN communication line is further connected between the plural power battery boxes.
3. The pure electric commercial vehicle charging monitoring system according to claim 1, wherein the computer is a general computer provided with a window10 system.
4. A pure electric commercial vehicle charging monitoring method is applied to the pure electric commercial vehicle charging monitoring system of any one of claims 1 to 3, and is characterized by comprising the steps of designing a charging monitoring function and estimating total energy of a battery;
first, the designing of the charge monitoring function includes:
building a DBC database: 16-system signals in CAN communication are converted into 10-system signals through a standard configuration DBC file, so that the signals are convenient to check, and the method specifically comprises the following steps:
s1, opening a CANdb + + Editor module in the CANoe, creating a signal according to the specification of the national standard GB/T27930, and defining the name, the length, the resolution and the offset of the signal;
s2, establishing communication signal classification in the charging process according to the specification of national standard GB/T27930, and establishing signal frames according to the classification; the communication signal classification includes: the method comprises the following steps that 5 types of CAN communication signals including a low-voltage auxiliary power-on and charging handshake stage, a charging parameter configuration stage, a charging end stage and an error message are included, the signal frame adopts a frame format of CAN extended frame 29-bit identifiers, related nodes only comprise a charger and a BMS, and the node addresses are 0x56 and 0xF4 respectively;
s3, adding the signal into the corresponding signal frame according to the specification of the national standard GB/T27930;
designing a charging monitoring interface: the method comprises the following specific steps:
a1, opening a Panel Editor module in a CANoe, establishing 5 interfaces according to 5 types of CAN communication signals specified by the national standard GB/T27930, and realizing paging display through a 'Tab Control' Control;
a2, for each interface, designing a BMS and a charger by adopting an 'Input/Output Box' control to send two large columns of signals, and creating a signal in each column according to the GB/T27930 rule;
a3, associating the message signals and system variables in the database with corresponding controls;
and (3) analyzing multi-packet data: when the transmission signal data exceeds 8 bytes in the charging process, certain specifications are required to be adopted for analysis, the charging parameters are ensured to be displayed completely and accurately, and the method specifically comprises the following steps:
b1, finding out signals with the signal length smaller than 8 bits and larger than 8 bits;
b2, analyzing the signal with the length less than 8 bits, and adopting the analysis formula as follows: the digital quantity resolution plus the offset is an actual value, the actual value is assigned to a corresponding system variable, the system variable is associated with a corresponding control of the Panel, and the actual value can be directly displayed;
b3, analyzing the signal with length larger than 8 bit signal, placing the high bit of CAN signal at the high bit of high byte, placing the low bit of signal at the low bit of low byte, analyzing and arranging oppositely, the high byte is at the front, the low byte is at the back, obtaining the actual value according to the analyzing formula in the step B2 after arranging, and assigning to the corresponding system variable;
second, estimate total energy of the battery: when the SOC is less than 20% or the SOC is more than 90%, estimating the total energy of the battery by adopting an ampere-hour integration method, correcting by using an open-circuit voltage method, and when the SOC is in a region of 20% -90%, estimating the total energy of the battery by adopting the ampere-hour integration method; the specific steps for estimating the total energy of the battery are as follows:
c1, designing a measuring key by using a 'Switch/Indicator' control of 'Panel Editor', and reading the nominal total energy W and the nominal capacity C of the power battery in the BMS sending information when the key is pressedNSOC, reading the voltage v in the information sent by the chargerBOThe current I output value, and the current SOC value is recorded as SOC0Considering that the resolution of the SOC value is 1%, if the first-time collected SOC is directly used to start ampere-hour integration, a large error is caused, so the SOC is designed to be equal to the SOC0When the SOC value is increased by 5%, namely the SOC is equal to the SOC, the charging capacity is calculated0When the battery total energy reaches + 6%, estimating actually measured battery energy and an energy difference value according to the battery total energy estimation method;
c2, the pure electric commercial vehicle adopts a charger to charge for a period of time, and a Switch/Indicator button is pressed;
and C3, obtaining the estimated and measured battery energy and the energy difference.
5. The charging monitoring method for the pure electric commercial vehicle according to claim 4, wherein the ampere-hour integral method formula is as follows:
Figure FDA0002974276260000031
in the formula: cNIs rated capacity; i is the battery current; SOC0Is in a charge-discharge initial state; w is the battery energy; a is the open circuit voltage when the battery is fully charged;
the open circuit voltage method formula is as follows:
Figure FDA0002974276260000032
in the formula: v. ofBOAn open circuit voltage for the battery; a is the open circuit voltage when the battery is fully charged; b is the open circuit voltage after the battery is fully discharged.
CN202110270736.0A 2021-03-12 2021-03-12 Charging monitoring system and method for pure electric commercial vehicle Pending CN112874382A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113859032A (en) * 2021-08-23 2021-12-31 上海融和智电新能源有限公司 Novel replaceable battery system
CN116811660A (en) * 2023-08-30 2023-09-29 中亿(深圳)信息科技有限公司 Battery detection method and system based on new energy charging pile

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113859032A (en) * 2021-08-23 2021-12-31 上海融和智电新能源有限公司 Novel replaceable battery system
CN116811660A (en) * 2023-08-30 2023-09-29 中亿(深圳)信息科技有限公司 Battery detection method and system based on new energy charging pile
CN116811660B (en) * 2023-08-30 2023-11-24 中亿(深圳)信息科技有限公司 Battery detection method and system based on new energy charging pile

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