CN105823957B - Electric automobile direct current interface connection state and communication performance test system that charges - Google Patents
Electric automobile direct current interface connection state and communication performance test system that charges Download PDFInfo
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- CN105823957B CN105823957B CN201610107269.9A CN201610107269A CN105823957B CN 105823957 B CN105823957 B CN 105823957B CN 201610107269 A CN201610107269 A CN 201610107269A CN 105823957 B CN105823957 B CN 105823957B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0817—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking functioning
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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
- Y02T90/167—Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
- Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
- Y04S30/12—Remote or cooperative charging
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Abstract
The invention discloses a system for testing the connection state and the communication performance of a direct-current charging interface of an electric automobile, belonging to the technical field of electric automobile charging facility application. The system comprises a test system socket, a test system plug, a test mode switching circuit, a first relay group (1), a second relay group (2), a control acquisition board, a first CAN test unit (I), a second CAN test unit (II) and an upper computer. The invention can complete the non-vehicle charger charging interface test mode, the electric vehicle charging interface test mode and the communication performance test mode when the non-vehicle charger is normally connected with the electric vehicle, can judge whether the charging interface connection and the internal circuit are normal one by one, and simultaneously comprehensively evaluates the communication performance of the direct current charging interface of the electric vehicle. The system greatly reduces the workload of daily maintenance and construction acceptance of the electric automobile during charging, and is favorable for popularization and application of the electric automobile.
Description
Technical Field
The invention belongs to the technical field of electric vehicle charging facility application, and particularly relates to a system for testing the connection state and the communication performance of a direct-current charging interface of an electric vehicle. The direct-current charging interface of the electric automobile comprises a vehicle plug (charging gun) of an off-board charger (charging pile) and a test system for judging the connection state of a vehicle socket of the electric automobile and comprehensively evaluating the communication performance.
Background
The general targets of the development of the charging infrastructure in the thirteen-five stages in China are provided by the guidance (2015-2020) of the charging infrastructure of the electric automobile jointly issued by the national institute of energy, the Ministry of industry and communications and the Ministry of residence in the system and the guidance (opinion) about accelerating the construction of the charging infrastructure of the electric automobile issued by the office of the State department. In the thirteen-five period, the development of charging infrastructure in China aims to build 1.2 ten thousand seats of a centralized charging and replacing power station and 480 ten thousand dispersed charging piles by 2020, so that the charging requirement of 500 ten thousand electric vehicles in China is met.
Since the industry of electric vehicles rises to the present, the research on key technologies is rapidly advanced, but a complete set of technical requirements and a technical detection system are not provided yet, and the research work for developing the charging test technology of the electric vehicles and the electric vehicles is imperative. The departments such as the national quality control bureau, the national standards committee united national energy agency, the ministry of industry and communications, the ministry of science and technology release 5 national standards such as newly revised electric automobile charging interface and communication protocol, and formally execute in 2016, 1, a month, and the like, and comprise: GB18487.1-2015 "electric vehicle conduction charging system — part 1: general requirements (U.S.); GB 20234.1-2015 "connection device for electric vehicle conduction charging — part 1: general requirements (U.S.); GB 20234.2-2015 "connection device for electric vehicle conduction charging — part 2: an alternating current charging interface; GB 20234.3-2015 "connection device for electric vehicle conduction charging — part 3: direct current charging interface "; GB 27930-. The popularization and implementation of the new national standard effectively solve the problems of compatibility and safety of the charging pile and promote the synchronous matching development of the vehicle and the pile.
According to the regulations of GB18487.1-2015 and GB 20234.3-2015, a typical direct-current charging interface is 9 contacts of an off-board charger vehicle plug, namely a charging gun and an electric vehicle socket, wherein any one of the contacts cannot be charged without being successfully connected, and no matter which fault condition exists, the off-board charger and the electric vehicle cannot judge which contact is abnormal to cause a charging fault, and even the fact that the off-board charger vehicle plug, namely a charging gun side contact is abnormal or an electric vehicle socket side contact is abnormal cannot be determined. Along with the large-scale construction and application of electric automobile charging facilities, the problem of the charging interface connection of the electric automobile conduction charging connection device will be increasingly prominent, and the main embodiment is as follows: 1. after the construction of the charging facility is completed, basic connection test and communication test are required to be carried out on the charging pile when the charging facility is received; 2. in the daily charging process of the electric automobile, if charging is abnormal, how to judge the problem of a charging pile side vehicle plug or the problem of an electric automobile side vehicle socket. If the two problems can be solved under the condition that the vehicle plug of the non-vehicle-mounted charger or the charging pile to be tested, namely the charging gun, and the vehicle socket of the electric automobile to be tested are intact, namely the charging gun and the electric automobile to be tested are not broken, the workload in the daily maintenance of the electric automobile charging and the construction and acceptance of the charging facility is greatly reduced, and the large-scale popularization and application of the electric automobile are facilitated.
Disclosure of Invention
The invention aims to provide a system for testing the connection state and the communication performance of a direct-current charging interface of an electric automobile, which is characterized by comprising a testing system socket and a testing system plug;
the testing system socket is connected with a left interface of the testing mode switching circuit and the first relay group (1), the testing mode switching circuit and the first relay group (1) are connected with the control acquisition board, the control acquisition board is connected with the upper computer, and the upper computer is connected with a contact charging communication CAN _ H (S +) of the non-vehicle-mounted charger testing system socket and the electric vehicle testing system plug through a first CAN testing unit (I); the first relay set (1) and the second relay set (2) are connected in a bidirectional mode.
The test system plug is connected with a right interface of the test mode switching circuit and the second relay set (2), the test mode switching circuit and the second relay set (2) are connected with the control acquisition board, the control acquisition board is connected with the upper computer, and the upper computer is respectively connected with a non-vehicle-mounted charger test system socket and a contact charging communication CAN _ L (S-) of the electric vehicle test system plug through the second CAN test unit (II).
The off-board charger test system socket and the corresponding vehicle plug are provided with 9 same contacts, wherein the 9 contacts are sequentially a direct-current power supply positive (DC +), a direct-current power supply negative (DC-), a protection ground (PE), a charging communication CAN _ H (S +) and a charging communication CAN _ L (S-), a first charging connection confirmation (CC1), a second charging connection confirmation (CC2), a low-voltage auxiliary power supply positive (A +), and a low-voltage auxiliary power supply negative (A-), from top to bottom.
The test mode switching power supplyThe circuit has two groups of left and right switching pins, the left 9 pins and 9 pins ① - ⑨ of the first relay group 1 are correspondingly connected to 9 contacts of the test system socket, and the right 9 pins and 9 pins of the second relay group 2
9 contacts correspondingly connected together to the test system plug; 9 contacts of a vehicle plug of the non-vehicle-mounted charger to be tested correspond to 9 contacts of the test system socket; and 9 contacts of the vehicle socket of the electric automobile to be tested correspond to 9 contacts of the test system plug.
The control acquisition board consists of a logic control module, a non-vehicle-mounted charger charging interface test circuit and an electric vehicle charging interface test circuit; the logic control module respectively controls the test mode switching circuit and the switching on or off of the first relay set 1 and the second relay set 2.
The upper computer is composed of a data analysis processing module, a man-machine interaction module and a test result display module, wherein the data analysis processing module comprises insulation evaluation, guidance judgment, auxiliary power supply judgment, communication evaluation and direct current judgment.
When the direct-current charging interface connection state and communication performance testing system of the electric automobile works, the testing system socket is connected with the vehicle plug of the non-vehicle-mounted charger to be tested, the testing system plug is connected with the vehicle socket of the electric automobile to be tested, and under the condition that the vehicle plug of the non-vehicle-mounted charger to be tested and the testing system socket of the electric automobile to be tested are intact, three testing modes can be completed: the method comprises a non-vehicle-mounted charger charging interface test mode, an electric vehicle charging interface test mode and a communication performance test mode when the non-vehicle-mounted charger is normally connected with an electric vehicle.
The non-vehicle-mounted charger charging interface test mode is characterized in that a test mode switching circuit is disconnected, a first relay group 1 is closed, a second relay group 2 is disconnected, the non-vehicle-mounted charger charging interface test circuit is connected with a vehicle plug of the non-vehicle-mounted charger to be tested through the first relay group 1, 9 contacts of the vehicle plug of the non-vehicle-mounted charger to be tested are subjected to one-by-one connection test, the connection condition of each contact of the vehicle plug of the non-vehicle-mounted charger to be tested is determined according to a test result, whether the internal circuit of the vehicle plug of the non-vehicle-mounted charger to be tested is normal or not and whether the insulation judgment on a direct-current power supply positive (DC +), a direct-current power supply negative (DC-) is correct or not is further judged, and meanwhile, the consistency; wherein, off-board charger controller is GB18487.1-2015 "electric automobile conduction charging system-part 1: the non-vehicle charger inherent part shown in the figure B.1 in the general requirements regulation.
The electric vehicle charging interface test mode is characterized in that a test mode switching circuit is disconnected, a first relay group 1 is disconnected, a second relay group 2 is closed, the electric vehicle charging interface test circuit is connected with a vehicle socket of an electric vehicle to be tested through the second relay group 2, 9 contacts of the vehicle socket of the electric vehicle to be tested are subjected to one-by-one connection test, the connection condition of each contact of the vehicle socket of the electric vehicle to be tested is determined according to a test result, whether the internal circuit of the vehicle socket of the electric vehicle to be tested is normal or not and whether the insulation judgment of a direct current power supply positive (DC +), a direct current power supply negative (DC-) is correct or not is further judged, and meanwhile, the consistency and the real-time performance of BMS communication messages in the electric vehicle controller are tested and evaluated; wherein, electric automobile vehicle controller is GB18487.1-2015 electric automobile conduction charging system-part 1: general requirements the drawing b.1 is an electric vehicle-specific part.
The communication performance test mode when the off-board charger is normally connected with the electric automobile means that a vehicle plug of the off-board charger to be tested is normally connected with a vehicle socket of the electric automobile to be tested, namely 9 contacts are communicated, so that the communication performance test between the off-board charger to be tested and the electric automobile to be tested is completed, wherein a first CAN test unit I completes signal acquisition of levels among a charging communication CAN _ H (S +) ground level, a charging communication CAN _ L (S-) ground level, a charging communication CAN _ H (S +) and a charging communication CAN _ L (S-); and the second CAN test unit II finishes the acquisition of CAN bus communication signals, and main test indexes comprise a bus load rate test, a message real-time test, a message consistency test and a message error rate test, so that the comprehensive evaluation on the communication performance of the DC charging interface of the electric automobile is realized.
When the electric automobile direct-current charging interface connection state and communication performance test system is in a non-vehicle-mounted charger charging interface test mode, 9 pins of a non-vehicle-mounted charger charging interface test circuit are correspondingly connected with 9 contacts of a non-vehicle-mounted charger vehicle plug to be tested through pins ① - ⑨ of a first relay group 1, namely pin ① is connected with a direct-current power supply positive (DC +), pin ② is connected with a direct-current power supply negative (DC-), pin ③ is connected with a protection ground (PE), pin ④ is connected with a charging communication CAN _ H (S +), pin ⑤ is connected with a charging communication CAN _ L (S-), pin ⑥ is connected with a first charging connection confirmation (CC1), pin ⑦ is connected with a second charging connection confirmation (CC2), pin ⑧ is connected with a low-voltage auxiliary power supply positive (A +), pin ⑨ 0 is connected with a low-voltage auxiliary power supply negative (A-), and switch S is connected with a switch S11And a sampling resistor R1Connected in series between pin ① and pin ③ as a positive (DC +) ground isolation test circuit for DC power supply, and switch S2And a sampling resistor R2Connected in series between the pin ② and the pin ③ as a negative (DC-) ground insulation test circuit for DC power supply, the pin ① passing through a sampling resistor R4Digital potentiometer R3And a sampling resistor R5Is connected with a pin ② as a judgment circuit of the positive (DC +) and negative (DC-) connection states of the DC power supply, wherein a sampling point AD1 samples a digital potentiometer R3Center tap and sampling resistor R5Voltage at one end, pin ③ through sampling resistor R6And a sampling resistor R7Connected in series and then connected with a DC voltage source U1Series connected as test circuits for Protection of Earth (PE) connections, with sampling points AD2At a sampling resistor R6And a sampling resistor R7The pins ④ and ⑤ are directly connected to a virtual BMS module as a charging communication CAN _ H (S +) and a charging communication CAN _ L (S-) connection state test circuit, wherein the sampling point AD is provided3、AD4At pin ④ and pin ⑤, respectively, pin ⑥ passing through a sampling resistor R8Connected to ground as a first charging connection confirmation (CC1) connectionTest circuits in connected state, in which the sampling points AD5At pin ⑥, pin ⑦ through a sampling resistor R9And a DC voltage source U2Connected in series as a second charging connection confirmation (CC2) connection state test circuit, wherein the sampling point AD6At pin ⑦, pin ⑧ through a sampling resistor R10Series sampling resistor R11Then connected to pin ⑨, pin ⑨ connected to ground, as a low voltage auxiliary power supply positive (A +) and low voltage auxiliary power supply negative (A-) connection status test circuit, wherein the sampling point AD is7At a sampling resistor R10And a sampling resistor R11At the connection node of (a); wherein, the sampling resistor R1、R2Are all 20k omega, and a sampling resistor R4、R5、R6、R7、R8、R9、R10And R11Are all 1k omega, R3A 1k omega digital potentiometer, a DC voltage source U1＝U2＝12V。
When the direct-current charging interface connection state and communication performance testing system of the electric automobile is in the electric automobile charging interface testing mode, 9 pins of the electric automobile charging interface testing circuit pass through the pins of the second relay group 2Is connected with 9 contacts of the socket of the electric automobile to be tested, namely a pin ⑩ is connected with a negative (A-) of a low-voltage auxiliary power supply, and the pinIs connected with a positive (A +) of a low-voltage auxiliary power supply and a pin
Is connected with a second charging connection confirmation interface (CC2) and a pin
Connected to a first charging connection confirmation (CC1), pinAnd charging deviceSignal CAN _ L (S-) is connected with a pin
Is connected with a charging communication CAN _ H (S +), and a pin
Connected to a Protective Earth (PE), pinPin connected with negative (DC-) of DC power supply
Connected to the positive (DC +) of the DC power supply, pin ⑩ is directly connected to ground, and pin
Through the sampling resistance R12And a DC voltage source U3In series, switch S3Is connected in parallel with the sampling resistor R12Two ends of the testing circuit are used as a positive (A +) low-voltage auxiliary power supply and a negative (A-) low-voltage auxiliary power supply to be connected with a state testing circuit, wherein a sampling point AD8At the pinAt least one of (1) and (b); pinThrough the sampling resistance R13And a DC voltage source U4Connected in series as a second charging connection confirmation (CC2) connection state test circuit, wherein the sampling point AD9At the pin
At least one of (1) and (b); pin
Through the sampling resistance R14Connected to ground as a first charging connection confirmation (CC1) connection state test circuit, wherein the sampling point AD10At the pin
At least one of (1) and (b); pin
PinAre respectively and directly connected with the communication module of the virtual off-board charger to be used as a charging communication CAN _ H (S +), a charging communication CAN _ L (S-) connection state test circuit, wherein the sampling point AD11、AD12Are respectively arranged on the pins
And a pinAt least one of (1) and (b); pin
Through the sampling resistance R16And a sampling resistor R17Connected in series and then connected with a DC voltage source U5Series connected as test circuits for Protection of Earth (PE) connections, with sampling points AD13At a sampling resistor R16And a sampling resistor R17A joint; switch S4And a sampling resistor R20Connected in series and then connected at the pinAnd a pin
The test circuit is used as a direct current power supply positive (DC +) ground insulation test circuit; switch S5And a sampling resistor R21Connected in series and then connected at the pin
And a pin
As a negative (DC-) ground insulation test of a DC power supplyA way; pinThrough the sampling resistance R17Digital potentiometer R19And a sampling resistor R18And pin
Connected as a decision circuit of the positive (DC +) and negative (DC-) connection states of the DC power supply, wherein the sampling point AD14Sampling digital potentiometer R19Center tap and sampling resistor R18A voltage at one end; wherein, the sampling resistor R20、R21Are all 20k omega, R12、R13、R14、R15、R16、R17And R18Are all 1k omega, digital potentiometer R191k Ω, a dc voltage source U3＝U4＝U5＝12V。
The invention has the advantages that the problems of pin connection state judgment and communication performance test of the direct current charging interface of the electric automobile in practical application are solved, and the practical application significance is as follows: when the charging interface fails to be connected and cannot be charged, the connection state test can be carried out on a vehicle plug (a charging gun) of the off-board charger and a vehicle socket of the electric vehicle, and the contact with the problem of connection is confirmed; in addition, the communication performance of the off-board charger or the BMS of the electric automobile is tested, and the communication performance of the tested communication system can be intuitively and clearly evaluated according to the test result. The invention has great application value for the operation, maintenance and overhaul of the direct current charging interface and the communication system of the electric automobile and the construction acceptance work of the related electric automobile charging facilities.
Drawings
Fig. 1 is a schematic block diagram of a system for testing the connection state and the communication performance of a direct-current charging interface of an electric vehicle.
Fig. 2 is a test pattern diagram of a charging interface of the off-board charger.
FIG. 3 is a diagram of a test pattern of a charging interface of an electric vehicle.
Fig. 4 shows a communication performance test mode when the off-board charger is normally connected with the electric vehicle (9 contacts are both communicated).
Detailed Description
The invention provides a system for testing the connection state and the communication performance of a direct-current charging interface of an electric automobile, which is described in the following with reference to the attached drawings.
Fig. 1 is a schematic block diagram of a system for testing the connection state and the communication performance of a direct-current charging interface of an electric vehicle. According to GB18487.1-2015 "electric vehicle conduction charging system — part 1: general requirements and GB 20234.3-2015 "connection device for conductive charging of electric vehicles — part 3: the DC charging interface provides detailed regulations on the DC charging interface of the electric automobile and a guide circuit thereof. According to GB18487.1-2015 and GB 20234.3-2015, a typical DC charging interface is 9 contacts of a non-vehicle charger vehicle plug, i.e., a charging gun and a socket of an electric vehicle, as shown in fig. 1, the test system socket and the test system plug have 9 contacts which are the same, and the 9 contacts are, from top to bottom, a DC power positive (DC +), a DC power negative (DC-), a protection ground (PE), a charging communication CAN _ H (S +) and a charging communication CAN _ L (S-), a charging connection confirmation (CC1), a charging connection confirmation (CC2), a low voltage auxiliary power positive (a +), and a low voltage auxiliary power negative (a-).
The electric vehicle direct-current charging interface performance test system shown in fig. 1 comprises a test system socket and a test system plug;
the testing system socket is connected with a left interface of the testing mode switching circuit and the first relay group (1), the testing mode switching circuit and the first relay group (1) are connected with the control acquisition board, the control acquisition board is connected with the upper computer, and the upper computer is connected with a contact charging communication CAN _ H (S +) of the non-vehicle-mounted charger testing system socket and the electric vehicle testing system plug through a first CAN testing unit (I); the first relay set (1) and the second relay set (2) are connected in a bidirectional mode.
The test system plug is connected with a right interface of the test mode switching circuit and the second relay set (2), the test mode switching circuit and the second relay set (2) are connected with the control acquisition board, the control acquisition board is connected with the upper computer, and the upper computer is respectively connected with a non-vehicle-mounted charger test system socket and a contact charging communication CAN _ L (S-) of the electric vehicle test system plug through the second CAN test unit (II).
When the test system is used for testing, the test system socket is connected with a vehicle plug, namely a charging gun, of the non-vehicle-mounted charger to be tested, and the test system plug is connected with a vehicle socket of the electric vehicle to be tested.
FIG. 2 is a diagram showing a charging interface test mode of the non-vehicle-mounted charger, wherein a test mode switching circuit is disconnected, a first relay group 1 is closed, a second relay group 2 is disconnected, 9 pins of the charging interface test circuit of the non-vehicle-mounted charger are correspondingly connected with 9 contacts of a vehicle plug of the non-vehicle-mounted charger to be tested through pins ① - ⑨ of the first relay group 1, the 9 contacts of the vehicle plug of the non-vehicle-mounted charger to be tested are connected one by one, the connection condition of each contact of the vehicle plug of the non-vehicle-mounted charger to be tested is determined according to the test result, whether the internal circuit of the vehicle plug of the non-vehicle-mounted charger to be tested is normal or not and whether the insulation judgment of a direct current power supply positive (DC +), a direct current power supply negative (DC-) is correct or not1＝R220k Ω, sampling resistor R4、R5、R6、R7、R8、R9、R10And R11Are all 1k omega, U1＝U2＝12V，R3A digital potentiometer of 1k omega. The detailed test is as follows:
(1) high-precision digital potentiometer R5The sampling resistance value can be dynamically configured according to the rated output voltage (72V-750V) of the non-vehicle charger to be tested, and further the AD sampling point is realized1Accurate sampling, sampling point AD1Whether the potential is larger than zero can judge whether the direct current power supply positive (DC +) and the direct current power supply negative (DC-) are normally connected.
(2) When the Protection Earth (PE) connection is normal, the sampling point AD2The potential is 6V; when the protection grounding (PE) connection is abnormal, the sampling point AD2Potential 12V, sampling point AD2The potential can judge whether the protection grounding (PE) is normally connected.
(3) Virtual BMS (Battery management System) Module CAN be based on CAN busJudging whether the charging communication CAN _ H (S +) and the charging communication CAN _ L (S-) are normally connected or not according to the condition of the line message, and simultaneously, sampling points AD3And sampling point AD4Whether the charging communication CAN _ H (S +) level to ground, the charging communication CAN _ L (S-) level to ground and the level between the charging communication CAN _ H (S +) and the charging communication CAN _ L (S-) meet the requirements CAN be judged; the first CAN testing unit I reads the communication message of the BMS module of the virtual battery management system and the non-vehicle-mounted charger controller, and the communication consistency and the real-time performance of the non-vehicle-mounted charger are evaluated through background data analysis processing.
(4) The first charging connection confirms (CC1) that the contact is connected normally, and the sampling point AD5The potential is 4V; if the first charging connection confirms (CC1) that the contact is not connected properly, the sampling point AD5The potential is 0V. Sampling point AD5The potential may determine whether the first charging connection confirmation (CC1) contact is connected normally.
(5) When the second charging connection confirms (CC2) that the contact is connected normally, the sampling point AD6The potential is 6V; when the second charging connection confirms that the CC2 contact is abnormally connected, the sampling point AD6The potential was 12V. Sampling point AD6The potential may determine whether the second charging connection confirms that the CC2 contacts are connected properly.
(6) When the positive (A +) and negative (A-) of the low-voltage auxiliary power supply are connected normally, the sampling point AD7The potential is 6V; when the positive (A +) and negative (A-) of the low-voltage auxiliary power supply are abnormally connected, the sampling point AD7The potential is 0V. Thereby passing through the sampling point AD7The potential can judge whether the positive (A +) of the low-voltage auxiliary power supply and the negative (A-) of the low-voltage auxiliary power supply are normally connected.
(7) If the charging communication CAN _ H (S +) and the charging communication CAN _ L (S-) are both connected normally, the switch S is closed1R is connected between a direct current power supply positive (DC +) and a protection ground (PE)1Reading insulation fault alarm information in a communication message of the communication module of the off-board charger through the virtual BMS module, and if the insulation fault alarm is carried out, indicating that the insulation judgment of the off-board charger is normal; and if the insulation fault does not give an alarm, indicating that the insulation judgment of the off-board charger is abnormal.
FIG. 3 shows an electric vehicleAnd testing a pattern diagram of the charging interface. When the electric automobile direct current charging interface connection state and communication performance test system is in an electric automobile charging interface test mode, the test mode switching circuit is disconnected, the first relay group 1 is disconnected, the second relay group 2 is closed, the electric automobile charging interface test circuit is connected with a vehicle socket of an electric automobile to be tested through the second relay group 2, 9 contacts of the vehicle socket of the electric automobile to be tested are subjected to one-by-one connection test, the connection condition of each contact of the vehicle socket of the electric automobile to be tested is determined according to a test result, and whether the internal circuit of the vehicle socket of the electric automobile to be tested is normal and whether the insulation judgment of a direct current power supply positive (DC +), and a direct current power supply negative (DC-) is correct is further judged. Specific circuit parameters: sampling resistor R20＝R2120k Ω, sampling resistor R12、R13、R14、R15、R16、R17And R18Are all 1k omega, U3＝U4＝ U5＝12V，R19A high-precision digital potentiometer of 1k omega. The detailed test is as follows:
(1) high-precision digital potentiometer R19The sampling resistance value can be dynamically configured according to the rated voltage (72V-750V) of the power battery pack of the tested electric automobile, and further the AD sampling point is realized14Accurate sampling, sampling point AD14Whether the potential is larger than zero can judge whether the direct current power supply positive (DC +) and the direct current power supply negative (DC-) are normally connected.
(2) When the Protection Earth (PE) connection is normal, the sampling point AD13The potential is 6V; when the protection grounding (PE) connection is abnormal, the sampling point AD13The potential is 12V; sampling point AD13The potential can judge whether the protection grounding (PE) is normally connected.
(3) The virtual off-board charger communication module CAN judge whether the charging communication CAN _ H (S +) and the charging communication CAN _ L (S-) are normally connected according to the CAN bus message condition, and simultaneously, a sampling point AD is used for judging whether the charging communication CAN _ H (S +) and the charging communication CAN _ L (S-) are normally connected or not11And sampling point AD12Whether the charging communication CAN _ H (S +) ground level and the charging communication CAN _ L (S-) ground level and the charging communication CAN _ H (S +) ground level and the charging communication CAN _ L (S-) ground level meet the requirements or not CAN be judged;and the second CAN testing unit II reads the communication messages of the virtual off-board charger communication module and a BMS (battery management system) module in the electric vehicle controller, and the communication messages are analyzed and processed through background data, so that the communication consistency and the real-time performance of the BMS module in the electric vehicle controller are evaluated.
(4) When the first charging connection confirms (CC1) that the contact is connected normally, the sampling point AD10The potential is 6V; when the first charging connection confirms (CC1) that the contact is connected normally, the sampling point AD10The potential was 12V. Sampling point AD10The potential may determine whether the first charging connection confirmation (CC1) contact is connected normally.
(5) When the second charging connection confirms (CC2) that the contact is connected normally, the sampling point AD9The potential is 6V; when the second charging connection confirms (CC2) that the contact connection is abnormal, the sampling point AD9The potential is 0V. Sampling point AD9The potential may determine whether the second charging connection confirmation (CC2) contact is connected normally.
(6) Switch S3When the low-voltage auxiliary power supply is disconnected and the positive (A +) and the negative (A-) of the low-voltage auxiliary power supply are connected normally, the sampling point AD8The potential is not equal to 12V; when the positive (A +) and negative (A-) of the low-voltage auxiliary power supply are abnormally connected, the sampling point AD8The potential is equal to 12V; sampling point AD8The potential can judge whether the positive (A +) of the low-voltage auxiliary power supply and the negative (A-) of the low-voltage auxiliary power supply are normally connected, and the switch S is closed after the judgment is finished3。
(7) If the charging communication CAN _ H (S +) and the charging communication CAN _ L (S-) are both connected normally, the switch S is closed5R is connected between a direct current power supply positive (DC +) and a protection ground (PE)21Reading insulation fault alarm information in a communication message of a vehicle controller of the electric vehicle through a virtual off-board charger communication module, and if the insulation fault alarm is carried out, indicating that the insulation judgment of the electric vehicle is normal; if the insulation fault does not alarm, the insulation judgment of the electric automobile is abnormal.
Fig. 4 shows a communication performance test mode when the off-board charger is normally connected to the electric vehicle. The communication performance test mode when the off-board charger is normally connected with the electric automobile is that a vehicle plug of the off-board charger to be tested is normally connected with a vehicle socket of the electric automobile to be tested, namely 9 contacts are all communicated, a test mode switching circuit is closed, meanwhile, a first relay group 1 is disconnected, a second relay group 2 is disconnected, and the vehicle plug of the off-board charger to be tested, namely a charging gun, is connected with the vehicle socket of the electric automobile to be tested, so that the normal work of the communication performance test between the off-board charger to be tested and the electric automobile to be tested is completed; the first CAN test unit I finishes signal acquisition of levels among a charging communication CAN _ H (S +) ground level, a charging communication CAN _ L (S-) ground level, a charging communication CAN _ H (S +) and a charging communication CAN _ L (S-); and the second CAN test unit II finishes the acquisition of CAN bus communication signals, and main test indexes comprise a bus load rate test, a message real-time test, a message consistency test and a message error rate test, so that the comprehensive evaluation on the communication performance of the DC charging interface of the electric automobile is realized.
By integrating the contents of the invention, the invention solves the problems of judging the connection state of each contact and testing the communication performance of the direct current charging interface of the electric automobile in practical application, and the practical application significance of the invention is as follows: when the charging interface fails to be connected and cannot be charged, the connection state of a vehicle plug of the non-vehicle-mounted charger, namely a charging gun and a vehicle socket of the electric vehicle, is tested, and the contact with the problem is confirmed to be connected; in addition, the communication performance of BMSs in the off-board charger controller and the electric vehicle controller is tested, and the test result can intuitively and clearly evaluate the communication performance of the tested communication system. The invention has great application value for the operation, maintenance and overhaul of the direct current charging interface and the communication system of the electric automobile and the construction acceptance work of the related electric automobile charging facilities.
Claims (3)
1. A system for testing the connection state and the communication performance of a direct-current charging interface of an electric automobile comprises a test system socket and a test system plug;
the testing system socket is connected with a left interface of the testing mode switching circuit and the first relay group (1), the testing mode switching circuit and the first relay group (1) are connected with the control acquisition board, the control acquisition board is connected with the upper computer, and the upper computer is connected with a contact charging communication CAN _ H (S +) of the non-vehicle-mounted charger testing system socket and the electric vehicle testing system plug through a first CAN testing unit (I); the first relay set (1) and the second relay set (2) are connected in a bidirectional mode;
the test system plug is connected with a right interface of the test mode switching circuit and the second relay group (2), the test mode switching circuit and the second relay group (2) are connected with the control acquisition board, the control acquisition board is connected with the upper computer, and the upper computer is respectively connected with a non-vehicle-mounted charger test system socket and a contact charging communication CAN _ L (S-) of the electric vehicle test system plug through a second CAN test unit (II);
the off-board charger test system socket and the corresponding vehicle plug as well as the electric vehicle test system socket and the corresponding vehicle plug are provided with 9 same contacts, wherein the 9 contacts are a direct current power supply positive (DC +), a direct current power supply negative (DC-), a protection ground (PE), a charging communication CAN _ H (S +) and a charging communication CAN _ L (S-), a first charging connection confirmation (CC1), a second charging connection confirmation (CC2), a low-voltage auxiliary power supply positive (A +), and a low-voltage auxiliary power supply negative (A-);
the test mode switching circuit comprises a left switching pin and a right switching pin, wherein the left 9 pins and the 9 pins ① - ⑨ of the first relay set (1) are correspondingly connected to 9 contacts of the test system socket, and the right 9 pins and the 9 pins ⑩ of the second relay set (2)
9 contacts correspondingly connected together to the test system plug; 9 contacts of a vehicle plug of the non-vehicle-mounted charger to be tested correspond to 9 contacts of the test system socket; 9 contacts of a vehicle socket of the electric vehicle to be tested correspond to 9 contacts of the test system plug; it is characterized in that the preparation method is characterized in that,
the control acquisition board consists of a logic control module, a non-vehicle-mounted charger charging interface test circuit and an electric vehicle charging interface test circuit; the logic control module respectively controls the test mode switching circuit and the first relay set (1) and the second relay set (2) to be switched on or off;
the upper computer is composed of a data analysis processing module, a man-machine interaction module and a test result display module, wherein the data analysis processing module comprises insulation evaluation, guidance judgment, auxiliary power supply judgment, communication evaluation and direct current judgment;
when the direct-current charging interface connection state and communication performance testing system of the electric automobile works, the testing system socket is connected with the vehicle plug of the non-vehicle-mounted charger to be tested, the testing system plug is connected with the vehicle socket of the electric automobile to be tested, and under the condition that the vehicle plug of the non-vehicle-mounted charger to be tested and the testing system socket of the electric automobile to be tested are intact, three testing modes can be completed: the method comprises the following steps of (1) testing a charging interface of the non-vehicle-mounted charger in a mode, testing a charging interface of the electric automobile in a mode, and testing communication performance of the non-vehicle-mounted charger when the non-vehicle-mounted charger is normally connected with the electric automobile in a mode;
the off-board charger charging interface test mode is characterized in that a test mode switching circuit is disconnected, a first relay group (1) is closed, a second relay group (2) is disconnected, the off-board charger charging interface test circuit is connected with a vehicle plug of an off-board charger to be tested through the first relay group (1), 9 contacts of the vehicle plug of the off-board charger to be tested are connected one by one and tested, the connection condition of each contact of the vehicle plug of the off-board charger to be tested is determined according to a test result, whether an internal circuit of the vehicle plug of the off-board charger to be tested is normal or not and whether insulation judgment of a direct current power supply positive (DC +), a direct current power supply negative (DC-) is correct or not is further judged, and meanwhile, consistency and real-time performance of communication messages of a controller of the off-board charger are tested and; wherein, off-board charger controller is GB18487.1-2015 "electric automobile conduction charging system-part 1: the non-vehicle charger inherent part shown in a diagram B.1 in the regulation of general requirements;
the electric vehicle charging interface test mode is characterized in that a test mode switching circuit is disconnected, a first relay group (1) is disconnected, a second relay group (2) is closed, the electric vehicle charging interface test circuit is connected with a vehicle socket of an electric vehicle to be tested through the second relay group (2), 9 contacts of the vehicle socket of the electric vehicle to be tested are subjected to one-by-one connection test, the connection condition of each contact of the vehicle socket of the electric vehicle to be tested is determined according to a test result, whether the internal circuit of the vehicle socket of the electric vehicle to be tested is normal or not and whether the insulation judgment of a direct current power supply positive (DC +), a direct current power supply negative (DC-) is correct or not is further judged, and meanwhile, the consistency and the real-time performance of BMS communication messages in an electric vehicle controller are tested and evaluated; wherein, electric automobile vehicle controller is GB18487.1-2015 electric automobile conduction charging system-part 1: figure b.1 electric vehicle intrinsic components in the general requirements specification;
the communication performance test mode when the off-board charger is normally connected with the electric automobile means that a vehicle plug of the off-board charger to be tested is normally connected with a vehicle socket of the electric automobile to be tested, namely 9 contacts are communicated, so that the communication performance test between the off-board charger to be tested and the electric automobile to be tested is completed, wherein the first CAN test unit (I) completes signal acquisition of levels among a charging communication CAN _ H (S +) ground level, a charging communication CAN _ L (S-) ground level, a charging communication CAN _ H (S +) and a charging communication CAN _ L (S-); and the second CAN test unit (II) finishes the acquisition of CAN bus communication signals, and main test indexes comprise a bus load rate test, a message real-time test, a message consistency test and a message error rate test, so that the comprehensive evaluation of the communication performance of the direct current charging interface of the electric automobile is realized.
2. The system for testing the connection status and the communication performance of the DC charging interface of the electric vehicle as claimed in claim 1, wherein when the system for testing the connection status and the communication performance of the DC charging interface of the electric vehicle is in the off-board charger charging interface test mode, 9 pins of the off-board charger charging interface test circuit are correspondingly connected with 9 contacts of the vehicle plug of the off-board charger to be tested through the pins ① - ⑨ of the first relay set (1), i.e. the pin ① is connected with the positive (DC +) of the DC power supply, the pin ② is connected with the negative (DC-) of the DC power supply, the pin ③ is connected with the protection ground (PE), the pin ④ is connected with the charging communication CAN _ H (S +), the pin ⑤ is connected with the charging communication CAN _ L (S-), and the pin ⑥ is connected with the first charging communication CAN _ LA connection confirmation (CC1), a pin ⑦ connected to a second charging connection confirmation (CC2), a pin ⑧ connected to the positive (A +) of the low voltage auxiliary power supply, a pin ⑨ connected to the negative (A-) of the low voltage auxiliary power supply, a switch S1And a sampling resistor R1Connected in series between pin ① and pin ③ as a positive (DC +) ground isolation test circuit for DC power supply, and switch S2And a sampling resistor R2Connected in series between the pin ② and the pin ③ as a negative (DC-) ground insulation test circuit for DC power supply, the pin ① passing through a sampling resistor R4Digital potentiometer R3And a sampling resistor R5Is connected with a pin ② as a judgment circuit of the positive (DC +) and negative (DC-) connection states of the DC power supply, wherein a sampling point AD1 samples a digital potentiometer R3Center tap and sampling resistor R5Voltage at one end, pin ③ through sampling resistor R6And a sampling resistor R7Connected in series and then connected with a DC voltage source U1Series connected as test circuits for Protection of Earth (PE) connections, with sampling points AD2At a sampling resistor R6And a sampling resistor R7The pin ④ and the pin ⑤ are respectively and directly connected with the BMS module as a charging communication CAN _ H (S +) and a charging communication CAN _ L (S-) connection state test circuit, wherein the sampling point AD is3、AD4At pin ④ and pin ⑤, respectively, pin ⑥ passing through a sampling resistor R8Connected to ground as a first charging connection confirmation (CC1) connection state test circuit, wherein the sampling point AD5At pin ⑥, pin ⑦ through a sampling resistor R9And a DC voltage source U2Connected in series as a second charging connection confirmation (CC2) connection state test circuit, wherein the sampling point AD6At pin ⑦, pin ⑧ through a sampling resistor R10Series sampling resistor R11Then connected to pin ⑨, pin ⑨ connected to ground, as a low voltage auxiliary power supply positive (A +) and low voltage auxiliary power supply negative (A-) connection status test circuit, wherein the sampling point AD is7At a sampling resistor R10And a sampling resistor R11At the connection node of (a); wherein, the sampling resistor R1、R2Are all 20k omega, and a sampling resistor R4、R5、R6、R7、R8、R9、R10And R11Are all 1k omega, R3A 1k omega digital potentiometer, a DC voltage source U1＝U2＝12V。
3. The system for testing the connection status and the communication performance of the DC charging interface of the electric vehicle as claimed in claim 1, wherein when the system for testing the connection status and the communication performance of the DC charging interface of the electric vehicle is in the test mode of the charging interface of the electric vehicle, 9 pins of the test circuit of the charging interface of the electric vehicle pass through the pin ⑩ of the second relay set (2)
Is connected with 9 contacts of the socket of the electric automobile to be tested, namely a pin ⑩ is connected with a negative (A-) of a low-voltage auxiliary power supply, and the pin
Is connected with a positive (A +) of a low-voltage auxiliary power supply and a pinConnected to a second charging connection confirmation (CC2), pinConnected to a first charging connection confirmation (CC1), pin
Connected with charging communication CAN _ L (S-), and pin
Is connected with a charging communication CAN _ H (S +), and a pin
Connected to a Protective Earth (PE), pin
Pin connected with negative (DC-) of DC power supply
Connected to the positive (DC +) of the DC power supply, pin ⑩ is directly connected to ground, and pin
Through the sampling resistance R12And a DC voltage source U3In series, switch S3Is connected in parallel with the sampling resistor R12Two ends of the testing circuit are used as a positive (A +) low-voltage auxiliary power supply and a negative (A-) low-voltage auxiliary power supply to be connected with a state testing circuit, wherein a sampling point AD8At the pin
At least one of (1) and (b); pin
Through the sampling resistance R13And a DC voltage source U4Connected in series as a second charging connection confirmation (CC2) connection state test circuit, wherein the sampling point AD9At the pin
At least one of (1) and (b); pin
Through the sampling resistance R14Connected to ground as a first charging connection confirmation (CC1) connection state test circuit, wherein the sampling point AD10At the pin
At least one of (1) and (b); pin
Pin
Are respectively and directly connected with the communication module of the virtual off-board charger to be used as a charging communication CAN _ H (S +), a charging communication CAN _ L (S-) connection state test circuit, wherein the sampling point AD11、AD12Are respectively arranged on the pins
And a pin
At least one of (1) and (b); pin
Through the sampling resistance R16And a sampling resistor R17Connected in series and then connected with a DC voltage source U5Series connected as test circuits for Protection of Earth (PE) connections, with sampling points AD13At a sampling resistor R16And a sampling resistor R17A joint; switch S4And a sampling resistor R20Connected in series and then connected at the pin
And a pin
The test circuit is used as a direct current power supply positive (DC +) ground insulation test circuit; switch S5And a sampling resistor R21Connected in series and then connected at the pin
And a pin
As a direct current power supply negative (DC-) ground insulation test circuit; pin
Through the sampling resistance R17Digital potentiometer R19And a sampling resistor R18And pin
Connected as a decision circuit of the positive (DC +) and negative (DC-) connection states of the DC power supply, wherein the sampling point AD14Sampling digital potentiometer R19Center tap and sampling resistor R18A voltage at one end; wherein, the sampling resistor R20、R21Are all 20k omega, R12、R13、R14、R15、R16、R17And R18Are all 1k omega, digital potentiometer R191k Ω, a dc voltage source U3＝U4＝U5＝12V。
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