CN113866507B - Direct-current impedance testing method for charging pile - Google Patents
Direct-current impedance testing method for charging pile Download PDFInfo
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- CN113866507B CN113866507B CN202110986814.7A CN202110986814A CN113866507B CN 113866507 B CN113866507 B CN 113866507B CN 202110986814 A CN202110986814 A CN 202110986814A CN 113866507 B CN113866507 B CN 113866507B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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Abstract
The invention provides a direct current impedance testing method of a charging pile in the technical field of electric automobiles, which comprises the following steps: step S10, setting a first current and a second current, and further controlling the charging and discharging of the charging pile to acquire first charging and discharging data; step S20, calculating charging gun output impedance, initial charging gun contact impedance and initial DCR based on the first charging and discharging data; step S30, performing fault self-checking based on the output impedance of the charging gun, the contact impedance of the initial charging gun and the initial DCR; step S40, setting a third current, a fourth current, a current threshold value and a charge-discharge multiplying power; step S50, based on a constant voltage mode, controlling the charging pile to charge and discharge by using a third current, a fourth current, a current threshold value and a charging and discharging multiplying power to acquire second charging and discharging data; step S60, calculating an actual DRC, an actual DCR deviation range, an actual charging gun contact impedance and an actual charging gun contact impedance deviation range based on the second charge-discharge data. The invention has the advantages that: the accuracy of the direct current impedance test is greatly improved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a direct current impedance testing method of a charging pile.
Background
Electric Vehicles (BEV) are vehicles which use a vehicle-mounted power supply as power and drive wheels by a motor to run, and meet various requirements of road traffic and safety regulations, and have a smaller influence on the environment than the traditional vehicles, so that the BEV has a wide prospect. With the development of electric vehicles, the charging demands of the electric vehicles are increasing, and the number of the charging piles is explosively increased.
In order to ensure the safety of charging an electric automobile, the electric automobile needs to be tested for direct current impedance (DCR, directive Current Resistance) by using a charging pile. Because charging stake to charging gun adopts 4 systems, charging gun to electric automobile adopts 2 systems, and normal direct current impedance test can test accuracy only with 4 lines, and direct current impedance test accuracy of traditional charging stake is not high promptly. If the output end of the charging gun is used for measuring the direct current impedance, the output impedance of the charging gun=the contact impedance of the charging gun+the internal power line impedance (negligible) of the battery of the electric vehicle) +the battery impedance of the electric vehicle, the accurate battery impedance cannot be obtained, and the charging safety of the electric vehicle is further affected.
Therefore, how to provide a method for testing the direct current impedance of the charging pile to improve the accuracy of the direct current impedance test becomes a problem to be solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a direct current impedance testing method for a charging pile, which can improve the accuracy of direct current impedance testing.
The invention is realized in the following way: a direct current impedance test method of a charging pile comprises the following steps:
step S10, setting a first current and a second current, and respectively controlling a charging pile to charge and discharge a battery of the electric automobile based on the first current and the second current to acquire first charge and discharge data;
step S20, calculating charging gun output impedance, initial charging gun contact impedance and initial DCR based on the first charging and discharging data;
step S30, performing fault self-checking based on the charging gun output impedance, the initial charging gun contact impedance and the initial DCR;
step S40, setting a third current, a fourth current, a current threshold and a charge-discharge multiplying power;
step S50, based on a constant voltage mode, respectively utilizing the third current, the fourth current, the current threshold value and the charge-discharge multiplying power to control the charge pile to charge and discharge the battery of the electric automobile, and obtaining second charge-discharge data;
and step S60, calculating an actual DRC, an actual DCR deviation range, an actual charging gun contact impedance and an actual charging gun contact impedance deviation range based on the second charge and discharge data, and completing the test of the direct current impedance.
Further, the step S10 specifically includes:
setting a first current and a second current, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the first current to obtain first charging and discharging data comprising a first pile end voltage Vilex, a first pile end current Ipilex and a first pile end voltage Vbmsx;
and based on the second current control charging pile, charging and discharging the battery of the electric automobile, and acquiring first charging and discharging data comprising a second pile end voltage Vpeiley, a second pile end current Ipile and a second car end voltage Vbmsy.
Further, the first pile end voltage Vpilex, the first pile end current Ipilex, the second pile end voltage Vpiley and the second pile end current Ipiley are read from the charging pile; the first terminal voltage Vbmsx and the second terminal voltage Vbmsy are read from the BMS of the electric vehicle through the CAN bus.
Further, in the step S20, the calculation formulas of the charging gun output impedance, the initial charging gun contact impedance, and the initial DCR are as follows:
Rout*＝(Vpilex-Vpiley)/(Ipilex-Ipiley)；
Rcontact*＝(Vbmsy-Vpiley)/Ipiley；
Rdcr*＝(Vbmsx-Vbmsy)/(Ipilex-Ipiley)；
where Rout denotes the gun output impedance, rcontact denotes the initial gun contact impedance, rdcr denotes the initial DCR.
Further, the step S30 specifically includes:
step S31, a first output impedance threshold, a second output impedance threshold, a contact impedance threshold and a DCR threshold are set; the first output impedance threshold is less than the second output impedance threshold;
step S32, judging whether the output impedance of the charging gun is larger than a first output impedance threshold value, if so, entering step S33; if not, go to step S34;
step S33, judging whether the output impedance of the charging gun is larger than a second output impedance threshold value, if so, ending the flow; if not, prompting that the output impedance is abnormal, and proceeding to step S34;
step S34, judging whether the contact impedance of the initial charging gun is larger than a contact impedance threshold, if so, prompting replacement of the charging pile, and ending the flow; if not, go to step S35;
step S35, judging whether the initial DCR is larger than a DCR threshold value, if so, prompting that the electric automobile is abnormal, and ending the flow; if not, the process proceeds to step S40.
Further, in the step S40, the third current has a value of a, which is the first current, the fourth current has a value of a, which is the second current, and the charge-discharge multiplying power has a value of bC; wherein the value ranges of a and b are (0, 1).
Further, the step S50 specifically includes:
step S51, setting a first constant voltage value during charging and a second constant voltage value during discharging, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the first constant voltage value, the second constant voltage value and a third current;
step S52, judging whether the charge and discharge current is smaller than the current threshold in the charge and discharge process, if yes, entering step S53; if not, go to step S52;
step S53, setting a third constant voltage value during charging and a fourth constant voltage value during discharging, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the third constant voltage value, the fourth constant voltage value and the charging and discharging multiplying power to acquire second charging and discharging data;
step S54, setting a fifth constant voltage value during charging and a sixth constant voltage value during discharging, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the fifth constant voltage value, the sixth constant voltage value and the fourth current;
step S55, judging whether the charge and discharge current is smaller than the current threshold in the charge and discharge process, if yes, entering step S56; if not, go to step S54;
and step S56, setting a seventh constant voltage value during charging and an eighth constant voltage value during discharging, and controlling the charging pile to charge and discharge the battery of the electric automobile based on the seventh constant voltage value, the eighth constant voltage value and the charging and discharging multiplying power to acquire second charging and discharging data.
Further, the values of the first constant voltage value, the second constant voltage value, the third constant voltage value, the fourth constant voltage value, the fifth constant voltage value, the sixth constant voltage value, the seventh constant voltage value and the eighth constant voltage value are respectively:
first constant voltage value = Vbmsx-charging pile voltage resolution 10;
second constant voltage value = Vbmsx + charging pile voltage resolution 10;
third constant voltage value = Vbmsx + BMS voltage resolution;
fourth constant voltage value= Vbmsx-BMS voltage resolution;
fifth constant voltage value = Vbmsy-charging pile voltage resolution 10;
sixth constant voltage value=vbmsy+charging pile voltage resolution 10;
seventh constant voltage value = Vbmsy + BMS voltage resolution;
eighth constant voltage value= Vbmsy-BMS voltage resolution.
Further, in the step S50, the second charge and discharge data includes:
pile terminal voltage vpile_bmsx_0 when Vbmsx occurs for the first time in the charging or discharging process of the vehicle terminal voltage; pile terminal voltage vpile_bmsx_1 when Vbmsx appears at last time in the vehicle terminal voltage charging or discharging process;
pile terminal voltage vpile_bmsy_0 when Vbmsy occurs for the first time in the charging or discharging process of the vehicle terminal voltage; pile terminal voltage vpile_bmsy_1 when Vbmsy occurs last time in the charge or discharge process of the car terminal voltage.
Further, in the step S60, the calculation formula of the actual DRC is:
Vpile_bmsx*＝(Vpile_bmsx_0+Vpile_bmsx_1)/2；
Vpile_bmsy*＝(Vpile_bmsy_0+Vpile_bmsy_1)/2；
Rdcr＝(Vpile_bmsx*-Vpile_bmsy*)/(Ipilex-Ipiley)；
wherein Rdcr represents Rdcr;
the calculation formula of the actual DCR deviation range is as follows:
voltage deviation=abs (vpile_bmsx_1-vpile_bmsx_0)/2 at the third current;
voltage deviation=abs (vpile_bmsy_1-vpile_bmsy_0)/2 at the fourth current;
DCR deviation= (voltage deviation under third current+voltage deviation under fourth current)/(Ipilex-Ipiley);
actual DCR deviation range= [ (rdcr+dcr deviation), (Rdcr-DCR deviation) ];
the calculation formula of the actual charging gun contact impedance is as follows:
Rcontact＝(Vpile_bmsy*-Vpiley)/Ipiley；
wherein Rcontact represents the actual charging gun contact impedance;
the calculation formula of the contact impedance deviation range of the actual charging gun is as follows:
contact resistance deviation = voltage deviation at fourth current/Ipiley;
actual charging gun contact impedance deviation range= [ (rcontact+contact impedance deviation), (Rcontact-contact impedance deviation) ].
The invention has the advantages that:
1. because the voltage resolution of the BMS is 0.1V, the acquired data are 400.5V when 400.45V and 400.54V, and the precision is not high, the electric automobile is subjected to constant voltage charging and discharging by setting a third current, a fourth current, a current threshold and a charging and discharging multiplying power for the charging pile, namely, in a constant voltage mode, the electric automobile is firstly charged and discharged by the third current, the charging and discharging speed is regulated by the charging and discharging multiplying power when the current is smaller than the current threshold, and pile end voltages Vpin_bmsx_0 and Vpin_bmsx_1 when the vehicle end voltage occurs in the charging and discharging process are respectively recorded; and then charging and discharging by using a fourth current, regulating the charging and discharging speed through the charging and discharging multiplying power when the current is smaller than the current threshold value, respectively recording pile end voltages Vpin_bmsy_0 and Vpin_bmsy_1 when the vehicle end voltage occurs in the charging and discharging process, calculating related deviation through Vpin_bmsy_x_0, vpin_bmsy_1, vpin_bmsy_0 and Vpin_bmsy_1, carrying out precision calibration on the Vpin_msx and the Vpin_msy, and finally carrying out calculation on an actual DRC, an actual DCR deviation range, an actual charging gun contact impedance and an actual charging gun contact impedance deviation range by using the Vpin_bmsy_0, the Vpin_bmsy_1, so that the charging gun to the electric vehicle can obtain more accurate impedance data even though adopting a 2-line system, compared with the traditional method, the method greatly improves the accuracy of direct current impedance test, and is beneficial to the detection of the subsequent electric vehicle contact impedance deviation range due to the fact that the DCR deviation range is calculated.
2. The charging pile is controlled to charge and discharge the battery of the electric automobile based on the set first current and second current respectively, first charging and discharging data are obtained, the output impedance of the charging gun, the initial contact impedance of the charging gun and the initial DCR are calculated by using the first charging and discharging data, then fault self-checking is carried out on the charging pile and the electric automobile, unnecessary direct current impedance testing is avoided on the charging pile or the electric automobile with faults, further efficiency of the direct current impedance testing is improved, and safety of the direct current impedance testing is also improved.
Drawings
The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for testing direct current impedance of a charging pile according to the present invention.
Detailed Description
Referring to fig. 1, a preferred embodiment of a method for testing dc impedance of a charging pile according to the present invention includes the following steps:
step S10, setting a first current and a second current, and respectively controlling a charging pile to charge and discharge a battery of the electric automobile based on the first current and the second current to acquire first charge and discharge data; during discharging, the first current is larger than the second current;
step S20, calculating charging gun output impedance, initial charging gun contact impedance and initial DCR based on the first charging and discharging data;
step S30, performing fault self-checking based on the charging gun output impedance, the initial charging gun contact impedance and the initial DCR;
step S40, setting a third current, a fourth current, a current threshold and a charge-discharge multiplying power;
step S50, based on a constant voltage mode, respectively utilizing the third current, the fourth current, the current threshold value and the charge-discharge multiplying power to control the charge pile to charge and discharge the battery of the electric automobile, and obtaining second charge-discharge data;
and step S60, calculating an actual DRC, an actual DCR deviation range, an actual charging gun contact impedance and an actual charging gun contact impedance deviation range based on the second charge-discharge data, completing the test of the direct current impedance, and displaying and storing the actual DRC, the actual DCR deviation range, the actual charging gun contact impedance and the actual charging gun contact impedance deviation range.
The step S10 specifically includes:
setting a first current and a second current, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the first current to obtain first charging and discharging data comprising a first pile end voltage Vilex, a first pile end current Ipilex and a first pile end voltage Vbmsx;
and based on the second current control charging pile, charging and discharging the battery of the electric automobile, and acquiring first charging and discharging data comprising a second pile end voltage Vpeiley, a second pile end current Ipile and a second car end voltage Vbmsy.
The first pile end voltage Vilex, the first pile end current Iilex, the second pile end voltage Viley and the second pile end current Iiley are read from the charging pile; the first terminal voltage Vbmsx and the second terminal voltage Vbmsy are read from the BMS of the electric vehicle through the CAN bus.
In the step S20, the calculation formulas of the charging gun output impedance, the initial charging gun contact impedance and the initial DCR are as follows:
Rout*＝(Vpilex-Vpiley)/(Ipilex-Ipiley)；
Rcontact*＝(Vbmsy-Vpiley)/Ipiley；
Rdcr*＝(Vbmsx-Vbmsy)/(Ipilex-Ipiley)；
where Rout denotes the gun output impedance, rcontact denotes the initial gun contact impedance, rdcr denotes the initial DCR.
The step S30 specifically includes:
step S31, a first output impedance threshold, a second output impedance threshold, a contact impedance threshold and a DCR threshold are set; the first output impedance threshold is less than the second output impedance threshold;
step S32, judging whether the output impedance of the charging gun is larger than a first output impedance threshold value, if so, entering step S33; if not, go to step S34;
step S33, judging whether the output impedance of the charging gun is larger than a second output impedance threshold value, if so, ending the flow; if not, prompting that the output impedance is abnormal, and proceeding to step S34;
step S34, judging whether the contact impedance of the initial charging gun is larger than a contact impedance threshold, if so, prompting replacement of the charging pile, and ending the flow; if not, go to step S35;
step S35, judging whether the initial DCR is larger than a DCR threshold value, if so, prompting that the electric automobile is abnormal, and ending the flow; if not, the process proceeds to step S40.
The charging pile is controlled to charge and discharge the battery of the electric automobile respectively based on the set first current and second current, first charging and discharging data are obtained, the first charging and discharging data calculate charging gun output impedance, initial charging gun contact impedance and initial DCR, so that fault self-checking is carried out on the charging pile and the electric automobile, unnecessary direct current impedance testing is avoided on the charging pile or the electric automobile with faults, further efficiency of the direct current impedance testing is improved, and safety of the direct current impedance testing is also improved.
In the step S40, the value of the third current is a×first current, the value of the fourth current is a×second current, and the value of the charge-discharge multiplying power is bC; wherein the value ranges of a and b are (0, 1); the value of a is preferably 0.5, and the value of b is preferably 0.01.
The step S50 specifically includes:
step S51, setting a first constant voltage value during charging and a second constant voltage value during discharging, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the first constant voltage value, the second constant voltage value and a third current;
step S52, judging whether the charge and discharge current is smaller than the current threshold in the charge and discharge process, if yes, entering step S53; if not, go to step S52;
step S53, setting a third constant voltage value during charging and a fourth constant voltage value during discharging, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the third constant voltage value, the fourth constant voltage value and the charging and discharging multiplying power to acquire second charging and discharging data;
step S54, setting a fifth constant voltage value during charging and a sixth constant voltage value during discharging, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the fifth constant voltage value, the sixth constant voltage value and the fourth current;
step S55, judging whether the charge and discharge current is smaller than the current threshold in the charge and discharge process, if yes, entering step S56; if not, go to step S54;
and step S56, setting a seventh constant voltage value during charging and an eighth constant voltage value during discharging, and controlling the charging pile to charge and discharge the battery of the electric automobile based on the seventh constant voltage value, the eighth constant voltage value and the charging and discharging multiplying power to acquire second charging and discharging data.
Because the accuracy calibration is performed on Vbmsx and Vbmsy, if the constant voltage mode is not adopted, the accuracy calibration is likely to be performed by overcharging or overdischarging, and therefore the accuracy calibration cannot be performed on Vbmsx and Vbmsy. If the constant voltage mode is not adopted, when the third current is used for charging, the charging voltage can rise to be higher than Vbmsx, and Vdie_bmsx_0 and Vdie_bmsx_1 cannot be obtained; when the third current is used for discharging, the charging voltage drops below Vbmsx, and Vdie_bmsx_0 and Vdie_bmsx_1 cannot be obtained; when charging is performed by using the fourth current, the charging voltage may rise above Vbmsy, and vpile_bmsy_0 and vpile_bmsy_1 cannot be obtained; when the fourth current is used for discharging, the charging voltage drops below Vbmsy, and vpile_bmsy_0 and vpile_bmsy_1 cannot be obtained; and after the charge-discharge current is smaller than the current threshold, regulating the constant voltage value and the charge-discharge multiplying power of the charge pile, and then charging and discharging the electric automobile.
The values of the first constant voltage value, the second constant voltage value, the third constant voltage value, the fourth constant voltage value, the fifth constant voltage value, the sixth constant voltage value, the seventh constant voltage value and the eighth constant voltage value are respectively as follows:
first constant voltage value = Vbmsx-charging pile voltage resolution 10; (for charging)
Second constant voltage value = Vbmsx + charging pile voltage resolution 10; (for discharge)
Third constant voltage value = Vbmsx + BMS voltage resolution; (for charging)
Fourth constant voltage value= Vbmsx-BMS voltage resolution; (for discharge)
Fifth constant voltage value = Vbmsy-charging pile voltage resolution 10; (for charging)
Sixth constant voltage value=vbmsy+charging pile voltage resolution 10; (for discharge)
Seventh constant voltage value = Vbmsy + BMS voltage resolution; (for charging)
Eighth constant voltage value= Vbmsy-BMS voltage resolution. (for discharge)
And the voltage resolution of the charging pile and the voltage resolution of the BMS refer to the minimum scale corresponding to the voltage gear.
In the step S50, the second charge/discharge data includes:
pile terminal voltage vpile_bmsx_0 when Vbmsx occurs for the first time in the charging or discharging process of the vehicle terminal voltage; pile terminal voltage vpile_bmsx_1 when Vbmsx appears at last time in the vehicle terminal voltage charging or discharging process;
pile terminal voltage vpile_bmsy_0 when Vbmsy occurs for the first time in the charging or discharging process of the vehicle terminal voltage; pile terminal voltage vpile_bmsy_1 when Vbmsy occurs last time in the charge or discharge process of the car terminal voltage.
In the step S60, the calculation formula of the actual DRC is:
Vpile_bmsx*＝(Vpile_bmsx_0+Vpile_bmsx_1)/2；
Vpile_bmsy*＝(Vpile_bmsy_0+Vpile_bmsy_1)/2；
Rdcr＝(Vpile_bmsx*-Vpile_bmsy*)/(Ipilex-Ipiley)；
wherein Rdcr represents Rdcr;
the calculation formula of the actual DCR deviation range is as follows:
voltage deviation=abs (vpile_bmsx_1-vpile_bmsx_0)/2 at the third current;
voltage deviation=abs (vpile_bmsy_1-vpile_bmsy_0)/2 at the fourth current;
DCR deviation= (voltage deviation under third current+voltage deviation under fourth current)/(Ipilex-Ipiley);
actual DCR deviation range= [ (rdcr+dcr deviation), (Rdcr-DCR deviation) ];
the calculation formula of the actual charging gun contact impedance is as follows:
Rcontact＝(Vpile_bmsy*-Vpiley)/Ipiley；
wherein Rcontact represents the actual charging gun contact impedance;
the calculation formula of the contact impedance deviation range of the actual charging gun is as follows:
contact resistance deviation = voltage deviation at fourth current/Ipiley;
actual charging gun contact impedance deviation range= [ (rcontact+contact impedance deviation), (Rcontact-contact impedance deviation) ].
In summary, the invention has the advantages that:
1. because the voltage resolution of the BMS is 0.1V, the acquired data are 400.5V when 400.45V and 400.54V, and the precision is not high, the electric automobile is subjected to constant voltage charging and discharging by setting a third current, a fourth current, a current threshold and a charging and discharging multiplying power for the charging pile, namely, in a constant voltage mode, the electric automobile is firstly charged and discharged by the third current, the charging and discharging speed is regulated by the charging and discharging multiplying power when the current is smaller than the current threshold, and pile end voltages Vpin_bmsx_0 and Vpin_bmsx_1 when the vehicle end voltage occurs in the charging and discharging process are respectively recorded; and then charging and discharging by using a fourth current, regulating the charging and discharging speed through the charging and discharging multiplying power when the current is smaller than the current threshold value, respectively recording pile end voltages Vpin_bmsy_0 and Vpin_bmsy_1 when the vehicle end voltage occurs in the charging and discharging process, calculating related deviation through Vpin_bmsy_x_0, vpin_bmsy_1, vpin_bmsy_0 and Vpin_bmsy_1, carrying out precision calibration on the Vpin_msx and the Vpin_msy, and finally carrying out calculation on an actual DRC, an actual DCR deviation range, an actual charging gun contact impedance and an actual charging gun contact impedance deviation range by using the Vpin_bmsy_0, the Vpin_bmsy_1, so that the charging gun to the electric vehicle can obtain more accurate impedance data even though adopting a 2-line system, compared with the traditional method, the method greatly improves the accuracy of direct current impedance test, and is beneficial to the detection of the subsequent electric vehicle contact impedance deviation range due to the fact that the DCR deviation range is calculated.
2. The charging pile is controlled to charge and discharge the battery of the electric automobile based on the set first current and second current respectively, first charging and discharging data are obtained, the output impedance of the charging gun, the initial contact impedance of the charging gun and the initial DCR are calculated by using the first charging and discharging data, then fault self-checking is carried out on the charging pile and the electric automobile, unnecessary direct current impedance testing is avoided on the charging pile or the electric automobile with faults, further efficiency of the direct current impedance testing is improved, and safety of the direct current impedance testing is also improved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.
Claims (6)
1. A direct current impedance testing method of a charging pile is characterized by comprising the following steps of: the method comprises the following steps:
step S10, setting a first current and a second current, and respectively controlling a charging pile to charge and discharge a battery of the electric automobile based on the first current and the second current to acquire first charge and discharge data;
step S20, calculating charging gun output impedance, initial charging gun contact impedance and initial DCR based on the first charging and discharging data;
step S30, performing fault self-checking based on the charging gun output impedance, the initial charging gun contact impedance and the initial DCR;
step S40, setting a third current, a fourth current, a current threshold and a charge-discharge multiplying power;
step S50, based on a constant voltage mode, respectively utilizing the third current, the fourth current, the current threshold value and the charge-discharge multiplying power to control the charge pile to charge and discharge the battery of the electric automobile, and obtaining second charge-discharge data;
step S60, calculating an actual DCR, an actual DCR deviation range, an actual charging gun contact impedance and an actual charging gun contact impedance deviation range based on the second charge-discharge data, and completing the test of the direct current impedance;
the step S10 specifically includes:
setting a first current and a second current, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the first current to obtain first charging and discharging data comprising a first pile end voltage Vilex, a first pile end current Ipilex and a first pile end voltage Vbmsx;
charging and discharging the battery of the electric automobile based on the second current control charging pile, and obtaining first charging and discharging data comprising a second pile end voltage Vpeiley, a second pile end current Ipeiley and a second vehicle end voltage Vbmsy;
the step S50 specifically includes:
step S51, setting a first constant voltage value during charging and a second constant voltage value during discharging, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the first constant voltage value, the second constant voltage value and a third current;
step S52, judging whether the charge and discharge current is smaller than the current threshold in the charge and discharge process, if yes, entering step S53; if not, go to step S52;
step S53, setting a third constant voltage value during charging and a fourth constant voltage value during discharging, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the third constant voltage value, the fourth constant voltage value and the charging and discharging multiplying power to acquire second charging and discharging data;
step S54, setting a fifth constant voltage value during charging and a sixth constant voltage value during discharging, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the fifth constant voltage value, the sixth constant voltage value and the fourth current;
step S55, judging whether the charge and discharge current is smaller than the current threshold in the charge and discharge process, if yes, entering step S56; if not, go to step S54;
step S56, setting a seventh constant voltage value during charging and an eighth constant voltage value during discharging, and controlling a charging pile to charge and discharge a battery of the electric automobile based on the seventh constant voltage value, the eighth constant voltage value and the charging and discharging multiplying power to acquire second charging and discharging data;
in the step S50, the second charge/discharge data includes:
pile terminal voltage vpile_bmsx_0 when Vbmsx occurs for the first time in the charging or discharging process of the vehicle terminal voltage; pile terminal voltage vpile_bmsx_1 when Vbmsx appears at last time in the vehicle terminal voltage charging or discharging process;
pile terminal voltage vpile_bmsy_0 when Vbmsy occurs for the first time in the charging or discharging process of the vehicle terminal voltage; pile end voltage vpile_bmsy_1 when Vbmsy appears at last time in the vehicle end voltage charging or discharging process;
in the step S60, the calculation formula of the actual DCR is:
Vpile_bmsx*＝(Vpile_bmsx_0+Vpile_bmsx_1)/2；
Vpile_bmsy*＝(Vpile_bmsy_0+Vpile_bmsy_1)/2；
Rdcr＝(Vpile_bmsx*-Vpile_bmsy*)/(Ipilex-Ipiley)；
wherein Rdcr represents the actual DCR;
the calculation formula of the actual DCR deviation range is as follows:
voltage deviation=abs (vpile_bmsx_1-vpile_bmsx_0)/2 at the third current;
voltage deviation=abs (vpile_bmsy_1-vpile_bmsy_0)/2 at the fourth current;
DCR deviation= (voltage deviation under third current+voltage deviation under fourth current)
difference)/(Ipilex-Ipiley);
actual DCR deviation range= [ (rdcr+dcr deviation), (Rdcr-DCR deviation) ];
the calculation formula of the actual charging gun contact impedance is as follows:
Rcontact＝(Vpile_bmsy*-Vpiley)/Ipiley；
wherein Rcontact represents the actual charging gun contact impedance;
the calculation formula of the contact impedance deviation range of the actual charging gun is as follows:
contact resistance deviation = voltage deviation at fourth current/Ipiley;
actual charging gun contact impedance deviation range= [ (rcontact+contact impedance deviation), (Rcontact-contact impedance deviation) ].
2. The method for testing direct current impedance of charging pile according to claim 1, wherein the method comprises the steps of: the first pile end voltage Vilex, the first pile end current Iilex, the second pile end voltage Viley and the second pile end current Iiley are read from the charging pile; the first terminal voltage Vbmsx and the second terminal voltage Vbmsy are read from the BMS of the electric vehicle through the CAN bus.
3. The method for testing direct current impedance of charging pile according to claim 1, wherein the method comprises the steps of: in the step S20, the calculation formulas of the charging gun output impedance, the initial charging gun contact impedance and the initial DCR are as follows:
Rout*＝(Vpilex-Vpiley)/(Ipilex-Ipiley)；
Rcontact*＝(Vbmsy-Vpiley)/Ipiley；
Rdcr*＝(Vbmsx-Vbmsy)/(Ipilex-Ipiley)；
where Rout denotes the gun output impedance, rcontact denotes the initial gun contact impedance, rdcr denotes the initial DCR.
4. The method for testing direct current impedance of charging pile according to claim 1, wherein the method comprises the steps of: the step S30 specifically includes:
step S31, a first output impedance threshold, a second output impedance threshold, a contact impedance threshold and a DCR threshold are set; the first output impedance threshold is less than the second output impedance threshold;
step S32, judging whether the output impedance of the charging gun is larger than a first output impedance threshold value, if so, entering step S33; if not, go to step S34;
step S33, judging whether the output impedance of the charging gun is larger than a second output impedance threshold value, if so, ending the flow; if not, prompting that the output impedance is abnormal, and proceeding to step S34;
step S34, judging whether the contact impedance of the initial charging gun is larger than a contact impedance threshold, if so, prompting replacement of the charging pile, and ending the flow; if not, go to step S35;
step S35, judging whether the initial DCR is larger than a DCR threshold value, if so, prompting that the electric automobile is abnormal, and ending the flow; if not, the process proceeds to step S40.
5. The method for testing direct current impedance of charging pile according to claim 1, wherein the method comprises the steps of: in the step S40, the value of the third current is a×first current, the value of the fourth current is a×second current, and the value of the charge-discharge multiplying power is bC; wherein the value ranges of a and b are (0, 1).
6. The method for testing direct current impedance of charging pile according to claim 1, wherein the method comprises the steps of: the values of the first constant voltage value, the second constant voltage value, the third constant voltage value, the fourth constant voltage value, the fifth constant voltage value, the sixth constant voltage value, the seventh constant voltage value and the eighth constant voltage value are respectively as follows:
first constant voltage value = Vbmsx-charging pile voltage resolution 10;
second constant voltage value = Vbmsx + charging pile voltage resolution 10;
third constant voltage value = Vbmsx + BMS voltage resolution;
fourth constant voltage value= Vbmsx-BMS voltage resolution;
fifth constant voltage value = Vbmsy-charging pile voltage resolution 10;
sixth constant voltage value=vbmsy+charging pile voltage resolution 10;
seventh constant voltage value = Vbmsy + BMS voltage resolution;
eighth constant voltage value= Vbmsy-BMS voltage resolution.
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