CN114487667B - Electric automobile wireless charging interoperability test system and method - Google Patents
Electric automobile wireless charging interoperability test system and method Download PDFInfo
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Abstract
The invention discloses a system and a method for testing electric automobile wireless charging interoperability, which divide the electric automobile wireless charging interoperability into magnetic interoperability and electric interoperability, wherein the magnetic interoperability evaluation index is a coupling coefficient area in an interoperability evaluation graph, and the electric interoperability evaluation index is an efficiency area in the interoperability evaluation graph. The test object is Re (Z) GA ) And Re (Z) VA ) And when the tested product equipment meets the magnetic interoperability and the electrical interoperability and simultaneously meets the output power requirement, the tested product equipment is considered to meet the interoperability requirement, and optimization suggestions are given to all the tested product equipment according to the test results of the magnetic interoperability and the electrical interoperability. The invention not only avoids the cross test among products and reduces the test workload, but also has more accurate test result.
Description
Technical Field
The invention provides an electric automobile wireless charging interoperability evaluation method based on magnetic interoperability and electrical interoperability, and belongs to the technical field of wireless power transmission.
Background
The wireless charging interoperability of the electric vehicle refers to wireless charging ground end equipment (GA) and vehicle end equipment (VA) of electric vehicles of different manufacturers and different models, and on the premise of ensuring charging safety, wireless power transmission meeting performance and function requirements can be realized under the conditions of specified power level and ground clearance type. On one hand, the existing wireless charging equipment has more technical route branches, and has great differences in structures and parameters such as power level, transmission distance, coil type and structure, working frequency, compensation network topology and the like; on the other hand, the situation that multiple manufacturers, multiple products and multiple technical routes coexist exists. Therefore, interoperability test is required to be carried out among different wireless charging devices, and the problems that great power resource waste and even potential safety hazards are caused due to poor interoperability among different devices are avoided.
The existing electric vehicle wireless charging system interoperability testing method has serious defects, mainly comprising the following steps:
1. the existing testing method is based on cross testing among products, and the testing workload is large. In order to fully test the interoperability among all products, the power and efficiency of all ground-end equipment and vehicle-mounted end equipment in the interoperation process need to be tested in a cross mode. On one hand, the test process puts forward a rigorous requirement on a test mechanism, great workload is brought by traversing all products, and meanwhile, a large part of repeated tests exist, so that the product interoperability is obviously not suitable for judgment; on the other hand, due to the lack of reference equipment, the test result cannot be traced, namely the product optimization design cannot be guided.
2. The existing evaluation method ignores the influence of coil internal resistance on a system, but in the actual situation, the coil size of the electric automobile is large, and the neglect of the internal resistance causes errors in a test result.
3. The existing evaluation method directly evaluates interoperability through transmission power and efficiency, the power efficiency can only describe the overall characteristics of the system, the reason why the interoperability is not satisfied by products cannot be analyzed and explained, and optimization suggestions cannot be given to the products.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a system and a method for testing wireless charging interoperability of an electric automobile based on magnetic interoperability and electrical interoperability.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a testing method for wireless charging interoperability of an electric automobile comprises the following steps:
And 2, dividing the wireless charging interoperability of the electric automobile into magnetic interoperability and electrical interoperability. According to the range of the coil k given in the wireless charging standard of the electric vehicle, the abscissa is Re (Z) GA ) The ordinate is Re (Z) VA ) The two-dimensional plane graph of the magnetic coupling coefficient is used for drawing a boundary curve with the coupling coefficient being k to obtain a coupling coefficient area, and the coupling coefficient area is used as a magnetic interoperability evaluation criterion. On the abscissa, re (Z) GA ) The ordinate is Re (Z) VA ) An efficiency boundary curve of given efficiency is made in the two-dimensional plane graph to obtain an efficiency area, and the efficiency area is used as an electrical interoperability evaluation criterion. Define the abscissa as Re (Z) GA ) The ordinate is Re (Z) VA ) The two-dimensional plane diagram containing the coupling coefficient region and the efficiency region is an interoperability evaluation diagram.
And 4, testing whether the output power of the wireless charging test unit meets the requirement after the wireless charging test unit is powered on, and if the output power does not meet the power requirement, terminating the test and judging that the tested product equipment does not meet the interoperability requirement. If the power requirement is met, measuring the voltage U of the primary coil end of the wireless charging test unit 1 Primary coil current I 1 And the phase difference theta between the voltage at the primary winding end and the current at the primary winding 1 Further, re (Z) was calculated GA ). Then measuring the secondary side coil terminal voltage U of the wireless charging test unit 2 Secondary side coil current I 2 And the phase difference theta between the secondary coil terminal voltage and the secondary coil current 2 Further, re (Z) was calculated VA ) The abscissa of the test point is recorded as Re (Z) in the interoperability evaluation chart GA ) The ordinate is Re (Z) VA )。
And 5, changing the positions of the test points in the X-axis direction, the Y-axis direction and the Z-axis direction, and recording all the test points in the interoperability evaluation chart. If all the test points are in the coupling coefficient area or in the upper right part of the coupling coefficient area, the tested product equipment is indicated to meet the magnetic interoperability. And if the efficiency of the opposite position test point is more than a given first efficiency area, and the efficiency of the offset position test point is more than a given second efficiency area, indicating that the tested product equipment meets the electrical interoperability.
And 6, if the tested product equipment simultaneously meets the electrical interoperability and the magnetic interoperability, the tested product equipment passes the interoperability test. For the tested product equipment which does not satisfy the magnetic interoperability, the overall coupling condition is enhanced or the anti-offset capability of the coupling coefficient in the faster-descending direction is enhanced according to the change condition of the coupling coefficient in the process of shifting in the XYZ direction. And for the tested product equipment which does not meet the electrical interoperability, optimizing the circuit according to an impedance calculation formula. For the tested product equipment meeting the interoperability, calculating an efficiency coefficient of the tested product equipment, wherein the efficiency coefficient is used for expressing the interoperability degree of the tested product equipment and the reference equipment
Preferably: coupling coefficient in step 2:
wherein Z is GA ＝Z r +jωL 1 +R p ，
Wherein k represents a coupling coefficient between the primary coil and the secondary coil, M represents a mutual inductance between the primary coil and the secondary coil, and L 1 Indicating self-inductance of the primary coil, L 2 Indicating the self-inductance of the secondary winding, re (Z) GA ) Representing the real part of the equivalent impedance, R, as seen from the front of the primary coil to the load side p Indicating the internal resistance of the primary winding, re (Z) VA ) Representing the real part of the equivalent impedance, R, as seen from the back of the secondary winding to the load side s Representing the internal resistance of the secondary winding, omega the angular frequency of the system, Z GA Representing the equivalent impedance as seen from the front of the primary winding to the load side, j representing the imaginary unit, Z r Representing the reflected impedance of the secondary circuit to the primary side.
Preferably: determining an efficiency formula in step 2:
wherein, the first and the second end of the pipe are connected with each other,
U r ＝ωMI 1 ，
where eta represents the system efficiency, I 2 Representing secondary winding current, I 1 Representing the primary coil current, U r Indicating the induced voltage of the secondary winding.
Preferably, the following components: re (Z) in step 4 GA ) And Re (Z) VA ) Respectively obtained according to the following formula:
wherein, U 1 Representing the voltage at the primary winding terminal, I 1 Representing the primary coil current, theta 1 Representing the phase difference between the voltage at the primary winding and the current at the primary winding, U 2 Representing secondary winding terminal voltage, I 2 Representing secondary winding current, theta 2 The phase difference between the secondary winding terminal voltage and the secondary winding current is shown.
Preferably: the efficiencies given in step 2 included efficiencies of 80%, 85%, 90% and 95%.
Preferably: the efficiency coefficient calculation formula in step 6 is as follows:
wherein δ represents an efficiency coefficient, a is the number of test points with efficiency greater than 80% and less than 85%, b is the number of test points with efficiency greater than 85% and less than 90%, c is the number of test points with efficiency greater than 90% and less than 95%, and d is the number of test points with efficiency greater than 95%.
Preferably: in step 5 the first efficiency is given as 85% and the second efficiency is given as 80%.
The utility model provides an electric automobile wireless charging interoperability test system, includes ground reference equipment, on-vehicle reference equipment, interoperability evaluation graph module, test module, calculation module, judgement module, output module, wherein:
the ground reference equipment is used for testing vehicle-mounted product equipment, and a coil of the ground reference equipment refers to a transmitting coil in the wireless charging standard of the electric automobile.
The coil of the vehicle-mounted reference equipment refers to a receiving coil in the wireless charging standard of the electric automobile, and the secondary coil of the vehicle-mounted reference equipment and the secondary compensation network are completely resonant.
And if the tested product equipment is ground product equipment, determining the vehicle-mounted reference equipment matched with the tested ground product equipment according to the power grade and the energy transmission distance grade of the tested ground product equipment. And if the tested product equipment is vehicle-mounted product equipment, determining the ground reference equipment matched with the tested vehicle-mounted product equipment according to the power grade and the energy transmission distance grade of the tested vehicle-mounted product equipment. And taking the paired tested ground product device and vehicle-mounted reference device or the paired tested vehicle-mounted product device and ground reference device as a wireless charging test unit.
The interoperability evaluation chart module is used for making an abscissa Re (Z) GA ) The ordinate is Re (Z) VA ) The two-dimensional plane graph is used for drawing a boundary curve with a coupling coefficient of k on the two-dimensional plane graph to obtain a coupling coefficient area, and the coupling coefficient area is used as a magnetic interoperability evaluation criterion. And making an efficiency eta boundary curve on the two-dimensional plane graph to obtain an efficiency area, and taking the efficiency area as an electrical interoperability evaluation criterion. The abscissa is Re (Z) GA ) The ordinate is Re (Z) VA ) A two-dimensional plane graph containing a coupling coefficient region and an efficiency region is referred to as an interoperability evaluation graph.
The test module is used for changing the relative positions of the tested product equipment and the reference equipment in the wireless charging test unit in the test process to obtain the test positions and traversing all the test positions,primary coil terminal voltage U for recording all test positions 1 Primary coil current I 1 Phase difference theta between terminal voltage of primary coil and current of primary coil 1 Secondary winding terminal voltage U 2 Secondary side coil current I 2 A phase difference theta between the secondary coil terminal voltage and the secondary coil current 2 And sent to the calculation module.
The computing module is used for computing the voltage U according to the voltage U at the primary coil end 1 Primary coil current I 1 Phase difference theta between voltage at primary coil end and current at primary coil 1 Calculation of Re (Z) GA ). According to secondary coil terminal voltage U 2 Secondary side coil current I 2 Phase difference theta between secondary coil terminal voltage and secondary coil current 2 Calculation of Re (Z) VA ). Mixing Re (Z) GA ) As test point abscissa, re (Z) VA ) And obtaining the coordinate of the test point as the vertical coordinate of the test point, and then sending the coordinate of the test point to the judgment module.
The judging module is used for drawing all the test points in the interoperability evaluation chart. If all the test points are in the coupling coefficient area or in the upper right part of the coupling coefficient area, the tested product equipment is indicated to meet the magnetic interoperability. And if the opposite position test point is in a given first efficiency area and the offset position test point is in a given second efficiency area, indicating that the tested product equipment meets the electrical interoperability. If the tested product equipment simultaneously meets the electrical interoperability and the magnetic interoperability, the tested product equipment is indicated to pass the interoperability test, otherwise, the tested product cannot pass the interoperability test.
The output module is used for outputting the anti-offset capability of enhancing the overall coupling condition or enhancing the direction in which the coupling coefficient is reduced faster according to the change condition of the coupling coefficient in the process of shifting in the XYZ direction for the tested product equipment which is not satisfied with magnetic interoperability. And for the tested product equipment which does not meet the electrical interoperability, outputting the optimized circuit according to the impedance calculation formula. And outputting the efficiency coefficient of the tested product equipment meeting the interoperability.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the existing test method based on cross test among products, the electric automobile wireless charging interoperability test method based on magnetic interoperability and electrical interoperability provided by the invention introduces reference equipment (ground reference equipment and vehicle-mounted reference equipment), and adopts the mode of testing the vehicle-mounted product equipment by the ground reference equipment and testing the ground product equipment by the vehicle-mounted reference equipment. In the cross testing method based on the products, one vehicle-mounted product device needs to perform interoperability testing with all current ground product devices. After the reference equipment is introduced, one vehicle-mounted product equipment only needs to carry out interoperability test with one ground reference equipment, and the ground product equipment has the same principle. Therefore, the introduction of the reference equipment avoids cross testing among products and reduces the testing workload.
2. Compared with the prior art that the internal resistance of the coil is ignored, the method provided by the invention fully considers the influence of the internal resistance on the system performance in the actual situation, and the result is more accurate.
3. Compared with the traditional test method that the test result only gives a conclusion whether the interoperability is met or not and cannot give an optimization suggestion, the method decomposes the interoperability into magnetic interoperability and electrical interoperability, and has strong visualization degree of the test result and stronger optimization target. For a tested product device which does not meet magnetic interoperability, a magnetic circuit mechanism of the product device can be optimized according to the change condition of a coupling coefficient in the process of shifting in XYZ directions, the overall coupling condition is increased or the anti-shifting capability of the coupling coefficient in the direction where the coupling coefficient is reduced faster is enhanced, and the optimization mode comprises the steps of optimizing the shape of a coil, optimizing the size of the coil, changing the shape of a magnetic core or changing the number of the magnetic cores and the like. For tested product equipment which does not meet electrical interoperability, the circuit parameters can be optimized according to a port impedance calculation formula in a manner of changing the parameters of the compensation circuit device to change Re (Z) VA ) And Re (Z) GA ) And changing the test points of the low-efficiency area into the test points of the high-efficiency area.
Drawings
FIG. 1 is an equivalent circuit diagram of the system under full compensation;
FIG. 2 is an interoperability evaluation chart;
FIG. 3 is a test flow diagram;
FIG. 4 is a test chart;
fig. 5 is a graph of the test results.
Detailed Description
The present invention is further illustrated in the accompanying drawings and described in the following detailed description, it is to be understood that such examples are included solely for the purposes of illustration and are not intended as a definition of the limits of the invention, since various equivalent modifications of the invention will become apparent to those skilled in the art after reading the present specification, and it is intended to cover all such modifications as fall within the scope of the invention as defined in the appended claims.
A wireless charging interoperability test method for an electric automobile comprises the following steps:
And 2, dividing the wireless charging interoperability of the electric automobile into magnetic interoperability and electrical interoperability. According to the range of the coil k given in the wireless charging standard of the electric vehicle, the abscissa is Re (Z) GA ) The ordinate is Re (Z) VA ) A boundary curve with the coupling coefficient k is drawn in the two-dimensional plane graph to obtain a coupling coefficient area, and the coupling coefficient area is used as a magnetic interoperability evaluation criterion. On the abscissa, re (Z) GA ) The ordinate is Re (Z) VA ) Respectively drawing efficiency boundary curves of 80%, 85%, 90% and 95% of efficiency in the two-dimensional plane graph to obtain efficiency areasAnd the efficiency area is used as an electrical interoperability evaluation criterion. Define the abscissa as Re (Z) GA ) The ordinate is Re (Z) VA ) The two-dimensional plane containing the coupling coefficient region and the efficiency region is an interoperability evaluation graph.
Coupling coefficient:
wherein, Z GA ＝Z r +jωL 1 +R p ，
Wherein k represents a coupling coefficient between the primary coil and the secondary coil, M represents a mutual inductance between the primary coil and the secondary coil, and L 1 Indicating self-inductance of the primary coil, L 2 Represents the self-inductance of the secondary winding Re (Z) GA ) Representing the real part of the equivalent impedance, R, as seen from the front of the primary coil to the load side p Indicating the internal resistance of the primary winding, re (Z) VA ) Representing the real part of the equivalent impedance, R, as seen from the back of the secondary winding to the load side s Representing the internal resistance of the secondary winding, omega the angular frequency of the system, Z GA Representing the equivalent impedance as seen from the front of the primary winding to the load side, j representing the imaginary unit, Z r Representing the reflected impedance of the secondary circuit to the primary side. From the expression of the coupling coefficient k, the coil parameter L can be seen 1 、L 2 、R p And R s Are all constants, and when the system works at rated frequency, the value of the coupling coefficient k can pass through Re (Z) VA ) And Re (Z) GA ) And (4) determining. The coupling coefficient k can represent the coupling state of the magnetic circuit mechanism of the system, namely the coupling state can pass through Re (Z) VA ) And Re (Z) GA ) And obtaining the working state of the magnetic circuit mechanism of the system.
Determining an efficiency formula:
wherein the content of the first and second substances,
U r ＝ωMI 1 ，
where eta represents the system efficiency, I 2 Representing secondary winding current, I 1 Representing primary coil current, U r Indicating the induced voltage of the secondary winding. Efficiency boundary curves of 80%, 85%, 90% and 95% efficiency are respectively drawn in the coupling coefficient map according to the above formula, and the abscissa is defined as Re (Z) GA ) The ordinate is Re (Z) VA ) The two-dimensional plane containing the coupling coefficient region and the efficiency region is an interoperability evaluation graph, which is shown in fig. 2. From the expression of the efficiency eta, the coil internal resistance R p And R s Are all constant, and the value of efficiency eta can be obtained by Re (Z) VA ) And Re (Z) GA ) And (4) determining. The efficiency eta can represent the working state of the system circuit, namely can pass Re (Z) VA ) And Re (Z) GA ) And obtaining the working state of the system circuit. Thus, re (Z) was tested VA ) And Re (Z) GA ) The working state of the magnetic circuit and the electric circuit of the system can be obtained, and Re (Z) is selected herein VA ) And Re (Z) GA ) As interoperability evaluation criteria.
And 4, testing whether the output power of the wireless charging test unit meets the requirement after the wireless charging test unit is powered on, and if the output power does not meet the power requirement, terminating the test and judging that the tested product equipment does not meet the interoperability requirement. If the power requirement is met, the voltage U of the primary side coil end of the wireless charging test unit shown in FIG. 4 is used 1 Primary coil current I 1 And the phase difference theta between the voltage at the primary coil end and the current at the primary coil end 1 Further, re (Z) was calculated GA ). Then measuring secondary coil terminal voltage U of wireless charging test unit 2 Secondary side coil current I 2 And the phase difference theta between the secondary coil terminal voltage and the secondary coil current 2 Further, re (Z) was calculated VA ) The abscissa of the test point is recorded as Re (Z) in the interoperability evaluation chart GA ) The ordinate is Re (Z) VA )。
Re(Z GA ) And Re (Z) VA ) Respectively obtained according to the following formula:
wherein, U 1 Representing the voltage at the primary winding, I 1 Representing the primary coil current, theta 1 Representing the phase difference between the voltage at the primary winding and the current at the primary winding, U 2 Representing secondary winding terminal voltage, I 2 Representing secondary winding current, theta 2 The phase difference between the secondary winding terminal voltage and the secondary winding current is shown.
And 5, changing the positions of the test points in the X-axis direction, the Y-axis direction and the Z-axis direction, and recording all the test points in the interoperability evaluation chart. If all the test points are in the coupling coefficient area or in the upper right part of the coupling coefficient area, the tested product equipment meets the magnetic interoperability. And if the efficiency of the opposite position test point is greater than the given first efficiency area and the efficiency of the offset position test point is greater than the given second efficiency area, indicating that the tested product equipment meets the electrical interoperability.
The test results are shown in fig. 5, and analyzing fig. 5 can lead to the following conclusions:
1. if the test point is at the lower left of the k boundary 1, the coupling coefficient is smaller when the tested product device is coupled with the reference device, and the magnetic interoperability is not satisfied. And if the test point is between the k boundary 1 and the k boundary 2, the coupling coefficient is within the specified range when the tested product equipment is coupled with the reference equipment, and the magnetic interoperability is met. If the test point is at the upper right of the k boundary 2, the coupling coefficient is larger when the tested product device is coupled with the reference device, and better magnetic interoperability is realized.
2. If the test point is to the left and below the 80% efficiency boundary curve, it indicates that the product device under test does not meet electrical interoperability. If the test point is between the 80% efficiency boundary curve and the 95% efficiency boundary curve, it indicates that the product device under test satisfies electrical interoperability. If the test point is to the upper right of the 95% efficiency boundary curve, it indicates that the product device under test has better electrical interoperability.
And 6, if the product equipment simultaneously meets the electrical interoperability and the magnetic interoperability, the tested product equipment is indicated to pass the interoperability test. For the tested product equipment which does not satisfy the magnetic interoperability, the overall coupling condition is enhanced or the anti-offset capability of the coupling coefficient in the faster-descending direction is enhanced according to the change condition of the coupling coefficient in the process of shifting in the XYZ direction. And for the tested product equipment which does not meet the electrical interoperability, optimizing the circuit according to an impedance calculation formula. And calculating an efficiency coefficient of the tested product equipment meeting the interoperability, wherein the efficiency coefficient is used for expressing the interoperability degree of the tested product equipment and the reference equipment.
The efficiency coefficient calculation formula is as follows:
wherein δ represents an efficiency coefficient, a is the number of test points with efficiency greater than 80% and less than 85%, b is the number of test points with efficiency greater than 85% and less than 90%, c is the number of test points with efficiency greater than 90% and less than 95%, and d is the number of test points with efficiency greater than 95%.
From the interoperability test results, recommendations may be made according to the following method:
1. for a tested product device which does not meet interoperability, if the magnetic interoperability is not met, the coupling degree of the coil on the magnetic circuit is increased, the overall coupling condition is enhanced by optimizing the coil parameters or the anti-offset capability of the coil in the direction in which the coupling coefficient is reduced faster in the offset process is enhanced. If electrical interoperability is not satisfied, the compensation network should be optimized in terms of circuitry.
2. For the tested product equipment meeting interoperability, the interoperability degree of the tested product equipment and the reference equipment can be obtained by the efficiency coefficient, and the tested product equipment with higher efficiency coefficient is selected in practical application.
The utility model provides an electric automobile wireless charging interoperability test system, includes ground reference equipment, on-vehicle reference equipment, interoperability evaluation graph module, test module, calculation module, judgement module, output module, wherein:
the ground reference equipment is used for testing vehicle-mounted product equipment, and a coil of the ground reference equipment refers to a transmitting coil in the wireless charging standard of the electric automobile.
The coil of the vehicle-mounted reference equipment refers to a receiving coil in the wireless charging standard of the electric automobile, and the secondary coil of the vehicle-mounted reference equipment and the secondary compensation network are completely resonant.
And if the tested product equipment is ground product equipment, determining vehicle-mounted reference equipment matched with the tested ground product equipment according to the power grade and the energy transmission distance grade of the tested ground product equipment. And if the tested product equipment is vehicle-mounted product equipment, determining ground reference equipment matched with the tested vehicle-mounted product equipment according to the power grade and the energy transmission distance grade of the tested vehicle-mounted product equipment. And taking the paired tested ground product device and vehicle-mounted reference device or the paired tested vehicle-mounted product device and ground reference device as a wireless charging test unit.
The interoperability evaluation chart module is used for making an abscissa Re (Z) GA ) The ordinate is Re (Z) VA ) The two-dimensional plane graph is used for drawing a boundary curve with a coupling coefficient of k to obtain a coupling coefficient area, and the coupling coefficient area is used as a magnetic interoperability evaluation criterion. And drawing an efficiency eta boundary curve on the two-dimensional plane graph to obtain an efficiency area, and taking the efficiency area as an electrical interoperability evaluation criterion. The abscissa is Re (Z) GA ) The ordinate is Re (Z) VA ) A two-dimensional plane graph containing a coupling coefficient region and an efficiency region is referred to as an interoperability evaluation graph.
The test module is used for changing the relative positions of the tested product equipment and the reference equipment in the wireless charging test unit in the test process to obtain test positions, traversing all the test positions and recording the voltage U of the primary side coil end of all the test positions 1 Primary coil current I 1 Phase difference theta between voltage at primary coil end and current at primary coil 1 Secondary coil terminal voltage U 2 Secondary side coil current I 2 Phase difference theta between secondary coil terminal voltage and secondary coil current 2 And sent to the calculation module.
The computing module is used for computing the voltage U according to the voltage of the primary coil end 1 Primary coil current I 1 Phase difference theta between voltage at primary coil end and current at primary coil 1 Calculation of Re (Z) GA ). According to secondary coil terminal voltage U 2 Secondary side coil current I 2 Phase difference theta between secondary coil terminal voltage and secondary coil current 2 Calculation of Re (Z) VA ). Mixing Re (Z) GA ) As test point abscissa, re (Z) VA ) Obtaining the coordinate of the test point as the vertical coordinate of the test point, and then sending the coordinate of the test pointAnd sending the information to a judging module.
The judging module is used for drawing all the test points in the interoperability evaluation chart. If all the test points are in the coupling coefficient area or in the upper right part of the coupling coefficient area, the tested product equipment is indicated to meet the magnetic interoperability. And if the opposite position test point is in the given first efficiency region and the offset position test point is in the given second efficiency region, indicating that the tested product equipment meets the electrical interoperability. If the tested product equipment simultaneously meets the electrical interoperability and the magnetic interoperability, the tested product equipment passes the interoperability test, otherwise, the tested product equipment cannot pass the interoperability test.
The output module is used for outputting the anti-deviation capability of enhancing the overall coupling condition or the coupling coefficient in the direction in which the coupling coefficient is reduced faster according to the change condition of the coupling coefficient in the XYZ direction deviation process for the tested product equipment which does not meet the magnetic interoperability. And for the tested product equipment which does not meet the electrical interoperability, outputting the optimized circuit according to the impedance calculation formula. And outputting the efficiency coefficient of the tested product equipment which meets the interoperability.
The invention divides the wireless charging interoperability of the electric automobile into magnetic interoperability and electrical interoperability, the magnetic interoperability evaluation index is a coupling coefficient area in an interoperability evaluation chart, and the electrical interoperability evaluation index is an efficiency area in the interoperability evaluation chart. The test object is Re (Z) GA ) And Re (Z) VA ) When the tested product equipment meets the magnetic interoperability and the electrical interoperability and simultaneously meets the output power requirement, the tested product equipment is considered to meet the interoperability requirement, and optimization suggestions are given to all the tested product equipment according to the test results of the magnetic interoperability and the electrical interoperability. The invention has the advantages that the theoretical derivation process is not approximately equivalent, and the result is accurate. The magnetic circuit and the circuit characteristics of the product equipment can be seen through the test result, the defects of the product equipment can be more accurately found, and an optimization suggestion is given to guide the improvement of the product.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. The electric automobile wireless charging interoperability testing method is characterized by comprising the following steps of:
step 1, determining reference equipment, wherein the reference equipment is divided into ground reference equipment and vehicle-mounted reference equipment, the ground reference equipment is used for testing vehicle-mounted product equipment, and the vehicle-mounted reference equipment is used for testing the ground product equipment; a coil of the ground reference equipment refers to a transmitting coil in the wireless charging standard of the electric automobile; the coil of the vehicle-mounted reference equipment refers to a receiving coil in the wireless charging standard of the electric automobile, and the secondary coil of the vehicle-mounted reference equipment and the secondary compensation network are completely resonated;
step 2, dividing the wireless charging interoperability of the electric automobile into magnetic interoperability and electrical interoperability; according to the range of the coil k given in the wireless charging standard of the electric vehicle, the abscissa is Re (Z) GA ) The ordinate is Re (Z) VA ) A boundary curve with a coupling coefficient of k is drawn in the two-dimensional plane graph to obtain a coupling coefficient area, and the coupling coefficient area is used as a magnetic interoperability evaluation criterion; on the abscissa, re (Z) GA ) The ordinate is Re (Z) VA ) An efficiency boundary curve of given efficiency is made in the two-dimensional plane graph to obtain an efficiency area, and the efficiency area is used as an electrical interoperability evaluation criterion; define the abscissa as Re (Z) GA ) The ordinate is Re (Z) VA ) The two-dimensional plane containing the coupling coefficient area and the efficiency area is an interoperability evaluation graph;
step 3, testing the product: if the tested product equipment is ground product equipment, determining vehicle-mounted reference equipment matched with the tested ground product equipment according to the power grade and the energy transmission distance grade of the tested ground product equipment; if the tested product equipment is vehicle-mounted product equipment, determining ground reference equipment matched with the tested vehicle-mounted product equipment according to the power grade and the energy transmission distance grade of the tested vehicle-mounted product equipment; taking paired tested ground product equipment and vehicle-mounted reference equipment or paired tested vehicle-mounted product equipment and ground reference equipment as a wireless charging test unit; setting an initial working point of the wireless charging test unit, including setting an input voltage and setting the opposite positions of the tested product equipment and the reference equipment;
step 4, testing whether the output power of the wireless charging test unit meets the requirement after being electrified, if not, terminating the test and judging that the tested product equipment does not meet the interoperability requirement; if the power requirement is met, measuring the voltage U of the primary coil end of the wireless charging test unit 1 Primary coil current I 1 And the phase difference between the voltage at the primary winding end and the current at the primary winding
Further, re (Z) was calculated GA ) (ii) a Then measuring the secondary side coil terminal voltage U of the wireless charging test unit 2 Secondary side coil current I 2 And the phase difference between the secondary coil terminal voltage and the secondary coil current
Further, re (Z) was calculated VA ) (ii) a Mixing Re (Z) GA ) As test point abscissa, re (Z) VA ) Obtaining a test point coordinate as a test point vertical coordinate, and recording the test point in an interoperability evaluation diagram;
step 5, changing the positions of the secondary side coils in the X-axis direction, the Y-axis direction and the Z-axis direction to obtain the coordinates of the test points after the positions are changed, and recording all the test points in an interoperability evaluation chart; if all the test points are in the coupling coefficient area or in the upper right part of the coupling coefficient area, the tested product equipment is represented to meet the magnetic interoperability; if the efficiency of the opposite position test point is greater than the given first efficiency area and the efficiency of the offset position test point is greater than the given second efficiency area, the tested product equipment meets the electrical interoperability;
step 6, if the tested product equipment simultaneously meets the electrical interoperability and the magnetic interoperability, the tested product equipment is indicated to pass the interoperability test; for the tested product equipment which does not meet the magnetic interoperability, the integral coupling condition is enhanced or the anti-offset capability of the coupling coefficient in the faster-descending direction is enhanced according to the change condition of the coupling coefficient of the secondary coil in the process of the offset in the XYZ direction; optimizing the circuit for the tested product equipment which does not meet the electrical interoperability according to an impedance calculation formula; and calculating an efficiency coefficient of the tested product equipment meeting the interoperability, wherein the efficiency coefficient is used for expressing the interoperability degree of the tested product equipment and the reference equipment.
2. The electric vehicle wireless charging interoperability testing method according to claim 1, wherein: coupling coefficient in step 2:
wherein the content of the first and second substances,
，
wherein the content of the first and second substances,krepresenting the coupling coefficient between the primary winding and the secondary winding,
representing the mutual inductance between the primary coil and the secondary coil,L 1 the self-inductance of the primary coil is shown,L 2 indicating the self-inductance of the secondary winding, re (Z) GA ) Showing the real part of the equivalent impedance as seen from the front of the primary coil to the load side,R p indicating internal resistance of primary coil, re (Z) VA ) Representing slave unitsThe real part of the equivalent impedance seen from behind the side coils to the load side,R s the internal resistance of the secondary winding is shown,
the angular frequency of the system is represented,
representing the equivalent impedance as seen from the front of the primary winding to the load side,
the number of the units of an imaginary number is expressed,
representing the reflected impedance of the secondary circuit to the primary.
3. The electric vehicle wireless charging interoperability testing method according to claim 2, wherein: determining an efficiency formula in step 2:
wherein, the first and the second end of the pipe are connected with each other,
，
wherein the content of the first and second substances,
the efficiency of the system is shown to be,I 2 the current of the secondary side coil is shown,I 1 which is representative of the primary coil current,
indicating the induced voltage of the secondary winding.
4. The electric vehicle wireless charging interoperability testing method according to claim 3, wherein: re (Z) in step 4 GA ) And Re (Z) VA ) Respectively obtained according to the following formula:
wherein, U 1 Representing the voltage at the primary winding, I 1 Which is representative of the primary coil current,
representing the phase difference between the voltage at the primary winding and the current at the primary winding, U 2 Representing the secondary winding terminal voltage, I 2 The secondary-side coil current is shown,
the phase difference between the secondary winding terminal voltage and the secondary winding current is shown.
5. The wireless charging interoperability testing method for the electric vehicle according to claim 4, wherein: the efficiencies given in step 2 included efficiencies of 80%, 85%, 90% and 95%.
6. The electric vehicle wireless charging interoperability testing method according to claim 5, wherein: the efficiency coefficient calculation formula in step 6 is as follows:
wherein the content of the first and second substances,
and expressing the efficiency coefficient, wherein a is the number of the test points with the efficiency of more than 80% and less than 85%, b is the number of the test points with the efficiency of more than 85% and less than 90%, c is the number of the test points with the efficiency of more than 90% and less than 95%, and d is the number of the test points with the efficiency of more than 95%.
7. The wireless charging interoperability testing method for the electric vehicle according to claim 6, wherein: in step 5, the first efficiency is given as 85% and the second efficiency is given as 80%.
8. The utility model provides an electric automobile wireless interoperability test system that charges which characterized in that: the system comprises ground reference equipment, vehicle-mounted reference equipment, an interoperability evaluation graph module, a test module, a calculation module, a judgment module and an output module, wherein:
the ground reference equipment is used for testing vehicle-mounted product equipment, and a coil of the ground reference equipment refers to a transmitting coil in the wireless charging standard of the electric automobile;
the vehicle-mounted reference equipment is used for testing ground product equipment, a coil of the vehicle-mounted reference equipment refers to a receiving coil in the wireless charging standard of the electric automobile, and a secondary coil of the vehicle-mounted reference equipment and a secondary compensation network are completely resonated;
if the tested product equipment is ground product equipment, determining vehicle-mounted reference equipment matched with the tested ground product equipment according to the power grade and the energy transmission distance grade of the tested ground product equipment; if the tested product equipment is vehicle-mounted product equipment, determining ground reference equipment matched with the tested vehicle-mounted product equipment according to the power grade and the energy transmission distance grade of the tested vehicle-mounted product equipment; taking paired tested ground product equipment and vehicle-mounted reference equipment or paired tested vehicle-mounted product equipment and ground reference equipment as a wireless charging test unit;
the interoperability evaluation chart module is used for making an abscissa Re (Z) GA ) The ordinate is Re (Z) VA ) The two-dimensional plane graph is used for drawing a boundary curve with a coupling coefficient of k to obtain a coupling coefficient area, and the coupling coefficient area is used as a magnetic interoperability evaluation criterion; making efficiency in two-dimensional plan
Obtaining an efficiency area by using a boundary curve, and taking the efficiency area as an electrical interoperability evaluation criterion; the abscissa is Re (Z) GA ) The ordinate is Re (Z) VA ) A two-dimensional plane graph containing a coupling coefficient area and an efficiency area is taken as an interoperability evaluation graph;
the test module is used for changing the relative position of the tested product equipment and the reference equipment in the wireless charging test unit in the test process to obtain the test position, traversing all the test positions and recording the voltage U of the primary side coil end of all the test positions 1 Primary coil current I 1 Phase difference between primary coil terminal voltage and primary coil current
Secondary winding terminal voltage U 2 Secondary side coil current I 2 Phase difference between secondary coil terminal voltage and secondary coil current
And sending to a computing module;
the computing module is used for computing the voltage U according to the voltage U at the primary coil end 1 Primary coil current I 1 Phase difference between terminal voltage of primary coil and current of primary coil
Calculation of Re (Z) GA ) (ii) a According to secondary coil terminal voltage U 2 Secondary side coil current I 2 Minor edgePhase difference between coil end voltage and secondary coil current
Calculation of Re (Z) VA ) (ii) a Mixing Re (Z) GA ) As test point abscissa, re (Z) VA ) Obtaining a test point coordinate as a test point vertical coordinate, and then sending the test point coordinate to a judgment module;
the judgment module is used for drawing all the test points in the interoperability evaluation chart; if all the test points are in the coupling coefficient area or in the upper right part of the coupling coefficient area, the tested product equipment is represented to meet the magnetic interoperability; if the opposite position test point is in a given first efficiency area and the offset position test point is in a given second efficiency area, the tested product equipment is shown to meet the electrical interoperability; if the tested product equipment simultaneously meets the electrical interoperability and the magnetic interoperability, the tested product equipment passes the interoperability test, otherwise, the tested product equipment cannot pass the interoperability test;
the output module is used for outputting the anti-offset capability of enhancing the whole coupling condition or enhancing the direction where the coupling coefficient is reduced faster according to the change condition of the coupling coefficient in the process of shifting in the XYZ direction for the tested product equipment which is not satisfied with magnetic interoperability; for tested product equipment which does not meet the electrical interoperability, outputting a circuit to be optimized according to an impedance calculation formula; and outputting the efficiency coefficient of the tested product equipment meeting the interoperability.
9. The wireless charging interoperability testing system of the electric vehicle of claim 8, wherein: coupling coefficient:
wherein, the first and the second end of the pipe are connected with each other,
，
wherein the content of the first and second substances,krepresenting the coupling coefficient between the primary winding and the secondary winding,
representing the mutual inductance between the primary coil and the secondary coil,L 1 the self-inductance of the primary coil is shown,L 2 represents the self-inductance of the secondary winding Re (Z) GA ) Representing the real part of the equivalent impedance as seen from the front of the primary coil to the load side,R p indicating internal resistance of primary coil, re (Z) VA ) Showing the real part of the equivalent impedance as viewed from the back of the secondary winding toward the load side,R s the internal resistance of the secondary side coil is shown,
the angular frequency of the system is represented,
representing the equivalent impedance as seen from the front of the primary winding to the load side,
the number of the units of the imaginary number is expressed,
representing the reflected impedance of the secondary circuit reflected to the primary side;
determining an efficiency formula:
wherein the content of the first and second substances,
，
wherein, the first and the second end of the pipe are connected with each other,
the efficiency of the system is shown in the figure,I 2 the current of the secondary side coil is shown,I 1 which is representative of the primary coil current,
indicating the induced voltage of the secondary winding.
10. The wireless charging interoperability testing system for electric vehicles of claim 9, wherein: re (Z) GA ) And Re (Z) VA ) Respectively obtained according to the following formula:
wherein, U 1 Representing the voltage at the primary winding, I 1 Which is representative of the primary coil current,
representing the phase difference between the voltage at the primary winding and the current at the primary winding, U 2 Representing secondary winding terminal voltage, I 2 The current of the secondary side coil is shown,
the phase difference between the secondary winding terminal voltage and the secondary winding current is shown.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110888007A (en) * | 2019-11-19 | 2020-03-17 | 国网智能科技股份有限公司 | Electric automobile wireless charging interoperability test evaluation system and method thereof |
| CN110927486A (en) * | 2019-11-19 | 2020-03-27 | 国网智能科技股份有限公司 | Electric automobile wireless charging interoperability test system and method thereof |
| CN110988754A (en) * | 2018-10-10 | 2020-04-10 | 哈尔滨工业大学 | Magnetic characteristic parameter-based electric vehicle wireless charging system magnetic transmission component interoperability testing method |
| CN111030763A (en) * | 2018-10-10 | 2020-04-17 | 哈尔滨工业大学 | Electric automobile wireless charging system magnetic transmission component interoperability testing method based on complex impedance characterization parameters |
| KR102153332B1 (en) * | 2019-09-17 | 2020-09-08 | 재단법인경북테크노파크 | Automated interoperability test system for wireless charging device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2735085B1 (en) * | 2011-07-21 | 2020-12-30 | UT-Battelle, LLC | Regulation control and energy management scheme for wireless power transfer |
| DE102017202025A1 (en) * | 2017-02-09 | 2018-08-09 | Bayerische Motoren Werke Aktiengesellschaft | Method for checking a primary or secondary unit of an inductive charging system |
-
2022
- 2022-01-18 CN CN202210053972.1A patent/CN114487667B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988754A (en) * | 2018-10-10 | 2020-04-10 | 哈尔滨工业大学 | Magnetic characteristic parameter-based electric vehicle wireless charging system magnetic transmission component interoperability testing method |
| CN111030763A (en) * | 2018-10-10 | 2020-04-17 | 哈尔滨工业大学 | Electric automobile wireless charging system magnetic transmission component interoperability testing method based on complex impedance characterization parameters |
| KR102153332B1 (en) * | 2019-09-17 | 2020-09-08 | 재단법인경북테크노파크 | Automated interoperability test system for wireless charging device |
| CN110888007A (en) * | 2019-11-19 | 2020-03-17 | 国网智能科技股份有限公司 | Electric automobile wireless charging interoperability test evaluation system and method thereof |
| CN110927486A (en) * | 2019-11-19 | 2020-03-27 | 国网智能科技股份有限公司 | Electric automobile wireless charging interoperability test system and method thereof |
Non-Patent Citations (4)
| Title |
|---|
| Research on Evaluation Method of Electric Vehicle Wireless Charging Interoperability Based on Two Parameter Representation;lin sha et al.;《processes》;20220812;第10卷;第1-16页 * |
| 基于三参数表征电动汽车无线充电系统互操作性评价方法研究;张献等;《中国电机工程学报》;20220220;第42卷(第4期);第1569-1581页 * |
| 用于电动汽车无线充电线圈互操作性评价的量规设备研究;杨光等;《电工技术学报》;20201231;第35卷;第363-370页 * |
| 电动汽车无线充电系统不同结构线圈间互操作性评价方法研究;张献等;《电工技术学报》;20201010;第35卷(第19期);第4150-4160页 * |
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Effective date of registration: 20240119 Address after: No. 66, Fuju Road, Guangfu Town, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: ANJIE WIRELESS TECHNOLOGY (SUZHOU) Co.,Ltd. Address before: 221116 Research Institute of China University of Mining and Technology, 1 University Road, Xuzhou, Jiangsu Patentee before: CHINA University OF MINING AND TECHNOLOGY |