CN111342570A - Vehicle-mounted wireless charger foreign matter identification method - Google Patents
Vehicle-mounted wireless charger foreign matter identification method Download PDFInfo
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- CN111342570A CN111342570A CN202010169314.XA CN202010169314A CN111342570A CN 111342570 A CN111342570 A CN 111342570A CN 202010169314 A CN202010169314 A CN 202010169314A CN 111342570 A CN111342570 A CN 111342570A
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- vehicle
- wireless charger
- temperature
- foreign matter
- mounted wireless
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
Abstract
The invention discloses a foreign matter identification method for a vehicle-mounted wireless charger, which is characterized by comprising the following steps: the method comprises the following steps of S1, detecting the temperature of each area of a transmitting terminal at fixed time through a temperature sensor to obtain the temperature detection value of each area, associating the temperature detection value with the charging duration time, and obtaining the temperature change value of each area in the latest charging time period; s2, comparing the temperature change value of each area with the calibration threshold value of the corresponding charging time period, and judging that foreign matters exist in the corresponding area when the temperature change value is out of the range of the calibration threshold value; and when the temperature change value is within the range of the calibration threshold value, judging that no foreign matter exists in the corresponding area. The foreign matter identification method has low false alarm rate and can accurately identify small foreign matters; the universality is strong, and a special circuit is not required to be added, so that the cost is saved; the foreign matter identification method is a foreign matter detection solution which is directly provided aiming at the temperature problem, and is beneficial to improving the use safety of products.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a foreign matter identification method for a vehicle-mounted wireless charger.
Background
From the safety of users, the QI standard provides a mandatory requirement for the foreign object detection function of the wireless charger, and the foreign object detection method of the wireless charger in the market basically adopts power loss and Q value detection. However, these two methods have certain limitations in practical operation and have some disadvantages that cannot be overcome by themselves, which are mainly reflected in: the two methods cannot effectively distinguish two states that the receiving end is over against the transmitting end when foreign matters exist and the receiving end is placed at the edge of the transmitting end when no foreign matters exist, so that the action of the wireless charger for misreporting the foreign matters can be caused when the receiving end deviates due to vehicle jolt in the driving process, and the user experience is influenced. Meanwhile, these methods have great randomness in detecting small-sized foreign substances.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the vehicle-mounted wireless charger foreign matter identification method is accurate in identification.
In order to solve the technical problems, the invention adopts the technical scheme that: a foreign matter identification method for a vehicle-mounted wireless charger comprises the following steps,
s1, detecting the temperature of each area of the transmitting end at regular time through a temperature sensor to obtain the temperature detection value of each area, associating the temperature detection value with the charging duration time to obtain the temperature change value of each area in the latest charging time period;
s2, comparing the temperature change value of each area with a calibration threshold value corresponding to the charging time period, and judging that foreign matters exist in the corresponding area when the temperature change value is out of the range of the calibration threshold value; and when the temperature change value is within the range of the calibration threshold value, judging that no foreign matter exists in the corresponding area.
Further, when each region is determined to have no foreign matter, return is made to step S1; when it is determined that foreign matter exists in at least one of the areas, step S21 is performed, and the in-vehicle wireless charger stops charging.
Further, step S21 includes a step in which the vehicle-mounted wireless charger issues a malfunction alarm.
Further, the step S21 of "issuing a malfunction alarm by the in-vehicle wireless charger" specifically includes issuing a specific malfunction alarm corresponding to the area determined to have the foreign object.
Further, step S01 is further included before step S1, whether the temperature sensors in each area of the transmitting end can normally operate is detected, and when each temperature sensor can normally operate, the vehicle-mounted wireless charger is ready to enter a charging state; when at least one temperature sensor cannot work normally, the vehicle-mounted wireless charger is not started and/or the vehicle-mounted wireless charger reports faults.
Further, in step S01, after the step "when each of the temperature sensors is able to work normally, the vehicle-mounted wireless charger is ready to enter the charging state", the method further includes step S02 of detecting whether the receiving end meets the QI standard, and if the receiving end meets the QI standard, the vehicle-mounted wireless charger directly enters the charging state and executes step S1; if the receiving end does not meet the QI standard, the vehicle-mounted wireless charger is not started and/or the vehicle-mounted wireless charger reports a fault.
Further, the temperature sensor comprises a first temperature sensor for detecting the temperature of the charging coil, and the calibration threshold comprises a first calibration threshold corresponding to the temperature change value of the charging coil.
Further, the temperature sensor further comprises a second temperature sensor for detecting the temperature of the panel corresponding to each region, and the calibration threshold value further comprises a second calibration threshold value corresponding to the temperature change value of the panel.
Further, in step S1, the temperature sensor detects the temperature of each region of the emitting end every 5 to 15 seconds.
Further, in step S1, the temperature sensor detects the temperature of each region of the emitting end every 10 seconds.
The invention has the beneficial effects that: the method comprises the steps of dividing a transmitting end of the vehicle-mounted wireless charger into a plurality of areas, respectively obtaining temperature changes of the areas in a charging time period, comparing the temperature changes with a calibration threshold value, and when foreign matters exist between the transmitting end and a receiving end of the vehicle-mounted wireless charger, the transmitting end area corresponding to the foreign matters has the condition that the temperature changes exceed the calibration threshold value, so that foreign matter identification is achieved.
1. After the transmitting terminal divides into a plurality of regions, the receiving terminal is just placed at transmitting terminal border department these two kinds of states when the receiving terminal was just to the transmitting terminal and no foreign matter when on-vehicle wireless charger can effectual differentiation has the foreign matter, can not take place the action of misreport foreign matter for on-vehicle wireless charger foreign matter discernment is more accurate, very big improvement user experience.
2. The vehicle-mounted wireless charger foreign matter identification method can also effectively solve the problem of small-size foreign matters, and solves the problem of incapability of solving the small foreign matters caused by a universal power loss and Q value detection method.
3. The most dangerous place of wireless charging is the problem of overhigh temperature rise when foreign matters exist, and the foreign matter identification method of the vehicle-mounted wireless charger directly provides a foreign matter detection solution aiming at the temperature problem, so that the wireless charger can be well controlled to heat up abnormally due to the foreign matters, the damage to users is avoided, and the use safety of products is improved.
4. The problem that a power loss strategy of foreign matter detection cannot effectively aim at all receiving ends is solved, meanwhile, a special circuit is not required to be additionally added like Q value detection, and cost is saved.
Drawings
Fig. 1 is a flowchart of a method for recognizing a foreign object in a vehicle-mounted wireless charger according to a first embodiment of the present invention.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a method for recognizing a foreign object in a vehicle-mounted wireless charger includes the following steps,
s1, detecting the temperature of each area of the transmitting end at regular time through a temperature sensor to obtain the temperature detection value of each area, associating the temperature detection value with the charging duration time to obtain the temperature change value of each area in the latest charging time period;
s2, comparing the temperature change value of each area with a calibration threshold value corresponding to the charging time period, and judging that foreign matters exist in the corresponding area when the temperature change value is out of the range of the calibration threshold value; and when the temperature change value is within the range of the calibration threshold value, judging that no foreign matter exists in the corresponding area.
The working principle of the invention is briefly described as follows: the method comprises the steps of dividing a transmitting end of the vehicle-mounted wireless charger into a plurality of areas, respectively obtaining temperature changes of the areas in a charging time period, comparing the temperature changes with a calibration threshold value, and when foreign matters exist between the transmitting end and a receiving end of the vehicle-mounted wireless charger, the transmitting end area corresponding to the foreign matters has the condition that the temperature changes exceed the calibration threshold value, so that foreign matter identification is achieved.
From the above description, the beneficial effects of the present invention are: 1. after the transmitting terminal divides into a plurality of regions, the receiving terminal is just placed at transmitting terminal border department these two kinds of states when the receiving terminal was just to the transmitting terminal and no foreign matter when on-vehicle wireless charger can effectual differentiation has the foreign matter, can not take place the action of misreport foreign matter for on-vehicle wireless charger foreign matter discernment is more accurate, very big improvement user experience. 2. The vehicle-mounted wireless charger foreign matter identification method can also effectively solve the problem of small-size foreign matters, and solves the problem of incapability of solving the small foreign matters caused by a universal power loss and Q value detection method. 3. The most dangerous place of wireless charging is the problem of overhigh temperature rise when foreign matters exist, and the foreign matter identification method of the vehicle-mounted wireless charger directly provides a foreign matter detection solution aiming at the temperature problem, so that the wireless charger can be well controlled to heat up abnormally due to the foreign matters, the damage to users is avoided, and the use safety of products is improved. 4. The problem that a power loss strategy of foreign matter detection cannot effectively aim at all receiving ends is solved, meanwhile, a special circuit is not required to be additionally added like Q value detection, and cost is saved.
Further, when each region is determined to have no foreign matter, return is made to step S1; when it is determined that foreign matter exists in at least one of the areas, step S21 is performed, and the in-vehicle wireless charger stops charging.
According to the description, when the foreign matters exist in the area of the transmitting end, the vehicle-mounted wireless charger stops working immediately, so that accidents are avoided, and the personal safety and property safety of users are effectively guaranteed.
Further, step S21 includes a step in which the vehicle-mounted wireless charger issues a malfunction alarm.
According to the description, the vehicle-mounted wireless charger sends out the fault alarm to remind a user of timely clearing foreign matters between the transmitting end and the receiving end, the situation that the route arrangement of the user is influenced due to the fact that the vehicle is not electrified is avoided, and the user experience is further enhanced.
Further, the step S21 of "issuing a malfunction alarm by the in-vehicle wireless charger" specifically includes issuing a specific malfunction alarm corresponding to the area determined to have the foreign object.
As can be seen from the above description, each region of the transmitting terminal has a specific fault alarm, which is beneficial to enabling a user to know the position of the foreign object more quickly and clear the foreign object, and enhances the user experience. The specific malfunction alarms may be different sound alarms, different light alarms, etc.
Further, step S01 is further included before step S1, whether the temperature sensors in each area of the transmitting end can normally operate is detected, and when each temperature sensor can normally operate, the vehicle-mounted wireless charger is ready to enter a charging state; when at least one temperature sensor cannot work normally, the vehicle-mounted wireless charger is not started and/or the vehicle-mounted wireless charger reports faults.
As can be seen from the above description, the existence of step S01 can ensure that each region of the transmitting end can be accurately detected, which is beneficial to further improving the accuracy of the foreign object identification.
Further, in step S01, after the step "when each of the temperature sensors is able to work normally, the vehicle-mounted wireless charger is ready to enter the charging state", the method further includes step S02 of detecting whether the receiving end meets the QI standard, and if the receiving end meets the QI standard, the vehicle-mounted wireless charger directly enters the charging state and executes step S1; if the receiving end does not meet the QI standard, the vehicle-mounted wireless charger is not started and/or the vehicle-mounted wireless charger reports a fault.
According to the description, when the receiving end does not meet the QI standard, the vehicle-mounted wireless charger does not work, so that the personal safety and the property safety of a user can be further ensured.
Further, the temperature sensor comprises a first temperature sensor for detecting the temperature of the charging coil, and the calibration threshold comprises a first calibration threshold corresponding to the temperature change value of the charging coil.
According to the above description, when foreign matters exist in the emission end region corresponding to a certain charging coil, the charging coil is heated more seriously and exceeds a calibration threshold, and the first temperature sensor directly detects the temperature of the charging coil, so that the accuracy of foreign matter identification is further improved.
Further, the temperature sensor further comprises a second temperature sensor for detecting the temperature of the panel corresponding to each region, and the calibration threshold value further comprises a second calibration threshold value corresponding to the temperature change value of the panel.
As can be seen from the above description, the second temperature sensor detects the temperature of the panel, which can assist in identifying the foreign object, and further improves the accuracy of the foreign object identification.
Further, in step S1, the temperature sensor detects the temperature of each region of the emitting end every 5 to 15 seconds.
Further, in step S1, the temperature sensor detects the temperature of each region of the emitting end every 10 seconds.
Example one
Referring to fig. 1, a first embodiment of the present invention is: a foreign matter identification method for a vehicle-mounted wireless charger comprises the following steps,
s1, detecting the temperature of each area of the transmitting end at regular time through a temperature sensor to obtain the temperature detection value of each area, associating the temperature detection value with the charging duration time to obtain the temperature change value of each area in the latest charging time period;
s2, comparing the temperature change value of each area with a calibration threshold value corresponding to the charging time period, and judging that foreign matters exist in the corresponding area when the temperature change value is out of the range of the calibration threshold value; and when the temperature change value is within the range of the calibration threshold value, judging that no foreign matter exists in the corresponding area. When each region is determined to have no foreign matter, return is made to step S1; when it is determined that foreign matter exists in at least one of the areas, step S21 is performed, and the in-vehicle wireless charger stops charging.
In order to allow the user to quickly know that the in-vehicle wireless charger stops charging due to a foreign object, step S21 further includes a step in which the in-vehicle wireless charger issues a malfunction alarm. In order to allow the user to accurately know the location where the foreign object is present, the step S21 of "issuing a malfunction alarm by the in-vehicle wireless charger" specifically includes issuing a specific malfunction alarm corresponding to the area where the foreign object is determined to be present, based on the area.
Preferably, step S01 is further included before step S1, where whether the temperature sensors in each area of the transmitting end can normally operate is detected, and when each temperature sensor can normally operate, the vehicle-mounted wireless charger is ready to enter a charging state; when at least one temperature sensor cannot work normally, the vehicle-mounted wireless charger is not started and/or the vehicle-mounted wireless charger reports faults.
Further preferably, in step S01, after the step "when each of the temperature sensors is capable of working normally, the vehicle-mounted wireless charger is ready to enter the charging state", the method further includes step S02 of detecting whether the receiving end meets the QI standard, and if the receiving end meets the QI standard, the vehicle-mounted wireless charger directly enters the charging state and executes step S1; if the receiving end does not meet the QI standard, the vehicle-mounted wireless charger is not started and/or the vehicle-mounted wireless charger reports a fault.
Specifically, temperature sensor is including the first temperature sensor who is used for detecting the charging coil temperature, mark the threshold value including with the first threshold value of maring that the temperature variation value of charging coil corresponds, optional, first temperature sensor with charging coil direct contact, so, can let the information that first temperature sensor gathered more accurate to further improve the precision of foreign matter discernment.
Optionally, the temperature sensor further includes a second temperature sensor for detecting a temperature of the panel corresponding to each region, and the calibration threshold further includes a second calibration threshold corresponding to a temperature change value of the panel. The panel temperature of each area is collected, the panel temperature change value of each area in the charging time period is obtained, and the panel temperature change value is compared with a second calibration threshold value, so that the panel temperature change value can be used for assisting in identifying foreign matters.
In step S1, the temperature sensor detects the temperature of each region of the emitting end every 5 to 15 seconds, and optionally, in step S1, the temperature sensor detects the temperature of each region of the emitting end every 10 seconds.
For the clearer understanding of the technical scheme, the applicant illustrates that the transmitting end of the vehicle-mounted wireless charger includes a left area, a middle area and a right area which are named as a first area, a second area and a third area respectively, a first charging coil and a first temperature sensor which are in contact with each other are arranged in the first area, a second charging coil and a second first temperature sensor which are in contact with each other are arranged in the second area, a third charging coil and a third first temperature sensor which are in contact with each other are arranged in the third area, the first temperature sensor is used for detecting the temperature of the first charging coil, the second first temperature sensor is used for detecting the temperature of the second charging coil, and the third first temperature sensor is used for detecting the temperature of the third charging coil; the first calibration thresholds corresponding to the first, second and third areas may be the same or different.
The time intervals of the first temperature sensor, the second temperature sensor and the third temperature sensor for detecting the first charging coil, the second charging coil and the third charging coil are all 10 seconds, and after the vehicle-mounted charger is started to work, when foreign matters enter a first area in the 32 th second charging coil, the first temperature is the first temperatureThe temperature of the first charging coil detected by the sensor at the 30 th second is T1The temperature of the first charging coil detected by the first temperature sensor at the 40 th second is T2Temperature variation value △ T ═ T2-T1. Since the last charging period was 30-40 seconds, the first calibration threshold should be the theoretical temperature rise T30-40Comparing △ T with T30-40Will find T30-40When the temperature change value of the first area is smaller than △ T, namely the temperature change value of the first area is outside the range of the calibrated threshold value, the first area can be judged to have foreign matters, and the wireless charger can resume working after the user clears the foreign matters in the first area to remove the fault.
Furthermore, a first panel and a first temperature sensor which are in contact with each other are arranged in the first area, a second panel and a second temperature sensor which are in contact with each other are arranged in the second area, a third panel and a third temperature sensor which are in contact with each other are arranged in the third area, the first temperature sensor is used for detecting the temperature of the first panel, the second temperature sensor is used for detecting the temperature of the second panel, and the third temperature sensor is used for detecting the temperature of the third panel; the second calibration thresholds corresponding to the first, second and third areas may be the same or different.
The time intervals of the first temperature sensor, the second temperature sensor and the third temperature sensor for detecting the first panel, the second panel and the third panel are all 10 seconds, and when foreign matters enter the first area in the 32 th second after the vehicle-mounted charger is started to work, the temperature of the first panel detected by the first temperature sensor in the 30 th second is T1', the temperature of the first panel detected by the first temperature sensor at 40 th second is T2', temperature variation value △ T' ═ T2-T1. Since the last charging period was 30-40 seconds, the second calibration threshold should be the theoretical temperature rise T30-40', compare △ T' with T30-40', T will be found30-40'less than △ T', namely the temperature variation value of the first area is outside the range of the calibrated threshold value, therefore, the first area can be judged to have foreign mattersThe reason for the panel of the domain is that the accuracy of foreign matter identification is further improved, when only the first temperature sensor for detecting the temperature of the charging coil is provided, when the voltage of the charging coil is unstable or other factors affect, there is a very small probability that the temperature change value △ T exceeds the first calibration threshold value corresponding to the charging time period, after the second temperature sensor for detecting the temperature of the panel is provided, when △ T exceeds the first calibration threshold value and △ T' exceeds the second calibration threshold value at the same time, it is determined that foreign matter exists in the region, and thus, the accuracy of foreign matter identification can be further improved.
In conclusion, the vehicle-mounted wireless charger foreign matter identification method provided by the invention has extremely low false alarm rate, and can accurately identify foreign matters, particularly small foreign matters; the universality is strong, and a special circuit is not required to be added, so that the cost is effectively saved; the foreign matter identification method of the vehicle-mounted wireless charger is a foreign matter detection solution which is directly provided for the temperature problem, can well control the wireless charger to heat up due to abnormal foreign matter, avoids damaging a user, and is beneficial to improving the use safety of a product.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A vehicle-mounted wireless charger foreign matter identification method is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s1, detecting the temperature of each area of the transmitting end at regular time through a temperature sensor to obtain the temperature detection value of each area, associating the temperature detection value with the charging duration time to obtain the temperature change value of each area in the latest charging time period;
s2, comparing the temperature change value of each area with a calibration threshold value corresponding to the charging time period, and judging that foreign matters exist in the corresponding area when the temperature change value is out of the range of the calibration threshold value; and when the temperature change value is within the range of the calibration threshold value, judging that no foreign matter exists in the corresponding area.
2. The vehicle-mounted wireless charger foreign matter identification method according to claim 1, characterized in that: when each region is determined to have no foreign matter, return is made to step S1; when it is determined that foreign matter exists in at least one of the areas, step S21 is performed, and the in-vehicle wireless charger stops charging.
3. The vehicle-mounted wireless charger foreign matter identification method according to claim 2, characterized in that: step S21 further includes a step in which the vehicle-mounted wireless charger issues a malfunction alarm.
4. The vehicle-mounted wireless charger foreign matter identification method according to claim 3, characterized in that: the step S21 of "the in-vehicle wireless charger issuing a malfunction alarm" specifically includes issuing a specific malfunction alarm corresponding to the area determined to have the foreign object.
5. The vehicle-mounted wireless charger foreign matter identification method according to claim 1, characterized in that: step S01 of detecting whether the temperature sensors in all the areas of the transmitting end can work normally or not before step S1, and when all the temperature sensors can work normally, the vehicle-mounted wireless charger is ready to enter a charging state; when at least one temperature sensor cannot work normally, the vehicle-mounted wireless charger is not started and/or the vehicle-mounted wireless charger reports faults.
6. The vehicle-mounted wireless charger foreign matter identification method according to claim 5, characterized in that: in step S01, after the "when each temperature sensor is able to work normally, the vehicle-mounted wireless charger is ready to enter the charging state" further includes step S02, detecting whether the receiving end meets the QI standard, if the receiving end meets the QI standard, the vehicle-mounted wireless charger directly enters the charging state and executes step S1; if the receiving end does not meet the QI standard, the vehicle-mounted wireless charger is not started and/or the vehicle-mounted wireless charger reports a fault.
7. The vehicle-mounted wireless charger foreign matter identification method according to claim 1, characterized in that: the temperature sensor comprises a first temperature sensor used for detecting the temperature of the charging coil, and the calibration threshold comprises a first calibration threshold corresponding to the temperature change value of the charging coil.
8. The vehicle-mounted wireless charger foreign matter identification method according to claim 7, characterized in that: the temperature sensor also comprises a second temperature sensor used for detecting the temperature of the panel corresponding to each area, and the calibration threshold value also comprises a second calibration threshold value corresponding to the temperature change value of the panel.
9. The vehicle-mounted wireless charger foreign matter identification method according to claim 1, characterized in that: in step S1, the temperature sensor detects the temperature of each region of the emitting end every 5 to 15 seconds.
10. The vehicle-mounted wireless charger foreign matter identification method according to claim 9, characterized in that: in step S1, the temperature sensor detects the temperature of each area of the emitting end every 10 seconds.
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| EP2602908A1 (en) * | 2011-11-30 | 2013-06-12 | Sony Corporation | Detecting device, power receiving device, contactless power transmission system, and detecting method |
| CN103269092A (en) * | 2013-03-28 | 2013-08-28 | 北京小米科技有限责任公司 | Method for charging by utilizing wireless charger and wireless charger |
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