CN109795354B - Automatic alignment device and method for vehicle-mounted wireless charging coil - Google Patents

Abstract

The invention discloses an automatic alignment device and method of a vehicle-mounted wireless charging coil. The ground module comprises: the device comprises a transmitting coil, an RFID reader, a ranging unit, a driving mechanism and an MCU; the vehicle end module comprises: receiving coil, RFID label. The RFID reader reads the optimal charging position data of the RFID tag, the distance measuring unit detects the distance data of the transmitting coil and the receiving coil, the MCU reads and processes the data, and the driving mechanism is controlled to move the position of the transmitting coil until the two coils reach the optimal charging position, and charging is started. The invention can effectively simplify the structure of the vehicle-mounted wireless charging alignment system, reduce the adjustment time of wireless charging and improve the charging efficiency, and meets the requirement of rapid, accurate and automatic alignment of the wireless charging coil.

Description

An automatic alignment device and method for a vehicle-mounted wireless charging coil

Technical field

The invention relates to the technical field of electric vehicle wireless charging, in particular to an automatic alignment device and method capable of realizing a transmitting coil and a receiving coil in electric vehicle wireless charging.

Background technique

Electric vehicles are driven by the vehicle power supply. When the power supply needs to be charged, the optional charging methods are divided into wired charging and wireless charging. Since wireless charging is electrically isolated, there is no need to plug and unplug the plug based on wireless charging, and it can be laid underground, electric shock and discharge With the advantages of less risk, safer and more convenient use, relevant institutions and enterprises in various countries are vigorously developing and promoting their use.

Among the wireless charging methods at this stage, the electromagnetic induction type is the most mature and widely used. However, in practical applications, the artificial parking position will cause an offset between the receiving coil at the car end and the transmitting coil at the ground end, which will seriously affect the wireless charging efficiency.

In order to eliminate the offset of the transmitting and receiving coils, the existing solution is that the driver adjusts the position of the vehicle body with the help of a visual aid system, or the driving mechanism repeatedly moves the transmitting coil without direction until better charging efficiency is obtained. All of the above solutions have obvious defects, including long adjustment time and low alignment accuracy, which seriously affect the charging experience and charging efficiency.

Contents of the invention

In order to overcome the defects of existing solutions, the object of the present invention is to provide an automatic alignment device and method for vehicle-mounted wireless charging coils, which not only simplifies the hardware structure of the alignment device and the complexity of the implementation process, but also reduces the The adjustment time required for alignment is reduced and the alignment accuracy is improved.

First purpose of the present invention can be achieved by taking the following technical solutions:

An automatic alignment device for a vehicle-mounted wireless charging coil, used for automatic alignment of a transmitting coil and a receiving coil in electric vehicle wireless charging, the automatic alignment device includes a ground terminal module installed on the ground side and a ground terminal module installed on the vehicle side The vehicle-end module on the side, wherein the ground-end module includes a transmitting coil, an RFID reader, a distance measuring unit, a drive mechanism, and an MCU, and the vehicle-end module includes a receiving coil and an RFID tag;

The transmitting coil is installed at the ground end for transmitting power; the RFID reader is installed at a position adjacent to the transmitting coil for identifying and reading the data of the RFID tag; the distance measuring unit is installed at the center of the transmitting coil The position is used to measure the distance between the transmitting coil and the receiving coil; the driving mechanism is installed at the bottom of the transmitting coil for adjusting and moving the position of the transmitting coil; the MCU is connected with the RFID reader, the distance measuring unit and the driving mechanism respectively connection, used to process the data of the RFID reader and the distance measuring unit, and control the movement of the driving mechanism; the receiving coil is installed on the vehicle end for receiving power; the RFID tag is installed near the receiving coil for Store optimal charging location data.

Further, the RFID tag has been written with the best charging location data of the electric vehicle it belongs to.

Further, the RFID reader identifies and reads the RFID tag attached to the wireless charging of the electric vehicle and its stored data, and sends it to the MCU.

Further, the MCU will trigger the distance measuring unit to work after receiving the data from the RFID reader.

Further, the distance between the transmitting coil and the receiving coil measured by the distance measuring unit is a distance in three-dimensional directions including X, Y, and Z.

Further, after receiving the optimal charging position data of the RFID reader and the distance data of the ranging unit, the MCU calculates the three-dimensional position distance between the transmitting coil and the receiving coil, and controls the driving mechanism to move the position of the transmitting coil.

Further, the RFID tag is used as an identification code of the electric vehicle.

The second purpose of the present invention can be achieved by taking the following technical solutions:

An automatic alignment method for a vehicle-mounted wireless charging coil, the automatic alignment method comprising the following steps:

After the electric vehicle is parked according to the parking mark boundary, the RFID reader recognizes the RFID tag on the vehicle end and reads the best charging position data, and sends it to the MCU;

After the MCU receives the optimal charging position data, it triggers the distance measuring unit to work, and the distance measuring unit starts to measure the three-dimensional position distance between the transmitting coil and the receiving coil, and sends it to the MCU;

After the MCU receives the optimal charging position data of the RFID reader and the distance data of the ranging unit, it calculates the required moving distance of the transmitting coil;

The MCU controls the driving mechanism to adjust and move the position of the transmitting coil until the transmitting coil and the receiving coil reach the optimal charging position, and the alignment process ends.

Compared with the prior art, the present invention has the following advantages and effects:

1) On the basis of the transmitting coil and the receiving coil, the present invention only adds RFID tags, RFID readers, distance measuring units, MCUs, and driving mechanisms, and has a simple structure and is convenient for installation and maintenance.

2) The present invention adopts the RFID technology in the Internet of Things, uses the best alignment position data stored in the RFID tag as the basis for coil alignment, simplifies and standardizes the information processing of the alignment device, and improves alignment reliability.

3) The alignment action in the present invention is generally divided into 4 steps: RFID tag data reading, ranging unit distance measurement, MCU data collection and processing, and driving mechanism movement. The working mode is fast and effective, which greatly reduces the cost of wireless charging. Adjust timing and improve alignment accuracy.

Description of drawings

Fig. 1 is a schematic structural view of an automatic alignment device in the present invention;

Fig. 2 is a flow chart of the automatic alignment method in the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Embodiment one

As shown in FIG. 1 , this embodiment discloses an automatic alignment device for a vehicle-mounted wireless charging coil. The automatic alignment device is used for automatic alignment of a transmitting coil and a receiving coil in electric vehicle wireless charging.

The automatic alignment device includes a ground-end module installed on the ground side and a vehicle-end module installed on the vehicle side, wherein the ground-end module includes a transmitting coil, an RFID reader, a distance measuring unit, a driving mechanism, and an MCU; the vehicle-end Module includes receiving coil, RFID tag.

The position structure relationship of each component is described in detail below:

In the ground end module, the transmitting coil is installed on the ground end for transmitting power.

The RFID reader is installed near the transmitting coil to identify and read the data of the RFID tag. In the specific application, the RFID reader identifies and reads the RFID tag attached to the wireless charging of the electric vehicle and its stored data, and sends it to the MCU.

The distance measuring unit is installed at the center of the transmitting coil, and is used to measure the distance between the transmitting coil and the receiving coil, wherein the distance is the distance in the three-dimensional directions including X, Y, and Z.

The driving mechanism is installed at the bottom of the transmitting coil for adjusting and moving the position of the transmitting coil.

The MCU is respectively connected with the RFID reader, the distance measuring unit and the driving mechanism to process the data of the RFID reader and the distance measuring unit. After receiving the data from the RFID reader, the MCU will trigger the distance measuring unit to work and control the drive Agency moves.

In a specific application, after receiving the optimal charging position data of the RFID reader and the distance data of the ranging unit, the MCU calculates the three-dimensional position distance between the transmitting coil and the receiving coil, and controls the driving mechanism to move the position of the transmitting coil.

In the vehicle end module, the receiving coil is installed on the vehicle end to receive power.

RFID tags are installed adjacent to the receiving coils to store the best charging location data.

In addition, the best charging location data of the electric vehicle to which it belongs has been written into the RFID tag. Each electric vehicle is equipped with a corresponding RFID tag, that is, there is a one-to-one correspondence.

Embodiment two

As shown in Figure 2, this embodiment discloses an automatic alignment method for a vehicle-mounted wireless charging coil. The automatic alignment method operates based on the automatic alignment device disclosed in the above embodiment, and specifically includes the following steps:

Step S1, the electric vehicle parks according to the boundary line of the parking sign;

Step S2, the RFID reader recognizes the RFID tag on the vehicle end and reads the best charging position data, and sends it to the MCU immediately;

Step S3, after the MCU receives the data, it immediately triggers the distance measuring unit to work, and the distance measuring unit starts to measure the three-dimensional position distance between the transmitting coil and the receiving coil, and immediately sends it to the MCU;

Step S4, after the MCU receives the optimal charging position data of the RFID reader and the distance data of the ranging unit, it calculates the required moving distance of the transmitting coil;

Step S5, the MCU controls the driving mechanism to move the position of the transmitting coil until the transmitting coil and the receiving coil reach the optimal charging position, and the alignment process ends;

Step S6, start charging.

Among them, the RFID tag is written into the best charging position data before the electric vehicle leaves the factory, and can be used as the identification mark of the electric vehicle. In this automatic alignment method, the RFID reader reads the optimal charging position data of the RFID tag and sends it to the MCU; the MCU triggers the distance measuring unit to measure the distance between the transmitting coil and the receiving coil after receiving the data, and sends the distance information to to the MCU; after the MCU receives the optimal charging position data of the RFID reader and the distance data of the ranging unit, it calculates the required moving distance of the transmitting coil, and controls the driving mechanism to move the position of the transmitting coil until the transmitting coil and the receiving Charging begins when the coil reaches the optimum charging position.

In summary, the structure of the on-board wireless charging alignment device is effectively simplified, the adjustment time of wireless charging is reduced and the charging efficiency is improved, which meets the needs of fast and accurate automatic alignment of wireless charging coils. It is in line with the development trend and market demand in the field of vehicle wireless charging technology, and has important engineering application value and good industrialization prospects.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (5)

1. An automatic alignment device for a vehicle-mounted wireless charging coil, used for automatic alignment of a transmitting coil and a receiving coil in electric vehicle wireless charging, characterized in that the automatic alignment device includes a ground terminal installed on one side of the ground module and a car-end module installed on one side of the vehicle, wherein the ground-end module includes a transmitting coil, an RFID reader, a distance measuring unit, a drive mechanism, and an MCU, and the car-end module includes a receiving coil and an RFID tag; The transmitting coil is installed at the ground end for transmitting power; the RFID reader is installed at a position adjacent to the transmitting coil for identifying and reading the data of the RFID tag; the distance measuring unit is installed at the center of the transmitting coil The position is used to measure the distance between the transmitting coil and the receiving coil; the driving mechanism is installed at the bottom of the transmitting coil for adjusting and moving the position of the transmitting coil; the MCU is connected with the RFID reader, the distance measuring unit and the driving mechanism respectively connection, used to process the data of the RFID reader and the distance measuring unit, and control the movement of the driving mechanism; the receiving coil is installed on the vehicle end for receiving power; the RFID tag is installed near the receiving coil for Store the best charging location data; Wherein, the RFID tag has been written into the best charging position data of the electric vehicle to which it belongs; The RFID reader identifies and reads the RFID tag attached to the wireless charging of the electric vehicle and its stored data, and sends it to the MCU; After the MCU receives the data from the RFID reader, it will trigger the distance measuring unit to work. 2. The automatic alignment device of a vehicle-mounted wireless charging coil according to claim 1, wherein the distance between the transmitting coil and the receiving coil measured by the distance measuring unit is a three-dimensional direction including X, Y, and Z. distance. 3. The automatic alignment device of a vehicle-mounted wireless charging coil according to claim 1, wherein the MCU calculates after receiving the optimal charging position data of the RFID reader and the distance data of the ranging unit. Calculate the three-dimensional position distance between the transmitting coil and the receiving coil, and control the driving mechanism to move the position of the transmitting coil. 4. The automatic alignment device of a vehicle-mounted wireless charging coil according to claim 1, wherein the RFID tag is used as an identification code of the electric vehicle. 5. An automatic alignment method for a vehicle-mounted wireless charging coil based on the automatic alignment device described in any one of claims 1 to 4, wherein the automatic alignment method comprises the following steps: After the electric vehicle is parked according to the parking mark boundary, the RFID reader recognizes the RFID tag on the vehicle end and reads the best charging position data, and sends it to the MCU; After the MCU receives the optimal charging position data, it triggers the distance measuring unit to work, and the distance measuring unit starts to measure the three-dimensional position distance between the transmitting coil and the receiving coil, and sends it to the MCU; After the MCU receives the optimal charging position data of the RFID reader and the distance data of the ranging unit, it calculates the required moving distance of the transmitting coil; The MCU controls the driving mechanism to adjust and move the position of the transmitting coil until the transmitting coil and the receiving coil reach the optimal charging position, and the alignment process ends.