Device for communicating electric or hybrid vehicle with electric charging column and communication method

Abstract

The invention relates to a device for communicating an electric or hybrid vehicle with an electrical charging column via at least one data line, said device having at least one transmitter and at least one receiver, said transmitter being designed to transmit over n frequency channels with a defined transmission power, said receiver being designed to transmit over n frequency channels with a defined transmission power. The invention relates to a device for transmitting power to a charging column in order to receive the received power of the charging column for n frequency channels, said device having a control unit which is designed such that the communication with the charging column is continued or interrupted as a function of the received received power, said transmitter being designed such that the transmission power can be increased for n frequency channels, said control unit being designed such that the transmission power of the charging column can be increased for n frequency channels. The transmission power of the transmitter is increased for n frequency channels when the received power is below a first threshold value, and the transmitter re-transmits on all n frequency channels and the receiver re-receives the received power of the charging column, and an associated communication method.

Description

Technical Field

[0001] The invention relates to a device for enabling an electric or hybrid vehicle to communicate with an electrical charging post and a method of communication. Background Art

[0002] Before the actual charging process between charging pole and vehicle, a comprehensive data exchange takes place, which is standardized, for example, in ISO 15118 and DIN 70121. For this purpose, ISO 15118 provides HomePlug Green PHY as the physical layer. This is a power line communication method (PLC) derived from HomePlug AV.

[0003] Under the scope of ISO / IEC-15118 advanced communications, the initial connection establishment between the vehicle and the charging post is a crucial event. Once the driver connects his vehicle to the charging post, the goal is first: to join a secure AV logical network (AVLN). Each AVLN is represented by a network ID (NID). In addition, each participant of the AVLN needs a network membership key that matches the NID for encrypted communication.

[0004] At the start of communication establishment, the vehicle sends an Ethernet broadcast message to all possible network participants. All charging posts that receive this signal respond to this with an Ethernet unicast acknowledgment. Since multiple charging posts can be connected to the physical power supply line, the protocol is responsible for identifying the relevant charging post to which the vehicle is connected. Due to undesired coupling, other charging posts that are not physically connected to the vehicle can also be mentioned. Therefore, in the case of HomePlug Green PHY, the so-called signal level attenuation characteristic mechanism (SLAC) is responsible for the correct and safe process of connection establishment. SLAC works according to the request-response method, in which the request always originates from the electric vehicle. At the same time, the vehicle and the charging post agree on a RunID, which is a univocal identifier that must contain all subsequent messages of the same SLAC session.

[0005] The connection establishment through SLAC passes through various stages in sequence, such as "detection stage", "attenuation characterization stage", "verification stage", "matching stage" and "amplitude map exchange stage". Therefore, based on the different strengths of signal attenuation, the vehicle can identify the charging post to which the vehicle is physically connected from a large number of responding charging posts with the help of the SLAC mechanism. At the end of this process, the electric vehicle and the charging post form a common AVLN, through which higher protocol layers exchange their information in encrypted form.

[0006] The attenuation characterization phase is usually carried out in such a way that the vehicle-side transmitter transmits on 1150 carriers (frequency channels) between 1.8 and 30 MHz, wherein the transmission intensity is fixed and adjusted at the band end of the vehicle in a calibration step. These carriers are sequentially acquired from the signal level on the charging column side and sent back to the vehicle as measured values. It can also be provided that the charging column already combines the measured values ​​(for example two carriers), so that instead of 1150 measured values, for example only 575 measured values ​​have to be transmitted back.

[0007] Here, the received power at the charging post must exceed a certain level, otherwise the communication will terminate.

[0008] For this purpose, a mean value is typically determined for the individual PSD values ​​(Power Spectral Density) and compared with a threshold value.

[0009] In particular, if the charging column is not installed correctly, it can result in the attenuation being so great that the charging column cannot be used. Summary of the invention

[0010] The invention is based on the technical problem of creating an improved device for communicating an electric or hybrid vehicle with an electrical charging column and providing a corresponding communication method for use.

[0011] The solution to the technical problem is provided by a device having the following characteristics:

[0012] A device (1) for enabling an electric or hybrid vehicle to communicate with an electric charging post (2) via at least one data line (9), wherein the device comprises at least one transmitter (3) and at least one receiver (4), wherein the transmitter (3) is designed to transmit at a defined transmission power on n frequency channels, wherein the receiver (4) is designed to receive the reception power of the charging post (2) for the n frequency channels, wherein the device comprises a control unit (5), wherein the control unit (5) is designed to continue or interrupt the communication with the charging post (2) depending on the received reception power.

[0013] It is characterized in that

[0014] The transmitter (3) is designed so that the transmission power can be increased for the n frequency channels, the control unit (5) is designed so that when the reception power is below a first threshold value, the transmission power of the transmitter (3) is increased for the n frequency channels, and the transmitter (3) transmits again on all n frequency channels, and the receiver (4) receives the reception power of the charging column (2) again,

[0015] And a method with the following characteristics:

[0016] A method for communication between an electric or hybrid vehicle and an electric charging post (2) via at least one data line (9), wherein the electric or hybrid vehicle has a device (1) having at least one transmitter (3) and at least one receiver (4), wherein the transmitter (3) transmits sequentially at a defined transmission power on n frequency channels, wherein the receiver (4) receives the reception power of the charging post (2) for the n frequency channels, and the charging post (2) transmits it to the receiver (4), wherein a control unit (5) of the device (1) continues or interrupts communication with the charging post (2) depending on the received reception power,

[0017] It is characterized in that

[0018] When the received reception power is lower than a first threshold, the control unit (5) increases the transmission power of the transmitter (3) for the n frequency channels, wherein the transmitter (3) then transmits to the charging post (2) again on the n frequency channels, and the receiver (4) receives the reception power of the charging post (2) again,

[0019] Conclude.

[0020] The device for communicating an electric or hybrid vehicle with an electric charging post via at least one data line has at least one transmitter and at least one receiver. The transmitter is designed so that transmission is performed at a defined transmission power on n frequency channels, wherein n is preferably greater than 1000 and preferably 1150. At least one receiver is designed so that the reception power of the charging post is received for the n frequency channels, and the charging post transmits it back to the motor vehicle. In addition, the device has a control unit, which is designed so that the communication with the charging post is continued or interrupted depending on the received reception power. In addition, the transmitter is designed so that the transmission power for the n frequency channels can be increased, wherein the control unit is also designed so that when the reception power is below a first threshold value, the transmission power of the transmitter is increased for the n frequency channels, and the transmitter transmits again on all n frequency channels, and the receiver receives the reception power of the charging post again. It should be noted here that it can be provided that the transmission power is not increased for all n frequency channels, but only for frequency channels with lower reception power. However, preferably, the transmission power of all n frequency channels is increased. By increasing the transmission power, the probability that the charging process can still be carried out is increased.

[0021] In this case, it can be provided that the charging column itself also increases its transmission intensity when transmitting the received power again, in order to ensure that the control unit reliably receives the transmitted received power despite attenuation. Preferably, the increase in the transmission power is limited to a maximum value. It can be provided that during the retransmission, the maximum permissible transmission power is always transmitted. Alternatively, it can also be provided that the charging column adapts the transmission power as a function of the received power at the charging column. At the latest after the charging process has ended, the charging column then sets the standard transmission power again.

[0022] In one embodiment, the device is designed in such a way that the communication is interrupted if, despite the increase in the transmit power, the received receive power continues to be below the first threshold value, ie the transmit power is increased only once.

[0023] In another embodiment, the control unit is designed in such a way that the transmission power is increased by a drop value (Unterschreite) corresponding to the first threshold value. This value preferably has a safety margin, for example, it is greater than the deviation from the first threshold value by a certain absolute value or by a percentage additional value (Aufschlag, sometimes also called an increase value) (for example 5% or 10%). Therefore, it does not transmit at the maximum possible transmission power, but only transmits at a transmission power that is adapted due to the actual attenuation. This is particularly advantageous under EMC considerations, because otherwise the communication of other vehicles could be disrupted.

[0024] In another embodiment, the control unit is designed such that an average value is formed from the received reception powers, wherein the average value is compared with a first threshold value. This simplifies the evaluation compared to a single evaluation via n frequency channels or groups of frequency channels (eg, a pairwise aggregation in a charging column).

[0025] In one embodiment, the control unit is designed so that the communication is interrupted immediately when the received reception power also falls below a second threshold value, wherein the second threshold value is less than the first threshold value. This prevents attempts to receive communication at very high transmission power in the case of extreme attenuation, which could lead to the EMC problems already described.

[0026] In another embodiment, the device is designed in such a way that the transmission power is adjusted individually for each frequency channel or group of frequency channels.

[0027] In an alternative embodiment, the device is designed in such a way that the transmission power is set for all n frequency channels using a single gain value.

[0028] In another embodiment, the device is designed in such a way that the transmission power is adjusted back to the defined transmission power after the charging process is completed.

[0029] A communication method between an electric or hybrid vehicle and an electric charging column is carried out via at least one data line, wherein the electric or hybrid vehicle has a device having at least one transmitter and at least one receiver. The at least one transmitter transmits sequentially at a defined transmission power on n frequency channels. The charging column also has at least one transmitter and at least one receiver. The charging column receives the n messages sent and determines their respective reception powers, which are then sent back again by the charging column, wherein the reception powers of two frequency channels can also be summed up, for example. The receiver of the device then receives the transmitted reception power of the charging column and transmits it to a control unit, wherein the control unit continues or interrupts the communication with the charging column according to the received reception power of the charging column. Here, when the received reception power is below a first threshold value, the control unit increases the transmission power of the transmitter for n frequency channels, wherein the transmitter then transmits again to the charging column on n frequency channels, and the receiver receives the reception power of the charging column again. For further embodiments of the method, reference is made to the above explanation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The invention is explained in more detail below with the aid of a preferred exemplary embodiment.

[0031] The sole FIGURE shows a schematic block diagram of a device for an electric or hybrid vehicle for communicating with an electrical charging post. DETAILED DESCRIPTION

[0032] exist Figure 1 , a device 1 for communicating an electric or hybrid vehicle with an electric charging column 2 is shown. The device 1 has at least one transmitter 2, at least one receiver 4 and a control unit 5. Similarly, the charging column 2 has at least one transmitter 6, at least one receiver 7 and a control unit 8. The device 1 and the charging column 2 are connected to each other in terms of data technology via a data line 9 of a charging cable, wherein the data line 9 is, for example, a pilot line. The further conductors of the charging cable are not shown. The control unit 5 controls the transmitter 3 so that it transmits sequentially at a defined transmission power on n frequency channels. Preferably, n=1150, wherein the frequency channels are between 1.8-30 MHz. The receiver 7 of the charging column 2 receives these n messages and transmits them at the corresponding reception power to the control unit 8, which then transmits the received reception power back to the device 1 via the transmitter 6, wherein the individual frequency channels can also be summed up here. The reception power is then received by the receiver 4 and transmitted to the control unit 5. The control unit 5 then determines the average spectral power density from the reception power and compares it with a first threshold value. If the average spectral power density is above the first threshold value, the communication continues. It can also be provided here that the determination of the average spectral power density takes place completely in the charging column 2 , so that the latter transmits only the average spectral power density to the device 1 .

[0033] If, on the other hand, the determined average spectral power density is below the first threshold value but above the second threshold value, the transmission power is increased for n frequency channels. Preferably, the transmission power is increased only as much as the reception power is below the first threshold value. If the reception power is, for example, 10 dBm / Hz below the first threshold value, the transmission power is increased accordingly by 10 dBm / Hz, wherein preferably a certain safety distance is applied to the increase. Here, the increase can be increased by a value in which the amplifier value AFC gain is increased. Alternatively, the transmission intensity of each frequency channel is increased individually by a determined value. Then the method is then repeated, i.e. the device 1 transmits at an increased transmission power on all n frequency channels and receives the reception power at the charging column 2, which transmits it back. If then the average spectral power density is above the first threshold value, the communication continues. On the other hand, if it is below the first threshold value again, the communication is terminated. Likewise, if the average spectral power density of the received signal is less than the second threshold value (for example, 40 dBm / Hz below the first threshold value), the communication method is immediately interrupted.

[0034] By adapting the transmission power during operation, the availability of the charging column 2 can be increased in the event of communication problems.

[0035] Reference numerals list

[0036] 1 Equipment

[0037] 2 Charging columns

[0038] 3 Transmitter

[0039] 4 Receiver

[0040] 5 Control unit

[0041] 6 Transmitter

[0042] 7 Receiver

[0043] 8 Control unit

[0044] 9 Data Line

Claims

1. A device (1) for enabling an electric or hybrid vehicle to communicate with an electric charging post (2) via at least one data line (9), wherein: The device comprises at least one transmitter (3) and at least one receiver (4), wherein the transmitter (3) is designed to transmit at a defined transmission power on n frequency channels, wherein the receiver (4) is designed to receive the reception power of the charging column (2) for the n frequency channels, wherein the device comprises a control unit (5), wherein the control unit (5) is designed to continue or interrupt communication with the charging column (2) depending on the received reception power. It is characterized in that The transmitter (3) is designed in such a way that the transmission power can be increased for the n frequency channels, wherein the control unit (5) is designed in such a way that when the reception power is below a first threshold value, the transmission power of the transmitter (3) is increased for the n frequency channels, and the transmitter (3) transmits again on all n frequency channels, and the receiver (4) receives the reception power of the charging column (2) again.

2. The device according to claim 1, characterized in that The device (1) is designed in such a way that the communication is interrupted if, despite the increase in the transmit power, the received receive power continues to be below a first threshold value.

3. The device according to claim 1 or 2, characterized in that The control unit (5) is designed in such a way that the transmission power is increased by a value corresponding to the reduced value of the first threshold value.

4. The device according to any one of the preceding claims, characterized in that The control unit (5) is designed in such a way that a mean value is formed from the received reception powers, wherein the mean value is compared with the first threshold value.

5. The device according to any one of the preceding claims, characterized in that The control unit (5) is designed in such a way that the communication is interrupted immediately if the received reception power also falls below a second threshold value, wherein the second threshold value is smaller than the first threshold value.

6. The device according to any one of the preceding claims, characterized in that The device (1) is designed in such a way that the transmission power is adjusted individually for each frequency channel or group of frequency channels.

7. The device according to any one of claims 1 to 5, characterized in that The device (1) is designed in such a way that the transmission power is set for all frequency channels using a single gain value.

8. The device according to any one of the preceding claims, characterized in that The device is designed in such a way that, after the charging process is completed, the transmission power is adjusted again to the defined transmission power.

9. A method for communication between an electric or hybrid vehicle and an electrical charging post (2) via at least one data line (9), wherein: The electric or hybrid vehicle has a device (1), which has at least one transmitter (3) and at least one receiver (4), wherein the transmitter (3) transmits sequentially at a defined transmission power on n frequency channels, wherein the receiver (4) receives the reception power of the charging column (2) for the n frequency channels, and the charging column (2) transmits it to the receiver (4), wherein a control unit (5) of the device (1) continues or interrupts communication with the charging column (2) according to the received reception power, It is characterized in that When the received reception power is lower than a first threshold value, the control unit (5) increases the transmission power of the transmitter (3) for the n frequency channels, wherein the transmitter (3) then transmits again to the charging post (2) on the n frequency channels, and the receiver (4) receives the reception power of the charging post (2) again.

10. The method according to claim 9, characterized in that If, despite the increase in the transmit power, the received receive power continues to lie below the first threshold value, the communication is interrupted.

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