DE102017217180A1 - Method for assigning a digital data connection between a motor vehicle and a charging unit and charging unit - Google Patents

Abstract

The invention relates to a method for assigning a digital data connection between a first motor vehicle (2) and a charging unit (1) having a plurality of charging terminals (12, 13, 14, 15) to a first of the plurality of charging terminals (12, 13, 14 , 15) to which the first motor vehicle (2) is connected, wherein the charging unit (1) has only a single common communication unit (10) for the plurality of charging terminals (12, 13, 14, 15), and wherein between the charging unit ( 1) and the first motor vehicle (2) to the first charging port (12) associated first state signal, comprising the steps of: - Checking whether the data connection with the first motor vehicle (2) are assigned to the first charging port (12) based on the first state signal can, and if not: - inhibit a change of at least one further state signal for at least one further motor vehicle (3, 4), and - enable a change of the first state signal for the first one Motor vehicle (2), and- assigning the digital data connection to the first charging port (1), at which the state change of the first state signal is detected.

Description

The invention relates to a method for assigning a digital data connection between a first motor vehicle and a charging unit to one of a plurality of charging terminals of a charging unit. A second aspect of the invention relates to a loading unit.

A charging unit for charging a motor vehicle, in particular an electric vehicle or hybrid vehicle, may have one or more charging ports. In particular, a respective motor vehicle can be connected and charged to each of the charging connections. As a result, an improved utilization of the charging unit, in particular expensive components of the charging unit, for example an inverter, are made possible.

According to the standard ISO 15118 provided for charging the motor vehicle, when the motor vehicle is being charged, communication takes place between the motor vehicle and the charging unit by means of powerline communication (PLC). In other words, a data connection is established by means of powerline communication. It is based on the standard in the data connection from a point to point connection. This means that in the case of multiple charging ports each of the charging ports must be assigned a respective communication unit for establishing the powerline communication or the data connection. In other words, a separate communication unit is required for each of the charging ports.

The use of a plurality of communication units, in particular so-called PLC modems, is associated with costs for the communication units on the one hand and with costs for structural and software integration of the communication units on the other. The respective communication units for each of the charging connections can not be dispensed with according to the prior art, in particular, since a clear assignment of the motor vehicle with which the data connection is established to that of the charging connections to which the motor vehicle is connected is not reliably possible. For example, the data connections of two motor vehicles, which are connected simultaneously to the charging unit, can not be unambiguously assigned to any of the charging ports.

It is an object of the present invention to allow an assignment of a digital data connection between a motor vehicle and a charging unit having a plurality of charging ports and only one communication unit for establishing the digital data connection.

This object is achieved by the subject matters of the independent claims. Advantageous embodiments with expedient developments are the subject of the dependent claims.

• - Überprüfen, ob die Datenverbindung mit dem ersten Kraftfahrzeug anhand des ersten Zustandssignals dem ersten Ladeanschluss zugeordnet werden kann, und wenn nicht:
• - Sperren einer Möglichkeit zu einer Änderung eines Zustands von zumindest einem weiteren Zustandssignal für das zumindest eine weitere Kraftfahrzeug, und
• - Ermöglichen einer Änderung eines Zustands des ersten Zustandssignals für das erste Kraftfahrzeug über die digitale Datenverbindung, und
• - Zuordnen der digitalen Datenverbindung mit dem ersten Kraftfahrzeug zu dem ersten Ladeanschluss, an dem die Zustandsänderung des ersten Zustandssignals festgestellt wird.

The invention is based on a method for allocating a digital data connection between a first motor vehicle and a charging unit, which has a plurality of charging connections, to which at least one further motor vehicle can be connected in addition to the first motor vehicle, to a first of the plurality of charging connections, with which the first one Motor vehicle is connected, wherein the charging unit has only a single common communication unit for the plurality of shop closings, and wherein between the charging unit and the first motor vehicle is applied to the first charging port associated first state signal, comprising the steps:

• Checking whether the data connection with the first motor vehicle can be assigned to the first charging port on the basis of the first status signal, and if not:
• Blocking a possibility for a change of a state of at least one further status signal for the at least one further motor vehicle, and
• - Allowing a change of a state of the first state signal for the first motor vehicle via the digital data connection, and
• - Assigning the digital data connection with the first motor vehicle to the first charging port, at which the state change of the first state signal is detected.

For example, in the method, the first motor vehicle is connected to the first charging port of the charging unit and the at least one further motor vehicle is connected to at least one further charging port of the charging unit. Between the first motor vehicle and the first charging port is the first state signal. The at least one further status signal is applied between the at least one further motor vehicle and the at least one further charging connection. In this case, the respective status signals are assigned to the respective charging connection, in particular unambiguously. For example, the state of the first state signal is equal to the state of the usually another state signal. A communication unit of the charging unit establishes the digital data connection with the first motor vehicle and at least one further digital data connection with the at least one further motor vehicle. In other words, the state of the first state signal is not exclusive to the first state signal. In this case, when checking determined that the digital data connection can not be uniquely assigned to the first charging port.

The charging unit has fewer communication units than charging ports. Therefore, multiple charging ports share a communication unit. For example, the charging unit has exactly one communication unit for all its charging connections. In another example, it is provided that in each case two, three or more charging ports share a common communication unit.

In order to solve this problem, wireline information, namely the respective status signals, and non-wired information, namely the data connections, may be related to each other. Through the steps of disabling, enabling and allocating, it is possible to cause a change in a particular one of the state signals, namely the first state signal, which can be related to the digital data connection. In enabling the state of the first state signal to change for the first motor vehicle, the motor vehicle may be instructed to change the state of the first state signal. For example, the respective states of the first state signal and the at least one further state signal are characterized by a voltage level. The respective states can characterize or specify different phases of a charging process. In addition, different phases of the charging process can be characterized or predetermined by the exchange of data via the digital data connection. By linking or relating the different phases of the charging process, which are predetermined or characterized by the digital data connection and the status signal, the first data connection can be assigned to the first charging connection. In particular, by blocking the change in the state of the at least one further state signal, it can be achieved that a new phase of the state of charge can only be assumed at the first charging connection. In other words, when locking, the possibility of a state change for all motor vehicles which are connected to the charging unit, with the exception of the first motor vehicle locked. In this way, the data connection with the first motor vehicle, which is connected to the first charging port, be assigned after the change of the state in the first charging port.

A further embodiment provides that it is detected that during the checking the data connection in the first charging connection can not be unambiguously assigned if the state of the first state signal and at the same time the state of the at least one further state signal is compatible with a state transmitted via the data connection. If there are several other status signals, then the data connection can not be unambiguously assigned to the first charging connection if the state of the first state signal and, at the same time, the state of one of the further state signals is compatible with the data transmitted over the data connection. Conversely, when checking, the data connection can be unambiguously assigned to the first charging connection if the state determined via the data connection is compatible with exactly one of the state signals, namely the first state signal, at all times. For example, the state of a state signal is compatible with the state transmitted via the data connection if the respective states jointly describe an admissible phase of the charging process (for example, according to ISO 15118). In other words, the two transmitted states can characterize a permissible overall state of the charging process. In other words, the two states can be compatible if they have an inner relationship with each other. Alternatively or additionally, the states may be considered compatible if both states can be assigned to the same phase of the charging process.

• - Erstellen einer ersten Liste, in welcher in einem jeweiligen Eintrag das erste Kraftfahrzeug und das an der Ladeeinheit angeschlossene zumindest eine weitere Kraftfahrzeug aufgelistet sind, welche als Verbindungspartner der Datenverbindung in Frage kommen, und/oder
• - Erstellen einer zweiten Liste, in welcher in einem jeweiligen Eintrag alle Ladeanschlüsse der Ladeeinheit aufgelistet sind, an welchen das erste Kraftfahrzeug angeschlossen sein könnte, und
• - Überprüfen, ob die erste Liste und/oder die zweite Liste mehr als einen Eintrag enthält. Mit anderen Worten wird die erste Liste und/oder die zweite Liste erstellt, in welchen die jeweils infrage kommenden Verbindungspartner aus Sicht der Ladeeinheit (erste Liste) und/oder aus Sicht des ersten Kraftfahrzeugs (zweite Liste) aufgelistet sind. Insbesondere ist vorgesehen, dass für jeden Ladeanschluss eine jeweilige erste Liste erstellt wird, wobei in der jeweiligen ersten Liste alle Kraftfahrzeuge aufgelistet sind, welche dem jeweiligen Ladeanschluss angeschlossen sein könnten und als Verbindungspartner für die Datenverbindung infrage kommen. Insbesondere ist vorgesehen, dass für jedes Kraftfahrzeug, insbesondere das erste Kraftfahrzeug und das zumindest eine weitere Kraftfahrzeug, wenn jeweilige zweite Liste erstellt wird.

A further development provides that the checking whether the data connection can be uniquely assigned takes place according to the following steps:

• - Creating a first list in which in a respective entry the first motor vehicle and the at least one further motor vehicle connected to the charging unit are listed, which come as a connection partner of the data connection in question, and / or
• - Creating a second list in which in a respective entry all charging ports of the charging unit are listed, to which the first motor vehicle could be connected, and
• - Check if the first list and / or the second list contains more than one entry. In other words, the first list and / or the second list is created in which the respective candidate connection partners are listed from the perspective of the charging unit (first list) and / or from the point of view of the first motor vehicle (second list). In particular, it is provided that for each charging port, a respective first list is created, in the respective first list all motor vehicles are listed, which could be connected to the respective charging port and come as a connection partner for the data connection in question. In particular, it is provided that for each motor vehicle, in particular the first motor vehicle and the at least one further motor vehicle, if respective second list is created.

For example, the first motor vehicle and the at least one further motor vehicle come as a connection partner of the data connection in question, if they transmit via the data connection or another data connection a state which is compatible with the state of the first state signal. For example, the first motor vehicle comes as a connection partner of the data connection in question when the state of the first state signal corresponds to the state which is transmitted via the digital data connection. For example, the at least one further motor vehicle comes into question as a connection partner of the data connection when the state of the at least one further state signal corresponds to the state which is transmitted via the digital data connection. In other words, those motor vehicles come as a connection partner for a particular charging port, in this case the first charging port, in question, which transmit the same state via a respective data connection, which is present at the particular charging port, in this case the first charging port.

A further embodiment provides that those of the charging connections of the charging unit are listed in the second list, on which there is a state of the at least one further state signal which is compatible with the state transmitted via the data connection. Thus, in the second list exactly those charging ports of the charging unit are listed, to which the first motor vehicle, which transmits the state via the data connection, could be connected.

A further embodiment provides that, in an additional step, a data connection whose signal strength is lower than a predetermined threshold value is detected as a crosstalking data connection. The crosstalk data links may be received, for example, from adjacent loading units and motor vehicles with which the loading unit has no physical connection. However, these data connections are not relevant to the present charging unit and therefore can be sorted out. For example, the crosstalk data connections from the first and / or the second list are sorted out. Alternatively, the crosstalk data connections are not even included in the first or the second list. In other words, only motor vehicles can be included in the first list, which log on to the charging unit with a data connection whose signal strength exceeds the predetermined threshold. This method is also referred to as SLAC according to the standard ISO 15118.

A further development provides that the data connection between the first motor vehicle and the charging unit is provided via a charging cable by powerline communication (PLC). Powerline communication is a method for establishing the data connection during a charging process of a motor vehicle, which is standardized in the standard ISO 15118. The present method allows the assignment of the data connection even if there is not a separate communication unit for establishing the data connection for each charging connection. Thus, the present method also allows the assignment of the data connection, if, contrary to the standard ISO 15118, the data connection is not established point-to-point, for example, between the first motor vehicle and a separate communication unit of the first charging port.

A further development provides that, before blocking the possibility of changing the state, it is determined whether the at least one further motor vehicle has already blocked the possibility of changing the state signal by the first motor vehicle. In particular, it is determined before blocking the possibility of changing the state whether another of the motor vehicles connected to the charging unit has already blocked the possibility of changing the state. Alternatively or additionally, it is determined before blocking the possibility of changing the state whether the possibility of changing the state has already been previously blocked for the first motor vehicle. In this way it is ensured that the possibility of changing the state is blocked for all but one motor vehicle.

A development provides that the first state signal and the at least one further state signal is formed by a PWM signal. The PWM signal can be standardized in the ISO 15118 standard. This is an analogue signal used to determine basic phases of the charging process. These phases are predetermined, for example, by voltage levels of the state signal. For example, the voltage levels according to the standard ISO 15118 12 V, 9 V, 6 V, 3 V, 0 V and -12 V. The state 9 V can express that a respective motor vehicle is connected to the respective charging port and is not ready for charging , The state 6 V can express that the motor vehicle is ready for loading. At the start of the charging process, the motor vehicle can change the state of the state signal from 9 V to 6 V. For example, it is envisaged that in blocking the possibility of the State change the possibility is locked to change the state from 9 V to 6 V. In this case, it is ensured that only one motor vehicle starts to charge at the same time. The beginning of the charging process can be seen not only on the basis of the status signal but also on the basis of the data connection. Preferably, the data link enabling one of the motor vehicles to change the state of the state signal is assigned to the motor vehicle, which then changes state and starts charging.

• - mehreren Ladeanschlüssen, an welche neben einem ersten Kraftfahrzeug zumindest ein weiteres Kraftfahrzeug anschließbar ist, wobei an jedem der mehreren Ladeanschlüsse ein dem jeweiligen der mehreren Ladeanschlüsse zugeordnetes Zustandssignal aus dem jeweiligen der Kraftfahrzeuge empfangbar ist,
• - einer einzigen gemeinsamen Kommunikationseinheit für die mehreren Ladenschlüsse zum Aufbauen einer digitalen Datenverbindung mit dem ersten Kraftfahrzeug,
• - mit einer Prüfeinheit zum Überprüfen, ob die Datenverbindung mit dem ersten Kraftfahrzeug anhand eines ersten Zustandssignals der jeweiligen Zustandssignale dem ersten Ladeanschluss eindeutig zugeordnet werden kann,
• - mit einem Sperreinheit zum Sperren einer Möglichkeit zu einer Änderung eines Zustands der jeweiligen Zustandssignale durch das zumindest eine weitere Kraftfahrzeug und zum Ermöglichen einer Änderung eines Zustands eines ersten Zustandssignals für das erste Kraftfahrzeug,
• - wobei die Kommunikationseinheit ausgebildet ist, die digitale Datenverbindung mit dem ersten Kraftfahrzeug dem ersten Ladeanschluss zuzuorden, an dem die Zustandsänderung des ersten Zustandssignals festgestellt wird.

Another aspect of the invention relates to a loading unit, with

• a plurality of charging connections to which at least one further motor vehicle can be connected in addition to a first motor vehicle, wherein at each of the plurality of charging connections a status signal assigned to the respective one of the plurality of charging connections can be received from the respective motor vehicle,
• a single common communication unit for the multiple shop closings for establishing a digital data connection with the first motor vehicle,
• with a test unit for checking whether the data connection with the first motor vehicle can be clearly assigned to the first charging connection on the basis of a first status signal of the respective status signals,
• a blocking unit for inhibiting a possibility for a change of a state of the respective status signals by the at least one further motor vehicle and for enabling a change of a state of a first status signal for the first motor vehicle,
• - Wherein the communication unit is configured to assign the digital data connection with the first motor vehicle to the first charging port, at which the state change of the first state signal is detected.

In particular, the loading unit is configured to carry out a method according to one or more of the embodiments described above. For this reason, features of the method according to the invention also form the charging unit according to the invention. Therefore, the features already described in the context of the method according to the invention are not described again here. In particular, the charging unit is set up to charge electric vehicles, ie motor vehicles with electric drive and electrical energy storage, as the motor vehicles.

Further features and advantages will be apparent from the following description with reference to the accompanying figures. In the figures, like reference numerals designate like features and functions. The embodiments are merely illustrative of the invention and are not intended to limit this.

• 1 ein Blockdiagramm einer Ladeeinheit mit mehreren Ladeanschlüsse und daran angeschlossenen Kraftfahrzeugen; und
• 2 ein Ablaufdiagramm einer Ausführungsform des erfindungsgemäßen Verfahrens.

Show it:

• 1 a block diagram of a charging unit with multiple charging ports and connected vehicles; and
• 2 a flow diagram of an embodiment of the method according to the invention.

1 shows a loading unit 1 with multiple charging ports 12 . 13 . 14 . 15 , At the loading unit 1 over the multiple charging ports 12 . 13 . 14 . 15 are connected motor vehicles 2 . 3 . 4 . 5 , The loading unit 1 is to charge an electrical energy storage of motor vehicles 2 . 3 . 4 . 5 educated. The motor vehicles 2 . 3 . 4 . 5 have in particular an electrical energy storage and an electric drive. Preferably, the motor vehicles 2 . 3 . 4 . 5 for electric vehicles or hybrid vehicles. The loading unit 1 is for example designed as a charging station for charging electric vehicle.

The car 2 is at the charging port 12 , the car 3 at the charging port 13 , the car 4 at the charging port 14 and the motor vehicle 5 at the charging port 15 connected to the charging unit. To connect the motor vehicles 2 . 3 . 4 . 5 are respective cable connections 16 intended. Charging the motor vehicles 2 . 3 . 4 . 5 This is done in accordance with the standard ISO 15118. It lies between each of the motor vehicles 2 . 3 . 4 . 5 and the respective one of the charging ports 12 . 13 . 14 . 15 a respective status signal. In the present case, the respective status signal is designed as a PWM signal. Through a voltage level of the PWM signal different phases of the charging process can be described relationships they are determined. For example, the voltage levels according to the standard ISO 15118 12 V, 9 V, 6 V, 3 V, 0 V and -12 V. The state 9 V can express that one of the respective motor vehicles 2 . 3 . 4 . 5 is connected to the respective charging port and is not ready to charge. The state 6 V can express that the respective motor vehicle 2 . 3 . 4 . 5 is ready for loading. The states 12 V and 0 V lie on the side of the respective charging connection 12 . 13 . 14 . 15 or on the side of the respective motor vehicle 2 . 3 . 4 . 5 on, if the respective motor vehicle 2 . 3 . 4 . 5 or the respective charging port 12 . 13 . 14 . 15 are not connected. The -12 V state can indicate an error. The respective states can be determined by a respective state determination unit 11 the charging ports 12 . 13 . 14 . 15 be determined. The PWM connection or the state signal can also be referred to as a PWM channel.

In addition to the PWM connection is also a digital data connection between the vehicles 2 . 3 . 4 . 5 and the loading unit 1 intended. This is set up in accordance with the ISO 15118 standard using powerline communication (PLC). Notwithstanding the standard ISO 15118, the loading unit 1 in the present case, however, only a single communication unit 10 for a plurality of charging ports 12 . 13 . 14 . 15 on. By means of the communication unit 10 be respective data connections with the motor vehicles 2 . 3 . 4 . 5 built up. Only by means of data connections can the motor vehicles 2 . 3 . 4 . 5 but none of the charging ports 12 . 13 . 14 . 15 be assigned. In order to enable this assignment, the present in 2 performed steps described. The digital data connection, in this case by means of powerline communication, can also be referred to as a PLC channel. The registration of the motor vehicle 2 . 3 . 4 . 5 at the loading unit 1 takes place in cooperation of PWM channel and PLC channel.

In one step S1 A first list is created in which all of the motor vehicles 2 . 3 . 4 . 5 are listed, which has a not yet associated data connection with the communication unit 10 have built up. For example, the motor vehicle 5 already for a long time at the loading unit 1 connected and already charging. A digital data connection between the motor vehicle 5 and the communication unit 10 is the motor vehicle 5 already clearly assigned. The status signal of the motor vehicle 5 thus has the state 6 V on. The car 5 is therefore not listed in the first list.

The motor vehicles 2 . 3 . 4 are all just with the charging unit 1 been connected. Thus, the motor vehicles have to 2 . 3 . 4 initially via a respective digital data connection to the charging unit 1 identify, for example, for the payment of electrical energy transferred during charging. As long as the digital data connections, which the motor vehicles 2 . 3 . 4 with the communication unit 10 have built the charging ports 12 . 13 . 14 can not be assigned, is a correct assignment of a charging current, which by one of the motor vehicles 2 . 3 . 4 is requested, to the respective charging port 12 . 13 . 14 at which the charging current is to be delivered, not possible. Thus, it must be determined in which of the charging ports 12 . 13 . 14 each of the motor vehicles 2 . 3 . 4 connected. Because the motor vehicles 2 . 3 . 4 initially are not ready for charging, the states of their state signals initially have the state 9 V on. The motor vehicles 2 . 3 . 4 will be listed in the list.

In the first list, other digital data connections with other motor vehicles could be listed first, which does not physically with the charging unit 1 are connected. This can occur, for example, due to crosstalk from an adjacent charging unit. Therefore, in one step S2 detects all motor vehicles from the first list whose data connection falls below a predetermined signal strength. This method can also be referred to as SLAC. The deletion of the crosstalk data connections takes place in one step S3 , In another, in the 1 not shown, embodiment of the method may alternatively be provided that only such motor vehicles 2 . 3 . 4 be included in the first list whose data connection exceeds the predetermined signal strength. Thus, motor vehicles which are connected via a cross-talk data connection to the charging unit 1 sign up, not included in the first list.

In a further step S4 a second list is created in which each entry has its own entry 12 . 13 . 14 the loading unit 1 are listed to which one of the motor vehicles 2 . 3 . 4 could be connected. In particular, for each of the motor vehicles 2 . 3 . 4 created a respective second list. First, in each of the second lists, each of the charging ports 12 . 13 . 14 listed. The charging port 15 is not listed as this is the motor vehicle 5 assigned.

In one step S5 the motor vehicles report 2 . 3 . 4 by means of the respective digital data connection to the charging unit 1 at. In this case, for example, the messages provided in ISO 15118 are exchanged. During the step S5 can communication between charging unit 1 and motor vehicles 2 . 3 . 4 be stopped for a short time. This is necessary in order to use the status signals to clearly assign the digital data connections to the charging connections 12 . 13 . 14 to enable. The stopping of the communication takes place in particular while the motor vehicles 2 . 3 . 4 to a feedback of the charging unit 1 wait for the respective digital data connection. For example, this is done by stopping a state machine according to the ISO 15118 standard. Advantageously, the state machine stops during a waiting of the motor vehicles 2 . 3 . 4 on a request, which under the name
"Charge_Parameter_Discovery_Response" is standardized. No response time is required for this request, so delays do not lead to a cancellation. According to the standard ISO 15118 is provided that the respective motor vehicle 2 . 3 . 4 after receiving a response to the request
"Charge_Parameter_Discovery_Response" by means of the state signal (ie on the PWM channel) tells it ready to charge. The motor vehicles 2 . 3 . 4 ask by means of the request sending the message
"Charge_Parameter_Discovery_Response" by the charging unit 1 at. Only after receiving the message
"Charge_Parameter_Discovery_Response" can be the motor vehicles 2 . 3 . 4 communicate their respective readiness to charge via the respective status signal. By communicating the readiness for charging by means of the status signal, according to the present exemplary embodiment, the assignment of the digital data connection to the respective one of the charging connections takes place 12 . 13 . 14 , The following steps S6 to S8 can thus be performed while the state machine is stopped and sending the message
"Charge_Parameter_Discovery_Response" by the charging unit 1 is delayed.

In one step S6 It checks whether the respective digital data connections are the motor vehicles 2 . 3 . 4 . 5 or the charging ports 12 . 13 . 14 . 15 can be clearly assigned. For this purpose, it is checked whether the first list and the second list each contain more than one entry. Since this is the case, the digital data connections with the motor vehicles 2 . 3 . 4 the charging ports 12 . 13 . 14 can not be uniquely assigned.

In one step S8 there is the possibility of changing a state of the status signals for all but one of the motor vehicles 2 . 3 . 4 blocked. For this purpose, a so-called state lock or English "lock" is set. First, however, in one step S7 checks if the status lock has already been set. Only in this case is it possible to set the access lock. For example, in the step S8 the possibility of changing the state of the condition signals for the motor vehicles 3 and 4 blocked. The lock ( S8 ) the possibility of changing the state of the condition signals for the motor vehicles 3 . 4 takes place here via the respective digital data connections. In other words, the motor vehicles 2 . 3 . 4 informed via the digital data connection, whether they are allowed to change the state of their respective state signal or change.

The lock in step S8 in particular, by blocking the output of the message
"Charge_Parameter_Discovery_Response". In other words, the motor vehicles 3 . 4 the message
"Charge_Parameter_Discovery_Response" not output. For the motor vehicles 3 and 4 In this embodiment, no deviation from the standard ISO 15118 can be seen, since from the perspective of motor vehicles 3 and 4 only the receipt of the message "Charge_Parameter_Discovery_Response" delayed. As long as the message "Charge_Parameter_Discovery_Response" by a motor vehicle 3 . 4 has not been received, this can not change condition of the status signal. In particular, a change in the state of the state signal from 9 V to 6 V - and thus the beginning of the actual charging - only after receiving the message "Charge_Parameter_Discovery_Response" possible.

Subsequently, in one step S9 for the motor vehicle 2 the change of the state of the respective state signal allows. Enabling the change of state takes place here via the digital data connection. Enabling the state change for the motor vehicle 2 takes place here by outputting the message "Charge_Parameter_Discovery_Response" to the motor vehicle 2 , The message "Charge_Parameter_Discovery_Response" is thereby via the digital data connection to the motor vehicle 2 Posted. In this way, the motor vehicle 2 according to the ISO 15118 standard, the release for changing the state of the status signal. On the step S9 or to the message "Charge_Parameter_Discovery_Response" out changes the motor vehicle 2 its state from 9V to 6V. This will cause the message "Charge_Parameter_Discovery_Response", which has been in step S5 is held back or delayed, now to the motor vehicle 2 Posted.

Subsequently, in one step S10 the car 2 that of the charging ports 12 . 13 . 14 are assigned, at which the change of the state of the state signal is detected. The change of the state of the state signal is, for example, by the respective determination unit 11 recognized. After the motor vehicle 2 the charging port 12 has been clearly assigned, the step S10 the status lock will be canceled again. In the present case, the data connection over which the request "Charge_Parameter_Discovery_Response" was issued is actually the motor vehicle 2 or the charging port 12 at which the state change from 9 V to 6 V was detected.

Subsequently, the method may be, for example, in the step S6 be continued. When re-performing the step S6 are present in the motor vehicles 3 and 4 still none of the charging ports 13 . 14 assigned. Thus, now, for example, for the motor vehicle 3 the change of state of the state signal is disabled. For the motor vehicle 4 the change of the state of the state signal can be enabled. Thus, the motor vehicle can now analogously to above 4 the charging port 14 be assigned. After the motor vehicle 4 the charging port 14 has been assigned, the first list and the second list only one entry at a time. Thus, the motor vehicle 3 the charging port 13 be clearly assigned. Thus, after complete passage of the process all motor vehicles 2 . 3 . 4 . 5 the respective one of the charging ports 12 . 13 . 14 . 15 uniquely assigned.

It can be provided that the steps S1 to S10 for each of the motor vehicles 2 . 3 . 4 be carried out simultaneously or in parallel. In other words, the present method becomes parallel in multiple instances for each of the motor vehicles 2 . 3 . 4 carried out. The different instances can be used, in particular, to swipe clearly assigned motor vehicles 2 . 3 . 4 . 5 from the respective first and / or second lists, as well as for setting the access lock or for checking whether the access lock is set, communicate with each other.

The loading unit 1 in this case has a test unit 20 to check if the data connection with the first motor vehicle 2 based on a first state signal of the respective state signals a first of the charging terminals 12 . 13 . 14 . 15 can be clearly assigned. In other words, the test unit 20 the step S6 carry out. The loading unit 1 especially know a lockout 21 on which in the present the steps S7 . S8 and S9 performs. For example, the test unit 20 and the lock unit 21 formed by logical resources of a microcontroller.

Claims (10)

Method for allocating a digital data connection between a first motor vehicle (2) and a charging unit (1), which has a plurality of charging connections (12, 13, 14, 15) to which, in addition to the first motor vehicle (1), at least one further motor vehicle (3, 4 , 5), to a first of the plurality of charging terminals (12, 13, 14, 15) to which the first motor vehicle (2) is connected, the charging unit (1) having only one common communication unit (10) for a plurality the store terminals (12, 13, 14, 15), and wherein between the charging unit (1) and the first motor vehicle (2) is applied to the first charging port (12) associated with the first state signal, comprising the steps: Checking (S1, S4, S6) whether the data connection with the first motor vehicle (2) can be assigned to the first charging port (12) on the basis of the first status signal, and if not: - Blocking (S8) a possibility to change a state of at least one further state signal for the at least one further motor vehicle (3, 4), and Enabling (S9) a change of a state of the first state signal for the first motor vehicle (2) via the digital data link, and - Assigning (S10) of the digital data connection with the first motor vehicle (2) to the first charging port (1), at which the state change of the first state signal is detected. Method according to Claim 1 , characterized in that it is detected that during the checking the data connection can not be unambiguously assigned to the first charging connection (12) if the state of the first state signal and at the same time the state of the at least one further state signal is compatible with a state transmitted via the data connection , Method according to Claim 1 or 2 , characterized in that the checking whether the data connection can be uniquely assigned by means of the following steps: - Create (S1) a first list in which in a respective entry, the first motor vehicle (2) and connected to the charging unit (1) at least one further motor vehicle (3, 4) are listed, which come as a connection partner of the data connection in question, and / or - creating (S4) a second list in which in a respective entry all charging ports (12, 13, 14) of the charging unit (1) to which the first motor vehicle (2) could be connected, and - checking (S6) whether the first list and / or the second list contains more than one entry. Method according to Claim 2 and 3 , characterized in that the first motor vehicle (2) and the at least one further motor vehicle (3, 4, 5) come as a connection partner of the data connection in question, if they transmit via the data connection or another data connection a state, which with the state of first state signal is compatible. Method according to Claim 2 and 3 or Claim 4 characterized in that those of the charging ports (12, 13, 14, 15) of the charging unit (1) are listed in the second list, at which there is a state of the at least one further state signal compatible with the state transmitted over the data link , Method according to one of the preceding claims, characterized in that the data connection between the first motor vehicle (2) and the charging unit (1) via a charging cable (16) by powerline communication (PLC) is provided. Method according to one of the preceding claims, characterized in that in an additional step (S2, S3) a data connection whose signal strength is lower than a predetermined threshold value is detected as a cross-talk data connection. Method according to one of the preceding claims, characterized in that prior to disabling (S8) the possibility of changing the state is determined (S7), whether the at least one further motor vehicle (3, 4) already has the possibility of changing the state signal by the first motor vehicle (2) has locked. Method according to one of the preceding claims, characterized in that the first state signal and the at least one further state signal is formed by a PWM signal. Charging unit (1), with - Several charging terminals (12, 13, 14, 15), to which in addition to a first motor vehicle (2) at least one further motor vehicle (3, 4, 5) can be connected, wherein at each of the plurality of charging terminals (12, 13, 14, 15 ) a state signal associated with the respective one of the plurality of charging terminals (12, 13, 14, 15) is receivable from the respective one of the motor vehicles (2, 3, 4, 5), a common communication unit (10) for a plurality of the shop terminals (12, 13, 14, 15) for establishing a digital data connection with the first motor vehicle (2), - A test unit (20) for checking whether the data connection with the first motor vehicle (2) based on a first state signal of the respective state signals a first of the charging terminals (12, 13, 14, 15) can be uniquely assigned, and a disable unit (21) for inhibiting a possibility of changing a state of the respective status signals by the at least one further motor vehicle (3, 4) and for enabling a change of a state of the first state signal for the first motor vehicle (2), - wherein the communication unit (10) is adapted to assign the digital data connection with the first motor vehicle (2) to the first charging port (12), at which the state change of the first state signal is detected.

Images