Device in electric vehicle, electric vehicle and method

Abstract

The invention relates to a device in an electric vehicle, comprising an insertion hole for charging the electric vehicle, the insertion hole having at least one pin that can be connected to a CC1 line, the insertion hole further having a connection line, and a vehicle control unit, the connecting line connects the pin of the jack with the input end of the vehicle control unit, so that the vehicle control unit can be electrically connected with the CC1 wire. The vehicle control unit is configured to diagnose at least one component involved in the charging of the electric vehicle on the basis of a voltage between the CC1 line and the reference point when the vehicle control unit is electrically connected to the CC1 line via the connecting line.

Description

Technical Field

[0001] The present invention relates to a device in an electric vehicle. In addition, the present invention relates to an electric vehicle and a method for diagnosing at least one component involved in charging the electric vehicle. Background Art

[0002] The GB / T DC standard, such as the part regarding DC charging in standard GB / T 18487.1-2015, utilizes the CC2 wire to identify the plugged-in charging plug from the aspect of the electric vehicle. For this purpose, a resistor R3 is installed in the charging plug according to the GB / T DC standard (see Figure 2 ), which can be recognized by the control device of the electric vehicle.

[0003] If there are electrical or mechanical defects on the CC2 circuit, sometimes the electric vehicle cannot recognize that the charging plug is inserted. Thus, it is possible that the electric vehicle is released for driving operation even though the charging plug is still inserted.

[0004] The charging pile (the external charging device 10 according to Figure 2 ) first recognizes the connection to the electric vehicle again through a resistor R4 installed in the jack (or inlet) of the electric vehicle. The GB / T DC standard stipulates that the CC1 wire terminates in the jack (or inlet) of the electric vehicle.

[0005] The published document DE 102018215696 A1 describes a device for generating a wake-up signal for an electronic device during the plugging process of a charging cable, wherein the device is configured to generate a wake-up signal when a pulse edge appears due to a voltage change and / or a resistance change during or at the time of connection to the plugging process and output it to the electronic device; and wherein the device is furthermore configured to allow the current to flow inside the device during the period when the pulse edge appears, and to suppress the current flow inside the device before the plugging process and after the plugging process ends. Summary of the Invention

[0006] The present invention provides a device in an electric vehicle according to claim 1, an electric vehicle according to claim 9, and a method according to claim 10 for diagnosing at least one component involved in charging the electric vehicle.

[0007] Preferred improvements are the subject matter of the dependent claims.

[0008] Advantages of the Invention

[0009] According to a first aspect, the present invention relates to a device in an electric vehicle, the device comprising: a socket for charging the electric vehicle and a vehicle control unit. The socket has at least one pin that can be connected to the CC1 wire. The socket also has a connection wire that connects the pin of the socket to the input of the vehicle control unit, such that the vehicle control unit can be electrically connected to the CC1 wire. The vehicle control unit is configured to: perform a diagnosis on at least one component participating in the charging of the electric vehicle based on the voltage between the CC1 wire and a reference point when the vehicle control unit is electrically connected to the CC1 wire through the connection wire.

[0010] According to the present invention, redundant information based on the CC1 wire is generated: whether the charging plug is inserted into the electric vehicle. Thus, for example, information from the CC1 wire and the CC2 wire can be compared with each other and verified. Thus, this can help prevent the vehicle from accidentally starting in the plugged-in state in case of suspicion, for example, when the information from the CC1 wire and the CC2 wire does not coincide due to an error.

[0011] Furthermore, according to the present invention, it is possible to identify whether there are errors, such as a short circuit or wire break in the CC1 circuit. This information can be provided as an error message in the system of the electric vehicle. It is also possible to identify whether the switch S (see Figure 1 ) is actuated. Such information can also be utilized inside the electric vehicle.

[0012] In the present invention, it is provided that the CC1 wire from the socket inside the electric vehicle is connected to the wire leading to the control device. As can be Figure 1 seen, then this control device can identify the power supply U1 of the charging pile or the external DC charging device through the resistor R1 (for example, through the input of the analog-to-digital converter (English: “ADC”) of the microcontroller). Since the values of the resistors R1, R2, R4 and the voltage U1 are specified in the GB / T standard, the inserted charging plug can be identified by the defined voltage level. The identification of errors can also be performed through the voltage level that appears, for example, in the case of a short circuit or wire break. The position of the switch S can also be identified by the definable voltage level.

[0013] For example, the above-mentioned reference point can be the ground or the (vehicle) ground wire that is generally equivalent to a conductive body, and a potential zero is generally assigned to the conductive body, and the potential zero represents the reference potential for all signal voltages and operating voltages.

[0014] Furthermore, the present invention relates to an electric vehicle and a method for charging at least one component participating in the charging of the electric vehicle, which have the advantages described above.

[0015] In a preferred embodiment of the device according to the invention in an electric vehicle, it is provided that the vehicle control unit is also set to: when the vehicle control unit is electrically connected to the CC1 conductor via a connecting line, determine based on a voltage whose value is within a first voltage range that the plug for charging the electric vehicle is not inserted into the socket.

[0016] For example, the first voltage range is between 0 and 1 volt.

[0017] In another preferred embodiment of the device according to the invention in an electric vehicle, it is provided that the vehicle control unit is also set to: when the vehicle control unit is electrically connected to the CC1 conductor via a connecting line, determine based on a voltage whose value is within a second voltage range that the plug for charging the electric vehicle is inserted into the socket.

[0018] For example, the second voltage range is between 3.5 and 6.5 volts. It is also possible that the voltage level within the second voltage range is not continuous. As an example, the second voltage range consists of two partial ranges from 3.5 to 4.5 volts and from 6.0 to 6.5 volts, and only the voltage levels within the two partial ranges can be used as a sign for the inserted charging plug. Therefore, a voltage level that is not within the two partial ranges but in the gap between the two partial ranges, such as from 4.5 to 6.0 volts, is regarded as an unreliable voltage.

[0019] In another preferred embodiment of the device according to the invention in an electric vehicle, it is provided that the vehicle control unit is also set to: when the vehicle control unit is electrically connected to the CC1 conductor via a connecting line, determine based on a voltage whose value is within the first partial range of the second voltage range that the plug for charging the electric vehicle is inserted into the socket and the switch provided in the plug and electrically connected to the CC1 conductor and the reference point is closed.

[0020] For example, the first partial range of the second voltage range is between 3.5 and 4.5 volts.

[0021] In another preferred embodiment of the device according to the invention in an electric vehicle, it is provided that the vehicle control unit is also set to: when the vehicle control unit is electrically connected to the CC1 conductor via a connecting line, determine based on a voltage whose value is within the second partial range of the second voltage range that the plug for charging the electric vehicle is inserted into the socket and the switch is open.

[0022] For example, the second partial range of the second voltage range is between 6.0 and 6.5 volts.

[0023] In another preferred embodiment of the device according to the invention in an electric vehicle, it is provided that the vehicle control unit is also configured to: when the vehicle control unit is electrically connected to the CC1 wire via a connection line, determine based on a voltage whose value is within a third voltage range that there is a short circuit in the battery of the electric vehicle.

[0024] For example, the third voltage range is between 9.5 and 15 volts.

[0025] In another preferred embodiment of the device according to the invention in an electric vehicle, it is provided that the vehicle control unit is also configured to: when the vehicle control unit is electrically connected to the CC1 wire via a connection line, determine based on a voltage whose value is approximately zero that there is a short circuit to ground.

[0026] In another preferred embodiment of the device according to the invention in an electric vehicle, it is provided that the vehicle control unit is also configured to: when the vehicle control unit is electrically connected to the CC1 wire via a connection line, compile error information caused by unknown errors and / or wire breaks based on a voltage whose value is greater than zero and not within the first, second, and third voltage ranges.

[0027] For example, a voltage range that is between 3.0 and 3.5 volts and is not within the first, second, and third voltage ranges can be used as a sign of a wire break in the CC1 circuit.

[0028] According to a second aspect, the invention relates to an electric vehicle. The electric vehicle has a battery and the device according to the first aspect.

[0029] According to a third aspect, the invention relates to a method for diagnosing at least one component involved in the charging of an electric vehicle. The method has the following steps: connecting a pin of a socket of the electric vehicle to an input of the vehicle control unit of the electric vehicle via a connection line; connecting the pin to the CC1 wire such that the vehicle control unit is electrically connected to the CC1 wire; and performing a diagnosis on at least one component involved in the charging of the electric vehicle based on the voltage between the CC1 wire and a reference point. Description of the Drawings

[0030] The present invention will be explained in detail below based on the embodiments illustrated in the schematic diagrams. Among them:

[0031] Figure 1 Shows a schematically illustrated DC charging control circuit together with an embodiment of the device according to the invention in an electric vehicle;

[0032] Figure 2 Shows a schematically illustrated DC charging control circuit according to the prior art;

[0033] Figure 3shows a schematically illustrated embodiment of an electric vehicle according to the present invention; and

[0034] Figure 4 shows a schematically illustrated block diagram of an embodiment of a method according to the present invention. Detailed Embodiment

[0035] In the drawings, the same reference numerals denote the same or functionally identical elements.

[0036] Figure 2 shows a schematically illustrated DC charging control circuit according to the prior art, in particular according to the charging standard GB / T 18487.1. In this regard, a basic schematic diagram of a safety protection system for DC charging is shown.

[0037] The safety protection system consists of an external charging device - control device 19, resistors R1, R2, R3, R4 and R5, switch S, contactor C0 on the input side of the AC power supply, current measuring element 12, discharge circuit 14, contactors C1 and C2 of the DC power supply circuit, fuse 16, low-voltage auxiliary current supply circuit 18 (voltage: 12V + / - 10%; current: 10A), switches S3 and S4, vehicle separation devices C5 and C6, and a vehicle control unit 3 that can be integrated into the battery management system of the electric vehicle. Resistors R2 and R3 are arranged in the vehicle plug and resistor R4 is arranged in the vehicle socket or jack. Switch S is an internal switch in the vehicle plug and is normally closed. If the vehicle plug is fully connected to the vehicle socket, switch S closes. During the entire charging process, the external charging device - control device 19 must be able to monitor contactors C1 and C2 and switches S3 and S4. The vehicle control unit 3 for the electric vehicle 1 must be able to monitor the states of the vehicle separation devices C5 and C6 and turn them on and off. The vehicle control unit 3 can be equipped with a function for identifying the low-voltage auxiliary circuit. If the low-voltage auxiliary circuit is fed by the electric vehicle itself, it must be disconnected from the low-voltage auxiliary circuit of the external charging device. The AC input terminal and DC output terminal of the external charging device and the DC output terminal of the auxiliary current supply must be electrically insulated.

[0038] The vehicle coupler 20 is equipped for charging the battery 5 and consists of a vehicle plug and a vehicle socket. The electric vehicle 1, vehicle coupler 20 and external charging device 10 are connected to the ground wire 4.

[0039] The CC2 wire is used to identify the plugged-in charging plug from the aspect of the electric vehicle. For this purpose, a resistor R3 is installed in the charging plug, which can be identified by the vehicle control unit 3 of the electric vehicle 1.

[0040] If there are electrical or mechanical defects in the CC2 circuit, the electric vehicle 1 sometimes cannot recognize that the charging plug is inserted. Thus, it is possible that the electric vehicle 1 is released for driving operation even though the charging plug is still inserted.

[0041] The charging station or the external charging device 10 in turn recognizes the connection to the electric vehicle 1 via a resistor R4 installed in the vehicle socket or jack of the electric vehicle 1. The CC1 wire terminates in the jack of the electric vehicle 1.

[0042] In order to improve the safety protection system for direct current charging of electric vehicles, according to the present invention, the voltage on the CC1 wire can be determined by means of an extension wire leading to the vehicle control unit 3 of the CC1 wire, as shown in Figure 1 shown. In addition to the plug state (plugged in, not plugged in, switch S open or closed), possible electrical errors can also be inferred. That is, the wire may have a short circuit to ground (or to the vehicle ground wire), or it may also have a short circuit relative to the battery positive wire (such as 10 - 14V).

[0043] A short circuit relative to the battery positive wire can be better distinguished from the state "plug is plugged in" based on a high voltage level (such as 10 - 14V). In the case where the plug is plugged in, a voltage of approximately 4V is expected (a voltage divider with U1 = 12V, R1 = 1k ohm, R2 = 1k ohm, R4 = 1k ohm).

[0044] If a high - impedance positive - bias resistor Rx (where Rx >> R1, R2, R4) is switched to the power supply on the CC1 wire inside the charging control unit, the state "plug is not plugged in" can also be distinguished from a "short circuit to ground". In the case of a short circuit to ground, the voltage on the CC1 wire will remain at approximately 0V, while in the state "plug is not plugged in", the voltage will be within a range that can be designed by the circuit.

[0045] Thus, when the resistors and the additional positive - bias circuit are cleverly designed, the exemplary voltage ranges generated on the CC1 wire can generally distinguish the following states / errors:

[0046] System state:

[0047] · Charging plug not inserted: 0 - 1.0V;

[0048] · Charging plug inserted, switch S closed: 3.6 - 4.4V; and

[0049] · Charging plug inserted, switch S open: 5.9 - 6.5V.

[0050] Error:

[0051] · Short circuit to ground: 0V;

[0052] · Short circuit to battery: 9.5 - 15V;

[0053] · Power interruption: 3.1 - 3.6V; and

[0054] · Unreliable voltage: 1.0 - 3.1V; 4.4 - 5.9V; 6.5 - 9.5V.

[0055] The voltage can be read out, for example, using a corresponding voltage divider and an ADC and converted into different system states or error messages.

[0056] These system states or errors can be provided to the system as additional information and used, for example, as error messages for the user. In addition to states that can be determined purely electrically, such as a short circuit to ground or a short circuit to battery, the system can also verify the state of the CC2 wire. Thereby, for example, contradictions in the wire state can be used to generate error messages by comparison (e.g., comparison with the CC1 state: "plug is plugged in", but CC2 state: "plug is not plugged in").

[0057] If a voltage is measured on the CC1 wire that cannot be assigned to a short circuit or a defined system state (see the error case with unreliable voltage above), this voltage can also be used to display an error message. Then this is the following hint: The components involved in charging, such as electric vehicles, electric vehicle supply equipment (EVSE) or charging cables, do not behave according to the standard and can thus be evaluated as defective.

[0058] Figure 3 A schematically illustrated embodiment of an electric vehicle 1 according to the invention is shown. The electric vehicle 1 particularly includes a battery 30, a socket 6, a vehicle control unit 3, and a connection line 2, and the vehicle control unit 3 can be electrically connected to the CC1 wire through the connection line.

[0059] Figure 4 A schematically illustrated block diagram of an embodiment of a method according to the invention is shown, which is used for diagnosing at least one component involved in the charging of an electric vehicle.

[0060] In step S10, the pins of the socket of the electric vehicle are connected to the input of the vehicle control unit of the electric vehicle through a connection line. In step S20, the pins are connected to the CC1 wire so that the vehicle control unit is electrically connected to the CC1 wire. In step S30, a diagnosis is performed for at least one component involved in the charging of the electric vehicle based on the voltage between the CC1 wire and a reference point.

[0061] Although the present invention has been fully described above according to preferred embodiments, the present invention is not limited thereto and can be modified in a variety of ways and methods.

Claims

1. A device in an electric vehicle (1), comprising: A jack (6) for charging the electric vehicle (1) and a vehicle control unit (3), wherein the jack (6) has at least one pin that can be connected to the CC1 wire, wherein the jack (6) further has a connecting wire (2) that connects the pin of the jack (6) to the input of the vehicle control unit (3) such that the vehicle control unit (3) can be electrically connected to the CC1 wire, and wherein the vehicle control unit (3) is configured to: perform a diagnosis on at least one component participating in the charging of the electric vehicle (1) based on the voltage between the CC1 wire and the reference point (4) when the vehicle control unit (3) is electrically connected to the CC1 wire through the connecting wire (2).

2. The device in the electric vehicle (1) according to claim 1, characterized in that, The vehicle control unit (3) is further configured to: determine that the plug for charging the electric vehicle (1) is not inserted into the jack (6) based on a voltage whose value is within a first voltage range when the vehicle control unit (3) is electrically connected to the CC1 wire through the connecting wire.

3. The device in the electric vehicle (1) according to claim 1 or 2, characterized in that, The vehicle control unit (3) is further configured to: determine that the plug for charging the electric vehicle (1) is inserted into the jack (6) based on a voltage whose value is within a second voltage range when the vehicle control unit (3) is electrically connected to the CC1 wire through the connecting wire (2).

4. The device in the electric vehicle (1) according to claim 3, characterized in that, The vehicle control unit (3) is further configured to: determine that the plug for charging the electric vehicle (1) is inserted into the jack (6) and the switch (S) provided in the plug and electrically connected to the CC1 wire and the reference point (4) is closed based on a voltage whose value is within a first part of the second voltage range when the vehicle control unit (3) is electrically connected to the CC1 wire through the connecting wire (2).

5. The device in the electric vehicle (1) according to claim 3 or 4, characterized in that, The vehicle control unit (3) is further configured to: determine that the plug for charging the electric vehicle (1) is inserted into the jack (6) and the switch (S) is open based on a voltage whose value is within a second part of the second voltage range when the vehicle control unit (3) is electrically connected to the CC1 wire through the connecting wire (2).

6. The device in the electric vehicle (1) according to any one of the preceding claims, characterized in that, The vehicle control unit (3) is further configured to: determine that there is a short circuit in the battery (5) of the electric vehicle (1) based on a voltage whose value is within a third voltage range when the vehicle control unit (3) is electrically connected to the CC1 wire through the connecting wire (2).

7. The device in the electric vehicle (1) according to any one of the preceding claims, characterized in that, The vehicle control unit (3) is further configured to: determine that there is a short circuit to ground based on a voltage whose value is approximately zero when the vehicle control unit (3) is electrically connected to the CC1 wire through the connecting wire (2).

8. The device in the electric vehicle (1) according to any one of the preceding claims, characterized in that, The vehicle control unit (3) is further configured to: compile an error message due to an unknown error and / or wire break based on a voltage whose value is greater than zero and not within the first, second, and third voltage ranges when the vehicle control unit (3) is electrically connected to the CC1 wire through the connecting wire (2).

9. An electric vehicle (1) comprising a battery (5) and the device according to any one of the preceding claims.

10. A method for diagnosing at least one component involved in charging an electric vehicle (1), the method having the following steps: Connecting the pins of the socket of the electric vehicle to the input of the vehicle control unit of the electric vehicle through a connecting wire (S10); Connecting the pins to the CC1 wire (S20) so that the vehicle control unit is electrically connected to the CC1 wire; and Performing a diagnosis on at least one component involved in charging the electric vehicle based on the voltage between the CC1 wire and a reference point (S30).

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