Method for carrying out a charging process of an electrically powered vehicle

Abstract

The invention relates to a method for carrying out a charging process of an electrically operated vehicle, comprising at least connecting the vehicle to an electric charging device; starting the charging process; transmitting measured values ​​of applied voltage and flowing charging current determined by the charging device to the vehicle; determining measured values ​​of battery voltage and flowing charging current determined by a control unit of the vehicle; comparing the measured values ​​determined by the charging device with the measured values ​​determined by the control unit; in the event of a deviation above a predefinable limit: outputting an error message.

Description

[0001] The invention relates to a method for carrying out a charging process of an electrically powered vehicle.

[0002] High-voltage batteries in electric vehicles consist of numerous battery cells, a housing, cooling system, and electronic components with measuring technology for current, voltage, and temperature of the cells, as well as a battery management system for determining their state of charge. Key cell states to be determined are the state of charge and the capacity of the battery cells. Accurate determination of these states is crucial for the usability and compliance of the batteries. The aforementioned components can also be spatially separated or integrated into another component. Increasing regulations are further raising the bar for the accuracy and correctness of the measured values ​​and the values ​​calculated by the battery management system. Among other things, a so-called state of certified energy (SOCE) of the battery must be specified. These values ​​significantly influence the residual value of a vehicle.

[0003] Due to the relevance of these values, there could be a motivation to manipulate them, for example, to deceive potential vehicle buyers or to operate the vehicle or battery outside of its specifications and / or regulatory requirements. This deception can be achieved by manipulating the hardware and software, so that the measured values ​​are falsified and consequently incorrect values ​​are calculated and displayed. For example, the resistance of a current sensor could be mechanically altered, changing the current density distribution and resulting in a higher measured current. This excessively high measured current could lead to an overestimated capacity and, consequently, an overly optimistic state of health (SOCE). It is also conceivable that the voltage measurement could be manipulated to measure an excessively high battery voltage, leading to an overestimated battery capacity and, again, an overly optimistic state of health.

[0004] There are various ways, for example in the field of cybersecurity, to prevent manipulation. Encrypted communication or identification of sensor hardware prevents communication from being falsified or the hardware from being replaced. However, these methods do not prevent a false reading from being fabricated through physical modification of the sensor itself.

[0005] Additional sensors can be installed and their readings validated against each other. However, these methods do not detect if the sensors are being consistently manipulated.

[0006] EP 3020597 A1, for example, discloses a charging system that enables communication between the charging system, a server of the charging system, and a vehicle. This system provides protective mechanisms, for example, for emergencies such as power outages or power surges in the electrical grid.

[0007] One object of the invention is to provide an improved method for carrying out a charging process of an electrically powered vehicle.

[0008] The aforementioned problem is solved using the features of an independent claim.

[0009] Favorable embodiments and advantages of the invention will become apparent from the further claims, the description and the drawing.

[0010] According to one aspect of the invention, a method for carrying out a charging process of an electrically operated vehicle is proposed, comprising at least connecting the vehicle to an electric charging device; starting the charging process; transmitting measured values ​​of applied voltage and flowing charging current determined by the charging device to the vehicle; determining measured values ​​of battery voltage and flowing charging current determined by a control unit of the vehicle; comparing the measured values ​​determined by the charging device with the measured values ​​determined by the control unit; in the event of a deviation above a predefinable limit: outputting an error message.

[0011] To detect any manipulation of measured values ​​on the vehicle, the current supplied by the charging device, the applied voltage and, if applicable, the charged energy are determined based on measured values ​​from the charging device and transmitted to the vehicle via communication, in order to then be compared with the vehicle's internal measured values.

[0012] According to the proposed procedure, an error message indicating suspected manipulation of relevant measured values ​​is displayed if there is an indication that one or more measured variables have been impermissibly altered. This message can be displayed in various forms, such as graphically, in words, in monochrome, in color, or flashing, and in different locations, for example, the instrument cluster, head unit, charging port LED, or app.

[0013] The display is controlled by using the sensors of the charging equipment (electric vehicle supply equipment - EVSE) to validate the vehicle's sensor readings. The charging equipment communicates the measured values, such as current and voltage, to the vehicle via a suitable communication channel. This can be done, for example, using a communication protocol via the charging cable or wirelessly. A control unit in the vehicle, such as the battery management system, compares the values ​​transmitted by the charging equipment with the values ​​determined by the battery. A discrepancy in the measured values ​​triggers the output of an error message to detect suspected tampering.

[0014] The proposed method allows for the detection of manipulation of important battery measurements of an electrically powered vehicle.

[0015] This can advantageously prevent or at least greatly hinder the deception of manufacturers, customers and authorities through manipulation of the electronic components of a battery.

[0016] According to an advantageous embodiment of the method, the error information can be output via the charging device and / or via a vehicle-integrated display unit and / or a cloud function and / or an app function. If the measured values ​​deviate above a certain threshold, the driver can thus be provided with appropriate information.

[0017] According to an advantageous embodiment of the method, the measured values ​​of charging current and battery voltage can be determined by the control unit using an average.

[0018] In particular, the control unit can determine the measured values ​​of charging current and battery voltage by averaging them over a predefined period. This allows for a more reliable detection of any deviations in the measured values.

[0019] Discharge processes on a bidirectional charging infrastructure can also be used to advantage. This allows for the more efficient verification of the discharge direction, which is more important for energy extraction.

[0020] According to an advantageous embodiment of the method, the measured values ​​of charging current and applied voltage and / or battery voltage can be processed, in particular multiplied to form a power value, and / or the charging current integrated to form a charge value, and / or the power integrated to form an energy value, and transmitted. Furthermore, other values ​​calculated from the measurement data, such as the charged energy, can be transmitted and compared instead of the measured values ​​themselves. This advantageously reduces the amount of data to be transmitted and / or optimizes the information for relevant target variables.

[0021] Alternatively or additionally, the measured values ​​of charging current and applied voltage and / or battery voltage can be filtered and / or debounced. The measured values ​​can be filtered, for example, using a low-pass filter. This results in a more stable reading and higher reliability of the measured values.

[0022] Electrical / electronic interference on lines can be advantageously eliminated by debouncing. This interference can be of mechanical origin, for example from relays or mechanical switches, or of electronic origin, for example from crosstalk between lines, electromagnetic interference from radiating devices, or electrostatic discharges. Therefore, logical electronic interference suppression measures can also be advantageously implemented at signal inputs of, for example, digital semiconductor circuits.

[0023] According to an advantageous embodiment of the method, if, for example, the deviation exceeds the predefinable limit, the measured values ​​can be validated by charging processes at at least two charging devices. In this way, it can advantageously be determined whether a deviation in the measured values ​​is caused by the charging device or by the vehicle.

[0024] According to an advantageous embodiment of the method, the measured values ​​during the charging process can be determined at a calibrated charging station. This allows for a more reliable determination of the absolute deviation of the measured values ​​between the charging station and the vehicle.

[0025] According to an advantageous embodiment of the method, the measured values ​​can be determined during the charging process at a public and / or designated charging station. This advantageously makes it highly likely that the measured values ​​of the charging station can be manipulated.

[0026] According to an advantageous embodiment of the method, the measured values ​​can be determined during the charging process in customer use and / or during a prescribed test. Such a prescribed test can, for example, be carried out as part of a general inspection of the vehicle.

[0027] According to an advantageous embodiment of the method, an error code can be set if a deviation exceeds the predefined limit. The error code can conveniently be read via diagnostics.

[0028] In particular, the error code can be supplemented with environmental data. This makes it more likely that a context and / or cause of the error can be identified.

[0029] According to an advantageous embodiment of the procedure, the error information can be transmitted to specific users, in particular workshops and / or authorities. In this way, appropriate measures can be initiated if the measured values ​​deviate.

[0030] Further advantages will become apparent from the following description of the drawing. The drawing illustrates an embodiment of the invention. The drawing, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0031] This shows: Fig. 1 a flowchart of the procedure for carrying out a charging process of an electrically powered vehicle according to an embodiment of the invention.

[0032] The figure merely shows an example and is not to be understood as limiting.

[0033] Fig. Figure 1 shows a flowchart of the procedure for carrying out a charging process of an electrically operated vehicle according to an embodiment of the invention.

[0034] According to the proposed procedure, in step S100 the vehicle is electrically connected to an electric charging device, for example a DC charging device.

[0035] The charging process then starts in the usual way in step S102. The charging device continuously determines the current charging current and the current voltage.

[0036] In step S104, the charging device transmits the specified measured values ​​of the flowing charging current and the applied high-voltage voltage to the vehicle.

[0037] Then, in step S106, the vehicle's control unit, for example the battery management system of the high-voltage battery, determines the measured values ​​of charging current and battery voltage. The battery management system can, for example, calculate the average charging current flowing over one minute based on a reading from a current sensor in the battery.

[0038] Furthermore, the measured values ​​can be filtered and / or debounced.

[0039] In step S108, the battery management system averages the measured value communicated by the charging device and transmitted within the vehicle, and in step S110 compares it with the measured value it has determined itself.

[0040] If a deviation exceeds a predefined limit, for example, a deviation greater than 10% of the measured value, an error message is output in step S114. This error message can be output, for example, via the charging device and / or a vehicle-integrated display unit and / or a cloud function and / or an app function.

[0041] In step S114, an error code can be set, which can be supplemented with environmental data. The error code can be read via diagnostics. The environmental data allows for a more likely identification of the context and / or cause of the error.

[0042] The error information can be transmitted to specific users, especially workshops and / or authorities.

[0043] If no deviation above the specified limit value is detected in step S110, the charging process is continued or terminated in step S112.

[0044] If the deviation exceeds the specified limit, the measured values ​​can also be validated by charging processes at at least two charging devices in order to obtain greater certainty in the statement and to exclude deviations due to the measurement of a single charging device.

[0045] It is advantageous to determine the measured values ​​during the charging process using a calibrated charging device. This allows for the determination of absolute values ​​with higher reliability.

[0046] The measured values ​​can conveniently be determined during the charging process at a public and / or designated charging station.

[0047] The measured values ​​can also be determined during the charging process in customer use and / or during a prescribed test. Reference symbol list S100 Connecting the vehicle to a charging device S102 Start of the charging process S104 Transmitting the measured values ​​of current and voltage from the charging device to the vehicle S106 Determining the measured values ​​of current and voltage by the control unit S108 Means of the measured values ​​determined by the charging device S110 Comparison of the measured values ​​determined by the charging device and those determined by the control unit S112 Continue or stop the charging process S114 Output of error information QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 3020597 A1

[0006]

Claims

[1] Method for carrying out a charging process of an electrically powered vehicle, comprising at least Connecting the vehicle to an electric charging device; Starting the charging process; Transmitting measured values ​​of applied voltage and flowing charging current, determined by the charging device, to the vehicle; Determining measured values ​​of battery voltage and charging current using a control unit of the vehicle; Comparing the measured values ​​determined by the charging device with the measured values ​​determined by the control unit; If the deviation exceeds a predefined limit: Output an error message. [2] Method according to claim 1, wherein the fault information is output via the charging device and / or via a vehicle-specific display unit and / or a cloud function and / or an app function. [3] Method according to claim 1 or 2, wherein the measured values ​​of charging current and battery voltage are determined by the control unit on average, in particular wherein the measured values ​​of charging current and battery voltage are determined by the control unit on average over a predefinable period of time. [4] Method according to one of the preceding claims, wherein the measured values ​​of charging current and applied voltage and / or battery voltage are processed, in particular multiplied as a power value and / or the charging current is integrated as a charge value and / or the power is integrated as an energy value, and transmitted, and / or wherein the measured values ​​of charging current and applied voltage and / or battery voltage are filtered and / or debounced. [5] Method according to one of the preceding claims, wherein, if the deviation is above the predefinable limit value, the measured values ​​are validated via charging processes on at least two charging devices. [6] Method according to one of the preceding claims, wherein the measured values ​​are determined during the charging process on a calibrated charging device. [7] Method according to one of the preceding claims, wherein the measured values ​​are determined during the charging process at a public and / or designated charging facility. [8] Method according to one of the preceding claims, wherein the measured values ​​are determined during the charging process in customer use and / or during a prescribed test. [9] Method according to one of the preceding claims, wherein an error code is set in the event of a deviation above the predefinable limit value, in particular wherein the error code is supplemented with environmental data. [10] Method according to one of the preceding claims, wherein the fault information is transmitted to specific users, in particular workshops and / or authorities.

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