Fault diagnosis device and fault diagnosis method for electric vehicle charging system

Abstract

The invention provides a fault diagnosis apparatus and a fault diagnosis method for an electric vehicle charging system. The fault diagnosis device may include: a first terminal node receiving a control pilot (CP) signal from a connector of a charging device through a socket and connected to a positive electrode of a diode; the first node is connected to the negative electrode of the diode; a second node selectively connected to the first terminal node by a switch; a third node connected to the second node through a first resistor; a second terminal node connected to the third node through a second resistor; and a processor configured to measure a first voltage of the first node, a second voltage of the second node, and a third voltage of the third node to diagnose a fault on the CP line.

Description

[0001] Related Application

[0002] This application claims the priority and benefit of Korean Patent Application No. 10-2023-0179572, filed with the Korean Intellectual Property Office on December 12, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a fault diagnosis device and a fault diagnosis method for an electric vehicle charging system. Background Art

[0004] In line with global trends, such as exhaust emission regulations for internal combustion engine vehicles and the introduction of eco-friendly vehicles, the production of internal combustion engine vehicles has decreased and the conversion to electric vehicles has occurred. Accordingly, the construction of infrastructure for charging electric vehicles is also actively underway. An electric vehicle receives electrical energy from the outside, charges a battery using the electrical energy, and then obtains power, which is mechanical energy, through an electric motor connected to the wheels using the voltage charged in the battery. Therefore, it is important to build charging infrastructure for recharging the rechargeable battery of an electric vehicle. When charging an electric vehicle at a charging station, a physical fault such as an open circuit or short circuit of a control pilot (CP) line may occur. Since the CP signal has a key function in charging control, such as requesting the start or stop of power transmission or controlling the amount of power, a fault diagnosis method for the CP line needs to be prepared. In particular, it is necessary to accurately diagnose whether a fault has occurred in the CP line inside the vehicle or in the CP line on the external charging device side. Summary of the Invention

[0005] Embodiments of the present disclosure can provide a fault diagnosis device and a fault diagnosis method for an electric vehicle charging system, which can accurately diagnose a fault on a control pilot (CP) line used when charging an electric vehicle.

[0006] The fault diagnosis device according to an exemplary embodiment may include: a first terminal node that receives a control pilot (CP) signal from a connector of a charging device through a socket and is connected to the positive electrode of a diode; a first node connected to the negative electrode of the diode; a second node selectively connected to the first terminal node through a switch; a third node connected to the second node through a first resistor; a second terminal node connected to the third node through a second resistor; and a processor that measures a first voltage of the first node, a second voltage of the second node, and a third voltage of the third node to diagnose a fault on the CP line.

[0007] The second terminal node may be connected to the third node through a third resistor and a fault diagnosis power supply.

[0008] The second terminal node may be connected to the first node through a fourth resistor.

[0009] When the first voltage, the second voltage, and the third voltage based on Mathematical Formula 1-1, Mathematical Formula 1-2, and Mathematical Formula 1-3 are measured, the processor can diagnose that the CP line is open between the charging device and the socket:

[0010] Mathematical Formula 1-1

[0011]

[0012] Mathematical Formula 1-2

[0013]

[0014] Mathematical Formula 1-3

[0015]

[0016] where R 1 represents the first resistor, R 2 represents the second resistor, R 3 represents the third resistor, R 11 represents the fourth resistor, V 1 represents the first voltage, V 2 represents the second voltage, V 3 represents the third voltage, V Diag represents the voltage of the fault diagnosis power supply, and V D represents the conduction voltage of the diode.

[0017] When the first voltage, the second voltage, and the third voltage based on Mathematical Formula 2-1, Mathematical Formula 2-2, and Mathematical Formula 2-3 are measured, the processor can diagnose that the connector of the charging device is connected to the socket, and the CP line is open between the socket and the first node:

[0018] Mathematical Formula 2-1

[0019] V 1 = 0

[0020] Mathematical Formula 2-2

[0021]

[0022] Mathematical Formula 2-3

[0023]

[0024] where R 1 represents the first resistor, R 2 represents the second resistor, R 3 represents the third resistor, V 1 represents the first voltage, V 2 represents the second voltage, V3 Represents the third voltage, V Diag Represents the voltage of the fault diagnosis power supply, V CP Represents the CP voltage provided by the charging device, and R 31 Represents the resistance of the resistor connected to the output terminal of the CP pulse width modulation (PWM) generation circuit in the charging device.

[0025] When the first voltage, second voltage, and third voltage based on Mathematical Formulas 3-1, 3-2, and 3-3 are measured, the processor can diagnose that the connector of the charging device is not connected to the socket and the CP line is open between the socket and the first node:

[0026] Mathematical Formula 3-1

[0027] V 1 = 0

[0028] Mathematical Formula 3-2

[0029] V 2 = V 3

[0030] Mathematical Formula 3-3

[0031]

[0032] Wherein, R 2 is the second resistor, R 3 is the third resistor, V 1 is the first voltage, V 2 is the second voltage, V 3 is the third voltage, and V Diag is the voltage of the fault diagnosis power supply.

[0033] When the first voltage, second voltage, and third voltage based on Mathematical Formulas 4-1, 4-2, and 4-3 are measured, the processor can diagnose that the connector of the charging device is connected to the socket and the CP line is short-circuited between the charging device and the socket:

[0034] Mathematical Formula 4-1

[0035] V 1 = V EVSE - V D

[0036] Mathematical Formula 4-2

[0037] V 2 = V EVSE

[0038] Mathematical Formula 4-3

[0039]

[0040] Among them, R 1 represents the first resistor, R 2 represents the second resistor, R 3 represents the third resistor, V 1 represents the first voltage, V 2 represents the second voltage, V 3 represents the third voltage, V Diag represents the voltage of the fault diagnosis power supply, and V EVSE represents the power supply voltage of the charging device.

[0041] When the first voltage, the second voltage, and the third voltage based on Mathematical Formula 5-1, Mathematical Formula 5-2, and Mathematical Formula 5-3 are measured, the processor can diagnose that the connector of the charging device is not connected to the socket, and the CP line is short-circuited to the power supply voltage of the charging device between the charging device and the socket:

[0042] Mathematical Formula 5-1

[0043]

[0044] Mathematical Formula 5-2

[0045]

[0046] Mathematical Formula 5-3

[0047]

[0048] Among them, R 1 represents the first resistor, R 2 represents the second resistor, R 3 represents the third resistor, R 11 represents the fourth resistor, V 1 represents the first voltage, V 2 represents the second voltage, V 3 represents the third voltage, V Diag represents the voltage of the fault diagnosis power supply, and V D represents the conduction voltage of the diode.

[0049] When the first voltage, the second voltage, and the third voltage based on Mathematical Formula 6-1, Mathematical Formula 6-2, and Mathematical Formula 6-3 are measured, the processor can diagnose that the CP line is short-circuited to the vehicle power supply voltage between the socket and the first node:

[0050] Mathematical Formula 6-1

[0051] V 1 = V B+ - V D

[0052] Mathematical formula 6-2

[0053] V 2 =V B+

[0054] Mathematical formula 6-3

[0055]

[0056] Among them, R 1 represents the first resistor, R 2 represents the second resistor, R 3 represents the third resistor, V 1 represents the first voltage, V 2 represents the second voltage, V 3 represents the third voltage, V Diag represents the voltage of the fault diagnosis power supply, V B+ represents the vehicle power supply voltage, and V D represents the conduction voltage of the diode.

[0057] When the first voltage, the second voltage, and the third voltage based on Mathematical formula 7-1, Mathematical formula 7-2, and Mathematical formula 7-3 are measured, the processor can diagnose that the connector of the charging device is connected to the socket and the CP line is short-circuited to ground between the charging device and the socket:

[0058] Mathematical formula 7-1

[0059] V 1 =0

[0060] Mathematical formula 7-2

[0061] V 2 =0

[0062] Mathematical formula 7-3

[0063]

[0064] Among them, R 1 represents the first resistor, R 2 represents the second resistor, R 3 represents the third resistor, V 1 represents the first voltage, V 2 represents the second voltage, V 3 represents the third voltage, and V Diag represents the voltage of the fault diagnosis power supply.

[0065] When the first voltage, the second voltage, and the third voltage based on Mathematical formula 8-1, Mathematical formula 8-2, and Mathematical formula 8-3 are measured, the processor can diagnose that the connector of the charging device is not connected to the socket and the CP line is short-circuited to ground between the charging device and the socket:

[0066] Mathematical formula 8-1

[0067]

[0068] Mathematical formula 8-2

[0069]

[0070] Mathematical formula 8-3

[0071]

[0072] Among them, R 1 represents the first resistor, R 2 represents the second resistor, R 3 represents the third resistor, R 11 represents the fourth resistor, V 1 represents the first voltage, V 2 represents the second voltage, V 3 represents the third voltage, V Diag represents the voltage of the fault diagnosis power supply, and V D represents the conduction voltage of the diode.

[0073] When the first voltage, the second voltage, and the third voltage based on Mathematical formula 9-1, Mathematical formula 9-2, and Mathematical formula 9-3 are measured, the processor can diagnose that the CP line is short-circuited to the ground between the socket and the first node:

[0074] Mathematical formula 9-1

[0075] V 1 = 0

[0076] Mathematical formula 9-2

[0077] V 2 = 0

[0078] Mathematical formula 9-3

[0079]

[0080] Among them, R 1 represents the first resistor, R 2 represents the second resistor, R 3 represents the third resistor, V 1 represents the first voltage, V 2 represents the second voltage, V 3 represents the third voltage, and V Diag represents the voltage of the fault diagnosis power supply.

[0081] When the first voltage, the second voltage, and the third voltage based on Mathematical Formula 10-1, Mathematical Formula 10-2, and Mathematical Formula 10-3 are measured, the processor can diagnose that an internal failure of the charging device has occurred:

[0082] Mathematical Formula 10-1

[0083] V 1 = 0

[0084] Mathematical Formula 10-2

[0085]

[0086] Mathematical Formula 10-3

[0087]

[0088] Wherein, R 1 represents the first resistor, R 2 represents the second resistor, R 3 represents the third resistor, V 1 represents the first voltage, V 2 represents the second voltage, V 3 represents the third voltage, V Diag represents the voltage of the fault diagnosis power supply, V CP represents the CP voltage provided by the charging device, and R 31 represents the resistance of the resistor connected to the output terminal of the CP PWM generation circuit in the charging device.

[0089] The fault diagnosis method according to an exemplary embodiment may include: turning on the switch; measuring the first voltage of the first node connected to the negative electrode of the diode, the diode receiving a control pilot (CP) signal from the connector of the charging device through the socket; measuring the second voltage of the second node, the second node being selectively connected to the first terminal node through the switch, the first terminal node being connected to the positive electrode of the diode; measuring the third voltage of the third node connected to the second node through the first resistor; loading data storing the result values calculated according to the predetermined mathematical formulas for each fault type into the memory; and diagnosing a fault on the CP line by comparing the calculated result values with the measured result values of the first voltage, the second voltage, and the third voltage.

[0090] Turning on the switch may include terminating the charging and turning on the switch when the first voltage is recognized to be within a predetermined range during vehicle charging.

[0091] The fault diagnosis method may further include: identifying a fault type when a connector of the charging device is connected to the socket; identifying a fault type when the connector of the charging device is not connected to the socket; and confirming a final fault type by comparing the identified fault type when the charging device is connected to the socket with the identified fault type when the charging device is not connected to the socket. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] Figure 1 is a schematic diagram showing a fault diagnosis device for an electric vehicle charging system according to an exemplary embodiment of the present disclosure;

[0093] Figure 2 is a flowchart showing a fault diagnosis method for an electric vehicle charging system according to an exemplary embodiment of the present disclosure;

[0094] Figure 3 and Figure 4 are diagrams each showing a fault diagnosis device when no fault occurs according to an exemplary embodiment of the present disclosure; and

[0095] Figures 5 to 17 are diagrams each showing a fault diagnosis device when a fault occurs according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0096] Hereinafter, exemplary embodiments of the present disclosure will be described more fully with reference to the accompanying drawings, so that they can be easily practiced by those skilled in the art to which the present disclosure pertains. As those skilled in the art will recognize, the described exemplary embodiments can be modified in various different ways without departing from the spirit or scope of the present disclosure at all. Therefore, the drawings and the description are to be regarded as illustrative in nature and not restrictive. Throughout this specification, the same reference numerals may denote the same elements.

[0097] Throughout this specification and the claims, unless explicitly described to the contrary, the word "comprise" and variations such as "comprises" or "comprising" can be understood to imply the inclusion of the stated elements, but not the exclusion of any other elements. Terms including ordinal numbers such as "first" and "second" may be used to describe various components, but these components do not have to be limited by these terms. These terms may be used only for the purpose of distinguishing one component from another.

[0098] Figure 1 is a diagram showing a fault diagnosis device for an electric vehicle charging system according to an exemplary embodiment.

[0099] See Figure 1, according to an exemplary embodiment, an electric vehicle charging system 1 may include a vehicle 10, a socket 20, a charging device 30, and a connector 40.

[0100] The vehicle 10 may be an environment-friendly vehicle charged by a battery, such as an electric vehicle (EV) or a plug-in hybrid electric vehicle (PHEV). The charging device 30 may be an electric vehicle supply equipment installed at a charging station to charge the battery of the environment-friendly vehicle. The socket 20 may be provided in the vehicle 10 and may be connected to the connector 40 of the charging device 30 to receive power from the charging device 30. In addition, the socket 20 may receive various information about the charging device 30, for example, cable information, charging method, rated voltage, charging time, voltage information, and current information.

[0101] The vehicle 10 may include a first terminal node, a diode 11, a first node, a switch S2, and resistors R11 and R12. The first terminal node corresponding to the positive electrode of the diode 11 may receive a control pilot (CP) signal from the connector 40 of the charging device 30 through the socket 20. On the one hand, the first node corresponding to the negative electrode of the diode 11 may be connected to the ground terminal GND through the resistor R11, and on the other hand, may be connected to the ground terminal GND through the switch S2 and the resistor R12. The vehicle 10 may further include a second terminal node corresponding to the ground terminal GND. The first voltage V of the first node 1 may be a voltage measured for fault diagnosis.

[0102] The vehicle 10 may further include a fault diagnosis device 100. The fault diagnosis device 100 may include a switch S4, a second node, a third node, and resistors R1, R2, and R3. The switch S4 may be used to operate the fault diagnosis device 100. One end of the switch S4 may be connected to the first terminal node, and the other end of the switch S4 may be connected to the second node. That is, the second node may be selectively connected to the first terminal node through the switch S4. One end of the resistor R1 may be connected to the second node, and the other end of the resistor R1 may be connected to the third node. That is, the third node may be connected to the second node through the resistor R1. One end of the resistor R2 may be connected to the third node, and the other end of the resistor R2 may be connected to the second terminal node. That is, the second terminal node may be connected to the third node through the resistor R2. The second terminal node may be connected to the third node through the resistor R3 and a fault diagnosis power supply V Diag connected. The second terminal node may also be connected to the first node through the resistor R11. The second voltage V of the second node 2 and the third voltage V of the third node 3 may be voltages measured for fault diagnosis.

[0103] The charging device 30 may include a CP pulse width modulation (PWM) generation circuit 31 and a resistor R31. The CP PWM generation circuit 31 may output a CP signal in a pulse width modulation form. The interior of the socket 20 and the connector 40 may be visually referred to Figure 1 .

[0104] When charging the vehicle 10, if the first voltage V 1 is recognized as 0V or exceeding 9.56V, the vehicle 10 may generally recognize that the CP line has failed and stop charging. Then, the vehicle 10 may turn on the switch S4 to drive the fault diagnosis device 100 and measure the first voltage V 1 , the second voltage V 2 and the third voltage V 3 to initially diagnose the fault on the CP line. After that, after the user removes the connector 40 and starts the vehicle 10, the vehicle 10 may turn on the switch S4 again to drive the fault diagnosis device 100 and measure the first voltage V 1 , the second voltage V 2 and the third voltage V 3 to secondarily diagnose the fault on the CP line. It can be determined whether the fault occurs in the part of the CP line inside the vehicle 10 or in the part of the CP line outside the vehicle 10, and accordingly, the final fault type can be determined by combining the results of the initial diagnosis and the secondary diagnosis.

[0105] The values of the resistors R1, R2, and R3 may be set to large values that do not affect the allowable voltage range for each basic charging state even when the switch S4 is turned on in a normal state.

[0106] Figure 2 is a flowchart showing a fault diagnosis method for an electric vehicle charging system according to an exemplary embodiment.

[0107] See Figure 2 , according to an exemplary embodiment, a fault diagnosis method for an electric vehicle charging system may perform an operation of connecting a charging connector (operation S201) and an operation of determining whether the first voltage V 1 is recognized as 0V or exceeding 9.56V for a threshold time or longer (operation S202). When it is determined that the first voltage V 1 is not recognized as 0V or exceeding 9.56V for a threshold time or longer, the method may perform an operation of performing charging (operation S203) and an operation of determining whether the first voltage V 1 is recognized as 0V or exceeding 9.56V for a threshold time or longer (operation S204).

[0108] When it is determined that the first voltage V 1When it is recognized that the voltage is 0V or exceeds 9.56V for a threshold time or longer, the method can perform the operations of terminating charging and turning on switch S4 (operation S205); obtaining the first voltage V 1 , the second voltage V 2 , and the third voltage V 3 (operation S206); determining whether the CP line is open or short-circuited (operation S207); and storing the fault diagnosis result of the CP line (operation S208), and then proceeding to operation S216 to terminate the CP line fault diagnosis.

[0109] The method can perform the operation of disconnecting the charging connector (operation S209) and determining whether there is a CP fault diagnosis result (operation S210). If it is determined that there is no CP fault diagnosis result, the method can proceed to operation S216 to terminate the CP line fault diagnosis for the CP line.

[0110] If it is determined that there is a CP fault diagnosis result, the method can perform the operations of turning on switch S4 (operation S211), obtaining the first voltage V 1 , the second voltage V 2 , and the third voltage V 3 (operation S212); determining whether the fault occurs in a part of the CP line between the charging device 30 and the socket 20 or in a part of the CP line between the socket 20 and the first node (operation S213); determining the specific fault type (operation S214); and determining whether the final fault type can be confirmed (operation S215). If it is determined that the final fault type cannot be confirmed, the method can proceed to operation 216 to terminate the CP line fault diagnosis.

[0111] If it is determined that the final fault type can be confirmed, the method can perform the operation of storing the diagnostic trouble code (DTC) (operation S217).

[0112] Figure 3 And Figure 4 are diagrams showing the fault diagnosis device when no fault occurs Figure 1 of the.

[0113] Refer to Figure 3 , when the connector 40 of the charging device 30 is connected to the socket 20, the first voltage V 1 , the second voltage V 2 , and the third voltage V 3 can be as follows:

[0114] (First voltage)

[0115] V 1 = 2.74kI 2

[0116] (Second voltage)

[0117] V 2 = 2.74kI 2 +V D

[0118] (Third voltage)

[0119]

[0120] See Figure 4 , when the connector 40 of the charging device 30 is not connected to the socket 20, the first voltage V 1 , the second voltage V 2 and the third voltage V 3 can be as follows:

[0121] (First voltage)

[0122]

[0123] (Second voltage)

[0124]

[0125] (Third voltage)

[0126]

[0127] Figures 5 to 17 is a diagram showing a fault diagnosis device when a fault occurs Figure 1 .

[0128] The fault diagnosis device 100 may include a processor. The processor may measure the first voltage V of the first node of the fault diagnosis device 100 1 , the second voltage V of the second node 2 and the third voltage V of the third node 3 to diagnose a fault on the CP line. Hereinafter, the first resistor may be a resistor in the fault diagnosis device 100 with one end connected to the second node and the other end connected to the third node, the second resistor may be a resistor in the fault diagnosis device 100 with one end connected to the third node and the other end connected to the second terminal node, and the third resistor may be a resistor with one end connected to the third node and the other end connected to the fault diagnosis power supply V Diag . In addition, for example, the fourth resistor may be a resistor represented as 2.74k connected to the negative electrode of the diode 11 in the vehicle 10.

[0129] See together Figure 5 and Figure 6, when the first voltage V based on Mathematical Formula 1-1, Mathematical Formula 1-2, and Mathematical Formula 1-3 is measured 1 , the second voltage V 2 and the third voltage V 3 , the processor can diagnose that the CP line is open between the charging device 30 and the socket 20.

[0130] (Mathematical Formula 1-1)

[0131]

[0132] (Mathematical Formula 1-2)

[0133]

[0134] (Mathematical Formula 1-3)

[0135]

[0136] Here, R 1 can represent the first resistor, R 2 can represent the second resistor, R 3 can represent the third resistor, R 11 can represent the fourth resistor, V 1 can represent the first voltage, V 2 can represent the second voltage, V 3 can represent the third voltage, V Diag can represent the voltage of the fault diagnosis power supply, and V D can represent the conduction voltage of the diode.

[0137] See Figure 7 , when the first voltage V based on Mathematical Formula 2-1, Mathematical Formula 2-2, and Mathematical Formula 2-3 is measured 1 , the second voltage V 2 and the third voltage V 3 , the processor can diagnose that the connector 40 of the charging device 30 is connected to the socket 20 and the CP line is open between the socket 20 and the first node.

[0138] (Mathematical Formula 2-1)

[0139] V 1 = 0

[0140] (Mathematical Formula 2-2)

[0141]

[0142] (Mathematical Formula 2-3)

[0143]

[0144] Where, R1 may represent the first resistor, R 2 may represent the second resistor, R 3 may represent the third resistor, V 1 may represent the first voltage, V 2 may represent the second voltage, V 3 may represent the third voltage, V Diag may represent the voltage of the fault diagnosis power supply, V CP may represent the CP voltage provided by the charging device 30, and R 31 may represent the resistance of the resistor connected to the output terminal of the CP PWM generation circuit 31 in the charging device 30.

[0145] See Figure 8 , when the first voltage V based on Mathematical Formula 3-1, Mathematical Formula 3-2, and Mathematical Formula 3-3 is measured 1 , the second voltage V 2 , and the third voltage V 3 , the processor can diagnose that the connector 40 of the charging device 30 is not connected to the socket 20, and the CP line is open between the socket 20 and the first node.

[0146] (Mathematical Formula 3-1)

[0147] V 1 = 0

[0148] (Mathematical Formula 3-2)

[0149] V 2 = V 3

[0150] (Mathematical Formula 3-3)

[0151]

[0152] Here, R 2 may represent the second resistor, R 3 may represent the third resistor, V 1 may represent the first voltage, V 2 may represent the second voltage, V 3 may represent the third voltage, and V Diag may represent the voltage of the fault diagnosis power supply.

[0153] See Figure 9 , when the first voltage V based on Mathematical Formula 4-1, Mathematical Formula 4-2, and Mathematical Formula 4-3 is measured 1 , the second voltage V 2 , and the third voltage V 3In this case, the processor can diagnose that the connector 40 of the charging device 30 is connected to the socket 20 and the CP line between the charging device 30 and the socket 20 is short-circuited to the charging device power supply voltage V EVSE .

[0154] (Mathematical formula 4-1)

[0155] V 1 = V EVSE - V D

[0156] (Mathematical formula 4-2)

[0157] V 2 = V EVSE

[0158] (Mathematical formula 4-3)

[0159]

[0160] Here, R 1 can represent the first resistor, R 2 can represent the second resistor, R 3 can represent the third resistor, V 1 can represent the first voltage, V 2 can represent the second voltage, V 3 can represent the third voltage, V Diag can represent the voltage of the fault diagnosis power supply, and V EVSE can represent the charging device power supply voltage.

[0161] See Figure 10 , when the first voltage V 1 , the second voltage V 2 and the third voltage V 3 based on Mathematical formula 5-1, Mathematical formula 5-2 and Mathematical formula 5-3 are measured, the processor can diagnose that the connector 40 of the charging device 30 is not connected to the socket 20, and the CP line is short-circuited to the charging device power supply voltage V EVSE .

[0162] (Mathematical formula 5-1)

[0163]

[0164] (Mathematical formula 5-2)

[0165]

[0166] (Mathematical formula 5-3)

[0167]

[0168] Here, R 1 may represent the first resistor, R 2 may represent the second resistor, R 3 may represent the third resistor, R 11 may represent the fourth resistor, V 1 may represent the first voltage, V 2 may represent the second voltage, V 3 may represent the third voltage, V Diag may represent the voltage of the fault diagnosis power supply, and V D may represent the conduction voltage of the diode.

[0169] Refer together to Figure 11 and Figure 12 , when the first voltage V based on Mathematical Formula 6-1, Mathematical Formula 6-2, and Mathematical Formula 6-3 is measured 1 , the second voltage V 2 , and the third voltage V 3 , the processor can diagnose that the CP line is short-circuited to the vehicle power supply voltage V between the socket 20 and the first node B+ .

[0170] (Mathematical Formula 6-1)

[0171] V 1 = V B+ - V D

[0172] (Mathematical Formula 6-2)

[0173] V 2 = V B+

[0174] (Mathematical Formula 6-3)

[0175]

[0176] Here, R 1 may represent the first resistor, R 2 may represent the second resistor, R 3 may represent the third resistor, V 1 may represent the first voltage, V 2 may represent the second voltage, V 3 may represent the third voltage, V Diag may represent the voltage of the fault diagnosis power supply, V B+ may represent the vehicle power supply voltage, and V D may represent the conduction voltage of the diode.

[0177] Refer to Figure 13 , when the first voltage V based on Mathematical Formula 7-1, Mathematical Formula 7-2, and Mathematical Formula 7-3 is measured1 and the second voltage V 2 and the third voltage V 3 the processor can diagnose that the connector 40 of the charging device 30 is connected to the socket 20 and the CP line is shorted to ground between the charging device 30 and the socket 20.

[0178] (Mathematical formula 7-1)

[0179] V 1 = 0

[0180] (Mathematical formula 7-2)

[0181] V 2 = 0

[0182] (Mathematical formula 7-3)

[0183]

[0184] Here, R 1 can represent the first resistor, R 2 can represent the second resistor, R 3 can represent the third resistor, V 1 can represent the first voltage, V 2 can represent the second voltage, V 3 can represent the third voltage, and V Diag can represent the voltage of the fault diagnosis power supply.

[0185] See Figure 14 , when the first voltage V 1 and the second voltage V 2 and the third voltage V 3 are measured based on Mathematical formula 8-1, Mathematical formula 8-2, and Mathematical formula 8-3, the processor can diagnose that the connector 40 of the charging device 30 is not connected to the socket 20 and the CP line is shorted to ground between the charging device 30 and the socket 20.

[0186] (Mathematical formula 8-1)

[0187]

[0188] (Mathematical formula 8-2)

[0189]

[0190] (Mathematical formula 8-3)

[0191]

[0192] Here, R 1 can represent the first resistor, R 2 can represent the second resistor, R3 may represent the third resistor, R 11 may represent the fourth resistor, V 1 may represent the first voltage, V 2 may represent the second voltage, V 3 may represent the third voltage, V Diag may represent the voltage of the fault diagnosis power supply, and V D may represent the forward voltage of the diode.

[0193] See together Figure 15 and Figure 16 , when the first voltage V based on Mathematical Formulas 9-1, 9-2, and 9-3 is measured 1 , the second voltage V 2 , and the third voltage V 3 , the processor can diagnose that the CP line is short-circuited between the socket 20 and the first node.

[0194] (Mathematical Formula 9-1)

[0195] V 1 = 0

[0196] (Mathematical Formula 9-2)

[0197] V 2 = 0

[0198] (Mathematical Formula 9-3)

[0199]

[0200] Here, R 1 may represent the first resistor, R 2 may represent the second resistor, R 3 may represent the third resistor, V 1 may represent the first voltage, V 2 may represent the second voltage, V 3 may represent the third voltage, and V Diag may represent the voltage of the fault diagnosis power supply.

[0201] See Figure 17 , when the first voltage V based on Mathematical Formulas 10-1, 10-2, and 10-3 is measured 1 , the second voltage V 2 , and the third voltage V 3 , the processor can diagnose that an internal fault of the charging device 30 has occurred. When an internal fault of the charging device 30 occurs, the CP voltage output is -12V. Therefore, the internal fault of the charging device 30 can be distinguished from the faults caused by the open circuit or short circuit of the CP line.

[0202] (Mathematical formula 10-1)

[0203] V 1 = 0

[0204] (Mathematical formula 10-2)

[0205]

[0206] (Mathematical formula 10-3)

[0207]

[0208] Wherein, R 1 can represent the first resistor, R 2 can represent the second resistor, R 3 can represent the third resistor, V 1 can represent the first voltage, V 2 can represent the second voltage, V 3 can represent the third voltage, V Diag can represent the voltage of the fault diagnosis power supply, V CP can represent the CP voltage provided by the charging device 30, and R 31 can represent the resistance of the resistor connected to the output terminal of the CP PWM generation circuit 31 in the charging device 30.

[0209] By loading data into a memory that stores result values calculated according to a predetermined mathematical formula for each fault type, and comparing the calculated result values read out from the memory with, for example, Figures 5 to 17 the measured first voltage V 1 the second voltage V 2 and the third voltage V 3 results, faults on the CP line can be diagnosed.

[0210] According to an exemplary embodiment, when the charging of the electric vehicle stops, faults on the CP line can be accurately diagnosed by the vehicle itself, and when charging cannot be performed due to a fault, a specific fault type can be analyzed and the electric vehicle charging system can be stably stopped, thereby improving the overall reliability and safety of the electric vehicle charging system.

[0211] Although the exemplary embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not necessarily limited thereto. That is, several modifications and changes made by those of ordinary skill in the art to the concepts of the present disclosure defined in the claims that fall within the scope of the present disclosure.

Claims

1. A fault diagnosis device, comprising: a first terminal node configured to receive a control pilot signal from a connector of a charging device through a socket and configured to be connected to an anode of a diode; A first node connected to the cathode of the diode; a second node selectively connected to the first terminal node via a switch; a third node connected to the second node through a first resistor; a second terminal node connected to the third node via a second resistor; as well as A processor is configured to measure a first voltage of the first node, a second voltage of the second node, and a third voltage of the third node to diagnose a fault on a control pilot line.

2. The fault diagnosis device according to claim 1, wherein: The second terminal node is connected to the third node through a third resistor and a fault diagnosis power supply.

3. The fault diagnosis device according to claim 2, wherein: The second terminal node is connected to the first node through a fourth resistor.

4. The fault diagnosis device according to claim 3, wherein: When the first voltage, the second voltage, and the third voltage based on Math Formula 1-1, Math Formula 1-2, and Math Formula 1-3 are measured, the processor is configured to diagnose that the control pilot line is open between the charging device and the socket: (Mathematical formula 1-1) (Mathematical formula 1-2) (Mathematical formula 1-3) Wherein, R1 represents the first resistance of the first resistor, R2 represents the second resistance of the second resistor, R3 represents the third resistance of the third resistor, and R 11 represents the fourth resistance of the fourth resistor, V1 represents the first voltage, V2 represents the second voltage, V3 represents the third voltage, V Diag represents the diagnostic voltage of the fault diagnosis power supply, and V D represents the forward voltage of the diode.

5. The fault diagnosis device according to claim 3, wherein: When the first voltage, the second voltage, and the third voltage based on Math Formula 2-1, Math Formula 2-2, and Math Formula 2-3 are measured, the processor is configured to diagnose that the connector of the charging device is connected to the socket and the control pilot line is open between the socket and the first node: (Mathematical formula 2-1) V1＝0 (Mathematical formula 2-2) (Mathematical formula 2-3) Wherein, R1 represents the first resistance of the first resistor, R2 represents the second resistance of the second resistor, R3 represents the third resistance of the third resistor, V1 represents the first voltage, V2 represents the second voltage, V3 represents the third voltage, V Diag Represents the diagnostic voltage of the fault diagnosis power supply, V CP represents the control pilot voltage provided by the charging device, and R 31 represents a fifth resistance of a fifth resistor connected to the output terminal of the control pilot pulse width modulation generating circuit in the charging device.

6. The fault diagnosis device according to claim 3, wherein: When the first voltage, the second voltage, and the third voltage based on Math Formula 3-1, Math Formula 3-2, and Math Formula 3-3 are measured, the processor is configured to diagnose that the connector of the charging device is not connected to the socket and the control pilot line is open between the socket and the first node: (Mathematical formula 3-1) V1＝0 (Mathematical formula 3-2) V2=V3 (Mathematical formula 3-3) Wherein, R2 represents the second resistance of the second resistor, R3 represents the third resistance of the third resistor, V1 represents the first voltage, V2 represents the second voltage, V3 represents the third voltage, and V Diag Indicates the diagnostic voltage of the fault diagnosis power supply.

7. The fault diagnosis device according to claim 3, wherein: When the first voltage, the second voltage, and the third voltage based on Math Formula 4-1, Math Formula 4-2, and Math Formula 4-3 are measured, the processor is configured to diagnose that the connector of the charging device is connected to the socket and the control pilot line is short-circuited between the charging device and the socket: (Mathematical formula 4-1) V1=V EVSE -V D (Mathematical formula 4-2) <h2 style=";text-align:left;direction:ltr">V2=V<h2 style=";text-align:left;direction:ltr"> EVSE (Mathematical formula 4-3) Wherein, R1 represents the first resistance of the first resistor, R2 represents the second resistance of the second resistor, R3 represents the third resistance of the third resistor, V1 represents the first voltage, V2 represents the second voltage, V3 represents the third voltage, V Diag represents the diagnostic voltage of the fault diagnosis power supply, and V EVSE Indicates the power supply voltage of the charging device.

8. The fault diagnosis device according to claim 3, wherein: When the first voltage, the second voltage, and the third voltage based on Math Formula 5-1, Math Formula 5-2, and Math Formula 5-3 are measured, the processor is configured to diagnose that the connector of the charging device is not connected to the socket and the control pilot line is short-circuited to the charging device power supply voltage between the charging device and the socket: (Mathematical formula 5-1) (Mathematical formula 5-2) (Mathematical formula 5-3) Wherein, R1 represents the first resistance of the first resistor, R2 represents the second resistance of the second resistor, R3 represents the third resistance of the third resistor, and R 11 represents the fourth resistance of the fourth resistor, V1 represents the first voltage, V2 represents the second voltage, V3 represents the third voltage, V Diag represents the diagnostic voltage of the fault diagnosis power supply, and V D represents the forward voltage of the diode.

9. The fault diagnosis device according to claim 3, wherein: When the first voltage, the second voltage, and the third voltage based on Math 6-1, Math 6-2, and Math 6-3 are measured, the processor is configured to diagnose that the control pilot line is short-circuited to the vehicle power supply voltage between the socket and the first node: (Mathematical formula 6-1) V1=V B+ -V D (Mathematical formula 6-2) <h2 style=";text-align:left;direction:ltr">V2=V<h2 style=";text-align:left;direction:ltr"> B+ (Mathematical formula 6-3) Wherein, R1 represents the first resistance of the first resistor, R2 represents the second resistance of the second resistor, R3 represents the third resistance of the third resistor, V1 represents the first voltage, V2 represents the second voltage, V3 represents the third voltage, V Diag Represents the diagnostic voltage of the fault diagnosis power supply, V B+ represents the vehicle supply voltage, and V D represents the forward voltage of the diode.

10. The fault diagnosis device according to claim 3, wherein: When the first voltage, the second voltage, and the third voltage based on Math Formula 7-1, Math Formula 7-2, and Math Formula 7-3 are measured, the processor is configured to diagnose that the connector of the charging device is connected to the socket and the control pilot line is short-circuited to ground between the charging device and the socket: (Mathematical formula 7-1) V1＝0 (Mathematical formula 7-2) V2＝0 (Mathematical formula 7-3) Wherein, R1 represents the first resistance of the first resistor, R2 represents the second resistance of the second resistor, R3 represents the third resistance of the third resistor, V1 represents the first voltage, V2 represents the second voltage, V3 represents the third voltage, and V Diag Indicates the diagnostic voltage of the fault diagnosis power supply.

11. The fault diagnosis device according to claim 3, wherein: When the first voltage, the second voltage, and the third voltage based on Math Formula 8-1, Math Formula 8-2, and Math Formula 8-3 are measured, the processor is configured to diagnose that the connector of the charging device is not connected to the socket and the control pilot line is short-circuited to ground between the charging device and the socket: (Mathematical formula 8-1) (Mathematical formula 8-2) (Mathematical formula 8-3) Wherein, R1 represents the first resistance of the first resistor, R2 represents the second resistance of the second resistor, R3 represents the third resistance of the third resistor, and R 11 represents the fourth resistance of the fourth resistor, V1 represents the first voltage, V2 represents the second voltage, V3 represents the third voltage, V Diag represents the diagnostic voltage of the fault diagnosis power supply, and V D represents the forward voltage of the diode.

12. The fault diagnosis device according to claim 3, wherein: When the first voltage, the second voltage, and the third voltage based on Math Formula 9-1, Math Formula 9-2, and Math Formula 9-3 are measured, the processor is configured to diagnose that the control pilot line is short-circuited to ground between the socket and the first node: (Mathematical formula 9-1) V1＝0 (Mathematical formula 9-2) V2＝0 (Mathematical formula 9-3) Wherein, R1 represents the first resistance of the first resistor, R2 represents the second resistance of the second resistor, R3 represents the third resistance of the third resistor, V1 represents the first voltage, V2 represents the second voltage, V3 represents the third voltage, and V Diag Indicates the diagnostic voltage of the fault diagnosis power supply.

13. The fault diagnosis device according to claim 3, wherein: When the first voltage, the second voltage, and the third voltage based on Math Formula 10-1, Math Formula 10-2, and Math Formula 10-3 are measured, the processor is configured to diagnose that an internal fault of the charging device occurs: (Mathematical formula 10-1) V1＝0 (Mathematical formula 10-2) (Mathematical formula 10-3) Wherein, R1 represents the first resistance of the first resistor, R2 represents the second resistance of the second resistor, R3 represents the third resistance of the third resistor, V1 represents the first voltage, V2 represents the second voltage, V3 represents the third voltage, V Diag Represents the diagnostic voltage of the fault diagnosis power supply, V CP represents the control pilot voltage provided by the charging device, and R 31 denoted by a fifth resistor connected to an output terminal of a control pilot pulse width modulation generating circuit in the charging device.

14. A fault diagnosis method, comprising: Turn on the switch; measuring a first voltage at a first node connected to a cathode of a diode that receives a control pilot signal from a connector of a charging device through a socket; measuring a second voltage at a second node, the second node being selectively connected to a first terminal node through the switch, the first terminal node being connected to an anode of the diode; measuring a third voltage at a third node connected to the second node through the first resistor; Loading data into a memory, wherein the data stores result values ​​calculated according to a predetermined mathematical formula for each fault type; as well as A fault on the control pilot line is diagnosed by comparing the calculated result value with the measured result values ​​of the first voltage, the second voltage, and the third voltage.

15. The fault diagnosis method according to claim 14, wherein: The switching on of the switch includes: Terminate charging; and During vehicle charging, in response to the first voltage being within a predetermined range, the switch is turned on.

16. The fault diagnosis method according to claim 14, further comprising: identifying a first fault type in a first condition in which the connector of the charging device is connected to the receptacle; identifying a second fault type in a second condition in which the connector of the charging device is not connected to the receptacle; as well as A final fault type is confirmed by comparing the first fault type identified in the first situation in which the charging device is connected to the outlet and the second fault type identified in the second situation in which the charging device is not connected to the outlet.

17. A fault diagnosis device, comprising: a first terminal node configured to receive a control pilot signal from a connector of a charging device through a socket and configured to be connected to an anode of a diode; A first node connected to the cathode of the diode; a second node selectively connected to the first terminal node via a switch; a third node connected to the second node through a first resistor; a second terminal node connected to the third node via a second resistor; as well as A processor is configured to measure a first voltage of the first node, a second voltage of the second node, and a third voltage of the third node to diagnose a fault on the control pilot line by loading data storing result values ​​calculated according to a predetermined mathematical formula for each fault type into a memory and comparing the calculated result values ​​with the measured result values ​​of the first voltage, the second voltage, and the third voltage.

18. The fault diagnosis device according to claim 17, wherein: The processor is further configured to: identifying a first fault type in a first condition in which the connector of the charging device is connected to the receptacle; identifying a second fault type in a second condition in which the connector of the charging device is not connected to the receptacle; as well as A final fault type is confirmed by comparing the first fault type identified in the first situation in which the charging device is connected to the outlet and the second fault type identified in the second situation in which the charging device is not connected to the outlet.

19. The fault diagnosis device according to claim 17, wherein: The second terminal node is connected to the third node via a third resistor and a fault diagnosis power supply.

20. The fault diagnosis device according to claim 19, wherein: The second terminal node is connected to the first node through a fourth resistor.

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