Charging pile diagnosis method, charging control method, system, program product for direct current charging

Abstract

The application provides a charging pile diagnosis method for direct current charging, which is executed at a vehicle end, and comprises the following steps: when a charging gun is inserted into a charging interface of a vehicle, determining an end voltage of a fast charging circuit at the vehicle end as a reference voltage; when a handshake message sent by the charging pile is received, closing a first side relay of the fast charging circuit at the vehicle end, and determining an end voltage of the fast charging circuit at the vehicle end when the first side relay is closed as a first voltage; comparing a difference between the first voltage and the reference voltage with a voltage threshold value, and if the difference is greater than the voltage threshold value, continuing a charging process; wherein the end voltage of the fast charging circuit at the vehicle end is a voltage of an end of the fast charging circuit at the vehicle end close to the charging pile. A controller, a vehicle-mounted charging system and the like are also provided.

Description

TECHNICAL FIELD

[0001] The present application relates to vehicle technology, and more particularly, to a charging pile diagnosis method for direct current charging. BACKGROUND

[0002] According to the prior art, during the fast charging process of a new energy vehicle, a charging pile and the vehicle form a charging loop, and according to the national standard, a pre-charging circuit of the loop exists on the charging pile side. Therefore, during charging, if the timing of the pile-end relay is abnormal, it will close before the vehicle-end; it is also possible that after the pile-end completes insulation detection, the pile-end double-sided relays are stuck and cannot be disconnected, resulting in that for a vehicle without a reserved fast charging pre-charging circuit, when the vehicle-end fast charging relay is closed, a surge current is generated between the pile-end and the vehicle-end, causing the vehicle-end fast charging relay to stick. It is necessary to propose a solution to this problem. SUMMARY

[0003] According to some embodiments of the present application, a charging pile diagnosis method for direct current charging is provided, the method is executed at the vehicle-end, and the method comprises determining the voltage at the end of the vehicle-end fast charging circuit as a reference voltage when a charging gun is inserted into the charging interface of the vehicle; closing the first side relay of the vehicle-end fast charging circuit and determining the voltage at the end of the vehicle-end fast charging circuit when the first side relay is closed as a first voltage when a handshake message sent by the charging pile is received; comparing the difference between the first voltage and the reference voltage with a voltage threshold value, and if the difference is greater than the voltage threshold value, continuing the charging process; wherein the voltage at the end of the vehicle-end fast charging circuit is the voltage at the end of the vehicle-end fast charging circuit close to the charging pile side.

[0004] As an example, the method can further comprise comparing the difference between the first voltage and the reference voltage with a voltage threshold value, and if the difference is less than the voltage threshold value, then disconnecting the first side relay and closing the second side relay, determining the voltage at the end of the vehicle-end fast charging circuit when the second side relay is closed as a second voltage; comparing the difference between the second voltage and the reference voltage with a voltage threshold value, and if the difference is greater than the voltage threshold value, continuing the charging process; and if the difference is less than the voltage threshold value, indicating that the charging pile is abnormal, terminating the charging.

[0005] As an example, in the method, the first side relay and the second side relay are positive relays and negative relays respectively; or the first side relay and the second side relay are negative relays and positive relays respectively.

[0006] Any of the above methods can be executed by a charging control system of the vehicle.

[0007] According to examples of the present application, a charging control method is also provided, which comprises any of the charging pile diagnosis methods for direct current charging according to examples of the present application.

[0008] According to examples of the present application, there is also provided a controller comprising a memory and a processor. The memory stores program instructions, and the processor executes the program instructions and implements any of the described methods according to the present application during execution.

[0009] According to examples of the present application, there is also provided a vehicle comprising the controller according to the present application, or configured to perform any of the described methods.

[0010] According to examples of the present application, there is also provided a vehicle comprising the controller according to the present application, or configured to perform any of the described methods.

[0011] According to examples of the present application, there is also provided a program product comprising program instructions for implementing any of the described methods when executed by a processor.

[0012] According to examples of the present application, there is also provided a storage medium having stored thereon program instructions for implementing any of the described methods when executed by a processor. BRIEF DESCRIPTION OF DRAWINGS

[0013] The embodiments of the present application will be described in detail hereinafter with reference to the drawings, so as to be more fully understood. In the following description, for the purpose of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present application. It should be noted however that the present application can be practiced without these specific details. In other instances, well known methods and structures have not been described in detail in order to avoid obscuring the present application.

[0014] Figure 1 The fast charging connection circuit when the charging pile and the vehicle are charging is illustrated;

[0015] Figure 2 is a flowchart of a charging pile diagnosis method for direct current charging according to an embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the described embodiments are only part of the embodiments of the technical solutions of the present application, rather than all. All other embodiments obtained by those of ordinary skill in the art based on the embodiments described in the present application file without creative labor are covered by the protection scope of the present application.

[0017] Figure 1 The fast charging connection circuit when the charging pile and the vehicle are charging is illustrated, and hereinafter the charging pile will be referred to as the pile end, and the vehicle will be referred to as the vehicle end. As shown in Figure 1 After the charging pile charging connection is connected to the vehicle charging port, the positive relay 20 and the negative relay 22 of the vehicle end are connected to the corresponding relays 10 and negative relays 12 of the pile end, respectively, thereby forming a charging loop.

[0018] Figure 2 is a flowchart of a charging pile diagnosis method for direct current charging according to an embodiment of the present application. The method is performed by a vehicle to diagnose a charging pile, so as to determine whether to continue a charging procedure. Specifically, the method can be performed by a charging management system of the vehicle, or by a battery management system of the vehicle or other systems or components of the vehicle, as long as the processes of the method can be implemented to diagnose the charging pile.

[0019] For the fast charging circuit, generally, there is a voltage detection module in the vehicle, thus, in the example of the present application, the voltage at the charging pile side of the vehicle-side fast charging circuit can be determined by reading the voltage from the existing voltage detection module. Alternatively, if there is no such detection module in the vehicle, a voltage detection circuit or a voltage sensor can be provided to obtain the voltage.

[0020] At step S202, when the charging gun is detected to be inserted into the charging interface of the vehicle, the voltage at the end of the vehicle-side fast charging circuit is determined as the reference voltage. That is, the voltage at the end of the vehicle-side fast charging circuit close to the charging pile side is determined as the reference voltage. Specifically, before the charging gun and the charging interface are electrically connected but the charging handshake is not completed, the voltage at the end of the vehicle-side fast charging circuit close to the charging pile side is read. The end of the vehicle-side fast charging circuit close to the charging pile side refers to the end of the fast charging circuit electrically connected to the charging pile (more specifically, to the charging gun). In this example, the voltage at the end of the vehicle-side fast charging circuit close to the charging pile side is denoted as Vab. Figure 1 For simplicity, Figure 1 In the example of FIG. 1, the vehicle-side fast charging circuit is connected to the first end AB of the charging pile, that is, the input end of the vehicle-side fast charging circuit is the end of the vehicle-side fast charging circuit close to the charging pile side. Therefore, in this example, when the charging gun is inserted into the charging interface of the vehicle, the voltage Vab at the end AB is obtained as the reference voltage.

[0021] At step S204, when the vehicle end receives the handshake message such as the CML message sent by the pile end, the first side relay of the vehicle-side fast charging circuit is closed, and the first voltage at the charging pile side of the vehicle-side fast charging circuit when the first side relay is closed is determined.

[0022] At step S206, the difference between the first voltage and the reference voltage is calculated, and the difference is compared with a voltage threshold. The voltage threshold is configured in advance. If the difference is greater than the voltage threshold, it indicates that the charging pile is normal, and according to the example, the charging procedure will proceed to step S300.

[0023] When the difference between the first voltage and the reference voltage is less than a voltage threshold, further diagnosis can be performed according to the example of this application. For example, in step S208, the first-side relay is disconnected and the second-side relay is closed, and the second voltage on the charging pile side of the vehicle-side fast charging circuit is determined when the first-side relay is disconnected and the second-side relay is closed. In step S210, the difference between the second voltage and the reference voltage is determined. If the difference between the second voltage and the reference voltage is greater than the voltage threshold, it indicates that the charging pile is normal, and the process proceeds to step S300 to continue the charging process. If the difference between the second voltage and the reference voltage is less than the voltage threshold, it indicates that the charging pile is abnormal. According to the example of this application, in the case of a charging pile abnormality, charging is terminated.

[0024] In combination Figure 2 In the described example, the first-side relay can be a positive relay for the vehicle's fast charging circuit, and correspondingly, the second-side relay is a negative relay for the vehicle's fast charging circuit. Alternatively, if the first-side relay is a negative relay for the vehicle's fast charging circuit, then the second-side relay is a positive relay for the vehicle's fast charging circuit.

[0025] Also refer to Figure 1 and Figure 2 When the charging gun at the charging pile is inserted into the vehicle's charging port, the voltage Vab at the AB end of the fast charging circuit on the vehicle side near the charging pile is obtained (S202). _ 0 is used as the reference voltage. Subsequently, the vehicle receives the CML message sent by the charging pile and closes a single-sided relay, for example, closing the positive relay 20. At this time, the voltage Vab_1 of the AB terminal of the fast charging circuit on the vehicle side near the charging pile is acquired again (S204) and used as the first voltage. The first voltage Vab is calculated. _ 1. The difference between the voltage and the reference voltage Vab_0 is compared with the voltage threshold (S206). If it is greater than the voltage threshold, it indicates that the charging pile is normal, and the charging process continues. If it is less than the voltage threshold, the positive relay 20 is disconnected, the negative relay 10 is closed, and the voltage Vab at the AB end of the fast charging circuit near the charging pile is determined (S208). _ 2. As the second voltage. Calculate the second voltage Vab. _ The difference between the second voltage Vab_2 and the reference voltage Vab_0 is compared with a voltage threshold (S210). If the second voltage Vab_2 and the reference voltage Vab_0 are equal, the difference is calculated. _ If the difference between the voltage values ​​is 0 and the voltage threshold, it indicates that the charging station is normal, and the charging process continues. If the second voltage Vab... _ 2 and reference voltage Vab _ If the difference is less than the voltage threshold, the charging process is terminated.

[0026] According to the national standard GB / T 27930.1, the pile tip will send a CML message after completing the insulation test, at which point the pile tip relay should disconnect. (Reference) Figure 1and Figure 2 After the vehicle end receives the CML message, the single-sided relay of the vehicle end fast charging circuit is closed, and the differential pressure near the pile end at this time is read, i.e., the first voltage Vab_l is obtained. If the two-sided relays of the pile end are stuck, the single-sided relay of the vehicle end is closed at this time, and due to the existence of the large capacitance of the pile end, the mutation of V1 is inhibited. According to the simulation condition, the voltage value of V1 at this time should be less than 10V. If the two-sided relays of the pile end are normally opened, the single-sided relay of the vehicle end is closed at this time, and V1 is approximately equal to half of the voltage of the high-voltage battery pack. Accordingly, the voltage threshold M1 can be determined in advance, i.e., the voltage threshold M1 for judging whether the relays of the pile end are stuck or not is obtained according to the circuit simulation. In order to avoid voltage measurement error, the voltage difference Vab _ 0 is read as a compensation value, and it is judged whether Vab_1-Vab_0 is greater than the voltage threshold M1. If it is greater than M1, the pile end is normal, and the charging can continue.

[0027] If the single-sided relay of the pile end is stuck, the same-side relay of the vehicle end is closed at this time, and the VaD_1 is easily affected by the resistance value of the pile end insulation detection circuit, showing a relatively low voltage level. Considering that the single-sided relay of the pile end is stuck without safety and performance risks, the vehicle end charging can still be carried out. Therefore, in order to avoid the scenario of terminating the charging due to the single-sided relay of the pile end being stuck, according to the example of the present application, in the case that the value of VaD_1-VaD_0 is less than the voltage threshold M1, the charging process is not directly terminated, but a second closing is carried out. The second closing includes opening the closed relay of the current vehicle end fast charging circuit, closing the other-side relay, and reading the voltage VaD_2. If the two-sided relays of the pile end are stuck at this time, due to the large capacitance of the pile end, the mutation of V2 is also inhibited, and the simulation V2 should be less than 10V. It is also judged whether the difference between VaD_2 and Vab_0 (Vab_1-Vab_0) is less than the voltage threshold M1. If it is less than M1, the two-sided relays of the pile end are stuck, and the charging pile is abnormal, the charging is terminated. On the contrary, it indicates that the charging pile is single-sided relay stuck, and the charging process can continue.

[0028] According to the method of the example of the present application, without adding additional hardware settings in the vehicle, the detection of the charging pile by the vehicle end can be carried out through the setting of the diagnostic program in the vehicle end, and the surge current generated by the vehicle end due to the relay sticking or the abnormal closing timing of the charging pile relay can be avoided. For example, even if the fast charging pre-resistor is not added, the vehicle without fast charging pre-resistor can also avoid the problem of fast charging relay sticking caused by closing under load by executing the method of the example of the present application.

[0029] According to the example of the present application, a charging control method is also provided, which includes the charging pile diagnosis method for direct current charging according to the example of the present application.

[0030] According to examples of the present application, there is also provided a controller comprising a memory and a processor. The memory stores program instructions and the processor executes the program instructions and in doing so implements any of the methods described in accordance with embodiments of the present application.

[0031] According to examples of the present application, there is also provided a vehicle comprising a controller as provided by the present application, or configured to perform any of the methods described herein.

[0032] According to examples of the present application, there is also provided a vehicle comprising a controller as provided by the present application, or configured to perform any of the methods described herein.

[0033] While specific embodiments of the application have been shown and described in detail in order to illustrate the principles of the application, it is understood that the application can be embodied otherwise without departing from such principles, for example, technical features of various embodiments / examples / instances of the application combined with each other to form new implementations.

Claims

1. A charging station diagnosis method for direct current charging, characterized by, The method is executed at a vehicle end, and the method comprises: When a charging gun is inserted into a charging interface of a vehicle, determining an end voltage of a vehicle end fast charging circuit as a reference voltage; When a handshake message sent by the charging pile is received, closing a first side relay of the vehicle end fast charging circuit, and determining an end voltage of the vehicle end fast charging circuit when the first side relay is closed as a first voltage; Comparing a difference between the first voltage and the reference voltage with a voltage threshold value, if the difference is greater than the voltage threshold value, continuing a charging process; Comparing a difference between the first voltage and the reference voltage with a voltage threshold value, if the difference is less than the voltage threshold value, then disconnecting the first side relay and closing a second side relay, determining an end voltage of the vehicle end fast charging circuit when the second side relay is closed as a second voltage; Comparing a difference between the second voltage and the reference voltage with a voltage threshold value, if the difference is greater than the voltage threshold value, continuing the charging process; if the difference is less than the voltage threshold value, indicating that the charging pile is abnormal, terminating the charging; The end voltage of the vehicle end fast charging circuit is a voltage of an end of the vehicle end fast charging circuit close to the charging pile.

2. The method of claim 1, wherein, The first side relay and the second side relay are positive relays and negative relays respectively; or the first side relay and the second side relay are negative relays and positive relays respectively.

3. The method according to claim 1 or 2, characterized in that, The method is executed by a charging control system of the vehicle.

4. A charge control method characterized by, The method comprises the charging pile diagnosis method according to any one of claims 1 to 3.

5. A program product, characterized by The program product comprises program instructions, which realize the charging pile diagnosis method according to any one of claims 1 to 2 when executed by a processor.

6. A controller characterized by comprising: The controller comprises a memory and a processor, the memory stores instructions, and the processor realizes the charging pile diagnosis method according to any one of claims 1 to 2 when executing the instructions.

7. An on-board charging system, characterized by The on-board charging system is configured to execute the charging pile diagnosis method according to any one of claims 1 to 2; or comprises the controller according to claim 6.

8. A vehicle characterized by comprising: The vehicle is configured to execute the charging pile diagnosis method according to any one of claims 1 to 3; or comprises the controller according to claim 6.

9. A storage medium having stored thereon program instructions, the program instructions being executable by a processor to cause the processor to execute operations comprising: The program instructions realize the charging pile diagnosis method according to any one of claims 1 to 2 when executed by a processor.

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