An abnormality determination method and device for vehicle charging starting
By detecting and discharging false voltage through the switching module between the charging station and the vehicle, the charging failure problem caused by false voltage is solved, improving the charging success rate and user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CONTEMPORARY NEBULA TECH ENERGY CO LTD
- Filing Date
- 2023-07-10
- Publication Date
- 2026-07-14
Smart Images
Figure CN122379356A_ABST
Abstract
Description
[0001] This case is a divisional application based on the invention patent filed on July 10, 2023, with application number CN202310837160.0 and titled "A Control Circuit, Method and Device for Charging Start-up". Technical Field
[0002] This invention relates to the field of DC charging pile technology, and in particular to a method and device for judging abnormalities during vehicle charging and starting. Background Technology
[0003] There are two main reasons why charging stations might fail to charge vehicles: First, after plugging in the charging gun and starting the charger, the charging station may fail to charge if the user doesn't start the charger after a long period of inactivity, depending on the vehicle model. This is because some vehicle models enter a dormant state or disable communication with the charging station after prolonged periods of inactivity, requiring the charging gun signal to be re-identified to wake up the vehicle's BMS (Battery Management System). Second, when the vehicle is immediately turned off or charging begins, charging can only start if the voltage at the vehicle's charging port is detected to be less than 10V; otherwise, charging will not proceed. Some vehicle models also monitor the charging port's safety voltage, and due to circuit design issues, this may result in a false voltage (a voltage value can be measured, but there is no actual load capacity).
[0004] Therefore, during testing at the charging station, a false high voltage will be measured. This false voltage can cause electric shock. Furthermore, the charging station will fail to start charging at this time, often requiring the user to unplug and replug the charging gun, or restart the vehicle before normal charging can begin. Summary of the Invention
[0005] The technical problem to be solved by this invention is: how to effectively identify the false voltage encountered when starting a vehicle during charging, so as to avoid electric shock to people caused by the false voltage, and at the same time improve the success rate of charging and starting.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for judging abnormalities during vehicle charging and starting is applied to a control circuit for charging and starting, the control circuit including a charging pile controller, a charging pile power supply module, and a first switch module; The first terminal of the first switch module is connected to the power supply terminal of the charging pile power supply module, the second terminal of the first switch module is used to connect to the vehicle charging module, and the control terminal of the first switch module is connected to the first terminal of the charging pile controller. The first switch module includes a first resistor and a first switch element. The method includes: After detecting that the vehicle charging module is connected, the initial voltage value of the charging pile is obtained; If the initial voltage value is within the specified range, the first switch module will be closed for a preset time to depressurize the charging pile, and the current fluctuation value of the first switch module will be monitored. If the current fluctuation value meets the preset current range, then disconnect the first switch module and record the number of times the first switch is closed or opened by one; otherwise, the initial voltage value is not a virtual voltage. If the number of times the first switch is closed or opened is less than or equal to 3, the current voltage value of the charging pile is obtained. If the current voltage value is less than a specified value, the initial voltage value is a virtual voltage. If the number of times the first switch is continuously closed and opened is greater than or equal to 3, and the current voltage value is not less than the specified value, then the voltage is considered abnormal, and charging is terminated.
[0007] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows: An anomaly detection device for vehicle charging and starting, which executes the anomaly detection method for vehicle charging and starting as described above.
[0008] The beneficial effects of this invention are as follows: It provides a method and device for judging abnormalities during vehicle charging and starting. A first switch module is added between the charging pile power supply module and the vehicle charging module. By using the first switch module, current fluctuation value detection, and voltage value comparison, it is determined whether the initial voltage value is a false voltage or whether there is an abnormality. This avoids electric shock injury caused by false voltage and also prevents charging failure caused by vehicle monitoring circuit problems. In addition, it reduces the number of times the charging gun needs to be plugged in and unplugged, and improves the success rate of charging and starting. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the control circuit for charging start in a method for judging abnormalities in vehicle charging start according to an embodiment of the present invention. Figure 2 This is a circuit diagram of the control circuit for charging start in a method for judging abnormalities in vehicle charging start according to an embodiment of the present invention. Figure 3 The flowchart is a method for judging abnormalities during vehicle charging and starting, provided in an embodiment of the present invention.
[0010] Label Explanation: 11. Charging pile controller; 12. Charging pile power supply module; 13. First switch module; 14. Auxiliary power supply; 15. Second switch module; 16. Third switch module; 17. Fourth switch module; 21. Vehicle controller; 22. Vehicle charging module; R1. First resistor; Q1. Current detection element; K1. Fifth switch; K2. Sixth switch; K3. Third switch; K4. Fourth switch; K7. First switch; K8. Second switch; K9. Seventh switch. Detailed Implementation
[0011] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.
[0012] Please refer to Figure 1 In an embodiment of the present invention, a method for judging abnormalities in vehicle charging start-up includes a charging pile controller, a charging pile power supply module, and a first switch module. The first terminal of the first switch module is connected to the power supply terminal of the charging pile power supply module, the second terminal of the first switch module is used to connect to the vehicle charging module, and the control terminal of the first switch module is connected to the first terminal of the charging pile controller.
[0013] As described above, the beneficial effects of this invention are as follows: A first switch module is added between the charging pile power supply module and the vehicle charging module. The control terminal of the first switch module is connected to the charging pile controller. This module identifies and simulates the discharge of illusory voltages caused by safety voltage detection at the charging pile, thereby avoiding charging start failures due to vehicle safety voltage monitoring circuit problems, which necessitate restarting the vehicle, turning it off, or even unplugging and replugging the charging gun. This invention determines the voltage type through the charging start control circuit and controls the corresponding circuit operation accordingly, improving the charging start success rate and reducing charging failures caused by vehicle monitoring circuit problems, thus enhancing the user experience.
[0014] Furthermore, the first switch module includes a first resistor and a first switch element; the power supply terminal of the charging pile power supply module includes a positive power supply terminal and a negative power supply terminal; the first terminal of the charging pile controller includes a first switch control terminal and a sampling terminal. One end of the first resistor is connected to the positive power supply terminal of the charging pile power supply module, the other end of the first resistor is connected to the first connection terminal of the first switch, and the second connection terminal of the first switch is connected to the negative power supply terminal of the charging pile power supply module. One end of the first resistor is also used to connect to the positive terminal of the vehicle charging module, and the second connection end of the first switch is also used to connect to the negative terminal of the vehicle charging module. The control terminal of the first switch is connected to the first switch control terminal of the charging pile controller; a current detection element is provided between the first resistor and the first switch, and the current detection element is connected to the sampling terminal of the charging pile controller.
[0015] As described above, when the vehicle is performing a safety voltage test, if the detected voltage value is higher than the safety value, the first switch is closed, and the first resistor is turned on to simulate voltage discharge. Because the dummy voltage can be pulled down quickly through the parallel circuit and has no load-carrying capacity, its line current is essentially zero. Therefore, the current detection element can further determine whether the voltage is a dummy voltage. Adding a second switch module can reduce charging failures caused by problems with the vehicle monitoring circuit, thereby reducing the number of times the charging gun needs to be re-plugged in and out, effectively improving the success rate of charging start-up.
[0016] Furthermore, it also includes an auxiliary power supply, a second switching module, and a third switching module; The first terminal of the second switch module is connected to the second terminal of the charging pile controller, and the second terminal of the second switch module is used to connect to the vehicle controller. The first terminal of the third switch module is connected to the power supply terminal of the auxiliary power supply, the second terminal of the third switch module is used to connect to the vehicle controller, and the control terminal of the third switch module is connected to the third terminal of the charging pile controller.
[0017] As described above, when a charging pile fails to charge after being connected to a vehicle, the charging pile controller controls the second and third switch modules to close and open sequentially, thus enabling communication between the charging pile controller and the vehicle controller. This wakes up the vehicle controller to communicate, automatically simulating the operation of unplugging and replugging the charging gun. This avoids the problem of users having to wait for the charging pile to start charging normally before leaving after successfully plugging in the charging gun, effectively improving the user experience.
[0018] Furthermore, the second switch module includes a second switch element; the second terminal of the charging pile controller includes a CC2 terminal and a second switch control terminal; The first connection terminal of the second switch is connected to the CC2 terminal of the charging pile controller, and the second connection terminal of the second switch is used to connect to the CC2 terminal of the vehicle controller; the control terminal of the second switch is connected to the second switch control terminal of the charging pile controller.
[0019] As described above, by controlling the closing and opening of the second switch by the charging pile controller, the process of connecting and disconnecting the CC2 terminal of the charging pile controller and the CC2 terminal of the vehicle controller when plugging and unplugging the charging gun is simulated. This solves the problem that users need to manually operate the plug and unplug the charging gun when the vehicle is in a sleep or communication-blocked state and cannot charge normally.
[0020] Please refer to Figure 3 Another embodiment of the present invention provides a method for judging abnormalities during vehicle charging and starting, including: After detecting that the vehicle charging module is connected, the initial voltage value of the charging pile is obtained; If the initial voltage value is less than the specified value, the auxiliary power supply of the charging pile will be activated for charging; If the initial voltage value is not less than the specified value, the first switch module determines whether the initial voltage value is a false voltage. If it is, the auxiliary power supply of the charging pile is started to charge; otherwise, charging is stopped and an error is reported.
[0021] As described above, the beneficial effects of this invention are as follows: By determining whether the voltage of the charging pile is a false voltage through the first switch module, charging start failures caused by vehicle safety voltage monitoring circuit problems are avoided, requiring the vehicle to be restarted, turned off, or even plugged and unplugged. This invention determines the voltage type through the charging start control circuit and controls the corresponding circuit operation based on the voltage type, improving the success rate of charging start and reducing charging failures caused by vehicle monitoring circuit problems, thus reducing the need for manual plugging and unplugging of the charging gun and enhancing the user experience.
[0022] Furthermore, the step of determining whether the initial voltage value is a phantom voltage through the first switching module includes: Determine whether the initial voltage value meets the specified range. If so, close the first switch module for a preset time to depressurize the charging pile and monitor the current fluctuation value of the first switch module. If the current fluctuation value meets the preset current range, the first switch module is disconnected, and the current voltage value of the charging pile is obtained. If the current voltage value is less than the specified value, the initial voltage value is a virtual voltage. If the current fluctuation value does not conform to the preset current range, then the initial voltage value is not a virtual voltage.
[0023] As described above, the process determines whether the charging pile's voltage value falls within the safe voltage range. If it does, the charging start-up process proceeds. If it doesn't, the first switch module checks if the voltage is a false voltage. Since a false voltage is artificially high, closing the first switch module can quickly lower its value, and since it has no load-carrying capacity, its line current is essentially zero. A real voltage, however, cannot be lowered quickly and has load-carrying capacity, generating a real current. Therefore, by closing the first switch module and monitoring its current fluctuations, the system avoids electric shock injuries from false voltages while simultaneously determining if the voltage is false, reducing charging failures caused by vehicle monitoring circuit issues, and consequently reducing the number of times the charging gun needs to be re-plugged in and out, effectively improving the charging start-up success rate.
[0024] Furthermore, after disconnecting the first switch module, the method further includes: Determine whether the number of times the first switch module is closed or opened meets the preset number range. If so, obtain the current voltage value of the charging pile. Otherwise, end charging and report an error.
[0025] As described above, if the voltage of the charging pile is discharged by repeatedly closing the first switch module, but the voltage value still exceeds the specified value, it is considered that the voltage of the charging pile is not a false voltage and the charging pile does have an abnormality. Therefore, charging is stopped to ensure charging safety.
[0026] Furthermore, the step of determining whether the initial voltage value is a phantom voltage through the first switching module also includes: If the current voltage value is not less than the specified value, then determine whether the current voltage value meets the specified range. If so, return to the step of closing the first switch module for a preset time to depressurize the charging pile.
[0027] As described above, obtaining the real-time voltage value of the charging pile multiple times is used to determine whether the voltage value is a false voltage, avoiding the problem of misjudgment caused by errors in a single detection process, thereby improving the accuracy of the false voltage judgment result.
[0028] Furthermore, the process of activating the auxiliary power supply of the charging pile for charging includes: Start the auxiliary power supply of the charging pile and perform a charging handshake; If a vehicle message is received, charging will begin. If no vehicle message is received, the auxiliary power supply of the charging pile is turned off, the second switch module is disconnected, the second switch module is closed again, and the process returns to the step of starting the auxiliary power supply of the charging pile.
[0029] As described above, the second switch module controls the on / off state of the vehicle identification charging station plug signal line, and wakes up the vehicle communication by disconnecting and then closing the auxiliary power supply again, thereby simulating the action of manually plugging and unplugging the plug and avoiding the problem that the vehicle cannot start charging automatically when it is in a dormant or communication-blocked state.
[0030] This invention provides a control circuit, method, and apparatus for charging start-up, which can be applied to DC charging piles to detect and handle the problem of virtual voltage at the charging port, effectively improving the charging start-up success rate of the charging pile. It can also be used in the EOL (End-of-Line Testing) process of vehicle battery packs to address the problem of high-voltage connector port voltage test failure caused by virtual voltage when the relay is not closed. Specific embodiments are described below: Please refer to Figures 1 to 2 Embodiment 1 of the present invention is as follows: A charging start control circuit includes a charging pile controller 11, a charging pile power supply module 12, and a first switch module 13. Specifically, the first terminal of the first switch module 13 is connected to the power supply terminal of the charging pile power supply module 12, the second terminal of the first switch module 13 is used to connect to the vehicle charging module 22, and the control terminal of the first switch module 13 is connected to the first terminal of the charging pile controller 11.
[0031] The control circuit also includes an auxiliary power supply 14, a second switch module 15, and a third switch module 16. Specifically, the first terminal of the second switch module 15 is connected to the second terminal of the charging pile controller 11, and the second terminal of the second switch module 15 is used to connect to the vehicle controller 21. The first terminal of the third switch module 16 is connected to the power supply terminal of the auxiliary power supply 14, the second terminal of the third switch module 16 is used to connect to the vehicle controller 21, and the control terminal of the third switch module 16 is connected to the third terminal of the charging pile controller 11.
[0032] It should be noted that the connection structure between the charging pile controller 11, the charging pile power supply module 12, the first switch module 13, and the second switch module 15 is as follows: Figure 1 As shown. The wiring ports of the charging pile include CC1, CC2, S-, S+, A-, A+, DC-, DC+, and PE. The wiring ports of the vehicle correspond one-to-one with the wiring ports of the charging pile. Figure 1The charging pile controller 11 and the charging pile power supply module 12 are not shown separately. The wiring ports of the charging pile controller 11 include CC1, CC2, S-, S+, A-, and A+; the wiring ports of the charging pile power supply module 12 include DC- and DC+; PE is the ground wire; the wiring ports of the vehicle controller 21 correspond one-to-one with the wiring ports of the charging pile controller 11, and the wiring ports of the vehicle charging module 22 correspond one-to-one with the wiring ports of the charging pile power supply module 12. Figure 1 The auxiliary power supply 14 and the third switch module 16 are not shown in the diagram.
[0033] In some embodiments, the auxiliary power supply 14 includes a positive power supply A+ and a negative power supply A-, and the third switch module 16 includes a third switch K3 and a fourth switch K4; the positive power supply A+ of the auxiliary power supply 14 is connected to the first connection terminal of the third switch K3, and the second connection terminal of the third switch K3 is used to connect to the charging positive terminal A+ of the vehicle controller 21; the negative power supply A- of the auxiliary power supply 14 is connected to the first connection terminal of the fourth switch K4, and the second connection terminal of the fourth switch K4 is used to connect to the charging negative terminal A- of the vehicle controller 21; the control terminals of the third switch K3 and the fourth switch K4 are both connected to the third terminal of the charging pile controller 11.
[0034] It should be noted that the connection structure between the auxiliary power supply 14, the second switch module 15, and the third switch module 16 is as follows: Figure 2 As shown. The charging pile includes a charging pile controller 11 and a charging pile power supply module 12, and the vehicle to be charged includes a vehicle controller 21 and a vehicle power supply module 22, which is the battery pack of the vehicle to be charged. Figure 2 In the diagram, A+ represents the positive power supply terminal of the auxiliary power supply 14 and the positive charging terminal of the vehicle controller 21, while A- represents the negative power supply terminal of the auxiliary power supply 14 and the negative charging terminal of the vehicle controller 21. Figure 2 The dashed box indicates that the control terminal of the third switch module 16 is connected to the charging pile controller 11, and the connection structure between the control terminal of the second switch module 15 and the charging pile controller 11 is not shown.
[0035] In some embodiments, the input terminals of the charging pile power supply module 12 and the auxiliary power supply 14 are used to connect to AC power.
[0036] The specific structures of the first switch module 13 and the second switch module 15 described below are as follows: The first switch module 13 includes a first resistor R1 and a first switch K7; specifically, the power supply terminal of the charging pile power supply module 12 includes a positive power supply DC+ and a negative power supply DC-; the first terminal of the charging pile controller 11 includes a first switch control terminal and a sampling terminal; one end of the first resistor is connected to the positive power supply DC+ of the charging pile power supply module 12, the other end of the first resistor R1 is connected to the first connection terminal of the first switch K7, and the second connection terminal of the first switch K7 is connected to the negative power supply DC- of the charging pile power supply module 12; one end of the first resistor R1 is also used to connect to the positive charging terminal DC+ of the vehicle charging module 22, and the second connection terminal of the first switch K7 is also used to connect to the negative charging terminal DC- of the vehicle charging module 12; the control terminal of the first switch K7 is connected to the first switch control terminal of the charging pile controller 11; a current detection element Q1 is provided between the first resistor R1 and the first switch K7, and the current detection element Q1 is connected to the sampling terminal of the charging pile controller 11.
[0037] In one optional implementation, the current sensing element Q1 can be a shunt resistor, connected in series with the first resistor R1 and the first switch K7 between the positive power supply DC+ and the negative power supply DC- of the charging pile power supply module 12.
[0038] In another optional embodiment, the current sensing element Q1 can also be a Hall sensor, which is sleeved in the series branch of the first resistor R1 and the first switching element K7. The resistance value of the first resistor R1 ranges from 1kΩ to 20kΩ; in this embodiment, the first resistor R1 is selected as 10kΩ, and can be adjusted proportionally according to the current.
[0039] In some embodiments, the control circuit further includes a fourth switch module 17, the power supply terminal of the charging pile power supply module 12 is connected to the first terminal of the fourth switch module 17, the second terminal of the fourth switch module 17 is connected to the first terminal of the first switch module 13, the second terminal of the first switch module 13 is used to connect to the vehicle charging module 22, and the control terminal of the fourth switch module 17 is connected to the fourth terminal of the charging pile controller 11. (Refer to...) Figure 2Specifically, the fourth switch module 17 includes a fifth switch K1 and a sixth switch K2; the positive power supply DC+ of the charging pile power supply module 12 is connected to the first connection terminal of the fifth switch K1, and the second connection terminal of the fifth switch K1 is connected to one end of the first resistor R1; the negative power supply DC- of the charging pile power supply module 12 is connected to the first connection terminal of the sixth switch K2, and the second connection terminal of the sixth switch K2 is connected to the second connection terminal of the current detection element Q1; the control terminals of the fifth switch K1 and the sixth switch K2 are connected to the fourth terminal of the charging pile controller 11.
[0040] It should be noted that the connection structure between the charging pile power supply module 12, the first switch module 13, and the fourth switch module 17 is as follows: Figure 2 As shown. Figure 2 In the diagram, DC+ represents the positive power supply terminal of the charging pile power supply module 12 and the positive charging terminal of the vehicle charging module 22, while DC- represents the negative power supply terminal of the charging pile power supply module 12 and the negative charging terminal of the vehicle charging module 22. Figure 2 The dashed boxes in the middle indicate that the control terminals of the first switch module 13 and the second switch module 17 are connected to the charging pile controller 11.
[0041] The second switch module 15 includes a second switch component K8; the second terminal of the charging pile controller 11 includes a CC2 terminal and a second switch control terminal; specifically, the first connection terminal of the second switch component K8 is connected to the CC2 terminal of the charging pile controller 11, and the second connection terminal of the second switch component K8 is used to connect to the CC2 terminal of the vehicle controller 21; the control terminal of the second switch component K8 is connected to the second switch control terminal of the charging pile controller 11.
[0042] In some embodiments, the second switch module 15 further includes a seventh switch K9, the first connection terminal of the seventh switch K9 being connected to the equipment ground PE of the charging pile controller 11, the second connection terminal of the seventh switch K9 being connected to the vehicle ground PE of the charging pile controller 11; and the control terminal of the seventh switch K9 being connected to the second switch control terminal of the charging pile controller 11.
[0043] It should be noted that the connection structure between the charging pile controller 11 and the second switch module 15 is as follows: Figure 2 As shown. Figure 2 The connection structure between the control terminal of the seventh switch K9 and the second switch control terminal of the charging pile controller 11 is not shown in the figure.
[0044] In one alternative implementation, the first to seventh switching devices are relays.
[0045] The working principle of this control circuit is as follows: During the physical connection phase of charging pile initiation, charging piles using traditional charging initiation circuits will first detect whether the fifth switch K1 and the sixth switch K2 are closed, and determine the charging pile contactor (i.e. Figure 2 The system checks whether the voltage outside the charging station (at points K1 and K2) is less than the specified voltage. If it is greater than the specified voltage, charging ends. However, because there is insulation resistance between the fifth switch K1 and the sixth switch K2, and because there is a path between the fifth switch K1, the sixth switch K2, and the vehicle ground, a false high voltage will be measured outside the contactor even if both the fifth and sixth switches K1 and K2 are not closed when a sampling resistor is present at the rear end of the fifth switch K1. Similarly, a false high voltage will be measured outside the contactor even if both the fifth and sixth switches K1 and K2 are not closed when a sampling resistor is present at the rear end of the sixth switch K2. This results in a false high voltage being detected at the port when the fifth and sixth switches K1 and K2 are not closed, preventing charging from starting.
[0046] When the charging pile using the charging start control circuit of this invention detects that the fifth switch K1 and the sixth switch K2 are not closed, it determines whether the voltage outside the charging pile contactor is less than the specified voltage. If the voltage is greater than the specified voltage but less than the upper limit of the test voltage, the first switch K7 is closed for a period of time, then opened, and the voltage outside the charging pile contactor is checked again to see if it is less than the specified voltage. If the voltage is less than the specified voltage, charging is started; if the voltage is greater than the specified voltage, the closing and opening of the first switch K7 is repeated, and the voltage is checked again to see if it is less than the specified voltage. If the closing operation of the first switch K7 is repeated multiple times and the voltage is still greater than the specified voltage, the voltage is considered abnormal, and charging is terminated.
[0047] Because the virtual voltage is artificially high, closing the first switch K7 and turning on the first resistor can quickly lower its voltage value. Furthermore, the virtual voltage has no load-carrying capacity, and its line current is essentially zero. In contrast, the real voltage cannot be lowered quickly and has a load-carrying capacity, thus generating a real current. Therefore, by closing the first switch K7 and monitoring the current fluctuation in the circuit using a current detection element, it is possible to determine whether the voltage is virtual.
[0048] Meanwhile, after the charging pile completes the physical connection phase, the auxiliary power supply is started by closing the third switch K3 and the fourth switch K4 to supply power to the vehicle controller, enabling the vehicle controller to communicate. However, since the charging pile still cannot start charging when the vehicle controller is in a sleep or communication-blocked state, the third switch K3 and the fourth switch K4 are first disconnected to turn off the auxiliary power supply. Then, the second switch K8 on the CC2 line between the charging pile controller and the vehicle controller is closed and disconnected to simulate the plugging and unplugging operation. Finally, the third switch K3 and the fourth switch K4 are closed again to start the auxiliary power supply to wake up the vehicle controller.
[0049] Please refer to Figure 3 Embodiment two of the present invention is as follows: A method for detecting anomalies during vehicle charging and starting includes: S1. After detecting that the vehicle charging module is connected, obtain the initial voltage value of the charging pile.
[0050] It should be noted that after the vehicle charging module is detected to be physically connected to the charging gun of the charging pile and the vehicle charging interface, the initial voltage value on the outside of the charging pile contactor is obtained.
[0051] S2. If the initial voltage value is less than the specified value, the auxiliary power supply of the charging pile shall be activated for charging.
[0052] The auxiliary power supply for starting the charging pile includes: S201. Start the auxiliary power supply of the charging pile and perform a charging handshake; S202. If a vehicle message is received, start charging; S203. If no vehicle message is received, shut down the auxiliary power supply of the charging pile, disconnect the second switch module, close the second switch module again, and return to the step of starting the auxiliary power supply of the charging pile.
[0053] It should be noted that the specified value is 10V. In the control circuit, the second switch module is set to the closed state by default; starting and stopping the auxiliary power supply of the charging pile is achieved by closing and opening the third switch module.
[0054] S3. If the initial voltage value is not less than the specified value, the first switch module determines whether the initial voltage value is a false voltage. If it is, the auxiliary power supply of the charging pile is started for charging; otherwise, charging is stopped and an error is reported.
[0055] The step of determining whether the initial voltage value is a virtual voltage through the first switching module includes: S31. Determine whether the initial voltage value meets the specified range. If so, close the first switch module for a preset time to depressurize the charging pile and monitor the current fluctuation value of the first switch module.
[0056] In some embodiments, the specified range is less than or equal to 300V. Due to safety requirements, it is not recommended to attempt this method for voltages higher than 300V. The preset duration is 300ms. In the control circuit, the first switch is closed for 300ms, the first resistor is turned on to depressurize the charging pile, and the current fluctuation value of the current detection element is monitored.
[0057] S32. If the current fluctuation value meets the preset current range, then disconnect the first switch module and obtain the current voltage value of the charging pile.
[0058] The process of disconnecting the first switch module further includes: S3201. Determine whether the number of times the first switch module closes or opens meets the preset number range; S3202. If yes, then obtain the current voltage value of the charging pile; S3203. Otherwise, end charging and report an error.
[0059] In some embodiments, the preset current range is less than or equal to 1A; the preset number of times is less than or equal to 3 times. In the control circuit, when the current fluctuation value is less than or equal to 1A, the first switch is disconnected, and the number of times the first switch is closed or opened is incremented by 1; if the number of times the first switch is closed or opened is less than or equal to 3 times, the current voltage value outside the charging pile contactor is obtained.
[0060] S321. If the current voltage value is less than the specified value, then the initial voltage value is a virtual voltage.
[0061] It should be noted that since the virtual voltage is virtual high, by closing the first switch and turning on the first resistor, its voltage value can be pulled down within 300ms, and the line current detected by the current detection element is basically 0, thus determining that the initial voltage is virtual voltage.
[0062] S322. If the current voltage value is not less than the specified value, determine whether the current voltage value meets the specified range. If so, return to the step of closing the first switch module for a preset time to depressurize the charging pile.
[0063] It should be noted that in the control circuit, if the voltage value is still greater than 10V after the first switch is repeatedly closed and opened three times, the voltage is considered abnormal and charging is stopped.
[0064] S33. If the current fluctuation value does not conform to the preset current range, then the initial voltage value is not a virtual voltage. The charging start control method in this embodiment can be implemented by the charging start control circuit described in Embodiment 1.
[0065] Embodiment 3 of the present invention is as follows: An abnormality detection device for vehicle charging and starting includes a charging and starting control circuit as described in Embodiment 1.
[0066] Furthermore, the abnormal judgment method for vehicle charging and starting described in Embodiment 2 can be implemented in the device through the control circuit of Embodiment 1.
[0067] In summary, the present invention provides a charging start control circuit, anomaly judgment method, and device. A first switch module is added between the charging pile power supply module and the vehicle charging module. The control terminal of the first switch module is connected to the charging pile controller. If the voltage value of the charging pile is within the safe voltage range, the next charging start process is initiated. If the voltage is not within the safe voltage range, the first switch module determines whether the voltage is a false voltage. Since a false voltage is artificially high, closing the first switch module can quickly lower its voltage value. Furthermore, a false voltage has no load-carrying capacity, and its line current is essentially zero. Therefore, by closing the first switch module and monitoring its current fluctuation, the risk of electric shock from a false voltage can be avoided, while simultaneously determining whether the voltage is false, reducing charging failures caused by problems with the vehicle monitoring circuit, and thus reducing the number of times the charging gun needs to be re-plugged, effectively improving the charging start success rate. Simultaneously, the opening and closing of the second switch module controls the on / off of the vehicle's charging gun identification signal line. By disconnecting and then re-closing the auxiliary power supply, the vehicle communication is awakened, simulating the action of manually plugging and unplugging the charging gun, thus preventing the vehicle from failing to automatically start charging when in a dormant or communication-blocked state. This solves the problem of users having to manually plug and unplug the charging gun when the charging station fails to charge properly, thus improving the user experience.
[0068] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.
Claims
1. A method for judging abnormalities during vehicle charging and starting, applied to a control circuit for charging and starting, characterized in that, The control circuit includes a charging pile controller, a charging pile power supply module, and a first switch module. The first terminal of the first switch module is connected to the power supply terminal of the charging pile power supply module, the second terminal of the first switch module is used to connect to the vehicle charging module, and the control terminal of the first switch module is connected to the first terminal of the charging pile controller. The first switch module includes a first resistor and a first switch element. The method includes: After detecting that the vehicle charging module is connected, the initial voltage value of the charging pile is obtained; If the initial voltage value is within the specified range, the first switch module will be closed for a preset time to depressurize the charging pile, and the current fluctuation value of the first switch module will be monitored. If the current fluctuation value meets the preset current range, then disconnect the first switch module and record the number of times the first switch is closed or opened by one; otherwise, the initial voltage value is not a virtual voltage. If the number of times the first switch is closed or opened is less than or equal to 3, the current voltage value of the charging pile is obtained. If the current voltage value is less than a specified value, the initial voltage value is a virtual voltage. If the number of times the first switch is continuously closed and opened is greater than or equal to 3, and the current voltage value is not less than the specified value, then the voltage is considered abnormal, and charging is terminated.
2. The method for judging abnormalities in vehicle charging and starting according to claim 1, characterized in that, Also includes: If the current voltage value is not less than the specified value, then determine whether the current voltage value meets the specified range. If so, return to the step of closing the first switch module for a preset time to depressurize the charging pile.
3. The method for judging abnormalities in vehicle charging and starting according to claim 1, characterized in that, The control circuit also includes an auxiliary power supply and a second switching module; The first terminal of the second switch module is connected to the second terminal of the charging pile controller, and the second terminal of the second switch module is used to connect to the vehicle controller. The method further includes: If the initial voltage value is less than the specified value, the auxiliary power supply of the charging pile is activated to perform a charging handshake. If a vehicle message is received, charging will begin. If no vehicle message is received, the auxiliary power supply of the charging pile is turned off, the second switch module is disconnected, the second switch module is closed again, and the process returns to the step of starting the auxiliary power supply of the charging pile.
4. The method for judging abnormalities in vehicle charging and starting according to claim 1, characterized in that, The power supply terminal of the charging pile power supply module includes a positive power supply terminal and a negative power supply terminal; the first terminal of the charging pile controller includes a first switch control terminal and a sampling terminal. One end of the first resistor is connected to the positive power supply terminal of the charging pile power supply module, the other end of the first resistor is connected to the first connection terminal of the first switch, and the second connection terminal of the first switch is connected to the negative power supply terminal of the charging pile power supply module. One end of the first resistor is also used to connect to the positive terminal of the vehicle charging module, and the second connection end of the first switch is also used to connect to the negative terminal of the vehicle charging module. The control terminal of the first switch is connected to the first switch control terminal of the charging pile controller; a current detection element is provided between the first resistor and the first switch, and the current detection element is connected to the sampling terminal of the charging pile controller.
5. The method for judging abnormalities in vehicle charging and starting according to claim 4, characterized in that, The control circuit also includes a fourth switch module, which includes a fifth switch element and a sixth switch element. The positive power supply terminal of the charging pile power supply module is connected to the first connection terminal of the fifth switch, and the second connection terminal of the fifth switch is connected to one end of the first resistor; the negative power supply terminal of the charging pile power supply module is connected to the first connection terminal of the sixth switch, and the second connection terminal of the sixth switch is connected to the second connection terminal of the current detection element; the control terminals of the fifth and sixth switches are connected to the fourth terminal of the charging pile controller.
6. The method for judging abnormalities in vehicle charging and starting according to claim 5, characterized in that, The condition that the current voltage value is less than the specified value includes: If the fifth and sixth switches are not closed, determine whether the current voltage value is less than the specified value.
7. The method for judging abnormalities in vehicle charging and starting according to claim 3, characterized in that, The second switch module includes a second switch element; the second terminal of the charging pile controller includes a CC2 terminal and a second switch control terminal; The first connection terminal of the second switch is connected to the CC2 terminal of the charging pile controller, and the second connection terminal of the second switch is used to connect to the CC2 terminal of the vehicle controller; The control terminal of the second switch is connected to the second switch control terminal of the charging pile controller; After shutting down the auxiliary power supply of the charging pile, the following is included: The second switch is closed and opened to simulate the insertion and removal of the gun.
8. The method for judging abnormalities in vehicle charging and starting according to claim 1, characterized in that, The specified range is less than or equal to 300V.
9. A device for judging abnormalities during vehicle charging and starting, characterized in that, Perform the abnormal judgment method for vehicle charging and starting as described in any one of claims 1-8.