An electric vehicle charging control method, control system and vehicle thereof

Abstract

The application discloses a kind of electric vehicle charging control methods, according to vehicle controller, battery management system, vehicle-mounted charger module component carries out information interaction, realize to vehicle charging function, when fault occurs or does not satisfy charging condition in charging process, stop charging process, vehicle enters hibernation state, when vehicle charging condition satisfies, charging process cannot be opened automatically, need to carry out plug and charge condition detection again to enter charging process.The above technical scheme is used, when charging does not satisfy in charging process, the problem that the battery is depleted caused by the fact that vehicle network is repeatedly awakened after vehicle charging is finished and the whole vehicle cannot hibernate is solved, and user experience is improved;After frequent and occasional faults occur in the charging process of the vehicle, the charging process is terminated, which avoids the impact of occasional faults on the safety of the vehicle, and the charging is resumed again after the faults are overcome, improving the safety of the vehicle.

Description

Technical Field

[0001] This invention belongs to the technical field of charging control for new energy vehicles. More specifically, this invention relates to a charging control method for electric vehicles. This invention also relates to its corresponding control system and the vehicle thereof. Background Technology

[0002] With the vigorous development of new energy vehicles, electric vehicles have entered thousands of households and become a daily means of transportation. Currently, most electric vehicle users use household 220V AC power to schedule charging of their vehicles during off-peak hours to save on electricity bills. However, after the charging gun is plugged into the vehicle or a household charger, once the scheduled time arrives, the T-BOX will wake up the on-board charger (OBC), battery management system (BMS), and vehicle controller (VCU). After the VCU detects no serious faults in the vehicle's status, it sends a charging permission signal to the OBC and BMS, and the vehicle enters the charging process. Once the vehicle is fully charged or reaches the preset charging level, the charger and BMS turn off the wake-up source, and charging ends.

[0003] However, this technology has a significant drawback: if a vehicle malfunctions during charging, the VCU will send a charging disallow signal. Upon receiving this signal, the On-Board Charger (OBC) and Battery Management System (BMS) will disable the wake-up signal, and the VCU will enter sleep mode. At this point, the OBC detects that the VCU's charging allow signal is at its initial value, not that charging is prohibited. The OBC then wakes the VCU again, but the VCU detects the vehicle malfunction and disallows charging. The OBC and BMS then disable the wake-up signal again, and the VCU enters sleep mode once more. This repetitive wake-up-sleep cycle causes the vehicle's battery to deplete, ultimately leading to battery depletion.

[0004] In summary, the drawback of the existing technology is that when a pure electric vehicle malfunctions during the charging process using the onboard charging gun and charging station, the entire vehicle network will be repeatedly woken up, leading to battery depletion and potential vehicle safety hazards.

[0005] Using keywords such as "electric vehicle; charging; control; method; system", a search was conducted on existing publicly available technical literature, yielding the following results:

[0006] 1. Chinese patent document: "Electric vehicle charging system and control method based on new energy application", patent (application) number: 201410679543.0; the technical solution described therein is:

[0007] "An electric vehicle charging system based on new energy applications and its control method. The system consists of a photovoltaic power supply system, a wind power supply system, a backup diesel power supply system, and an energy storage system to form a microgrid system for electric vehicle charging stations. The system is controlled by an intelligent control system. When the mains power is normal, the system controls the new energy power supply system to connect with the mains power and operate in a network-connected manner, with the new energy power supply system taking priority in supplying power to the electric vehicle charging piles. When the mains power fails or malfunctions, the connection with the mains power is cut off, and the new energy power supply system, the diesel power supply system, and the energy storage system continue to supply power to the electric vehicle charging piles."

[0008] The technical effects described are:

[0009] "It can balance the electricity demand brought about by the increased electricity load capacity of electric vehicle charging stations, and establish a safe, reliable, noise-free, and pollution-free intelligent charging system for electric vehicles, thus achieving the goal of stable charging of electric vehicles and energy conservation and emission reduction."

[0010] 2. Chinese patent document: "Charging control method, electric vehicle on-board terminal and charging control system", patent (application) number: 201310340024.7; the technical solution described therein is:

[0011] "A charging control method, an electric vehicle on-board terminal, and a charging control system, comprising: receiving a charging control command, which includes a stop charging control command, a charging command at a preset power, or a discharging command; determining whether the charging control command is permitted to be executed based on set charging and discharging conditions; when the charging control command includes a stop charging control command and the charging and discharging conditions indicate that stopping charging is permitted, controlling the electric vehicle's charger to stop charging the electric vehicle's on-board power source; when the charging control command includes a charging command at a preset power and the charging and discharging conditions indicate that charging at a preset power is permitted, controlling the electric vehicle's charger to charge the electric vehicle's on-board power source at a preset power; and when the charging control command includes a discharging command and the charging and discharging conditions indicate that discharging is permitted, controlling the charger to discharge to the power grid."

[0012] The technical effects described are:

[0013] "Intelligent charging for electric vehicles has been achieved."

[0014] However, the technical solutions described in the aforementioned technical documents, as well as the existing publicly available technical solutions, have not been able to solve the problems and defects in the existing technology, such as "battery depletion" and "safety hazards caused by vehicle charging".

[0015] Therefore, there is an urgent need in this field for a charging control and management solution that can keep the vehicle network shut down when a fault occurs and charging stops during the charging process, thus preventing the vehicle network from being repeatedly woken up. Summary of the Invention

[0016] This invention provides an electric vehicle charging control method, the purpose of which is to keep the vehicle network shut down after a fault occurs and charging stops during the charging process, and to prevent the vehicle network from being repeatedly woken up.

[0017] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0018] The electric vehicle charging control method of the present invention includes an electric vehicle comprising a vehicle controller (VCU), an on-board charger (OBC), a battery management system (BMS), and a motor.

[0019] The control method includes the following steps:

[0020] start;

[0021] 1) Insert the charging gun;

[0022] 2) The on-board charger (OBC) and battery management system (BMS) detect whether the vehicle control unit (VCU) sends a charging permission signal; if yes, proceed to the next step; if no, proceed to step 16).

[0023] 3) The on-board charger (OBC) and battery management system (BMS) send a charging wake-up signal to the vehicle control unit (VCU);

[0024] 4) After receiving the charging wake-up signal, the vehicle control unit (VCU) checks and determines whether the battery management system (BMS) self-test is complete and fault-free, and whether the motor self-test is complete and fault-free; if yes, proceed to the next step; if no, proceed to 7).

[0025] 5) The vehicle control unit (VCU) sends a high-voltage charging command to the on-board charger (OBC) and battery management system (BMS);

[0026] 6) After receiving the high voltage charging command, the Battery Management System (BMS) controls the operation of the pre-charge relay, the main charging positive relay, and the main charging negative relay.

[0027] 7) The vehicle control unit (VCU) sequentially checks whether each charging permission condition before timing is met: if any charging permission condition is not met, proceed to step 15); if all charging permission conditions are met, proceed to the next step.

[0028] 8) Start the timer;

[0029] 9) The vehicle control unit (VCU) sends a charging allow initial value command;

[0030] 10) Determine if the timer counts for more than 1 second; if yes, proceed to the next step; if no, return to step 7).

[0031] 11) Vehicle Controller (VCU) determines whether all charging permission conditions are met after the start of timing; if yes, proceed to the next step; if no, issue a charging disallowed flag position signal, and then proceed to 15).

[0032] 12) The vehicle control unit (VCU) sends a charging permission command;

[0033] 13) The on-board charger (OBC) interacts with the battery management system (BMS) and the charging pile to enter the charging process;

[0034] 14) Charging complete; then proceed to 16).

[0035] 15) The vehicle control unit (VCU) sends a charging disallow command; then proceeds to the next step;

[0036] 16) The on-board charger (OBC) or battery management system (BMS) disables the charging wake-up signal;

[0037] 17) The vehicle control unit (VCU) enters sleep mode;

[0038] 18) Electric vehicles have entered a dormant state;

[0039] Finish.

[0040] In step 7), the charging permission conditions are determined in the following order: Condition 1, Condition 2, Condition 3, and Condition 4. Condition 1 is that the charging gun is connected. Condition 2 is that the vehicle has no serious malfunctions and the handbrake is engaged. Condition 3 is that the charging disallowed indicator is invalid. Condition 4 is that the charging wake-up signal is valid.

[0041] In 11), the charging permission condition after the start of timing is condition five, which includes:

[0042] No high-voltage interlock fault;

[0043] The charging stop signal is invalid.

[0044] The power battery voltage is within the allowable operating range;

[0045] When the main charging positive relay and the main charging negative relay are closed, the battery requests heating, or the battery is in a heating or heat preservation state.

[0046] Battery wake-up signal is valid;

[0047] The charging not allowed flag is invalid.

[0048] To achieve the same inventive objective as the above-described technical solutions, the present invention also provides an electric vehicle charging control system; the control system employs the electric vehicle charging control method described above.

[0049] Similarly, the present invention also provides a vehicle; the vehicle employs the electric vehicle charging control system described above.

[0050] This invention employs the above-mentioned technical solution to solve the problem of battery depletion caused by repeated wake-ups of the vehicle network after charging is completed, preventing the vehicle from entering sleep mode when charging is insufficient, thus improving the user experience. Furthermore, when the vehicle experiences frequent and intermittent malfunctions during charging, the charging process is terminated to prevent these malfunctions from affecting vehicle safety. Charging resumes after the vehicle recovers, further enhancing vehicle safety. Attached Figure Description

[0051] Figure 1 This is a flowchart of the charging process of the present invention;

[0052] Figure 2 yes Figure 1 A magnified view of the upper middle section;

[0053] Figure 3 yes Figure 1 A magnified schematic diagram of the central part;

[0054] Figure 4 yes Figure 1 A magnified schematic diagram of the lower middle section. Detailed Implementation

[0055] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0056] Currently, most electric vehicle users schedule charging for their vehicles during off-peak hours using household 220V AC power to save on electricity costs. In analyzing the technical solution of this invention, we first analyze the problems existing in the prior art:

[0057] In existing technologies, after the charging gun is plugged into the vehicle or a home charger, the vehicle networking system (T-BOX) will wake up the on-board charger (OBC), battery management system (BMS), and vehicle controller (VCU) when the scheduled time is reached. After the vehicle controller (VCU) detects that there are no serious faults in the vehicle status, it sends a charging permission signal to the on-board charger (OBC) and battery management system (BMS), and the vehicle enters the charging process. The charging process continues until the vehicle is fully charged or reaches the preset charging capacity. Then, the on-board charger (OBC) and battery management system (BMS) turn off the wake-up source, and the charging ends.

[0058] The defects of the aforementioned existing technology are:

[0059] If a vehicle malfunctions during charging, the vehicle controller (VCU) will send a charging disallow signal. Upon receiving the charging disallow signal from the vehicle controller (VCU), the on-board charger (OBC) and battery management system (BMS) will disable the wake-up signal, and the vehicle controller (VCU) will enter sleep mode.

[0060] At this point, the on-board charger (OBC) detects that the vehicle controller (VCU) charging enable signal is at its initial value rather than charging disable. The OBC then wakes up the VCU again. The VCU detects a vehicle fault and disallows charging. The OBC and battery management system (BMS) then disable the wake-up source again, and the VCU enters sleep mode once more. This repeated wake-up-sleep cycle in the charging process depletes the vehicle's battery, ultimately leading to a depleted battery.

[0061] To address the problems and shortcomings of existing technologies and achieve the goal of keeping the vehicle network shut down after a charging failure and subsequent charging stop, thus preventing the vehicle network from being repeatedly woken up, this invention adopts an inventive technical solution:

[0062] like Figure 1 The charging process flowchart illustrates the technical solution of this invention, which is a charging control method for electric vehicles. Because... Figure 1 The graphics and fonts in the text are too small to convey the meaning clearly, so we use... Figures 2 to 4 They are respectively Figure 1 The diagrams show enlarged portions of the upper, middle, and lower sections to make the meaning clearer.

[0063] The electric vehicle includes a vehicle controller (VCU), an on-board charger (OBC), a battery management system (BMS), and a motor. The key concept of this invention is to enable the charging function of the entire vehicle through information interaction among the VCU, BMS, and OBC modules. If a fault occurs during the charging process or the charging conditions are not met, the charging process is stopped and the vehicle enters a dormant state. When the vehicle's charging conditions are met, the charging process cannot be restarted automatically; the charging gun needs to be re-plugged and the charging conditions need to be checked again before the charging process can resume.

[0064] Specifically, such as Figure 1 As shown, the control method includes the following steps:

[0065] start;

[0066] 1) Insert the charging gun;

[0067] 2) The on-board charger (OBC) and battery management system (BMS) detect whether the vehicle control unit (VCU) sends a charging permission signal; if yes, proceed to the next step; if no, proceed to step 16).

[0068] 3) The on-board charger (OBC) and battery management system (BMS) send a charging wake-up signal to the vehicle control unit (VCU);

[0069] 4) After receiving the charging wake-up signal, the vehicle control unit (VCU) checks and determines whether the battery management system (BMS) self-test is complete and fault-free, and whether the motor self-test is complete and fault-free; if yes, proceed to the next step; if no, proceed to 7).

[0070] 5) The vehicle control unit (VCU) sends a high-voltage charging command to the on-board charger (OBC) and battery management system (BMS);

[0071] 6) After receiving the high voltage charging command, the Battery Management System (BMS) controls the operation of the pre-charge relay, the main charging positive relay, and the main charging negative relay.

[0072] 7) The vehicle control unit (VCU) sequentially checks whether each charging permission condition before timing is met: if any charging permission condition is not met, proceed to step 15); if all charging permission conditions are met, proceed to the next step.

[0073] 8) Start the timer;

[0074] 9) The vehicle control unit (VCU) sends a charging allow initial value command;

[0075] 10) Determine if the timer counts for more than 1 second; if yes, proceed to the next step; if no, return to step 7).

[0076] 11) Vehicle Controller (VCU) determines whether all charging permission conditions are met after the start of timing; if yes, proceed to the next step; if no, issue a charging disallowed flag position signal, and then proceed to 15).

[0077] 12) The vehicle control unit (VCU) sends a charging permission command;

[0078] 13) The on-board charger (OBC) interacts with the battery management system (BMS) and the charging pile to enter the charging process;

[0079] 14) Charging complete; then proceed to 16).

[0080] 15) The vehicle control unit (VCU) sends a charging disallow command; then proceeds to the next step;

[0081] 16) The on-board charger (OBC) or battery management system (BMS) disables the charging wake-up signal;

[0082] 17) The vehicle control unit (VCU) enters sleep mode;

[0083] 18) Electric vehicles have entered a dormant state;

[0084] Finish.

[0085] To address the shortcomings of existing technologies, this invention proposes an electric vehicle charging control method, control system, and vehicle. It optimizes the existing charging logic during vehicle charging and prevents repeated wake-ups of the vehicle network when a vehicle malfunctions during charging, thereby avoiding battery depletion and ensuring vehicle safety.

[0086] In step 7), the charging permission conditions are determined in the following order: Condition 1, Condition 2, Condition 3, and Condition 4. Condition 1 is that the charging gun is connected. Condition 2 is that the vehicle has no serious malfunctions and the handbrake is engaged. Condition 3 is that the charging disallowed indicator is invalid. Condition 4 is that the charging wake-up signal is valid.

[0087] In 11), the charging permission condition after the start of timing is condition five, which includes:

[0088] No high-voltage interlock fault;

[0089] The charging stop signal is invalid.

[0090] The power battery voltage is within the allowable operating range;

[0091] When the main charging positive relay and the main charging negative relay are closed, the battery requests heating, or the battery is in a heating or heat preservation state.

[0092] Battery wake-up signal is valid;

[0093] The charging not allowed flag is invalid.

[0094] A detailed analysis of the working principle of the electric vehicle charging control method of the present invention:

[0095] 1. The vehicle control unit (VCU) detects the charging conditions. The VCU first detects the charging wake-up signal. When the VCU receives the charging wake-up signal from the on-board charger (OBC), the VCU detects the vehicle status.

[0096] a. High-voltage battery voltage detection: Check whether the high-voltage battery voltage is within the allowable range to prevent overcharging. Charging is not allowed when the high-voltage battery voltage exceeds the threshold.

[0097] b. Vehicle fault detection: When a vehicle has a serious fault, it is not allowed to charge.

[0098] c. Detect the connection status of the charging gun. Charging is not allowed when the vehicle is not in a connected state.

[0099] d. Handbrake status: During charging, to prevent the vehicle from rolling and causing a charging accident, the handbrake status needs to be checked. Charging is not allowed if the handbrake is not engaged.

[0100] e. High-voltage interlock status: When the vehicle is slow charging, the high-voltage interlock status of each circuit is detected. If a high-voltage interlock fault exists, charging is not allowed.

[0101] 2. Charging process control:

[0102] During the charging process, when the vehicle controller (VCU) is woken up, it first checks whether there is a serious fault in the vehicle, whether the handbrake is engaged, and whether the charging gun is connected. If any of these conditions are not met, the vehicle controller (VCU) sends a chargeDisallow command to prevent the vehicle from charging, the charging process stops, the wake-up source is turned off, and the vehicle enters a sleep state.

[0103] If all three conditions above are met, proceed to the next conditional judgment to determine whether a charging wake-up signal has been received.

[0104] If no charging wake-up signal is received, the vehicle controller (VCU) sends the initial charging permission value Initial, and the vehicle does not enter the charging process and continues to wait;

[0105] After waiting for a period of time, if the vehicle control unit (VCU) does not send a charging permission command, the vehicle will turn off the charging wake-up source and enter a sleep state.

[0106] If the vehicle receives a charging wake-up signal, the vehicle controller (VCU) will make the next condition judgment, such as the high-voltage battery voltage, the closed status of the main charging positive relay and the main charging negative relay, the high-voltage interlock status, and the stop charging status sent by the in-vehicle infotainment system host (IHU).

[0107] When these conditions are met simultaneously and a charging wake-up source exists, the vehicle control unit (VCU) sends a charging allow command (ChargeAllow), and the vehicle enters the charging process.

[0108] If charging is interrupted due to factors such as high voltage battery overvoltage, high voltage interlock, or charging stoppage of the in-vehicle infotainment system (IHU), the vehicle controller (VCU) will still not allow the vehicle to charge after the fault is resolved.

[0109] This signifies the end of a charging process. Recharging again requires restarting the process, including unplugging and replugging the charging gun. This effectively prevents repeated wake-ups during charging, which could lead to the vehicle failing to enter sleep mode and causing the battery to drain.

[0110] To achieve the same inventive objective as the above-described technical solutions, the present invention also provides an electric vehicle charging control system; the control system employs the electric vehicle charging control method described above.

[0111] Similarly, the present invention also provides a vehicle; the vehicle employs the electric vehicle charging control system described above.

[0112] The beneficial effects achieved by the present invention using the above technical solution are:

[0113] 1. User Experience: The system has resolved the issue of battery depletion caused by repeated wake-ups of the vehicle network after charging is complete, preventing the vehicle from going into sleep mode, when charging is insufficient. This has improved the user experience.

[0114] 2. Enhanced safety: If the vehicle experiences frequent and intermittent malfunctions during charging, the charging process will be terminated to prevent the vehicle from resuming charging after the malfunction is resolved, which could affect vehicle safety.

[0115] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A charging control method for an electric vehicle, wherein the electric vehicle includes a vehicle controller (VCU), an on-board charger (OBC), a battery management system (BMS), and a motor; Its features are, The control method includes the following steps: start; 1) Insert the charging gun; 2) The on-board charger (OBC) and battery management system (BMS) detect whether the vehicle control unit (VCU) sends a charging permission signal; if yes, proceed to the next step; if no, proceed to step 16). 3) The on-board charger (OBC) and battery management system (BMS) send a charging wake-up signal to the vehicle control unit (VCU); 4) After receiving the charging wake-up signal, the vehicle control unit (VCU) checks and determines whether the battery management system (BMS) self-test is complete and fault-free, and whether the motor self-test is complete and fault-free; if yes, proceed to the next step; if no, proceed to 7). 5) The vehicle control unit (VCU) sends a high-voltage charging command to the on-board charger (OBC) and battery management system (BMS); 6) After receiving the high voltage charging command, the Battery Management System (BMS) controls the operation of the pre-charge relay, the main charging positive relay, and the main charging negative relay. 7) The vehicle control unit (VCU) sequentially checks whether each charging permission condition before timing is met: if any charging permission condition is not met, proceed to step 15); if all charging permission conditions are met, proceed to the next step. 8) Start the timer; 9) The vehicle control unit (VCU) sends a charging allow initial value command; 10) Determine if the timer counts for more than 1 second; if yes, proceed to the next step; if no, return to step 7). 11) Vehicle Controller (VCU) determines whether all charging permission conditions are met after the start of timing; if yes, proceed to the next step; if no, issue a charging disallowed flag position signal, and then proceed to 15). 12) The vehicle control unit (VCU) sends a charging permission command; 13) The on-board charger (OBC) interacts with the battery management system (BMS) and the charging pile to enter the charging process; 14) Charging complete; then proceed to 16). 15) The vehicle control unit (VCU) sends a charging disallow command; then proceeds to the next step; 16) The on-board charger (OBC) or battery management system (BMS) disables the charging wake-up signal; 17) The vehicle control unit (VCU) enters sleep mode; 18) Electric vehicles have entered a dormant state; Finish.

2. The electric vehicle charging control method according to claim 1, characterized in that: In 7), the charging permission conditions are, in order of judgment, condition one, condition two, condition three and condition four.

3. The electric vehicle charging control method according to claim 2, characterized in that: The first condition is that the charging gun is already connected.

4. The electric vehicle charging control method according to claim 2, characterized in that: The second condition is that the vehicle has no serious malfunctions and the handbrake is engaged.

5. The electric vehicle charging control method according to claim 2, characterized in that: The third condition, indicating that charging is not allowed, is invalid.

6. The electric vehicle charging control method according to claim 2, characterized in that: Condition four is that the charging wake-up signal is valid.

7. The electric vehicle charging control method according to claim 1, characterized in that: In 11), the charging permission condition after the start of timing is condition five, which includes: No high-voltage interlock fault; The charging stop signal is invalid. The power battery voltage is within the allowable operating range; When the main charging positive relay and the main charging negative relay are closed, the battery requests heating, or the battery is in a heating or heat preservation state. Battery wake-up signal is valid; The charging not allowed flag is invalid.

8. An electric vehicle charging control system, characterized in that: The control system adopts the electric vehicle charging control method according to any one of claims 1 to 7.

9. A vehicle, characterized in that: The vehicle described herein employs the electric vehicle charging control system as described in claim 8.

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