Electric vehicle charging control method and system, and computer-readable storage medium

Abstract

An electric vehicle charging control method and system, and a computer-readable storage medium. The method comprises the following steps: when charging gun insertion is in an inserted state, determining whether a handbrake is pulled up; if so, allowing a charging state to be entered; and if not, on the basis of a vehicle speed, determining whether to allow charging, involving: when the vehicle speed is 0 and the duration is greater than a first time threshold t1, allowing the charging state to be entered.

Description

Electric vehicle charging control method, system and computer-readable storage medium Technical Field

[0001] The present invention belongs to the technical field of electric vehicles, and in particular relates to an electric vehicle charging control method, system and computer-readable storage medium. Background Art

[0002] Charging is a crucial function and scenario for electric vehicles, making efficient, convenient, and safe charging methods particularly crucial. Currently, for charging safety reasons, it's generally accepted that charging must be tied to the parking brake. Charging is permitted when the parking brake is engaged, but charging is prohibited when the parking brake is engaged. This prevents unforeseen accidents caused by vehicle movement during charging. While this approach addresses charging safety concerns to a certain extent, many users forget to engage the parking brake after using the vehicle, resulting in a charging failure. This significantly impacts the user's charging experience and creates travel inconvenience. Summary of the Invention

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and provide an electric vehicle charging control method.

[0004] The present invention is achieved through the following technical solutions:

[0005] A method for controlling charging of an electric vehicle comprises the following steps:

[0006] When the gun is in the inserted state, determine whether the parking brake is pulled; if so, allow to enter the charging state;

[0007] If not, determine whether charging is allowed based on vehicle speed:

[0008] When the vehicle speed is 0 and the duration is greater than the first time threshold t1, entering the charging state is allowed.

[0009] Furthermore, in the charging state, if one of the following exit conditions is met, the charging state is exited:

[0010] 1) 0 < vehicle speed < vehicle speed threshold a, and the duration is greater than the second time threshold t2;

[0011] 2) Vehicle speed ≥ vehicle speed threshold a.

[0012] Furthermore, in the charging state, and when one of the exit conditions is met, if the motor speed is greater than 0, a vehicle slipping warning is issued when exiting the charging state.

[0013] Furthermore, the vehicle speed threshold a and the second time threshold t2 are calibrated according to the vehicle speed and the duration of action when the charging device is damaged during the charging process.

[0014] Furthermore, in the set charging scenario, if the vehicle speed V n Duration of action t n If the charging equipment is damaged, the vehicle speed V n and duration of action t n To calibrate the vehicle speed threshold a and the second time threshold t2: vehicle speed threshold a ≤ vehicle speed V n , and the second time threshold t2≤action duration t n .

[0015] Furthermore, the value ranges of the vehicle speed threshold a and the second time threshold t2 are as follows: 0.9V n ≤a≤V n , 0.9t n ≤t2≤t n .

[0016] Furthermore, the value range of the first time threshold t1 is 5 to 10 message cycles for sending the vehicle speed.

[0017] The present invention also provides an electric vehicle charging control system, comprising a VCU vehicle controller and a vehicle speed sensor; the vehicle speed sensor is used to collect the vehicle speed and send it to the VCU vehicle controller; the VCU vehicle controller is used to obtain the handbrake status and the gun insertion status, and execute the electric vehicle charging control method described in any one of claims 1 to 7.

[0018] Furthermore, the VCU vehicle controller obtains the parking brake status through a hard line or a CAN bus; the VCU vehicle controller obtains the gun insertion status through a gun insertion status detection circuit.

[0019] The present invention also provides a computer-readable storage medium, which stores at least one computer-executable program. When the at least one program is executed by the computer, the computer executes the steps in the electric vehicle charging control method described in the present invention.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention breaks the prejudice that electric vehicles must be charged under the premise of pulling the handbrake. By introducing the vehicle speed judgment condition, the present invention ensures the safety of charging under the premise of not pulling the handbrake, avoids the situation of not charging due to forgetting to pull the handbrake, and improves the user experience.

[0022] 2. When the vehicle speed is greater than 0, the charging state is not directly exited. Instead, the system further judges the situation based on the vehicle speed threshold a, avoiding the exit from the charging state due to transient fluctuations in the vehicle speed. This not only ensures charging safety, but also improves the charging success rate and enhances the user experience.

[0023] 3. During the charging process, the vehicle speed and motor speed are monitored in real time, and the vehicle slipping phenomenon is detected in time through the vehicle speed fluctuation, so that charging can be stopped in time and the power supply can be cut off to avoid leakage due to damage to the charging equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a flow chart of charging control in the prior art;

[0025] FIG2 is a flow chart of charging control in this specific embodiment;

[0026] Figure 3 is a schematic diagram of charging in charging scenario 1;

[0027] Figure 4 is a schematic diagram of charging under charging scenario 2;

[0028] FIG5 is a schematic diagram of charging under charging scenario 3. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings.

[0030] Currently, for charging safety reasons, it is generally believed that charging must be tied to the parking brake. That is, the vehicle can enter charging mode when the parking brake is applied, but charging is prohibited when the parking brake is not applied. This prevents unexpected accidents caused by vehicle movement during charging. The control flow of the existing technology is shown in Figure 1. While this method solves the charging safety issue to a certain extent, many users forget to apply the parking brake after using the vehicle, resulting in charging failure. This significantly affects the user's charging experience and causes travel inconvenience.

[0031] Referring to FIG2 , the present invention provides a method for controlling charging of an electric vehicle, comprising the following steps:

[0032] When the gun is in the inserted state, determine whether the parking brake is pulled; if so, allow to enter the charging state;

[0033] If not, determine whether charging is allowed based on vehicle speed:

[0034] When the vehicle speed is 0 and the duration is greater than the first time threshold t1, entering the charging state is allowed.

[0035] The charging state refers to the state where the plug gun is inserted and the charging circuit is connected.

[0036] Preferably, the value range of the first time threshold t1 is 5 to 10 message cycles. In this way, under the premise that the vehicle speed is 0, the first time threshold t1 is added to limit the charging conditions, which not only avoids misjudgment caused by unstable signals, but also improves safety.

[0037] Preferably, in the charging state, if one of the following exit conditions is met, the charging state is exited:

[0038] 1) 0 < vehicle speed < vehicle speed threshold a, and the duration is greater than the second time threshold t2;

[0039] 2) Vehicle speed ≥ vehicle speed threshold a.

[0040] Exiting the charging state refers to a state where the charging circuit is disconnected.

[0041] In this way, in the present invention, when the vehicle speed is greater than 0, the charging state is not directly exited, but further judged according to the vehicle speed threshold a, thereby avoiding the exit from the charging state due to transient fluctuations in the vehicle speed, thereby ensuring charging safety, improving the charging success rate, and enhancing the user experience.

[0042] During the charging process, the vehicle speed is monitored in real time, and the slipping phenomenon is detected in time through the speed fluctuation, so that charging can be stopped in time and the power supply can be cut off to avoid leakage due to damage to the charging equipment.

[0043] In order to further enhance the user experience, by adding the motor speed criterion, it is possible to more accurately determine whether the vehicle has actually moved, avoid misjudgment, and thus improve the accuracy of the vehicle slip warning.

[0044] Specifically, when one of the exit conditions is met, if the motor speed is greater than 0, a vehicle slip warning is issued when exiting the charging state. If one of the exit conditions is met and the motor speed is 0, only the charging state is exited without issuing a vehicle slip warning.

[0045] It should be noted that this specific embodiment does not distinguish between the vehicle speed direction and the motor speed direction, so the vehicle speed is not 0, that is, the vehicle speed is greater than 0, and the motor speed is not greater than 0, that is, the motor speed is 0.

[0046] This specific embodiment also provides a computer-readable storage medium, which stores at least one computer-executable program. When the at least one program is executed by the computer, the computer executes the steps of the electric vehicle charging control method described in the present invention.

[0047] In order to implement the charging control method of the present invention, a corresponding electric vehicle charging control system is provided, including a VCU (Vehicle Control Unit) and a vehicle speed sensor; the VCU vehicle controller is used to obtain the parking brake status and the gun insertion status; the VCU vehicle controller is used to execute the electric vehicle charging control method of the present invention.

[0048] When the handbrake is a mechanical handbrake, the VCU vehicle controller obtains the handbrake status through a hard line. When the handbrake is an electronic handbrake, the VCU vehicle controller obtains the handbrake status through a CAN (Controller Area Network) bus.

[0049] The VCU vehicle controller obtains the gun plug status through the gun plug status detection circuit. The gun plug status detection circuit can adopt any existing technology that can realize the gun plug status detection, such as the gun plug status detection circuit disclosed in the Chinese patent (CN116359799A) a gun plug status detection circuit, a detection module, an on-board charger and a charging pile.

[0050] The VCU vehicle controller controls the charging switch to connect or disconnect the charging circuit, allowing the vehicle to enter or exit the charging state. The VCU vehicle controller issues a vehicle slipping warning through the alarm module. The alarm module can be an audible and visual alarm module or a text message sending module. The text message sending module is used to send the vehicle slipping warning information to the owner's mobile phone, tablet and other mobile terminals.

[0051] The following is further described in detail with reference to the embodiments.

[0052] Example 1

[0053] This embodiment is described with respect to charging scenario 1. Referring to FIG3 , in charging scenario 1, the vehicle is parked in a parking space with a relatively small slope. When the handbrake is pulled, the vehicle is allowed to enter the charging state. If the handbrake is not pulled, the vehicle may not necessarily roll.

[0054] In charging scenario 1, when the plug is in the plugged-in state, if the condition that "the vehicle speed is 0 and the duration is greater than the first time threshold t1" that allows entering the charging state without pulling the handbrake is met, then entering the charging state is allowed.

[0055] After entering the charging state, if the vehicle slips, the vehicle speed will inevitably be greater than 0. Then, the charging state will be exited when any of the following conditions are met:

[0056] 1) 0<vehicle speed ≤ vehicle speed threshold a, and the duration is greater than the second time threshold t2;

[0057] 2) Vehicle speed ≥ vehicle speed threshold a.

[0058] In charging scenario 1, the vehicle speed threshold a and the second time threshold t2 are calibrated as follows:

[0059] The vehicle speed threshold a and the second time threshold t2 are calibrated by observing the phenomenon of damage to the charging equipment (such as the breakage of the charging gun's wiring harness) during the charging process, as follows:

[0060] In the set charging scenario 1, if the vehicle speed V n Duration of action t n If the charging equipment is damaged, the vehicle speed V n and duration of action t n To calibrate the speed threshold a and time threshold t2, that is: speed threshold a ≤ speed V n , and the second time threshold t2≤action duration t n .

[0061] Preferably, the vehicle speed V n After the reduction, it is used as the vehicle speed threshold a, and the duration of action t n After reduction, it is used as the time threshold t2.

[0062] You can also only set the vehicle speed V n Reduce, as the vehicle speed threshold a, and use the action time t n As the second time threshold t2. It is also possible to only set the action time t n Decrease, as the second time threshold t2, and use the vehicle speed V n As the vehicle speed threshold a.

[0063] During the duration of action t n The specific speed reduction range is further determined by the speed test: set a unit speed range, and reduce the speed range by one unit each time for testing until stable charging is achieved. Stable charging means that the battery status is displayed as charging. According to the speed test, the duration of continuous action t n Under this condition, the vehicle speed v that can ensure stable charging s , the vehicle speed v s As the vehicle speed threshold a, and the duration of action t n As the second time threshold t2.

[0064] At vehicle speed V n The specific duration of the reduction is further determined by the duration test: set a unit duration amplitude, and reduce the unit duration amplitude each time for testing until stable charging is achieved. Stable charging means that the battery status is displayed as charging. According to the duration test, the vehicle speed V n Under this condition, it can ensure the stable charging time t s , the vehicle speed V n As the vehicle speed threshold a, and the duration of action t s As the second time threshold t2.

[0065] In order to further improve the safety and reliability of charging, the vehicle speed v obtained by the vehicle speed test can also be used to calculate the vehicle speed v. s As the speed threshold a, the action duration t obtained by the duration test is sAs the second time threshold t2.

[0066] According to the vehicle speed test and the time test, the value ranges of the vehicle speed threshold a and the second time threshold t2 provided in this embodiment are as follows: 0.9V n ≤a≤V n , 0.9t n ≤t2≤t n In this range, the allowed speed fluctuation range is wider and the allowed action time is longer, which can not only ensure the charging safety and reliability, but also improve the charging success rate; on the contrary, for example, taking 0.1V n As the vehicle speed threshold a, although it can ensure charging safety and reliability, charging will be terminated if there is a slight speed fluctuation, and the charging success rate is low.

[0067] In this embodiment, 0.9V n As the vehicle speed threshold a, 0.95t n As the second time threshold t2.

[0068] This embodiment meets the need to charge the battery when the handbrake is forgotten in charging scenario 1, while taking safety into consideration: when the charging conditions are not met, the charging state can be exited in time, avoiding the risk of electric shock caused by the power not being cut off after the charging equipment is damaged.

[0069] Example 2

[0070] The only difference between this embodiment and embodiment 1 is that: in the charging state, when one of the exit conditions is met, if the motor speed is greater than 0, a vehicle slip warning is issued when exiting charging.

[0071] The specific judgment process is as follows:

[0072] When "0 < vehicle speed < vehicle speed threshold a, duration greater than second time threshold t2" or "vehicle speed ≥ vehicle speed threshold a" is satisfied; then determine whether the motor speed is greater than 0;

[0073] If the motor speed is equal to 0, the charging state is simply exited without issuing a vehicle slip warning.

[0074] If the motor speed is greater than 0, a slip warning will be issued when exiting the charging state.

[0075] This embodiment can more accurately determine whether the vehicle has actually moved by adding the motor speed criterion, avoiding misjudgment, thereby improving the accuracy of the vehicle slip warning and further enhancing the user experience.

[0076] Example 3

[0077] This embodiment is described for Charging Scenario 2. Referring to Figure 4 , in Charging Scenario 2, the vehicle is parked in a relatively flat parking space. Charging is permitted when the parking brake is engaged. Even if the parking brake is not engaged, the vehicle generally will not roll away, and the vehicle speed must be zero. Therefore, the "vehicle speed is zero and the duration is greater than the first time threshold t1" condition is met, and Charging is permitted.

[0078] This example achieves charging completion in charging scenario 2 without pulling the handbrake, avoiding the situation where charging is not completed due to forgetting to pull the handbrake, and improving the user experience.

[0079] Of course, if an unexpected situation occurs and the vehicle speed is not 0, the charging state will be exited. The details are as follows:

[0080] When "0 < vehicle speed < vehicle speed threshold a, duration greater than second time threshold t2" or "vehicle speed ≥ vehicle speed threshold a" is satisfied; then determine whether the motor speed is greater than 0;

[0081] If the motor speed is equal to 0, the charging state is simply exited without issuing a vehicle slip warning.

[0082] If the motor speed is greater than 0, a slip warning will be issued when exiting the charging state.

[0083] The calibration method of the vehicle speed threshold a and the second time threshold t2 adopted in this embodiment is the same as that in the first embodiment.

[0084] Example 4

[0085] This embodiment describes charging scenario 3. As shown in Figure 5 , in charging scenario 3, a vehicle is parked on a steep slope. While charging is permitted when the parking brake is engaged, the vehicle cannot stop without the handbrake engaged, inevitably causing the vehicle to roll away, and the vehicle speed must remain above zero. Therefore, the "vehicle speed remains zero for a duration greater than the first time threshold t1" condition, which allows charging without the handbrake engaged, is not met.

[0086] This embodiment prohibits charging in charging scenario 3 when the handbrake is not pulled, thereby ensuring safety.

[0087] In addition, if an unexpected situation occurs after the parking brake is applied and the vehicle enters the charging state and the vehicle speed does not reach 0, the charging will be terminated. The details are as follows:

[0088] When "0 < vehicle speed < vehicle speed threshold a, duration greater than second time threshold t2" or "vehicle speed ≥ vehicle speed threshold a" is satisfied; then determine whether the motor speed is greater than 0;

[0089] If the motor speed is equal to 0, the charging is simply exited without issuing a vehicle slip warning.

[0090] If the motor speed is greater than 0, a vehicle slip warning will be issued when exiting charging.

[0091] The above technical solutions are only specific implementation methods of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and are not limited to the technical solutions described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A method for controlling charging of an electric vehicle, characterized in that: The steps include: When the gun is in the inserted state, it is determined whether the parking brake is pulled. If so, it is allowed to enter the charging state; If not, determine whether charging is allowed based on vehicle speed: When the vehicle speed is 0 and the duration is greater than the first time threshold t1, entering the charging state is allowed.

2. The electric vehicle charging control method according to claim 1, characterized in that: In the charging state, if one of the following exit conditions is met, the charging state is exited: 1) 0 < vehicle speed < vehicle speed threshold a, and the duration is greater than the second time threshold t2; 2) Vehicle speed ≥ vehicle speed threshold a.

3. The electric vehicle charging control method according to claim 1, wherein: In the charging state, and when one of the exit conditions is met, if the motor speed is greater than 0, a vehicle slipping warning is issued when exiting the charging state.

4. The electric vehicle charging control method according to claim 3, characterized in that: The vehicle speed threshold a and the second time threshold t2 are calibrated according to the vehicle speed and the duration of action when the charging device is damaged during the charging process.

5. The electric vehicle charging control method according to claim 4, characterized in that: In the set charging scenario, if the vehicle speed V n Duration of action t n If the charging equipment is damaged, the vehicle speed V n and duration of action t n To calibrate the vehicle speed threshold a and the second time threshold t2: vehicle speed threshold a ≤ vehicle speed V n , and the second time threshold t2≤action duration t n .

6. The electric vehicle charging control method according to claim 5, characterized in that: The value ranges of the vehicle speed threshold a and the second time threshold t2 are as follows: 0.9V n ≤a≤V n , 0.9t n ≤t2≤t n .

7. The electric vehicle charging control method according to claim 1, characterized in that: The first time threshold t1 has a value range of 5 to 10 periods of the vehicle speed message being sent.

8. An electric vehicle charging control system, characterized in that: It includes a VCU vehicle controller and a vehicle speed sensor; the vehicle speed sensor is used to collect the vehicle speed and send it to the VCU vehicle controller; the VCU vehicle controller is used to obtain the handbrake status and the gun insertion status, and execute the electric vehicle charging control method described in any one of claims 1 to 7.

9. The electric vehicle charging control system according to claim 8, characterized in that: The VCU vehicle controller obtains the parking brake status through a hard line or a CAN bus; the VCU vehicle controller obtains the gun insertion status through a gun insertion status detection circuit.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores at least one computer-executable program, and when the at least one program is executed by the computer, the computer executes the steps of the electric vehicle charging control method according to any one of claims 1 to 7.

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