Method and device for processing abnormal charging voltage of vehicle

Abstract

The present invention discloses a method and device for handling abnormal charging voltage of a vehicle. The method includes: after the vehicle enters a ready-to-charge state, controlling the vehicle's AC voltage control switch to a closed state to enable the vehicle to enter a battery charging state, detecting in real time whether the AC voltage meets a preset AC voltage threshold condition; when the AC voltage does not meet the preset AC voltage threshold condition, controlling the vehicle to enter a suspended charging state, and detecting the cumulative number of times the AC voltage does not meet the preset AC voltage threshold condition in the current charging cycle; when it is determined that the cumulative number of times the AC voltage does not meet the preset AC voltage threshold condition is greater than a preset number, controlling the vehicle to exit the current charging cycle. The embodiment of the present invention can effectively avoid the situation where frequent voltage abnormalities during vehicle charging cause vehicle component damage, effectively improving the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle charging, and in particular to a method and device for processing abnormal charging voltage of a vehicle. Background Art

[0002] The AC charging process of electric vehicles is often characterized by long charging times and unattended operation. The grid voltage is affected by factors such as local area loads, and sometimes the voltage is prone to fluctuations. This will cause the on-board charger input voltage to be too low or too high and unable to operate. Therefore, corresponding fault handling needs to be set up to resolve the problem of abnormal vehicle charging input voltage.

[0003] Existing fault handling methods for vehicle charging anomalies typically suspend charging when the input voltage is detected to be too low or too high, and resume charging when the input voltage returns to normal. However, the inventors have discovered that existing solutions suffer from at least the following issues: frequent voltage anomalies can cause the charging system and components to repeatedly restart, shortening component lifespans or even causing component failure, thus degrading the user experience. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a method and device for handling abnormal charging voltage of a vehicle, which can effectively avoid the situation where frequent abnormal voltage failures during vehicle charging cause damage to vehicle components, and effectively improve the user's car experience.

[0005] To achieve the above objectives, an embodiment of the present invention provides a method for processing abnormal charging voltage of a vehicle, comprising:

[0006] After the vehicle enters a ready-to-charge state, controlling the AC voltage control switch of the vehicle to be in a closed state, so that the vehicle enters a battery charging state;

[0007] Real-time detection of whether the AC voltage meets the preset AC voltage threshold condition;

[0008] When the AC voltage does not meet a preset AC voltage threshold condition, controlling the vehicle to be in a charging pause state;

[0009] After controlling the vehicle to be in a charging pause state, detecting a cumulative number of times that the AC voltage fails to meet a preset AC voltage threshold condition in a current charging round;

[0010] When it is determined that the AC voltage does not meet the preset AC voltage threshold condition for a cumulative number of times greater than a preset number, the vehicle is controlled to exit the current charging round.

[0011] As an improvement to the above solution, when the AC voltage does not meet a preset AC voltage threshold condition, controlling the vehicle to be in a charging pause state specifically includes:

[0012] When the AC voltage is greater than a preset standard voltage upper limit, the vehicle is controlled to be in a charging pause state.

[0013] As an improvement to the above solution, after controlling the vehicle to be in a charging pause state when the AC voltage is greater than a preset standard voltage upper limit, the method further includes:

[0014] When the AC voltage is greater than a preset upper limit of the withstand voltage, the AC voltage control switch of the vehicle is controlled to be in an off state; wherein the upper limit of the withstand voltage is greater than the upper limit of the standard voltage.

[0015] As an improvement to the above solution, the detecting of the cumulative number of times that the AC voltage does not meet the preset AC voltage threshold condition in the current charging round specifically includes:

[0016] Detecting the cumulative number of times, in the current charging cycle, the AC voltage is greater than the preset standard voltage upper limit and less than or equal to the preset withstand voltage upper limit;

[0017] Then, when it is determined that the AC voltage does not meet the preset AC voltage threshold condition for a cumulative number of times greater than a preset number, the vehicle is controlled to exit the current charging round, specifically:

[0018] When the AC voltage is greater than the preset standard voltage upper limit, and the cumulative number of times that the AC voltage is less than or equal to the preset withstand voltage upper limit is greater than a first preset number, the vehicle is controlled to exit the current charging round.

[0019] As an improvement to the above solution, after controlling the vehicle to be in a suspended charging state and before detecting the cumulative number of times the AC voltage fails to meet a preset AC voltage threshold condition in a current charging round, the method further includes:

[0020] Detecting a duration in which the AC voltage is greater than the preset upper limit of the standard voltage and less than or equal to the preset upper limit of the withstand voltage;

[0021] When the AC voltage is greater than the preset standard voltage upper limit and the duration of being less than or equal to the preset tolerance voltage upper limit is greater than a first preset time length, controlling the vehicle to exit the current charging round;

[0022] When the AC voltage is greater than the preset standard voltage upper limit, and the duration of being less than or equal to the preset tolerance voltage upper limit is less than or equal to the first preset time duration, executing: detecting the cumulative number of times the AC voltage does not meet the preset AC voltage threshold condition in the current charging round.

[0023] As an improvement to the above solution, the detecting of the cumulative number of times that the AC voltage does not meet the preset AC voltage threshold condition in the current charging round specifically includes:

[0024] Detecting the cumulative number of times the AC voltage is greater than the preset upper limit of the withstand voltage in the current charging cycle;

[0025] Then, when it is determined that the AC voltage does not meet the preset AC voltage threshold condition for a cumulative number of times greater than a preset number, the vehicle is controlled to exit the current charging round, specifically:

[0026] When the AC voltage is greater than the preset withstand voltage threshold for a cumulative number of times greater than a second preset number of times, the vehicle is controlled to exit the current charging round.

[0027] As an improvement to the above solution, after detecting the cumulative number of times that the AC voltage is greater than the preset upper limit of the withstand voltage in the current charging round, the method further includes:

[0028] When the cumulative number of times that the AC voltage is greater than the preset tolerance voltage threshold is less than or equal to the second preset number, after a second preset time, the AC voltage control switch of the vehicle is controlled to be in a closed state to allow the vehicle to enter a battery charging state.

[0029] As an improvement to the above solution, when the AC voltage does not meet a preset AC voltage threshold condition, controlling the vehicle to be in a charging pause state specifically includes:

[0030] When the AC voltage is less than a preset standard voltage lower limit, the vehicle is controlled to be in a charging pause state.

[0031] As an improvement to the above solution, the detecting of the cumulative number of times that the AC voltage does not meet the preset AC voltage threshold condition in the current charging round specifically includes:

[0032] Detecting the cumulative number of times that the AC voltage is less than the preset standard voltage lower limit in the current charging cycle;

[0033] Then, when it is determined that the AC voltage does not meet the preset AC voltage threshold condition for a cumulative number of times greater than a preset number, the vehicle is controlled to exit the current charging round, specifically:

[0034] When the AC voltage is less than the preset standard voltage lower limit value for a cumulative number of times greater than a third preset number, the vehicle is controlled to exit the current charging round.

[0035] As an improvement to the above solution, after controlling the vehicle to be in a suspended charging state and before detecting the cumulative number of times the AC voltage fails to meet a preset AC voltage threshold condition in a current charging round, the method further includes:

[0036] Detecting a duration in which the AC voltage is less than the preset standard voltage lower limit;

[0037] When the AC voltage is less than the preset standard voltage lower limit for a duration greater than a third preset time period, controlling the vehicle to exit the current charging round;

[0038] When the duration that the AC voltage is less than the preset standard voltage lower limit is less than or equal to the third preset time length, executing: detecting the cumulative number of times that the AC voltage does not meet the preset AC voltage threshold condition in the current charging round.

[0039] As an improvement to the above solution, the method further includes:

[0040] When the AC voltage meets a preset AC voltage threshold condition, the vehicle is controlled to be in the battery charging state.

[0041] As an improvement to the above solution, after the vehicle enters the ready-to-charge state, before controlling the AC voltage control switch of the vehicle to be in a closed state to connect the AC voltage transmission circuit between the vehicle battery and the power supply system, the method further includes:

[0042] Determining whether the vehicle meets a preset battery charging condition;

[0043] When the vehicle meets the preset battery charging condition, the vehicle is controlled to enter the ready-to-charge state.

[0044] An embodiment of the present invention provides a device for processing abnormal charging voltage of a vehicle, comprising:

[0045] a switch control module, configured to control the AC voltage control switch of the vehicle to be in a closed state after the vehicle enters a ready-to-charge state, so as to enable the vehicle to enter a battery charging state;

[0046] A voltage threshold condition detection module is used to detect in real time whether the AC voltage meets the preset AC voltage threshold condition;

[0047] a first charging state control module, configured to control the vehicle to be in a suspended charging state when the AC voltage does not meet a preset AC voltage threshold condition;

[0048] a cumulative number calculation module, configured to detect, after controlling the vehicle to be in a suspended charging state, a cumulative number of times that the AC voltage fails to meet a preset AC voltage threshold condition in a current charging round;

[0049] The second charging state control module is configured to control the vehicle to exit the current charging round when the cumulative number of times that it is determined that the AC voltage does not meet the preset AC voltage threshold condition is greater than a preset number.

[0050] An embodiment of the present invention provides a device for processing abnormal charging voltage of a vehicle, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the method for processing abnormal charging voltage of a vehicle as described in any one of the above items.

[0051] Compared to the prior art, the method and device for handling abnormal charging voltage in a vehicle disclosed in the present invention controls the vehicle's AC voltage control switch to a closed state after the vehicle enters a ready-to-charge state, thereby enabling the vehicle to enter a battery charging state. The method and device detect in real time whether the AC voltage meets a preset AC voltage threshold condition. When the AC voltage does not meet the preset AC voltage threshold condition, the vehicle is controlled to enter a suspended charging state. The method and device also detect the cumulative number of times the AC voltage fails to meet the preset AC voltage threshold condition during the current charging cycle. When it is determined that the cumulative number of times the AC voltage fails to meet the preset AC voltage threshold condition exceeds a preset number, the vehicle is controlled to exit the current charging cycle. The technical measures of the embodiments of the present invention can effectively prevent the situation in which the charging system and components are repeatedly restarted due to frequent and repeated abnormal AC voltage conditions during vehicle battery charging, resulting in a reduction in the service life of charging components or failure of charging components. This effectively improves the safety and reliability of the vehicle battery charging process, reduces the risk of damage to charging system components, and effectively enhances the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic diagram of the steps of a method for handling abnormal charging voltage of a vehicle provided in the first embodiment of the present invention;

[0053] Figure 2 is a schematic diagram of the connection structure between a vehicle and a power supply device in an embodiment of the present invention;

[0054] Figure 3 This is a schematic diagram of the steps of a method for handling abnormal charging voltage of a vehicle provided in a second embodiment of the present invention;

[0055] Figure 4 This is a schematic diagram of the structure of a device for processing abnormal charging voltage of a vehicle provided by a third embodiment of the present invention;

[0056] Figure 5 It is a structural diagram of a device for processing abnormal charging voltage of a vehicle provided in a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0058] See also Figure 1 , is a schematic diagram of the steps of a method for handling abnormal charging voltage of a vehicle provided by the first embodiment of the present invention. The first embodiment of the present invention provides a method for handling abnormal charging voltage of a vehicle, which is applicable to electric vehicles and can be executed by a controller of an on-board charger, specifically comprising the following steps S1 to S5:

[0059] S1. After the vehicle enters a ready-to-charge state, the AC voltage control switch of the vehicle is controlled to be in a closed state, so that the vehicle enters a battery charging state.

[0060] Specifically, see Figure 2 , is a schematic diagram of the connection structure between the vehicle and the power supply equipment in an embodiment of the present invention. It should be noted that in this embodiment of the present invention, one battery charging cycle is defined as the removal and insertion of the charging plug. When the vehicle requires charging, a connection is established between the charging plug of the power supply equipment and the vehicle's charging socket, triggering a CC signal or CP signal to wake up the onboard charger and associated vehicle controller, placing the vehicle in a ready-to-charge state.

[0061] Preferably, before step S1, the method further includes:

[0062] S1′, determining whether the vehicle meets a preset battery charging condition; when the vehicle meets the preset battery charging condition, controlling the vehicle to enter the ready-to-charge state.

[0063] The preset battery charging conditions specifically include: the connection between the vehicle and the power supply device is confirmed to be normal, the charging control is confirmed to be normal, no charging fault is currently detected, and a charging request from the vehicle controller is received.

[0064] After the on-board charger and the relevant vehicle controller wake up, the on-board charger detects that the connection confirmation of the current vehicle is normal, that is, the CC signal connection is normal, and detects that the charging control confirmation is normal, that is, the CP signal is in the 9V PWM signal state, and no charging fault is currently detected, and when it receives a charging request from the vehicle controller, it determines that the vehicle meets the battery charging conditions and controls the vehicle to enter the ready-to-charge state.

[0065] Understandably, to improve the safety and reliability of the vehicle charging process, in embodiments of the present invention, a detection duration t, for example 1 minute, may also be set. After the onboard charger wakes up, it controls whether the vehicle enters the ready-to-charge state by detecting whether the vehicle meets the battery charging conditions within the detection duration t. If a CC signal connection abnormality is detected for 1 minute, or the CP is not in the 9V PWM state for 1 minute, or a charging fault is detected for 1 minute, or no charging request is received from the vehicle controller for 1 minute, the vehicle is controlled to exit charging, and the current charging cycle ends.

[0066] Furthermore, after the vehicle enters the ready-to-charge state, the onboard charger closes the AC voltage control switch S2. Figure 2 The AC voltage control switch S2 is used to control the conduction of the AC voltage transmission line between the power supply device and the vehicle. Once the connection between the power supply device's charging plug and the vehicle's charging socket is established, further closing switch S2 allows the vehicle to receive AC power from the power supply device and enter the battery charging state.

[0067] S2. Real-time detection of whether the AC voltage meets a preset AC voltage threshold condition.

[0068] After the vehicle enters the battery charging state, in order to prevent the abnormal input working voltage of the AC power from causing damage to vehicle-related components, in an embodiment of the present invention, the on-board charger samples the AC voltage and detects in real time whether the magnitude of the AC voltage meets a preset AC voltage threshold condition.

[0069] In the embodiment of the present invention, the AC voltage threshold condition is: the AC voltage is [U min , U max ] range; among which U min is the preset standard voltage lower limit, U max is the preset upper limit of standard voltage. When the AC voltage input by the on-board charger is [U min , U max ] range, it indicates that the current vehicle battery charging status is normal.

[0070] S3. When the AC voltage does not meet a preset AC voltage threshold condition, control the vehicle to be in a charging pause state.

[0071] In the embodiment of the present invention, when the onboard charger detects that the AC voltage is less than U min , or greater than U max When it is determined that the preset AC voltage threshold condition is not met, indicating that the current charging condition of the vehicle battery is abnormal, the vehicle is controlled to be in a suspended charging state to prevent excessive or insufficient AC current from causing damage to the vehicle battery.

[0072] Furthermore, the on-board charger adds 1 to the cumulative number of times that the AC voltage does not meet the preset AC voltage threshold condition in the current charging round.

[0073] It should be noted that, in the embodiment of the present invention, the suspended charging state means that the vehicle temporarily interrupts the charging process and can automatically resume charging when conditions are met.

[0074] S4. After controlling the vehicle to be in a charging pause state, detecting the cumulative number of times that the AC voltage does not meet a preset AC voltage threshold condition in a current charging round.

[0075] S5. When it is determined that the AC voltage does not meet the preset AC voltage threshold condition for a cumulative number of times greater than a preset number, control the vehicle to exit the current charging round.

[0076] The on-board charger obtains the cumulative number of times the AC voltage fails to meet a preset AC voltage threshold condition in the current charging cycle. If the cumulative number reaches the preset number, it indicates that there may be a charging fault that needs to be eliminated during the current charging process, and it is not suitable to continue charging the vehicle battery. Therefore, the vehicle is controlled to terminate charging, that is, exit the current charging cycle.

[0077] Furthermore, the method for processing abnormal charging voltage in the embodiment of the present invention further includes step S6:

[0078] S6. When the AC voltage meets a preset AC voltage threshold condition, control the vehicle to be in the battery charging state.

[0079] Specifically, after the vehicle is in the battery charging state, the on-board charger detects in real time whether the AC voltage meets the preset AC voltage threshold condition. If so, the vehicle is controlled to maintain the battery charging state; when the vehicle is in the suspended charging state, if it is detected that the AC voltage has recovered to meet the AC voltage threshold condition, the vehicle is controlled to re-enter the battery charging state.

[0080] Embodiment 1 of the present invention provides a method for handling abnormal charging voltage of a vehicle. After the vehicle enters the battery charging state, the method detects in real time whether the AC voltage meets a preset AC voltage threshold condition. When the AC voltage does not meet the preset AC voltage threshold condition, the vehicle is controlled to enter a suspended charging state, and the cumulative number of times the AC voltage does not meet the preset AC voltage threshold condition in the current charging cycle is detected. When it is determined that the cumulative number of times the AC voltage does not meet the preset AC voltage threshold condition is greater than a preset number, the vehicle is controlled to exit the current charging cycle. The technical means of the embodiment of the present invention can effectively avoid the situation in which the charging system and components are repeatedly restarted due to frequent and repeated abnormal AC voltage without exiting the charging process during the vehicle battery charging process, resulting in a reduction in the service life of the charging components or failure of the charging components. This effectively improves the safety and reliability of the vehicle battery charging process, reduces the risk of damage to charging system components, and effectively improves the user experience of the vehicle.

[0081] As a preferred embodiment, see Figure 3 , is a schematic diagram of the steps of a method for handling abnormal charging voltage of a vehicle provided by Example 2 of the present invention. Example 2 of the present invention is further implemented on the basis of Example 1. In one embodiment, step S3 specifically includes:

[0082] S31. When the AC voltage is greater than a preset standard voltage upper limit, control the vehicle to be in a charging pause state.

[0083] In the embodiment of the present invention, when the AC voltage is greater than the preset standard voltage upper limit value U max When the AC voltage does not meet the preset AC voltage threshold condition, the vehicle is controlled to suspend charging.

[0084] Furthermore, after step S31, the method further includes:

[0085] S32. When the AC voltage is greater than a preset upper limit of the withstand voltage, the AC voltage control switch of the vehicle is controlled to be in an off state; wherein the upper limit of the withstand voltage is greater than the upper limit of the standard voltage.

[0086] In the embodiment of the present invention, a withstand voltage upper limit value U of the internal components of the on-board charger is preset. d_max , used to represent the maximum AC voltage value that the internal components of the on-board charger can withstand. The setting of this value is generally related to the working conditions of components such as the varistor and PFC capacitor inside the on-board charger, and is not specifically limited here.

[0087] When the on-board charger detects that the AC voltage is greater than the upper limit of the withstand voltage U d_maxWhen the AC voltage control switch S2 is disconnected, the vehicle is controlled to suspend charging, and the AC voltage control switch S2 is disconnected to stop the AC power input of the power supply device, thereby protecting the internal components of the on-board charger and further ensuring the safety and reliability of the vehicle's battery charging process.

[0088] As a preferred embodiment, see Figure 3 When the onboard charger detects that the AC voltage is greater than the preset standard voltage upper limit U max , and is less than or equal to the preset upper limit of the withstand voltage U d_max After the vehicle is controlled to suspend charging, step S4 specifically includes:

[0089] S41: Detecting the cumulative number of times, in the current charging cycle, that the AC voltage is greater than the preset upper limit of the standard voltage and less than or equal to the preset upper limit of the withstand voltage;

[0090] Then, the step S5 is specifically as follows:

[0091] S51 . When the AC voltage is greater than the preset standard voltage upper limit and the cumulative number of times the AC voltage is less than or equal to the preset withstand voltage upper limit is greater than a first preset number, control the vehicle to exit the current charging round.

[0092] When the onboard charger detects that the AC voltage is greater than the preset upper limit of the withstand voltage U d_max After controlling the vehicle to pause charging and disconnecting switch S2, step S4 specifically includes:

[0093] S42: Detecting the cumulative number of times the AC voltage is greater than the preset upper limit of the withstand voltage in the current charging cycle;

[0094] Then, the step S5 is specifically as follows:

[0095] S52: When the AC voltage is greater than the preset withstand voltage threshold for a cumulative number of times greater than a second preset number of times, control the vehicle to exit the current charging round.

[0096] In the embodiment of the present invention, when the AC voltage is greater than the standard voltage upper limit value U max When the AC voltage does not meet the preset AC voltage threshold condition, the cumulative number of times is divided into two parts for judgment, that is, the cumulative number of times the AC voltage is greater than the preset standard voltage upper limit value and less than or equal to the preset tolerance voltage upper limit value n1, and the cumulative number of times the AC voltage is greater than the preset tolerance voltage upper limit value n2.

[0097] When the on-board charger detects that the AC voltage is (U max , Ud_max ] range, it is determined that in the current charging round, the AC voltage is (U max , U d_max ] is greater than a first preset number n1'. If n1>n1', the vehicle is controlled to exit charging.

[0098] When the on-board charger detects that the AC voltage is greater than U d_max When the AC voltage is greater than U d_max Whether the accumulated number of times n2 in the range is greater than the second preset number n2'. If n2>n2', the vehicle is controlled to exit charging.

[0099] Preferably, after step S42, the method further includes:

[0100] S52′: When the cumulative number of times that the AC voltage is greater than the preset withstand voltage threshold is less than or equal to the second preset number, after a second preset time, the AC voltage control switch of the vehicle is controlled to be in a closed state to put the vehicle into a battery charging state.

[0101] In the embodiment of the present invention, when the AC voltage is greater than U d_max Within the range, after the on-board charger controls the vehicle to suspend charging, it also controls the AC voltage control switch S2 to be disconnected. Therefore, when further judging that in the current charging round, the AC voltage is greater than U d_max When the cumulative number of times within the range does not exceed n2', after a second preset time t2, that is, a certain fault self-recovery time, the switch S2 is controlled to close to conduct the AC power transmission line, so that the vehicle re-enters the battery charging state.

[0102] It should be noted that the third preset time length t3' can be set and adjusted according to the control requirements of the charging system. For example, setting the third preset time length t3' to hundreds of milliseconds will not affect the beneficial effects of the present invention.

[0103] See also Figure 3 In another embodiment, the step S3 further includes:

[0104] S33. When the AC voltage is lower than a preset standard voltage lower limit, control the vehicle to be in a charging pause state.

[0105] In the embodiment of the present invention, when the AC voltage is less than the preset standard voltage lower limit U min When the AC voltage does not meet the preset AC voltage threshold condition, the vehicle is controlled to suspend charging.

[0106] Furthermore, when the onboard charger detects that the AC voltage is less than a preset standard voltage lower limit and controls the vehicle to suspend charging, step S4 specifically includes:

[0107] S43, detecting the cumulative number of times that the AC voltage is less than the preset standard voltage lower limit in the current charging round;

[0108] Then, the step S5 is specifically as follows:

[0109] S53: When the AC voltage is lower than the preset standard voltage lower limit value for a cumulative number of times greater than a third preset number, control the vehicle to exit the current charging round.

[0110] When the on-board charger detects that the AC voltage is less than U min When the AC voltage is less than U min Whether the accumulated number of times n3 in the range is greater than the third preset number n3'. If n3>n3', the vehicle is controlled to exit charging.

[0111] It should be noted that the first preset number n1', the second preset number n2' and the third preset number n3' can be set and adjusted according to the control requirements of the charging system. For example, setting n1'=n2'=n3'=10 times does not affect the beneficial effects of the present invention.

[0112] By adopting the technical means of the embodiments of the present invention, the cumulative number of times the AC voltage is in different threshold ranges is calculated separately to achieve different controls on the charging status of the vehicle, which can more effectively ensure the safety and reliability of the battery charging of the vehicle, while increasing the possibility of vehicle resumption of charging, and avoiding the situation in which, during the charging process of the vehicle battery, the AC voltage frequently and repeatedly becomes abnormal but the charging process is not exited, causing the charging system and components to be repeatedly restarted, resulting in a reduction in the service life of the charging components or failure of the charging components, reducing the risk of loss of charging system components, and effectively improving the user's car experience.

[0113] As a preferred embodiment, when the onboard charger detects that the AC voltage is greater than the preset standard voltage upper limit U max , and is less than or equal to the preset upper limit of the withstand voltage U d_max When, after step S31 and before step S41, the method further includes step S41':

[0114] S41′, detecting the duration of the AC voltage being greater than the preset upper limit of the standard voltage and less than or equal to the preset upper limit of the withstand voltage; and

[0115] When the AC voltage is greater than the preset standard voltage upper limit and the duration of being less than or equal to the preset tolerance voltage upper limit is greater than a first preset time length, controlling the vehicle to exit the current charging round;

[0116] When the AC voltage is greater than the preset standard voltage upper limit, and the duration of being less than or equal to the preset withstand voltage upper limit is less than or equal to the first preset time duration, step S41 is executed.

[0117] In the embodiment of the present invention, when the onboard charger detects that the AC voltage is (U max , U d_max ] range, first determine whether the AC voltage is within (U max , U d_max ] is greater than a first preset duration t1'. If t1>t1', the vehicle is directly controlled to exit charging without further determining whether the cumulative number n1 exceeds the first preset number n1'. If t1≤t1', further determination is made whether the cumulative number n1 exceeds the first preset number n1'.

[0118] When the on-board charger detects that the AC voltage is lower than the preset standard voltage lower limit value U min When, after step S33 and before step S43, the method further includes step S43':

[0119] S43', detecting the duration of time during which the AC voltage is less than the preset standard voltage lower limit; and

[0120] When the AC voltage is less than the preset standard voltage lower limit for a duration greater than a third preset time period, controlling the vehicle to exit the current charging round;

[0121] When the duration that the AC voltage is less than the preset standard voltage lower limit is less than or equal to the third preset time length, executing: detecting the cumulative number of times that the AC voltage does not meet the preset AC voltage threshold condition in the current charging round.

[0122] In the embodiment of the present invention, when the onboard charger detects that the AC voltage is less than U min When the AC voltage is less than U min The duration t3 within the range is greater than the third preset duration t3. If t3>t3', the vehicle is directly controlled to exit charging without further determining whether the cumulative number n3 exceeds the first preset number n3'. If t3≤t3', further determination is made whether the cumulative number n3 exceeds the first preset number n3'.

[0123] It should be noted that the first preset time length t1' and the third preset time length t3' can be set and adjusted according to the control requirements of the charging system. Since the first preset time length t1' is the high voltage duration and the third preset time length t3' is the low voltage duration, the first preset time length t1' can be appropriately shorter than the third preset time length t3'. For example, setting the first preset time length t1' to a few minutes and the third preset time length t3' to ten minutes will not affect the beneficial effects achieved by the present invention.

[0124] By adopting the technical means of the embodiment of the present invention, when the on-board charger detects that the AC voltage is less than U min , or in (U max , U d_max ] range, it is necessary to first determine the duration of the voltage range in which the AC voltage is located, and control the vehicle charging state based on the determination result, which can effectively avoid the situation where the input voltage is abnormal for a long time but the charging process is not terminated, resulting in the vehicle not being charged, or even the battery power decreasing instead of increasing due to power consumption of related components such as DCDC, controller, and cooling components, which can effectively reduce the energy loss of the vehicle; and for the AC voltage greater than U d_max When the AC voltage is abnormal, the vehicle is directly controlled to suspend charging, and the AC voltage switch S2 is turned off to stop the AC power input. The judgment of the duration of the voltage range in which the AC voltage is located is not performed, which can more effectively prevent the internal components of the on-board charger from being damaged. The cumulative number of times the AC voltage is in different voltage ranges is further judged, and the vehicle charging state is controlled according to the judgment result. This can effectively avoid the situation in which, during the vehicle battery charging process, the charging system and components are repeatedly restarted due to frequent abnormal AC voltage without exiting the charging process, resulting in a reduction in the service life of the charging components or failure of the charging components. The embodiment of the present invention can comprehensively consider various factors, effectively improve the safety and reliability of the vehicle battery charging process, and enhance the user experience.

[0125] See also Figure 4 , is a schematic diagram of the structure of a vehicle charging voltage abnormality processing device provided by the third embodiment of the present invention. The third embodiment of the present invention provides a vehicle charging voltage abnormality processing device 30, including: a switch control module 31, a voltage threshold condition detection module 32, a first charging state control module 33, a cumulative number calculation module 34 and a second charging state control module 35; wherein,

[0126] The switch control module 31 is used to control the AC voltage control switch of the vehicle to be in a closed state after the vehicle enters the ready-to-charge state, so that the vehicle enters the battery charging state;

[0127] The voltage threshold condition detection module 32 is used to detect in real time whether the AC voltage meets the preset AC voltage threshold condition;

[0128] The first charging state control module 33 is configured to control the vehicle to be in a suspended charging state when the AC voltage does not meet a preset AC voltage threshold condition;

[0129] The cumulative number calculation module 34 is configured to detect the cumulative number of times the AC voltage fails to meet a preset AC voltage threshold condition in a current charging round after the vehicle is placed in a suspended charging state;

[0130] The second charging state control module 35 is configured to control the vehicle to exit the current charging round when the cumulative number of times that the AC voltage is determined to not meet the preset AC voltage threshold condition is greater than a preset number.

[0131] It should be noted that the device for processing abnormal charging voltage of a vehicle provided in an embodiment of the present invention is used to execute all the process steps of the method for processing abnormal charging voltage of a vehicle provided in the above-mentioned embodiment one or two. The working principles and beneficial effects of the two correspond one to one, and therefore will not be repeated here.

[0132] Embodiment 3 of the present invention provides a device for processing abnormal charging voltage of a vehicle, which can effectively avoid the situation in which, during the charging process of the vehicle battery, the AC voltage frequently and repeatedly becomes abnormal but the charging process is not exited, causing the charging system and components to be repeatedly restarted, resulting in a reduction in the service life of the charging components or failure of the charging components. It effectively improves the safety and reliability of the vehicle battery charging process, reduces the risk of loss of charging system components, and effectively improves the user's car experience.

[0133] See also Figure 5 , is a schematic diagram of the structure of a device for handling abnormal vehicle charging voltage, provided in a fourth embodiment of the present invention. The fourth embodiment of the present invention provides a device 40 for handling abnormal vehicle charging voltage, comprising a processor 41, a memory 42, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the method for handling abnormal vehicle charging voltage, as provided in the first or second embodiment, is implemented.

[0134] An embodiment of the present invention also provides a computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the method for processing the abnormal charging voltage of the vehicle provided in the above-mentioned embodiment one or two.

[0135] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing related hardware through a computer program. The program can be stored in a computer-readable storage medium, and when executed, the program can include the processes in the above-described method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0136] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for handling abnormal charging voltage of a vehicle, characterized in that: include: After the vehicle enters a ready-to-charge state, controlling the AC voltage control switch of the vehicle to be in a closed state, so that the vehicle enters a battery charging state; detecting in real time whether the AC voltage satisfies a preset AC voltage threshold condition; when the AC voltage does not satisfy the preset AC voltage threshold condition, controlling the vehicle to enter a suspended charging state; after controlling the vehicle to enter the suspended charging state, detecting the cumulative number of times the AC voltage does not satisfy the preset AC voltage threshold condition in a current charging round; and when it is determined that the cumulative number of times the AC voltage does not satisfy the preset AC voltage threshold condition is greater than a preset number, controlling the vehicle to exit the current charging round; Furthermore, when the AC voltage does not meet a preset AC voltage threshold condition, controlling the vehicle to be in a suspended charging state specifically includes: when the AC voltage is greater than a preset standard voltage upper limit value, controlling the vehicle to be in a suspended charging state; After controlling the vehicle to be in a charging pause state when the AC voltage is greater than a preset standard voltage upper limit, the method further includes: controlling an AC voltage control switch of the vehicle to be in an off state when the AC voltage is greater than a preset withstand voltage upper limit; wherein the withstand voltage upper limit is greater than the standard voltage upper limit; And, the detection of the cumulative number of times that the AC voltage does not meet the preset AC voltage threshold condition in the current charging round specifically includes: detecting the cumulative number of times that the AC voltage is greater than the preset standard voltage upper limit value and less than or equal to the preset tolerance voltage upper limit value in the current charging round; then, when it is determined that the AC voltage does not meet the preset AC voltage threshold condition for a cumulative number of times is greater than a preset number, controlling the vehicle to exit the current charging round specifically includes: when the AC voltage is greater than the preset standard voltage upper limit value and less than or equal to the preset tolerance voltage upper limit value for a cumulative number of times greater than a first preset number, controlling the vehicle to exit the current charging round.

2. The method for handling abnormal charging voltage of a vehicle according to claim 1, wherein: After controlling the vehicle to be in a suspended charging state, and before detecting the cumulative number of times that the AC voltage does not meet the preset AC voltage threshold condition in the current charging round, the method further includes: detecting the duration that the AC voltage is greater than the preset standard voltage upper limit value and is less than or equal to the preset tolerance voltage upper limit value; when the AC voltage is greater than the preset standard voltage upper limit value and is less than or equal to the preset tolerance voltage upper limit value for a duration greater than a first preset duration, controlling the vehicle to exit the current charging round; when the AC voltage is greater than the preset standard voltage upper limit value and is less than or equal to the preset tolerance voltage upper limit value for a duration less than or equal to the first preset duration, executing: detecting the cumulative number of times that the AC voltage does not meet the preset AC voltage threshold condition in the current charging round.

3. The method for handling abnormal charging voltage of a vehicle according to claim 1, wherein: The detecting of the cumulative number of times that the AC voltage fails to satisfy a preset AC voltage threshold condition in the current charging cycle specifically includes: detecting the cumulative number of times that the AC voltage is greater than a preset upper limit of a withstand voltage in the current charging cycle; then, when it is determined that the cumulative number of times that the AC voltage fails to satisfy the preset AC voltage threshold condition is greater than a preset number, controlling the vehicle to exit the current charging cycle specifically includes: controlling the vehicle to exit the current charging cycle when the cumulative number of times that the AC voltage is greater than the preset withstand voltage threshold is greater than a second preset number.

4. The method for handling abnormal charging voltage of a vehicle according to claim 3, wherein: After detecting that the AC voltage is greater than the preset upper limit of the withstand voltage for a cumulative number of times in the current charging round, the method further includes: when the AC voltage is greater than the preset withstand voltage threshold for a cumulative number of times less than or equal to a second preset number of times, after a second preset time period, controlling the AC voltage control switch of the vehicle to be in a closed state to enable the vehicle to enter a battery charging state.

5. The method for handling abnormal charging voltage of a vehicle according to claim 1, wherein: When the AC voltage does not meet a preset AC voltage threshold condition, controlling the vehicle to be in a suspended charging state specifically includes: when the AC voltage is less than a preset standard voltage lower limit, controlling the vehicle to be in a suspended charging state.

6. The method for handling abnormal charging voltage of a vehicle according to claim 5, wherein: The detecting of the cumulative number of times that the AC voltage fails to satisfy a preset AC voltage threshold condition in the current charging round specifically includes: detecting the cumulative number of times that the AC voltage is less than the preset standard voltage lower limit in the current charging round; then, when it is determined that the cumulative number of times that the AC voltage fails to satisfy the preset AC voltage threshold condition is greater than a preset number, controlling the vehicle to exit the current charging round specifically includes: controlling the vehicle to exit the current charging round when the cumulative number of times that the AC voltage is less than the preset standard voltage lower limit is greater than a third preset number.

7. The method for handling abnormal charging voltage of a vehicle according to claim 6, wherein: After controlling the vehicle to be in a suspended charging state, and before detecting the cumulative number of times that the AC voltage fails to meet a preset AC voltage threshold condition in a current charging round, the method further includes: detecting a duration during which the AC voltage is less than a preset standard voltage lower limit; when the duration during which the AC voltage is less than the preset standard voltage lower limit is greater than a third preset duration, controlling the vehicle to exit the current charging round; and when the duration during which the AC voltage is less than the preset standard voltage lower limit is less than or equal to the third preset duration, executing: detecting the cumulative number of times the AC voltage fails to meet a preset AC voltage threshold condition in the current charging round.

8. The method for handling abnormal charging voltage of a vehicle according to claim 1, wherein: The method further includes: when the AC voltage meets a preset AC voltage threshold condition, controlling the vehicle to be in the battery charging state.

9. The method for handling abnormal charging voltage of a vehicle according to claim 1, wherein: After the vehicle enters the ready-to-charge state, before controlling the vehicle's AC voltage control switch to be in a closed state to conduct the AC voltage transmission circuit between the vehicle battery and the power supply system, the method also includes: determining whether the vehicle meets preset battery charging conditions; when the vehicle meets the preset battery charging conditions, controlling the vehicle to enter the ready-to-charge state.

10. A device for processing abnormal charging voltage of a vehicle, characterized in that: include: A switch control module is used to control the AC voltage control switch of the vehicle to be in a closed state after the vehicle enters the ready-to-charge state, so that the vehicle enters the battery charging state; a voltage threshold condition detection module is used to detect in real time whether the AC voltage meets a preset AC voltage threshold condition; a first charging state control module, configured to control the vehicle to be in a suspended charging state when the AC voltage does not meet a preset AC voltage threshold condition; a cumulative number calculation module, configured to detect, after controlling the vehicle to be in a suspended charging state, a cumulative number of times that the AC voltage fails to meet a preset AC voltage threshold condition in a current charging round; a second charging state control module, configured to control the vehicle to exit a current charging round when the cumulative number of times that it is determined that the AC voltage does not meet a preset AC voltage threshold condition is greater than a preset number; Furthermore, when the AC voltage does not meet a preset AC voltage threshold condition, controlling the vehicle to be in a suspended charging state specifically includes: when the AC voltage is greater than a preset standard voltage upper limit value, controlling the vehicle to be in a suspended charging state; After controlling the vehicle to be in a charging pause state when the AC voltage is greater than a preset standard voltage upper limit, the method further includes: controlling an AC voltage control switch of the vehicle to be in an off state when the AC voltage is greater than a preset withstand voltage upper limit; wherein the withstand voltage upper limit is greater than the standard voltage upper limit; And, the detection of the cumulative number of times that the AC voltage does not meet the preset AC voltage threshold condition in the current charging round specifically includes: detecting the cumulative number of times that the AC voltage is greater than the preset standard voltage upper limit value and less than or equal to the preset tolerance voltage upper limit value in the current charging round; then, when it is determined that the AC voltage does not meet the preset AC voltage threshold condition for a cumulative number of times is greater than a preset number, controlling the vehicle to exit the current charging round specifically includes: when the AC voltage is greater than the preset standard voltage upper limit value and less than or equal to the preset tolerance voltage upper limit value for a cumulative number of times greater than a first preset number, controlling the vehicle to exit the current charging round.

11. A device for processing abnormal charging voltage of a vehicle, characterized in that: The invention comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for processing abnormal charging voltage of a vehicle according to any one of claims 1 to 9 is implemented.

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