Vehicle management methods and vehicles for low-temperature and low-battery conditions

Abstract

The application discloses a kind of vehicle management method and vehicle for low temperature low power vehicle condition, the method comprises the following steps: vehicle power on, obtain the initial battery state of power battery;The initial battery state includes initial battery temperature and initial battery power;Obtain the battery performance parameter of power battery;The battery performance parameter includes battery temperature rise rate, battery average discharge power and preset temperature threshold;Based on the initial battery state and the battery performance parameter, determine the estimated consumption power of power battery allowed to charge power recovery;When driver needs to drive vehicle, whether to allow vehicle to travel based on the initial battery power and the estimated consumption power is judged.This application can prevent vehicle from lying in the nest during driving, improve the safety of vehicle use, and improve user experience.

Description

Technical Field

[0001] This invention relates to new energy vehicles, specifically to a vehicle management method and a vehicle for low-temperature and low-battery vehicle conditions. Background Technology

[0002] The permissible charging power of a power battery is significantly affected by temperature. In low-temperature environments, the lower the battery temperature, the lower the permissible charging power. For lithium iron phosphate batteries, when the battery temperature drops below -25°C, the permissible charging power is extremely low, even zero. However, as the battery temperature rises, the permissible charging power gradually increases. When the permissible charging power is zero, to avoid overcharging, the battery is typically kept in a micro-discharge state with a discharge power of approximately 1 kW. Therefore, when the battery temperature is extremely low, even after the engine is started, the battery charge will gradually decrease during vehicle operation until the battery temperature rises and the permissible charging power recovers, at which point the battery charge will stabilize and gradually increase.

[0003] When the battery temperature is extremely low (e.g., -30℃, -32℃) and the battery charge is also low (e.g., SOC < 3%, SOC < 2%), the battery charge may drop to zero during vehicle operation. Once the battery charge reaches zero, it cannot maintain its discharge capacity, causing the vehicle to be unable to start and become stranded, posing a significant safety hazard. Although current technology can control engine operation to heat the battery and increase charging power, the battery temperature takes time to rise at extremely low temperatures. If the battery charge is depleted during this temperature rise process, the vehicle will become stranded. Therefore, how to prevent vehicles from becoming stranded in low-temperature, low-charge conditions is a pressing issue that the automotive industry needs to address. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a vehicle management method and vehicle for low temperature and low battery conditions, which can prevent the vehicle from breaking down during driving, improve vehicle safety, and enhance user experience.

[0005] A vehicle management method for low-temperature and low-battery vehicle conditions according to the present invention includes the following steps:

[0006] When the vehicle is powered on, the initial battery state of the power battery is obtained; the initial battery state includes the initial battery temperature, the initial battery charge, and the initial allowable charging power of the power battery.

[0007] Obtain the battery performance parameters of the power battery; the battery performance parameters include the battery temperature rise rate, the average battery discharge power, the preset temperature threshold, and the preset power threshold;

[0008] Based on the initial battery state and the battery performance parameters, it is determined whether the vehicle is allowed to drive.

[0009] Furthermore, the step of determining whether vehicle operation is permitted based on the initial battery state and the battery performance parameters includes:

[0010] Based on the initial battery temperature, the preset temperature threshold, the initial allowable charging power of the power battery, and the preset power threshold, determine whether it is necessary to calculate the estimated power consumption for the recovery of the allowable charging power of the power battery.

[0011] If it is determined that there is no need to calculate the estimated power consumption required for the battery to recover its charging power, then the vehicle is allowed to drive.

[0012] If it is determined that the estimated power consumption required for the battery to recover its charging power needs to be calculated, then when the driver needs to drive the vehicle, the estimated power consumption is calculated, and based on the initial battery power and the estimated power consumption, it is determined whether the vehicle is allowed to drive.

[0013] Furthermore, the step of calculating the estimated power consumption when the driver needs to drive the vehicle, and determining whether to allow the vehicle to drive based on the initial battery charge and the estimated power consumption, includes:

[0014] When the driver needs to drive the vehicle, the estimated time for the power battery to recover its charging power is determined based on the initial battery temperature, the preset temperature threshold, and the battery temperature rise rate.

[0015] Based on the estimated time and the average discharge power of the power battery, the estimated power consumption required for the power battery to recover its charging power is determined.

[0016] Based on the initial battery charge and the estimated power consumption, it is determined whether the vehicle is allowed to drive.

[0017] Furthermore, the preset power threshold is a calibration value. When the real-time allowable charging power of the power battery is not less than the preset power threshold, the power battery charge will no longer decrease during vehicle operation after the engine starts. The preset temperature threshold is a calibration value. When the real-time battery temperature of the power battery is at the preset temperature threshold, the real-time allowable charging power of the power battery is the preset power threshold. The estimated power consumption for the recovery of the allowable charging power of the power battery refers to the power consumption required for the real-time allowable charging power of the power battery to rise from the initial allowable charging power of the power battery to the preset power threshold.

[0018] Furthermore, the method also includes: if it is determined that the estimated power consumption required to restore the allowable charging power of the power battery needs to be calculated, then determining whether the driver needs to drive the vehicle; the determination of whether the driver needs to drive the vehicle includes:

[0019] Determine whether the driver needs to drive the vehicle;

[0020] Obtain the vehicle's braking and gear status;

[0021] If the brake is depressed and the gear is shifted from P to D or R, it is determined that the driver needs to drive the vehicle. The estimated power consumption is calculated, and based on the initial battery power and the estimated power consumption, it is determined whether the vehicle is allowed to drive.

[0022] If the brake is not depressed or the gear is in Park (P) position, it is determined that the driver does not need to drive the vehicle, and therefore it is not necessary to determine whether the vehicle is allowed to drive.

[0023] Furthermore, the step of determining whether the vehicle is permitted to drive based on the initial battery charge and the estimated power consumption includes:

[0024] If the initial battery charge is less than the estimated power consumption, then it is determined that the vehicle is not allowed to drive.

[0025] If the initial battery charge is not less than the estimated power consumption, then the vehicle is permitted to drive.

[0026] Furthermore, when it is determined that the vehicle is permitted to drive, the vehicle's driving torque is not restricted;

[0027] If it is determined that the vehicle is not allowed to move, the vehicle's driving torque is limited, and it is determined whether to resume vehicle movement. If the vehicle is resumed to move, the vehicle's driving torque is not limited; if the vehicle is not resumed to move, the vehicle's driving torque is limited.

[0028] Furthermore, the determination of whether to resume vehicle operation includes:

[0029] The real-time battery status of the power battery is obtained; the real-time battery status includes real-time battery temperature, real-time battery charge, and real-time allowable charging power.

[0030] Obtain the vehicle navigation status, and when the user turns on navigation, obtain the estimated driving distance and estimated driving time;

[0031] Obtain vehicle energy consumption information, and determine the estimated power consumption based on the vehicle energy consumption information, the estimated driving distance, and the estimated driving time;

[0032] Based on the real-time battery temperature, real-time battery level, real-time allowable charging power, estimated driving power consumption, preset temperature threshold, preset power threshold, and estimated power consumption, determine whether to resume vehicle operation.

[0033] Furthermore, if the real-time battery temperature is not less than the preset temperature threshold, the real-time battery charge is not less than the estimated power consumption, the real-time allowable charging power is not less than the preset power threshold, or the estimated driving power consumption is not greater than the estimated power consumption, then it is determined that vehicle driving will be resumed; otherwise, it is determined that vehicle driving will not be resumed.

[0034] One type of vehicle in this invention includes the vehicle management method described above for low temperature and low battery conditions.

[0035] The beneficial effects of this invention are:

[0036] (1) The present invention can improve the safety of vehicle use under special conditions by judging whether the vehicle is at risk of breaking down during driving in advance when the power battery is at low temperature and low power. If there is a risk, the vehicle should be prohibited from being used, thus preventing the vehicle from breaking down due to the battery power dropping to 0 during driving.

[0037] (2) The present invention can restore the vehicle to driving status in a timely manner when the vehicle condition permits, avoid the long-term prohibition of vehicle use, and improve the user experience. Attached Figure Description

[0038] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0039] Figure 1 This is a schematic diagram of the process of the present invention;

[0040] Figure 2 To Figure 1 A flowchart detailing the steps;

[0041] Figure 3 To Figure 2 A flowchart further detailing the steps;

[0042] Figure 4 To Figure 2 or Figure 3 A flowchart illustrating the detailed steps of S5 in the middle. Detailed Implementation

[0043] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0044] like Figures 1-4As shown in this embodiment, a vehicle management method for low-temperature and low-battery vehicle conditions includes the following steps:

[0045] S1. The vehicle is powered on, and the initial battery state of the power battery is obtained. The initial battery state includes the initial battery temperature, the initial battery charge, and the initial allowable charging power of the power battery. The initial battery temperature can be the lowest temperature of each individual cell of the power battery.

[0046] When the vehicle is powered on, if the initial battery temperature is low, that is, if the initial battery temperature is below the preset heating threshold, the vehicle will start to heat the power battery through the thermal management system. Heating the power battery is an existing technology in this field, and its specific principle will not be elaborated here.

[0047] S2. Obtain the battery performance parameters of the power battery; the battery performance parameters include the battery temperature rise rate, the average battery discharge power, the preset temperature threshold, and the preset power threshold.

[0048] The preset power threshold is a calibration value. When the real-time allowable charging power of the power battery is not less than the preset power threshold, after the engine starts, the engine output power can generate electricity through the generator to charge the battery, and the power battery charge will no longer decrease during vehicle operation. The preset temperature threshold is a calibration value. When the real-time battery temperature of the power battery is at the preset temperature threshold, the real-time allowable charging power of the power battery is the preset power threshold. The calibration value of the preset power threshold is obtained through actual vehicle testing and is generally 3kW-5kW.

[0049] The battery temperature rise rate is also a calibration value, obtained through real-vehicle testing under different ambient and battery temperatures. For example, when the ambient temperature is -30℃ and the initial battery temperature is -30℃, the vehicle is driven, and the battery temperature rise value and rise time are used to obtain the measured battery temperature rise rate under the ambient and initial battery temperatures. Then, test data of the battery temperature rise rate are obtained under different ambient and initial battery temperatures. These test data are stored in the controller in the form of a table through calibration settings. By comparing the initial battery temperature and ambient temperature of the power battery with the test data, the battery temperature rise rate of the power battery at this time can be obtained by looking up the table.

[0050] S3. Based on the initial battery state and the battery performance parameters, determine whether the vehicle is allowed to drive.

[0051] This step specifically includes:

[0052] S301. Based on the initial battery temperature, the preset temperature threshold, the initial allowable charging power of the power battery, and the preset power threshold, determine whether it is necessary to calculate the estimated power consumption for the recovery of the allowable charging power of the power battery; the estimated power consumption for the recovery of the allowable charging power of the power battery refers to the power consumed when the real-time allowable charging power of the power battery increases from the initial allowable charging power of the power battery to the preset power threshold. Step S301 specifically includes:

[0053] S3011. If the initial battery temperature is not less than the preset temperature threshold, or the initial allowable charging power of the power battery is not less than the preset power threshold, it is determined that there is no need to calculate the estimated power consumption for the recovery of the allowable charging power of the power battery, and then the vehicle is allowed to drive, that is, directly proceed to step S6.

[0054] S3012. If the initial battery temperature is less than the preset temperature threshold, or / and the initial allowable charging power of the power battery is less than the preset power threshold, it is determined that the estimated power consumption for the recovery of the allowable charging power of the power battery needs to be calculated, and then proceed to step S302.

[0055] S302. Determine whether the vehicle is permitted to drive. The determination of whether the driver needs to drive the vehicle includes:

[0056] S3021. Obtain the vehicle's brake and gear status;

[0057] S3022. If the brake is depressed and the gear is switched from P to D or R, it is determined that the driver needs to drive the vehicle. The estimated power consumption is calculated, and based on the initial battery power and the estimated power consumption, it is determined whether the vehicle is allowed to drive, i.e., proceed to step S303.

[0058] S3023. If the brake is not depressed or the gear is in P position, it is determined that the driver does not need to drive the vehicle. Therefore, it is not necessary to determine whether the vehicle is allowed to drive, and the process returns to step S3021.

[0059] S303. Calculate the estimated power consumption, and based on the initial battery charge and the estimated power consumption, determine whether the vehicle is allowed to drive. This step specifically includes:

[0060] S3031. When the driver needs to drive the vehicle, the estimated time for the power battery to recover its charging power is determined based on the initial battery temperature, the preset temperature threshold, and the battery temperature rise rate.

[0061] Specifically, the formula for calculating the estimated time for the charging power recovery of the power battery is t=(Ttar-Tmin) / a; where t is the estimated time for the charging power recovery of the power battery, Ttar is the preset temperature threshold, Tmin is the initial battery temperature, and a is the battery temperature rise rate.

[0062] S3032. Based on the estimated time and the average discharge power of the power battery, determine the estimated power consumption required for the power battery to recover its charging power.

[0063] Specifically, the formula for calculating the estimated power consumption for the recovery of the charging power of the power battery is Etar=P*t; where Etar is the estimated power consumption for the recovery of the charging power of the power battery, P is the average discharge power of the power battery, and t is the estimated time for the recovery of the charging power of the power battery.

[0064] The average discharge power of the power battery is obtained by testing the actual vehicle under different ambient temperatures, power battery temperatures, and remaining charge levels. For example, when the power battery temperature is -30℃ and the battery charge is 5%, the vehicle is driven after the engine is started. The average discharge power of the power battery is obtained by recording the amount of electricity consumed and the time when the power battery charge drops to its lowest value. Then, test data of the average discharge power of the power battery are obtained under different ambient temperatures, power battery temperatures, and remaining charge levels. These test data are stored in the controller in the form of a table through calibration settings. By comparing the ambient temperature, power battery temperature, and remaining charge level of the vehicle at this time with the test data, the average discharge power of the power battery at this time can be obtained by looking up the table.

[0065] The allowable charging power of a power battery is significantly affected by temperature. In low-temperature environments, the lower the battery temperature, the lower the allowable charging power. As the battery temperature rises, the allowable charging power gradually increases. When the allowable charging power of the power battery is 0, to avoid overcharging, the battery is typically controlled in a micro-discharge state, with a discharge power of approximately 1 kW. Therefore, when the battery temperature is extremely low, even after the engine is started, the battery charge will gradually decrease during vehicle operation until the battery temperature rises and the allowable charging power recovers, at which point the battery charge will stabilize and gradually increase. At extremely low temperatures, the battery temperature takes time to rise. If the battery charge is depleted during this temperature rise process, the vehicle may become stuck while driving. This step calculates the estimated time for the allowable charging power to recover and the estimated energy consumption for this recovery, which helps in subsequent judgments regarding whether the vehicle can continue driving.

[0066] S3033. Based on the initial battery charge and the estimated power consumption, determine whether the vehicle is allowed to drive.

[0067] Specifically, if the initial battery charge is less than the estimated power consumption, it is determined that the vehicle is not allowed to drive, and the process proceeds to step S4; if the initial battery charge is not less than the estimated power consumption, it is determined that the vehicle is allowed to drive, and the process proceeds to step S6.

[0068] S4. When it is determined that the vehicle is not allowed to drive, the vehicle's driving torque is limited. At this time, the vehicle's infotainment system can also notify the user that the vehicle cannot be driven, indicating that the battery temperature is low, the vehicle is prohibited from driving, and the waiting time. Then, proceed to step S5.

[0069] S5. Determine whether to resume vehicle operation; if vehicle operation is resumed, the vehicle drive torque is not limited; if vehicle operation is not resumed, the vehicle drive torque continues to be limited.

[0070] This step specifically includes:

[0071] S501. Obtain the real-time battery status of the power battery; the real-time battery status includes real-time battery temperature, real-time battery charge, and real-time allowable charging power.

[0072] S502. Obtain vehicle navigation status. When the user turns on navigation, obtain the estimated driving distance and estimated driving time.

[0073] S503. Obtain vehicle energy consumption information, and determine the estimated power consumption based on the vehicle energy consumption information, the estimated driving distance, and the estimated driving time. The vehicle energy consumption information may be official energy consumption information for the vehicle model stored in the vehicle's infotainment system or the cloud; it may also be personalized vehicle energy consumption information stored in the vehicle's infotainment system or the cloud, tailored to the user's habits. For example, personalized vehicle energy consumption information may be power consumption per kilometer or power consumption per unit driving time, calculated based on the user's historical total driving distance, historical total driving time, and historical total power consumption; or it may be the power consumption per kilometer or power consumption per unit driving time for all users of the vehicle model connected to the cloud.

[0074] S504. Based on the real-time battery temperature, real-time battery level, real-time allowable charging power, estimated driving power consumption, preset temperature threshold, preset power threshold, and estimated power consumption, determine whether to resume vehicle operation:

[0075] If the real-time battery temperature is not less than the preset temperature threshold, the real-time battery charge is not less than the estimated power consumption, the real-time allowed charging power is not less than the preset power threshold, or the estimated driving power consumption is not greater than the estimated power consumption, then it is determined that vehicle driving will resume; then, the vehicle system will cancel the notification to the user that the vehicle cannot be driven, the notification that the battery temperature is low, the vehicle is prohibited from driving, and the waiting time, and proceed to step S6.

[0076] Otherwise, the decision will not be made to restore vehicle operation.

[0077] That is, vehicle driving will not be resumed only if the real-time battery temperature is less than the preset temperature threshold, the real-time battery charge is less than the estimated power consumption, the real-time allowable charging power is less than the preset power threshold, and the expected driving power consumption is greater than the estimated power consumption.

[0078] S6. When it is determined that the vehicle is allowed to drive, the vehicle's driving torque is not limited.

[0079] As can be seen from the above, the vehicle management method for low temperature and low battery conditions in this embodiment can improve vehicle safety under special conditions by judging in advance whether there is a risk of the vehicle breaking down during driving when the power battery is low temperature and low battery. If there is a risk, the vehicle should be prohibited from being used, thus preventing the vehicle from breaking down due to the battery charge dropping to 0 during driving.

[0080] Furthermore, the vehicle management method for low temperature and low battery conditions in this embodiment can restore vehicle operation in a timely manner when the vehicle condition permits, avoiding prolonged vehicle prohibition and improving user experience.

[0081] One vehicle in this embodiment includes the vehicle management method described above for low temperature and low battery conditions.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A vehicle management method for a low-temperature low-battery vehicle condition, characterized by, The method comprises the following steps: The vehicle is powered on, and an initial battery state of the power battery is obtained; The initial battery state comprises an initial battery temperature, an initial battery power, and an initial power battery allowable charging power; A battery performance parameter of the power battery is obtained; the battery performance parameter comprises a battery temperature rise rate, a battery average discharge power, a preset temperature threshold, and a preset power threshold; It is judged whether the vehicle is allowed to travel based on the initial battery state and the battery performance parameter; The judgment of whether the vehicle is allowed to travel based on the initial battery state and the battery performance parameter comprises: Based on the initial battery temperature, the preset temperature threshold, the initial power battery allowable charging power, and the preset power threshold, it is judged whether the estimated consumption power of the power battery allowable charging power recovery needs to be calculated; If it is judged that the estimated consumption power of the power battery allowable charging power recovery does not need to be calculated, the vehicle is allowed to travel; If it is judged that the estimated consumption power of the power battery allowable charging power recovery needs to be calculated, when the driver needs to drive the vehicle, the estimated consumption power is calculated, and it is judged whether the vehicle is allowed to travel based on the initial battery power and the estimated consumption power.

2. The vehicle management method for cryogenic low-battery vehicle conditions according to claim 1, characterized by, The calculation of the estimated consumption power when the driver needs to drive the vehicle and the judgment of whether the vehicle is allowed to travel based on the initial battery power and the estimated consumption power comprise: When the driver needs to drive the vehicle, the estimated time of the power battery allowable charging power recovery is determined based on the initial battery temperature, the preset temperature threshold, and the battery temperature rise rate; The estimated consumption power of the power battery allowable charging power recovery is determined based on the estimated time and the power battery average discharge power; It is judged whether the vehicle is allowed to travel based on the initial battery power and the estimated consumption power.

3. The vehicle management method for cryogenic low-battery vehicle conditions of claim 2, wherein: The preset power threshold is a calibration value, when the real-time allowable charging power of the power battery is not less than the preset power threshold, the power battery power does not decrease during the vehicle travel after the engine is started; The preset temperature threshold is a calibration value, when the real-time battery temperature of the power battery is the preset temperature threshold, the real-time allowable charging power of the power battery is the preset power threshold; the estimated consumption power of the power battery allowable charging power recovery refers to the power consumed when the real-time allowable charging power of the power battery rises from the initial power battery allowable charging power to the preset power threshold.

4. The vehicle management method for cryogenic low-battery vehicle conditions of claim 1, wherein, The method further comprises: if it is judged that the estimated consumption power of the power battery allowable charging power recovery needs to be calculated, it is judged whether the driver needs to drive the vehicle; the judgment of whether the driver needs to drive the vehicle comprises: The states of the brake and the gear of the vehicle are obtained; If the brake is in the state of being stepped on, and the gear is switched from P gear to D gear or R gear, it is judged that the driver needs to drive the vehicle, the estimated consumption power is calculated, and it is judged whether the vehicle is allowed to travel based on the initial battery power and the estimated consumption power. If the brake is not in the depressed state or the gear remains in the P position, it is determined that the driver does not need to drive the vehicle, and it is not necessary to determine whether the vehicle is allowed to travel.

5. The vehicle management method for cryogenic low-battery vehicle conditions of claim 2, wherein, The determination of whether the vehicle is allowed to travel based on the initial battery power and the estimated consumption power includes: If the initial battery power is less than the estimated consumption power, it is determined that the vehicle is not allowed to travel. If the initial battery power is not less than the estimated consumption power, it is determined that the vehicle is allowed to travel.

6. The vehicle management method for low-temperature and low-power vehicle conditions according to claim 2, wherein: When it is determined that the vehicle is allowed to travel, the vehicle driving torque is not limited; When it is determined that the vehicle is not allowed to travel, the vehicle driving torque is limited, and it is determined whether to resume vehicle travel; If the vehicle travel is resumed, the vehicle driving torque is not limited, and if the vehicle travel is not resumed, the vehicle driving torque continues to be limited.

7. The vehicle management method for low-temperature and low-power vehicle conditions according to claim 6, wherein: The determination of whether to resume vehicle travel includes: Obtaining a real-time battery state of the power battery; the real-time battery state includes a real-time battery temperature, a real-time battery power, and a real-time allowed charging power; Obtaining a vehicle navigation state, and when the user starts navigation, obtaining a predicted travel distance and a predicted travel time; Obtaining vehicle energy consumption information, and determining a predicted travel power consumption based on the vehicle energy consumption information, the predicted travel distance, and the predicted travel time; Based on the real-time battery temperature, the real-time battery power, the real-time allowed charging power, the predicted travel power consumption, a preset temperature threshold, a preset power threshold, and the estimated consumption power, it is determined whether to resume vehicle travel.

8. The vehicle management method for low-temperature and low-power vehicle conditions according to claim 7, wherein: If the real-time battery temperature is not less than the preset temperature threshold, the real-time battery power is not less than the estimated consumption power, the real-time allowed charging power is not less than the preset power threshold, or the predicted travel power consumption is not greater than the estimated consumption power, it is determined that the vehicle travel is resumed; Otherwise, it is determined that the vehicle travel is not resumed.

9. A vehicle characterized by: The vehicle management method for low-temperature and low-power vehicle conditions according to any one of claims 1-8.

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