CN115447513B - Temperature and voltage-based storage battery power shortage prevention system, method and vehicle - Google Patents
Temperature and voltage-based storage battery power shortage prevention system, method and vehicle Download PDFInfo
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- CN115447513B CN115447513B CN202211202322.5A CN202211202322A CN115447513B CN 115447513 B CN115447513 B CN 115447513B CN 202211202322 A CN202211202322 A CN 202211202322A CN 115447513 B CN115447513 B CN 115447513B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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Abstract
The invention discloses a temperature and voltage-based storage battery power shortage prevention system, a temperature and voltage-based storage battery power shortage prevention method and a vehicle, wherein whether the storage battery needs to be supplemented with power or not is judged by utilizing a T-BOX, the whole vehicle is not required to be awakened when the storage battery needs to be supplemented with power, and the whole vehicle is not required to be awakened when the storage battery does not need to be supplemented with power, so that the consumption of the whole vehicle on the electric quantity of the storage battery due to awakening of the whole vehicle can be reduced, and the risk of power shortage of the storage battery is reduced; when judging whether the storage battery needs to be charged, the influence of the ambient temperature is considered, so that the judgment of whether the storage battery needs to be charged is more in line with the actual application scene of the vehicle, and the judgment of whether the storage battery needs to be charged is more accurate, and the long-term electricity utilization of the storage battery is more effectively ensured.
Description
Technical Field
The invention belongs to the field of automobile storage battery control, and particularly relates to a storage battery power shortage prevention system and method based on temperature and voltage and a vehicle.
Background
The storage battery has the following functions: (1) When the vehicle is started, a continuous 12V starting power supply is provided for high voltage on the whole vehicle; (2) After the vehicle is started, when the power consumption requirement of the vehicle exceeds the power output by the DCDC converter (or the generator), the storage battery can provide short-time continuous current for the whole vehicle; (3) When the vehicle is not started, 12V working power supply is continuously provided for low-voltage loads on the vehicle for a short time.
The battery is deficient in electricity, which can cause the voltage of the whole vehicle to be too low, the function to be disturbed, and even the vehicle cannot be started. When the vehicle is in a standing state for too long, the phenomenon of battery power shortage is easy to occur; when the using frequency of the vehicle is too low, the vehicle charges the storage battery less, and the whole vehicle is in power consumption at the same time, so that the condition of power deficiency easily occurs as soon as the time is long; when the air temperature in the north of winter becomes cold, the voltage corresponding to the SOC can be reduced along with the reduction of the temperature due to the characteristics of the storage battery, so that the probability of power shortage can be increased.
In the traditional design, the storage battery only charges the storage battery through the DCDC converter (or the generator) after the vehicle is started, and meanwhile, a continuous power supply is provided for a low-voltage power utilization system of the whole vehicle, but the function of actively compensating the storage battery during the static discharging period of the vehicle cannot be realized.
At present, the existing storage battery power shortage prevention system (namely an intelligent power supply system) in the market needs a vehicle-mounted storage battery sensor for more than 95%, and the cost is high.
CN112895977a discloses an intelligent power supplementing method for an automobile starting power supply, which does not adopt a storage battery sensor, but still has the following problems: (1) The power supply efficiency is extremely low, and the power supply is inaccurate, but the power supply is not performed in many scenes needing the power supply; (2) When the fixed time is adopted for awakening, if the electric quantity of the storage battery is found to be sufficient after the awakening, the electric quantity of the storage battery is wasted, and the risk of power shortage is increased; (3) The fixed time is adopted for waking up, the environment temperature is not considered, and the situation that the vehicle is already lack of power and the storage battery is not timely woken up to supply power can possibly occur, so that the use of the vehicle is affected.
Disclosure of Invention
The invention aims to provide a temperature and voltage-based storage battery power shortage prevention system, a temperature and voltage-based storage battery power shortage prevention method and a vehicle, so that long-term power existence of the storage battery is ensured more effectively, the power shortage condition is avoided, and meanwhile, the cost is reduced.
The invention relates to a temperature and voltage-based storage battery power shortage prevention system, which comprises a vehicle body controller, a T-BOX, a battery management system and a power control unit, wherein the T-BOX, the battery management system and the power control unit are in communication connection with the vehicle body controller, a DCDC converter is connected with the power control unit and the storage battery, and a relay is connected between the power battery and the DCDC converter at a controlled end, and the control end is connected with the battery management system; the battery management system is connected with the power battery. The storage battery power shortage prevention system also comprises an ambient temperature sensor, wherein the T-BOX is connected with the ambient temperature sensor to collect the ambient temperature; the T-BOX is connected with the storage battery, and the voltage of the storage battery is collected. The power control unit is mainly responsible for requesting the battery management system to control the relay to be closed and opened, and controlling the output voltage of the DCDC converter (namely, converting high-voltage power into low-voltage power) to supplement power for the storage battery. The battery management system is mainly responsible for controlling the closing and opening of the relay to realize high-voltage power-on or high-voltage power-off, and meanwhile, the current residual electric quantity of the power battery CAN be sent to the CAN bus.
The vehicle comprises the storage battery power shortage prevention system based on temperature and voltage.
The invention relates to a method for preventing battery from being deficient based on temperature and voltage, which adopts the battery power shortage prevention system, and comprises the following steps:
Under the condition that the battery power shortage prevention function is started, triggering the battery power shortage prevention function when the whole vehicle is in a dormant state, collecting the current environment temperature and the current battery voltage after the T-BOX is periodically awakened, determining a power supply voltage threshold corresponding to the current environment temperature, judging that the battery needs power supply if the current battery voltage is smaller than or equal to the power supply voltage threshold corresponding to the current environment temperature, and awakening the whole vehicle.
After the whole vehicle wakes up, the T-BOX judges whether the current residual electric quantity of the power battery is larger than a preset SOC threshold value, if so, the T-BOX sends a power supplementing request and a power supplementing time length request value to the vehicle body controller, the vehicle body controller carries out starting condition judgment after receiving the power supplementing request, if not meeting the starting condition, the vehicle body controller exits the storage battery power shortage prevention function, if meeting the starting condition, the vehicle body controller sends a high-voltage request to the power control unit, and after the power control unit receives the high-voltage request, the power control unit requests the battery management system to control the relay to be closed, the high-voltage power is supplied, and the output voltage of the DCDC converter (namely the high-voltage is converted into the low-voltage power) is controlled to supplement the storage battery.
In the process of supplementing electricity for the storage battery, when the exiting condition of the storage battery power-fail-safe function is met, the storage battery power-fail-safe function is exited, when the exiting condition of the storage battery power-fail-safe function is met, the vehicle body controller sends a high-voltage down request to the power control unit, and after the power control unit receives the high-voltage down request, the power control unit requests the battery management system to control the relay to be disconnected, the high-voltage down is carried out, and the whole vehicle is dormant.
Preferably, the mode of determining the power up voltage threshold corresponding to the current ambient temperature is: firstly converting the current environmental temperature into a standard temperature, and then inquiring a preset voltage threshold value table by utilizing the standard temperature to obtain a power supply voltage threshold value corresponding to the current environmental temperature; the preset voltage threshold table is a corresponding relation table of the ambient temperature and the power supply voltage threshold when the electric quantity of the storage battery obtained through calibration is Q TBD, and Q TBD represents a preset residual electric quantity threshold of the storage battery. The power-supplementing voltage threshold is not a fixed value, but a value related to the current ambient temperature, so that the judgment of whether the storage battery needs power supplement is more in line with the actual application scene of the vehicle, and the judgment of whether the storage battery needs power supplement is more accurate. Because if the same fixed power supply voltage threshold value is used in winter (lower than-10 ℃) and normal temperature (such as 25 ℃) in the north, electric energy waste caused by that the storage battery does not need to be supplied with power and the whole vehicle is awakened to be supplied with power can occur, and electric energy loss of the storage battery caused by that the storage battery needs to be supplied with power and the whole vehicle is not awakened to be supplied with power can also occur.
Preferably, the mode of converting the current ambient temperature into the standard temperature is as follows:
If the current ambient temperature is equal to T ', the standard temperature is made equal to the current ambient temperature (also equal to T').
If the absolute value of the difference between the current ambient temperature and T 'is greater than or equal to 5 ℃ and less than 10 ℃, the standard temperature is made equal to T' +10 ℃.
If the absolute value of the difference between the current ambient temperature and T 'is less than 5 ℃, the standard temperature is made equal to T'.
Wherein T' represents any one of the environmental temperatures in the preset voltage threshold table.
Preferably, the timing time T h of the self-wake-up of the T-BOX timing is obtained by the following steps:
the T-BOX firstly determines an SOC calibration value Q of the storage battery according to the environmental temperature and the storage battery voltage which are acquired last time before dormancy;
T-BOX reuse formula: the timing time t h is calculated.
Wherein, C represents the preset storage battery capacity, I represents the preset whole vehicle current from CAN network dormancy to the state before the whole vehicle enters into deep dormancy, t represents the preset time from CAN network dormancy to the state of deep dormancy, P represents the preset static power consumption, LR represents the self-loss rate caused by the self-discharge of the preset storage battery.
The timing time T h of the T-BOX timing self-awakening is not a fixed value, but is a value related to the environmental temperature and the storage battery voltage acquired last time before the T-BOX dormancy, so that the timing time of the T-BOX timing self-awakening is more in line with the actual application scene of a vehicle.
Preferably, the preset remaining battery power threshold value Q TBD =30%. And when the residual electric quantity of the storage battery is 30%, the storage battery is charged, and the whole vehicle has the minimum energy consumption. Because the vehicle is in a high-voltage state and takes the DCDC converter as a power supply, the voltage basically has no fluctuation, and the voltage value output by the DCDC converter is constant under the scene that the same vehicle type and the storage battery power shortage prevention function is started, the lower the combined SOC is, the larger the early charging current is, and the higher the charging efficiency is; the battery is charged optimally when the remaining capacity of the battery is 30%.
Preferably, the method for determining the SOC calibration value Q of the storage battery by the T-BOX according to the last acquired ambient temperature and the storage battery voltage before dormancy is as follows:
the last acquired ambient temperature before dormancy is converted into table look-up temperature.
And then, converting the last acquired storage battery voltage before dormancy into a table look-up voltage.
Finally, inquiring a preset SOC calibration value table by using the table lookup temperature and the table lookup voltage to obtain a corresponding SOC calibration value Q of the storage battery; the preset SOC calibration value table is a corresponding relation table of the ambient temperature, the storage battery voltage and the SOC calibration value obtained through calibration.
Preferably, the mode of converting the last acquired ambient temperature before dormancy into the table look-up temperature is as follows:
if the last acquired ambient temperature before dormancy is equal to T, the lookup temperature is made equal to the last acquired ambient temperature before dormancy (also equal to T).
If the absolute value of the difference between the last acquired ambient temperature before dormancy and T is greater than or equal to 5 ℃ and less than 10 ℃, the lookup temperature is equal to T+10℃.
If the absolute value of the difference between the last acquired ambient temperature before dormancy and T is less than 5 ℃, the table look-up temperature is equal to T.
Wherein T represents any one of the environmental temperatures in the preset SOC calibration value table.
Preferably, the method for processing the last acquired storage battery voltage before dormancy into the table look-up voltage is as follows:
If the last acquired battery voltage before dormancy is equal to Vfx, the table lookup voltage is made equal to the last acquired battery voltage before dormancy (also equal to Vfx); wherein Vfx represents any one of the battery voltages corresponding to the table lookup temperature in the preset SOC calibration value table.
If the last acquired battery voltage before dormancy is between Vfy and Vfz, the table lookup voltage is equal to Vfz; and the Vfy and the Vfz represent the voltages of two adjacent storage batteries corresponding to the table lookup temperature in a preset SOC calibration value table, and the Vfy is smaller than Vfz.
Preferably, if the conditions 1a to 1c are satisfied at the same time, it means that the start-up condition is satisfied. Wherein, condition 1a is: the gear of the whole vehicle power supply is an OFF gear; condition 1b is: the whole vehicle is in a fortification state; condition 1c is: there is no fault that inhibits high voltage power up.
Preferably, if either one of the conditions 2a, 2b is satisfied, it indicates that the battery power shortage prevention function exit condition is satisfied. Wherein, condition 2a is: the power supply gear of the whole vehicle is a non-OFF gear; condition 2b is: a user remote control vehicle command (such as a remote start air conditioning command, a remote seat heating command, etc.) is detected.
Preferably, if any one of the conditions 3a to 3e is satisfied, it indicates that the battery charging exit condition is satisfied. Wherein, the condition 3a is: the current residual electric quantity of the power battery is smaller than a preset SOC threshold value; condition 3b is: there is a fault requiring high voltage reduction; condition 3c is: the power-up time length is greater than or equal to the power-up time length request value; condition 3d is: detecting an illegal intrusion vehicle signal; condition 3e is: and (5) solving the protection of the whole vehicle.
Preferably, the preset SOC threshold value is 30%, and the power-up duration request value is 20min. As the charge amount of the battery increases, the charge current of the battery decreases and the charge efficiency decreases due to the characteristics of the battery. Therefore, the battery is charged in a period of time in which the charging efficiency is highest; the electric quantity that the battery needs to be charged not only needs to avoid short time but also generates insufficient power, and the waste caused by excessive charging is prevented. It is important to select an appropriate power up duration request value. The experiment shows that: the lower the battery SOC (electric quantity) is, the larger the early charging current is, and the charging current tends to be the same along with the progress of charging; under the same storage battery SOC, the higher the charging voltage is, the larger the early charging current is, and the charging current tends to be the same along with the progress of charging; the slope of each curve changes little about 20 minutes before the first, indicating that the charging efficiency is high without degradation. At 40min, the slope of the curve is already relatively gentle. The experimental conclusion shows that the battery is most efficient in the first 20 minutes of charging, if the battery is the same type, at any vehicle, at any ambient temperature and at any battery SOC. In summary, the power-up time period request value is taken as 20min.
The invention has the following effects:
(1) The problem that the whole vehicle cannot be started after the whole vehicle is lack of power caused by long-time parking or low use frequency of the vehicle is solved, and various intelligent functions can be continuously used during parking of the vehicle.
(2) And a vehicle-mounted storage battery sensor is omitted, so that the cost is reduced.
(3) The T-BOX is utilized to judge whether the storage battery needs to be charged, the whole vehicle is awakened when the storage battery needs to be charged, and the whole vehicle is not required to be awakened when the storage battery does not need to be charged, so that the consumption of the electric quantity of the storage battery caused by the whole vehicle awakening is reduced, and the risk of power shortage of the storage battery is reduced.
(4) When judging whether the storage battery needs to be charged, the influence of the ambient temperature is considered, so that the judgment of whether the storage battery needs to be charged is more in line with the actual application scene of the vehicle, the judgment of whether the storage battery needs to be charged is more accurate, and the long-term electricity utilization of the storage battery is more effectively ensured.
(5) The method comprises the steps of taking the current residual electric quantity of the power battery as a precondition that a T-BOX sends a power supply request and a power supply time request value to a vehicle body controller, and exiting power supply when the current residual electric quantity of the power battery is smaller than the preset SOC threshold value, wherein the condition is favorable for ensuring that the power battery has enough energy to meet the power supply requirement of a storage battery, and the condition that the electric quantity of the power battery is exhausted for supplying power to the storage battery is effectively avoided.
(6) The timing time of the T-BOX timing self-awakening is related to the ambient temperature and the voltage of the storage battery, so that the consumption of partial electricity of the storage battery caused by frequent awakening of the T-BOX is effectively avoided, the detection requirement of preventing the occurrence of power shortage is met, and the detection can be performed by timely awakening.
Drawings
Fig. 1 is a schematic diagram of a battery power shortage prevention system based on temperature and voltage in the present embodiment.
Fig. 2 is a flowchart of a method for preventing battery power shortage based on temperature and voltage in the present embodiment.
Fig. 3 is a graph of experimental data on SOC calibration values, battery voltages, and ambient temperatures (20 ℃, -10 ℃) obtained by performing calibration experiments using the battery in this example.
Fig. 4 is a graph showing the relationship between different SOC values and different charge voltages and charge amounts of the battery in a20 ℃ environment obtained by performing a verification experiment using the battery in this example.
Detailed Description
As shown in fig. 1, the battery power shortage prevention system based on temperature and voltage in this embodiment includes a T-BOX1, a body controller (i.e., BCM) 2, a battery management system (i.e., BMS) 3, a power control unit (i.e., PCU) 4, a DCDC converter 5, an ambient temperature sensor 6, a relay 7, and a gateway 8,T-BOX 1, the body controller 2, the battery management system 3, and the power control unit 4 implement CAN communication connection through the gateway 8, the power control unit 4 is connected with the DCDC converter 5, the DCDC converter 5 is connected with the battery, a controlled end of the relay 7 is connected between the power battery and the DCDC converter 5, a control end of the relay 7 is connected with the battery management system 3, and the battery management system 3 is connected with the power battery. The T-BOX1 is connected with an ambient temperature sensor 6 to collect the ambient temperature; the T-BOX1 is connected with a storage battery, and the voltage of the storage battery is collected.
According to the temperature and voltage-based storage battery power shortage prevention method, the temperature and voltage-based storage battery power shortage prevention system is adopted, and when a storage battery power shortage prevention function is started (the storage battery power shortage prevention system can be started at a vehicle end or a mobile phone end, after the storage battery power shortage prevention function is started, and before the next vehicle end or the mobile phone end is closed, the storage battery power shortage prevention function is always in a starting state), the whole vehicle is set to enter a dormant state.
As shown in fig. 2, the method includes:
And S1, self-waking up the T-BOX 1 at a fixed time, collecting the current environment temperature and the current storage battery voltage after self-waking up, and then executing step S2. After the self-awakening, the current environment temperature and the current storage battery voltage can be acquired after waiting for 1s, so that the influence of voltage fluctuation is reduced.
The timing time T h (unit: day) of the T-BOX 1 timing self-wakeup is obtained by:
And in the first step, the T-BOX 1 determines an SOC calibration value Q of the storage battery according to the last acquired ambient temperature and the storage battery voltage before dormancy. The method specifically comprises the following steps:
Firstly, the last acquired ambient temperature before dormancy is converted into table look-up temperature.
The specific method is as follows: if the last acquired ambient temperature before dormancy is equal to T, the table look-up temperature is made equal to the last acquired ambient temperature before dormancy (also equal to T); if the absolute value of the difference between the ambient temperature and T acquired last time before dormancy is greater than or equal to 5 ℃ and less than 10 ℃, the table lookup temperature is enabled to be equal to T+10 ℃; if the absolute value of the difference between the ambient temperature acquired last time before dormancy and T is smaller than 5 ℃, the table lookup temperature is enabled to be equal to T; wherein T represents any one of the environmental temperatures in the preset SOC calibration value table.
And then, converting the last acquired storage battery voltage before dormancy into a table look-up voltage.
The specific method is as follows: if the last acquired battery voltage before dormancy is equal to Vfx, the table lookup voltage is made equal to the last acquired battery voltage before dormancy (also equal to Vfx); wherein Vfx represents any one storage battery voltage corresponding to the table lookup temperature obtained in the last step in a preset SOC calibration value table; if the last acquired battery voltage before dormancy is between Vfy and Vfz, the table lookup voltage is equal to Vfz; and the Vfy and the Vfz represent adjacent two storage battery voltages corresponding to the table lookup temperature obtained in the last step in a preset SOC calibration value table, and the Vfy is smaller than Vfz.
Finally, inquiring a preset SOC calibration value table by using the table lookup temperature and the table lookup voltage to obtain a corresponding SOC calibration value Q of the storage battery; the preset SOC calibration value table is a corresponding relationship table of the ambient temperature, the battery voltage and the SOC calibration value obtained through calibration (see table 1). By setting different ambient temperatures (such as-30 ℃, -20 ℃, -10 ℃,0 ℃, 10 ℃,20 ℃ and 30 ℃) in the environmental chamber, corresponding battery voltages with the battery power of 1% -100% are collected to form the table 1.
TABLE 1
For example, the last collected ambient temperature before dormancy is 10 ℃, and the table look-up temperature is 10 ℃; the last collected ambient temperature before dormancy is 22 ℃, and the table lookup temperature is 20 ℃; the last ambient temperature collected before dormancy was 26 ℃, and the lookup temperature was 30 ℃. If the last collected ambient temperature before dormancy is 22 ℃ and the voltage of the storage battery is equal to Vf11, the lookup temperature is 20 ℃, the lookup voltage is Vf11, and the SOC calibration value q=98% of the storage battery obtained by lookup. If the last collected ambient temperature before dormancy is 22 ℃, and the voltage of the storage battery is greater than Vf13 and less than Vf12, the lookup temperature is 20 ℃, the lookup voltage is Vf12, and the SOC calibration value q=32% of the storage battery obtained by lookup.
Fig. 3 also shows experimental data curves for partial SOC calibration (30% -100%), battery voltage, ambient temperature at ambient temperature of 20 ℃, -10 ℃.
The second step, T-BOX 1, uses the formula: the timing time t h (unit: day) was calculated.
Wherein, Q TBD represents a preset remaining capacity threshold of the storage battery, that is, a remaining capacity threshold that needs to be charged without affecting the working and performance life of the storage battery. In this example, the value is 30%, i.e., Q TBD =30%.
C represents a preset battery capacity, and the typical vehicle model is 45Ah, 52Ah or 60Ah. In this example 60Ah is selected, i.e. c=60 Ah.
I represents the preset current of the whole vehicle from CAN network dormancy to the state before the whole vehicle enters deep dormancy. In this embodiment, the value is 3A, i.e. i=3a.
T represents the preset time from CAN network dormancy to the time when the whole vehicle enters a deep dormancy state. In this embodiment, the value is 10min, i.e., t=10min.
P represents a preset static power consumption. The static power consumption is the dark current consumption of the whole vehicle after entering into deep sleep, and the standard of a general host factory is lower than 20mA/h. In this example, the value was 20mA/h, i.e., P=20mA/h.
LR represents a self-loss rate caused by self-discharge of the preset battery, and its value is related to the type of the battery, in this embodiment lr=1.7%o.
Step S2, T-BOX 1 determines a power-up voltage threshold corresponding to the current ambient temperature, and then step S3 is executed.
The method for determining the power-up voltage threshold corresponding to the current environment temperature is as follows:
The current ambient temperature is first converted to a standard temperature.
The specific method is as follows: if the current ambient temperature is equal to T ', the standard temperature is made equal to the current ambient temperature (also equal to T'). If the absolute value of the difference between the current ambient temperature and T 'is greater than or equal to 5 ℃ and less than 10 ℃, the standard temperature is made equal to T' +10 ℃, and if the absolute value of the difference between the current ambient temperature and T 'is less than 5 ℃, the standard temperature is made equal to T'. Wherein T' represents any one of the environmental temperatures in the preset voltage threshold table.
And then, inquiring a preset voltage threshold value table by using the standard temperature to obtain a power supply voltage threshold value corresponding to the current environment temperature.
The preset voltage threshold value table is a corresponding relation table of the ambient temperature and the power-supplementing voltage threshold value when the electric quantity of the storage battery obtained through calibration is Q TBD. For example, in this embodiment, when the ambient temperature is 12 ℃, the standard temperature is 10 ℃, and the power supply voltage threshold obtained by table lookup is Vf22; when the ambient temperature is-10 ℃, the standard temperature is-10 ℃, and the power supply voltage threshold value obtained by table lookup is Vf38; when the ambient temperature is 26 ℃, the standard temperature is 30 ℃, and the power supply voltage threshold value obtained by table lookup is Vf6.
And step S3, the T-BOX 1 judges whether the current storage battery voltage is smaller than or equal to a power supply voltage threshold value corresponding to the current environment temperature, if so, the step S5 is executed, and otherwise, the step S4 is executed.
Step S4, the T-BOX 1 is dormant, and then the step S1 is executed in a returning mode.
And S5, the T-BOX 1 judges that the storage battery needs to be charged, wakes up the whole vehicle, and then executes the step S6.
Step S6, after the whole vehicle wakes up, the T-BOX 1 determines whether the current remaining capacity of the power battery is greater than 30% (i.e. the SOC threshold value preset in the embodiment=30%), if yes, step S8 is executed, otherwise step S7 is executed.
And S7, the whole vehicle is dormant, and then the step S1 is executed.
Step S8, the T-BOX 1 sends a power replenishment request and a power replenishment time period request value to the vehicle body controller 2, and then step S9 is executed. The power-up time period request value in this embodiment is 20 minutes.
Under the condition that the charging voltages are 14.4V, 14.1V and 13.8V, a charging experiment is carried out by using (the same type of) storage batteries with the electric quantity of 30%, 50% and 70%, sample data are collected, and a charging curve of the storage batteries is drawn (see fig. 4).
As can be seen from fig. 4: at the same charging voltage, the lower the SOC of the storage battery is, the larger the early charging current is, and the charging current tends to be the same along with the progress of charging; under the same storage battery SOC, the higher the charging voltage is, the larger the early charging current is, and the charging current tends to be the same along with the progress of charging; the slope of each curve changes little about 20 minutes before the first, indicating that the charging efficiency is high without degradation. At 40min, the slope of the curve is already relatively gentle. The experimental conclusion shows that the battery is most efficient in the first 20 minutes of charging, if the battery is the same type, at any vehicle, at any ambient temperature and at any battery SOC. And the storage battery with 30% of SOC (namely, the storage battery with 30% of SOC value when starting to charge) is charged with 24Ah in 20 minutes, and is charged to be close to 42%, so that the power supplementing requirement of the whole vehicle is met.
Step S9, after receiving the power-up request, the vehicle body controller 2 judges whether the starting condition is met, if yes, the step S10 is executed, and if not, the step S17 is executed. Wherein if the conditions 1a to 1c are satisfied at the same time, it means that the start condition is satisfied. Condition 1a is: the gear of the whole vehicle power supply is an OFF gear; condition 1b is: the whole vehicle is in a fortification state; condition 1c is: there is no fault that inhibits high voltage power up.
Step S10, the body controller 2 sends an upper high pressure request to the power control unit 4, and then step S11 is performed.
Step S11, after the power control unit 4 receives the request for the high voltage, the battery management system 3 is requested to control the relay 7 to be closed, the high voltage is powered on, and then step S12 is executed.
Step S12, the power control unit 4 controls the DCDC converter 5 to output voltage (i.e. convert high voltage power into low voltage power) to supplement power to the storage battery, and then step S13 is performed.
Step S13, the vehicle body controller 2 determines whether the battery power shortage prevention function exit condition is satisfied, if yes, step S17 is executed, otherwise step S14 is executed. Wherein, if either one of the conditions 2a, 2b is satisfied, it indicates that the battery power shortage prevention function exit condition is satisfied. Condition 2a is: the power supply gear of the whole vehicle is a non-OFF gear; condition 2b is: a user remote control vehicle command (such as a remote start air conditioning command, a remote seat heating command, etc.) is detected.
Step S14, the vehicle body controller 2 determines whether the battery power-up exit condition is satisfied, if yes, step S15 is executed, otherwise, step S12 is executed again. If any one of the conditions 3a to 3e is satisfied, the condition indicates that the battery charging exit condition is satisfied. Condition 3a is: the current residual electric quantity of the power battery is less than 30%; condition 3b is: there is a fault requiring high voltage reduction;
Condition 3c is: the power supply time is longer than or equal to 20min; condition 3d is: detecting an illegal intrusion vehicle signal; condition 3e is: and (5) solving the protection of the whole vehicle.
Step S15, the vehicle body controller 2 sends a request for a low-high pressure to the power control unit 4, and then executes step S16.
And S16, after receiving the high-voltage request, the power control unit 4 requests the battery management system 3 to control the relay 7 to be disconnected, the high-voltage is applied, the whole vehicle is dormant, and then the operation is finished.
And step S17, exiting the function of preventing the battery from losing power, and ending.
In the process of supplementing electricity for the storage battery, the central control liquid crystal screen and the instrument display screen can be black, can not be lightened and can not display any information, the work indication on the central control panel can not be lightened, the work indication lamp has no indication function, and the key adjusting function on the central control panel can be forbidden, so that the energy consumption can be saved.
The embodiment also provides a vehicle, which comprises the storage battery power shortage prevention system based on temperature and voltage.
Claims (10)
1. The method for preventing the power shortage of the storage battery based on the temperature and the voltage is characterized in that the adopted system for preventing the power shortage of the storage battery comprises the following steps: a vehicle body controller (2), an ambient temperature sensor (6), a T-BOX (1) which is in communication connection with the vehicle body controller (2) through a gateway (8), a battery management system (3) and a power control unit (4), a DCDC converter (5) which is connected with the power control unit (4) and a storage battery, and a relay (7) of which the controlled end is connected between the power battery and the DCDC converter (5) and the control end is connected with the battery management system (3); the battery management system (3) is connected with the power battery; the T-BOX (1) is connected with the ambient temperature sensor (6) to collect the ambient temperature; the T-BOX (1) is connected with a storage battery, and the voltage of the storage battery is collected; the method comprises the following steps:
Under the condition that the battery power shortage prevention function is started, triggering the battery power shortage prevention function when the whole vehicle is set to enter a dormant state, acquiring the current environment temperature and the current battery voltage after the T-BOX (1) is self-awakened at fixed time, determining a power supply voltage threshold corresponding to the current environment temperature, judging that the battery needs power supply if the current battery voltage is smaller than or equal to the power supply voltage threshold corresponding to the current environment temperature, and awakening the whole vehicle;
After the whole vehicle wakes up, the T-BOX (1) judges whether the current residual electric quantity of the power battery is larger than a preset SOC threshold value, if so, the T-BOX (1) sends a power-supplementing request and a power-supplementing time length request value to the vehicle body controller (2), the vehicle body controller (2) judges starting conditions after receiving the power-supplementing request, if not, the storage battery power-shortage prevention function is exited, if the starting conditions are met, the vehicle body controller (2) sends an upper high-voltage request to the power control unit (4), and after the power control unit (4) receives the upper high-voltage request, the battery management system (3) is requested to control the relay (7) to be closed, the high-voltage power-up is performed, and the output voltage of the DCDC converter (5) is controlled to supplement the storage battery power;
In the process of supplementing electricity to the storage battery, when the exiting condition of the storage battery power-fail-safe function is met, the storage battery power-fail-safe function is exited, and when the exiting condition of the storage battery power-fail-safe function is met, the vehicle body controller (2) sends a high-voltage down request to the power control unit (4), and after the power control unit (4) receives the high-voltage down request, the battery management system (3) is requested to control the relay (7) to be disconnected, the high-voltage power is reduced, and the whole vehicle is dormant;
The timing time T h of the self-wake-up of the T-BOX (1) is obtained by the following steps:
the T-BOX (1) firstly determines an SOC calibration value Q of the storage battery according to the last acquired ambient temperature and the storage battery voltage before dormancy;
T-BOX (1) reuse formula: Calculating the timing time t h;
Wherein, C represents preset storage battery capacity, I represents preset whole vehicle current from CAN network dormancy to before the whole vehicle enters a deep dormancy state, t represents preset time required from CAN network dormancy to the whole vehicle enters the deep dormancy state, P represents preset static power consumption, LR represents preset self-loss rate caused by self-discharge of the storage battery, and Q TBD represents preset storage battery residual electric quantity threshold.
2. The method for preventing power shortage of a battery based on temperature and voltage according to claim 1, characterized in that:
The method for determining the power-up voltage threshold corresponding to the current environment temperature is as follows: firstly converting the current environmental temperature into a standard temperature, and then inquiring a preset voltage threshold value table by utilizing the standard temperature to obtain a power supply voltage threshold value corresponding to the current environmental temperature; the preset voltage threshold table is a corresponding relation table of the ambient temperature and the power-supplementing voltage threshold value when the electric quantity of the storage battery obtained through calibration is Q TBD.
3. The temperature and voltage based battery de-energizing method of claim 2, wherein:
the mode of converting the current ambient temperature to the standard temperature is:
If the current ambient temperature is equal to T', making the standard temperature equal to the current ambient temperature;
if the absolute value of the difference between the current ambient temperature and T 'is greater than or equal to 5 ℃ and less than 10 ℃, the standard temperature is made equal to T' +10 ℃;
If the absolute value of the difference between the current ambient temperature and T 'is less than 5 ℃, making the standard temperature equal to T';
Wherein T' represents any one of the environmental temperatures in the preset voltage threshold table.
4. The method for preventing power shortage of a battery based on temperature and voltage according to claim 1, characterized in that: the preset remaining battery capacity threshold value Q TBD =30%.
5. The method for preventing power shortage of a battery based on temperature and voltage according to claim 1, characterized in that:
The method for determining the SOC calibration value Q of the storage battery by the T-BOX (1) according to the last acquired ambient temperature and the storage battery voltage before dormancy is as follows:
Firstly, converting the environmental temperature acquired last time before dormancy into table look-up temperature;
then, converting the last acquired storage battery voltage before dormancy into table lookup voltage;
Finally, inquiring a preset SOC calibration value table by using the table lookup temperature and the table lookup voltage to obtain a corresponding SOC calibration value Q of the storage battery; the preset SOC calibration value table is a corresponding relation table of the ambient temperature, the storage battery voltage and the SOC calibration value obtained through calibration.
6. The method for preventing power shortage of a battery based on temperature and voltage according to claim 5, characterized in that:
the mode of converting the last acquired ambient temperature before dormancy into the table look-up temperature is as follows:
If the last acquired ambient temperature before dormancy is equal to T, the table look-up temperature is made equal to the last acquired ambient temperature before dormancy;
if the absolute value of the difference between the ambient temperature and T acquired last time before dormancy is greater than or equal to 5 ℃ and less than 10 ℃, the table lookup temperature is enabled to be equal to T+10 ℃;
If the absolute value of the difference between the ambient temperature acquired last time before dormancy and T is smaller than 5 ℃, the table lookup temperature is enabled to be equal to T;
wherein T represents any one of the environmental temperatures in the preset SOC calibration value table.
7. The method for preventing power shortage of a battery based on temperature and voltage according to claim 6, characterized in that:
The method for processing the last acquired storage battery voltage before dormancy into the table look-up voltage is as follows:
If the last acquired battery voltage before dormancy is equal to Vfx, the table lookup voltage is made to be equal to the last acquired battery voltage before dormancy; wherein Vfx represents any one storage battery voltage corresponding to the table lookup temperature in a preset SOC calibration value table;
If the last acquired battery voltage before dormancy is between Vfy and Vfz, the table lookup voltage is equal to Vfz; and the Vfy and the Vfz represent the voltages of two adjacent storage batteries corresponding to the table lookup temperature in a preset SOC calibration value table, and the Vfy is smaller than Vfz.
8. The method for preventing power shortage of a battery based on temperature and voltage according to any one of claims 1 to 7, characterized in that:
if the conditions 1 a-1 c are satisfied at the same time, the starting condition is satisfied; wherein,
Condition 1a is: the gear of the whole vehicle power supply is an OFF gear;
condition 1b is: the whole vehicle is in a fortification state;
Condition 1c is: failure to inhibit high voltage power up;
if either one of the conditions 2a and 2b is met, the condition that the function of preventing the storage battery from losing electricity is withdrawn is met; wherein,
Condition 2a is: the power supply gear of the whole vehicle is a non-OFF gear;
Condition 2b is: detecting a remote control vehicle instruction of a user;
if any one of the conditions 3a to 3e is satisfied, the condition that the battery is charged out is satisfied; wherein,
Condition 3a is: the current residual electric quantity of the power battery is smaller than a preset SOC threshold value;
Condition 3b is: there is a fault requiring high voltage reduction;
condition 3c is: the power-up time length is greater than or equal to the power-up time length request value;
Condition 3d is: detecting an illegal intrusion vehicle signal;
Condition 3e is: and (5) solving the protection of the whole vehicle.
9. The method for preventing power shortage of a battery based on temperature and voltage according to any one of claims 1 to 7, characterized in that: and the power-up time period request value is 20min.
10. The method for preventing power shortage of a battery based on temperature and voltage according to claim 8, characterized in that: the preset SOC threshold is 30%, and the power-up time period request value is 20min.
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