A driving heating control method and device

Abstract

The present invention provides a driving heating control method and device, wherein the method comprises: obtaining the current ambient temperature during driving; determining the power battery capacity attenuation ratio corresponding to the current ambient temperature according to a preset relationship; wherein the preset relationship represents the relationship between the ambient temperature and the battery capacity attenuation ratio; determining the target battery capacity for starting driving heating according to the power battery capacity attenuation ratio; and starting driving heating when the remaining battery capacity of the power battery of the electric vehicle is the target battery capacity. According to the preset relationship, different power battery capacity attenuation ratios can be obtained at different ambient temperatures, and further, the target battery capacity when driving heating is turned on can be obtained according to the attenuation ratio. By dynamically adjusting the start point of driving heating in combination with the ambient temperature, the target battery capacity when driving heating is turned on corresponding to the ambient temperature can be more accurately determined.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicles, and in particular to a driving heating control method and device. Background Art

[0002] As we all know, power batteries, as the power source of new energy vehicles, are greatly affected by ambient temperature. When the ambient temperature is below 0°C, the battery capacity of the power battery decays significantly. In order to ensure the cruising range of new energy vehicles, the power battery is generally heated. However, multiple factors such as battery temperature capacity decay, ambient temperature, battery remaining power percentage (State Of Charge, SOC) error, heating rate, etc. will affect the judgment of heating the power battery. How to accurately control the heating of the power battery during driving needs to be considered. Summary of the invention

[0003] The object of the present invention is to provide a driving heating control method and device to solve the problem in the prior art that the heating of the power battery cannot be accurately controlled during driving.

[0004] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a driving heating control method, which is applied to an electric vehicle, including: obtaining the current ambient temperature during driving; determining the power battery capacity attenuation ratio corresponding to the current ambient temperature according to a preset relationship; wherein the preset relationship represents the relationship between the ambient temperature and the battery capacity attenuation ratio; determining the target battery capacity for starting driving heating according to the power battery capacity attenuation ratio; and starting driving heating when the remaining battery capacity of the power battery of the electric vehicle is the target battery capacity.

[0005] Optionally, the preset relationship is specifically expressed as the relationship between the capacity attenuation ratio of the power battery, the ambient temperature and a preset coefficient; the preset coefficient includes a first preset coefficient, which is determined according to a normalized temperature coefficient and a normalized attenuation coefficient, wherein different ambient temperatures correspond to different normalized temperature coefficients and different normalized attenuation coefficients.

[0006] Optionally, the preset coefficient also includes: a second preset coefficient, which is determined based on a temperature difference between a first temperature value corresponding to a normalized attenuation coefficient of the power battery capacity of 0 and a second temperature value corresponding to a normalized attenuation coefficient of the power battery capacity of 1, wherein the first temperature value is higher than the second temperature value.

[0007] Optionally, the preset coefficient also includes: a third preset coefficient, and the third preset coefficient is determined according to a boundary value of a use temperature range of the power battery.

[0008] Optionally, the preset coefficient also includes: a fourth preset coefficient, and the fourth preset coefficient is determined according to an error correction value, wherein the error correction value is calibrated under a specific temperature working condition.

[0009] Optionally, the preset coefficient also includes: a fifth preset coefficient, which is determined based on a heating temperature rise rate correction factor, wherein the heating temperature rise rate correction factor represents the relationship between the heating temperature rise rate of the boundary value and the heating temperature rise rate of the specific temperature, wherein different boundary values ​​correspond to different heating temperature rise rate correction factors.

[0010] Optionally, determining a target battery capacity for turning on driving heating according to the power battery capacity attenuation ratio includes: determining a target battery capacity for turning on driving heating according to a battery health of the power battery and the power battery capacity attenuation ratio.

[0011] Another embodiment of the present invention provides a driving heating control device, which is applied to an electric vehicle, including: an acquisition module, used to acquire the current ambient temperature during driving; a determination module, used to determine the power battery capacity attenuation ratio corresponding to the current ambient temperature according to a preset relationship; wherein the preset relationship represents the relationship between the ambient temperature and the battery capacity attenuation ratio; the determination module is also used to determine the target battery capacity for starting driving heating according to the power battery capacity attenuation ratio; and a control module, used to start driving heating when the remaining battery capacity of the power battery of the electric vehicle is the target battery capacity.

[0012] Yet another embodiment of the present invention provides a vehicle, comprising the driving heating control device as described above.

[0013] Another embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the vehicle heating control method described above are implemented.

[0014] The technical solution of the present invention has at least the following beneficial effects:

[0015] The driving heating control method of the embodiment of the present invention can obtain different power battery capacity attenuation ratios at different ambient temperatures according to a preset relationship, and can further obtain the target battery capacity when the driving heating is turned on according to the attenuation ratio. That is, the target battery capacity when the driving heating is turned on is different at different ambient temperatures. By dynamically adjusting the start point of the driving heating in combination with the ambient temperature, the target battery capacity when the driving heating is turned on corresponding to the ambient temperature can be more accurately determined. When the remaining battery capacity of the power battery is the target battery capacity, turning on the driving heating can avoid the loss of power caused by turning on the driving heating in advance, and can also avoid the reduction of cruising range caused by delaying the start of the driving heating, thereby effectively improving the cruising range of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of a vehicle heating control method provided by an embodiment of the present invention;

[0017] Figure 2 A fitting function curve diagram provided by an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of a module of a vehicle heating control device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present invention. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. In addition, for clarity and brevity, the description of known functions and structures is omitted.

[0020] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0021] In various embodiments of the present invention, it should be understood that the size of the serial numbers of the following processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0022] It should be understood that the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0023] In the embodiments provided by the present invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0024] See also Figure 1 An embodiment of the present invention provides a driving heating control method, which is applied to an electric vehicle. The method comprises the following steps:

[0025] Step 11: Get the current ambient temperature during driving.

[0026] It should be noted that the driving process generally refers to the electric vehicle being in a driving state, and the current ambient temperature can be obtained through a temperature sensor.

[0027] Step 12: Determine the power battery capacity attenuation ratio corresponding to the current ambient temperature according to a preset relationship; wherein the preset relationship represents the relationship between the ambient temperature and the battery capacity attenuation ratio.

[0028] It should be noted that by inputting the current ambient temperature into the preset relationship, the power battery capacity attenuation ratio at the current ambient temperature can be obtained. The power battery capacity attenuation ratio can be understood as the value of the power battery capacity reduction. For example, the current power battery capacity is 80% (0.08), when the power battery capacity attenuation ratio is 0.03 (3%), the power battery capacity after attenuation is 80%*(1-3%) or 80%-3%.

[0029] Step 13: Determine the target battery capacity for starting the driving heating according to the power battery capacity attenuation ratio.

[0030] Optionally, the target battery capacity for starting the driving heating is determined according to the battery health of the power battery and the power battery capacity attenuation ratio. For example, the target battery capacity can be obtained according to the power battery capacity attenuation ratio and the battery health (State Of Health, SOH) of the power battery, such as the product of the two.

[0031] Step 14: When the remaining battery capacity of the power battery of the electric vehicle is the target battery capacity, driving heating is turned on.

[0032] It should be noted that the remaining battery capacity of the power battery may also be referred to as the remaining battery capacity percentage (State Of Charge, SOC) of the power battery.

[0033] The driving heating control method provided by the present invention can obtain different power battery capacity attenuation ratios at different ambient temperatures according to a preset relationship, and further can obtain the target battery capacity when the driving heating is turned on according to the attenuation ratio. That is, at different ambient temperatures, the target battery capacity when the driving heating is turned on is different. By dynamically adjusting the start point of the driving heating in combination with the ambient temperature, the target battery capacity when the driving heating is turned on corresponding to the ambient temperature can be more accurately determined. When the remaining battery capacity of the power battery is the target battery capacity, the driving heating is turned on, which can avoid the loss of power caused by turning on the driving heating in advance, and can also avoid the reduction of the cruising range caused by delaying the start of the driving heating, thereby effectively improving the cruising range of the vehicle.

[0034] For example, the preset relationship is specifically expressed as the relationship between the power battery capacity attenuation ratio, the ambient temperature and the preset coefficient; the preset coefficient includes a first preset coefficient, which is determined according to a normalized temperature coefficient and a normalized attenuation coefficient, wherein different ambient temperatures correspond to different normalized temperature coefficients and different normalized attenuation coefficients.

[0035] It should be noted that the normalized temperature coefficient and the normalized attenuation coefficient are obtained by normalizing the battery capacity attenuation of the power battery at different temperatures. Specifically, the normalized temperature coefficient and the normalized attenuation coefficient of the power battery at different temperatures can be shown in Table 1.

[0036] Battery temperature Normalized Temperature Coefficient Normalized attenuation coefficient -30 -1 1 -25 -0.91 0.74 -20 -0.82 0.54 -15 -0.73 0.46 -10 -0.64 0.36 -5 -0.55 0.28 0 -0.45 0.22 5 -0.36 0.12 10 -0.27 0.1 15 -0.18 0.06 20 -0.09 0.04 25 0 0

[0037] Table 1

[0038] Furthermore, the preset coefficient also includes: a second preset coefficient, which is determined based on a temperature difference between a first temperature value corresponding to a normalized attenuation coefficient of the power battery capacity of 0 and a second temperature value corresponding to a normalized attenuation coefficient of the power battery capacity of 1, wherein the first temperature value is higher than the second temperature value.

[0039] Optionally, the preset relationship can be expressed by the following formula: Z = y2, y2 = c*x 2 +d*x+e, wherein x=(T-t1) / t2, Z represents the attenuation ratio, d and e are constants, T represents the current ambient temperature, t1 represents the temperature value when the power battery capacity attenuation coefficient is 0, and t2 represents the second preset coefficient.

[0040] Among them, c, d, and e are the first preset coefficients. By fitting the normalized temperature coefficient and the normalized attenuation coefficient in Table 1, we can get c=1.0344, b=0.1444, and c=0.0376, that is, y2=c*x 2 The specific expression formula of +d*x+e is y2=1.0344*x 2 +0.1444*x+0.0376. Specifically, the fitted function relationship curve is as follows: Figure 2 shown.

[0041] Optionally, the minimum value of t1 is 25°C, that is, the power battery capacity does not decay at 25°C and above. From Table 1, it can be seen that when the normalized attenuation coefficient of the power battery capacity is 1, the corresponding temperature value is -30°C, and the value of t2 is 55, that is,

[0042] Furthermore, the preset coefficient also includes: a third preset coefficient, and the third preset coefficient is determined according to a boundary value of a use temperature range of the power battery.

[0043] For example, Z=y1, y1=y2*f, where f is the maximum attenuation ratio at the boundary of the operating temperature range of the power battery.

[0044] The boundary value of the operating temperature range can be understood as the lowest temperature value of the area where the power battery is located, such as -25°C or -30°C. The value of the third preset coefficient may also be different depending on the boundary value of the operating temperature range of the power battery. Optionally, the third preset coefficient (f) can be 0.5, 0.35 or 0.6. When the third preset coefficient is 0.5,

[0045] Furthermore, the preset coefficient also includes: a fourth preset coefficient, and the fourth preset coefficient is determined according to the error correction value, wherein the error correction value is calibrated under a specific temperature working condition.

[0046] For example, Z=y1+b, where b is a constant greater than 0 and less than 1.

[0047] It should be noted that the target battery capacity is Z*SOH, where SOH is the current battery health of the power battery, and the heating needs to be turned on before SOC0>Z*SOH. Among them, the calculation base capacity of SOC0 is the maximum available capacity at normal temperature (25°C). Taking into account the influence of SOC error, in order to improve the accuracy of the preset relationship, it is necessary to increase the error correction value. Optionally, the error correction value (b) may be 5% or 4% or 7%. Among them, the fourth preset coefficient is obtained by calibrating the driving heating under Chinese operating conditions at -7°C. When the fourth preset coefficient is 5%, the driving heating start point (the target battery capacity for turning on driving heating) is Z*SOH.

[0048] For example,

[0049] Furthermore, the preset coefficient also includes: a fifth preset coefficient, which is determined based on a heating temperature rise rate correction factor, wherein the heating temperature rise rate correction factor represents the relationship between the heating temperature rise rate of the boundary value and the heating temperature rise rate of the specific temperature, wherein different boundary values ​​correspond to different heating temperature rise rate correction factors.

[0050] For example, Z=α*(y1+b), where α is a constant greater than 0 and less than 1.

[0051] It should be noted that considering the influence of ambient temperature on the temperature rise rate, it is necessary to increase the heating temperature rise rate correction factor, where the correction factor Where k is greater than j and less than 0, j and k both represent temperature values, V j represents the heating rate at temperature j, V k Indicates the heating temperature rise rate at temperature k. When the boundary value is -20℃, then Where V -20 The heating rate at -20℃, V -7 It is the heating temperature rise rate at -7°C. The heating temperature rise rate can be understood as the rate of increase of the power battery temperature per hour under heating conditions.

[0052] In summary,

[0053] The start point of driving heating is:

[0054]

[0055] Based on the same technical concept as the above-mentioned driving heating control method, see Figure 3 Another embodiment of the present invention provides a driving heating control device. The driving heating control device is applied to an electric vehicle and includes: an acquisition module 31, which is used to acquire the current ambient temperature during driving; a determination module 32, which is used to determine the power battery capacity attenuation ratio corresponding to the current ambient temperature according to a preset relationship; wherein the preset relationship represents the relationship between the ambient temperature and the battery capacity attenuation ratio; the determination module 32 is also used to determine the target battery capacity for starting driving heating according to the power battery capacity attenuation ratio; and a control module 33, which is used to start driving heating when the remaining battery capacity of the power battery of the electric vehicle is the target battery capacity.

[0056] Optionally, the preset relationship is specifically expressed as the relationship between the capacity attenuation ratio of the power battery, the ambient temperature and a preset coefficient; the preset coefficient includes a first preset coefficient, which is determined according to a normalized temperature coefficient and a normalized attenuation coefficient, wherein different ambient temperatures correspond to different normalized temperature coefficients and different normalized attenuation coefficients.

[0057] Optionally, the preset coefficient also includes: a second preset coefficient, which is determined based on a temperature difference between a first temperature value corresponding to a normalized attenuation coefficient of the power battery capacity of 0 and a second temperature value corresponding to a normalized attenuation coefficient of the power battery capacity of 1, wherein the first temperature value is higher than the second temperature value.

[0058] Optionally, the preset coefficient also includes: a third preset coefficient, and the third preset coefficient is determined according to a boundary value of a use temperature range of the power battery.

[0059] Optionally, the preset coefficient also includes: a fourth preset coefficient, and the fourth preset coefficient is determined according to an error correction value, wherein the error correction value is calibrated under a specific temperature working condition.

[0060] Optionally, the preset coefficient also includes: a fifth preset coefficient, which is determined based on a heating temperature rise rate correction factor, wherein the heating temperature rise rate correction factor represents the relationship between the heating temperature rise rate of the boundary value and the heating temperature rise rate of the specific temperature, wherein different boundary values ​​correspond to different heating temperature rise rate correction factors.

[0061] Optionally, when determining the target battery capacity for turning on driving heating according to the power battery capacity attenuation ratio, the determination module 32 is specifically used to: determine the target battery capacity for turning on driving heating according to the battery health of the power battery and the power battery capacity attenuation ratio.

[0062] The driving heating control device provided in the embodiment of the present invention can obtain different power battery capacity attenuation ratios at different ambient temperatures according to a preset relationship, and can further obtain the target battery capacity when the driving heating is turned on according to the attenuation ratio. That is, at different ambient temperatures, the target battery capacity when the driving heating is turned on is different. By dynamically adjusting the start point of the driving heating in combination with the ambient temperature, the target battery capacity when the driving heating is turned on corresponding to the ambient temperature can be more accurately determined. When the remaining battery capacity of the power battery is the target battery capacity, turning on the driving heating can avoid the loss of power caused by turning on the driving heating in advance, and can also avoid the reduction in cruising range caused by delaying the start of the driving heating, thereby effectively improving the cruising range of the vehicle.

[0063] Another embodiment of the present invention provides a vehicle, wherein the vehicle includes the driving heating control device as described above.

[0064] Yet another embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the vehicle heating control method described above are implemented.

[0065] In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0066] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0067] 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 should also be regarded as the scope of protection of the present invention.

Claims

1. A driving heating control method, applied to electric vehicles, characterized in that: include: Get the current ambient temperature during driving; Determine the power battery capacity attenuation ratio corresponding to the current ambient temperature according to a preset relationship; wherein the preset relationship represents the relationship between the ambient temperature and the battery capacity attenuation ratio; Determining a target battery capacity for starting driving heating according to the power battery capacity attenuation ratio; When the remaining battery capacity of the power battery of the electric vehicle is the target battery capacity, turning on the driving heating; The preset relationship is specifically expressed as the relationship between the power battery capacity attenuation ratio, the ambient temperature and the preset coefficient; The preset coefficient includes a first preset coefficient, which is determined according to a normalized temperature coefficient and a normalized attenuation coefficient, wherein different ambient temperatures correspond to different normalized temperature coefficients and different normalized attenuation coefficients; The preset coefficient further includes: a second preset coefficient, which is determined according to a temperature difference between a first temperature value corresponding to when the normalized attenuation coefficient of the power battery capacity is 0 and a second temperature value corresponding to when the normalized attenuation coefficient of the power battery capacity is 1, wherein the first temperature value is higher than the second temperature value; The preset relationship is expressed by the following formula: Z = y2, y2 = c*x 2 +d*x+e, wherein x=(T-t1) / t2, Z represents the attenuation ratio, d and e are constants, T represents the current ambient temperature, t1 represents the temperature value when the power battery capacity attenuation coefficient is 0, c, d, e are the first preset coefficients, and t2 represents the second preset coefficient.

2. The vehicle heating control method according to claim 1, characterized in that: The preset coefficient also includes: a third preset coefficient, and the third preset coefficient is determined according to a boundary value of a use temperature range of the power battery.

3. The vehicle heating control method according to claim 2, characterized in that: The preset coefficient also includes: a fourth preset coefficient, and the fourth preset coefficient is determined according to an error correction value, wherein the error correction value is calibrated under a working condition of a specific temperature.

4. The vehicle heating control method according to claim 3, characterized in that: The preset coefficient also includes: a fifth preset coefficient, which is determined according to a heating temperature rise rate correction factor, wherein the heating temperature rise rate correction factor represents the relationship between the heating temperature rise rate of the boundary value and the heating temperature rise rate of the specific temperature, wherein different boundary values ​​correspond to different heating temperature rise rate correction factors.

5. The vehicle heating control method according to claim 1, characterized in that: According to the power battery capacity attenuation ratio, a target battery capacity for starting driving heating is determined, including: The target battery capacity for turning on driving heating is determined based on the battery health of the power battery and the power battery capacity attenuation ratio.

6. A driving heating control device, applied to electric vehicles, characterized in that: include: The acquisition module is used to obtain the current ambient temperature during driving; A determination module, configured to determine the power battery capacity attenuation ratio corresponding to the current ambient temperature according to a preset relationship; wherein the preset relationship represents the relationship between the ambient temperature and the battery capacity attenuation ratio; The determination module is further used to determine the target battery capacity for starting the driving heating according to the power battery capacity attenuation ratio; A control module, used to start driving heating when the remaining battery capacity of the power battery of the electric vehicle is the target battery capacity; The preset relationship is specifically expressed as the relationship between the power battery capacity attenuation ratio, the ambient temperature and the preset coefficient; the preset coefficient includes a first preset coefficient, which is determined according to a normalized temperature coefficient and a normalized attenuation coefficient, wherein different ambient temperatures correspond to different normalized temperature coefficients and different normalized attenuation coefficients; The preset coefficient further includes: a second preset coefficient, which is determined according to a temperature difference between a first temperature value corresponding to when the normalized attenuation coefficient of the power battery capacity is 0 and a second temperature value corresponding to when the normalized attenuation coefficient of the power battery capacity is 1, wherein the first temperature value is higher than the second temperature value; The preset relationship is expressed by the following formula: Z = y2, y2 = c*x 2 +d*x+e, wherein x=(T-t1) / t2, Z represents the attenuation ratio, d and e are constants, T represents the current ambient temperature, t1 represents the temperature value when the power battery capacity attenuation coefficient is 0, c, d, e are the first preset coefficients, and t2 represents the second preset coefficient.

7. A vehicle, characterized in that: It includes the vehicle heating control device as described in claim 6.

8. A computer-readable storage medium, characterized in that: A computer program is stored on a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the vehicle heating control method according to any one of claims 1 to 5 are implemented.

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