CN112078430A - Electric vehicle driving mileage estimation method and device and electric vehicle - Google Patents

Electric vehicle driving mileage estimation method and device and electric vehicle Download PDF

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Publication number
CN112078430A
CN112078430A CN201910517198.3A CN201910517198A CN112078430A CN 112078430 A CN112078430 A CN 112078430A CN 201910517198 A CN201910517198 A CN 201910517198A CN 112078430 A CN112078430 A CN 112078430A
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mileage
battery
endurance
electric vehicle
determining
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CN112078430B (en
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许稣曼
王孟琰
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Beiqi Foton Motor Co Ltd
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Beiqi Foton Motor Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/16—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2260/00—Operating Modes
    • B60L2260/40—Control modes
    • B60L2260/50—Control modes by future state prediction
    • B60L2260/52—Control modes by future state prediction drive range estimation, e.g. of estimation of available travel distance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2260/00—Operating Modes
    • B60L2260/40—Control modes
    • B60L2260/50—Control modes by future state prediction
    • B60L2260/54—Energy consumption estimation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The disclosure relates to a driving mileage estimation method and device of an electric vehicle and the electric vehicle. The method comprises the following steps: acquiring the battery temperature, the battery health degree and the battery charge state of the electric vehicle; determining the endurance electric quantity of the battery according to the temperature of the battery, the health degree of the battery and the charge state of the battery; and determining the endurance mileage of the electric vehicle according to the endurance electric quantity. Through the technical scheme, when the endurance electric quantity of the battery is estimated, the influence of the temperature of the battery, the health degree of the battery and the charge state of the battery on the endurance electric quantity is comprehensively considered, the determined endurance electric quantity is adaptive to the service state of the battery, the accuracy of the determined endurance electric quantity is improved, the endurance mileage of the electric vehicle is estimated according to the endurance electric quantity of the battery, and the accuracy of the endurance mileage estimation result of the electric vehicle is improved.

Description

Electric vehicle driving mileage estimation method and device and electric vehicle
Technical Field
The disclosure relates to the field of electric vehicles, in particular to a driving mileage estimation method and device of an electric vehicle and the electric vehicle.
Background
Because the influence to the environment is less than traditional vehicle, and use cost is lower, electric vehicle's popularity is higher and higher, and more users select electric vehicle for use to go out. However, due to the position limitation of the charging pile and the fact that the time required for charging the electric vehicle is longer than the refueling time of the traditional vehicle, the driving range of the electric vehicle becomes important information to be referred to when a user travels.
When estimating the endurance mileage of an electric vehicle, the endurance capacity of a battery is one of the main parameters, and at present, the conventional battery endurance capacity estimation method mainly determines the endurance capacity through the rated capacity and the battery charge state, so as to determine the endurance mileage of the electric vehicle. However, when the electric vehicle is running, the battery capacity is affected by the battery usage state, and there is a gap between the battery capacity and the rated capacity. Therefore, the endurance electric quantity determined by the method has larger deviation, so that the endurance mileage of the electric vehicle is not accurately estimated.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a method and an apparatus for estimating a driving range of an electric vehicle with higher accuracy, and an electric vehicle.
In order to achieve the above object, according to a first aspect of the present disclosure, there is provided a range estimation method of an electric vehicle, the method including:
acquiring the battery temperature, the battery health and the battery state of charge of the electric vehicle;
determining the endurance electric quantity of the battery according to the battery temperature, the battery health degree and the battery charge state;
and determining the endurance mileage of the electric vehicle according to the endurance electric quantity.
Optionally, the determining the cruising power of the battery according to the battery temperature, the battery health and the battery state of charge includes:
determining an actual capacity of the battery corresponding to the battery temperature and the battery health;
and determining the product of the state of charge of the battery and the actual capacity as the endurance capacity of the battery.
Optionally, the determining the endurance mileage of the electric vehicle according to the endurance electric quantity includes:
determining the average power consumption corresponding to the preset driving mileage of the electric vehicle;
and determining the endurance mileage of the electric vehicle according to the endurance electric quantity and the average power consumption.
Optionally, the determining an average power consumption amount corresponding to a preset mileage driven by the electric vehicle includes:
determining power consumption corresponding to the preset mileage according to the battery temperature, the battery health degree and the battery charge state corresponding to the preset mileage when the electric vehicle runs;
determining a ratio of the power consumption to the preset mileage as the average power consumption.
Optionally, the method further comprises:
determining an output mileage according to the endurance mileage;
and outputting the output mileage.
Optionally, the determining an output mileage according to the driving mileage includes:
if the driving mileage is larger than or equal to the output mileage determined last time, taking the value obtained by subtracting a first descending mileage from the output mileage determined last time as the output mileage determined this time, wherein the first descending mileage is determined by the following formula:
L1＝△SOC*LT*
wherein L1 represents the first descending mileage;
delta SOC represents the variation of the corresponding battery state of charge from the last determined endurance mileage to the current determined endurance mileage;
LTrepresenting a constant-speed mileage, wherein the constant-speed mileage represents a standard mileage traveled at an average speed of the electric vehicle corresponding to a period from a last determined driving mileage to a present determined driving mileage when the state of charge variation of the battery is a unit variation;
represents a preset coefficient, and 0< < 1.
Optionally, the determining an output mileage according to the driving mileage includes:
if the last determined output mileage is greater than the endurance mileage and the difference between the last determined output mileage and the endurance mileage is greater than a preset threshold, taking the value obtained by subtracting a second reduced mileage from the last determined output mileage as the determined output mileage, wherein the second reduced mileage is determined by the following formula:
L2＝△T*VL
wherein L2 represents the second descending mileage;
the delta T represents a time period corresponding to the endurance mileage determined last time to the endurance mileage determined this time;
VLindicating a preset mileage lowering rate.
According to a second aspect of the present disclosure, there is provided a range estimation apparatus of an electric vehicle, the apparatus including:
the acquisition module is used for acquiring the battery temperature, the battery health degree and the battery charge state of the electric vehicle;
the endurance electric quantity determining module is used for determining the endurance electric quantity of the battery according to the battery temperature, the battery health degree and the battery charge state;
and the endurance mileage determining module is used for determining the endurance mileage of the electric vehicle according to the endurance electric quantity.
Optionally, the cruising power determining module includes:
a first determination submodule for determining an actual capacity of the battery corresponding to the battery temperature and the battery health;
and the first calculation submodule is used for determining the product of the state of charge of the battery and the actual capacity as the cruising electric quantity of the battery.
Optionally, the driving range determining module includes:
the average power consumption determining submodule is used for determining the average power consumption corresponding to the preset driving mileage of the electric vehicle;
and the second determining submodule is used for determining the endurance mileage of the electric vehicle according to the endurance electric quantity and the average power consumption.
Optionally, the average power consumption determination sub-module includes:
the third determining submodule is used for determining the power consumption corresponding to the preset mileage according to the battery temperature, the battery health degree and the battery charge state corresponding to the preset mileage after the electric vehicle runs;
and the second calculation submodule is used for determining the ratio of the power consumption to the preset mileage as the average power consumption.
Optionally, the apparatus further comprises:
the determining module is used for determining output mileage according to the endurance mileage;
and the output module is used for outputting the output mileage.
Optionally, the determining module includes:
a third calculating submodule, configured to, if the driving range is greater than or equal to the last determined output range, use a value obtained by subtracting a first reduction range from the last determined output range as the current determined output range, where the first reduction range is determined by a formula:
L1＝△SOC*LT*
wherein L1 represents the first descending mileage;
delta SOC represents the variation of the corresponding battery state of charge from the last determined endurance mileage to the current determined endurance mileage;
LTrepresenting a constant-speed mileage, wherein the constant-speed mileage represents a standard mileage traveled at an average speed of the electric vehicle corresponding to a period from a last determined driving mileage to a present determined driving mileage when the state of charge variation of the battery is a unit variation;
represents a preset coefficient, and 0< < 1.
Optionally, the determining module includes:
a fourth calculating submodule, configured to, if the last determined output mileage is greater than the driving mileage and a difference between the last determined output mileage and the driving mileage is greater than a preset threshold, use a value obtained by subtracting a second decreasing mileage from the last determined output mileage as the current determined output mileage, where the second decreasing mileage is determined by the following formula:
L2＝△T*VL
wherein L2 represents the second descending mileage;
the delta T represents a time period corresponding to the endurance mileage determined last time to the endurance mileage determined this time;
VLindicating a preset mileage lowering rate.
According to a third aspect of the present disclosure, there is provided an electric vehicle including:
a second aspect of the present disclosure provides the range estimation device of the electric vehicle.
Through the technical scheme, when the endurance electric quantity of the battery is estimated, the influence of the temperature of the battery, the health degree of the battery and the charge state of the battery on the endurance electric quantity is comprehensively considered, so that the determined endurance electric quantity is adaptive to the service state of the battery, the accuracy of the determined endurance electric quantity is improved, the endurance mileage of the electric vehicle is estimated according to the endurance electric quantity of the battery, and the accuracy of the endurance mileage estimation result of the electric vehicle is improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flow chart of a range estimation method for an electric vehicle provided according to one embodiment of the present disclosure;
FIG. 2 is a flow chart of a range estimation method for an electric vehicle provided in accordance with another embodiment of the present disclosure;
fig. 3 is a block diagram of a range estimation apparatus of an electric vehicle provided according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart of a range estimation method of an electric vehicle provided according to an embodiment of the present disclosure. As shown in fig. 1, the estimation method includes the steps of:
in step S11, the battery temperature, the battery health, and the battery state of charge of the electric vehicle are acquired.
Among other things, battery temperature, battery health, and battery state of charge of an electric vehicle may be used to characterize the state of use of the battery. The State of Health (SOH) refers to the percentage of the full charge capacity of the battery relative to the rated capacity, and represents the degree of aging of the battery. The State of Charge (SOC) of a battery refers to the ratio of the amount of dischargeable power remaining after the battery has been used for a period of time or left unused for a long period of time to the amount of power in its fully charged State. The battery temperature, the battery health degree and the battery charge state can be detected and determined by the battery, and can also be detected and determined by a battery management system. For example, the battery temperature may be detected by a temperature sensor on the battery.
In step S12, the cruising power of the battery is determined according to the battery temperature, the battery health, and the battery state of charge.
The inventor finds that when the endurance capacity of the battery is determined, the determined endurance capacity is different due to different battery temperatures under the same other conditions. Therefore, the battery temperature affects the actual capacity of the battery, and further affects the determined cruising power of the battery. Therefore, in the embodiments provided in the present disclosure, the manner of determining the battery endurance capacity according to the battery temperature, the battery health, and the battery state of charge may be:
determining an actual capacity of the battery corresponding to the battery temperature and the battery health;
and determining the product of the state of charge of the battery and the actual capacity as the endurance capacity of the battery.
The actual capacity of the battery refers to the amount of stored electricity when the battery is fully charged. The correspondence among the battery temperature, the battery health degree, and the actual capacity of the battery may be predetermined, and may be expressed by a relationship curve, a function relationship, or a mapping table, for example. The corresponding relationship curve, function relationship or mapping table may be determined in advance according to a battery characteristic test. In an embodiment, the corresponding relationship is expressed by a mapping table, so that when the actual capacity of the battery is determined, the actual capacity of the battery can be determined by querying the mapping table according to the temperature and the health degree of the battery. According to the scheme, the determined actual capacity of the battery is the actual capacity corresponding to the battery temperature and the battery health degree, and the determination result of the actual capacity of the battery is more accurate.
And after the actual capacity of the battery is determined, determining the product of the state of charge of the battery and the actual capacity of the battery as the cruising electric quantity of the battery.
Through the technical scheme, when the actual capacity of the battery is determined, the corresponding actual capacity of the battery is determined according to the battery temperature and the battery health degree, the influence of the battery temperature on the actual capacity of the battery is fully considered, the determined actual capacity of the battery is more accurate, the determined endurance electric quantity is more accurate, and accurate data support is provided for the follow-up determination of the endurance mileage.
In step S13, the driving range of the electric vehicle is determined based on the driving range.
In an embodiment, after the endurance electric quantity is determined, the endurance mileage of the electric vehicle can be determined in an existing endurance mileage determining manner.
In the technical scheme, when the endurance electric quantity of the battery is estimated, the influence of the temperature of the battery, the health degree of the battery and the charge state of the battery on the endurance electric quantity is comprehensively considered, so that the determined endurance electric quantity is adaptive to the service state of the battery, the accuracy of the determined endurance electric quantity is improved, the endurance mileage of the electric vehicle is estimated according to the endurance electric quantity of the battery, and the accuracy of the endurance mileage estimation result of the electric vehicle is improved.
The inventors found in the research that, when determining the driving range of the electric vehicle according to the driving range, the driving state of the electric vehicle also has a large influence on the driving range, for example, when the vehicle drives on a rugged road surface and a flat road surface, the corresponding average power consumption amounts are different, and thus the present disclosure also provides the following embodiments.
Alternatively, in another embodiment, an exemplary implementation of determining the range of the electric vehicle according to the range charge is as follows:
determining the average power consumption corresponding to the preset driving mileage of the electric vehicle;
and determining the endurance mileage of the electric vehicle according to the endurance electric quantity and the average power consumption.
The initial value of the average power consumption may be set to an average power consumption measured by NEDC (New European Driving Cycle) or C-WTVC (World Transient Vehicle Cycle), and the initial value is a value preset when the entire Vehicle leaves the factory.
Specifically, the average power consumption can be calculated once when the vehicle runs a preset mileage, the preset mileage can be selected according to the battery charge state of the electric vehicle, when the battery charge state is high, the preset mileage can be selected to have a large value, when the battery charge state is low, the preset mileage can be selected to have a small value, and the preset mileage can be adjusted in the running process of the electric vehicle. For example, the preset mileage may be preset to be 5 kilometers, and the average power consumption may be calculated once every 5 kilometers of the electric vehicle, so as to determine the average power consumption corresponding to the 5 kilometers of the electric vehicle. In the running process of the electric vehicle, the running mileage of the electric vehicle can be determined by integrating the running speed of the electric vehicle according to time, and the real-time performance of the determined average power consumption is guaranteed. The calculation method of the integral is the prior art, and is not described herein again.
And after the average power consumption corresponding to the preset driving mileage of the electric vehicle is determined, determining the driving mileage of the electric vehicle according to the driving power and the average power consumption.
Specifically, the ratio of the cruising power amount to the average power consumption amount may be determined as the cruising range of the electric vehicle.
Therefore, the average power consumption of the electric vehicle is determined in the driving process of the electric vehicle, the endurance mileage is determined based on the average power consumption, the endurance mileage can be determined by combining the driving state of the electric vehicle, the estimation of the endurance mileage is more accurate, and the applicability of the estimation method of the endurance mileage of the electric vehicle is wider.
Optionally, the determining an average power consumption amount corresponding to a preset mileage driven by the electric vehicle includes:
determining power consumption corresponding to the preset mileage according to the battery temperature, the battery health degree and the battery charge state corresponding to the preset mileage when the electric vehicle runs;
determining a ratio of the power consumption to the preset mileage as the average power consumption.
The battery temperature corresponding to the preset mileage during the running of the electric vehicle can be as follows: a weighted or average battery temperature of an initial battery temperature and a terminal battery temperature during a preset range of travel. The battery health corresponding to the preset driving mileage of the electric vehicle may be: an initial battery health level and a weighted or average battery health level of a terminal battery health level during a preset range of travel. The weight in the calculation process may be set according to an actual usage scenario, which is not limited in this disclosure. The state of charge of the battery corresponding to the preset driving mileage of the electric vehicle can be as follows: and the difference value between the initial state of charge and the final state of charge of the battery in the process of driving the preset mileage.
The following specifically describes the determination method of the average power consumption, taking the preset mileage as 5km as an example:
determining the actual capacity of the battery corresponding to the average battery temperature and the average battery health degree according to the average battery temperature and the average battery health degree corresponding to 5 kilometers of the electric vehicle and the corresponding relation among the battery temperature, the battery health degree and the actual capacity of the battery;
acquiring a difference value between an initial state of charge and a final state of charge of a battery in the process that the electric vehicle runs for 5 kilometers, and determining the product of the actual capacity of the battery corresponding to the running 5 kilometers and the difference value of the state of charge of the battery as the power consumption corresponding to the running 5 kilometers of the electric vehicle;
and determining the ratio of the power consumption corresponding to the 5km driving of the electric vehicle to the 5km as the average power consumption corresponding to the 5km driving of the electric vehicle.
Through the technical scheme, when the power consumption corresponding to the preset mileage is determined to drive the electric vehicle, the corresponding power consumption is determined according to the battery temperature and the battery health degree corresponding to the preset mileage, so that the power consumption corresponding to the preset mileage during driving of the electric vehicle is matched with the state of the electric vehicle, the calculation result of the average power consumption is more accurate, the cruising mileage of the electric vehicle determined according to the cruising electric quantity and the average power consumption is more accurate, and the accurate data reference is provided for a user.
Fig. 2 is a flowchart of a range estimation method of an electric vehicle provided according to another embodiment of the present disclosure. As shown in fig. 2, the estimation method may further include the steps of:
in step S14, the output mileage is determined based on the mileage.
In step S15, the output mileage is output.
The output mileage is used for prompting the user so that the user can intuitively feel the endurance mileage of the electric vehicle. For example, the step of outputting the output mileage may be outputting the output mileage to a vehicle instrument panel or a display screen for display, or outputting the output mileage to a voice broadcast device on the vehicle for broadcast so as to prompt the user. The foregoing is merely exemplary and is not intended to limit the present disclosure.
The output mileage is determined according to the endurance mileage, and the output mileage is prompted to the user, so that the user can accurately and effectively judge the endurance mileage of the electric vehicle in the driving process, and the driving experience of the user is improved.
The inventor finds in research that during the driving process of the electric vehicle, when the driving range of the electric vehicle is estimated, the phenomenon that the re-determined driving range is larger than the driving range currently prompted to the user may occur. That is, while the electric vehicle is traveling, the specified range of the electric vehicle increases (hereinafter, simply referred to as reverse increase) although the battery state of charge decreases. For example, during the running of the electric vehicle, the battery temperature rises to make the determined actual capacity of the battery larger, which results in the determined battery life becoming larger. For another example, when the electric vehicle is switched from a severe condition to a mild condition, the average power consumption of the subsequent battery is relatively reduced, so that the determined battery endurance capacity becomes large. If the estimated endurance mileage is directly prompted to the user, reliable endurance mileage cannot be provided for the user, and judgment of the user on the endurance mileage of the electric vehicle is affected. In order to provide a more reasonable and reliable continuation of the journey mileage prompt for a user and improve the driving experience of the user, the following embodiments are also provided.
Optionally, in an embodiment, determining an output mileage according to the driving mileage includes:
if the driving mileage is larger than or equal to the output mileage determined last time, taking the value obtained by subtracting a first descending mileage from the output mileage determined last time as the output mileage determined this time, wherein the first descending mileage is determined by the following formula:
L1＝△SOC*LT*
wherein L1 represents the first descending mileage;
delta SOC represents the variation of the corresponding battery state of charge from the last determined endurance mileage to the current determined endurance mileage;
LTrepresenting a constant-speed mileage, wherein the constant-speed mileage represents a standard mileage traveled at an average speed of the electric vehicle corresponding to a period from a last determined driving mileage to a present determined driving mileage when the state of charge variation of the battery is a unit variation;
represents a preset coefficient, and 0< < 1.
When the output mileage is determined for the first time, the determined driving mileage of the electric vehicle is taken as the output mileage determined at this time, so as to prompt the user.
Wherein the constant velocity mileage LTMay be preset according to experiments. The preset coefficient is a parameter which is larger than 0 and smaller than 1, and can be set according to the actual driving condition. Therefore, the output mileage is lowered to a smaller extent than it is actually.
For example, if the driving range obtained by the driving range estimation method of the electric vehicle is 101km and the output range determined last time is 100km, the driving range is reversely increased during driving, the estimated 101km cannot be directly output as the output range determined this time, a value obtained by subtracting the first descending range from the output range 100km determined last time may be used as the output range determined this time, and for example, if the first descending range L1 is determined to be 2km, 98km may be presented to the user as the output range determined this time.
Through the technical scheme, when the mileage raises reversely, the last determined output mileage can be adjusted to determine the current output mileage, for example, a value obtained by subtracting the first lowered mileage from the last determined output mileage is used as the current determined output mileage to prompt a user, so that the output mileage is gradually lowered in the driving process of the electric vehicle, the condition that the output mileage raises reversely is avoided, a more reasonable and reliable mileage is provided for the user, and the driving experience of the user is improved.
In the research process, the inventor also finds that, as described above, the determined descending speed of the mileage (hereinafter referred to as descending jump) may be too fast due to the influence of the battery temperature and the driving condition of the electric vehicle, and the determined mileage may not provide the reliable mileage to the user and may easily cause the mileage anxiety psychology of the user. In order to provide the user with a more reasonable continuation of the journey mileage prompt and improve the driving experience of the user, the present disclosure also provides the following embodiments.
Optionally, in another embodiment, the determining an output mileage according to the driving mileage includes:
if the last determined output mileage is greater than the endurance mileage and the difference between the last determined output mileage and the endurance mileage is greater than a preset threshold, taking the value obtained by subtracting a second reduced mileage from the last determined output mileage as the determined output mileage, wherein the second reduced mileage is determined by the following formula:
L2＝△T*VL
wherein L2 represents the second descending mileage;
the delta T represents a time period corresponding to the endurance mileage determined last time to the endurance mileage determined this time;
VLindicating a preset mileage lowering rate.
The preset threshold may be set according to an actual driving condition, for example, the preset threshold may be set to 3 km. Preset mileage lowering speed VLThe mileage drop velocity V may be set in advance, for exampleLMay be set to 0.1 km/s.
For example, if the driving range obtained by the driving range estimation method of the electric vehicle is 95km and the last determined output range is 100km, the difference between the last determined output range and the driving range is greater than a preset threshold value of 3km, which indicates that the driving range is too fast to descend and the descending and jumping situation occurs, and if the estimated 95km is directly output, a reliable driving range cannot be provided for the user, and a value obtained by subtracting the second descending range from the last determined output range of 100km can be used as the current determined output range. For example, a preset mileage lowering speed VLThe second descending mileage L2 may be set to 0.1km/s, and if the time period Δ T corresponding to the last determined mileage to the current determined mileage is 10s, the second descending mileage L2 may be 1km, and at this time, 99km may be used as the output mileage of the current determination.
In an example, if the driving mileage is less than the last determined output mileage and the difference between the last determined output mileage and the driving mileage is less than or equal to a preset threshold, the driving mileage is taken as the current determined output mileage to prompt the user.
In the above technical solution, when the mileage has a phenomenon of descending and jumping, the last determined output mileage may be adjusted to determine the current output mileage, for example, a value obtained by subtracting the second descending mileage from the last determined output mileage is used as the current determined output mileage to prompt the user, and the descending speed of the output mileage is limited to prevent the situation that the descending speed of the output mileage is too fast to bring mileage anxiety to the user, so as to provide a more reasonable and reliable mileage, and improve the driving experience of the user.
The present disclosure also provides a driving range estimation apparatus of an electric vehicle, fig. 3 is a block diagram of the driving range estimation apparatus of an electric vehicle provided according to an embodiment of the present disclosure, and as shown in fig. 3, the driving range estimation apparatus 10 of an electric vehicle may include:
the acquiring module 11 is used for acquiring the battery temperature, the battery health degree and the battery charge state of the electric vehicle;
the endurance electric quantity determining module 12 is configured to determine the endurance electric quantity of the battery according to the battery temperature, the battery health degree, and the battery state of charge;
and the endurance mileage determining module 13 is configured to determine the endurance mileage of the electric vehicle according to the endurance electric quantity.
Optionally, the cruising power determining module includes:
a first determination submodule for determining an actual capacity of the battery corresponding to the battery temperature and the battery health;
and the first calculation submodule is used for determining the product of the state of charge of the battery and the actual capacity as the cruising electric quantity of the battery.
Optionally, the driving range determining module includes:
the average power consumption determining submodule is used for determining the average power consumption corresponding to the preset driving mileage of the electric vehicle;
and the second determining submodule is used for determining the endurance mileage of the electric vehicle according to the endurance electric quantity and the average power consumption.
Optionally, the average power consumption determination sub-module includes:
the third determining submodule is used for determining the power consumption corresponding to the preset mileage according to the battery temperature, the battery health degree and the battery charge state corresponding to the preset mileage after the electric vehicle runs;
and the second calculation submodule is used for determining the ratio of the power consumption to the preset mileage as the average power consumption.
Optionally, the apparatus further comprises:
the determining module is used for determining output mileage according to the endurance mileage;
and the output module is used for outputting the output mileage.
Optionally, the determining module includes:
a third calculating submodule, configured to, if the driving range is greater than or equal to the last determined output range, use a value obtained by subtracting a first reduction range from the last determined output range as the current determined output range, where the first reduction range is determined by a formula:
L1＝△SOC*LT*
wherein L1 represents the first descending mileage;
delta SOC represents the variation of the corresponding battery state of charge from the last determined endurance mileage to the current determined endurance mileage;
LTrepresenting a constant-speed mileage, wherein the constant-speed mileage represents a standard mileage traveled at an average speed of the electric vehicle corresponding to a period from a last determined driving mileage to a present determined driving mileage when the state of charge variation of the battery is a unit variation;
represents a preset coefficient, and 0< < 1.
Optionally, the determining module includes:
a fourth calculating submodule, configured to, if the last determined output mileage is greater than the driving mileage and a difference between the last determined output mileage and the driving mileage is greater than a preset threshold, use a value obtained by subtracting a second decreasing mileage from the last determined output mileage as the current determined output mileage, where the second decreasing mileage is determined by the following formula:
L2＝△T*VL
wherein L2 represents the second descending mileage;
the delta T represents a time period corresponding to the endurance mileage determined last time to the endurance mileage determined this time;
VLindicating a preset mileage lowering rate.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The present disclosure also provides an electric vehicle including:
the present disclosure provides a driving range estimation device of an electric vehicle.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A driving range estimation method of an electric vehicle, characterized by comprising:
acquiring the battery temperature, the battery health and the battery state of charge of the electric vehicle;
determining the endurance electric quantity of the battery according to the battery temperature, the battery health degree and the battery charge state;
and determining the endurance mileage of the electric vehicle according to the endurance electric quantity.
2. The method of claim 1, wherein said determining a range charge of said battery based on said battery temperature, said battery health, and said battery state of charge comprises:
determining an actual capacity of the battery corresponding to the battery temperature and the battery health;
and determining the product of the state of charge of the battery and the actual capacity as the endurance capacity of the battery.
3. The method of claim 1, wherein determining the range of the electric vehicle from the range charge comprises:
determining the average power consumption corresponding to the preset driving mileage of the electric vehicle;
and determining the endurance mileage of the electric vehicle according to the endurance electric quantity and the average power consumption.
4. The method of claim 3, wherein the determining the average power consumption corresponding to the preset mileage driven by the electric vehicle comprises:
determining power consumption corresponding to the preset mileage according to the battery temperature, the battery health degree and the battery charge state corresponding to the preset mileage when the electric vehicle runs;
determining a ratio of the power consumption to the preset mileage as the average power consumption.
5. The method according to any one of claims 1-4, further comprising:
determining an output mileage according to the endurance mileage;
and outputting the output mileage.
6. The method of claim 5, wherein determining an output range from the range comprises:
if the driving mileage is larger than or equal to the output mileage determined last time, taking the value obtained by subtracting a first descending mileage from the output mileage determined last time as the output mileage determined this time, wherein the first descending mileage is determined by the following formula:
L1＝△SOC*LT*
wherein L1 represents the first descending mileage;
delta SOC represents the variation of the corresponding battery state of charge from the last determined endurance mileage to the current determined endurance mileage;
LTrepresenting a constant-speed mileage, wherein the constant-speed mileage represents a standard mileage traveled at an average speed of the electric vehicle corresponding to a period from a last determined driving mileage to a present determined driving mileage when the state of charge variation of the battery is a unit variation;
represents a preset coefficient, and 0< < 1.
7. The method of claim 5, wherein determining an output range from the range comprises:
if the last determined output mileage is greater than the endurance mileage and the difference between the last determined output mileage and the endurance mileage is greater than a preset threshold, taking the value obtained by subtracting a second reduced mileage from the last determined output mileage as the determined output mileage, wherein the second reduced mileage is determined by the following formula:
L2＝△T*VL
wherein L2 represents the second descending mileage;
the delta T represents a time period corresponding to the endurance mileage determined last time to the endurance mileage determined this time;
VLindicating a preset mileage lowering rate.
8. An electric vehicle driving range estimation device, characterized by comprising:
the acquisition module is used for acquiring the battery temperature, the battery health degree and the battery charge state of the electric vehicle;
the endurance electric quantity determining module is used for determining the endurance electric quantity of the battery according to the battery temperature, the battery health degree and the battery charge state;
and the endurance mileage determining module is used for determining the endurance mileage of the electric vehicle according to the endurance electric quantity.
9. The apparatus of claim 8, wherein the endurance determination module comprises:
a first determination submodule for determining an actual capacity of the battery corresponding to the battery temperature and the battery health;
and the first calculation submodule is used for determining the product of the state of charge of the battery and the actual capacity as the cruising electric quantity of the battery.
10. An electric vehicle, characterized in that the electric vehicle comprises:
the range estimation device of an electric vehicle according to claim 8 or 9.
CN201910517198.3A 2019-06-14 2019-06-14 Electric vehicle driving mileage estimation method and device and electric vehicle Active CN112078430B (en)

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