CN109795369B - Electric automobile endurance mileage estimation method based on average power consumption - Google Patents
Electric automobile endurance mileage estimation method based on average power consumption Download PDFInfo
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Abstract
The invention provides an electric automobile endurance mileage estimation method based on average power consumption. The method comprises the following steps: recording a group of real-time battery electric quantity information as a current group of real-time battery electric quantity information every driving distance d, and updating m groups of real-time battery electric quantity information at the previous moment by using the current group of real-time electric quantity information; acquiring m groups of real-time battery electric quantity information at the current moment at preset time intervals; calculating the average power consumption within the distance of m multiplied by d according to the m groups of real-time battery power information at the current moment; taking the mth group of real-time battery electric quantity information at the current moment as the battery electric quantity information at the current moment, and estimating by using the battery electric quantity information at the current moment and the average power consumption to obtain the endurance mileage; and filtering the estimated cruising mileage and displaying the filtered cruising mileage on the instrument. The method does not depend on the vehicle navigation and the cloud platform, is simple in calculation, and the cruising mileage displayed by the instrument after filtering does not jump any more.
Description
Technical Field
The invention relates to the technical field of estimation of the endurance mileage of automobiles, in particular to an electric automobile endurance mileage estimation method based on average power consumption.
Background
The electric automobile is limited by the development bottleneck of the battery industry, the endurance mileage of the electric automobile cannot meet the psychological needs of consumers, the charging is not as convenient as the fuel oil filling, so that the electric automobile owner pays special attention to the endurance mileage when going out, but the endurance mileage is limited by the influence of a plurality of factors such as the estimation of the battery electric quantity, the driving habits of the driver, the driving working conditions and the like, and the endurance mileage is difficult to achieve very accurately.
Chinese patent publication No. CN105459842A discloses a method for estimating a driving mileage of an electric vehicle, which searches for a predicted power consumption amount and compares the predicted power consumption amount with an actual remaining power amount by using a path stored in a cloud platform and a planned path to determine the driving mileage. The method depends on a vehicle-mounted navigation system and a cloud platform, information such as vehicle load information and driver habits cannot be uploaded to the platform, and certain errors exist in power consumption given by the platform.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the electric vehicle endurance mileage estimation method based on average power consumption, which is independent of vehicle navigation and a cloud platform, is simple in calculation, and the endurance mileage displayed by an instrument after filtering does not jump any more.
The invention provides an electric automobile endurance mileage estimation method based on average power consumption, which mainly comprises the following steps:
step 1, every driving distancedRecording a group of real-time battery electric quantity information as the current group of real-time battery electric quantity information, and utilizing the current group of real-time electric quantity information to the previous momentmUpdating the battery electric quantity information in real time;
step 2, obtaining the current time at preset time intervalsmPack real-time battery power information;
step 3, according to the current timemGroup real-time battery power information is calculated inm×dAverage power consumption over distance;
step 4, the first time of the current timemThe real-time battery electric quantity information is used as the battery electric quantity information at the current moment, and the battery electric quantity information at the current moment and the average power consumption are used for estimating to obtain the endurance mileage;
and 5, filtering the estimated cruising mileage and displaying the filtered cruising mileage on the instrument.
Further, the real-time battery power information is calculated according to the formula (1):
wherein,ashowing the influence factor, the temperature and the cell pressure difference of the power battery(ii) related;SOCrepresenting the percentage of the residual capacity of the power battery;SOHrepresenting the state of health of the power battery;SOErepresenting the energy state of the power battery.
Further, the step 1 of utilizing the current set of real-time electric quantity information to the previous momentmThe updating of the battery capacity information of the battery pack in real time specifically comprises the following steps:
definition ofnOf time of daymThe real-time battery power information is
Distance traveleddThe later time is recorded asn+Time 1, distance traveleddThe current real-time electric quantity information recorded later is
Then, thenn+At time 1mThe real-time battery power information is
。
Further, the said in step 3m×dThe average power consumption over the distance is calculated according to equation (2):
wherein,
represents the average power consumption at the present time T,
the 1 st real-time battery power information indicating the current time T,
indicates the current time TmReal-time battery power information.
Further, the driving range in step 4 is calculated according to equation (3):
wherein,bthe influence factor is related to the temperature of the motor, the temperature of the motor controller MCU and the total voltage of the power battery;
represents the average power consumption at the present time T,
indicates the current time TmAnd grouping real-time battery power information.
Further, the step 5 of filtering the estimated driving range specifically includes:
the estimated driving mileageR C And the endurance mileage displayed by the current instrumentR O Comparing to obtain a comparison resultX=R C -R O ；
If it isX≥0Then distance traveledD1 after make the continuation of journey mileage that the present instrument showsR O -1; if it isX<0Then distance traveledD2 after make the continuation of the journey mileage that the present instrument showsR O -1; wherein,
，D1 andD2 is a real number.
The invention has the beneficial effects that:
the average power consumption is calculated according to the latest driving working condition, the average power consumption changes in real time along with the change of the driving working condition, the estimated endurance mileage is compared with the endurance mileage displayed by the instrument, and the estimated endurance mileage is filtered according to the comparison result, namely the actual endurance mileage is continuously approached by adjusting the speed of the change of the endurance mileage displayed by the instrument, so that the endurance mileage displayed by the instrument cannot jump greatly, and the accuracy of the endurance mileage is improved.
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Fig. 1 is a schematic flow chart of a method for estimating a driving range of an electric vehicle based on average power consumption according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a method for estimating a driving range of an electric vehicle based on average power consumption according to an embodiment of the present invention. As shown in fig. 1, the method comprises the steps of:
s101, distance per drivingdRecording a group of real-time battery electric quantity information as the current group of real-time battery electric quantity information, and utilizing the current group of real-time electric quantity information to the previous momentmUpdating the battery capacity information of the battery pack in real time;
s102, acquiring the current time at preset time intervalsmPack real-time battery power information;
s103, according to the current timemGroup real-time battery power information is calculated inm×dAverage power consumption over distance;
s104, comparing the current timemThe real-time battery electric quantity information is used as the battery electric quantity information at the current moment, and the battery electric quantity information at the current moment and the average power consumption are used for estimating to obtain the endurance mileage;
and S105, filtering the estimated cruising range and displaying the filtered cruising range on the instrument.
According to the method for estimating the endurance mileage of the electric vehicle based on the average power consumption, provided by the embodiment of the invention, the average power consumption is calculated according to the recent driving working condition, the average power consumption changes in real time along with the change of the driving working condition, the estimated endurance mileage is compared with the endurance mileage displayed by the instrument, and the estimated endurance mileage is filtered according to the comparison result, namely the actual endurance mileage is continuously approached by adjusting the speed of the change of the endurance mileage displayed by the instrument, so that the endurance mileage displayed by the instrument does not jump greatly, and the accuracy of the endurance mileage is improved.
On the basis of the above embodiment, the present invention provides another embodiment, and the embodiment of the present invention uses the distancedThe value is 1 km, and the number of the chips is,mfor example, the flow is as follows:
s201, every time an automobile runs for 1 kilometer, an instrument sends electric quantity information to a CAN bus through a battery management system BMS to acquire primary real-time battery electric quantity information, the transmission rate of the CAN bus is 250 kbit/S, the acquired real-time battery electric quantity information is stored locally, and 50 groups of electric quantity information are recorded; and updating the 50 groups of power information recorded at the previous moment by using the latest acquired real-time battery power information.
As an implementation manner, the real-time battery power information in this step is calculated according to equation (1):
wherein,aand the influence factor is expressed and is related to the temperature of the power battery and the cell pressure difference. In generalaThe value range of (A) is 0-1, when the temperature is overhigh or the monomer pressure difference is overlarge,a= 0; when the temperature exceeds the warning value or the monomer differential pressure exceeds the warning value, the power is linearly reduced according to the voltage,athe value decreases from 1, the lower the voltage,athe smaller the value.SOC(State Of Charge) represents the percentage Of the remaining capacity Of the power battery.SOHThe State Of Health (State Of Health) represents the Health State Of the power battery, is related to the number Of charging and discharging times, the magnitude Of charging and discharging current and the use environment Of the battery pack, and generally ranges from 0.8 to 1.SOE(State Of Energy) represents the Energy State Of the power battery, and the vehicle batteryThe total charge of the pack is related and generally ranges from 16kWh to 60 kWh.
Distance traveleddThe vehicle speed information sent to a CAN bus by an ABS is firstly obtained by an instrument, and then the vehicle speed information is calculated through integration with time.
As an implementation, the update in this step may be performed as follows: definition ofnOf time of daymThe pack real-time battery power information is
Distance traveleddThe later time is recorded asn+Time 1, distance traveleddThe current group real-time electric quantity information recorded later is
Then, thenn+At time 1mThe pack real-time battery power information is
. That is, after the vehicle runs for 1 kilometer, the current electric quantity information is recorded again, and the previous time is recorded
Deleting the previous time
Assigned to the current time
At the previous moment
Assigned to the current time
By analogy, the most recently recorded
Is assigned to
. The above updating operation is repeated once every time a new set of data is recorded.
S202, acquiring 50 groups of real-time battery electric quantity information at the current time T every 5 minutes;
s203, according to current time Tm=50 groups of real-time battery power information are calculated according to the formula (2)m×dAverage power consumption over distance;
wherein,
represents the average power consumption at the present time T,
the 1 st real-time battery power information indicating the current time T,
indicates the current time TmReal-time battery power information. Generally, the unit of average power consumption needs to be converted into kWh/100km for calculation convenience.
S204, comparing the current timemPack real-time battery power information
The battery power information at the current moment is used as the battery power information at the current moment, and the battery power information at the current moment and the average power consumption are used for estimating according to the formula (3) to obtain the endurance mileage;
wherein,bthe influence factor is related to the temperature of the motor, the temperature of the motor controller MCU and the total voltage of the power battery. In generalbThe value range of (1) is 0-1, and when the temperature is overhighOr when the voltage is too low, the voltage is low,b=0 (i.e. high pressure directly, corresponding to a vehicle shut-off); when the temperature exceeds the warning value or the voltage exceeds the warning value, the power is linearly reduced according to the voltage,bthe value decreases from 1, the lower the voltage,bthe smaller the value.
S205, filtering the estimated endurance mileage and displaying the filtered endurance mileage on the instrument, wherein the filtering process specifically comprises the following steps:
the estimated endurance mileageR C And the current endurance mileage displayed by the instrumentR O Comparing to obtain a comparison resultX=R C -R O ；
If it isX≥0Then distance traveledD1 after make the current instrument display continuation of the journey mileageR O -1; if it isX<0Then distance traveledD2 after make the continuation of the journey mileage that the present instrument showsR O -1; wherein,
，D1 andD2 is a real number.
In practical application, as an implementation mode, the content is less than or equal to 25 ≦XIf the driving mileage displayed by the instrument for driving 2.5 kilometers is reduced by 1 kilometer;
if the ratio is less than or equal to 20XIf the driving distance is less than 25, the driving range displayed by the instrument running for 2.2 kilometers is reduced by 1 kilometer;
if X is more than or equal to 15 and less than 20, the endurance mileage displayed by the instrument running for 1.8 kilometers is reduced by 1 kilometer;
if the content is less than or equal to 10XIf the driving distance is less than 15, the driving range displayed by the instrument running for 1.5 kilometers is reduced by 1 kilometer;
if the content is less than or equal to 5XIf the driving distance is less than 10, the driving range displayed by the instrument running for 1.3 kilometers is reduced by 1 kilometer;
if 0 is less than or equal toXIf the driving distance is less than 5, the driving mileage displayed by the instrument driving 1.1 kilometer is reduced by 1 kilometer;
if-5 is less than or equal toXIf the driving range is less than 0, the driving range displayed by the instrument of 0.9 kilometer is reduced by 1 kilometer;
if-10 is less than or equal toXIf less than-5, the vehicle can run for 0.8 kilometerThe endurance mileage displayed by the meter is reduced by 1 kilometer;
if-15 is less than or equal toXIf less than-10, the driving mileage displayed by the instrument of 0.6 kilometer is reduced by 1 kilometer;
if it isXAnd when the driving distance is less than or equal to-15 kilometers, the driving mileage displayed by the instrument for driving 0.4 kilometers is reduced by 1 kilometer.
The endurance mileage displayed by the meter changes according to the judgment conditions, and the purpose of no jump is achieved.
The parameters continuously approach the real endurance mileage by continuously adjusting the variation speed of the endurance mileage displayed by the instrument according to the current road condition and vehicle information, and the parameters cannot jump to cause the driver to feel the discomfort.
Namely, if the estimated endurance mileage is larger than the endurance mileage displayed by the current instrument, the variation of the endurance mileage displayed by the instrument is slow; and if the estimated endurance mileage is less than the endurance mileage displayed by the current instrument, the endurance mileage displayed by the instrument changes rapidly.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. An electric vehicle endurance mileage estimation method based on average power consumption is characterized by comprising the following steps of:
step 1, every driving distancedRecording a group of real-time battery electric quantity information as the current group of real-time battery electric quantity information, and utilizing the current group of real-time battery electric quantity information to the previous momentmUpdating the real-time battery electric quantity information; the current group of real-time electric quantity information is utilized to the previous momentmThe updating of the real-time battery power information specifically comprises the following steps: definition ofnOf time of daymThe real-time battery power information is
Distance traveleddThe later time is recorded asn+Time 1, distance traveleddThe current real-time electric quantity information recorded later is
Then, thenn+At time 1mThe real-time battery power information is
；
Step 2, obtaining the current time at preset time intervalsmReal-time battery power information;
step 3, according to the current timemThe real-time battery power information is calculatedm×dAverage power consumption over distance; the method specifically comprises the following steps: is calculated according to the formula (2)m×dAverage power consumption over distance:
wherein,
represents the average power consumption at the present time T,
the 1 st real-time battery power information indicating the current time T,
indicates the current time TmReal-time battery power information;
step 4, the first time of the current timemThe real-time battery electric quantity information is used as the current battery electric quantity information and is estimated by using the current battery electric quantity information and the average power consumptionEndurance mileage;
step 5, filtering the estimated cruising mileage and displaying the filtered cruising mileage on an instrument; the filtering of the estimated endurance mileage specifically comprises:
the estimated endurance mileageR C And the current endurance mileage displayed by the instrumentR O Comparing to obtain a comparison resultX=R C -R O ；
If it isX≥0Then distance traveledD1 after make the current instrument display continuation of the journey mileageR O -1; if it isX<0Then distance traveledD2 mileage displayed by current instrumentR O -1; wherein,
，D1 andD2 is a real number.
2. The method of claim 1, wherein the real-time battery charge information is calculated according to equation (1):
wherein,arepresenting an influence factor, and being related to the temperature of the power battery and the monomer pressure difference;SOCrepresenting the percentage of the residual capacity of the power battery;SOHrepresenting the state of health of the power battery;SOEindicating the energy state of the power cell.
3. The method of claim 1, wherein the range in step 4 is calculated according to equation (3):
wherein,bin order to influence the factors, it is preferred that,is related to the temperature of the motor, the temperature of the motor controller MCU and the total voltage of the power battery.
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| CN110435480B (en) * | 2019-07-15 | 2021-03-30 | 中国第一汽车股份有限公司 | Remaining mileage determining method and device and vehicle |
| CN110726566B (en) * | 2019-10-23 | 2021-04-06 | 重庆长安汽车股份有限公司 | Method for estimating endurance mileage of electric vehicle |
| CN111422099B (en) * | 2020-04-13 | 2021-12-03 | 宁波吉利汽车研究开发有限公司 | Endurance mileage estimation method for pure electric vehicle |
| CN111546941B (en) * | 2020-04-27 | 2021-11-30 | 中国第一汽车股份有限公司 | Method and device for determining remaining mileage of vehicle, vehicle and storage medium |
| CN112622619A (en) * | 2020-12-17 | 2021-04-09 | 江苏开沃汽车有限公司 | Display method of code-breaking screen instrument |
| CN114475257B (en) * | 2022-01-25 | 2023-07-11 | 中通客车股份有限公司 | Method and system for calculating driving range of pure electric bus |
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