Method for estimating the range of a pure electric vehicle

Abstract

This invention relates to the field of automotive control methods, specifically to a method for estimating the driving range of a pure electric vehicle. The method comprises the following steps: S1, obtaining the real-time power consumption and remaining battery power of the vehicle's auxiliary components; S2, dividing the vehicle's historical mileage into short and long mileage segments according to a set distance, and calculating the average motor power consumption for the short and long mileage segments respectively; S3, calculating the current average motor power consumption based on the average motor power consumption for the short and long mileage segments and their respective weighting coefficients; S4, calculating the remaining driving range of the electric vehicle based on the current average motor power consumption, remaining battery power, and real-time power consumption of the auxiliary components. The method for estimating the driving range of a pure electric vehicle in this application is simple. By distinguishing between short and long mileage segments and calculating the average motor power consumption for each segment, the final driving range is calculated. This method considers the power consumption characteristics of the motor under different mileage segments, resulting in a more accurate calculation.

Description

Technical Field

[0001] This invention relates to the field of automotive control methods, specifically to a method for estimating the driving range of a pure electric vehicle. Background Technology

[0002] One major drawback of pure electric vehicles is range anxiety, primarily because current lithium-ion battery technology cannot accommodate enough batteries within a given space to match the range of gasoline-powered vehicles. Another crucial reason is the significant error in estimating the remaining range of pure electric vehicles, which can easily lead drivers to misjudge the actual range and cause them to break down on the road.

[0003] To accurately estimate the remaining driving range of pure electric vehicles, a Chinese invention patent with patent number "CN201910467476.9" entitled "A Method for Estimating the Driving Range of Pure Electric Vehicles" describes a method for estimating the driving range of pure electric vehicles. The method includes: calculating a first drivable range DrvRng1 based on battery state information and a second drivable range DrvRng2 based on the user's driving history mileage data; calculating the drivable range DrvRng displayed on the instrument panel, DrvRng = DrvRng1*ζ1 + DrvRng2*ζ2, where ζ1 and ζ2 are weighting coefficients for the drivable range. This invention automatically updates and learns based on the driver's long-term driving experience, thereby obtaining accurate drivable range data based on the driver's driving habits. The above method mainly calculates the driving range of the electric vehicle corresponding to the SOC interval based on the SOC interval. However, in reality, the power consumption of the motor in a pure electric vehicle is completely different during daily driving, whether it is short-distance or long-distance. Short-distance driving is usually daily commuting in the city, which involves many stopping, waiting, and acceleration processes, making it intermittent and discontinuous. Long-distance driving, on the other hand, is more often on highways or urban expressways, with fewer start-stop processes, and the speed can be maintained at a high level continuously. The power consumption of the motor is completely different in these two situations. If one mileage state is used to calculate the range of another mileage state, it is obviously inaccurate. Therefore, there is an urgent need for a method that can accurately calculate the range of pure electric vehicles. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the aforementioned background technology and provide a method for estimating the driving range of a pure electric vehicle.

[0005] The technical solution of the present invention is: a method for estimating the driving range of a pure electric vehicle, comprising the following steps: S1, obtaining the real-time power consumption and remaining power of the vehicle's auxiliary components;

[0006] S2. Divide the vehicle's historical mileage into short mileage and long mileage according to the set distance, and calculate the average power consumption of the motor for short mileage and the average power consumption of the motor for long mileage respectively.

[0007] S3. Calculate the current average power consumption of the motor based on the average power consumption of the short-mileage motor and the average power consumption of the long-mileage motor, as well as their respective weighting coefficients.

[0008] S4. Calculate the remaining driving range of the electric vehicle based on the current average power consumption of the motor, the remaining battery power, and the real-time power consumption of the auxiliary components.

[0009] According to the method for estimating the driving range of a pure electric vehicle provided in this application, in step S2, the method of dividing the vehicle's historical driving mileage into short mileage and long mileage according to a set distance includes: setting the previous mileage of the current trip to be less than the set distance as short mileage, and setting the previous mileage of the current trip to be greater than or equal to the set distance as long mileage.

[0010] According to the method for estimating the driving range of a pure electric vehicle provided in this application, the method for calculating the average power consumption of the motor during short-range trips in step S2 includes: calculating the reduction in battery power and the power consumption of the first auxiliary component during the previous short-range trip; the ratio of the first mileage of the previous short-range trip to the difference between the reduction in battery power and the power consumption of the first auxiliary component is the average power consumption of the motor during short-range trips.

[0011] According to the method for estimating the driving range of a pure electric vehicle provided in this application, the method for calculating the average power consumption of the motor over long distances in step S2 includes: calculating the power reduction of the second battery and the power consumption of the second auxiliary component during the previous long distance trip; the ratio of the second mileage of the previous long distance trip to the difference between the power reduction of the second battery and the power consumption of the second auxiliary component is the average power consumption of the motor over long distances.

[0012] According to the method for estimating the driving range of a pure electric vehicle provided in this application, the method for dividing the vehicle's historical driving mileage into short mileage and long mileage according to a set distance in step S2 includes: counting all historical trips before the current trip, setting trips with mileage less than the set distance as short mileage, and setting trips with mileage greater than or equal to the set distance as long mileage.

[0013] According to the method for estimating the driving range of a pure electric vehicle provided in this application, the method for calculating the average power consumption of the motor in step S2 includes: counting the short mileage in all historical trips before the current trip, calculating the third mileage number superimposed on all short mileages, calculating the power reduction of the third battery and the power consumption of the third auxiliary components within all short mileages, and the ratio of the third mileage number to the difference between the power reduction of the third battery and the power consumption of the third auxiliary components is the average power consumption of the motor in the short mileage.

[0014] According to the method for estimating the driving range of a pure electric vehicle provided in this application, the method for calculating the average power consumption of the motor over long distances in step S2 includes: counting the long distances in all historical trips before the current trip, calculating the fourth mileage number superimposed on all long distances, calculating the power reduction of the fourth battery and the power consumption of the fourth auxiliary components within all long distances, and the ratio of the fourth mileage number to the difference between the power reduction of the fourth battery and the power consumption of the fourth auxiliary components is the average power consumption of the motor over long distances.

[0015] According to the method for estimating the driving range of a pure electric vehicle provided in this application, step S3, which calculates the current average power consumption of the motor based on the average power consumption of the motor over short and long ranges and their respective weighting coefficients, includes: calculating the current average power consumption of the motor according to the following formula.

[0016] W a =αW s +(1-α)W l

[0017] Among them: W a —Current average power consumption of the motor;

[0018] W s —Average power consumption of motors with short range;

[0019] W l —Average power consumption of long-distance motors;

[0020] α — Weighting coefficient.

[0021] According to the method for estimating the driving range of a pure electric vehicle provided in this application, step S4, which calculates the remaining driving range of the electric vehicle based on the current average power consumption of the motor, the remaining battery power, and the real-time power consumption of auxiliary components, includes:

[0022] Calculate the remaining driving range of an electric vehicle using the following formula.

[0023]

[0024] Where: D—remaining driving range of the electric vehicle;

[0025] W a —Current average power consumption of the motor;

[0026] W f —Real-time power consumption of auxiliary components;

[0027] E – Remaining charge of the power battery.

[0028] According to the method for estimating the driving range of a pure electric vehicle provided in this application, the calculation method of the weighting coefficient α includes:

[0029] Calculate the total mileage of all historical trips prior to this trip, and then calculate the fifth mileage for each short mileage in the historical trips. The ratio of the fifth mileage to the total mileage is α.

[0030] Alternatively, count the sixth mileage of all short mileages within the set mileage before this trip, and the ratio of the sixth mileage to the set mileage is α.

[0031] The advantages of this application are: 1. This application divides the historical mileage of a pure electric vehicle into short mileage and long mileage, calculates the average power consumption of the motor for short mileage and long mileage respectively, then calculates the current average power consumption of the motor based on the calculated average power consumption of the motor, and finally calculates the remaining driving range of the electric vehicle based on the current average power consumption of the motor. This calculation method fully considers the different power consumption of the motor under short mileage and long mileage. In any case, it can accurately calculate the driving range of the pure electric vehicle, and the calculation method is simple and the calculation efficiency is extremely high.

[0032] 2. This application divides historical mileage into short mileage and long mileage by setting a distance for the mileage. The division method is extremely simple. In addition, this application takes into account the previous short mileage and the previous long mileage of the current trip, which can accurately reflect the current operation of the pure electric vehicle.

[0033] 3. The calculation method for the average power consumption of short-mileage motors and the average power consumption of long-mileage motors in this application is very simple. The average power consumption of short-mileage motors can be obtained by the ratio of the first mileage traveled to the difference between the power reduction of the first battery and the power consumption of the first auxiliary component. The average power consumption of long-mileage motors can be obtained by the ratio of the second mileage traveled to the difference between the power reduction of the second battery and the power consumption of the second auxiliary component. The calculation is simple and convenient.

[0034] 4. This application also has another method for dividing short mileage and long mileage. This application divides the historical mileage before the current trip into short mileage and long mileage. This allows for the analysis and calculation of the average power consumption of the motor during all the processes of motor operation, which is equivalent to calculating the power consumption of the motor from the total historical mileage. The calculation result is accurate.

[0035] 5. In the above-mentioned method of dividing short and long mileage, this application analyzes and calculates by superimposing the mileage of all short mileage and the mileage of all long mileage, and finally obtains the average power consumption of short mileage motor and the average power consumption of long mileage motor. The calculation method is simple and the logic is clear.

[0036] 6. This application calculates the current average power consumption of the motor based on the average power consumption of the motor over short distances and the average power consumption of the motor over long distances. By weighting the average power consumption of the motor over short distances and the average power consumption of the motor over long distances respectively, the accurate average power consumption of the motor over the current distance is obtained. The calculation scheme is simple and efficient.

[0037] 7. This application calculates the remaining driving range of the electric vehicle by using the current average power consumption of the motor, the remaining battery power, and the real-time power consumption of the auxiliary components. The calculation method is extremely simple. Because the current average power consumption of the motor can accurately reflect the current power consumption of the motor compared with the prior art, this application can obtain a more accurate remaining driving range of the electric vehicle.

[0038] 8. This application has determined the weighting coefficient in two ways. One way is to count the historical mileage and then obtain the weighting coefficient by the proportion of the short mileage counted to the total mileage. The other way is to count the short mileage within the set mileage before the current trip and then obtain the weighting coefficient by the proportion of the short mileage counted to the total mileage. Both methods are simple and can reflect the driving situation of the vehicle, truly obtain the operating status of the vehicle's motor, and obtain a more accurate driving range.

[0039] The method for estimating the driving range of pure electric vehicles in this application is simple. By distinguishing between short and long driving ranges and calculating the average power consumption of the motor under short and long driving ranges respectively, the driving range is finally calculated. This method fully considers the power consumption characteristics of the motor under different driving ranges, and the calculation results are more accurate and have great promotional value. Attached Figure Description

[0040] Figure 1 This application includes a flowchart of a method for estimating the remaining driving range of a pure electric vehicle. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0045] like Figure 1 As shown, this application relates to a method for estimating the driving range of a pure electric vehicle. The method divides the historical driving mileage of the pure electric vehicle into short-mileage and long-mileage segments, calculates the average power consumption of the motor in the short-mileage segment and the average power consumption of the motor in the long-mileage segment respectively, then calculates the current average power consumption of the motor based on the calculated average power consumption of the motor in the short-mileage and long-mileage segments, and finally calculates the driving range of the power battery based on the current average power consumption of the motor. The entire calculation method fully considers the power consumption of the motor in the short-mileage driving state and the long-mileage driving state, and the calculation result is more accurate.

[0046] Specifically, follow these steps:

[0047] S1. Obtain the real-time power consumption and remaining battery power of the vehicle's auxiliary components;

[0048] S2. Divide the vehicle's historical mileage into short mileage and long mileage according to the set distance, and calculate the average power consumption of the motor for short mileage and the average power consumption of the motor for long mileage respectively.

[0049] S3. Calculate the current average power consumption of the motor based on the average power consumption of the short-mileage motor and the average power consumption of the long-mileage motor, as well as their respective weighting coefficients.

[0050] S4. Calculate the remaining driving range of the electric vehicle based on the current average power consumption of the motor, the remaining battery power, and the real-time power consumption of the auxiliary components.

[0051] Because this application is based on the short and long mileage data in the vehicle's historical mileage, it has made targeted calculations for this situation, so that the calculation of the vehicle's remaining range at the current mileage takes into account the vehicle's driving habits, and can more accurately obtain the vehicle's remaining range, resulting in more accurate calculation results.

[0052] The set distance in this application is obtained through calibration, with a value range of 5km to 10km. The specific value can be obtained by conducting road tests based on the vehicle's condition, road conditions, and the temperature in the daily driving area. After obtaining the set distance, it is stored in the vehicle controller and can be directly called up when needed.

[0053] The real-time power consumption of auxiliary components in this application refers to the power consumption of electrical equipment in the vehicle other than the motor, such as air conditioners. These auxiliary components have controllers that calculate their own energy consumption and then send it to the vehicle controller via the bus.

[0054] In step S2 above, there are two methods for dividing the vehicle's historical mileage into short mileage and long mileage according to the set distance. The first method is to collect the previous trip or several trips before the current trip, and set the trips where the previous mileage of the current trip is less than the set distance as short mileage, and the trips where the previous mileage of the current trip is greater than or equal to the set distance as long mileage.

[0055] The second method involves analyzing all historical trips prior to the current trip, designating trips with a mileage less than a set distance as short mileage trips, and trips with a mileage greater than or equal to the set distance as long mileage trips.

[0056] For example, if a certain historical trip in this trip is 25km, which is greater than the set distance (assuming the set distance is 5km), then the trip can be judged as a long distance. If a certain historical trip is 4km, then the historical trip can be judged as a short distance. In fact, there may be multiple consecutive historical trips that are either long or short distances.

[0057] The first method considers the historical journey closest to the current journey, which accurately reflects the motor's recent operating status. The second method considers all historical journeys before the current journey, providing a comprehensive overview of the motor's operating status before the current journey.

[0058] For the first classification method, the method for calculating the average power consumption of the short-range motor and the average power consumption of the long-range motor is as follows: Calculate the reduction in battery power and the power consumption of the first auxiliary component during the previous short-range trip. The ratio of the first mileage of the previous short-range trip to the difference between the reduction in battery power and the power consumption of the first auxiliary component is the average power consumption of the short-range motor, expressed by the formula:

[0059]

[0060] Among them: W s —Average power consumption of motors with short range;

[0061] L l —First mileage;

[0062] e s1 —The first battery is losing power;

[0063] e1 — Power consumption of the first auxiliary component;

[0064] The average power consumption of the motor over the previous long-distance trip is calculated by dividing the previous long-distance trip's mileage by the difference between the battery's power reduction and the auxiliary component's power consumption. This is expressed by the formula:

[0065]

[0066] Among them: W l —Average power consumption of long-distance motors;

[0067] L2 – Second Mileage;

[0068] e s2 —The second battery reduces its power;

[0069] e2 — Power consumption of the second auxiliary component.

[0070] For the second classification method, the method for calculating the average power consumption of the short-mileage motor and the average power consumption of the long-mileage motor is as follows: Collect all short-mileage trips in all historical trips prior to the current trip, calculate the third mileage number accumulated from all short-mileage trips, calculate the power reduction of the third battery and the power consumption of the third auxiliary components within all short-mileage trips, and the ratio of the third mileage number to the difference between the power reduction of the third battery and the power consumption of the third auxiliary components is the average power consumption of the short-mileage motor, expressed by the formula:

[0071]

[0072] Among them: W s —Average power consumption of motors with short range;

[0073] L3 – Third Mileage;

[0074] e s3 —The third battery reduces its power;

[0075] e3 — Power consumption of the third auxiliary component;

[0076] The system calculates the total mileage of all historical trips prior to this trip, including the fourth mileage count, the reduction in battery power, and the power consumption of auxiliary components within each long mileage. The ratio of the fourth mileage count to the difference between the reduction in battery power and the power consumption of auxiliary components is the average power consumption of the motor over the long mileage, expressed by the formula:

[0077]

[0078] Among them: W l —Average power consumption of long-distance motors;

[0079] L4 – Fourth Mileage;

[0080] es4 —The fourth battery reduces its power;

[0081] e4 - The fourth auxiliary component consumes power.

[0082] By obtaining the average power consumption of the motor over short and long distances, the current average power consumption of the motor can be calculated. Specifically, the current average power consumption of the motor can be calculated using the following formula:

[0083] W a =αW s +(1-α)W l

[0084] Among them: W a —Current average power consumption of the motor;

[0085] W s —Average power consumption of motors with short range;

[0086] W l —Average power consumption of long-distance motors;

[0087] α — Weighting coefficient.

[0088] The weighting coefficient α in this application can be determined in two ways. One method is to calculate the total mileage of all historical trips prior to the current trip, and then calculate the fifth mileage of all short trips within those historical trips. The ratio of this fifth mileage to the total mileage is α. This method is equivalent to determining the current driving habits of the vehicle by analyzing historical trips, and then determining the weight of short and long mileages based on these driving habits. For example, if the vehicle's historical mileage before this trip is 10,000 km, and the fifth mileage of short trips is 6,000 km, then α is calculated to be 0.6. The other method is to calculate the sixth mileage of all short trips within a set mileage range prior to the current trip, and then calculate the ratio of this sixth mileage to the set mileage. This method analyzes the driving habits within the set mileage range prior to the current trip, reflecting driving habits over a period of time before the current trip. The set mileage range can be 100 km to 200 km. For example, if the sixth mileage of all short trips within the 100 km range prior to the current trip is 55 km, then α is calculated to be 0.55. Of course, the weighting coefficient α of this application can also be obtained through calibration. After obtaining the specific weighting coefficient, it can be stored in the vehicle controller and called directly when needed.

[0089] After obtaining the current power consumption of the motor, the remaining driving range of the electric vehicle can be calculated based on the current average power consumption of the motor, the remaining battery power, and the real-time power consumption of the auxiliary components. The remaining driving range of the electric vehicle can be calculated using the following formula:

[0090]

[0091] Where: D—remaining driving range of the electric vehicle;

[0092] W a —Current average power consumption of the motor;

[0093] W f —Real-time power consumption of auxiliary components;

[0094] E – Remaining charge of the power battery.

[0095] The pure electric vehicle of this application automatically retrieves historical mileage data after being powered on, and stores the data of the current trip in the vehicle controller after the vehicle is powered off, and updates the historical mileage data so that it can be retrieved for the next trip.

[0096] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for estimating the driving range of a pure electric vehicle, characterized in that: Follow these steps: S1. Obtain the real-time power consumption and remaining battery power of the vehicle's auxiliary components; S2. Divide the vehicle's historical mileage into short mileage and long mileage according to the set distance, and calculate the average power consumption of the motor in short mileage and the average power consumption of the motor in long mileage respectively. The method for calculating the average power consumption of the motor in short mileage includes: calculating the reduction of battery power and the power consumption of auxiliary components in short mileage. The ratio of the short mileage to the difference between the battery power reduction and the power consumption of auxiliary components in short mileage is the average power consumption of the motor in short mileage. S3. Calculate the current average power consumption of the motor based on the average power consumption of the short-mileage motor and the average power consumption of the long-mileage motor, as well as their respective weighting coefficients. The weighting coefficients are the ratio of the short-mileage distance to the total distance and the ratio of the long-mileage distance to the total distance, respectively. S4. Calculate the remaining driving range of the electric vehicle based on the current average power consumption of the motor, the remaining battery power, and the real-time power consumption of the auxiliary components.

2. The method for estimating the driving range of a pure electric vehicle as described in claim 1, characterized in that: In step S2, the method of dividing the vehicle's historical mileage into short mileage and long mileage according to the set distance includes: setting the previous mileage of the current trip to be less than the set distance as short mileage, and setting the previous mileage of the current trip to be greater than or equal to the set distance as long mileage.

3. The method for estimating the driving range of a pure electric vehicle as described in claim 2, characterized in that: In step S2, the method for calculating the average power consumption of the short-mileage motor includes: calculating the reduction in battery power and the power consumption of the first auxiliary component during the previous short-mileage trip. The ratio of the first mileage of the previous short-mileage trip to the difference between the reduction in battery power and the power consumption of the first auxiliary component is the average power consumption of the short-mileage motor.

4. A method for estimating the driving range of a pure electric vehicle as described in claim 2 or 3, characterized in that: In step S2, the method for calculating the average power consumption of the long-mileage motor includes: calculating the power reduction of the second battery and the power consumption of the second auxiliary component during the previous long-mileage trip. The ratio of the second mileage of the previous long-mileage trip to the difference between the power reduction of the second battery and the power consumption of the second auxiliary component is the average power consumption of the long-mileage motor.

5. The method for estimating the driving range of a pure electric vehicle as described in claim 1, characterized in that: In step S2, the method of dividing the vehicle's historical mileage into short mileage and long mileage according to the set distance includes: counting all historical trips before the current trip, setting trips with mileage less than the set distance as short mileage, and setting trips with mileage greater than or equal to the set distance as long mileage.

6. The method for estimating the driving range of a pure electric vehicle as described in claim 5, characterized in that: In step S2, the method for calculating the average power consumption of the short-mileage motor includes: counting the short mileages in all historical trips before the current trip, calculating the third mileage number superimposed on all short mileages, calculating the power reduction of the third battery and the power consumption of the third auxiliary components within all short mileages, and the ratio of the third mileage number to the difference between the power reduction of the third battery and the power consumption of the third auxiliary components is the average power consumption of the short-mileage motor.

7. A method for estimating the driving range of a pure electric vehicle as described in claim 5 or 6, characterized in that: In step S2, the method for calculating the average power consumption of the long-mileage motor includes: counting the long mileage in all historical trips before the current trip, calculating the fourth mileage number superimposed on all long mileages, calculating the power reduction of the fourth battery and the power consumption of the fourth auxiliary component within all long mileages, and the ratio of the fourth mileage number to the difference between the power reduction of the fourth battery and the power consumption of the fourth auxiliary component is the average power consumption of the long-mileage motor.

8. The method for estimating the driving range of a pure electric vehicle as described in claim 1, characterized in that: In step S3, the method for calculating the current average power consumption of the motor based on the average power consumption of the short-mileage motor and the average power consumption of the long-mileage motor, as well as their respective weighting coefficients, includes: calculating the current average power consumption of the motor according to the following formula. Among them: W a —Current average power consumption of the motor; W s —Average power consumption of motors with short range; W l —Average power consumption of long-distance motors; α — Weighting coefficient.

9. The method for estimating the driving range of a pure electric vehicle as described in claim 8, characterized in that: The method for calculating the weighting coefficient α includes: Calculate the total mileage of all historical trips prior to this trip, and then calculate the fifth mileage for each short mileage in the historical trips. The ratio of the fifth mileage to the total mileage is α. Alternatively, count the sixth mileage of all short mileages within the set mileage before this trip, and the ratio of the sixth mileage to the set mileage is α.

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