A serial-parallel hybrid energy vehicle endurance calculation method

Abstract

The application provides a kind of serial-parallel hybrid energy vehicle's endurance calculation method, the method comprises: obtaining the mapping table of oil tank oil level and tank oil volume, the total capacity of tank oil is calculated, and the fuel level percentage is obtained according to the oil level sent by instrument processing;Respectively calculate the electricity consumption per mile and the oil consumption per mile;Obtain the driving information of hybrid energy vehicle, calculate the average electricity consumption of recent mileage and / or the average oil consumption of recent mileage according to the electricity consumption per mile and / or the oil consumption per mile;The average electricity consumption of recent mileage and / or the average oil consumption of recent mileage are used for fuel endurance mileage and / or pure electric endurance mileage calculation, in comprehensive consideration oil-electricity cooperation, driving habit, road condition and other factors, using weighted average method, by introducing deviation value alpha and beta, the endurance mileage of hybrid energy vehicle is accurately calculated.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and more specifically, to a method for calculating the range of a series-parallel hybrid electric vehicle. Background Technology

[0002] Traditional gasoline vehicles calculate fuel consumption per unit based on engine fuel injection quantity, and then calculate driving range based on fuel tank level signal. However, the fuel tank percentage signal itself is inaccurate, leading to errors in the driving range calculation. Pure electric vehicles calculate energy consumption per unit based on battery pack voltage and current, and then calculate pure electric range based on battery pack SOC or remaining charge. For series-parallel hybrid vehicles, the generator, engine, and drive motor work together. The engine can charge the battery through the generator, and the drive motor can charge the battery pack. This results in large fluctuations in energy and fuel consumption per unit distance, making the traditional separate calculation method unsuitable. Traditional methods are insufficient to accurately reflect actual energy consumption levels.

[0003] In addition, hybrid vehicles generally have lower fuel consumption than gasoline vehicles of the same specifications, and are significantly affected by factors such as driving habits and road conditions. With the same amount of fuel in the tank or at the top of the tank, the driving range will be longer. The lag and inaccuracy of the fuel tank level signal further affect the accuracy of the driving range. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method for calculating the range of a series-parallel hybrid electric vehicle, thereby solving the problems of inaccurate energy consumption and range calculations in existing hybrid vehicles, such as large fluctuations in energy consumption, inaccurate range display, and delayed fuel level signals.

[0005] To achieve the above technical effects, the present invention provides a method for calculating the range of a series-parallel hybrid electric vehicle, comprising the following steps:

[0006] S1. Obtain the mapping table between the fuel level in the fuel tank and the fuel volume in the fuel tank, calculate the total fuel capacity in the tank, and process the fuel level data sent by the instrument to obtain the fuel level percentage.

[0007] S2. Calculate the electricity consumption and fuel consumption per unit mileage of the car respectively;

[0008] S3. Obtain driving information of hybrid new energy vehicles, and calculate the average energy consumption and / or average fuel consumption of recent mileage based on the energy consumption per unit mileage and / or fuel consumption per unit mileage.

[0009] S4. Use the recent average mileage energy consumption and / or recent average mileage fuel consumption mentioned in step S3 to calculate the fuel range and / or pure electric range.

[0010] Standard fuel range = percentage of treated fuel level × (full tank range – deviation β) – deviation α;

[0011] Deviation value α = Σ(actual fuel consumption per unit kilometer / (announced fuel consumption × correction factor)) – percentage drop in fuel level Δ × (range on a full tank – deviation value β);

[0012] The deviation value β is initialized to 0 when the fuel level percentage is 100%. When the fuel level percentage on the instrument drops from 100% for the first time, the current deviation value α is assigned to the deviation value β, and the deviation value α is cleared to zero and accumulated again.

[0013] Furthermore, the energy consumption per unit mile is calculated based on battery pack voltage, current, SOC, and remaining power information, combined with vehicle speed, through integral calculation or power difference calculation.

[0014] Furthermore, the fuel consumption per unit mileage is calculated based on the engine fuel injection quantity, the fuel level data of the instrument panel, and the vehicle speed.

[0015] Furthermore, the formula for calculating dynamic fuel range is as follows:

[0016] Dynamic fuel range = (Fuel level percentage after treatment) * (Tank volume) / (Recent average fuel consumption) * 100.

[0017] Furthermore, the standard pure electric driving range calculation formula is as follows:

[0018] Standard pure electric range = (battery pack SOC – reserved SOC) × full charge range as announced.

[0019] Furthermore, the formula for calculating the dynamic pure electric range is as follows:

[0020] Dynamic pure electric range = (remaining available battery power - reserved power) / recent average power consumption per mile * 100.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The method for calculating the range of new energy vehicles provided by this invention establishes a mapping table between fuel level and fuel volume by modeling the fuel tank. This method can be adapted to different fuel tank structures and obtain accurate fuel level percentages. It also takes into account the fuel level at the top of the tank and the fuel capacity at the top of the tank under normal and natural refueling conditions. At the same time, it ensures the applicability of the algorithm and allows for the creation of different mapping tables based on the fuel tank structure of different vehicle models.

[0023] The method for calculating the range of new energy vehicles provided by this invention comprehensively considers factors such as oil-electric synergy, driving habits, and road conditions, and adopts a weighted average method by introducing deviation values ​​α and β to accurately calculate the range of hybrid energy vehicles.

[0024] The new energy vehicle range calculation method provided by this invention addresses the issue of lag in fuel level percentage updates due to physical limitations of the fuel tank level sensor and the timeliness of the filtering algorithm. In standard fuel range calculations, the actual fuel consumption per unit kilometer is calculated and then divided by the officially advertised fuel consumption to obtain a proportional value. Simultaneously, with a constant fuel level, the deviation α of the displayed range per unit kilometer is accumulated and added to this proportional value. When the fuel level decreases, the corresponding proportional value is subtracted. This allows for real-time updates to the displayed range value even with a constant fuel level, ensuring that accumulated errors are promptly corrected and range calculations are more accurate.

[0025] The new energy vehicle range calculation method provided by this invention sets calibration parameters in the calculation. The development of different models only requires changing a few calibration parameters and mapping tables to adapt to the new energy vehicle, and is compatible with standard and dynamic range calculations and switching. Attached Figure Description

[0026] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 A system block diagram for implementing a calculation method according to an embodiment of the present invention;

[0028] Figure 2 This is a flowchart illustrating the calculation of fuel consumption per unit mileage according to an embodiment of the present invention;

[0029] Figure 3 This is a flowchart illustrating the calculation of energy consumption per unit mileage according to an embodiment of the present invention;

[0030] Figure 4 This is a flowchart illustrating the calculation of average energy consumption (electricity consumption and fuel consumption) according to an embodiment of the present invention;

[0031] Figure 5 This is a flowchart illustrating the calculation of the deviation value α according to an embodiment of the present invention;

[0032] Figure 6 This is a flowchart illustrating the calculation of the deviation value β according to an embodiment of the present invention; Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, all directional indications (such as up, down, left, right, front, back, bottom, etc.) in this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indication will also change accordingly. Furthermore, descriptions involving "first," "second," etc., in this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0036] This embodiment provides a method for calculating energy consumption and range of a series-parallel hybrid electric vehicle, applied to hybrid electric vehicles. The system modules that execute this calculation method are as follows: Figure 1 As shown. The specific calculation method is as follows:

[0037] Step 1: Model the fuel tank of the hybrid vehicle and establish a mapping table between the fuel level and the fuel volume in the tank. Based on the fuel level under normal and natural refueling conditions, and considering the fuel level at the top of the tank, process the fuel level sent by the instrument to obtain the processed fuel level percentage.

[0038] Step 2: Calculate the energy consumption per unit mileage based on the voltage, current, SOC, remaining charge data, and vehicle speed information sent by the hybrid vehicle's battery pack. Calculate the fuel consumption per unit mileage based on the fuel injection data, instrument panel fuel level information, and vehicle speed information sent by the engine management system. In other embodiments not shown, energy consumption can also be calculated using the voltage, current data, and efficiency of the electricity consumption unit. In this embodiment, the unit mileage is set to 1 km. In other embodiments not shown, the unit mileage can be set to other numbers as needed, such as 0.5 km or other values, to adapt to different unit mileage precision.

[0039] Step 3: Calculate the average energy consumption and average fuel consumption over the last 50 kilometers based on the hybrid vehicle's driving information and the calculated energy consumption and fuel consumption per unit mileage.

[0040] Step 4: Finally, use the average electricity consumption and average fuel consumption over the last 50 kilometers from Step 3 to calculate the fuel-powered driving range and the pure electric driving range. Wherein:

[0041] (1) Standard fuel range = percentage of fuel level after treatment × (full fuel range – deviation β) - deviation α.

[0042] ① Regarding the determination and utilization of the deviation value α, such as Figure 6 As shown, when the fuel level starts to drop, α=0. When the unit mileage is reached, let α=α+actual fuel consumption per unit kilometer / (announced fuel consumption*correction coefficient). At the same time, it is determined whether the fuel level has dropped. If the fuel level drops, the deviation value α=α-percentage drop in fuel level Δ*(announced range on a full tank – deviation value β).

[0043] Therefore, the deviation value α = ∑ (actual fuel consumption per unit mileage / (announced fuel consumption * correction coefficient)) − percentage drop in fuel level Δ * (announced range on a full tank – deviation value β), where the actual fuel consumption per unit mileage is obtained by integrating the fuel injection quantity data.

[0044] The correction factor refers to the deviation factor between actual road fuel consumption and announced fuel consumption. It is a percentage deviation factor based on a large amount of data and empirical road conditions.

[0045] ②For example Figure 5 As shown, the deviation value β is 0 when the fuel level percentage is 100%. When the fuel level percentage on the instrument drops from 100% for the first time, the value of the deviation value α is assigned to the deviation value β, and the deviation value α is cleared to zero and α is accumulated again.

[0046] The standard fuel range calculation takes into account the range update situation when the fuel level remains unchanged, which can solve the fuel range calculation when the fuel level at the top of the tank remains unchanged and when the fuel level reaches 0 and the ballast fuel is consumed.

[0047] (2) Dynamic fuel range = percentage of fuel level after treatment * fuel tank volume / average energy consumption of the last 50 kilometers (unit L / 100km) * 100.

[0048] (3) Standard pure electric range = (battery pack SOC – reserved SOC) * full charge announcement range

[0049] (4) Dynamic pure electric range = (remaining available power of battery pack - reserved power) / average energy consumption of the last 50 kilometers (unit kwh / 100km) * 100.

[0050] refer to Figure 2 Regarding the fuel consumption per unit mileage in step 2, the calculation method is as follows:

[0051] S21: Determine if the vehicle is driving; if not, stop accumulating mileage and fuel consumption. S22: If yes, start accumulating mileage and fuel consumption.

[0052] S23: Determine if the cumulative mileage is equal to the unit kilometer; otherwise, return to S1.

[0053] S24: If so, save the cumulative fuel consumption and obtain the fuel consumption per unit mileage.

[0054] refer to Figure 3 Regarding the unit mileage power consumption in step 2, the calculation method is as follows:

[0055] S31: Determine if the vehicle is driving; otherwise, stop accumulating mileage and energy consumption.

[0056] S32: If so, start accumulating mileage and energy consumption;

[0057] S33: Determine if the cumulative mileage is equal to the unit kilometer; otherwise, return to S1.

[0058] S34: If so, save the cumulative power consumption and obtain the power consumption per unit distance.

[0059] refer to Figure 4 Regarding step 3, the average energy consumption calculation process, the average energy consumption calculation includes calculating average fuel consumption or average electricity consumption. In this embodiment, the recent mileage is set to 50 kilometers. In other embodiments not shown, the recent mileage can also be set to different mileages as needed. The average fuel consumption calculation process is as follows:

[0060] S41: Determine whether the vehicle has achieved the calculated fuel consumption per unit kilometer; otherwise, maintain the average fuel consumption of the previous moment.

[0061] S42: If fuel consumption per unit kilometer is calculated, then obtain the average fuel consumption before weighting;

[0062] S43: Determine if the current total mileage is ≤50KM; otherwise, directly calculate the average fuel consumption without weighting.

[0063] S44: If so, the average fuel consumption is calculated by weighting it with the advertised energy consumption.

[0064] The average power consumption is calculated in the same way as the average energy consumption. By using a weighted calculation method, it can adapt to situations where the cumulative mileage has not reached the recent mileage and gradually approach the actual average energy consumption at the recent mileage.

[0065] The specific embodiments of the present invention have been described above. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. A method for calculating the range of a series-parallel hybrid electric vehicle, characterized in that, Includes the following steps: S1. Obtain the mapping table between the fuel tank level and the fuel volume in the fuel tank, calculate the total fuel capacity in the tank, and process the fuel level data sent by the instrument to obtain the fuel level percentage. S2. Calculate the electricity consumption per unit mileage and the fuel consumption per unit mileage respectively; S3. Obtain the driving information of the hybrid energy vehicle and calculate the average energy consumption and / or average fuel consumption of the recent mileage based on the energy consumption per unit mileage and / or fuel consumption per unit mileage. S4. Use the recent average mileage energy consumption and / or recent average mileage fuel consumption mentioned in step S3 to calculate the fuel range and / or pure electric range. Standard fuel range = percentage of treated fuel level × (full tank range – deviation β) – deviation α; Deviation value α = Σ(actual fuel consumption per unit kilometer / (announced fuel consumption × correction factor)) – percentage drop in fuel level Δ × (range on a full tank – deviation value β); The deviation value β is initialized to 0 when the fuel level percentage is 100%. When the fuel level percentage on the instrument drops from 100% for the first time, the current deviation value α is assigned to the deviation value β, and the deviation value α is cleared to zero and accumulated again.

2. The method for calculating the range of a series-parallel hybrid electric vehicle according to claim 1, characterized in that, The energy consumption per unit mile is calculated based on battery pack voltage, current, SOC, and remaining charge information, combined with vehicle speed, through integral calculation or charge difference calculation.

3. The method for calculating the range of a series-parallel hybrid electric vehicle according to claim 1, characterized in that, The fuel consumption per unit mileage is calculated based on the engine fuel injection quantity, the fuel level data on the instrument panel, and the vehicle speed.

4. The method for calculating the range of a series-parallel hybrid electric vehicle according to claim 1, characterized in that, The formula for calculating dynamic fuel range is: Dynamic fuel range = percentage of treated fuel level × fuel tank capacity / average fuel consumption over recent mileage × 100.

5. The method for calculating the range of a series-parallel hybrid electric vehicle according to claim 1, characterized in that, The standard pure electric driving range calculation formula is: Standard pure electric range = (battery pack SOC – reserved SOC) × full charge range as announced.

6. The method for calculating the range of a series-parallel hybrid electric vehicle according to claim 1, characterized in that, The formula for calculating dynamic pure electric range is: Dynamic pure electric range = (remaining available battery power - reserved power) / recent average power consumption per mile × 100.

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