Method for calculating target value of fuel consumption of passenger car

Abstract

The invention relates to a passenger vehicle fuel consumption target value calculation method, and provides a footprint area-based fuel consumption target value calculation method in order to stabilize the overall fuel consumption target in the automobile industry and encourage the vehicle to develop in the direction of large and light, and the footprint area-based fuel consumption target value calculation method comprises the following steps of: obtaining a relational expression between the footprint area and the curb mass through a linear regression analysis method; the formula is adjusted so that the proportions of the number of the vehicle types of which the fuel consumption target value is strictly increased and the number of the vehicle types of which the fuel consumption target value is relaxed to the total number of sample vehicle types are the same, and the adjusted formula is substituted into a fuel consumption target value calculation formula based on curb mass to obtain a footprint area-based fuel consumption target value calculation formula; the relational expression of the footprint area and the servicing mass is adjusted for the second time, so that the deviation of the industry weighted average fuel consumption target value of the two methods for calculating the fuel consumption target value based on the servicing mass and the footprint area is controlled within 1%; and repeating the iteration process to obtain a final fuel consumption target value calculation formula based on the footprint area.

Description

Technical Field

[0001] The present application relates to the technical field of passenger car fuel consumption calculation methods, and in particular to a passenger car fuel consumption target value calculation method. Background Art

[0002] Passenger car fuel consumption plays a pivotal role in the development of energy-saving and new energy technologies, and is a powerful driving force for the vigorous development of energy-saving and new energy technologies. However, the current passenger car fuel consumption is generally around 6.8L / 100km, which fails to meet the requirements of the new standard of 4.6L / 100km in GB19578-2021 "Passenger Car Fuel Consumption Limits".

[0003] In addition to the slow technological iteration, the increase in the curb weight of passenger vehicles is also an important reason. According to statistics, the average curb weight of new passenger cars in 2021 is 1533kg, an increase of 123kg and 23kg compared with 2017 and 2020 respectively, showing a trend of heavier vehicles. The market's preference for large passenger vehicles and the lack of encouragement for lightweighting in the calculation method of passenger vehicle fuel consumption target values ​​are factors that lead to the increase in the weight of passenger vehicles.

[0004] The target fuel consumption of existing passenger cars is calculated according to the following formula in GB27999-2019:

[0005] CM≤1090, then: T=4.02

[0006] 1090≤CM≤2510, then: T=0.0018×(CM-1415)+4.6

[0007] CM>2510, then: T=6.57

[0008] Where: T represents the target fuel consumption of the vehicle model, in liters per 100 kilometers (L / 100km); CM is the vehicle curb weight, in kilograms (kg).

[0009] It can be concluded from the above formula that the vehicle fuel target value will increase with the increase of the curb weight of the vehicle. This calculation method does not have a strong guiding effect on the lightweighting of passenger cars, because if the fuel consumption target value of the vehicle is directly related to the curb weight of the vehicle, the car manufacturer can design the vehicle by increasing the size and weight of the vehicle while still meeting the fuel consumption standards. Therefore, this calculation method does not give the car manufacturer enough motivation to reduce the weight of the vehicle, which will weaken the incentive effect on vehicle lightweighting. Summary of the invention

[0010] In view of one or more of the problems existing in the prior art, the present application provides a method for calculating a target value of fuel consumption of a passenger car, the method comprising:

[0011] Obtaining sample vehicle data, the vehicle data including vehicle model, number of vehicle models, vehicle model footprint, and actual curb weight;

[0012] The relationship between footprint area and curb weight is obtained by linear regression analysis (2):

[0013] CM=K1×FP-b1 (2)

[0014] Where CM is the vehicle curb mass in kilograms (kg); K1 is the slope of the linear function, b1 is the constant term of the linear function, and FP is the footprint area of ​​the vehicle in square meters (m2). 2 );

[0015] Substitute the footprint area of ​​the vehicle model into formula (2) to obtain the calculated curb weight of each model in the sample vehicle. By adjusting formula (2), the ratio of the number of models with a calculated curb weight higher than the actual curb weight to the total number of sample models is the same as the ratio of the number of models with a calculated curb weight lower than the actual curb weight to the total number of sample models, thereby obtaining the adjusted relationship formula between footprint area and curb weight (3);

[0016] Obtain a target fuel consumption value calculation formula based on curb mass, and obtain a target fuel consumption value calculation formula based on footprint area through the relationship formula (3) between footprint area and curb mass and the target fuel consumption value calculation formula based on curb mass.

[0017] In some embodiments of the present application, the steps are performed by adjusting formula (2) so that the ratio of the number of models whose calculated curb weight is higher than the actual curb weight to the total number of sample models is the same as the ratio of the number of models whose calculated curb weight is lower than the actual curb weight to the total number of sample models, including:

[0018] The constant term b1 in formula (2) is adjusted until the ratio of the number of models with a calculated curb weight higher than the actual curb weight to the total number of sample models is the same as the ratio of the number of models with a calculated curb weight lower than the actual curb weight to the total number of sample models. The relationship formula (3) between the footprint area and the curb weight after the first adjustment is obtained as follows:

[0019] CM=K1×FP-b2 (3)

[0020] Where b2 is the constant term of the linear function after the first adjustment.

[0021] In some embodiments of the present application, the step of obtaining a fuel consumption target value calculation formula based on curb weight, and obtaining a fuel consumption target value calculation formula based on footprint area by using the relationship formula (3) between footprint area and curb weight and the fuel consumption target value calculation formula based on curb weight, includes:

[0022] The calculation formula (4) for obtaining the fuel consumption target value based on the curb weight is:

[0023]

[0024] Where, T is the target fuel consumption value of the vehicle model, in liters per 100 kilometers (L / 100km); CM0 is the base curb weight, in kilograms (kg), specifically 1415kg;

[0025] The relationship between the footprint area and the curb weight is obtained by the relationship formula (3) of the reference footprint area corresponding to the reference curb weight:

[0026] CM0=K1×FP0-b2

[0027] Where FP0 is the base footprint area corresponding to the base curb mass CM0, in square meters (m 2 );

[0028] Substituting the curb weight at the lower inflection point and the upper inflection point in the curb weight-based fuel consumption target value calculation formula (4) into the relationship formula (3) between the footprint area and the curb weight, the corresponding footprint area FP1 at the lower inflection point and the footprint area FP2 at the upper inflection point are obtained respectively:

[0029]

[0030] The fuel consumption target value calculation formula (5) based on the footprint area is obtained by the footprint area FP1 at the lower inflection point, the footprint area FP2 at the upper inflection point, the reference footprint area FP0, the relationship formula (3) between the footprint area and the curb weight, and the fuel consumption target value calculation formula (4) based on the curb weight:

[0031]

[0032] Where K2 is the slope of the converted linear function.

[0033] In some embodiments of the present application, the step of obtaining a fuel consumption target value calculation formula based on curb weight, obtaining a fuel consumption target value calculation formula based on footprint area through the relationship formula (3) between footprint area and curb weight and the fuel consumption target value calculation formula based on curb weight, further includes:

[0034] The actual curb weight of the sample vehicle model is used to calculate the fuel consumption target value based on the curb weight of each model in the sample vehicle, and industry weighting is performed to obtain the weighted fuel consumption target value based on the curb weight;

[0035] The footprint area is used to calculate the target fuel consumption value based on the footprint area for each model of the sample vehicle, and the industry weighting is performed to obtain the weighted target fuel consumption value based on the footprint area;

[0036] calculating a deviation between the weighted curb mass-based fuel consumption target value and the weighted footprint-based fuel consumption target value;

[0037] According to the deviation figure, the formula for calculating the fuel consumption target value based on the footprint area is adjusted.

[0038] In some embodiments of the present application, the step of adjusting the calculation formula of the fuel consumption target value based on the footprint area according to the deviation number includes:

[0039] If the deviation figure is less than 1%, the fuel consumption target value calculation formula (5) based on the footprint area is determined as the final fuel consumption target value calculation formula based on the footprint area;

[0040] If the deviation is greater than 1%, K1 and b2 in the relationship formula (3) between the footprint area and the curb weight are adjusted for the second time to make the deviation less than 1%, and the calculation formula (6) for the target value of fuel consumption based on the footprint area after the deviation adjustment is obtained:

[0041]

[0042] Wherein, FP1′ is the footprint area at the lower inflection point after the second adjustment of the relationship formula (3) between the footprint area and the curb weight, FP2′ is the footprint area at the upper inflection point after the second adjustment of the relationship formula (3) between the footprint area and the curb weight, K3 is the function slope obtained by substituting the relationship formula (3) between the footprint area and the curb weight into formula (4) after the second adjustment, and FP0′ is the reference footprint area corresponding to the reference curb weight of 1415 kg after the second adjustment of the relationship formula (3) between the footprint area and the curb weight.

[0043] In some embodiments of the present application, the calculation formula of the industry weight is as follows:

[0044]

[0045] Where: T CAFCis the industry weighted average fuel consumption target value, in liters per 100 kilometers (L / 100km); i is the passenger car model number; n is the total number of passenger car models; T i is the target fuel consumption value corresponding to the i-th vehicle model, in liters per 100 kilometers (L / 100km), calculated by equations (1) to (6), L / 100km; V i is the annual production or import volume of the i-th model, units.

[0046] In some embodiments of the present application, the vehicle data further includes: one or more of the vehicle's front wheel track, the vehicle's rear wheel track, the vehicle's wheelbase, and the actual announced fuel consumption.

[0047] In some embodiments of the present application, the footprint area of ​​the vehicle model is calculated by a formula, and the calculation formula (1) is:

[0048] FP=(L1+L2)×L3÷2 (1)

[0049] Where FP is the footprint area in square meters (m 2 ); L1 is the front wheel track of the vehicle, in meters (m); L2 is the rear wheel track of the vehicle, in meters (m); L3 is the wheelbase of the vehicle, in meters (m).

[0050] In some embodiments of the present application, the relationship formula between footprint area and curb weight obtained by linear regression analysis method includes:

[0051] A scatter plot of the actual curb weight and footprint area of ​​each vehicle model was drawn in a rectangular coordinate system, and a preliminary formula (2) for the relationship between footprint area and curb weight was obtained through computer fitting analysis.

[0052] One or more of the above embodiments of the present application have at least the following beneficial effects:

[0053] This application proposes a method for calculating the target value of fuel consumption of passenger vehicles, which aims to replace the traditional calculation method based on curb weight. This method determines the target value of fuel consumption by the footprint area of ​​the passenger vehicle, which can effectively encourage the development of "large and light" type vehicles, actively guide the development of "large and heavy" type vehicles in the direction of "large and light", and effectively inhibit the development of "small and heavy" type vehicles, thus promoting the improvement of fuel efficiency and the reduction of emissions, and has a positive impact on environmental protection.

[0054] This approach maintains the stability of the industry's overall fuel consumption target by ensuring a balance between the number of models whose fuel consumption targets are relaxed and the number of models whose fuel consumption targets are tightened, while also encouraging technological progress and fair competition.

[0055] In addition, this approach improves the scientificity and rationality of policy making, helping the automotive industry to adapt to international standards and enhance global competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0057] Figure 1 is a flow chart of a method for calculating a target value of fuel consumption of a passenger vehicle provided in an embodiment of the present application;

[0058] Figure 2 is a scatter plot of the relationship between the footprint area and the curb weight before the first adjustment provided in an embodiment of the present application;

[0059] Figure 3 is a scatter plot of the relationship between the footprint area and the curb weight after the first adjustment provided in an embodiment of the present application;

[0060] Figure 4 is a functional relationship diagram of fuel target and curb weight provided according to an embodiment of the present application;

[0061] Figure 5 is a functional relationship diagram of fuel target and footprint area according to an embodiment of the present application;

[0062] Figure 6 It is a distribution diagram of sample vehicle categories provided according to an embodiment of the present application;

[0063] Figure 7 It is a fuel target value variation diagram for a sample vehicle category provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0064] Embodiments of the present application will be described in detail below, examples of which are shown in the accompanying drawings, and the components of the embodiments of the present application generally described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application claimed for protection, but merely represents selected embodiments of the present application.

[0065] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0066] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0067] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] The following will be combined Figure 1 and Figure 7 The technical solution of the present application is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0069] See also Figure 1 The present application provides a method for calculating a target value of fuel consumption of a passenger vehicle, comprising:

[0070] Step S100, obtaining sample vehicle data;

[0071] The sample vehicles can use the total production or import data of all passenger vehicles collected in a certain year. The vehicle data includes the vehicle footprint area and the vehicle curb mass. The vehicle footprint area is the area determined by the vehicle's wheelbase and wheelbase, which is used to calculate the fuel consumption target instead of the curb mass; the wheelbase is the distance between the two wheels of the vehicle, and the wheelbase is the distance between the front and rear axles of the vehicle; the vehicle curb mass includes the weight of standard equipment, all necessary operating fluids (such as engine oil, coolant, fuel, etc.) and a full-size spare tire.

[0072] Having enough sample vehicle data can help ensure the universality and applicability of the research results, improve the accuracy of the footprint-based fuel consumption target calculation method, and ensure fairness between different manufacturers and different types of vehicles.

[0073] In some embodiments of the present application, the total production or import data of all passenger vehicles in 2021 is used as sample vehicle data; in some specific examples, the total production or import data of non-new energy passenger vehicles with less than three rows of seats in 2021 is used as sample vehicle data.

[0074] Step S100, obtaining sample vehicle data specifically includes:

[0075] Step S110, obtaining the vehicle model and corresponding quantity, as well as the actual curb weight, front wheel track, rear wheel track, wheelbase, and actual announced fuel consumption data of each vehicle model;

[0076] Sample vehicle data can be obtained through a variety of means such as website query, vehicle parameter manual, and field measurement.

[0077] Step S120: Calculate the footprint area of ​​each vehicle model in the sample using the following calculation formula (1):

[0078] FP=(L1+L2)×L3÷2 (1)

[0079] Where FP is the footprint of the vehicle in square meters (m 2 ); L1 is the front wheel track of the vehicle, in meters (m); L2 is the rear wheel track of the vehicle, in meters (m); L3 is the wheelbase of the vehicle, in meters (m).

[0080] Step S200, obtaining a relationship formula between footprint area and curb weight by linear regression analysis method; specifically including:

[0081] Step S210: Draw a scatter plot of the actual curb weight and footprint area of ​​each vehicle model in a rectangular coordinate system, and preliminarily obtain the relationship formula (2) between the footprint area and the curb weight through computer fitting analysis:

[0082] CM=K1×FP-b1 (2)

[0083] Where CM is the vehicle's curb mass in kilograms (kg); K1 is the slope of the linear function, b1 is the constant term of the linear function, and FP is the vehicle's footprint in square meters (m2). 2 );

[0084] In some embodiments of the present application, Figure 2 As shown in FIG. 1 , when the footprint area and the actual curb weight of the sample vehicle are known, the relationship between the footprint area and the curb weight is fitted by computer (2):

[0085] CM = 613.59 × FP - 1159.4

[0086] Step S220, adjusting the relationship formula (2) between the footprint area and the curb weight fitted by the computer to obtain an adjusted relationship formula between the footprint area and the curb weight, specifically comprising:

[0087] Step S221, substituting the footprint area into formula (2) to obtain the calculated curb weight of each model of the sample vehicle;

[0088] Step S222, conduct rationality assessment: when the calculated curb weight is higher than the actual curb weight, it can be determined that the fuel consumption target value is relaxed; when the calculated curb weight is lower than the actual curb weight, it can be determined that the fuel consumption target value is tightened; calculate the ratio of the number of vehicle models with relaxed fuel consumption target values ​​to the total number of vehicle models in the sample and the ratio of the number of vehicle models with tightened fuel consumption target values ​​to the total number of vehicle models in the sample;

[0089] In some embodiments of the present application, Figure 2 As shown, through calculation, it can be obtained that the vehicle models with curb weight lower than the actual curb weight, that is, the vehicle models with stricter fuel consumption target values ​​account for 43.1% of the total number of sample models, and the vehicle models with relaxed fuel consumption target values ​​account for 56.9%, which will lead to the relaxation of industry fuel consumption target values, which will increase automobile fuel consumption and emissions, which is contrary to the increasingly stringent environmental regulations and the goal of reducing greenhouse gas emissions; at the same time, if the fuel consumption target values ​​of more vehicles are relaxed, automobile manufacturers may reduce investment and innovation in improving fuel efficiency and lightweight design, thereby affecting technological progress.

[0090] Step S223, determine whether the ratio of the number of vehicle models with relaxed fuel consumption target values ​​to the total number of sample vehicle models is the same as the ratio of the number of vehicle models with tightened fuel consumption target values ​​to the total number of sample vehicle models. If not, adjust the constant term b1 in formula (2), and return to step S221 and proceed downward; if yes, proceed downward;

[0091] Step S224, the relationship formula (3) between the footprint area and the curb weight is obtained as follows:

[0092] CM=K1×FP-b2 (3)

[0093] In the formula, b2 is a constant term of the linear function. If it is determined in step S223 that the proportion of vehicles whose fuel consumption target values ​​are relaxed is the same as the proportion of vehicles whose fuel consumption target values ​​are tightened, then b2=b1.

[0094] In some embodiments of the present application, Figure 3As shown, the preliminary relationship formula (2) between footprint area and curb weight is adjusted for the first time. By adjusting the value of the constant term, the number of models with relaxed and tightened fuel consumption targets accounts for the same proportion of the total number of sample models. The adjusted relationship formula (3) between footprint area and curb weight is specifically:

[0095] CM = 613.59 × FP - 1176.4

[0096] Different vehicles may have different fuel consumption performances due to differences in design, purpose and target market. By ensuring that the number of vehicles subject to relaxed and tightened requirements is roughly equal, significant changes in the overall fuel consumption target for the passenger car industry can be avoided, thereby achieving the effect of encouraging technological progress in automobiles while maintaining the stability and continuity of the industry.

[0097] Step S300, obtaining a fuel consumption target value calculation formula based on curb mass, and obtaining a fuel consumption target value calculation formula based on footprint area by using the relationship formula (3) between footprint area and curb mass and the fuel consumption target value calculation formula based on curb mass, which specifically includes:

[0098] Step S310, obtaining a calculation formula (4) for a target fuel consumption value based on curb weight, substituting the curb weight at the inflection point and the reference curb weight into the relationship formula (3) between the footprint area and the curb weight, and obtaining the footprint area at the inflection point and the reference footprint area;

[0099] In some embodiments of the present application, see Figure 4 According to GB2799-2019, the target value calculation formula for fuel consumption based on curb weight (4) is:

[0100]

[0101] Where T is the target fuel consumption value of the vehicle model, in liters per 100 kilometers (L / 100km); CM0 is the base curb weight, in kilograms (kg), specifically 1415kg, that is, when the curb weight of the vehicle is 1415kg, the target fuel consumption value is exactly 4.6L / 100km as specified in the new standard;

[0102] The relationship between the footprint area and the curb weight is obtained by the relationship formula (3) of the reference footprint area corresponding to the reference curb weight:

[0103] CM0=K1×FP0-b2

[0104] Where FP0 is the base footprint area corresponding to the base curb mass CM0 of the sample vehicle, in square meters (m 2 );

[0105] Substituting the curb weight at the lower inflection point, i.e., 1090 kg, and the curb weight at the upper inflection point, i.e., 2510 kg, in the curb weight-based fuel consumption target value calculation formula (4) into the footprint area and curb weight relationship formula (3), the corresponding footprint area FP1 at the lower inflection point and the footprint area FP2 at the upper inflection point are obtained as follows:

[0106]

[0107] In some embodiments of the present application, the footprint area corresponding to the curb weight of 1090 kg at the lower inflection point and the curb weight of 2510 kg at the upper inflection point is calculated to be 3.7 m respectively through the relationship formula (3) between the footprint area and the curb weight after the first adjustment and the calculation formula (4) of the target value of fuel consumption based on the curb weight. 2 and 6m 2 The base curb weight is 1415kg and the base footprint is 4.22m 2 .

[0108] Step S320: Substitute the relationship formula (3) between footprint area and curb weight, the relationship formula of the reference footprint area corresponding to the reference curb weight, and the footprint area at the inflection point into the target fuel consumption value calculation formula (4) based on the curb weight, and obtain the target fuel consumption value calculation formula (5) based on the footprint area:

[0109]

[0110] Where K2 is the slope of the converted linear function.

[0111] In some embodiments of the present application, Figure 5 As shown, the lower inflection point, upper inflection point and base footprint area are 3.7m 2 、6m 2 and 4.22m 2 , and the relationship between the footprint area and the curb weight after the first adjustment (3) are substituted into the calculation formula (5) to obtain the target value of fuel consumption based on the footprint area:

[0112]

[0113] Step S330, using the actual curb weight of the sample vehicle model to calculate the fuel consumption target value based on the curb weight of each model in the sample vehicle, and performing industry weighting to obtain the weighted fuel consumption target value based on the curb weight;

[0114] Calculate the target fuel consumption value based on the footprint area for each model of the sample vehicle using the footprint area, and perform industry weighting to obtain the weighted target fuel consumption value based on the footprint area;

[0115] calculating a deviation between the weighted curb mass-based fuel consumption target value and the weighted footprint-based fuel consumption target value;

[0116] Step S340, determine whether the deviation is less than 1%. If not, fine-tune K1 and b2 in the relationship formula (2) between the footprint area and the curb weight, and return to step S310 to proceed downward; if yes, proceed downward;

[0117] Step S350, determining the final fuel consumption target value calculation formula (6) based on the footprint area;

[0118] If the judgment in step S340 is yes, the calculation formula (5) is used as the final fuel consumption target value calculation formula (6) based on the footprint area;

[0119] If the answer in step S340 is no, the final calculation formula (6) of the target value of fuel consumption based on the footprint area is:

[0120]

[0121] Wherein, FP1′ is the footprint area at the lower inflection point after the second adjustment of the relationship formula (3) between the footprint area and the curb weight, FP2′ is the footprint area at the upper inflection point after the second adjustment of the relationship formula (3) between the footprint area and the curb weight, K3 is the function slope obtained by substituting the relationship formula (3) between the footprint area and the curb weight into formula (4) after the second adjustment, and FP0′ is the reference footprint area corresponding to the reference curb weight of 1415 kg after the second adjustment of the relationship formula (3) between the footprint area and the curb weight.

[0122] Industry weighting is a method of calculating an average or other statistic based on the importance or weight of each part when evaluating an overall indicator within an entire industry or field.

[0123] The weighted calculation formula is as follows:

[0124]

[0125] Where: T CAFC is the enterprise average fuel consumption target value, in liters per 100 kilometers (L / 100km); i is the passenger car model number; n is the total number of passenger car models; T iis the target fuel consumption value corresponding to the i-th vehicle model, in liters per 100 kilometers (L / 100km), calculated by equations (1) to (6), L / 100km; V i is the annual production or import volume of the i-th model, units.

[0126] In some embodiments of the present application, the entire industry is regarded as a company for measurement, and the fuel consumption target values ​​based on the curb weight and the footprint area of ​​each model in the sample vehicle are calculated respectively, and then the weighted average fuel consumption target values ​​of the industry of the two methods are calculated by the weighted calculation formula; the weighted average fuel consumption target value of the industry calculated based on the actual curb weight is: 4.701L / 100km; the weighted average fuel consumption target value of the industry calculated based on the footprint area is: 4.698L / 100km, with a deviation of 0.5%, which is less than 1%. By controlling the deviation within 1%, after switching to the method of calculating the fuel consumption target value based on the footprint area, it will not have a significant impact on the entire automotive industry.

[0127] The final calculation formula (6) for the target value of fuel consumption based on the footprint area is determined as follows:

[0128]

[0129] In some embodiments of the present application, see Figure 6 The passenger car category of the sample vehicles can be defined and classified according to the parameters: the curb weight is greater than 1415kg as "heavy", less than 1415kg as "light"; the footprint area is greater than 4.22m 2 "Large", less than 4.22m 2 The word "small" can be combined to classify vehicles into categories such as "small and heavy", "large and heavy", "large and light", and "small and light".

[0130] In some embodiments of the present application, see Figure 6 , Figure 7 According to the method of calculating the fuel consumption target value based on the footprint area, the sample vehicles are calculated, and it can be obtained that: "small and heavy" vehicles account for 19.2%, and the fuel consumption target value is tightened by 0.26; "large and heavy" vehicles account for 25%, and the fuel consumption target value is tightened by 0.09; "large and light" vehicles account for 1.3%, and the fuel consumption target value is relaxed by 0.21; "small and light" vehicles account for 54.5%, and the fuel consumption target value is relaxed by 0.06. That is, the method for calculating the fuel consumption target value based on the footprint area provided in this application can effectively inhibit the development of "small and heavy" vehicles, and can also effectively encourage the development of "large and light" vehicles, and can also actively guide "large and heavy" vehicles to develop in the direction of "large and light".

[0131] It should be noted that the technical solutions in the various embodiments of the present application can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in the field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist, that is, it does not belong to the scope of protection of this application.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for calculating a target value of fuel consumption of a passenger car, characterized in that: The method comprises: Obtaining sample vehicle data, the vehicle data including vehicle model, number of vehicle models, vehicle model footprint, and actual curb weight; The relationship between footprint area and curb weight is obtained by linear regression analysis (2): CM=K 11 ×FP-b1 (2) Where CM is the vehicle curb mass in kilograms (kg); K1 is the slope of the linear function, b1 is the constant term of the linear function, and FP is the footprint area of ​​the vehicle in square meters (m2). 2 ); Substitute the footprint area of ​​the vehicle model into formula (2) to obtain the calculated curb weight of each model in the sample vehicle. By adjusting formula (2), the ratio of the number of models with a calculated curb weight higher than the actual curb weight to the total number of sample models is the same as the ratio of the number of models with a calculated curb weight lower than the actual curb weight to the total number of sample models, thereby obtaining the adjusted relationship formula between footprint area and curb weight (3); Obtain a target fuel consumption value calculation formula based on curb mass, and obtain a target fuel consumption value calculation formula based on footprint area through the relationship formula (3) between footprint area and curb mass and the target fuel consumption value calculation formula based on curb mass.

2. The method according to claim 1, characterized in that The step adjusts formula (2) so that the ratio of the number of models whose calculated curb weight is higher than the actual curb weight to the total number of sample models is the same as the ratio of the number of models whose calculated curb weight is lower than the actual curb weight to the total number of sample models, including: The constant term b1 in formula (2) is adjusted until the ratio of the number of models with a calculated curb weight higher than the actual curb weight to the total number of sample models is the same as the ratio of the number of models with a calculated curb weight lower than the actual curb weight to the total number of sample models. The relationship formula (3) between the footprint area and the curb weight after the first adjustment is obtained as follows: CM=K1×FP-b2 (3) Where b2 is the constant term of the linear function after the first adjustment.

3. The method according to claim 2, characterized in that The step obtains a fuel consumption target value calculation formula based on curb weight, and obtains a fuel consumption target value calculation formula based on footprint area by using the relationship formula (3) between footprint area and curb weight and the fuel consumption target value calculation formula based on curb weight, including: The calculation formula (4) for obtaining the fuel consumption target value based on the curb weight is: Where, T is the target fuel consumption value of the vehicle model, in liters per 100 kilometers (L / 100km); CM0 is the base curb weight, in kilograms (kg), specifically 1415kg; The relationship between the footprint area and the curb weight is obtained by the relationship formula (3) of the reference footprint area corresponding to the reference curb weight: CM0=K1×FP0-b2 Where FP0 is the base footprint area corresponding to the base curb mass CM0, in square meters (m 2 ); Substituting the curb weight at the lower inflection point and the upper inflection point in the curb weight-based fuel consumption target value calculation formula (4) into the relationship formula (3) between the footprint area and the curb weight, the corresponding footprint area FP1 at the lower inflection point and the footprint area FP2 at the upper inflection point are obtained respectively: The fuel consumption target value calculation formula (5) based on the footprint area is obtained by the footprint area FP1 at the lower inflection point, the footprint area FP2 at the upper inflection point, the reference footprint area FP0, the relationship formula (3) between the footprint area and the curb weight, and the fuel consumption target value calculation formula (4) based on the curb weight: Where K2 is the slope of the converted linear function.

4. The method according to claim 3, characterized in that The step obtains a fuel consumption target value calculation formula based on curb weight, obtains a fuel consumption target value calculation formula based on footprint area through the relationship formula (3) between footprint area and curb weight and the fuel consumption target value calculation formula based on curb weight, and further includes: The actual curb weight of the sample vehicle model is used to calculate the fuel consumption target value based on the curb weight of each model in the sample vehicle, and industry weighting is performed to obtain the weighted fuel consumption target value based on the curb weight; The footprint area is used to calculate the target fuel consumption value based on the footprint area for each model of the sample vehicle, and the industry weighting is performed to obtain the weighted target fuel consumption value based on the footprint area; calculating a deviation between the weighted curb mass-based fuel consumption target value and the weighted footprint-based fuel consumption target value; According to the deviation figure, the formula for calculating the fuel consumption target value based on the footprint area is adjusted.

5. The method according to claim 4, characterized in that The step of adjusting the calculation formula of the fuel consumption target value based on the footprint area according to the deviation number includes: If the deviation figure is less than 1%, the fuel consumption target value calculation formula (5) based on the footprint area is determined as the final fuel consumption target value calculation formula based on the footprint area; If the deviation is greater than 1%, K1 and b2 in the relationship formula (3) between the footprint area and the curb weight are adjusted for the second time to make the deviation less than 1%, and the calculation formula (6) for the target value of fuel consumption based on the footprint area after the deviation adjustment is obtained: Wherein, FP1′ is the footprint area at the lower inflection point after the second adjustment of the relationship formula (3) between the footprint area and the curb weight, FP2′ is the footprint area at the upper inflection point after the second adjustment of the relationship formula (3) between the footprint area and the curb weight, K3 is the function slope obtained by substituting the relationship formula (3) between the footprint area and the curb weight into formula (4) after the second adjustment, and FP0′ is the reference footprint area corresponding to the reference curb weight of 1415 kg after the second adjustment of the relationship formula (3) between the footprint area and the curb weight.

6. The method according to claim 4, characterized in that The industry weighting is calculated as follows: Where: T CAFC is the industry weighted average fuel consumption target value, in liters per 100 kilometers (L / 100km); i is the passenger car model number; n is the total number of passenger car models; T i is the target fuel consumption value corresponding to the i-th vehicle model, in liters per 100 kilometers (L / 100km), calculated by equations (1) to (6), L / 100km; V i is the annual production or import volume of the i-th model, units.

7. The method according to claim 1, characterized in that The vehicle data further includes: one or more of the vehicle front wheel track, the vehicle rear wheel track, the vehicle wheelbase, and the actual announced fuel consumption.

8. The method according to claim 7, characterized in that The footprint area of ​​the vehicle model is calculated by the formula, and the calculation formula (1) is: FP=(L1+L2)×L3÷2 (1) Where FP is the footprint area in square meters (m 2 ); L1 is the front wheel track of the vehicle, in meters (m); L2 is the rear wheel track of the vehicle, in meters (m); L3 is the wheelbase of the vehicle, in meters (m).

9. The method according to claim 1, characterized in that: The relationship formula between the footprint area and the curb weight obtained by the linear regression analysis method includes: A scatter plot of the actual curb weight and footprint area of ​​each vehicle model was drawn in a rectangular coordinate system, and a preliminary formula (2) for the relationship between footprint area and curb weight was obtained through computer fitting analysis.

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