Method and device for evaluating energy saving effect

Abstract

The application discloses an energy-saving effect evaluation method and device, and the evaluation method obtains the ambient temperature where a target vehicle is located, carries out wind resistance energy-saving evaluation on the target vehicle according to the ambient temperature, obtains the unloaded sliding resistance and the loaded sliding resistance of the target vehicle, carries out fuel energy-saving evaluation on the target vehicle under the evaluation working condition, obtains the working condition mileage of the evaluation working condition, and the unloaded energy consumption efficiency and the loaded energy consumption efficiency, and determines the energy-saving effect of the active air intake grille on the target vehicle according to the unloaded sliding resistance, the loaded sliding resistance, the working condition mileage, the unloaded energy consumption efficiency and the loaded energy consumption efficiency. Since the energy-saving effect of the active air intake grille is calculated, the evaluation indexes are reasonably decomposed, the calculation is carried out based on the states of installing the active air intake grille and not installing the active air intake grille, the technical line of the whole evaluation process is more scientific and perfect, the accurate quantitative evaluation of energy-saving is realized, and the accuracy of the energy-saving effect evaluation of the active air intake grille is improved.

Description

Technical Field

[0001] This invention relates to the technical field of energy-saving effect evaluation, and in particular to a method and apparatus for evaluating energy-saving effect. Background Technology

[0002] With the rapid development of the automotive industry, national and market requirements for energy consumption (fuel and electricity consumption) are becoming increasingly stringent. Energy consumption improvement encompasses both energy demand factors and energy conversion factors. Energy conversion factors include power systems such as engines, generators, and drive motors. With continuous technological advancements, the efficiency of power systems has approached its limits in recent years. Therefore, reducing energy demand has become the most important means for companies to reduce energy consumption. Furthermore, with increasing electrification, the impact of energy demand on energy consumption is gradually increasing. Energy demand includes factors such as wind resistance, rolling resistance, drag torque, and low-pressure accessories. Among the current evaluation conditions and scenarios, wind resistance has the highest energy proportion and sensitivity among energy demand factors; therefore, improving wind resistance has become a crucial means of improving energy consumption.

[0003] The main air intake grille is an adjustable air intake grille located on the front of a car, typically installed behind the center grille and in front of the engine compartment. Its primary functions are air intake and cooling of the engine. Currently, there is a lack of accurate implementation plans for assessing the energy-saving effects of active air intake grilles, which directly impacts both the risk controllability of vehicle performance development and the lean cost control of vehicle models.

[0004] Therefore, improving the accuracy of the evaluation of the energy-saving effect of the main air intake grille is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The present invention provides a method and apparatus for evaluating energy-saving effects, which improves the accuracy of evaluating the energy-saving effects of the main air intake grille.

[0006] The embodiments of the present invention provide the following solutions:

[0007] In a first aspect, embodiments of the present invention provide a method for evaluating energy-saving effects, the method comprising:

[0008] The ambient temperature of the target vehicle is obtained, wherein the target vehicle is a vehicle equipped with an active grille shutter;

[0009] Based on the ambient temperature, the wind resistance and energy saving of the target vehicle are evaluated to obtain the unloading sliding resistance of the target vehicle without the active air intake grille and the loading sliding resistance with the active air intake grille installed.

[0010] The target vehicle is evaluated for fuel efficiency under preset evaluation conditions to obtain the mileage under the evaluation conditions, as well as the unloading energy efficiency of the target vehicle without the active grille and the loading energy efficiency with the active grille installed.

[0011] The energy savings of the active air intake grille for the target vehicle are determined based on the unloading coasting resistance, the loading coasting resistance, the operating mileage, the unloading energy efficiency, and the loading energy efficiency.

[0012] In one optional embodiment, the step of evaluating the wind resistance and energy efficiency of the target vehicle based on the ambient temperature to obtain the loading skid resistance of the target vehicle with the active air intake grille installed includes:

[0013] When the ambient temperature is normal, the vehicle resistance relationship of the target vehicle without the active air intake grille is obtained, as well as the first gliding resistance and the second gliding resistance when the gliding speed is greater than the speed threshold. The vehicle resistance relationship at normal temperature is the correspondence between the gliding resistance and the vehicle speed of the target vehicle without the active air intake grille at normal temperature.

[0014] Based on the first gliding resistance and the second gliding resistance, a first drag coefficient is obtained for the target vehicle without the active air intake grille installed.

[0015] The first drag coefficient is converted into a second drag coefficient for the target vehicle when the active air intake grille is installed.

[0016] Based on the first drag coefficient, the second drag coefficient, and the normal temperature vehicle resistance relationship, the loading and sliding resistance of the target vehicle when the active air intake grille is installed at different evaluated vehicle speeds is obtained.

[0017] In an optional embodiment, when the ambient temperature is lower than the normal temperature environment, after obtaining the loading and sliding resistance of the target vehicle at different evaluated vehicle speeds by installing the active air intake grille based on the first drag coefficient, the second drag coefficient, and the normal temperature vehicle resistance relationship, the method further includes:

[0018] The loading and sliding resistance is updated according to a preset coefficient, and the updated loading and sliding resistance is determined as the sliding resistance of the target vehicle when the active air intake grille is loaded in an environment below the normal temperature.

[0019] In one optional embodiment, fuel efficiency is evaluated on the target vehicle under preset evaluation conditions to obtain the unloading energy efficiency and the loading energy efficiency, including:

[0020] The target vehicle is subjected to a wheel rotation test based on the evaluation conditions to obtain the average vehicle speed, the average unloading resistance without the active air intake grille, and the average loading resistance with the active air intake grille installed.

[0021] Based on the average vehicle speed and the average unloading resistance, the target vehicle is controlled to run at a constant speed to obtain the first operating data;

[0022] The target vehicle is controlled to run at a constant speed based on the average vehicle speed and the average load resistance to obtain second operating data.

[0023] The unloading energy efficiency is obtained based on the first operating data, and the loading energy efficiency is obtained based on the second operating data.

[0024] In one optional embodiment, obtaining the unloading energy efficiency based on the first operating data and obtaining the loading energy efficiency based on the second operating data includes:

[0025] The unloading fuel injection amount for the target vehicle without the active grille is determined in the first operating data based on the unloading average water temperature, wherein the unloading average water temperature is the average water temperature of the target vehicle when the active grille is not installed, as the water temperature rises from the initial water temperature to the stable water temperature.

[0026] According to the formula The unloading energy efficiency η1 is obtained, where F1 is the average unloading resistance, d1 is the unloading running mileage in the first running data, and f1 is the unloading fuel injection quantity.

[0027] The loading fuel injection amount for installing the active grille on the target vehicle is determined in the second operating data based on the average loading water temperature, wherein the average loading water temperature is the average water temperature of the target vehicle as it rises from the initial water temperature to the stable water temperature when the active grille is installed;

[0028] According to the formula The loading energy efficiency η2 is obtained, where F2 is the average loading resistance, d2 is the loading mileage in the second operating data, f2 is the loading fuel injection quantity, ρ is the fuel density, and q is the fuel calorific value.

[0029] In an optional embodiment, when the ambient temperature is lower than the normal temperature environment, before determining the unloading fuel injection quantity for the target vehicle without the active grille based on the unloading average water temperature in the first operating data, the method further includes:

[0030] The target vehicle without the active air intake grille is started and operated under the evaluation conditions to obtain the first heating time, stable temperature, operating time and unloading average water temperature of the target vehicle as it rises from the initial water temperature to the stable water temperature.

[0031] The active air intake grille was simulated and tested to obtain a time optimization ratio, wherein the time optimization ratio is the ratio of the warm-up time of the target vehicle with the active air intake grille installed to the warm-up time without the active air intake grille installed.

[0032] According to the formula t2=t1×(1-α), the second heating time t2 of the target vehicle is obtained when the active air intake grille is installed, where t1 is the first heating time and α is the time optimization ratio;

[0033] The average loading water temperature T2 is obtained according to the formula T2=(T1×t2+T0×(t0-t2)) / t0, where T1 is the average unloading water temperature, t2 is the second heating time, T0 is the stable temperature, and t0 is the operating time under the working condition.

[0034] In one optional embodiment, determining the energy savings of the active grille shutter for the target vehicle based on the unloading coasting resistance, the loading coasting resistance, the operating mileage, the unloading energy efficiency, and the loading energy efficiency includes:

[0035] According to the formula E1=F3×D / η1, the first energy consumption E1 without the active air intake grille is obtained, where F3 is the unloading sliding resistance and η1 is the unloading energy consumption efficiency.

[0036] According to the formula E2=F4×D / η2, the second energy consumption E2 of installing the active air intake grille is obtained, where F4 is the loading energy consumption efficiency and η2 is the loading energy consumption efficiency;

[0037] The energy saving is obtained based on the difference between the first energy consumption and the second energy consumption.

[0038] Secondly, embodiments of the present invention also provide an energy-saving effect evaluation device, the device comprising:

[0039] The acquisition module is used to acquire the ambient temperature of the target vehicle, wherein the target vehicle is a vehicle equipped with an active grille shutter;

[0040] The first obtaining module is used to evaluate the wind resistance and energy saving of the target vehicle based on the ambient temperature, and to obtain the unloading sliding resistance of the target vehicle without the active air intake grille and the loading sliding resistance with the active air intake grille installed.

[0041] The second acquisition module is used to evaluate the fuel efficiency of the target vehicle under preset evaluation conditions, and to obtain the mileage of the evaluation conditions, as well as the unloading energy consumption efficiency of the target vehicle without the active air intake grille and the loading energy consumption efficiency with the active air intake grille installed.

[0042] The determination module is used to determine the energy saving of the target vehicle by the active air intake grille based on the unloading coasting resistance, the loading coasting resistance, the operating mileage, the unloading energy consumption efficiency, and the loading energy consumption efficiency.

[0043] Thirdly, embodiments of the present invention also provide an electronic device, including a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of any of the methods described in the first aspect.

[0044] Fourthly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any one of the first aspects.

[0045] The energy-saving effect evaluation method and apparatus of the present invention have the following advantages compared with the prior art:

[0046] This invention obtains the ambient temperature of a target vehicle equipped with an active grille, evaluates its wind resistance and energy efficiency based on this temperature, and obtains the unloading coasting resistance without and loading coasting resistance with the active grille installed. Under preset evaluation conditions, it evaluates the vehicle's fuel economy, obtaining the mileage under these conditions, as well as the unloading energy efficiency and loading energy efficiency. Based on the unloading coasting resistance, loading coasting resistance, mileage, unloading energy efficiency, and loading energy efficiency, the energy savings of the active grille for the target vehicle are determined. Because the evaluation indicators are rationally decomposed when calculating the energy-saving effect of the active grille, and calculations are performed separately for the states with and without the active grille, the entire evaluation process is more scientific and complete, enabling accurate quantitative assessment of energy savings and thus improving the accuracy of the main grille's energy-saving effect evaluation. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A flowchart of the energy-saving effect evaluation method provided in the embodiments of the present invention;

[0049] Figure 2 A diagram illustrating the implementation steps of the energy-saving effect evaluation method provided in this embodiment of the invention;

[0050] Figure 3 This is a schematic diagram of the energy-saving effect evaluation device provided in an embodiment of the present invention. Detailed Implementation

[0051] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the protection scope of the embodiments of the present invention.

[0052] Currently, the energy-saving effect evaluation of Active Grille System (AGS) is mostly conducted through on-road driving verification or virtual vehicle verification. On-road verification is mainly used to evaluate the energy-saving effect of energy-saving technologies after their implementation, with the main purpose of acceptance testing of energy-saving technologies / devices in the actual vehicle stage. It is characterized by its long processing time and high cost. Virtual verification is mainly used for the early stage of vehicle project energy-saving technology energy-saving effect prediction, with the main purpose of FQCD full value chain analysis of energy-saving technologies / devices. It is characterized by low accuracy and low cost. Therefore, accurately assessing the overall vehicle energy-saving effect of effective drag-improving measures such as Active Grille System on a specific vehicle model before the implementation of energy-saving technologies, and effectively obtaining its full energy-saving value chain data, directly affects the risk controllability of vehicle performance development and the lean cost control of the vehicle model. The following embodiments of the present invention will specifically illustrate how to accurately determine the energy savings of a target vehicle equipped with Active Grille System.

[0053] Please see Figure 1 , Figure 1 This is a flowchart of a method for evaluating energy-saving effects according to an embodiment of the present invention. The method includes:

[0054] S11. Obtain the ambient temperature of the target vehicle, wherein the target vehicle is a vehicle equipped with an active grille shutter.

[0055] Specifically, the target vehicle can be a model under development; the ambient temperature is the air temperature corresponding to the target vehicle when verifying its energy-saving effect of adapting to the active air intake grille, which can be measured by a thermometer or temperature sensor. After obtaining the ambient temperature of the target vehicle, proceed to step S12.

[0056] S12. Evaluate the wind resistance and energy saving of the target vehicle based on the ambient temperature, and obtain the unloading sliding resistance of the target vehicle without the active air intake grille and the loading sliding resistance with the active air intake grille installed.

[0057] Specifically, different ambient temperatures result in varying wind resistance for vehicles. Therefore, corresponding wind resistance energy-saving evaluation strategies can be adopted based on ambient temperature adaptability to obtain the unloaded and loaded coasting resistance under the corresponding strategies. The unloaded coasting resistance characterizes the coasting resistance of the target vehicle without an active air intake grille. For example, the relationship between the vehicle's road coasting resistance and time, or the relationship between coasting resistance and vehicle speed, can be obtained through road coasting methods, wind tunnel drag methods, etc., ultimately fitting the formula: F1 = ax 2 +bx+c, where F1 is the unloading coasting resistance in N; x is the vehicle speed in km / h; and a is the quadratic fitting coefficient in N / (km / h). 2 b is the fitting coefficient for the first-order term, N / (km / h); c is the constant term, N; similarly, the loading and sliding resistance of the active air intake grille can also be fitted based on the test.

[0058] In practical applications, testing the skid resistance of a target vehicle equipped with an active grille shutter requires a long experimental period and a relatively harsh experimental environment. Therefore, in one specific implementation, a wind resistance and energy-saving evaluation of the target vehicle is performed based on ambient temperature to obtain the skid resistance of the target vehicle with the active grille shutter installed, including:

[0059] The first step is to obtain the vehicle drag relationship of the target vehicle without an active grille shutter at ambient temperature, as well as the first and second coasting resistances when both coasting speeds exceed a speed threshold. Ambient temperature can be defined as 23±5℃. The ambient temperature vehicle drag relationship is the correspondence between the coasting resistance and vehicle speed of the target vehicle without an active grille shutter at ambient temperature. This correspondence can be derived by fitting the road coasting method, resulting in the relationship F1 = ax. 2 +bx+c; When a vehicle is coasting, the higher its speed, the greater the impact of wind resistance. The speed threshold can be defined as above 100km / h. For example, the coasting speed of the first coasting resistance is 120km / h, and the coasting speed of the second coasting resistance is 130km / h. This can be calculated using the formula F1=ax. 2 +bx+c, calculate the first and second sliding resistances.

[0060] The second step is to obtain the first drag coefficient of the target vehicle without an active air intake grille based on the first and second coasting resistances. The first drag coefficient characterizes the air resistance coefficient of the target vehicle at room temperature without an active air intake grille, and can be expressed by the formula: Cd1 = (F... 130 -F 120)×21.15 / (130 2 -120 2 ) / A, the first drag coefficient Cd1, F is calculated. 120 For the first sliding resistance at a sliding speed of 120 km / h, F 130 The second taxiing drag is given at a taxiing speed of 130 km / h, 21.15 is the air drag conversion factor, and A is the frontal area (m²). 2 Where A = 0.81 × M × N / 10 6 In the formula: A is the windward area, m² 2 M is the vehicle width (mm); N is the vehicle length (mm); 0.81 is the empirical coefficient for calculating the frontal area. The first drag coefficient without an active air intake grille under normal temperature conditions can be calculated using the above formula.

[0061] The third step involves identifying a correlation between the first drag coefficient and the second drag coefficient of the active air intake grille. Therefore, the first drag coefficient can be converted to the second drag coefficient of the target vehicle. For example, based on experience in developing active air intake grilles, it can be determined that installation can improve the air drag coefficient by 10 counts. Thus, the second drag coefficient Cd2 can be calculated using the formula Cd2 = Cd1 - 0.01. It should be noted that the air drag coefficient can also be replaced by simulated air drag coefficient data, as long as the second drag coefficient Cd2 can be accurately converted from the first drag coefficient.

[0062] The fourth step involves obtaining the loading and sliding resistance of the target vehicle at different evaluation speeds by using the first drag coefficient, the second drag coefficient, and the relationship between the vehicle resistance at normal temperature and the drag coefficient. The relationship between the first and second drag coefficients is also the relationship between the unloading and loading sliding resistance; therefore, it can be calculated using the formula F2=(Cd2 / Cd1)ax. 2 +bx+c gives the loading sliding resistance F2.

[0063] In practical applications, since ambient temperature affects wind resistance, low ambient temperatures may lead to insufficient accuracy in calculating loading skid resistance. Therefore, in one specific implementation, when the ambient temperature is below normal, after obtaining the loading skid resistance of the target vehicle at different evaluated vehicle speeds with an active air intake grille installed based on a first drag coefficient, a second drag coefficient, and the relationship between vehicle resistance at normal temperature, the method further includes:

[0064] The loading coasting resistance is updated based on a preset coefficient, and the updated loading coasting resistance is determined as the coasting resistance of the target vehicle with an active air intake grille installed in an environment below normal temperature. The update method can be based on multiplying the preset coefficient by the loading coasting resistance at normal temperature to obtain the loading coasting resistance in a low-temperature environment. For example, the preset coefficient can be set to 1.1. It can be understood that the unloading coasting resistance and the loading coasting resistance represent the coasting resistance of the vehicle without an active air intake grille and with an active air intake grille installed, respectively. The difference between the two can be used to obtain the resistance optimization evaluation result of the active air intake grille. After obtaining the unloading coasting resistance and the loading coasting resistance, proceed to step S13.

[0065] S13. Perform fuel economy evaluation on the target vehicle under preset evaluation conditions to obtain the operating mileage under the evaluation conditions, as well as the unloading energy consumption efficiency of the target vehicle without the active air intake grille and the loading energy consumption efficiency with the active air intake grille installed.

[0066] Specifically, the evaluation operating condition refers to the operating conditions under which the target vehicle is run to evaluate fuel efficiency. This condition can be set based on evaluation requirements, such as determining the operating conditions of the target vehicle under most real-world applications, or it can be obtained from a combination of multiple operating conditions; no specific restrictions are placed here. During fuel efficiency evaluation, an environmental simulation laboratory can be used to run the target vehicle under the evaluation operating conditions on a rotating equipment. A fuel consumption meter records the fuel injection quantity data under the evaluation operating conditions, and a temperature sensor records the coolant temperature change data. The operating condition mileage is obtained based on the mileage traveled; the unloading energy efficiency and loading energy efficiency are calculated based on the fuel injection quantity data and coolant temperature change data.

[0067] In practical applications, performing wheel rotation tests on target vehicles with and without active grille shutters would be time-consuming and impractical for vehicle development, significantly limiting its application. Therefore, in one specific implementation, fuel efficiency is evaluated on the target vehicle under preset evaluation conditions to obtain unloading and loading energy efficiency, including:

[0068] The first step involves conducting a wheel spin test on the target vehicle based on the evaluation conditions to obtain the vehicle's average speed, average unloading resistance without an active grille, and average loading resistance with an active grille installed. This step can be implemented even before the active grille is manufactured; for example, a wheel spin test can be performed on a target vehicle without an active grille to obtain the average speed and average unloading resistance, and then the average loading resistance can be estimated based on the average unloading resistance. Furthermore, the various data collected during the wheel spin test are acquired and stored by sensors at preset intervals, and therefore can be expressed using the formula:

[0069] Calculate the average vehicle speed V 平均Vt is the vehicle speed at time t, in km / h; n is the speed at time t, in km / h. start To evaluate the vehicle speed at the start of the operating condition; n end This is used to evaluate the cumulative vehicle speed count at the end of the working condition.

[0070] The average resistance of unloading can be expressed by the formula Calculations show that E i Let Ws be the energy demand of the vehicle from time i-1 to time i; when F i >0, E i =F i ×d i When Fi≤0, Ei=0, F i Let N be the traction force of the vehicle from time i-1 to time i, and the formula is as follows:

[0071]

[0072] d i Let m be the distance the vehicle travels from time i-1 to time i, and the formula is as follows:

[0073]

[0074] Where Vi is the target vehicle speed at time i, in km / h; t i Time (s); TM is the vehicle's curb weight plus 100kg. Companies can also design the value of TM according to the test conditions. TM is in kg. f0, f1, and f2 are the vehicle's coasting drag coefficients, with units of N, N / (km / h), and N / (km / h)², respectively. ai is the vehicle's acceleration from time i-1 to time i, in m / s². 2 The formula is as follows:

[0075]

[0076] Based on the above formula, the average unloading resistance F can be calculated. 平均 Furthermore, considering the correspondence between unloading sliding resistance and loading sliding resistance, the loading average resistance is calculated based on the unloading average resistance.

[0077] The second step is to control the target vehicle to run at a constant speed based on the average vehicle speed and the average unloading resistance in order to carry out a constant speed and constant resistance experiment. The experiment time can be set to 30 minutes. During the experiment, data such as fuel injection quantity and water temperature are collected in real time to obtain the first running data.

[0078] The third step is to control the target vehicle to run at a constant speed based on the average vehicle speed and the average load resistance. Similarly, during the experiment, data such as fuel injection quantity and water temperature are collected in real time to obtain the second operating data.

[0079] Fourth, based on the first operating data, the unloading energy consumption efficiency can be calculated using the powertrain energy conversion efficiency formula; similarly, the loading energy consumption efficiency can be calculated based on the second operating data using the powertrain energy conversion efficiency formula.

[0080] Because the fuel injection quantity data of the target vehicle in the constant speed and constant resistance experiment covers the entire experimental data, but as the experiment progresses, the water temperature reaches a stable state and changes only slightly. If the fuel injection quantity data after the stable state is used in the calculation, it will cause insufficient accuracy in the energy consumption efficiency calculation. Based on this, in a specific implementation, the unloading energy consumption efficiency is obtained based on the first operating data, and the loading energy consumption efficiency is obtained based on the second operating data, including:

[0081] The unloading fuel injection quantity for the target vehicle without an active grille shutter is determined based on the unloading average coolant temperature from the first operating data. The unloading average coolant temperature is the average coolant temperature of the target vehicle as it rises from its initial temperature to a stable temperature without an active grille shutter. During vehicle startup, the coolant temperature gradually increases and stabilizes upon reaching a stable temperature (typically 90°C). The unloading average coolant temperature can be calculated by averaging the temperature data collected during the temperature rise process. The corresponding fuel injection quantity for the same coolant temperature is then extracted from the fuel injection quantity data based on this unloading average coolant temperature to obtain the unloading fuel injection quantity.

[0082] According to the formula The unloading energy efficiency η1 is obtained, where F1 is the average unloading resistance in N; d1 is the unloading mileage in the first operating data in m; f1 is the unloading fuel injection quantity in L; and ρ is the gasoline density in kg / m³. 3 q represents the calorific value of gasoline, in kJ / kg.

[0083] Following the same operating steps as above, the loading fuel injection quantity can be obtained. Based on the average loading water temperature, the loading fuel injection quantity for the target vehicle with active grille shutters is determined from the second operating data. The average loading water temperature is the average water temperature of the target vehicle as it rises from its initial temperature to a stable temperature when the active grille shutters are installed, which can be calculated based on the average unloading water temperature. Then, according to the formula... The loading energy consumption efficiency η2 is obtained, where F2 is the average loading resistance, d2 is the loading mileage in the second operating data, f2 is the loading fuel injection quantity, ρ is the fuel density, and q is the fuel calorific value.

[0084] When an active grille shutter is not yet manufactured, the average loading coolant temperature calculated based on the average unloading coolant temperature may be inaccurate. Therefore, in one specific embodiment, before determining the unloading fuel injection quantity for a target vehicle without an active grille shutter based on the average unloading coolant temperature in the first operating data when the ambient temperature is below normal, the method further includes:

[0085] Obtain the unloading average water temperature and the loading average water temperature. Specifically, control the target vehicle without an active grille shutter to start and run under evaluation conditions to obtain the first temperature rise time from the initial water temperature to the stable water temperature, the stable temperature (usually 90℃), the operating time under conditions, and the unloading average water temperature. The vehicle can be started and run in a ring mold test chamber using a whole vehicle rotating device, with an engine water temperature sensor and an engine fuel consumption meter installed. The test process, as briefly described above, goes through two main stages: the water temperature rise process and the water temperature stabilization process, thus obtaining the above parameters.

[0086] Simulation tests are conducted on the active air intake grille to obtain the time optimization ratio, which is the ratio of the warm-up time of the target vehicle with the active air intake grille installed to the warm-up time without it. The time optimization ratio characterizes the ratio of warm-up time between the two systems. Then, according to the formula t2 = t1 × (1 - α), the second temperature rise time t2 of the target vehicle with the active air intake grille installed is obtained, where t1 is the first temperature rise time and α is the time optimization ratio. According to the formula T2 = (T1 × t2 + T0 × (t0 - t2)) / t0, the average loading water temperature T2 is obtained, where T1 is the average unloading water temperature, t2 is the second temperature rise time, T0 is the stable temperature, and t0 is the operating time under operating conditions. By accurately obtaining the average unloading water temperature and the average loading water temperature, the unloading energy efficiency and the loading energy efficiency are calculated based on the above methods. After obtaining the unloading energy efficiency and the loading energy efficiency, the process proceeds to step S14.

[0087] S14. Based on the unloading sliding resistance, the loading sliding resistance, the operating mileage, the unloading energy consumption efficiency, and the loading energy consumption efficiency, determine the energy saving of the target vehicle by the active air intake grille.

[0088] Specifically, the unloading energy efficiency of the target vehicle without an active grille can be calculated by unloading coasting resistance, operating mileage, and unloading energy efficiency; the loading energy efficiency can be calculated by loading coasting resistance, operating mileage, and loading energy efficiency. The energy savings can be derived from the difference between the unloading energy efficiency and the loading energy efficiency.

[0089] In one example, the process includes: First, obtaining the first energy consumption E1 (in L / 100km) without an active grille, using the formula E1 = F3 × D / η1, where F3 is the unloading coasting resistance and η1 is the unloading energy efficiency; Second, obtaining the second energy consumption E2 (with an active grille installed), using the formula E2 = F4 × D / η2, where F4 is the loading energy efficiency and η2 is the loading energy efficiency; Third, obtaining the energy savings based on the difference between the first and second energy consumptions. This completes the evaluation of the energy-saving effect of the active grille. The evaluation results can be used in vehicle development projects for decomposing overall vehicle performance system indicators, formulating and optimizing active grille technology solutions, and other related work, demonstrating significant engineering application value and promising prospects in the field of energy conservation.

[0090] Based on the same inventive concept as the evaluation method, embodiments of the present invention also provide an energy-saving effect evaluation device. Please refer to [link to relevant documentation]. Figure 3 The device includes:

[0091] The acquisition module 301 is used to acquire the ambient temperature of the target vehicle, wherein the target vehicle is a vehicle equipped with an active grille shutter.

[0092] The first obtaining module 302 is used to evaluate the wind resistance and energy saving of the target vehicle based on the ambient temperature, and to obtain the unloading sliding resistance of the target vehicle without the active air intake grille and the loading sliding resistance with the active air intake grille installed.

[0093] The second obtaining module 303 is used to evaluate the fuel efficiency of the target vehicle under preset evaluation conditions, obtain the operating mileage of the evaluation conditions, and the unloading energy consumption efficiency of the target vehicle without the active air intake grille and the loading energy consumption efficiency with the active air intake grille installed.

[0094] The determining module 304 is used to determine the energy saving of the target vehicle by the active air intake grille based on the unloading sliding resistance, the loading sliding resistance, the operating mileage, the unloading energy consumption efficiency, and the loading energy consumption efficiency.

[0095] In an optional embodiment, the first obtaining module includes:

[0096] The acquisition submodule is used to acquire the ambient temperature vehicle resistance relationship of the target vehicle without the active air intake grille, and the first gliding resistance and the second gliding resistance when the gliding speed is greater than the speed threshold, when the ambient temperature is normal temperature. The ambient temperature vehicle resistance relationship is the correspondence between the gliding resistance and the vehicle speed of the target vehicle without the active air intake grille at normal temperature.

[0097] The first obtaining submodule is used to obtain a first drag coefficient for the target vehicle without the active air intake grille based on the first gliding resistance and the second gliding resistance.

[0098] A conversion submodule is used to convert the first drag coefficient into a second drag coefficient for the target vehicle with the active air intake grille installed.

[0099] The second acquisition submodule is used to obtain the loading and sliding resistance of the target vehicle at different evaluation vehicle speeds when the active air intake grille is installed, based on the first drag coefficient, the second drag coefficient, and the normal temperature vehicle resistance relationship.

[0100] In an optional embodiment, when the ambient temperature is lower than the normal temperature environment, the first obtaining module further includes:

[0101] The update determination submodule is used to update the loading sliding resistance according to a preset coefficient, and determine the updated loading sliding resistance as the sliding resistance of the target vehicle when the active air intake grille is loaded in an environment below the normal temperature.

[0102] In one optional embodiment, the second obtaining module includes:

[0103] The third acquisition submodule is used to perform a hub test on the target vehicle according to the evaluation conditions to obtain the average vehicle speed, the average unloading resistance without the active air intake grille and the average loading resistance with the active air intake grille installed.

[0104] The fourth submodule is used to control the target vehicle to run at a constant speed based on the average vehicle speed and the average unloading resistance, thereby obtaining the first operating data;

[0105] The fifth submodule is used to control the target vehicle to run at a constant speed based on the average vehicle speed and the average load resistance, thereby obtaining second operating data;

[0106] The sixth obtaining submodule is used to obtain the unloading energy consumption efficiency based on the first operating data and the loading energy consumption efficiency based on the second operating data.

[0107] In an optional embodiment, the sixth obtaining submodule includes:

[0108] The determining unit is used to determine the unloading fuel injection amount of the target vehicle without the active air intake grille in the first operating data based on the unloading average water temperature, wherein the unloading average water temperature is the average water temperature of the target vehicle when the active air intake grille is not installed, as the water temperature rises from the initial water temperature to the stable water temperature.

[0109] The first obtaining unit is used according to the formula. The unloading energy efficiency η1 is obtained, where F1 is the average unloading resistance, d1 is the unloading running mileage in the first running data, and f1 is the unloading fuel injection quantity.

[0110] The determining unit is used to determine the amount of fuel injection required for the target vehicle to install the active air intake grille based on the average loading water temperature in the second operating data, wherein the average loading water temperature is the average water temperature of the target vehicle as it rises from the initial water temperature to the stable water temperature when the active air intake grille is installed;

[0111] The second obtaining unit is used to obtain according to the formula. The loading energy efficiency η2 is obtained, where F2 is the average loading resistance, d2 is the loading mileage in the second operating data, f2 is the loading fuel injection quantity, ρ is the fuel density, and q is the fuel calorific value.

[0112] In an optional embodiment, when the ambient temperature is lower than the normal temperature environment, the sixth obtaining submodule further includes:

[0113] The third obtaining unit is used to control the target vehicle without the active air intake grille to start and run under the evaluation conditions, so as to obtain the first heating time, stable temperature, operating time and unloading average water temperature of the target vehicle from the initial water temperature to the stable water temperature.

[0114] The fourth obtaining unit is used to perform simulation testing on the active air intake grille to obtain the time optimization ratio, wherein the time optimization ratio is the ratio of the warm-up time of the target vehicle with the active air intake grille installed to the warm-up time without the active air intake grille installed.

[0115] The fifth obtaining unit is used to obtain the second heating time t2 of the target vehicle when the active air intake grille is installed according to the formula t2=t1×(1-α), where t1 is the first heating time and α is the time optimization ratio;

[0116] The sixth obtaining unit is used to obtain the loading average water temperature T2 according to the formula T2=(T1×t2+T0×(t0-t2)) / t0, where T1 is the unloading average water temperature, t2 is the second heating time, T0 is the stable temperature, and t0 is the operating time under the working condition.

[0117] In one optional embodiment, the determining module includes:

[0118] The seventh submodule is used to obtain the first energy consumption E1 without the active air intake grille installed according to the formula E1=F3×D / η1, where F3 is the unloading sliding resistance and η1 is the unloading energy consumption efficiency.

[0119] The eighth submodule is used to obtain the second energy consumption E2 of installing the active air intake grille according to the formula E2=F4×D / η2, where F4 is the loading energy consumption efficiency and η2 is the loading energy consumption efficiency;

[0120] The ninth submodule is used to obtain the energy saving based on the difference between the first energy consumption and the second energy consumption.

[0121] Based on the same inventive concept as the evaluation method, embodiments of the present invention also provide an electronic device, including a processor and a memory, wherein the memory is coupled to the processor and stores instructions that, when executed by the processor, cause the electronic device to perform the steps of any of the methods in the evaluation method.

[0122] Based on the same inventive concept as the evaluation method, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the evaluation methods.

[0123] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0124] 1. By rationally decomposing the evaluation indicators when calculating the energy-saving effect of the active air intake grille, and calculating separately based on the states of having an active air intake grille installed and not having one, the technical route of the entire evaluation process is more scientific and complete, enabling accurate quantitative assessment of energy savings, thereby improving the accuracy of the evaluation of the energy-saving effect of the main air intake grille.

[0125] 2. This method can solve the problem of accurately and quantitatively evaluating the drag and warm-up process optimization before the active air intake grille is installed. At the same time, it can solve the problem of quantitatively evaluating the powertrain efficiency under different water temperatures, different drag loads, and different vehicle speeds in the whole vehicle environment. The whole process is appropriately combined with simulation methods, so that the evaluation results have the characteristics of high efficiency and high confidence. Finally, the calculation results of the energy saving effect of the active air intake grille are scientific and reasonable.

[0126] 3. This method can complete all evaluation work within two days without affecting the original project development cycle; moreover, the technical principle is simple and the technical cost is low.

[0127] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0128] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0129] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0130] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0131] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0132] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for evaluating energy-saving performance, characterized in that, The method includes: Obtain the ambient temperature of the target vehicle, wherein the target vehicle is a vehicle equipped with an active grille shutter; Based on the ambient temperature, the wind resistance and energy saving of the target vehicle are evaluated to obtain the unloading sliding resistance of the target vehicle without the active air intake grille and the loading sliding resistance with the active air intake grille installed. The target vehicle is evaluated for fuel efficiency under preset evaluation conditions to obtain the mileage under the evaluation conditions, as well as the unloading energy efficiency of the target vehicle without the active grille and the loading energy efficiency with the active grille installed. The energy savings of the active air intake grille for the target vehicle are determined based on the unloading coasting resistance, the loading coasting resistance, the operating mileage, the unloading energy efficiency, and the loading energy efficiency.

2. The method for evaluating energy-saving effect according to claim 1, characterized in that, The step of evaluating the wind resistance and energy efficiency of the target vehicle based on the ambient temperature to obtain the loading and sliding resistance of the target vehicle with the active air intake grille installed includes: When the ambient temperature is normal, the vehicle resistance relationship of the target vehicle without the active air intake grille is obtained, as well as the first gliding resistance and the second gliding resistance when the gliding speed is greater than the speed threshold. The vehicle resistance relationship at normal temperature is the correspondence between the gliding resistance and the vehicle speed of the target vehicle without the active air intake grille at normal temperature. Based on the first gliding resistance and the second gliding resistance, a first drag coefficient is obtained for the target vehicle without the active air intake grille installed. The first drag coefficient is converted into a second drag coefficient for the target vehicle when the active air intake grille is installed. Based on the first drag coefficient, the second drag coefficient, and the normal temperature vehicle resistance relationship, the loading and sliding resistance of the target vehicle when the active air intake grille is installed at different evaluated vehicle speeds is obtained.

3. The method for evaluating energy-saving effect according to claim 2, characterized in that, When the ambient temperature is lower than the normal temperature environment, after obtaining the loading and sliding resistance of the target vehicle at different evaluated vehicle speeds by installing the active air intake grille based on the first drag coefficient, the second drag coefficient, and the normal temperature vehicle resistance relationship, the method further includes: The loading and sliding resistance is updated according to a preset coefficient, and the updated loading and sliding resistance is determined as the sliding resistance of the target vehicle when the active air intake grille is loaded in an environment below the normal temperature.

4. The method for evaluating energy-saving effect according to claim 1, characterized in that, Under preset evaluation conditions, the target vehicle is evaluated for fuel efficiency to obtain the unloading energy efficiency and the loading energy efficiency, including: The target vehicle is subjected to a wheel rotation test based on the evaluation conditions to obtain the average vehicle speed, the average unloading resistance without the active air intake grille, and the average loading resistance with the active air intake grille installed. Based on the average vehicle speed and the average unloading resistance, the target vehicle is controlled to run at a constant speed to obtain the first operating data; The target vehicle is controlled to run at a constant speed based on the average vehicle speed and the average load resistance to obtain second operating data. The unloading energy efficiency is obtained based on the first operating data, and the loading energy efficiency is obtained based on the second operating data.

5. The method for evaluating energy-saving effect according to claim 4, characterized in that, Obtaining the unloading energy efficiency based on the first operating data and the loading energy efficiency based on the second operating data includes: The unloading fuel injection amount for the target vehicle without the active grille is determined in the first operating data based on the unloading average water temperature, wherein the unloading average water temperature is the average water temperature of the target vehicle when the active grille is not installed, as the water temperature rises from the initial water temperature to the stable water temperature. According to the formula Obtain unloading energy efficiency η 1, among which, F 1 represents the average unloading resistance. d 1 represents the unloading mileage in the first running data. f 1 represents the unloading fuel injection quantity; The loading fuel injection amount for installing the active grille on the target vehicle is determined in the second operating data based on the average loading water temperature, wherein the average loading water temperature is the average water temperature of the target vehicle as it rises from the initial water temperature to the stable water temperature when the active grille is installed; According to the formula To obtain loading energy efficiency η 2, of which, F 2 represents the average resistance of the load. d 2 represents the loading and running mileage in the second running data. f 2 represents the amount of fuel injected. ρ For fuel density, q This refers to the calorific value of fuel oil.

6. The method for evaluating energy-saving effect according to claim 4, characterized in that, When the ambient temperature is below normal temperature, before determining the unloading fuel injection quantity for the target vehicle without the active grille based on the average unloading water temperature in the first operating data, the method further includes: The target vehicle without the active air intake grille is started and operated under the evaluation conditions to obtain the first heating time, stable temperature, operating time and unloading average water temperature of the target vehicle as it rises from the initial water temperature to the stable water temperature. The active air intake grille was simulated and tested to obtain a time optimization ratio, wherein the time optimization ratio is the ratio of the warm-up time of the target vehicle with the active air intake grille installed to the warm-up time without the active air intake grille installed. According to the formula The second heating time of the target vehicle with the active air intake grille installed is obtained. t 2, of which, t 1 represents the first temperature rise time. α Optimize the ratio for the time; According to the formula Obtain the average water temperature of the load. T 2, of which, T 1 represents the average unloading water temperature. t 2 represents the second heating time. T 0 represents the stable temperature. t 0 represents the operating time under the stated operating condition.

7. The method for evaluating energy-saving effect according to claim 1, characterized in that, The step of determining the energy savings of the active air intake grille for the target vehicle based on the unloading coasting resistance, the loading coasting resistance, the operating mileage, the unloading energy efficiency, and the loading energy efficiency includes: According to the formula E 1 =F 3 ×D / η 1. Obtain the first energy consumption without the active air intake grille installed. E 1, among which, F 3 represents the unloading sliding resistance. η 1 represents the unloading energy efficiency; According to the formula E 2 =F 4 ×D / η 2. Obtain the second energy consumption of the active air intake grille. E 2, of which, F 4 represents the loading energy efficiency. η 2 represents the loading energy efficiency; The energy saving is obtained based on the difference between the first energy consumption and the second energy consumption.

8. An energy-saving effect evaluation device, characterized in that, The device includes: The acquisition module is used to acquire the ambient temperature of the target vehicle, wherein the target vehicle is a vehicle equipped with an active grille shutter; The first obtaining module is used to evaluate the wind resistance and energy saving of the target vehicle based on the ambient temperature, and to obtain the unloading sliding resistance of the target vehicle without the active air intake grille and the loading sliding resistance with the active air intake grille installed. The second acquisition module is used to evaluate the fuel efficiency of the target vehicle under preset evaluation conditions, and to obtain the mileage of the evaluation conditions, as well as the unloading energy consumption efficiency of the target vehicle without the active air intake grille and the loading energy consumption efficiency with the active air intake grille installed. The determination module is used to determine the energy saving of the target vehicle by the active air intake grille based on the unloading coasting resistance, the loading coasting resistance, the operating mileage, the unloading energy consumption efficiency, and the loading energy consumption efficiency.

9. An electronic device, characterized in that, The device includes a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method described in any one of claims 1-7.

Images