A method and system for determining an operating point of an automotive range extender, and a vehicle

Abstract

The application provides a kind of automobile range extender working point determination method, system and vehicle, it is related to automobile control technical field, the first target power generation curve obtained by monomer energy consumption test is combined with the second target power generation curve obtained by monomer vibration noise test, to determine the comprehensive target power generation curve, and the initial working point corresponding to the comprehensive target power generation curve is used to control the range extender to run, to obtain the first NVH data, finally, according to the first NVH data, the target working point of the range extender is determined, when determining the target working point of the range extender, not only the influence of energy consumption is considered, but also the influence of NVH data is considered, so that the target working point determined meets the energy consumption economy requirement of the whole vehicle, and meets the NVH performance requirement of the whole vehicle, improves the satisfaction of users.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile control, and in particular to a method and system for determining a working point of an automobile range extender and a vehicle. BACKGROUND

[0002] With the increasing proportion of new energy vehicles (mainly including pure electric vehicles, hybrid electric vehicles, range extended electric vehicles and fuel cell vehicles) in the market, the pure electric vehicles have the problems of short endurance and difficult charging due to the development of battery technology and charging piles; the hybrid electric vehicles have complex power systems, high purchase and maintenance costs; the fuel cell vehicles have the problems of low energy efficiency and few fuel supply stations, which limit their further development. The range extended electric vehicles can run on oil and electricity, run on pure electricity in urban areas and run on oil at high speed, have no endurance range anxiety, and also take into account the cost of using the vehicle, which has become the mainstream development trend in the current market.

[0003] At present, after analyzing the road test data and user feedback information of the range extended electric vehicles, the following conclusions are drawn: the vibration and noise of the whole vehicle are at a low level when running in pure electric mode; the vibration and noise generated by the range extender when running normally in range extension mode are more significant, which affects the driving experience of the people in the vehicle. Moreover, the current vehicle control strategy in range extension mode mainly focuses on economy, while ignoring the suppression of vibration and noise.

[0004] Therefore, there is an urgent need for a new method for determining the working point of an automobile range extender. SUMMARY

[0005] In view of the above problems, the embodiments of the present application provide a method and system for determining the working point of an automobile range extender and a vehicle, so as to overcome the above problems or at least partially solve the above problems.

[0006] In a first aspect, the embodiments of the present application provide a method for determining the working point of an automobile range extender, the method comprising:

[0007] determining a first target power generation curve of a range extender of a target test vehicle by performing a range extender single-body energy consumption bench test on the range extender of the target test vehicle;

[0008] determining a second target power generation curve of the range extender by performing a range extender single-body vibration and noise bench test on the range extender of the target test vehicle;

[0009] determining a comprehensive target power generation curve of the range extender according to the first target power generation curve and the second target power generation curve;

[0010] controlling the range extender of the target test vehicle to operate at each initial operating point on the comprehensive target power generation curve in turn, and recording first NVH data of the range extender during the operation;

[0011] determining a plurality of target operating points of the range extender according to the first NVH data.

[0012] Optionally, after determining the plurality of target operating points of the range extender, the method further comprises:

[0013] respectively acquiring operating parameters corresponding to each of the target operating points;

[0014] determining oil-electricity conversion rates corresponding to each of the target operating points according to the operating parameters corresponding to each of the target operating points;

[0015] respectively assigning respective weights to the oil-electricity conversion rates corresponding to each of the target operating points;

[0016] determining a comprehensive oil-electricity conversion rate of the range extender according to the target operating points and the weights corresponding to each of the target operating points;

[0017] adjusting the weights and / or the operating parameters corresponding to each of the target operating points according to the comprehensive oil-electricity conversion rate.

[0018] Optionally, the adjusting the weights and / or the operating parameters corresponding to each of the target operating points according to the comprehensive oil-electricity conversion rate comprises:

[0019] determining whether the comprehensive oil-electricity conversion rate is greater than or equal to a preset oil-electricity conversion rate threshold;

[0020] if the comprehensive oil-electricity conversion rate is greater than or equal to the preset oil-electricity conversion rate threshold, retaining the plurality of target operating points;

[0021] if the comprehensive oil-electricity conversion rate is less than the preset oil-electricity conversion rate threshold, adjusting the weights and / or the operating parameters corresponding to at least one of the target operating points so that the comprehensive oil-electricity conversion rate is greater than or equal to the preset oil-electricity conversion rate threshold.

[0022] Optionally, the determining the second target power generation curve of the range extender of the target test vehicle through the range extender single-body vibration noise bench test of the range extender of the target test vehicle comprises:

[0023] respectively acquiring second NVH data of the range extender of the target test vehicle under different accelerator pedal opening degrees through the range extender single-body vibration noise bench test of the range extender of the target test vehicle;

[0024] According to the second NVH data, a second target power generation curve of the range extender is determined.

[0025] Optionally, after the second target power generation curve of the range extender is determined, the method further comprises:

[0026] An overall vehicle modal frequency planning table of the target test vehicle is obtained.

[0027] According to the overall vehicle modal frequency planning table, each working point in the second target power generation curve is simulated and analyzed.

[0028] Based on the simulation and analysis results of each working point in the second target power generation curve, the second target power generation curve is optimized.

[0029] Optionally, the first target power generation curve of the range extender of the target test vehicle is determined by performing a range extender single-body energy consumption bench test on the range extender of the target test vehicle, comprising:

[0030] The range extender universal characteristic curve is determined by performing the range extender single-body energy consumption bench test on the range extender of the target test vehicle, the range extender universal characteristic curve being a collection of a speed curve, a power curve and a torque curve.

[0031] The range extender universal characteristic curve is analyzed to determine a plurality of working points in the range extender universal characteristic curve that meet a first preset condition.

[0032] According to the plurality of working points that meet the first preset condition, a theoretical power generation curve of the range extender is determined.

[0033] According to the theoretical power generation curve, a first actual power generation curve is determined as a target to meet a second preset condition, and a second actual power generation curve is determined as a target to meet a third preset condition.

[0034] According to the first actual power generation curve and the second actual power generation curve, the first target power generation curve is determined as a target to meet the third preset condition.

[0035] The first preset condition is that the theoretical speed is greater than or equal to a first preset speed, the theoretical torque is greater than or equal to a first preset torque, and the theoretical power is greater than or equal to a first preset power. The second preset condition is that the actual power is greater than or equal to a second preset power, and the actual torque is greater than or equal to a second preset torque. The third preset condition is that the actual battery power is greater than or equal to a preset battery power.

[0036] Optionally, the comprehensive target power generation curve of the range extender is determined according to the first target power generation curve and the second target power generation curve, comprising:

[0037] According to the first target power generation curve and the second target power generation curve, a comprehensive target power generation curve of the range extender is determined, so as to meet a fourth preset condition.

[0038] The fourth preset condition is that actual energy consumption is less than or equal to preset energy consumption, and actual NVH data is less than or equal to preset NVH data.

[0039] Optionally, the method further comprises:

[0040] The target working points corresponding to the comprehensive oil-electric conversion rate greater than or equal to the preset oil-electric conversion rate threshold are applied to a plurality of mass production vehicles for real vehicle testing;

[0041] The plurality of mass production vehicles are controlled to run at the plurality of target working points respectively, and third NVH data of each mass production vehicle running at each working point is recorded respectively;

[0042] The third NVH data of the plurality of mass production vehicles are analyzed, and the weight and / or running parameter corresponding to at least one of the plurality of target working points are adjusted according to the analysis result.

[0043] In a second aspect, an automobile range extender working point determination system is provided, and the system comprises:

[0044] A first determination module is configured to determine a first target power generation curve of a range extender of a target test vehicle by performing a range extender single-body energy consumption bench test on the range extender of the target test vehicle;

[0045] A second determination module is configured to determine a second target power generation curve of the range extender by performing a range extender single-body vibration and noise bench test on the range extender of the target test vehicle;

[0046] A third determination module is configured to determine a comprehensive target power generation curve of the range extender according to the first target power generation curve and the second target power generation curve;

[0047] A control module is configured to control the range extender of the target test vehicle to run at each initial working point on the comprehensive target power generation curve in sequence, and record first NVH data of the range extender during the running;

[0048] A fourth determination module is configured to determine a plurality of target working points of the range extender according to the first NVH data.

[0049] Optionally, the system further comprises:

[0050] A first acquisition sub-module is configured to acquire running parameters corresponding to each target working point respectively.

[0051] a first determining sub-module, configured to determine an oil-electric conversion rate corresponding to each of the target operating points according to an operating parameter corresponding to each of the target operating points;

[0052] an assigning sub-module, configured to assign a weight corresponding to each of the target operating points to the oil-electric conversion rate corresponding to each of the target operating points respectively;

[0053] a second determining sub-module, configured to determine a comprehensive oil-electric conversion rate of the range extender according to each of the target operating points and the weight corresponding to each of the target operating points;

[0054] a first adjusting sub-module, configured to adjust the weight and / or the operating parameter corresponding to each of the target operating points according to the comprehensive oil-electric conversion rate.

[0055] Optionally, the first adjusting sub-module, when adjusting the weight and / or the operating parameter corresponding to each of the target operating points according to the comprehensive oil-electric conversion rate, comprises:

[0056] a judging sub-unit, configured to judge whether the comprehensive oil-electric conversion rate is greater than or equal to a preset oil-electric conversion rate threshold;

[0057] a retaining sub-unit, configured to retain the target operating points if the comprehensive oil-electric conversion rate is greater than or equal to the preset oil-electric conversion rate threshold;

[0058] an adjusting sub-unit, configured to adjust the weight and / or the operating parameter corresponding to at least one of the target operating points if the comprehensive oil-electric conversion rate is less than the preset oil-electric conversion rate threshold, so that the comprehensive oil-electric conversion rate is greater than or equal to the preset oil-electric conversion rate threshold.

[0059] Optionally, the second determining module, when determining the second target power generation curve of the range extender of the target test vehicle through the range extender single-body vibration noise bench test, comprises:

[0060] a second acquiring sub-module, configured to acquire second NVH data of the range extender of the target test vehicle under different accelerator openings through the range extender single-body vibration noise bench test;

[0061] a third determining sub-module, configured to determine the second target power generation curve of the range extender according to the second NVH data.

[0062] Optionally, after the second target power generation curve of the range extender is determined, the system further comprises:

[0063] a third obtaining sub-module, configured to obtain a whole vehicle modal frequency planning table of the target test vehicle;

[0064] a simulation analysis sub-module, configured to perform simulation analysis on each working point in the second target power generation curve according to the whole vehicle modal frequency planning table;

[0065] an optimization sub-module, configured to optimize the second target power generation curve based on the simulation analysis result of each working point in the second target power generation curve.

[0066] Optionally, the first target power generation curve of the range extender of the target test vehicle is determined through a range extender single-body energy consumption bench test on the range extender of the target test vehicle, and the first determining module comprises:

[0067] a fourth determining sub-module, configured to determine a universal characteristic curve of the range extender through the range extender single-body energy consumption bench test on the range extender of the target test vehicle, the universal characteristic curve being a collection of a speed curve, a power curve and a torque curve;

[0068] a fifth determining sub-module, configured to analyze the universal characteristic curve and determine a plurality of working points in the universal characteristic curve that meet a first preset condition;

[0069] a sixth determining sub-module, configured to determine a theoretical power generation curve of the range extender according to the plurality of working points that meet the first preset condition;

[0070] a seventh determining sub-module, configured to determine a first actual power generation curve by taking meeting a second preset condition as a target according to the theoretical power generation curve, and determine a second actual power generation curve by taking meeting a third preset condition as a target;

[0071] an eighth determining sub-module, configured to determine the first target power generation curve by taking meeting the third preset condition as a target according to the first actual power generation curve and the second actual power generation curve;

[0072] wherein the first preset condition is that a theoretical speed is greater than or equal to a first preset speed, a theoretical torque is greater than or equal to a first preset torque, and a theoretical power is greater than or equal to a first preset power, the second preset condition is that an actual power is greater than or equal to a second preset power, and an actual torque is greater than or equal to a second preset torque, and the third preset condition is that an actual battery power is greater than or equal to a preset battery power.

[0073] Optionally, the third determining module comprises:

[0074] a ninth determining sub-module, configured to determine a comprehensive target power generation curve of the range extender according to the first target power generation curve and the second target power generation curve, so as to meet a fourth preset condition;

[0075] wherein the fourth preset condition is that actual energy consumption is less than or equal to preset energy consumption, and actual NVH data is less than or equal to preset NVH data.

[0076] Optionally, the system further comprises:

[0077] a testing sub-module, configured to apply a plurality of target working points corresponding to the comprehensive fuel-electric conversion rate greater than or equal to the preset fuel-electric conversion rate threshold to a plurality of mass-produced vehicles for real vehicle testing;

[0078] a control sub-module, configured to control the plurality of mass-produced vehicles to run at the plurality of target working points respectively, and record third NVH data of each of the mass-produced vehicles when running at each working point respectively;

[0079] a second adjusting sub-module, configured to analyze the third NVH data of the plurality of mass-produced vehicles, and adjust a weight and / or running parameter corresponding to at least one of the plurality of target working points according to an analysis result.

[0080] In a third aspect, an embodiment of the present application provides a vehicle, comprising:

[0081] one or more processors; and

[0082] one or more computer readable media having instructions stored thereon that, when executed by the one or more processors, cause the vehicle to perform the method for determining a working point of an automotive range extender as described in the first aspect of the present application.

[0083] The present application has the following beneficial effects:

[0084] The application provides a method for determining a working point of an automobile range extender, and the method comprises the following steps: determining a first target power generation curve of a range extender of a target test vehicle by performing a range extender single-body energy consumption bench test on the range extender of the target test vehicle; determining a second target power generation curve of the range extender by performing a range extender single-body vibration noise bench test on the range extender of the target test vehicle; determining a comprehensive target power generation curve of the range extender according to the first target power generation curve and the second target power generation curve; controlling the range extender of the target test vehicle to run at each initial working point on the comprehensive target power generation curve in sequence, and recording first NVH data of the range extender in the running process; and determining a plurality of target working points of the range extender according to the first NVH data. The first target power generation curve obtained through the single-body energy consumption bench test is combined with the second target power generation curve obtained through the single-body vibration noise bench test to determine the comprehensive target power generation curve, the range extender is controlled to run through the initial working points corresponding to the comprehensive target power generation curve to obtain the first NVH data, and finally the target working points of the range extender are determined according to the first NVH data. In the process of determining the target working points of the range extender, not only the influence of energy consumption is considered, but also the influence of NVH data is considered, so that the determined target working points not only meet the energy consumption economy requirement of the whole vehicle, but also meet the NVH performance requirement of the whole vehicle, and the satisfaction of users is improved. BRIEF DESCRIPTION OF DRAWINGS

[0085] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0086] Figure 1 It is a step flow schematic diagram of a method for determining a working point of an automobile range extender provided by the embodiments of the application.

[0087] Figure 2 It is a schematic diagram of a range extender single-body vibration noise bench test for determining a second target power generation curve provided by the embodiments of the application.

[0088] Figure 3 It is a schematic diagram of a whole vehicle frequency planning table provided by the embodiments of the application.

[0089] Figure 4 It is a whole vehicle modal frequency planning flow chart diagram provided by the embodiments of the application.

[0090] Figure 5 It is a range extender bench test MAP diagram provided by the embodiments of the application.

[0091] Figure 6 is a target working point oil-electric conversion rate weight assignment schematic diagram provided by an embodiment of the present application;

[0092] Figure 7 is a driver right ear noise test result schematic diagram under different idling provided by an embodiment of the present application;

[0093] Figure 8 is a middle row right side passenger right ear noise test result schematic diagram under different idling provided by an embodiment of the present application;

[0094] Figure 9 is a rear row right side passenger right ear noise test result schematic diagram under different idling provided by an embodiment of the present application;

[0095] Figure 10 is a steering wheel vibration test result schematic diagram under different charging power provided by an embodiment of the present application;

[0096] Figure 11 is a seat rail vibration test result schematic diagram under different charging power provided by an embodiment of the present application;

[0097] Figure 12 is a driving state in-vehicle noise test result schematic diagram provided by an embodiment of the present application;

[0098] Figure 13 is a driving state steering wheel vibration test result schematic diagram provided by an embodiment of the present application;

[0099] Figure 14 is a driving state seat rail vibration test result schematic diagram provided by an embodiment of the present application;

[0100] Figure 15 is a schematic diagram of a system for determining a working point of an automobile range extender provided by an embodiment of the present application. DETAILED DESCRIPTION

[0101] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings so as to be more thoroughly understood. Although exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application can be more thoroughly understood, and the scope of the present application can be accurately conveyed to those skilled in the art.

[0102] Based on the above problems, the first aspect of an embodiment of the present application provides a method for determining a working point of an automobile range extender, the method being as follows Figure 1 comprises:

[0103] In step S101, a first target power generation curve of the range extender of the target test vehicle is determined by performing a range extender single-body energy consumption bench test on the range extender of the target test vehicle.

[0104] The bench test is a test performed in a laboratory, and a special bench is used to simulate the driving conditions of the vehicle. The range extender is installed on the bench, and the load and operating conditions of the bench are controlled to simulate the operating state of the vehicle under different working conditions.

[0105] In this step, the range extender of the target test vehicle is installed on the test bench, and a range extender single-body energy consumption bench test is performed on the range extender of the target test vehicle. According to the test data of the range extender single-body energy consumption bench test, a first target power generation curve of the range extender of the target test vehicle is determined.

[0106] In a preferred embodiment, the first target power generation curve of the range extender of the target test vehicle is determined by performing a range extender single-body energy consumption bench test on the range extender of the target test vehicle, comprising:

[0107] The universal characteristic curve of the range extender is determined by performing the range extender single-body energy consumption bench test on the range extender of the target test vehicle, and the universal characteristic curve is a collection of a speed curve, a power curve and a torque curve;

[0108] The universal characteristic curve is analyzed to determine a plurality of working points in the universal characteristic curve that satisfy a first preset condition;

[0109] A theoretical power generation curve of the range extender is determined according to the plurality of working points that satisfy the first preset condition;

[0110] A first actual power generation curve is determined according to the theoretical power generation curve, with a second preset condition being satisfied as the target, and a second actual power generation curve is determined with a third preset condition being satisfied as the target;

[0111] The first target power generation curve is determined according to the first actual power generation curve and the second actual power generation curve, with the third preset condition being satisfied as the target;

[0112] The first preset condition is that the theoretical speed is greater than or equal to a first preset speed, the theoretical torque is greater than or equal to a first preset torque, and the theoretical power is greater than or equal to a first preset power. The second preset condition is that the actual power is greater than or equal to a second preset power, and the actual torque is greater than or equal to a second preset torque. The third preset condition is that the actual battery power is greater than or equal to a preset battery power.

[0113] Specifically, in this embodiment, the detailed process of determining the first target power generation curve of the range extender of the target test vehicle by the range extender single-body energy consumption bench test is described, and the specific process is as follows:

[0114] The speed, power and torque of the range extender of the target test vehicle in different operating states are recorded through a range extender single-body energy consumption bench test to draw a universal characteristic curve, wherein the universal characteristic curve is a collection of speed curve, power curve and torque curve.

[0115] Further, a first preset condition is set, the first preset condition is that the theoretical speed is greater than or equal to a first preset speed, and the theoretical torque is greater than or equal to a first preset torque and the theoretical power is greater than or equal to a first preset power. According to the set first preset condition, a plurality of working points meeting the first preset condition are selected from the universal characteristic curve through analysis.

[0116] Further, according to the working points meeting the first preset condition selected from the universal characteristic curve, the working points are connected to obtain a theoretical power generation curve.

[0117] Further, a second preset condition and a third preset condition are set respectively, wherein the second preset condition is that the actual power is greater than or equal to a second preset power, and the actual torque is greater than or equal to a second preset torque; the third preset condition is that the actual battery power is greater than or equal to a preset battery power. According to the set second preset condition and third preset condition, the working point is further adjusted on the basis of the theoretical power generation curve to obtain a first actual power generation curve, so as to meet the second preset condition; according to the set third preset condition, the working point is further adjusted on the basis of the theoretical power generation curve to obtain a second actual power generation curve, so as to meet the third preset condition.

[0118] Further, the first target power generation curve is finally determined by comprehensively considering the first actual power generation curve and the second actual power generation curve. It should be noted that the first target power generation curve is the best power generation power reference of the range extender in actual operation, which comprehensively considers the power demand of the vehicle, the fuel efficiency and the charging state of the battery, etc.

[0119] In step S102, the second target power generation curve of the range extender is determined through a range extender single-body vibration noise bench test of the range extender of the target test vehicle.

[0120] In this step, the range extender of the target test vehicle is subjected to a range extender individual vibration and noise bench test, and a second target power generation curve of the range extender is determined according to the test data of the range extender individual vibration and noise bench test. In actual application, the range extender can be subjected to individual vibration and noise test on the bench, different working conditions (such as speed and load) are controlled, and vibration and noise levels generated by the range extender are measured by using special sensors and equipment. The test equipment usually includes an accelerometer, a sound level meter, etc., for accurately capturing vibration and noise data. NVH data is collected at each working point, wherein NVH includes Noise (noise), Vibration (vibration), and Harshness (sound vibration roughness). The collected NVH data is analyzed to find the NVH performance of each working point. On the basis of analyzing the NVH data, the power generation curve is adjusted to find working points that can provide reasonable power generation and maintain good NVH performance. These working points are connected to obtain the second target power generation curve.

[0121] In a preferred embodiment, the second target power generation curve of the range extender is determined by subjecting the range extender of the target test vehicle to the range extender individual vibration and noise bench test, comprising:

[0122] The second NVH data of the range extender of the target test vehicle at different throttle openings is obtained by subjecting the range extender of the target test vehicle to the range extender individual vibration and noise bench test.

[0123] The second target power generation curve of the range extender is determined according to the second NVH data.

[0124] Specifically, in this embodiment, in the range extender individual vibration and noise bench test, the range extender is installed on the test bench to simulate different working conditions in vehicle driving. By controlling the throttle opening, the output torque and speed of the range extender can be changed. During the test, accelerometers and sound level meters and other sensors can be used to record vibration and noise data of the range extender at different throttle openings in real time. These data are referred to as second NVH data.

[0125] Further, the obtained second NVH data is analyzed in detail to evaluate the NVH performance of the range extender at different throttle openings. In particular, attention is focused on those working points under high noise and high vibration conditions, because these points can significantly affect the NVH performance of the vehicle. Through data analysis, working points with good NVH performance while ensuring a certain power generation are found. These working points will serve as the basis for determining the second target power generation curve.

[0126] It should be noted that in the embodiment, in the process of determining the second target power generation curve, it is necessary to find the best balance between power generation capacity and NVH performance. That is, under the premise of ensuring the effective power generation of the range extender, the vibration and noise level is reduced as much as possible. This optimization process ensures that the power generation efficiency will not be significantly affected by improving the NVH performance. The final second target power generation curve is composed of those working points that have achieved the best balance between NVH performance and power generation capacity.

[0127] As Figure 2 shown is a schematic diagram of a range extender single-body vibration and noise bench test for determining a second target power generation curve provided by the present application, as Figure 2 shown, the abscissa is the speed, and the ordinate is the torque, Figure 2 The curves in the figure represent the vibration and noise, power consumption, and oil point conversion rate under different speeds and torques. Among them, line 1 represents the vibration and noise, line 2 represents the power, and line 3 represents the oil-electric conversion rate. By comprehensively considering the vibration and noise, power, and oil-electric conversion rate, the working points that have achieved the best balance between NVH performance and power generation capacity are determined. Connecting these working points obtains the second target power generation curve.

[0128] In a preferred embodiment, after determining the second target power generation curve of the range extender, the method further comprises:

[0129] obtaining a vehicle modal frequency planning table of the target test vehicle;

[0130] According to the vehicle modal frequency planning table, simulating and analyzing each working point in the second target power generation curve;

[0131] Based on the simulation and analysis results of each working point in the second target power generation curve, optimizing the second target power generation curve.

[0132] Specifically, in the embodiment, the vehicle modal frequency planning table of the target test vehicle is obtained. In actual application, the vehicle modal frequency planning table records in detail the vibration characteristics of each part of the vehicle at different frequencies, that is, the modal frequencies of each component of the vehicle. These modal frequencies are important factors affecting the overall NVH performance of the vehicle.

[0133] After determining the second target power generation curve, the vehicle modal frequency planning table is used to simulate and analyze each working point in the curve. Through simulation technology, the influence of the range extender on the vibration characteristics of the vehicle at different working points can be simulated, especially how to excite the modal frequency of the vehicle. This analysis helps to identify which working points may cause the vehicle to resonate at a specific frequency, thereby causing undesirable NVH phenomena such as noise and uncomfortable vibration.

[0134] Further, based on the results of these simulation analyses, the second target power generation curve is further optimized. The optimization goal is to adjust the operating point to avoid the frequency range that may cause resonance, or to reduce the power output in these frequency ranges as much as possible, so as to reduce the impact on the vehicle NVH performance.

[0135] As Figure 3 shown is a schematic diagram of the vehicle frequency planning table. As can be seen from the diagram, the area in the frame with a circular marker added is the data point affecting the NVH performance, which is the frequency avoidance point. In order to ensure that the NVH performance is not affected, it is necessary to delete these data points from the vehicle frequency planning table.

[0136] In a preferred embodiment, the present application provides a vehicle modal frequency planning process block diagram as Figure 4 shown, as Figure 4 shown:

[0137] S1: target test vehicle NVH performance test;

[0138] S2: obtain the vehicle modal frequency planning table: based on the NVH performance data of the target test vehicle, formulate the vehicle modal frequency planning table, wherein the vehicle modal frequency planning table records the modal vibration characteristics of the vehicle structure at different frequencies, and is an important reference for subsequent NVH performance design and optimization;

[0139] S3: body and other system structure design and simulation analysis: according to the vehicle modal frequency planning table, the structure design of the body and related systems is carried out, and computer aided engineering tools are applied for simulation analysis;

[0140] S4: meet the modal planning table: after the design is completed, it is checked whether the design meets the requirements of the integrated modal frequency planning table. If the design does not meet the requirements, the design parameters need to be adjusted and sensitivity analysis needs to be carried out to optimize the design scheme;

[0141] S5: if the design meets the modal planning table, the next step is to design other performances such as strength and crash safety. It needs to be noted that for these designs, the focus is on improving the overall vehicle performance while not introducing new NVH problems, in addition, it is also necessary to judge whether other performances are met, if not, the design scheme needs to be optimized;

[0142] S6: sample vehicle trial production and NVH performance test: after the design phase is completed, the sample vehicle is manufactured and the NVH performance test is carried out. If it is found that there are NVH problems, the scheme needs to be improved and the adjustment control of parts needs to be carried out to optimize the NVH performance of the vehicle;

[0143] S7: mass production: after all NVH problems are solved and all performance indicators meet the design requirements, the vehicle enters the mass production stage.

[0144] Step S103, determining a comprehensive target power generation curve of the range extender according to the first target power generation curve and the second target power generation curve;

[0145] Specifically, in this embodiment, the first target power generation curve is determined based on the single-body energy consumption bench test of the range extender. It mainly reflects the optimal power generation power output points of the range extender under different working conditions, aiming to improve fuel efficiency and electric energy conversion efficiency, while ensuring the power demand of the vehicle. The second target power generation curve is determined through the single-body vibration noise bench test of the range extender, focusing on reducing noise and vibration generated during vehicle operation to improve ride comfort. It considers the NVH performance of the range extender under different throttle openings and power outputs, and selects those working points with the best NVH performance.

[0146] The formulation of the comprehensive target power generation curve needs to combine the best working points in the first target power generation curve and the second target power generation curve. This process involves a comprehensive evaluation of different working points to ensure that the NVH performance is optimized without significantly sacrificing energy efficiency. In practical applications, when determining the comprehensive target power generation curve, multi-objective optimization is usually required. This optimization process balances the relationship between energy efficiency and NVH performance to ensure that the final working point selection can take into account both the economy and comfort of the vehicle. This optimization may use methods such as multivariate analysis, weight coefficient distribution, etc. to find the best balance point between multiple objectives. In addition, in order to ensure the actual application effect of the comprehensive target power generation curve, simulation analysis and actual vehicle testing are usually required for verification. Through simulation, the effects of different working points are predicted and optimized in advance; through actual testing, it is verified whether the performance of these working points under real working conditions meets the expectations.

[0147] Through the determination of the comprehensive target power generation curve, the range extender not only achieves optimization in energy efficiency, but also improves in NVH performance.

[0148] In a preferred embodiment, the determination of the comprehensive target power generation curve of the range extender according to the first target power generation curve and the second target power generation curve comprises:

[0149] According to the first target power generation curve and the second target power generation curve, the comprehensive target power generation curve of the range extender is determined to meet the fourth preset condition;

[0150] Wherein, the fourth preset condition is that the actual energy consumption is less than or equal to the preset energy consumption, and the actual NVH data is less than or equal to the preset NVH data.

[0151] As shown in Figure 5 The range extender bench test MAP provided by the embodiment of the present application, Figure 5In the figure, the abscissa represents the speed, the ordinate represents the torque, curve 1 in the figure represents the theoretical power generation curve, curve 2 represents the first actual power generation curve, curve 3 represents the second actual power generation curve, and curve 4 represents the second target power generation curve, and in addition, Figure 5 In the figure, the contour line represents the range extender thermal efficiency, and in actual application, the range extender thermal efficiency is converted by the range extender fuel consumption, and the higher the value, the higher the range extender thermal efficiency, that is, the higher the range extender oil-electric conversion rate.

[0152] Specifically, in this embodiment, first, the fourth preset condition needs to be set, that is, the fourth preset condition is that the actual energy consumption is less than or equal to the preset energy consumption, and the actual NVH data is less than or equal to the preset NVH data. On the basis of integrating the first target power generation curve and the second target power generation curve, the comprehensive target power generation curve is determined by setting the fourth preset condition. The fourth preset condition ensures that the range extender under the comprehensive target power generation curve not only can effectively control the fuel or electric energy consumption and realize high-efficiency operation, but also can meet the comfort standard in noise and vibration. In actual application, in order to ensure the actual feasibility of the comprehensive target power generation curve, it needs to be verified by actual vehicle test, and may be further adjusted and optimized until it meets the expected requirements.

[0153] Step S104, controlling the range extender of the target test vehicle to run at each initial working point on the comprehensive target power generation curve in turn, and recording the first NVH data of the range extender during the running process;

[0154] Specifically, in this embodiment, after obtaining the comprehensive target power generation curve, each initial working point on the comprehensive target power generation curve is determined, and the range extender is controlled to run at each initial working point on the comprehensive target power generation curve in turn, and the first NVH data of the range extender is recorded during the running process. The NVH data includes noise, vibration and sound vibration roughness and other indicators, which reflect the running characteristics of the range extender at different working points.

[0155] Step S105, determining a plurality of target working points of the range extender according to the first NVH data.

[0156] Specifically, according to the first NVH data obtained in step S104, the actual NVH performance of each initial working point is determined through analysis, and in this application, the noise level, vibration frequency, intensity and overall sound vibration roughness and other indicators are focused on.

[0157] Further, based on the NVH data, those initial working points with good performance in noise and vibration are screened out. These points not only meet the preset conditions of NVH, but also consider the balance of energy efficiency and power output, and the initial working points with good performance in noise and vibration and the balance of energy efficiency and power output are determined as target working points.

[0158] In a preferred embodiment, the operating parameters corresponding to each target operating point are obtained respectively;

[0159] According to the operating parameters corresponding to each target operating point, the oil-electric conversion rate corresponding to each target operating point is determined;

[0160] Each target operating point is assigned a corresponding weight according to the oil-electric conversion rate corresponding to each target operating point;

[0161] According to each target operating point and the weight corresponding to each target operating point, the comprehensive oil-electric conversion rate of the range extender is determined;

[0162] According to the comprehensive oil-electric conversion rate, the weight and / or operating parameter corresponding to each target operating point is adjusted.

[0163] Specifically, in this embodiment, first, the operating parameters corresponding to each target operating point are obtained respectively. These parameters include generator power, speed, engine output torque, fuel consumption, and power generation, etc. These data are the basis for analyzing the efficiency and performance of the range extender.

[0164] Based on the above operating parameters, the oil-electric conversion rate of each target operating point is calculated. The oil-electric conversion rate is a key indicator of the efficiency of the range extender in converting fuel into electrical energy. A higher conversion rate indicates higher energy efficiency and lower fuel consumption.

[0165] Further, the oil-electric conversion rate of each target operating point is assigned a corresponding weight. In practical applications, the allocation of weights is based on the importance and actual use frequency of the target operating point, or based on the different emphasis of the vehicle owner on energy efficiency and NVH performance.

[0166] Further, using the weighted average method, the comprehensive oil-electric conversion rate of the range extender is calculated according to each target operating point and the weight corresponding to each target operating point. This comprehensive conversion rate provides a global performance indicator, reflecting the average efficiency of the range extender under various operating conditions.

[0167] Further, based on the calculated comprehensive oil-electric conversion rate, the weight and / or operating parameter of each target operating point can be adjusted as needed. The purpose of adjustment is to optimize the overall energy efficiency and performance of the range extender, making it more in line with the use requirements of the vehicle.

[0168] As Figure 6A target working point oil-electric conversion rate weight assignment diagram is provided for the embodiment. The left chart in the diagram shows the operating parameters and oil-electric conversion rates corresponding to each target working point, and the fuel consumption and power generation are not shown in the chart. The right chart shows the target working points with higher oil-electric conversion rates selected from all target working points, and different weights are assigned according to needs. As can be seen from the right chart, the comprehensive oil-electric conversion rate is 3.2 after weighted averaging according to the current weight assignment and the corresponding oil-electric conversion rates.

[0169] In a preferred embodiment, the adjusting of the weight and / or operating parameter corresponding to each target working point according to the comprehensive oil-electric conversion rate comprises:

[0170] determining whether the comprehensive oil-electric conversion rate is greater than or equal to a preset oil-electric conversion rate threshold value;

[0171] if the comprehensive oil-electric conversion rate is greater than or equal to the preset oil-electric conversion rate threshold value, retaining the plurality of target working points;

[0172] if the comprehensive oil-electric conversion rate is less than the preset oil-electric conversion rate threshold value, adjusting the weight and / or operating parameter corresponding to at least one target working point of the plurality of target working points so that the comprehensive oil-electric conversion rate is greater than or equal to the preset oil-electric conversion rate threshold value.

[0173] Specifically, in the embodiment, first, it is determined whether the calculated comprehensive oil-electric conversion rate is greater than or equal to a preset oil-electric conversion rate threshold value. The threshold value is a performance standard set by the range extender during the design and testing phase, which is used to ensure that the energy efficiency of the range extender reaches the expected target.

[0174] If the comprehensive oil-electric conversion rate is greater than or equal to the preset threshold value, it means that the overall performance of the range extender has met the requirements. In this case, the weights and operating parameters of the plurality of target working points are retained without further adjustment. This means that the current parameter settings are sufficient for optimization and do not need to be modified.

[0175] If the comprehensive oil-electric conversion rate is less than the preset threshold value, it means that the energy efficiency of the range extender does not meet the expectations. In this case, the weight and / or operating parameter of at least one target working point of the plurality of target working points needs to be adjusted.

[0176] The adjustment can be increasing the weight of some high-efficiency working points, reducing the weight of low-efficiency working points, or directly adjusting the operating parameters of the working points, such as speed, power output, etc. The goal of these adjustments is to improve the overall oil-electric conversion rate so that it reaches or exceeds the preset threshold value.

[0177] In this embodiment, by setting a threshold for oil-electric conversion efficiency, the target standard for the efficiency optimization of the range extender is determined. In the optimization process, by retaining or adjusting the weight and parameters of the working points, the overall performance of the range extender is ensured to meet the standard. This method not only ensures the high efficiency of the vehicle under various operating conditions, but also optimizes the fuel economy and electric energy utilization, thereby improving the overall market competitiveness of the vehicle. In addition, by refining and adjusting the weight and operating parameters of each working point, the performance output of the range extender can be more precisely controlled, making it better adapt to the actual use environment and requirements.

[0178] In a preferred embodiment, the target working points that make the overall oil-electric conversion efficiency greater than or equal to the preset oil-electric conversion efficiency threshold are applied to a plurality of mass-produced vehicles for real vehicle testing;

[0179] The plurality of mass-produced vehicles are controlled to operate at the plurality of target working points, and third NVH data of each mass-produced vehicle operating at each working point is recorded;

[0180] The third NVH data of the plurality of mass-produced vehicles is analyzed, and the weight and / or operating parameters corresponding to at least one of the target working points are adjusted according to the analysis results.

[0181] Specifically, in this embodiment, the target working points obtained through preliminary experiments and simulation optimization are applied to a plurality of mass-produced vehicles, which are controlled to operate according to the set target working points under actual road conditions. During the operation of the mass-produced vehicles, the third NVH data of each mass-produced vehicle operating at each working point is recorded, and the collected third NVH data is analyzed in detail. According to the analysis results, the weight and / or operating parameters corresponding to at least one of the target working points are adjusted. The purpose of adjustment is to further optimize the performance of the range extender, so that it better meets the energy efficiency and NVH performance requirements in actual use.

[0182] In a preferred embodiment, the present application exemplarily proposes a range extender sweep working strategy, i.e. through real vehicle testing, the vibration or noise experienced by the vehicle occupants under different working conditions is tested, and the target working points are further optimized according to the test results.

[0183] Example one: driver's right ear noise test under different idle speeds, the test results are shown in Figure 7 , combined with Figure 7 the sound pressure level chart of the driver's right ear position under different power and speed on the left side and the change curve on the right side, it can be seen that as the power of the range extender increases, the noise of the driver's right ear shows an increasing trend; the noise of the driver's right ear shows a relatively poor performance when the speed of the range extender is 1050-1150 rpm, and the noise performance is relatively good within 1000 rpm.

[0184] Example two: right ear noise test of the middle row right passenger at different idle speeds, the test results are shown in Figure 8 , combined with Figure 8 the left side sound pressure level chart of the middle row right passenger at different power and speed and the right side change curve, it can be known that the right ear noise of the middle row right passenger shows an increasing trend as the power of the range extender increases; the right ear noise of the middle row right passenger shows relatively large deviation at the range extender speed of 1050-1150 rpm and 1350-1500 rpm, and shows relatively good performance within 1000 rpm.

[0185] Example three: right ear noise test of the rear row right passenger at different idle speeds, the test results are shown in Figure 9 , combined with Figure 9 the left side sound pressure level chart of the rear row right passenger at different power and speed and the right side change curve, it can be known that the right ear noise of the rear row right passenger shows an increasing trend as the power of the range extender increases; the right ear noise of the rear row right passenger shows relatively large deviation at the range extender speed of 1050-1200 rpm and 1400-1450 rpm, and shows relatively good performance within 1000 rpm.

[0186] Example four: steering wheel vibration test under different charging power, the test results are shown in Figure 10 , combined with Figure 10 the left side vibration chart of the steering wheel at different charging power and speed and the right side change curve, it can be known that the steering wheel vibration shows an increasing trend as the power of the range extender increases; the steering wheel vibration shows the largest at the range extender speed of 1150 rpm and 1250 rpm, and shows good performance within 1050 rpm.

[0187] Example five: seat rail vibration test under different charging power, the test results are shown in Figure 11 , combined with Figure 11 the left side vibration chart of the seat rail at different charging power and speed and the right side change curve, it can be known that the seat rail vibration is small within the whole charging speed and charging power range; the seat rail vibration shows relatively large deviation at the range extender speed of 1100-1150 rpm and 1400-1500 rpm.

[0188] Example six: in-vehicle noise test under driving state, the test results are shown in Figure 12 , combined with Figure 12 the left side in-vehicle noise chart at different power and speed and the right side change curve, it can be known that the in-vehicle noise shows linear increase, and is basically better than the previous range extender working strategy state.

[0189] Example seven: seat rail vibration test under fuel supplement power supply condition, the test results are shown in the following table 1 and table 2, wherein table 1 is the original state of the vehicle fuel supplement power supply condition NVH performance; Table 2 is the fuel supplement power supply condition NVH performance based on the target working point operation.

[0190]

[0191] Table 1

[0192]

[0193]

[0194] Table 2

[0195] Example eight: steering wheel vibration test under driving state, the test results are shown in Figure 13 , combined with Figure 13 the left steering wheel vibration chart under different power and speed and the right change curve, it can be seen that the steering wheel vibration increases obviously under the condition that the range extender speed is 1250rpm.

[0196] Example nine: seat rail vibration test under driving state, the test results are shown in Figure 14 , combined with Figure 14 the left seat rail vibration chart under different power and speed and the right change curve, it can be seen that the seat rail vibration is relatively low, and there is no NVH problem.

[0197] According to the above test results, the test conclusion is obtained: with the increase of the power generation of the range extender, the noise and vibration in the vehicle as a whole show an increasing trend; the noise at the right ear of the driver shows a relatively large deviation at the range extender speed of 1050-1150rpm, and the noise performance is relatively good within 1000rpm; the noise at the right ear of the middle row shows a relatively large deviation at the range extender speed of 1050-1150rpm and 1400-1450rpm, and the noise performance is relatively good within 1000rpm; the noise at the right ear of the rear row shows a relatively large deviation at the range extender speed of 1050-1200rpm and 1400-1450rpm, and the noise performance is relatively good within 1000rpm; the steering wheel vibration shows the largest at the range extender speed of 1150rpm and 1250rpm, and the steering wheel vibration is better within 1050rpm; within the whole charging speed and charging power range, the vibration rail vibration is relatively small, and the seat rail vibration shows a relatively large deviation at the range extender speed of 1100-1150rpm and 1400-1500rpm.

[0198] Based on the above test conclusion, the suggestions given by the embodiment are as follows:

[0199] Idle speed increaser speed and power suggestion: 1000 rpm (0 kW);

[0200] Driving state: Remove the 1250 rpm (8 kW) target working point of the range extender 1250, and use the next level 1300 rpm (10 kW); Generator stop speed is increased from 15 km / h to 25 km / h;

[0201] Fuel supplementing power condition: The low gear of fuel supplementing power is changed from the target working point 1050 rpm (5 kW) to the target working point 950 rpm (5 kW); The middle gear is changed from the target working point 1350 rpm (10 kW) to the target working point 1500 rpm (10 kW). It should be noted that the above examples are only part of the examples shown by the present application for the convenience of understanding, and are not all examples protected by the present application.

[0202] The present application provides a method for determining the working point of an automobile range extender, comprising: determining a first target power generation curve of a range extender of a target test vehicle through a range extender single-body energy consumption bench test on the range extender of the target test vehicle; determining a second target power generation curve of the range extender through a range extender single-body vibration noise bench test on the range extender of the target test vehicle; determining a comprehensive target power generation curve of the range extender according to the first target power generation curve and the second target power generation curve; controlling the range extender of the target test vehicle to run in turn at each initial working point on the comprehensive target power generation curve, and recording first NVH data of the range extender during the running process; and determining a plurality of target working points of the range extender according to the first NVH data. The present application combines the first target power generation curve obtained through the single-body energy consumption bench test with the second target power generation curve obtained through the single-body vibration noise bench test to determine the comprehensive target power generation curve, controls the range extender to run through the initial working points corresponding to the comprehensive target power generation curve to obtain the first NVH data, and finally determines the target working points of the range extender according to the first NVH data. When determining the target working points of the range extender, the present application not only considers the influence of energy consumption, but also considers the influence of NVH data, so that the determined target working points not only meet the energy consumption economy requirements of the whole vehicle, but also meet the NVH performance requirements of the whole vehicle, thereby improving the satisfaction of users.

[0203] Based on the same inventive concept, the second aspect of the embodiments of the present application provides a system for determining the working point of an automobile range extender, as shown in Figure 15 The system comprises:

[0204] A first determining module 201 is configured to determine a first target power generation curve of a range extender of a target test vehicle through a range extender single-body energy consumption bench test on the range extender of the target test vehicle;

[0205] The second determining module 202 is configured to determine a second target power generation curve of the range extender by performing a range extender single-body vibration noise bench test on the range extender of the target test vehicle.

[0206] The third determining module 203 is configured to determine a comprehensive target power generation curve of the range extender according to the first target power generation curve and the second target power generation curve.

[0207] The control module 204 is configured to control the range extender of the target test vehicle to operate at each initial working point on the comprehensive target power generation curve in sequence, and record first NVH data of the range extender during the operation.

[0208] The fourth determining module 205 is configured to determine a plurality of target working points of the range extender according to the first NVH data.

[0209] Optionally, the system further comprises:

[0210] The first obtaining sub-module is configured to obtain respective operating parameters corresponding to each of the target working points.

[0211] The first determining sub-module is configured to determine respective oil-electric conversion rates corresponding to each of the target working points according to the respective operating parameters corresponding to each of the target working points.

[0212] The assigning sub-module is configured to assign respective weights to the respective oil-electric conversion rates corresponding to each of the target working points.

[0213] The second determining sub-module is configured to determine a comprehensive oil-electric conversion rate of the range extender according to each of the target working points and the respective weights corresponding to each of the target working points.

[0214] The first adjusting sub-module is configured to adjust the respective weights and / or operating parameters corresponding to each of the target working points according to the comprehensive oil-electric conversion rate.

[0215] Optionally, the first adjusting sub-module comprises:

[0216] The judging sub-unit is configured to judge whether the comprehensive oil-electric conversion rate is greater than or equal to a preset oil-electric conversion rate threshold.

[0217] The retaining sub-unit is configured to retain the plurality of target working points if the comprehensive oil-electric conversion rate is greater than or equal to the preset oil-electric conversion rate threshold.

[0218] The adjusting subunit is configured to adjust a weight and / or an operating parameter corresponding to at least one of the target working points, if the comprehensive oil-electric conversion rate is less than the preset oil-electric conversion rate threshold, so that the comprehensive oil-electric conversion rate is greater than or equal to the preset oil-electric conversion rate threshold.

[0219] Optionally, the second target power generation curve of the range extender is determined by performing the range extender single-body vibration noise bench test on the range extender of the target test vehicle, and the second determining module 202 includes:

[0220] The second acquisition sub-module is configured to acquire second NVH data of the range extender of the target test vehicle under different throttle openings by performing the range extender single-body vibration noise bench test on the range extender of the target test vehicle.

[0221] The third determining sub-module is configured to determine the second target power generation curve of the range extender according to the second NVH data.

[0222] Optionally, after the second target power generation curve of the range extender is determined, the system further includes:

[0223] The third acquisition sub-module is configured to acquire a vehicle modal frequency planning table of the target test vehicle.

[0224] The simulation analysis sub-module is configured to perform simulation analysis on each working point in the second target power generation curve according to the vehicle modal frequency planning table.

[0225] The optimization sub-module is configured to optimize the second target power generation curve based on the simulation analysis results of each working point in the second target power generation curve.

[0226] Optionally, the first target power generation curve of the range extender of the target test vehicle is determined by performing the range extender single-body energy consumption bench test on the range extender of the target test vehicle, and the first determining module 201 includes:

[0227] The fourth determining sub-module is configured to determine a universal characteristic curve of the range extender by performing the range extender single-body energy consumption bench test on the range extender of the target test vehicle, the universal characteristic curve being a collection of a speed curve, a power curve and a torque curve.

[0228] The fifth determining sub-module is configured to analyze the universal characteristic curve to determine a plurality of working points in the universal characteristic curve that meet a first preset condition.

[0229] The sixth determining sub-module is configured to determine a theoretical power generation curve of the range extender according to the plurality of working points that meet the first preset condition.

[0230] a seventh determining sub-module, configured to determine a first actual power generation curve according to the theoretical power generation curve, and to determine a second actual power generation curve according to the theoretical power generation curve, the first actual power generation curve being determined according to a second preset condition, and the second actual power generation curve being determined according to a third preset condition;

[0231] an eighth determining sub-module, configured to determine the first target power generation curve according to the first actual power generation curve and the second actual power generation curve, the first target power generation curve being determined according to the third preset condition;

[0232] wherein the first preset condition is that the theoretical rotating speed is greater than or equal to a first preset rotating speed, the theoretical torque is greater than or equal to a first preset torque, and the theoretical power is greater than or equal to a first preset power, the second preset condition is that the actual power is greater than or equal to a second preset power, and the actual torque is greater than or equal to a second preset torque, and the third preset condition is that the actual battery power is greater than or equal to a preset battery power.

[0233] Optionally, the third determining module 203 includes:

[0234] a ninth determining sub-module, configured to determine a comprehensive target power generation curve of the range extender according to the first target power generation curve and the second target power generation curve, the comprehensive target power generation curve being determined according to a fourth preset condition.

[0235] wherein the fourth preset condition is that the actual energy consumption is less than or equal to a preset energy consumption, and the actual NVH data is less than or equal to a preset NVH data.

[0236] Optionally, the system further includes:

[0237] a testing sub-module, configured to apply a plurality of target working points corresponding to the comprehensive fuel-electric conversion rate greater than or equal to the preset fuel-electric conversion rate threshold to a plurality of mass-produced vehicles for real vehicle testing.

[0238] a control sub-module, configured to control the plurality of mass-produced vehicles to run at the plurality of target working points respectively, and to record third NVH data of each of the mass-produced vehicles when running at each working point respectively.

[0239] a second adjusting sub-module, configured to analyze the third NVH data of the plurality of mass-produced vehicles, and to adjust a weight and / or a running parameter corresponding to at least one of the target working points according to an analysis result.

[0240] Based on the same inventive concept, a third aspect of the embodiments of the present application provides a vehicle, including:

[0241] one or more processors; and

[0242] One or more computer-readable media storing instructions that, when executed by the one or more processors, cause the vehicle to perform the method for determining operating points of a range extender of an automobile according to the first aspect of the application.

[0243] Each embodiment in the specification focuses on the difference from other embodiments, and the same or similar parts between various embodiments can be referred to each other.

[0244] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, device or computer program product. Therefore, the embodiments of the present application can be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present application can be in the form of a computer program product implemented 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.

[0245] The embodiments of the present application are described with reference to flowcharts and / or block diagrams according to the method, terminal device (system) and computer program product of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be realized by computer program instructions. These computer program instructions can be provided to a general purpose computer, a special purpose computer, an embedded processor or other programmable data processing terminal device to produce a machine, so that the instructions executed by the computer or other programmable data processing terminal device produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks Figure 1 The functions specified in one or more flows and / or blocks

[0246] These computer program instructions can also be stored in a computer readable storage medium that can guide the computer or other programmable data processing terminal device to work in a specific way, so that the instructions stored in the computer readable storage medium produce a product including instruction devices that implement the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks Figure 1 The functions specified in one or more flows and / or blocks

[0247] These computer program instructions can also be loaded into a computer or other programmable data processing terminal device, so that a series of operation steps are performed on the computer or other programmable terminal device to produce a computer implemented process, so that the instructions executed on the computer or other programmable terminal device provide steps for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks Figure 1 The functions specified in one or more flows and / or blocks

[0248] Although preferred embodiments of the application have been described in detail, those skilled in the art will appreciate that various modifications and alterations can be made to the embodiments without departing from the scope of the application. Accordingly, the application is intended to embrace all such alterations and modifications as fall within the scope of the application. There are many variations to which the application is applicable. For example, the above embodiments can be implemented in hardware or software, or a combination of both hardware and software. Furthermore, the above embodiments can be implemented in one computer system or distributed among a plurality of computer systems. Accordingly, other embodiments are within the scope of the following claims.

[0249] Finally, it should be noted that the terms "first", "second", and the like, herein do not denote any order, quantity, combination, or importance, but rather are used to distinguish one element from another, and do not imply singular or plural. Moreover, the term "include", "have", or "contain" or any other variant thereof, are intended to encompass non-exclusive inclusion, such that processes, methods, articles, or apparatuses that comprise a set of elements not expressly listed are also within the scope of the following claims. In the absence of further limitations, an element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the stated element.

[0250] The above provides a method for determining a working point of an automobile range extender, a system and a vehicle. The principles and implementation modes of the application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the application and its core idea. For those skilled in the art, according to the idea of the application, the specific implementation modes and application ranges can be changed. In summary, the content of the specification should not be understood as a limitation of the application.

Claims

1. A method for determining the operating point of an automobile range extender, characterized in that: The method comprises: Determining a first target power generation curve of the range extender of the target test vehicle by performing a range extender unit energy consumption bench test on the range extender of the target test vehicle; determining a second target power generation curve of the range extender by performing a range extender unit vibration and noise bench test on the range extender of the target test vehicle; determining a comprehensive target power generation curve for the range extender based on the first target power generation curve and the second target power generation curve; controlling the range extender of the target test vehicle to operate at each initial operating point on the comprehensive target power generation curve in sequence, and recording first NVH data of the range extender during the operation; A plurality of target operating points of the range extender are determined based on the first NVH data.

2. The method for determining the operating point of an automobile range extender according to claim 1, characterized in that: After determining a plurality of target operating points of the range extender, the method further includes: respectively obtaining the operating parameters corresponding to each of the target operating points; Determining the oil-to-electricity conversion rate corresponding to each target operating point according to the operating parameters corresponding to each target operating point; Assigning corresponding weights to the oil-to-electricity conversion rates corresponding to each target operating point; determining a comprehensive oil-to-electricity conversion rate of the range extender according to each of the target operating points and the weight corresponding to each of the target operating points; According to the comprehensive oil-to-electricity conversion rate, the weights and / or operating parameters corresponding to the respective target operating points are adjusted.

3. The method for determining the operating point of an automobile range extender according to claim 2, characterized in that: The adjusting of the weights and / or operating parameters corresponding to the respective target operating points according to the comprehensive oil-to-electricity conversion rate includes: Determining whether the comprehensive oil-to-electricity conversion rate is greater than or equal to a preset oil-to-electricity conversion rate threshold; If the comprehensive oil-to-electricity conversion rate is greater than or equal to the preset oil-to-electricity conversion rate threshold, retaining the plurality of target operating points; If the comprehensive oil-to-electricity conversion rate is less than the preset oil-to-electricity conversion rate threshold, the weight and / or operating parameters corresponding to at least one target operating point among the multiple target operating points are adjusted so that the comprehensive oil-to-electricity conversion rate is greater than or equal to the preset oil-to-electricity conversion rate threshold.

4. The method for determining the operating point of an automobile range extender according to claim 1, characterized in that: The determining of the second target power generation curve of the range extender by performing the range extender single unit vibration and noise bench test on the range extender of the target test vehicle includes: Performing a range extender single unit vibration and noise bench test on the range extender of the target test vehicle to obtain second NVH data of the range extender of the target test vehicle at different throttle openings; A second target power generation curve of the range extender is determined based on the second NVH data.

5. A method for determining the operating point of an automobile range extender according to claim 1 or 4, characterized in that: After determining the second target power generation curve of the range extender, the method further includes: Obtaining a vehicle modal frequency planning table for the target test vehicle; performing simulation analysis on each operating point in the second target power generation curve according to the vehicle modal frequency planning table; Based on simulation analysis results of each operating point in the second target power generation curve, the second target power generation curve is optimized.

6. The method for determining the operating point of an automobile range extender according to claim 1, characterized in that: The determining of a first target power generation curve of the range extender of the target test vehicle by performing a range extender unit energy consumption bench test on the range extender of the target test vehicle includes: Determining a universal characteristic curve of the range extender by performing the range extender single unit energy consumption bench test on the range extender of the target test vehicle, wherein the universal characteristic curve is a combination of a speed curve, a power curve, and a torque curve; Analyzing the universal characteristic curve to determine a plurality of operating points in the universal characteristic curve that meet a first preset condition; determining a theoretical power generation curve of the range extender according to the plurality of operating points that satisfy the first preset condition; Determining a first actual power generation curve based on the theoretical power generation curve with the goal of satisfying a second preset condition, and determining a second actual power generation curve with the goal of satisfying a third preset condition; determining the first target power generation curve based on the first actual power generation curve and the second actual power generation curve with the goal of satisfying a third preset condition; Among them, the first preset condition is that the theoretical speed is greater than or equal to the first preset speed, and the theoretical torque is greater than or equal to the first preset torque and the theoretical power is greater than or equal to the first preset power; the second preset condition is that the actual power is greater than or equal to the second preset power, and the actual torque is greater than or equal to the second preset torque; the third preset condition is that the actual battery power is greater than or equal to the preset battery power.

7. The method for determining the operating point of an automobile range extender according to claim 6, characterized in that: The determining, based on the first target power generation curve and the second target power generation curve, of the range extender includes: determining a comprehensive target power generation curve for the range extender based on the first target power generation curve and the second target power generation curve with the goal of satisfying a fourth preset condition; Among them, the fourth preset condition is that the actual energy consumption is less than or equal to the preset energy consumption, and the actual NVH data is less than or equal to the preset NVH data.

8. The method for determining the operating point of an automobile range extender according to claim 3, characterized in that: The method further comprises: Applying the target operating points corresponding to the comprehensive oil-to-electricity conversion rate being greater than or equal to the preset oil-to-electricity conversion rate threshold to multiple mass-produced vehicles for actual vehicle testing; controlling the plurality of mass-produced vehicles to respectively operate at the plurality of target operating points, and respectively recording the third NVH data of each mass-produced vehicle when operating at each operating point; The third NVH data of the plurality of mass-produced vehicles are analyzed, and the weight and / or operating parameters corresponding to at least one target operating point among the plurality of target operating points are adjusted according to the analysis result.

9. A system for determining the operating point of an automobile range extender, characterized in that: The system comprises: a first determining module, configured to determine a first target power generation curve of the range extender of a target test vehicle by performing a range extender unit energy consumption bench test on the range extender of the target test vehicle; a second determining module, configured to determine a second target power generation curve of the range extender by performing a range extender unit vibration and noise bench test on the range extender of the target test vehicle; a third determining module, configured to determine a comprehensive target power generation curve of the range extender based on the first target power generation curve and the second target power generation curve; a control module, configured to control the range extender of the target test vehicle to operate at each initial operating point on the comprehensive target power generation curve in sequence, and to record first NVH data of the range extender during the operation; A fourth determination module is configured to determine a plurality of target operating points of the range extender based on the first NVH data.

10. A vehicle, characterized in that: include: one or more processors; and One or more computer-readable media having instructions stored thereon, when executed by the one or more processors, cause the vehicle to execute the method for determining the operating point of the vehicle range extender according to any one of claims 1 to 8.

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