Range extender working point selecting and switching method and device, equipment and medium

Abstract

The embodiment of the invention discloses a range extender working point selecting and switching method, device and equipment and a medium, and the selecting and switching method comprises the steps that driving demand information and running state information of a vehicle are obtained firstly, then the target power demand of a range extender is determined according to the driving demand information and the running state information, and the target power demand of the range extender is determined according to the target power demand. Then constructing a working performance optimization function of the range extender; wherein the working performance optimization function comprises at least one to-be-optimized parameter of oil consumption, emission and vibration, and finally selecting a target working point of the range extender according to the target power demand and the working performance optimization function. Wherein the target working point corresponds to the target rotating speed and the target torque of the range extender. By means of the method, the working performance requirements of low oil consumption (high oil-electricity conversion efficiency or high system efficiency), low emission, low vibration and the like are met at the same time, so that the optimal working point and working curve of the range extender can be rapidly and accurately matched, and the effect of selecting and optimizing the working point of the range extender is achieved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of new energy vehicles, and in particular to a method, device, equipment and medium for selecting and switching a range extender operating point. Background Art

[0002] Range-extended electric vehicles are a technology that has received increasing attention in the commercial and passenger vehicle fields in recent years. They solve the pain points of pure electric vehicles, such as short driving range, long charging time, incomplete charging facilities, and high purchase costs, and have good development prospects. Among them, the range extender is a key component of the range-extended electric vehicle. The range extender can provide additional power, thereby increasing the mileage of the range-extended electric vehicle, and the working performance of the range extender, such as fuel consumption, emissions, and vibration, will have the most direct and important impact on the performance of the entire vehicle.

[0003] However, the existing technology cannot take into account the requirements of working performance such as fuel consumption, emissions, vibration, etc. in the selection and optimization of the working point of the range extender, and the calibration test workload of the range extender is very large, which cannot achieve the purpose of excellent comprehensive performance of the whole vehicle and has certain limitations. Summary of the invention

[0004] The embodiments of the present invention provide a method, device, equipment and medium for selecting and switching the working point of a range extender, and rationally construct a working performance optimization function of the range extender, which can simultaneously take into account the working performance requirements of low fuel consumption, low emissions, low vibration, etc., and quickly and accurately match the optimal working point and working curve of the range extender.

[0005] In a first aspect, an embodiment of the present invention provides a method for selecting and switching a range extender operating point, comprising:

[0006] Obtain driving demand information and operating status information of the vehicle;

[0007] determining a target power requirement of a range extender according to the driving requirement information and the operating state information;

[0008] Constructing a working performance optimization function of the range extender; wherein the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration;

[0009] According to the target power demand and the working performance optimization function, a target operating point of the range extender is selected; wherein the target operating point corresponds to a target speed and a target torque of the range extender.

[0010] In a second aspect, an embodiment of the present invention further provides a device for selecting and switching a range extender operating point, comprising:

[0011] An information acquisition module, used to acquire driving demand information and operating status information of the vehicle;

[0012] a power determination module, configured to determine a target power requirement of the range extender according to the driving requirement information and the operating state information;

[0013] A function construction module, used to construct a working performance optimization function of the range extender; wherein the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration;

[0014] The operating point selection module is used to select the target operating point of the range extender according to the target power demand and the working performance optimization function; wherein the target operating point corresponds to the target speed and target torque of the range extender.

[0015] In a third aspect, an embodiment of the present invention further provides a terminal device, including:

[0016] one or more processors;

[0017] A storage device for storing one or more programs;

[0018] When the one or more programs are executed by the one or more processors, the one or more processors implement the method for selecting and switching the operating point of the range extender as described in any one of the first aspects.

[0019] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for selecting and switching the operating point of a range extender as described in any one of the first aspects.

[0020] An embodiment of the present invention provides a method, device, equipment and medium for selecting and switching a working point of a range extender. The selection and switching method first obtains driving demand information and operating status information of a vehicle, then determines a target power demand of the range extender based on the driving demand information and the operating status information, and then constructs a working performance optimization function of the range extender; wherein the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emissions and vibrations, and finally selects a target working point of the range extender based on the target power demand and the working performance optimization function; wherein the target working point corresponds to a target speed and a target torque of the range extender. By using the above method, a working performance optimization function of the range extender is reasonably constructed, and the target speed and target torque corresponding to the optimal value of the working performance optimization function are found under the limitation of the target power demand, so as to determine the target working point of the range extender. The working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration, and can take into account the working performance requirements of low fuel consumption (high oil-to-electricity conversion efficiency or high system efficiency), low emission, low vibration, etc., so as to quickly and accurately match the optimal working point and working curve of the range extender, realize the selection and optimization of the working point of the range extender, which is conducive to ensuring the best working performance of the range extender and extending the service life of the range extender. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of a method for selecting and switching a range extender operating point provided by an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of an extended-range electric vehicle provided by an embodiment of the present invention;

[0023] Figure 3 It is a flow chart of another method for selecting and switching the working point of a range extender provided by an embodiment of the present invention;

[0024] Figure 4 It is a flowchart of another method for selecting and switching the working point of a range extender provided by an embodiment of the present invention;

[0025] Figure 5 It is a universal characteristic diagram of an optimal fuel consumption working curve and an equal power curve fitting provided by an embodiment of the present invention;

[0026] Figure 6 It is a universal characteristic diagram of an optimal emission working curve and an equal power curve fitting provided by an embodiment of the present invention;

[0027] Figure 7 It is a universal characteristic diagram of an optimal vibration working curve and an equal power curve fitting provided by an embodiment of the present invention;

[0028] Figure 8It is a universal characteristic diagram of an optimal comprehensive working curve and an equal power curve fitting provided by an embodiment of the present invention;

[0029] Fig. 9 It is a flowchart of another method for selecting and switching the working point of a range extender provided by an embodiment of the present invention;

[0030] Fig.10 It is a flowchart of another method for selecting and switching the working point of a range extender provided by an embodiment of the present invention;

[0031] Fig.11 It is a structural schematic diagram of a device for selecting and switching a range extender operating point provided by an embodiment of the present invention;

[0032] Fig.12 It is a structural diagram of a terminal device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] Figure 1 The present invention provides a flow chart of a method for selecting and switching a range extender operating point, which can be applied to the regulation of the operating performance of the range extender during the driving of the range extender electric vehicle. The method can be performed by a device for selecting and switching a range extender operating point, which can be implemented in the form of hardware and / or software, and can be configured in a control panel. Figure 1 As shown, the selection and switching method includes:

[0035] S110: Acquire driving demand information and operating status information of the vehicle.

[0036] Specifically, Figure 2 is a schematic diagram of the structure of an extended-range electric vehicle provided by an embodiment of the present invention, such as Figure 2As shown, the extended-range electric vehicle includes a vehicle controller VCU, a power battery module 10, a range extender module 20, a drive module 30 and an action module 40. Among them, the power battery module 10 includes an electrically connected battery management controller BMS and a power battery 11, and the battery management controller BMS is electrically connected to the vehicle controller VCU. The range extender module 20 includes an engine controller ECU, an engine 21, a generator controller GCU1 and a generator 22. The engine controller ECU is electrically connected to the engine 21 and the vehicle controller VCU respectively, and the generator controller GCU1 is electrically connected to the generator 22 and the vehicle controller VCU respectively. There may also be mechanically connected components between the engine 21 and the generator 22. The drive module 30 includes an electrically connected drive motor controller GCU2 and a drive motor 31, and the drive motor controller GCU2 is electrically connected to the vehicle controller VCU, the power battery 11, and the generator controller GCU1 respectively. The action module 40 includes a mechanically connected transmission unit 41 and a wheel 42, and there may also be mechanically connected components between the transmission unit 41 and the drive motor 31. It is understandable that in the extended-range electric vehicle, the range extender module 20 is only used for power generation and does not directly participate in driving. Due to the presence of the power battery 11, the output power of the range extender module 20 is decoupled from the target power of the whole vehicle, that is, the output power of the range extender module 20 has no direct relationship with the target power of the whole vehicle, but is related to its own working point. In other words, by selecting a suitable working point for the range extender module 20, the range extender module 20 can operate under the required low fuel consumption (high oil-to-electricity conversion efficiency or high system efficiency), low emissions, low vibration and other working performance.

[0037] Acquire the driving demand information and running status information of the vehicle. For example, the driving demand information may include the accelerator pedal opening change information, the brake pedal opening change information, the brake handle gear change information, etc. In this way, the position change of the accelerator pedal, the brake pedal, or the brake handle can be detected in real time through the vehicle sensor. For example, the running status information may include vehicle speed information, power battery remaining power information, vehicle fault information, etc. In this way, the specific value and change rate of the vehicle speed can be detected in real time through the vehicle sensor, the power usage and remaining power of the power battery 11 can be detected in real time through the vehicle sensor, and the various components of the vehicle can be detected in real time through the vehicle sensor. Whether there are faults or abnormalities, etc. Afterwards, the vehicle controller VCU can analyze the vehicle status according to the vehicle control strategy, as well as the driving demand information and running status information obtained, so as to determine the power required to be provided by the power battery module 10 and the power required to be provided by the range extender module 20 in the future. Exemplarily, the range extender module 20 can provide power to the power battery module 10 to charge the power battery module 10 , or the range extender module 20 can also directly provide power to the drive module 30 to drive the vehicle through the drive module 30 .

[0038] S120: Determine a target power requirement of the range extender according to the driving demand information and the operating status information.

[0039] Specifically, continue to refer to Figure 2 It can be understood that the vehicle controller VCU can determine the target power demand of the vehicle according to the vehicle control strategy, as well as the acquired driving demand information and operating status information. For example, the vehicle controller VCU can determine the target power demand corresponding to the normal driving of the vehicle according to the vehicle driving state of the vehicle, or the vehicle controller VCU can determine the target power demand corresponding to the normal braking of the vehicle according to the vehicle braking state of the vehicle. Afterwards, the vehicle controller VCU can also allocate the target power demand of the vehicle according to the working performance of the range extender module 20 and the power information of the power battery module 10 to determine the target power demand of the range extender module 20, that is, the power required to be provided by the range extender module 20, and determine the target power demand of the power battery module 10, that is, the power required to be provided by the power battery module 10.

[0040] S130. Constructing a working performance optimization function of the range extender; wherein the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration.

[0041] Specifically, continue to refer to Figure 2It should be noted that, in this embodiment, the range extender module 20 is regarded as a whole, and the range extender module 20 has the same meaning as the range extender discussed later. This embodiment does not involve the power demand allocation of the engine 21 and the generator 22 inside the range extender module 20. And, after determining the target power demand of the range extender, since the range extender has its freedom in selecting the working point, that is, for the same target power demand, the range extender can select different speed-torque working points, at this time, it is unknown which of the corresponding multiple speed-torque working points corresponds to the better working performance of the range extender. Therefore, in this embodiment, by constructing the working performance optimization function of the range extender, at least one parameter to be optimized among fuel consumption, emission and vibration is combined, so that the range extender can meet the requirements of working performance such as low fuel consumption (high oil-to-electricity conversion efficiency or high system efficiency), low emission, and low vibration according to the value of the working performance optimization function. Exemplarily, after constructing the working performance optimization function of the range extender, the range extender can meet the working performance requirements by obtaining the extreme value of the working performance optimization function and the corresponding parameters to be optimized. Exemplarily, when the parameter to be optimized includes fuel consumption, the range extender can meet the requirements of low fuel consumption (high oil-to-electricity conversion efficiency or high system efficiency) working performance by obtaining the extreme value of the working performance optimization function. When the parameter to be optimized includes emissions, the range extender can meet the requirements of low emission working performance by obtaining the extreme value of the working performance optimization function. When the parameter to be optimized includes vibration, the range extender can meet the requirements of low vibration working performance by obtaining the extreme value of the working performance optimization function. In fact, the values ​​of the working performance optimization function and the corresponding types of parameters to be optimized can also be other. This embodiment is only an example and is not limited here.

[0042] In addition, by constructing a working performance optimization function for the range extender and combining at least one of the parameters to be optimized among fuel consumption, emissions and vibration, the problem of large workload in calibration tests for the range extender can be effectively solved. There is no need to conduct calibration tests on each parameter to be optimized, thereby effectively shortening the development cycle and saving costs.

[0043] S140. Select a target operating point of the range extender according to the target power demand and the working performance optimization function; wherein the target operating point corresponds to a target speed and a target torque of the range extender.

[0044] Specifically, the range extender can meet the requirements of low fuel consumption (high oil-to-electricity conversion efficiency or high system efficiency), low emissions, low vibration and other working performance according to the value of the working performance optimization function. Exemplarily, the value of the working performance optimization function can vary according to the operating speed and operating torque of the range extender, and the operating power of the range extender can also vary according to its own operating speed and operating torque. In this way, the function curve corresponding to the working performance optimization function and the equal power curve corresponding to the target power demand can be determined respectively, and the intersection of the two curves is the required target working point. Exemplarily, in a two-dimensional coordinate system, the horizontal coordinate corresponding to the target working point can be the target speed of the range extender, and the vertical coordinate corresponding to the target working point can be the target torque of the range extender. When the range extender operates at the target working point, the corresponding working performance of the range extender, such as fuel consumption, emissions, and vibration, also meets the requirements.

[0045] The technical solution in the embodiment of the present invention first obtains the driving demand information and operating state information of the vehicle, then determines the target power demand of the range extender according to the driving demand information and the operating state information, and then constructs the working performance optimization function of the range extender; wherein the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration, and finally selects the target working point of the range extender according to the target power demand and the working performance optimization function; wherein the target working point corresponds to the target speed and target torque of the range extender. By using the above method, the working performance optimization function of the range extender is reasonably constructed, and the target speed and target torque corresponding to the optimal value of the working performance optimization function are found under the limitation of the target power demand, so as to determine the target working point of the range extender, and the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration, and can simultaneously take into account the working performance requirements of low fuel consumption (high oil-to-electricity conversion efficiency or high system efficiency), low emission, low vibration, etc., so as to quickly and accurately match the best working point and working curve of the range extender, and realize the selection and optimization effect of the working point of the range extender, which is conducive to ensuring the best working performance of the range extender and extending the service life of the range extender.

[0046] Optionally, the driving demand information includes at least accelerator pedal opening change information, brake pedal opening change information, and brake handle gear change information; the operating status information includes at least vehicle speed information, power battery remaining power information, and vehicle fault information.

[0047] Figure 3 is a flow chart of another method for selecting and switching the working point of a range extender provided by an embodiment of the present invention, and this embodiment is optimized on the basis of the above embodiment. Optionally, the range extender includes an engine;

[0048] Construct the performance optimization function of the range extender, including:

[0049] Obtaining a first performance function corresponding to a universal characteristic curve of the engine including fuel consumption parameters, a second performance function corresponding to a universal characteristic curve of the engine including emission parameters, and a third performance function corresponding to a universal characteristic curve of the engine including vibration parameters, and obtaining a first optimization weight corresponding to the fuel consumption parameters, a second optimization weight corresponding to the emission parameters, and a third optimization weight corresponding to the vibration parameters;

[0050] The operating performance optimization function of the range extender is determined according to the first performance function, the second performance function, the third performance function, the first optimization weight, the second optimization weight and the third optimization weight.

[0051] For details not yet provided in this embodiment, please refer to the above embodiments. Figure 3 As shown, the selection and switching method includes:

[0052] S210: Acquire driving demand information and operating status information of the vehicle.

[0053] S220: Determine a target power requirement of the range extender according to the driving demand information and the operating status information.

[0054] S230. Obtain a first performance function corresponding to the universal characteristic curve of the engine including fuel consumption parameters, a second performance function corresponding to the universal characteristic curve of the engine including emission parameters, and a third performance function corresponding to the universal characteristic curve of the engine including vibration parameters, and obtain a first optimization weight corresponding to the fuel consumption parameters, a second optimization weight corresponding to the emission parameters, and a third optimization weight corresponding to the vibration parameters.

[0055] Specifically, a corresponding universal characteristic curve can be established based on the engine's speed, torque, and fuel consumption parameters according to the engine bench test / calibration test to obtain the first performance function G(T, n) corresponding to the universal characteristic curve of the engine including the fuel consumption parameters. The first performance function G(T, n) is a function of the fuel consumption changing with the operating speed n and the operating torque T. For different operating speeds n and operating torque T, the operating points correspond to specific fuel consumption values. In addition, within the entire region corresponding to the operating speed n and the operating torque T, the minimum value G of the first performance function G(T, n) can be determined. min , and determine the minimum value G min The corresponding operating speed n and operating torque T. In this way, when the range extender operates at the minimum value G min Under the conditions of corresponding operating speed n and operating torque T, the range extender can achieve the working performance requirements of minimum fuel consumption (high oil-to-electricity conversion efficiency or high system efficiency).

[0056] According to the bench test / calibration test of the engine, a corresponding universal characteristic curve can be established based on the engine speed, torque, and emission parameters to obtain the second performance function E(T, n) corresponding to the universal characteristic curve of the engine including the emission parameters. Among them, the second performance function E(T, n) is a function of the emission changes with the operating speed n and the operating torque T. For different operating speeds n and torque T working points, there are corresponding specific emission values. And, in the entire area corresponding to the operating speed n and the operating torque T, the minimum value E of the second performance function E(T, n) can be determined. min , and determine the minimum value E min The corresponding operating speed n and operating torque T. In this way, when the range extender operates at the minimum value E min Under the conditions of corresponding operating speed n and operating torque T, the range extender can achieve the lowest emission working performance requirements.

[0057] According to the bench test / calibration test of the engine, a corresponding universal characteristic curve can be established based on the engine speed, torque, and vibration to obtain the third performance function D(T, n) corresponding to the universal characteristic curve of the engine including the vibration parameters. Among them, the third performance function D(T, n) is a function of the vibration changing with the operating speed n and the operating torque T. For different operating speeds n and operating torque T, the working points correspond to specific vibration values. And, in the entire area corresponding to the operating speed n and the operating torque T, the minimum value D of the second performance function D(T, n) can be determined. min , and determine the minimum value D min The corresponding operating speed n and operating torque T. In this way, when the range extender works at the minimum value D min Under the conditions of corresponding operating speed n and operating torque T, the range extender can achieve the working performance requirements with the lowest vibration.

[0058] And, obtain the first optimization weight x1 corresponding to the fuel consumption parameter, the second optimization weight x2 corresponding to the emission parameter, and the third optimization weight x3 of the vibration parameter. Among them, the first optimization weight x1 refers to the proportion of the fuel consumption parameter in the comprehensive working performance of the range extender, the second optimization weight x2 refers to the proportion of the emission parameter in the comprehensive working performance of the range extender, and the third optimization weight x3 refers to the proportion of the vibration parameter in the comprehensive working performance of the range extender. Exemplarily, the first optimization weight x1, the second optimization weight x2, and the third optimization weight x3 can be determined according to the actual working process of the range extender and the operating state of the vehicle. In this embodiment, the specific values ​​and size relationship of the first optimization weight x1, the second optimization weight x2, and the third optimization weight x3 are not specifically required or specially limited. It can be understood that when the value of the first optimization weight x1 is large, it means that the proportion of the fuel consumption parameter in the comprehensive working performance of the range extender is also large, when the value of the second optimization weight x2 is large, it means that the proportion of the emission parameter in the comprehensive working performance of the range extender is also large, and when the value of the third optimization weight x3 is large, it means that the proportion of the vibration parameter in the comprehensive working performance of the range extender is also large. Exemplarily, when the values ​​of the first optimization weight x1, the second optimization weight x2 and the third optimization weight x3 are all not zero, it means that the comprehensive working performance of the range extender needs to take into account low fuel consumption (high oil-to-electricity conversion efficiency or high system efficiency), low emissions, low vibration and other aspects.

[0059] S240. Determine a working performance optimization function of the range extender according to the first performance function, the second performance function, the third performance function, the first optimization weight, the second optimization weight, and the third optimization weight.

[0060] Optionally, according to the first performance function, the second performance function, the third performance function, the first optimization weight, the second optimization weight and the third optimization weight, determining the working performance optimization function of the range extender includes: according to the calculation formula Determine the working performance optimization function f(T,n); where n is the operating speed, T is the operating torque, G(T,n) is the first performance function, G min is the minimum value of the first performance function, E(T,n) is the second performance function, and E min is the minimum value of the second performance function, D(T,n) is the third performance function, D min is the minimum value of the third performance function, x1 is the first optimization weight, x2 is the second optimization weight, x3 is the third optimization weight, and x1∈[0,1], x2∈[0,1], x3∈[0,1], x1+x2+x3=1.

[0061] Specifically, the working performance optimization function f(T, n) is a function that combines the parameters to be optimized of fuel consumption, emissions and vibration, and can achieve a balanced consideration of the working performance of fuel consumption, emissions and vibration. It can be understood that by reasonably changing the specific values ​​and size relationships of the first optimization weight x1, the second optimization weight x2 and the third optimization weight x3, the proportion of the balanced consideration of low fuel consumption (high oil-to-electric conversion efficiency or high system efficiency), low emissions, low vibration and other aspects in the comprehensive working performance of the range extender is adjusted accordingly. Exemplarily, when the first optimization weight x1=1, the second optimization weight x2=0 and the third optimization weight x3=0, it means that the working performance optimization function f(T, n) is based on the optimization purpose of low fuel consumption working performance, so as to reasonably reduce fuel consumption, that is, to improve oil-to-electric conversion efficiency and improve system efficiency. Exemplarily, when the first optimization weight x1=0, the second optimization weight x2=1 and the third optimization weight x3=0, it means that the working performance optimization function f(T, n) is based on the optimization purpose of low emission working performance, so as to reasonably reduce emissions. Exemplarily, when the first optimization weight x1=0, the second optimization weight x2=0, and the third optimization weight x3=1, it means that the working performance optimization function f(T, n) is based on the optimization purpose of low-vibration working performance, so as to reasonably reduce vibration. Exemplarily, when the first optimization weight x1≠0, x1≠1, the second optimization weight x2≠0, x2≠1, and the third optimization weight x3≠0, x3≠1, it means that the working performance optimization function f(T, n) is the optimization purpose of taking into account low fuel consumption, low emissions, and low vibration working performance at the same time, so as to reasonably reduce fuel consumption, and at the same time reasonably reduce emissions and vibration.

[0062] Furthermore, the working performance optimization function f(T, n) is a function of the comprehensive working performance of the range extender as the operating speed n and the operating torque T change. For different operating speeds n and operating torque T, the working points correspond to specific comprehensive working performance values. In addition, within the entire region corresponding to the operating speed n and the operating torque T, the minimum value f of the working performance optimization function f(T, n) can be determined. min , and determine the minimum value f min The corresponding operating speed n and operating torque T. In this way, when the range extender operates at the minimum value f min Under the conditions of the corresponding operating speed n and operating torque T, the range extender can simultaneously meet the requirements of low fuel consumption, low emissions, and low vibration. In the calculation formula corresponding to the working performance optimization function f(T, n), the first performance function G(T, n), the second performance function E(T, n), and the third performance function D(T, n) are unknown functions, but they can be substituted into the specific operating speed n and operating torque T to calculate the numerical results. The minimum value of the first performance function G min , the minimum value of the second performance function E minThe minimum value D of the third performance function min It can be determined according to the calculation results of the first performance function G(T, n), the second performance function E(T, n) and the third performance function D(T, n) in the full range of the operating speed n and the operating torque T, which can be understood as a known quantity. The first optimization weight x1, the second optimization weight x2 and the third optimization weight x3 can be determined according to the actual working process of the range extender and the operating state of the vehicle, which can also be understood as a known quantity.

[0063] S250. Select a target operating point of the range extender according to the target power demand and the working performance optimization function; wherein the target operating point corresponds to a target speed and a target torque of the range extender.

[0064] Figure 4 is a flow chart of another method for selecting and switching the working point of a range extender provided by an embodiment of the present invention. This embodiment is optimized on the basis of the above embodiment. Optionally, the working performance optimization function is a function that changes with the operating speed and operating torque of the range extender;

[0065] According to the target power demand and the working performance optimization function, the target operating point of the range extender is selected, including:

[0066] According to the target power demand, the intermediate operating speed and the intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function are determined, and the intermediate operating speed is defined as the target speed, and the intermediate operating torque is defined as the target torque; wherein the product of the intermediate operating speed and the intermediate operating torque is in direct proportion to the target power demand.

[0067] For details not yet provided in this embodiment, please refer to the above embodiments. Figure 4 As shown, the selection and switching method includes:

[0068] S310: Acquire driving demand information and operating status information of the vehicle.

[0069] S320: Determine a target power requirement of the range extender according to the driving demand information and the operating status information.

[0070] S330, constructing a working performance optimization function of the range extender; wherein the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration.

[0071] S340. According to the target power demand, determine the intermediate operating speed and intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function, and define the intermediate operating speed as the target speed, and define the intermediate operating torque as the target torque; wherein the product of the intermediate operating speed and the intermediate operating torque is in direct proportion to the target power demand.

[0072] Specifically, the value of the working performance optimization function f(T, n) can vary according to the operating speed n and the operating torque T of the range extender. In the full region corresponding to the operating speed n and the operating torque T, the minimum value f of the working performance optimization function f(T, n) can be determined. min , and determine the minimum value f min The corresponding operating speed n and operating torque T. In this way, when the range extender operates at the minimum value f min Under the conditions of the corresponding operating speed n and operating torque T, the range extender can simultaneously meet the requirements of low fuel consumption, low emissions and low vibration working performance. In addition, the operating power P of the range extender can also change according to its own operating speed n and operating torque T. In the entire area corresponding to the operating speed n and the operating torque T, according to the calculation formula P = (T×n) / 9550, under the premise of knowing the value of the target power demand, the numerical relationship between the operating speed n and the operating torque T can be reversely determined. In this way, the equal power curve corresponding to the target power demand can be determined, and based on the corresponding relationship between all the operating speeds n and the operating torque T in the entire area of ​​the equal power curve, they are substituted into the working performance optimization function f(T, n) respectively to determine the minimum value f of the working performance optimization function f(T, n) min In other words, the intermediate operating speed and intermediate operating torque not only meet the requirements of the positive proportional relationship of the target power demand, but also meet the minimum value f of the working performance optimization function f(T, n). min The requirement for the establishment of the function can be understood as finding the minimum value f on the equal power curve that makes the working performance optimization function f(T, n) reach the minimum value f min After that, the intermediate operating speed can be defined as the target speed, and the intermediate operating torque can be defined as the target torque, so as to determine the target operating point for adjusting the working performance of the range extender. The corresponding horizontal coordinate of the target operating point can be the target speed of the range extender, and the corresponding vertical coordinate of the target operating point can be the target torque of the range extender.

[0073] Furthermore, in one embodiment, Figure 5 is a universal characteristic diagram of an optimal fuel consumption working curve and an equal power curve fitting provided by an embodiment of the present invention, such as Figure 5As shown, the universal characteristic diagram of the range extender takes the operating speed n as the horizontal axis and the operating torque T as the vertical axis. The solid line curve arranged similarly to the contour lines in the figure is the fuel consumption characteristic curve of the range extender, that is, the curve corresponding to the first performance function G(T, n), which represents the fuel consumption characteristics of the range extender under a specific speed and a specific torque. The fuel consumption values ​​corresponding to each coordinate point on the same continuous fuel consumption characteristic curve are the same. The multiple smooth dotted curves from the upper left to the lower right in the figure are the isopower curves of the range extender, which represent the power output of the range extender under a specific speed and a specific torque. The power values ​​corresponding to each coordinate point on the same continuous isopower curve are the same. The optimal fuel consumption working curve is obtained by determining the coordinate points corresponding to the minimum fuel consumption under the corresponding power values ​​among all possible speed-torque coordinate points, and smoothly connecting the coordinate points corresponding to these minimum fuel consumption values ​​into lines. It can be understood that the calculation process of the minimum fuel consumption can be to set the first optimization weight x1 in the calculation formula corresponding to the working performance optimization function f(T, n) to 1, the second optimization weight x2 to 0, and the third optimization weight x3 to 0, and substitute the corresponding operating speed n and operating torque T into the working performance optimization function f(T, n) to find the minimum value of the working performance optimization function f(T, n), that is, the minimum energy consumption value. In this way, after determining the optimal fuel consumption working curve, the intersection of the two curves can be found according to the equal power curve corresponding to the target power demand, and the intersection is the target working point, the horizontal coordinate of the intersection is the target speed, and the vertical coordinate of the intersection is the target torque. Alternatively, during the change of the target power demand, the range extender can be controlled to work along the optimal fuel consumption working curve. There is no need to repeat the drawing in the future, which greatly reduces the calibration test workload of the range extender, thereby effectively shortening the development cycle and saving costs. That is, when the range extender determines the target working point based on the optimization purpose of the working performance of low fuel consumption, it can refer to Figure 5 The optimum fuel consumption working curve is determined by the intersection of the equal power curve.

[0074] In another specific embodiment, Figure 6 is a universal characteristic diagram of an optimal emission working curve and an isopower curve fitting provided by an embodiment of the present invention, such as Figure 6As shown, the universal characteristic diagram of the range extender takes the operating speed n as the horizontal axis and the operating torque T as the vertical axis. The solid line curve arranged similarly to the contour lines in the figure is the emission characteristic curve of the range extender, that is, the curve corresponding to the second performance function E(T, n), which represents the emission characteristics of the range extender under a specific speed and a specific torque. The emission values ​​corresponding to each coordinate point on the same continuous emission characteristic curve are the same. The multiple smooth dotted curves from the upper left to the lower right in the figure are the isopower curves of the range extender, which represent the power output of the range extender under a specific speed and a specific torque. The power values ​​corresponding to each coordinate point on the same continuous isopower curve are the same. The optimal emission working curve is obtained by determining the coordinate point corresponding to the minimum emission value under the corresponding power value among all possible speed-torque coordinate points, and smoothly connecting the coordinate points corresponding to these minimum emission values ​​into lines. It can be understood that the calculation process of the minimum emission value can be to set the first optimization weight x1 in the calculation formula corresponding to the working performance optimization function f(T, n) to 0, the second optimization weight x2 to 1, and the third optimization weight x3 to 0, and substitute the corresponding operating speed n and operating torque T into the working performance optimization function f(T, n) to find the minimum value of the working performance optimization function f(T, n), that is, the minimum emission value. In this way, after determining the optimal emission working curve, the intersection of the two curves can be found according to the equal power curve corresponding to the target power demand, and the intersection is the target working point, the horizontal coordinate of the intersection is the target speed, and the vertical coordinate of the intersection is the target torque. Alternatively, during the change of the target power demand, the range extender can be controlled to work along the optimal emission working curve. There is no need to repeat the drawing later, which greatly reduces the calibration test workload of the range extender, thereby effectively shortening the development cycle and saving costs. That is, when the range extender determines the target working point based on the optimization purpose of low-emission working performance, it can refer to Figure 6 It depends on the intersection of the optimal emission working curve and the equal power curve.

[0075] In yet another specific embodiment, Figure 7 is a universal characteristic diagram of an optimal vibration working curve and an equal power curve fitting provided by an embodiment of the present invention, such as Figure 7As shown, the universal characteristic diagram of the range extender takes the operating speed n as the horizontal axis and the operating torque T as the vertical axis. The solid line curve arranged similarly to the contour lines in the figure is the vibration characteristic curve of the range extender, that is, the curve corresponding to the third performance function D(T, n), which represents the vibration characteristics of the range extender under a specific speed and a specific torque. The vibration values ​​corresponding to each coordinate point on the same continuous vibration characteristic curve are the same. The multiple smooth dotted curves from the upper left to the lower right in the figure are the equal power curves of the range extender, which represent the power output of the range extender under a specific speed and a specific torque. The power values ​​corresponding to each coordinate point on the same continuous equal power curve are the same. The optimal vibration working curve is obtained by determining the coordinate points corresponding to the minimum vibration value under the corresponding power value among all possible speed-torque coordinate points, and smoothly connecting the coordinate points corresponding to these minimum vibration values ​​into lines. It can be understood that the calculation process of the minimum vibration value can be to set the first optimization weight x1 in the calculation formula corresponding to the working performance optimization function f(T, n) to 0, the second optimization weight x2 to 0 and the third optimization weight x3 to 1, and substitute the corresponding operating speed n and operating torque T into the working performance optimization function f(T, n) to find the minimum value of the working performance optimization function f(T, n), that is, the minimum vibration value. In this way, after determining the optimal vibration working curve, the intersection of the two curves can be found according to the equal power curve corresponding to the target power demand, and the intersection is the target working point, the horizontal coordinate of the intersection is the target speed, and the vertical coordinate of the intersection is the target torque. Alternatively, during the change of the target power demand, the range extender can be controlled to work along the optimal vibration working curve. There is no need to repeat the drawing in the future, which greatly reduces the calibration test workload of the range extender, thereby effectively shortening the development cycle and saving costs. That is, when the range extender determines the target working point based on the optimization purpose of low-vibration working performance, it can refer to Figure 7 The optimum vibration working curve is determined by the intersection of the equal power curve.

[0076] Similarly, in another specific implementation, Figure 8 is a universal characteristic diagram of an optimal comprehensive working curve and an equal power curve fitting provided by an embodiment of the present invention, such as Figure 8As shown, the universal characteristic diagram of the range extender takes the operating speed n as the horizontal axis and the operating torque T as the vertical axis. The multiple smooth dotted curves from the upper left to the lower right in the figure are the isopower curves of the range extender, which represent the power output of the range extender at a specific speed and a specific torque. The power values ​​corresponding to the coordinate points on the same continuous isopower curve are the same. The optimal comprehensive working curve can be understood as the optimization purpose of taking into account the working performance of low fuel consumption, low emissions and low vibration at the same time. It is obtained by determining the coordinate points corresponding to the minimum value of the comprehensive performance under the corresponding power value among all possible speed-torque coordinate points, and smoothly connecting the coordinate points corresponding to these minimum values ​​of the comprehensive performance into lines. It can be understood that the calculation process of the minimum comprehensive performance can be to set the first optimization weight x1 in the calculation formula corresponding to the working performance optimization function f(T, n) to a value between 0-1, the second optimization weight x2 to a value between 0-1, and the third optimization weight x3 to a value between 0-1, and substitute the corresponding operating speed n and operating torque T into the working performance optimization function f(T, n) to find the minimum value of the working performance optimization function f(T, n), that is, the minimum comprehensive performance value. In this way, after determining the optimal comprehensive working curve, the intersection of the two curves can be found according to the equal power curve corresponding to the target power demand, and the intersection is the target working point, the horizontal coordinate of the intersection is the target speed, and the vertical coordinate of the intersection is the target torque, or, in the process of changing the target power demand, the range extender can be controlled to work along the optimal comprehensive working curve. There is no need to repeat the drawing in the future, which greatly reduces the calibration test workload of the range extender, thereby effectively shortening the development cycle and saving costs. That is, when the range extender determines the target operating point based on the optimization purpose of low fuel consumption, low emissions, and low vibration performance, it can refer to Figure 8 The optimum comprehensive working curve is determined by the intersection of the equal power curve.

[0077] Optionally, before determining the intermediate operating speed and intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function according to the target power requirement, and defining the intermediate operating speed as the target speed, and defining the intermediate operating torque as the target torque, it also includes: obtaining the target speed selection interval and the target torque selection interval of the range extender; determining the intermediate operating speed and intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function according to the target power requirement, and defining the intermediate operating speed as the target speed, and defining the intermediate operating torque as the target torque, including: within the target speed selection interval, determining the intermediate operating speed of the range extender corresponding to the minimum value of the working performance optimization function according to the target power requirement, and, within the target torque selection interval, determining the intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function according to the target power requirement.

[0078] Further, the range extender includes an engine and a generator; obtaining a target speed selection interval and a target torque selection interval of the range extender includes: determining the target speed selection interval and the target torque selection interval based on at least one of a universal characteristic curve including fuel consumption parameters of the engine, a universal characteristic curve including emission parameters of the engine, and a universal characteristic curve including vibration parameters of the engine, and a universal characteristic curve including efficiency parameters of the generator.

[0079] Specifically, before determining the intermediate operating speed and the intermediate operating torque, it is also necessary to determine the target speed selection interval and the target torque selection interval, so as to find the intermediate operating speed (that is, the target speed) in the target speed selection interval and the intermediate operating torque (that is, the target torque) in the target torque selection interval. In this way, the working performance of the range extender can be further improved, and the range extender can be operated in the high-efficiency zone to the maximum extent while ensuring basic driving comfort. In other words, the corresponding intermediate operating speed is determined between the minimum speed value and the maximum speed value in the target speed selection interval. The corresponding intermediate operating torque is determined between the minimum torque value and the maximum torque value in the target torque selection interval.

[0080] In a specific embodiment, continue to refer to Figure 5 According to the bench test / calibration test of the engine, a corresponding universal characteristic curve can be established based on the engine speed, torque, and fuel consumption parameters to obtain the speed range of the operating speed n and the torque range of the operating torque T corresponding to the universal characteristic curve containing the fuel consumption parameters of the engine. And, according to the bench test / calibration test of the generator, a corresponding universal characteristic curve can be established based on the generator speed, torque, and efficiency parameters to obtain the speed range of the operating speed n and the torque range of the operating torque T corresponding to the universal characteristic curve containing the efficiency parameters of the generator. Afterwards, the speed range of the operating speed n corresponding to the universal characteristic curve containing the fuel consumption parameters of the engine and the speed range of the operating speed n corresponding to the universal characteristic curve containing the efficiency parameters of the generator can be intersected to determine the target speed selection range. Similarly, the torque range of the operating torque T corresponding to the universal characteristic curve containing the fuel consumption parameters of the engine and the torque range of the operating torque T corresponding to the universal characteristic curve containing the efficiency parameters of the generator can be determined to determine the target torque selection range.

[0081] In another specific embodiment, continue to refer to Figure 6According to the bench test / calibration test of the engine, a corresponding universal characteristic curve can be established based on the engine speed, torque, and emission parameters to obtain the speed range of the operating speed n and the torque range of the operating torque T corresponding to the universal characteristic curve containing emission parameters of the engine. And, according to the bench test / calibration test of the generator, a corresponding universal characteristic curve can be established based on the speed, torque, and efficiency parameters of the generator to obtain the speed range of the operating speed n and the torque range of the operating torque T corresponding to the universal characteristic curve containing efficiency parameters of the generator. Afterwards, the speed range of the operating speed n corresponding to the universal characteristic curve containing emission parameters of the engine and the speed range of the operating speed n corresponding to the universal characteristic curve containing efficiency parameters of the generator can be intersected to determine the target speed selection range. Similarly, the torque range of the operating torque T corresponding to the universal characteristic curve containing emission parameters of the engine and the torque range of the operating torque T corresponding to the universal characteristic curve containing efficiency parameters of the generator can be determined to determine the target torque selection range.

[0082] In another specific embodiment, continue to refer to Figure 7 According to the bench test / calibration test of the engine, a corresponding universal characteristic curve can be established based on the engine speed, torque, and vibration parameters to obtain the speed range of the operating speed n and the torque range of the operating torque T corresponding to the universal characteristic curve containing vibration parameters of the engine. And, according to the bench test / calibration test of the generator, a corresponding universal characteristic curve can be established based on the generator speed, torque, and efficiency parameters to obtain the speed range of the operating speed n and the torque range of the operating torque T corresponding to the universal characteristic curve containing efficiency parameters of the generator. Afterwards, the speed range of the operating speed n corresponding to the universal characteristic curve containing vibration parameters of the engine and the speed range of the operating speed n corresponding to the universal characteristic curve containing efficiency parameters of the generator can be intersected to determine the target speed selection range. Similarly, the torque range of the operating torque T corresponding to the universal characteristic curve containing vibration parameters of the engine and the torque range of the operating torque T corresponding to the universal characteristic curve containing efficiency parameters of the generator can be determined to determine the target torque selection range.

[0083] In another specific embodiment, continue to refer to Figure 8According to the bench test / calibration test of the engine, a corresponding universal characteristic curve can be established based on the engine speed, torque, fuel consumption parameters, emission parameters, and vibration parameters to obtain the speed range of the operating speed n and the torque range of the operating torque T corresponding to the universal characteristic curve containing fuel consumption parameters, emission parameters, and vibration parameters of the engine. And, according to the bench test / calibration test of the generator, a corresponding universal characteristic curve can be established based on the generator speed, torque, and efficiency parameters to obtain the speed range of the operating speed n and the torque range of the operating torque T corresponding to the universal characteristic curve containing efficiency parameters of the generator. Afterwards, the speed range of the operating speed n corresponding to the universal characteristic curve containing fuel consumption parameters of the engine, the speed range of the operating speed n corresponding to the universal characteristic curve containing emission parameters of the engine, the speed range of the operating speed n corresponding to the universal characteristic curve containing vibration parameters of the engine, and the speed range of the operating speed n corresponding to the universal characteristic curve containing efficiency parameters of the generator can be intersected to determine the target speed selection range. Similarly, the target torque selection range can be determined by the torque range of the operating torque T corresponding to the universal characteristic curve of the engine including fuel consumption parameters, the torque range of the operating torque T corresponding to the universal characteristic curve of the engine including emission parameters, the torque range of the operating torque T corresponding to the universal characteristic curve of the engine including vibration parameters, and the torque range of the operating torque T corresponding to the universal characteristic curve of the generator including efficiency parameters.

[0084] Fig. 9 1 is a flow chart of another method for selecting and switching the working point of a range extender provided in an embodiment of the present invention. This embodiment is optimized on the basis of the above embodiment. Optionally, according to the driving demand information and the operating status information, while determining the target power demand of the range extender, it also includes:

[0085] Determine the target response requirement of the range extender based on driving demand information and operating status information;

[0086] According to the target power demand and the working performance optimization function, after selecting the target working point of the range extender, it also includes:

[0087] According to the target response requirements, the operating mode of the range extender is determined, and the range extender is made to operate under the conditions of target speed and target torque.

[0088] For details not yet provided in this embodiment, please refer to the above embodiments. Fig. 9 As shown, the selection and switching method includes:

[0089] S410: Acquire driving demand information and operating status information of the vehicle.

[0090] S420: Determine a target power requirement of the range extender and a target response requirement of the range extender according to the driving requirement information and the operating status information.

[0091] Specifically, continue to refer to Figure 2 It can be understood that the vehicle controller VCU can determine the target response requirements of the vehicle according to the vehicle control strategy, as well as the acquired driving demand information and operating status information. For example, the vehicle controller VCU can determine the target response requirements corresponding to the normal driving of the vehicle according to the vehicle driving state of the vehicle, or the vehicle controller VCU can determine the target response requirements corresponding to the normal braking of the vehicle according to the vehicle braking state of the vehicle. Afterwards, the vehicle controller VCU can also allocate the target response requirements of the vehicle according to the working performance of the range extender module 20 and the power information of the power battery module 10 to determine the target response requirements of the range extender module 20.

[0092] S430, constructing a working performance optimization function of the range extender; wherein the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration.

[0093] S440. Select a target operating point of the range extender according to the target power demand and the working performance optimization function; wherein the target operating point corresponds to a target speed and a target torque of the range extender.

[0094] S450: Determine the operating mode of the range extender according to the target response requirement, and make the range extender operate under the conditions of target speed and target torque.

[0095] Optionally, the range extender includes an engine and a generator; according to the target response requirement, the operating mode of the range extender is determined, and the range extender is made to operate under the conditions of a target speed and a target torque, including: when the target response requirement is less than a first preset response threshold, the operating mode of the range extender is determined to be that the engine controls the operating speed to reach the target speed, and the generator controls the operating torque to reach the target torque; when the target response requirement is greater than or equal to the first preset response threshold, the operating mode of the range extender is determined to be that the engine controls the operating torque to reach the target torque, and the generator controls the operating speed to reach the target speed.

[0096] It is understandable that, due to the different working principles of the engine and the generator, the speed of change of the target response demand of the engine and the generator is also different. Among them, since the response speed of the change of the injection speed of the engine is slow, in order to ensure the running stability of the engine, the engine can be used to control the speed to achieve the switching of the working point when the target response demand is small. Exemplarily, the unit of the target response demand and the first preset response threshold can be kW / s, which means the rate of change of the power demand. Specifically, when the target response demand is less than the first preset response threshold, it can be determined that the working mode of the range extender is the engine controlling the change of the running speed and the generator controlling the change of the running torque, so that the working point of the range extender is switched to the coordinate point corresponding to the target speed and the target torque. When the target response demand is greater than or equal to the first preset response threshold, it can be determined that the working mode of the range extender is the engine controlling the change of the running torque and the generator controlling the change of the running speed, so that the working point of the range extender is switched to the coordinate point corresponding to the target speed and the target torque. In this way, it is conducive to achieving the corresponding speed of adjustment of the higher target power demand.

[0097] Fig.10 is a flow chart of another method for selecting and switching the working point of a range extender provided by an embodiment of the present invention, such as Fig.10As shown, it can be understood as the whole process of selecting and switching the working point of the range extender during the driving process of the vehicle. First, the driving demand information and operating status information of the vehicle are obtained so that the vehicle controller VCU can determine the target power demand of the range extender, the target power demand of the power battery and the target response demand of the range extender according to the vehicle control strategy, driving demand and braking demand. Then, the optimal working point or optimal working curve of the range extender can be obtained according to the target power demand of the range extender and the optimization purpose of the working performance of the range extender. Exemplarily, if the range extender optimizes the working performance with low fuel consumption as the priority, the first optimization weight x1=1, the second optimization weight x2=0 and the third optimization weight x3=0 in the working performance optimization function f(T, n) can be set to reasonably reduce fuel consumption, that is, to improve the oil-electric conversion efficiency and improve the system efficiency. If the range extender optimizes the working performance with low emission as the priority, the first optimization weight x1=0, the second optimization weight x2=1 and the third optimization weight x3=0 in the working performance optimization function f(T, n) can be set to reasonably reduce emissions. If the range extender optimizes the working performance with low vibration priority, the first optimization weight x1=0, the second optimization weight x2=0 and the third optimization weight x3=1 in the working performance optimization function f(T, n) can be set to reasonably reduce vibration. If the range extender optimizes the working performance with comprehensive priority, the first optimization weight x1≠0, x1≠1, the second optimization weight x2≠0, x2≠1 and the third optimization weight x3≠0, x3≠1 in the working performance optimization function f(T, n) can be set to take into account the working performance of low fuel consumption, low emissions and low vibration at the same time, so as to reasonably reduce fuel consumption, emissions and vibration. At the same time, the working mode of the range extender can also be determined according to the target response requirements of the range extender. Finally, the working point of the range extender can be switched according to the working mode of the range extender and the working point or working curve corresponding to the optimization purpose of the range extender, that is, the range extender operates under the conditions of target speed and target torque. Alternatively, the working point of the range extender may be switched along the working curve according to the working mode of the range extender and the working curve corresponding to the optimization purpose of the range extender.

[0098] Fig.11 The present invention provides a schematic diagram of a device for selecting and switching the working point of a range extender. The device can be used to adjust the working performance of the range extender during the driving of the range-extended electric vehicle. The device can be implemented in the form of hardware and / or software and is generally configured in the control panel. Fig.11 As shown, the selection and switching device includes:

[0099] The information acquisition module 510 is used to obtain the driving demand information and operating status information of the vehicle; the power determination module 520 is used to determine the target power demand of the range extender according to the driving demand information and the operating status information; the function construction module 530 is used to construct the working performance optimization function of the range extender; wherein the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration; the working point selection module 540 is used to select the target working point of the range extender according to the target power demand and the working performance optimization function; wherein the target working point corresponds to the target speed and target torque of the range extender.

[0100] The technical solution in the embodiment of the present invention reasonably constructs a working performance optimization function of the range extender, and finds the target speed and target torque corresponding to the optimal value of the working performance optimization function under the limitation of the target power demand, so as to determine the target working point of the range extender. The working performance optimization function includes at least one parameter to be optimized among fuel consumption, emissions and vibrations, and can take into account the working performance requirements of low fuel consumption (high oil-to-electricity conversion efficiency or high system efficiency), low emissions, low vibrations, etc., so as to quickly and accurately match the optimal working point and working curve of the range extender, thereby achieving the effect of selecting and optimizing the working point of the range extender, which is conducive to ensuring the optimal working performance of the range extender and extending the service life of the range extender.

[0101] Based on the above technical solution, optionally, the range extender includes an engine; the function construction module 530 may specifically include a parameter and weight acquisition unit and a function construction unit, the parameter and weight acquisition unit is used to obtain a first performance function corresponding to the universal characteristic curve of the engine including fuel consumption parameters, a second performance function corresponding to the universal characteristic curve of the engine including emission parameters, and a third performance function corresponding to the universal characteristic curve of the engine including vibration parameters, as well as obtaining a first optimization weight corresponding to the fuel consumption parameters, a second optimization weight corresponding to the emission parameters, and a third optimization weight corresponding to the vibration parameters; the function construction unit is used to determine the working performance optimization function of the range extender according to the first performance function, the second performance function, the third performance function, the first optimization weight, the second optimization weight, and the third optimization weight.

[0102] Optionally, the function construction unit may include a function construction subunit, which is used to calculate the function according to the calculation formula Determine the working performance optimization function f(T,n); where n is the operating speed, T is the operating torque, G(T,n) is the first performance function, G min is the minimum value of the first performance function, E(T,n) is the second performance function, and E min is the minimum value of the second performance function, D(T,n) is the third performance function, D minis the minimum value of the third performance function, x1 is the first optimization weight, x2 is the second optimization weight, x3 is the third optimization weight, and x1∈[0,1], x2∈[0,1], x3∈[0,1], x1+x2+x3=1.

[0103] Optionally, the working performance optimization function is a function that changes with the operating speed and operating torque of the range extender; the working point selection module 540 may specifically include a working point selection unit, which is used to determine the intermediate operating speed and intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function according to the target power requirement, and define the intermediate operating speed as the target speed, and define the intermediate operating torque as the target torque; wherein the product of the intermediate operating speed and the intermediate operating torque is directly proportional to the target power requirement.

[0104] Optionally, the selection and switching device also includes a selection interval acquisition module, which is used to obtain a target speed selection interval and a target torque selection interval of the range extender; the working point selection unit may specifically include a working point selection subunit, which is used to determine, within the target speed selection interval, according to the target power requirement, the intermediate operating speed of the range extender corresponding to the minimum value of the working performance optimization function, and, within the target torque selection interval, according to the target power requirement, determine the intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function.

[0105] Optionally, the range extender includes an engine and a generator; the selection interval acquisition module may specifically include a selection interval acquisition unit, which is used to determine the target speed selection interval and the target torque selection interval based on at least one of the universal characteristic curve of the engine including fuel consumption parameters, the universal characteristic curve of the engine including emission parameters, and the universal characteristic curve of the engine including vibration parameters, and the universal characteristic curve of the generator including efficiency parameters.

[0106] Optionally, the selection and switching device also includes a response determination module, which is used to determine the target response requirement of the range extender based on the driving demand information and the operating status information; the selection and switching device also includes a working point switching module, which is used to determine the working mode of the range extender based on the target response requirement, and make the range extender operate under the conditions of target speed and target torque.

[0107] Optionally, the range extender includes an engine and a generator; the operating point switching module may specifically include an operating point switching unit, which is used to determine that the operating mode of the range extender is that the engine controls the operating speed to reach the target speed, and the generator controls the operating torque to reach the target torque when the target response requirement is less than a first preset response threshold; when the target response requirement is greater than or equal to the first preset response threshold, determine that the operating mode of the range extender is that the engine controls the operating torque to reach the target torque, and the generator controls the operating speed to reach the target speed.

[0108] Optionally, the driving demand information includes at least accelerator pedal opening change information, brake pedal opening change information, and brake handle gear change information; the operating status information includes at least vehicle speed information, power battery remaining power information, and vehicle fault information.

[0109] The device for selecting and switching the operating point of a range extender provided in an embodiment of the present invention can execute the method for selecting and switching the operating point of a range extender provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0110] Fig.12 It is a schematic diagram of the structure of a terminal device provided by an embodiment of the present invention. The terminal device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The terminal device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0111] like Fig.12 As shown, the terminal device 100 includes one or more processors 110, and a storage device, which is communicatively connected to the processor 110, such as a read-only memory (ROM) 120, a random access memory (RAM) 130, etc., wherein the storage device stores a computer program that can be executed by one or more processors, and the processor 110 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 120 or the computer program loaded from the storage unit 180 to the random access memory (RAM) 130. In the RAM 130, various programs and data required for the operation of the terminal device 100 can also be stored. The processor 110, the ROM 120, and the RAM 130 are connected to each other via a bus 140. An input / output (I / O) interface 150 is also connected to the bus 140.

[0112] A number of components in the terminal device 100 are connected to the I / O interface 150, including: an input unit 160, such as a keyboard, a mouse, etc.; an output unit 170, such as various types of displays, speakers, etc.; a storage unit 180, such as a disk, an optical disk, etc.; and a communication unit 190, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 190 allows the terminal device 100 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0113] The processor 110 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 110 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 110 executes the various methods and processes described above, such as the selection and switching method of the range extender operating point.

[0114] In some embodiments, the method for selecting and switching the operating point of the range extender may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 180. In some embodiments, part or all of the computer program may be loaded and / or installed on the terminal device 100 via the ROM 120 and / or the communication unit 190. When the computer program is loaded into the RAM 130 and executed by the processor 110, one or more steps of the method for selecting and switching the operating point of the range extender described above may be performed. Alternatively, in other embodiments, the processor 110 may be configured to execute the method for selecting and switching the operating point of the range extender in any other appropriate manner (e.g., by means of firmware).

[0115] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0116] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0117] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0118] To provide interaction with a user, the systems and techniques described herein may be implemented on a terminal device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball), through which the user can provide input to the terminal device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0119] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0120] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0121] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0122] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for selecting and switching a range extender operating point, characterized in that: include: Obtain driving demand information and operating status information of the vehicle; determining a target power requirement of a range extender according to the driving requirement information and the operating state information; Constructing a working performance optimization function of the range extender; wherein the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration; According to the target power demand and the working performance optimization function, a target operating point of the range extender is selected; wherein the target operating point corresponds to a target speed and a target torque of the range extender.

2. The selection and switching method according to claim 1, characterized in that: The range extender includes an engine; Constructing the working performance optimization function of the range extender, including: Obtaining a first performance function corresponding to the universal characteristic curve of the engine including fuel consumption parameters, a second performance function corresponding to the universal characteristic curve of the engine including emission parameters, and a third performance function corresponding to the universal characteristic curve of the engine including vibration parameters, and obtaining a first optimization weight corresponding to the fuel consumption parameters, a second optimization weight corresponding to the emission parameters, and a third optimization weight corresponding to the vibration parameters; An operating performance optimization function of the range extender is determined according to the first performance function, the second performance function, the third performance function, the first optimization weight, the second optimization weight, and the third optimization weight.

3. The selection and switching method according to claim 2, characterized in that: Determining the working performance optimization function of the range extender according to the first performance function, the second performance function, the third performance function, the first optimization weight, the second optimization weight, and the third optimization weight includes: According to the calculation formula Determine the working performance optimization function f(T,n); wherein n is the operating speed, T is the operating torque, G(T,n) is the first performance function, G min is the minimum value of the first performance function, E(T, n) is the second performance function, and E min is the minimum value of the second performance function, D(T,n) is the third performance function, and D min is the minimum value of the third performance function, x1 is the first optimization weight, x2 is the second optimization weight, x3 is the third optimization weight, and x1∈[0,1], x2∈[0,1], x3∈[0,1], x1+x2+x3=1.

4. The selection and switching method according to claim 1, characterized in that: The working performance optimization function is a function that changes with the operating speed and operating torque of the range extender; According to the target power demand and the working performance optimization function, a target working point of the range extender is selected, including: According to the target power demand, an intermediate operating speed and an intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function are determined, and the intermediate operating speed is defined as the target speed, and the intermediate operating torque is defined as the target torque; wherein the product of the intermediate operating speed and the intermediate operating torque is in direct proportion to the target power demand.

5. The selection and switching method according to claim 4, characterized in that: Before determining the intermediate operating speed and intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function according to the target power demand, and defining the intermediate operating speed as the target speed and the intermediate operating torque as the target torque, the method further includes: Obtaining a target speed selection interval and a target torque selection interval of the range extender; Determining, according to the target power demand, an intermediate operating speed and an intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function, and defining the intermediate operating speed as the target speed, and defining the intermediate operating torque as the target torque, including: Within the target speed selection interval, the intermediate operating speed of the range extender corresponding to the minimum value of the working performance optimization function is determined according to the target power requirement, and, within the target torque selection interval, the intermediate operating torque of the range extender corresponding to the minimum value of the working performance optimization function is determined according to the target power requirement.

6. The selection and switching method according to claim 5, characterized in that: The range extender includes an engine and a generator; Obtaining a target speed selection interval and a target torque selection interval of the range extender, including: The target speed selection range and the target torque selection range are determined based on at least one of the universal characteristic curve of the engine including fuel consumption parameters, the universal characteristic curve of the engine including emission parameters, and the universal characteristic curve of the engine including vibration parameters, as well as the universal characteristic curve of the generator including efficiency parameters.

7. The selection and switching method according to claim 1, characterized in that: Determining the target power requirement of the range extender according to the driving demand information and the operating state information also includes: determining a target response requirement of the range extender according to the driving demand information and the operating state information; After selecting the target operating point of the range extender according to the target power demand and the working performance optimization function, the method further includes: According to the target response requirement, the operating mode of the range extender is determined, and the range extender is made to operate under the conditions of the target speed and the target torque.

8. The selection and switching method according to claim 7, characterized in that: The range extender includes an engine and a generator; Determining the operating mode of the range extender according to the target response requirement, and making the range extender operate under the conditions of the target speed and the target torque, including: When the target response requirement is less than a first preset response threshold, determining that the operating mode of the range extender is that the engine controls the operating speed to reach the target speed, and the generator controls the operating torque to reach the target torque; When the target response demand is greater than or equal to the first preset response threshold, the operating mode of the range extender is determined as the engine controlling the operating torque to reach the target torque, and the generator controlling the operating speed to reach the target speed.

9. The selection and switching method according to claim 1, characterized in that: The driving demand information includes at least accelerator pedal opening change information, brake pedal opening change information, and brake handle gear change information; the operating status information includes at least vehicle speed information, power battery remaining power information, and vehicle fault information.

10. A device for selecting and switching the working point of a range extender, characterized in that: include: An information acquisition module, used to acquire driving demand information and operating status information of the vehicle; a power determination module, configured to determine a target power requirement of the range extender according to the driving requirement information and the operating state information; A function construction module, used to construct a working performance optimization function of the range extender; wherein the working performance optimization function includes at least one parameter to be optimized among fuel consumption, emission and vibration; The operating point selection module is used to select the target operating point of the range extender according to the target power demand and the working performance optimization function; wherein the target operating point corresponds to the target speed and target torque of the range extender.

11. A terminal device, characterized in that: include: one or more processors; A storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method for selecting and switching the operating point of the range extender as described in any one of claims 1-9.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for selecting and switching the operating point of the range extender as described in any one of claims 1 to 9 is implemented.

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