Range extender energy management method, device and equipment and medium

Abstract

The invention provides a range extender energy management method and device, equipment and a medium, and effectively solves the problem that the overall performance of a vehicle is affected due to the defects of an existing range extender energy management strategy. The method comprises the steps that calculation is conducted based on the treading depth of an accelerator, and the driving required mechanical power of the vehicle is obtained; obtaining vehicle driving demand electric power based on the driving demand mechanical power of the vehicle; processing the generated power range of the range extender to obtain a generated power sequence of the range extender and a corresponding lowest fuel consumption power sequence, and calculating to obtain a battery net power sequence and a corresponding battery total power sequence; and calculating the generated power sequence of the range extender to obtain a corresponding power fluctuation penalty value sequence, so as to obtain the optimal generated power of the range extender based on the range extender power generation target model, control the rotating speed and torque of the engine, and ensure the fuel economy of the range extender, the stability of the SOC of the battery and the NVH performance of the vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle energy management, and in particular to a range extender energy management method, device, equipment and medium. Background Art

[0002] The extended-range hybrid vehicle is driven by an electric motor and has good power, responsiveness, and driving smoothness. When the power battery is fully charged, the power battery alone supplies power to the electric drive system; when the power battery is low, the range extender starts to generate electricity. The range extender is a power generation unit composed of an engine and an ISG motor. There is no mechanical connection between the range extender and the electric drive system, so the engine speed / torque and the wheel-end vehicle speed / torque are completely decoupled, and the vehicle can always operate in the high-efficiency zone, with good fuel economy.

[0003] If the power generation of the range extender is greater than the sum of the power consumption of the electric drive system and vehicle accessories (such as electronic water pumps, electronic fans, etc.), the remaining power is stored in the power battery; if the power generation of the range extender is lower than the sum of the power consumption of the electric drive system and vehicle accessories (such as electronic water pumps, electronic fans, etc.), the power stored in the power battery is released again. Due to the existence of battery internal resistance, the storage and release process of power will produce energy loss. Therefore, the power generated by the range extender should be used for driving as much as possible to reduce the loss of power in the battery storage and release process. On the other hand, the power of the electric drive system changes in real time during vehicle driving, especially in urban conditions, where the vehicle frequently accelerates and decelerates, and the power of the electric drive system fluctuates greatly. If the power generation of the range extender is allowed to completely follow the power change of the electric drive system, the engine speed and torque will fluctuate greatly, and the instantaneous fuel consumption, emissions and NVH of the engine will deteriorate. Therefore, for extended-range hybrid vehicles, the control of the power generation of the range extender has a great impact on the vehicle's power, fuel economy, and driving experience.

[0004] The current rule-based extended-range hybrid electric vehicle energy management strategy mainly includes single-point power control strategy, multi-point power control strategy, and power following control strategy. The single-point power control strategy is that the range extender operates at a specified single operating point, which will cause the battery to have a large charging and discharging power loss; the multi-point power control strategy is that the range extender operates at several specified operating points based on the power required by the vehicle. When the range extender switches between these operating points, the engine has a large transient fuel consumption loss and the vehicle NVH is poor. The power following control strategy is that the range extender's power generation power follows the power fluctuations required by the vehicle, reducing the battery's charging and discharging losses. When the power required by the vehicle changes drastically, the engine speed / torque will fluctuate greatly, reducing the fuel economy of the vehicle. Summary of the invention

[0005] In view of this, the purpose of the present application is to provide a range extender energy management method, device, equipment and medium, which effectively solves the defects of the existing range extender energy management strategy and thus affects the overall performance of the vehicle.

[0006] In a first aspect, an embodiment of the present application provides a range extender energy management method, applicable to a vehicle, the method comprising:

[0007] The vehicle driving demand mechanical power is calculated based on the acquired accelerator pedal depth when the vehicle is driven, and the vehicle driving demand electric power is obtained based on the vehicle driving demand mechanical power, the preset driving efficiency of the electric drive assembly and the electric power of the vehicle accessories;

[0008] Processing the power generation range of the range extender to obtain the power generation sequence of the range extender and the corresponding minimum fuel consumption power sequence, so as to obtain the battery net power sequence and the corresponding battery total power sequence based on the power generation sequence of the range extender and the required electric power of the vehicle;

[0009] Calculating the power generation power sequence of the range extender to obtain the corresponding power fluctuation penalty value sequence, so as to obtain the power generation target value of the range extender based on the power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender; the battery equivalent energy consumption sequence is obtained based on the total battery power sequence and the oil-to-electricity conversion equivalent factor;

[0010] The range extender power generation power in the range extender power generation power sequence is calculated based on the range extender power generation target model to obtain a corresponding range extender power generation target value, so as to screen out an optimal power generation target value for the range extender, and control the speed and torque of the engine of the vehicle based on the optimal power generation target value for the range extender.

[0011] In combination with the first aspect, an embodiment of the present application provides a first possible implementation of the first aspect, wherein the power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender are processed based on the range extender power generation target model to obtain the range extender power generation target value, including:

[0012] Input the calculated power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender into the preset power generation target model of the range extender;

[0013] The range extender power generation target model processes the power fluctuation penalty value sequence, the battery equivalent energy consumption sequence, and the range extender minimum fuel consumption power sequence to obtain the range extender power generation target value.

[0014] In combination with the first aspect, an embodiment of the present application provides a second possible implementation of the first aspect, wherein the specific step of calculating the power fluctuation penalty value sequence of the range extender includes:

[0015] Calculate the absolute value sequence of the difference between the range extender power generation sequence at this moment and the range extender actual power generation sequence at the previous moment;

[0016] The absolute value sequence and the preset power fluctuation penalty factor of the range extender are integrated to obtain a power fluctuation penalty value sequence of the range extender.

[0017] In combination with the first aspect, the embodiment of the present application provides a third possible implementation of the first aspect, wherein the processing of the power generation range of the range extender to obtain the power generation power sequence of the range extender and the corresponding minimum fuel consumption power sequence includes:

[0018] A range extender minimum fuel consumption rate sequence is calculated based on the range extender power generation sequence, and sent to a range extender minimum fuel consumption power model;

[0019] The range extender minimum fuel consumption power model processes the range extender minimum fuel consumption rate sequence based on a preset fuel lower calorific value to obtain a range extender minimum fuel consumption power sequence.

[0020] In combination with the first aspect, the embodiment of the present application provides a fourth possible implementation of the first aspect, wherein the step of calculating the range extender minimum fuel consumption rate sequence based on the range extender power generation sequence and sending the sequence to the range extender minimum fuel consumption power model includes:

[0021] Discrete different powers of the range extender to establish a power generation sequence of the range extender based on the different powers of the discretized range extender;

[0022] The range extender power generation sequence is processed to obtain a range extender minimum specific fuel consumption sequence, so as to obtain a range extender minimum fuel consumption rate sequence based on the range extender power generation sequence and the range extender minimum specific fuel consumption sequence.

[0023] In combination with the first aspect, the embodiment of the present application provides a fifth possible implementation of the first aspect, wherein the specific steps of calculating the battery equivalent energy consumption sequence based on the battery's oil-to-electricity conversion equivalent factor and the battery total power sequence include:

[0024] Calculate the battery's oil-to-electricity conversion equivalent factor based on the battery's state of charge;

[0025] The battery equivalent energy consumption sequence is obtained by combining the oil-to-electricity conversion equivalent factor of the battery with the battery total power sequence.

[0026] In combination with the first aspect, the embodiment of the present application provides a sixth possible implementation of the first aspect, wherein the range extender power generation in the range extender power generation sequence is calculated based on the range extender power generation target model to obtain a corresponding range extender power generation target value, so as to screen out an optimal power generation target value for the range extender, and control the speed and torque of the engine of the vehicle based on the optimal power generation target value for the range extender, including:

[0027] Taking the range extender power generation power in the range extender power generation power sequence as the control scalar, obtaining the range extender power generation target value calculated by the range extender power generation target model;

[0028] Based on the obtained multiple range extender power generation target values, screening is performed to obtain the optimal power generation target value of the range extender.

[0029] In a second aspect, an embodiment of the present application further provides a range extender energy management device, the device comprising:

[0030] An acquisition module, used to calculate based on the acquired accelerator pedaling depth when the vehicle is driven, to obtain the vehicle's required driving mechanical power, and to obtain the vehicle's required driving electric power based on the vehicle's required driving mechanical power, the preset driving efficiency of the electric drive assembly, and the electric power of the vehicle accessories;

[0031] A processing module, used to process the power generation range of the range extender, obtain the power generation sequence of the range extender and the corresponding minimum fuel consumption power sequence, and obtain the battery net power sequence and the corresponding battery total power sequence based on the power generation sequence of the range extender and the required electric power of the vehicle;

[0032] A calculation module, used to calculate the power generation sequence of the range extender, obtain the corresponding power fluctuation penalty value sequence, and obtain the power generation target value of the range extender based on the power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender; the battery equivalent energy consumption sequence is obtained based on the total battery power sequence and the oil-to-electricity conversion equivalent factor;

[0033] A control module is used to calculate the range extender power generation power in the range extender power generation power sequence based on the range extender power generation target model to obtain a corresponding range extender power generation target value, so as to screen out an optimal power generation target value for the range extender, and control the speed and torque of the engine of the vehicle based on the optimal power generation target value for the range extender.

[0034] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and when the machine-readable instructions are executed by the processor, any step of a range extender energy management method is performed.

[0035] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of any one of the range extender energy management methods are executed.

[0036] A range extender energy management method provided in an embodiment of the present application is applicable to a vehicle. The method first calculates the mechanical power required for driving the vehicle based on the depth of the accelerator pedal being pressed when the vehicle is driven, and obtains the vehicle's required electric power based on the vehicle's required mechanical power, the driving efficiency of the preset electric drive assembly, and the electric power of the vehicle accessories; secondly, the power generation power range of the range extender is processed to obtain the range extender power generation power sequence and the corresponding minimum fuel consumption power sequence, and obtains the battery net power sequence and the corresponding battery total power sequence based on the range extender power generation power sequence and the vehicle's required electric power; then, the range extender power generation power sequence is calculated to obtain the corresponding power fluctuation penalty value sequence, and the range extender power fluctuation penalty value sequence and the battery equivalent power sequence are calculated based on the range extender power fluctuation penalty value sequence and the battery equivalent power sequence. The range extender power generation target value is obtained based on the energy consumption sequence and the minimum fuel consumption power sequence of the range extender; the battery equivalent energy consumption sequence is obtained based on the total battery power sequence and the oil-electric conversion equivalent factor; finally, the range extender power generation power in the range extender power generation power sequence is calculated based on the range extender power generation target model to obtain the corresponding range extender power generation target value, so as to screen out the optimal power generation target value of the range extender, and control the engine speed and torque of the vehicle based on the optimal power generation target value of the range extender, thereby ensuring the NVH characteristic performance of the whole vehicle when the range extender switches at the operating point, solving the defects of the existing range extender energy management strategy, thereby affecting the overall performance of the vehicle, and ensuring that the engine speed / torque of the vehicle does not fluctuate greatly, thereby ensuring the fuel economy of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic flow chart of a range extender energy management method provided in an embodiment of the present application is shown;

[0039] Figure 2 A structural schematic diagram of a first range extender energy management method provided in an embodiment of the present application is shown;

[0040] Figure 3 A relationship diagram between the power generation power, torque and rotation speed of the range extender provided in an embodiment of the present application is shown;

[0041] Figure 4 A schematic structural diagram of a first range extender energy management device provided in an embodiment of the present application is shown;

[0042] Figure 5 A schematic structural diagram of a first electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0043] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0044] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0045] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0046] The current rule-based extended-range hybrid electric vehicle energy management strategy mainly includes single-point power control strategy, multi-point power control strategy, and power following control strategy. The single-point power control strategy is that the range extender operates at a specified single operating point, which will cause the battery to have a large charge and discharge power loss; the multi-point power control strategy is based on the size of the vehicle's required power, and the range extender operates at several specified operating points. When the range extender switches between these operating points, the engine's transient fuel consumption loss is large and the vehicle's NVH is poor. The power following control strategy is that the range extender's power generation power follows the fluctuations in the vehicle's required power, reducing the battery's charge and discharge losses. When the vehicle's required power changes drastically, the engine speed / torque will fluctuate greatly, reducing the vehicle's fuel economy.

[0047] Based on this, the embodiments of the present application provide a range extender energy management method, device, equipment and medium, which are described below through embodiments.

[0048] Example 1

[0049] To facilitate understanding of this embodiment, a range extender energy management method disclosed in the embodiment of this application is first described in detail. Figure 1 A flow chart of a range extender energy management method is shown in FIG. Figure 2 The figure shows a schematic diagram of a range extender energy management method. The present application provides a range extender energy management method, which is applicable to a vehicle. The method includes:

[0050] S101, calculating based on the acquired accelerator pedaling depth when the vehicle is driven, obtaining the vehicle's required driving mechanical power, and obtaining the vehicle's required driving electric power based on the vehicle's required driving mechanical power, a preset driving efficiency of the electric drive assembly, and the electric power of the vehicle's accessories;

[0051] S102, processing the power generation range of the range extender to obtain a power generation sequence of the range extender and a corresponding minimum fuel consumption power sequence, and obtaining a battery net power sequence and a corresponding battery total power sequence based on the power generation sequence of the range extender and the required electric power of the vehicle;

[0052] S103, calculating the power generation power sequence of the range extender to obtain the corresponding power fluctuation penalty value sequence, and obtaining the power generation target value of the range extender based on the power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender; the battery equivalent energy consumption sequence is obtained based on the total battery power sequence and the oil-to-electricity conversion equivalent factor;

[0053] S104, calculating the range extender power generation power in the range extender power generation power sequence based on the range extender power generation target model to obtain a corresponding range extender power generation target value, so as to screen out an optimal power generation target value for the range extender, and controlling the speed and torque of the engine of the vehicle based on the optimal power generation target value for the range extender.

[0054] In the present application, the term "range-extended hybrid electric vehicle" is used instead of "vehicle", that is, the vehicle in the present application is an extended-range hybrid electric vehicle.

[0055] In step S101, various sensors are installed in the vehicle to detect relevant parameters of various devices on the vehicle. Other mature technologies applied on the vehicle can also be used to detect relevant parameters of various devices on the vehicle. In the present application, after the vehicle is started, the motor assembly, vehicle accessories, range extender and throttle on the vehicle are detected based on various sensors on the vehicle, and the output power of the motor assembly, the electric power of the vehicle accessories, the power of the range extender and the depth of the driver's accelerator when driving the vehicle are detected. The vehicle accessories refer to the sum of auxiliary function devices installed on the vehicle body, which roughly include low-voltage loads and high-voltage loads of the whole vehicle. The low-voltage loads of the whole vehicle include lighting, controller power supply, electronic fans, electronic water pumps, etc., and the high-voltage loads of the whole vehicle include electric The electric steering pump, electric air pump, electric defrost, etc. are calculated based on the output power of the vehicle's motor assembly, the electric power of the vehicle's accessories, the power of the range extender and the depth of the driver's accelerator when driving the vehicle, and the driving efficiency of the electric drive assembly and the mechanical power required for driving the vehicle are obtained respectively. That is, the mechanical power required for driving the vehicle is obtained by calculating the depth of the driver's accelerator when driving the vehicle, and the electric power required for driving the vehicle is obtained based on the mechanical power required for driving the vehicle, the driving efficiency of the electric drive assembly and the electric power of the vehicle's accessories, wherein the driving efficiency of the electric drive assembly and the electric power of the vehicle's accessories are preset and do not need to be calculated; the electric power required for driving the vehicle needs to be provided by the range extender and the battery, so the electric power required for driving the vehicle is the sum of the range extender power and the battery power.

[0056] In step S102, in order to enable the range extender to meet different usage scenarios and requirements, and meet the power requirements under different driving conditions, such as low speed or high speed or extreme conditions, or to adapt to different vehicle models or weights, such as large SUVs or MPVs, may require a larger power range extender to meet their power requirements. In order to improve the driving experience, the range extender needs to provide high power, so the power generation value of the range extender on the vehicle can be output from 0 to the maximum value. Now, the different powers of the range extender are processed to obtain the range extender power generation sequence, and the minimum fuel consumption power sequence of the range extender is obtained based on the range extender power generation sequence. Since the power of the range extender is different, the power that the battery needs to provide is also different. Then, the range extender power generation sequence and the vehicle driving demand power are calculated again to obtain a battery net power sequence. The battery net power sequence is the net power that the battery needs to provide when assisting the range extender. The battery total power sequence P bat,total Based on the battery net power sequence P bat,net And the corresponding internal resistance power consumption sequence P bat,res The battery net power sequence P is calculated to obtain the total power that the battery-assisted range extender needs to provide. bat,net is based on the vehicle's driving demand electric power P dem and the range extender power sequence P APU Calculate and express it with formula (1):

[0057] P bat,net =[0,P dem -P 1,APU ,P dem –P 2,APU ,P dem –P 3,APU ,…P dem –P N,APU ] (1)

[0058] The battery internal resistance power consumption sequence is calculated based on the battery internal resistance R and the open circuit voltage Voc obtained by the open circuit voltage method, and is expressed by formula (2):

[0059]

[0060] Then the total battery power sequence P bat,total =P bat,net +P bat,res .

[0061] In the specific implementation process of step S102, there is an embodiment in which the processing of the power generation range of the range extender to obtain the power generation power sequence of the range extender and the corresponding minimum fuel consumption power sequence includes:

[0062] S1021. Calculate a range extender minimum fuel consumption rate sequence based on the range extender power generation sequence, and send the sequence to a range extender minimum fuel consumption power model;

[0063] S1022: The range extender minimum fuel consumption power model processes the range extender minimum fuel consumption rate sequence based on a preset lower calorific value of the fuel to obtain a range extender minimum fuel consumption power sequence.

[0064] In steps S1021-S1022, the range extender minimum fuel consumption power sequence P is calculated based on the calculated range extender power sequence. fuel,APU The range extender minimum fuel consumption power sequence is P fuel,APU Indicated in g / h, the range extender's minimum fuel consumption power sequence P fuel,APU Input into the range extender minimum fuel consumption power model, the range extender minimum fuel consumption power model is expressed by formula (3):

[0065] P fuel,APU =Hu*FC APU / 3600 (3)

[0066] Wherein, Hu is the lower calorific value of fuel, which refers to the heat generated by unit mass of fuel when it is completely burned, in kJ / g, which is pre-stored and can be called when the range extender minimum fuel consumption power model is used. Then the range extender minimum fuel consumption power sequence FC APU By inputting it into the range extender minimum fuel consumption power model, the range extender minimum fuel consumption power sequence can be calculated.

[0067] In the specific implementation process of step S1021, there is an embodiment in which: the range extender minimum fuel consumption rate sequence is calculated based on the range extender power generation sequence, and sent to the range extender minimum fuel consumption power model, including:

[0068] S10211. Discrete different powers of the range extender to establish a power generation power sequence of the range extender based on the different powers of the discretized range extender;

[0069] S10212. Process the range extender power generation sequence to obtain a range extender minimum specific fuel consumption sequence, so as to obtain a range extender minimum fuel consumption rate sequence based on the range extender power generation sequence and the range extender minimum specific fuel consumption sequence.

[0070] In steps S10211-S10212, the different powers of the range extender are first sorted in ascending order to obtain a sorting sequence from 0 to the maximum power generation power, and the sorting sequence from 0 to the maximum power generation power is discretized to obtain N discrete power generation points, so as to establish a range extender power generation sequence based on the N discrete power generation points. The range extender power generation sequence is represented by P APU Indicates that the range extender power generation sequence P APU The unit is kw, which is expressed by formula (4):

[0071] P APU = [0, P 1,APU , P 2,APU , P 3,APU , … P N,APU ] (4)

[0072] Where P N,APU is the maximum power generation of the range extender, and for the range extender power generation sequence P APU The minimum specific fuel consumption corresponding to the power generation of multiple range extenders in the range extender is collected to obtain the minimum specific fuel consumption sequence of the range extender. The unit of the minimum specific fuel consumption is g / kwh. The specific fuel consumption can be obtained based on the universal characteristics of the engine and the efficiency map of the generator. The minimum specific fuel consumption sequence of the range extender is expressed by formula (5):

[0073] BSFC APU = [0, bsfc1, bsfc2, … bsfc N ] (5)

[0074] Among them, BSFC APU It is represented as the minimum specific fuel consumption sequence of the range extender, and the power generation sequence P of the range extender is APU The lowest specific fuel consumption sequence BSFC with range extender APU Based on formula (6), the minimum fuel consumption rate sequence FC of the range extender is obtained: APU :

[0075] FC APU = P APU * BSFC APU (6).

[0076] In step S03, in order to calculate the influence of the range extender power change on the NVH characteristics of the vehicle, it is necessary to obtain the range extender power sequence P based on the different power processing of the range extender. APUCalculation is performed to obtain a power fluctuation penalty value sequence corresponding to the range extender when power fluctuation occurs, so as to obtain a range extender power generation target value based on the power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender; that is, the range extender power generation target value is the target value for achieving energy management of the range extender, and the range extender power generation target value can best guarantee the NVH characteristics of the vehicle. The battery is a device that provides power to the vehicle together with the range extender, so the battery equivalent energy consumption sequence will also have a certain impact on the range extender power generation target value, so the battery equivalent energy consumption sequence needs to be calculated.

[0077] In the specific implementation process of step S103, there is an embodiment in which the power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender are processed based on the range extender power generation target model to obtain the range extender power generation target value, including:

[0078] S10311. Inputting the calculated power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender into a preset power generation target model of the range extender;

[0079] S10312. The range extender power generation target model processes the power fluctuation penalty value sequence, the battery equivalent energy consumption sequence, and the range extender minimum fuel consumption power sequence to obtain the range extender power generation target value.

[0080] In steps S10311-S10312, the power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender calculated respectively are input into the preset range extender power generation target model, where the power fluctuation penalty value sequence of the range extender is represented by P var The minimum fuel consumption power sequence of the range extender is represented by P fuel,APU Based on the above, the range extender power generation target model is expressed by formula (7):

[0081] H=P fuel,APU +Eq*P bat,total +P var (7)

[0082] Where H is the target power generation value of the range extender, Eq is the oil-to-electricity conversion equivalent factor of the battery, and P bat,total is the total battery power sequence, Eq*P bat,total is the battery equivalent energy consumption sequence. Based on the range extender power generation target model expressed by formula (7), the range extender power fluctuation penalty value sequence, the battery equivalent energy consumption sequence, and the range extender minimum fuel consumption power sequence are calculated to obtain the range extender power generation target value.

[0083] In the specific implementation process of step S10311, there is an embodiment in which the specific steps of calculating the power fluctuation penalty value sequence of the range extender include:

[0084] S103111. Calculate the absolute value sequence of the difference between the range extender power generation sequence at this moment and the range extender actual power generation sequence at the previous moment;

[0085] S103112. Integrate the absolute value sequence and the preset power fluctuation penalty factor of the range extender to obtain a power fluctuation penalty value sequence of the range extender.

[0086] In steps S103111-S103112, the actual power generation of the range extender of the vehicle during driving is processed, that is, the power generation of the range extender of the vehicle during driving is obtained, and the absolute value sequence of the difference between the power generation in the power generation sequence of the range extender at this moment and the actual power generation of the range extender at the previous moment is calculated. This absolute value sequence represents the offset of the power generation of the range extender compared with the actual power at the previous moment. For example, the power generation sequence of the range extender is [0, 1, 2, ..., 100, 101, ... 200], and the actual power generation at the previous moment is 100kw, then the power difference sequence is [-100, -99, -98, ..., 0, 1, ... 100]. The absolute value sequence can be obtained by performing absolute value processing on the power difference sequence, and then the preset power fluctuation penalty factor is called based on the offset of the absolute value sequence. The power fluctuation penalty factor is expressed by K var Indicates that the power fluctuation penalty factor K var It can be obtained by calibration, when the power fluctuation penalty factor K var The larger the value, the larger the penalty value corresponding to the unit power fluctuation, indicating that the engine power fluctuation is less desirable, and the absolute value sequence is integrated with the preset power fluctuation penalty factor of the range extender to obtain the power fluctuation penalty value sequence P of the range extender. var , that is, the power fluctuation penalty value sequence P of the range extender is ensured by the power fluctuation penalty factor var The accuracy of the power fluctuation penalty value sequence P of the range extender var It is expressed by formula (8):

[0087] P var =K var *abs(P APU -P APU,act ) (8)

[0088] Among them, P APU,act is the actual power generation of the range extender at the previous moment, and abs(PAPU-PAPU,act) is the absolute value sequence of the difference between the power generation sequence of the range extender and the actual power generation sequence of the range extender at the previous moment.

[0089] In the specific implementation process of step S103, there is an embodiment in which the battery equivalent energy consumption sequence is calculated by the battery oil-to-electricity conversion equivalent factor and the battery total power sequence, including:

[0090] S10321. Calculate the oil-to-electricity conversion equivalent factor of the battery based on the state of charge of the battery;

[0091] S10322. Combining the oil-to-electricity conversion equivalent factor of the battery with the total power sequence of the battery to obtain a battery equivalent energy consumption sequence.

[0092] In steps S10321-S10322, the state of charge of the battery is represented by SOC. There are many methods for obtaining the state of charge SOC of the battery. Here, the state of charge SOC of the battery can be obtained by communicating with the BMS module of the battery, and the oil-to-electricity conversion equivalent factor Eq is obtained by formula (9):

[0093] Eq = f(SOC) (9);

[0094] Among them, the oil-to-electric conversion equivalent factor Eq represents the fuel power value equivalent to the electric energy per unit power. The larger the oil-to-electric conversion equivalent factor Eq is, the greater the fuel consumption power equivalent to the battery output unit power is. This value changes with the SOC. The lower the SOC is, the larger the equivalent factor is. At this time, from the perspective of total equivalent energy, it is more inclined to increase the power generation of the range extender to charge the battery; the higher the SOC is, the smaller the equivalent factor is. At this time, it is more inclined to discharge the battery, reduce the power generation of the range extender or shut down. Eq can be calibrated according to the SOC, or the PID can be used to adjust Eq so that the SOC tends to the set target charge state SOC. The battery equivalent energy consumption sequence Eq*P is obtained by multiplying the oil-to-electric conversion equivalent factor of the battery with the total power sequence of the battery. bat,total .

[0095] In step S104, since the range extender power generation sequence has a plurality of different range extender power generation powers, that is, the control variable method is selected, and each range extender power generation power in the range extender power generation sequence is calculated to obtain the range extender power generation target value corresponding to the range extender power generation power, and the minimum range extender power generation target value is selected as the range extender optimal power generation power, and the range extender optimal power generation power is also the best power generation power value of the range extender during the driving process of the vehicle, and the speed and torque of the engine of the vehicle are controlled based on the range extender optimal power generation power, so that the vehicle reaches the range extender optimal power generation power at the controlled speed and torque, thereby reducing the transient fuel consumption of the engine power fluctuation, improving the engine emission and NVH characteristics, and ensuring the driving effect of the vehicle.

[0096] In the specific implementation process of step S104, there is an embodiment in which: the range extender power generation in the range extender power generation sequence is calculated based on the range extender power generation target model to obtain a corresponding range extender power generation target value, so as to screen out the range extender optimal power generation target value, and the speed and torque of the engine of the vehicle are controlled based on the range extender optimal power generation target value, including:

[0097] S1041, taking the range extender power generation power in the range extender power generation power sequence as a control scalar, obtaining a range extender power generation target value calculated by the range extender power generation target model;

[0098] S1042: Screening is performed based on the obtained multiple range extender power generation target values ​​to obtain an optimal power generation target value for the range extender.

[0099] In steps S1041-S1042, the range extender power generation sequence has a plurality of different range extender power generation powers, so the control variable method is used to change the range extender power generation power to obtain different range extender power generation target values, and the plurality of range extender power generation target values ​​are sorted to obtain the minimum range extender power generation target value, and the minimum range extender power generation target value is used as the range extender optimal power generation target value, and the optimal range extender power generation power at the range extender optimal power generation target value is obtained by formula (10):

[0100] P APU,opt =argmin(H) (10).

[0101] like Figure 3 As shown, it is the engine universal characteristic diagram, the ordinate is the engine torque, the abscissa is the engine speed, the gray curve is the e-line curve of the range extender, that is, the minimum fuel consumption point curve under the power generation power of each range extender, and the intersection of the power line and the e-line curve is the corresponding torque and speed of the generator, that is, the optimal generator speed and torque can be obtained according to this curve.

[0102] Example 2

[0103] The present application also provides a range extender energy management device, such as Figure 4 The block diagram of a range extender energy management device is shown. The functions implemented by the range extender energy management device correspond to the steps of executing the range extender energy management method on the terminal device. The device can be understood as a component of a server including a processor. A range extender energy management device, the device includes:

[0104] The acquisition module 401 is used to calculate the required mechanical power of the vehicle based on the acquired depth of the accelerator pedal when the vehicle is driven, and obtain the required electric power of the vehicle based on the required mechanical power of the vehicle, the preset driving efficiency of the electric drive assembly and the electric power of the vehicle accessories;

[0105] The processing module 402 is used to process the power generation range of the range extender, obtain the power generation sequence of the range extender and the corresponding minimum fuel consumption power sequence, and obtain the battery net power sequence and the corresponding battery total power sequence based on the power generation sequence of the range extender and the required electric power of the vehicle;

[0106] The calculation module 403 is used to calculate the power generation sequence of the range extender to obtain the corresponding power fluctuation penalty value sequence, so as to obtain the power generation target value of the range extender based on the power fluctuation penalty value sequence of the range extender, the total power sequence of the battery, and the minimum fuel consumption power sequence of the range extender; the battery equivalent energy consumption sequence is calculated by the oil-to-electricity conversion equivalent factor of the battery and the total power sequence of the battery;

[0107] The control module 404 is used to calculate the range extender power generation power in the range extender power generation power sequence based on the range extender power generation target model to obtain the corresponding range extender power generation target value, so as to screen out the range extender optimal power generation target value, and control the speed and torque of the vehicle's engine based on the range extender optimal power generation target value.

[0108] In a feasible implementation manner, the computing module includes:

[0109] A first input module is used to input the calculated power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender into a preset power generation target model of the range extender;

[0110] The first processing module is used for the range extender power generation target model to process the power fluctuation penalty value sequence, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender to obtain the range extender power generation target value.

[0111] In a feasible implementation manner, the calculation module further includes:

[0112] A first calculation module is used to calculate an absolute value sequence of the difference between a power generation sequence of the range extender at this moment and an actual power generation sequence of the range extender at a previous moment;

[0113] The integration module is used to integrate the absolute value sequence with a preset power fluctuation penalty factor of the range extender to obtain a power fluctuation penalty value sequence of the range extender.

[0114] In a feasible implementation manner, the processing module includes:

[0115] A second calculation module, configured to calculate a minimum fuel consumption rate sequence of the range extender based on the range extender power generation sequence, and send the sequence to a minimum fuel consumption power model of the range extender;

[0116] The second processing module is used for the range extender minimum fuel consumption power model to process the range extender minimum fuel consumption rate sequence based on a preset fuel lower calorific value to obtain the range extender minimum fuel consumption power sequence.

[0117] In a feasible implementation manner, the processing module further includes:

[0118] A discrete module, used for discretely distributing different powers of the range extender, so as to establish a power generation sequence of the range extender based on the discrete different powers of the range extender;

[0119] The third processing module is used to process the range extender power generation sequence to obtain the range extender minimum specific fuel consumption sequence, so as to obtain the range extender minimum fuel consumption rate sequence based on the range extender power generation sequence and the range extender minimum specific fuel consumption sequence.

[0120] In a feasible implementation manner, the computing module further includes:

[0121] A fourth calculation module, used to calculate the oil-to-electricity conversion equivalent factor of the battery based on the state of charge of the battery;

[0122] A combined module is used to combine the oil-to-electricity conversion equivalent factor of the battery with the total power sequence of the battery to obtain a battery equivalent energy consumption sequence; the total power sequence of the battery is calculated based on the net power sequence of the battery and the corresponding internal resistance consumption power sequence.

[0123] In a feasible implementation manner, the control module includes:

[0124] A third calculation module is used to obtain a range extender power generation target value calculated by the range extender power generation target model by taking the range extender power generation power in the range extender power generation power sequence as a control scalar;

[0125] The screening module is used to screen the multiple range extender power generation target values ​​obtained to obtain the optimal power generation target value of the range extender.

[0126] Example 3

[0127] The present application also provides an electronic device, such as Figure 5 As shown, it includes: a processor 501, a memory 502 and a bus 503, the memory 502 stores machine-readable instructions executable by the processor 501, when the electronic device is running, the processor 501 communicates with the memory 502 through the bus 503, and when the machine-readable instructions are executed by the processor 501, any one of the steps of the range extender energy management method described above is performed.

[0128] Example 4

[0129] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of any one of the range extender energy management methods are executed.

[0130] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the method embodiment, and will not be repeated in this application. In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0131] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0132] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0133] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a platform server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0134] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A range extender energy management method, characterized in that: Applicable to a vehicle, the method comprises: The vehicle driving demand mechanical power is calculated based on the acquired accelerator pedal depth when the vehicle is driven, and the vehicle driving demand electric power is obtained based on the vehicle driving demand mechanical power, the preset driving efficiency of the electric drive assembly and the electric power of the vehicle accessories; Processing the power generation range of the range extender to obtain the power generation sequence of the range extender and the corresponding minimum fuel consumption power sequence, so as to obtain the battery net power sequence and the corresponding battery total power sequence based on the power generation sequence of the range extender and the required electric power of the vehicle; Calculating the power generation power sequence of the range extender to obtain the corresponding power fluctuation penalty value sequence, and processing the power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender based on the range extender power generation target model to obtain the range extender power generation target value; the battery equivalent energy consumption sequence is obtained based on the total battery power sequence and the oil-to-electricity conversion equivalent factor; The range extender power generation power in the range extender power generation power sequence is calculated based on the range extender power generation target model to obtain a corresponding range extender power generation target value, so as to screen out an optimal power generation target value for the range extender, and control the speed and torque of the engine of the vehicle based on the optimal power generation target value for the range extender.

2. The method according to claim 1, characterized in that The power generation target value of the range extender is obtained by processing the power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender based on the range extender power generation target model, including: Input the calculated power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender into the preset power generation target model of the range extender; The range extender power generation target model processes the power fluctuation penalty value sequence, the battery equivalent energy consumption sequence, and the range extender minimum fuel consumption power sequence to obtain the range extender power generation target value.

3. The method according to claim 2, characterized in that The specific steps of calculating and obtaining the power fluctuation penalty value sequence of the range extender include: Calculate the absolute value sequence of the difference between the range extender power generation sequence at this moment and the range extender actual power generation sequence at the previous moment; The absolute value sequence and the preset power fluctuation penalty factor of the range extender are integrated to obtain a power fluctuation penalty value sequence of the range extender.

4. The method according to claim 1, characterized in that: The processing of the power generation range of the range extender to obtain the power generation sequence of the range extender and the corresponding minimum fuel consumption power sequence includes: A range extender minimum fuel consumption rate sequence is calculated based on the range extender power generation sequence, and sent to a range extender minimum fuel consumption power model; The range extender minimum fuel consumption power model processes the range extender minimum fuel consumption rate sequence based on a preset fuel lower calorific value to obtain a range extender minimum fuel consumption power sequence.

5. The method according to claim 4, characterized in that The step of calculating the range extender minimum fuel consumption rate sequence based on the range extender power generation sequence and sending the sequence to the range extender minimum fuel consumption power model includes: Discrete different powers of the range extender to establish a power generation sequence of the range extender based on the different powers of the discretized range extender; The range extender power generation sequence is processed to obtain a range extender minimum specific fuel consumption sequence, so as to obtain a range extender minimum fuel consumption rate sequence based on the range extender power generation sequence and the range extender minimum specific fuel consumption sequence.

6. The method according to claim 1, characterized in that The specific steps of calculating the battery equivalent energy consumption sequence based on the battery's oil-to-electricity conversion equivalent factor and the battery's total power sequence include: Calculate the battery's oil-to-electricity conversion equivalent factor based on the battery's state of charge; The battery equivalent energy consumption sequence is obtained by combining the oil-to-electricity conversion equivalent factor of the battery with the battery total power sequence.

7. The method according to claim 1, characterized in that The step of calculating the range extender power generation power in the range extender power generation power sequence based on the range extender power generation target model to obtain a corresponding range extender power generation target value, so as to screen out an optimal power generation target value for the range extender, and controlling the speed and torque of the engine of the vehicle based on the optimal power generation target value for the range extender, comprises: Taking the range extender power generation power in the range extender power generation power sequence as the control scalar, obtaining the range extender power generation target value calculated by the range extender power generation target model; Screening is performed based on the obtained power generation target value of the range extender to obtain the optimal power generation target value of the range extender.

8. A range extender energy management device, characterized in that: The device comprises: An acquisition module, used to calculate based on the acquired accelerator pedaling depth when the vehicle is driven, to obtain the vehicle's required driving mechanical power, and to obtain the vehicle's required driving electric power based on the vehicle's required driving mechanical power, the preset driving efficiency of the electric drive assembly, and the electric power of the vehicle accessories; A processing module, used to process the power generation range of the range extender, obtain the power generation sequence of the range extender and the corresponding minimum fuel consumption power sequence, and obtain the battery net power sequence and the corresponding battery total power sequence based on the power generation sequence of the range extender and the required electric power of the vehicle; A calculation module, used to calculate the power generation sequence of the range extender, obtain the corresponding power fluctuation penalty value sequence, and obtain the power generation target value of the range extender based on the power fluctuation penalty value sequence of the range extender, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the range extender; the battery equivalent energy consumption sequence is obtained based on the total battery power sequence and the oil-to-electricity conversion equivalent factor; A control module is used to calculate the range extender power generation power in the range extender power generation power sequence based on the range extender power generation target model to obtain a corresponding range extender power generation target value, so as to screen out an optimal power generation target value for the range extender, and control the speed and torque of the engine of the vehicle based on the optimal power generation target value for the range extender.

9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate via the bus, and when the machine-readable instructions are executed by the processor, the steps of a range extender energy management method as described in any one of claims 1 to 7 are performed.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the range extender energy management method as claimed in any one of claims 1 to 7 are executed.

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