A range extender energy management method, device, equipment and medium

Abstract

The application provides a range extender energy management method, device, equipment and medium, effectively solves the defects of the existing range extender energy management strategy, and further affects the overall performance of the vehicle. The method comprises the following steps: calculating the driving demand mechanical power of the vehicle based on the depth of the accelerator being stepped on, obtaining the driving demand electrical power of the vehicle based on the driving demand mechanical power of the vehicle; processing the power generation power range of the range extender to obtain the power generation power sequence of the range extender and the corresponding minimum fuel consumption power sequence, and calculating the battery net power sequence and the corresponding battery total power sequence; calculating the power generation power sequence of the range extender to obtain the corresponding power fluctuation penalty value sequence, obtaining the optimal power generation power of the range extender based on the range extender power generation target model, controlling the speed and torque of the engine, and ensuring 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, in particular to a range extender energy management method, device, equipment and medium. BACKGROUND

[0002] The range-extender hybrid vehicle is driven by an electric motor, and has good power performance, responsiveness and driving smoothness. When the power battery has sufficient power, the power battery alone supplies power to the electric drive system; when the power battery has low power, the range extender starts to generate power. The range extender is a power generation unit composed of an engine and an ISG motor, and the range extender and the electric drive system are not mechanically connected, so the engine speed / torque and the wheel speed / torque are completely decoupled, and the engine can always operate in the high-efficiency zone, thereby having 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 the vehicle accessories (such as electronic water pumps, electronic fans, etc.), the remaining electric energy 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 the vehicle accessories (such as electronic water pumps, electronic fans, etc.), the electric energy stored in the power battery is released. Due to the existence of the battery internal resistance, the storage and release process of the electric energy will cause energy loss. Therefore, the electric energy generated by the range extender should be used for driving as much as possible to reduce the loss of the electric energy in the storage and release process in the battery. On the other hand, the power of the electric drive system changes in real time during vehicle driving, especially in urban driving conditions, the vehicle frequently accelerates and decelerates, and the power of the electric drive system fluctuates greatly. If the power generation of the range extender completely follows the power change of the electric drive system, the engine speed and torque will fluctuate greatly, and the instantaneous fuel consumption, emission and NVH of the engine will be deteriorated. Therefore, for the range-extender hybrid vehicle, the control of the power generation of the range extender has a great influence on the power performance, fuel economy and driving experience of the vehicle.

[0004] The current rule-based energy management strategy of the range-extender hybrid vehicle mainly includes a single-point power control strategy, a multi-point power control strategy, and a power following control strategy. The single-point power control strategy is to operate the range extender at a specified single operating point, which will cause a large charging and discharging power loss of the battery; the multi-point power control strategy is to operate the range extender at specified operating points based on the size of the vehicle demand power. When the range extender switches among the operating points, the engine has a large transient fuel consumption loss, and the vehicle NVH is poor. The power following control strategy is to make the power generation of the range extender follow the fluctuation of the vehicle demand power, which reduces the charging and discharging loss of the battery. When the vehicle demand power changes dramatically, the engine speed / torque will fluctuate greatly, thereby reducing the fuel economy of the vehicle. SUMMARY

[0005] Therefore, the present application aims 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, thereby affecting the overall performance of the vehicle.

[0006] In a first aspect, the embodiments of the present application provide a range extender energy management method, which is suitable for a vehicle, and the method comprises:

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

[0008] The power generation range of the range extender is processed to obtain a range extender power generation sequence and a corresponding minimum fuel consumption power sequence, and the battery net power sequence and the corresponding battery total power sequence are obtained based on the range extender power generation sequence and the driving demand electrical power of the vehicle;

[0009] The range extender power generation sequence is calculated to obtain a corresponding power fluctuation penalty value sequence, and the range extender power generation target value is obtained 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 battery total power sequence and the oil-electricity conversion equivalent factor;

[0010] The range extender power generation power in the range extender power generation sequence is calculated based on the range extender power generation target model to obtain the corresponding range extender power generation target value, the optimal range extender power generation target value is screened out, and the speed and torque of the engine of the vehicle are controlled based on the optimal range extender power generation target value.

[0011] In combination with the first aspect, the embodiments of the present application provide a first possible implementation manner of the first aspect, wherein the range extender power generation target value is obtained 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 by the range extender power generation target model, comprising:

[0012] 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 are input into the preset range extender power generation target model;

[0013] The range extender power generation target model processes 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.

[0014] With reference to the first aspect, in a second possible implementation of the first aspect, the specific steps of calculating the power fluctuation penalty value sequence of the range extender include:

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

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

[0017] With reference to the first aspect, in a third possible implementation of the first aspect, the processing of the power generation range of the range extender to obtain the range extender power generation sequence and the corresponding minimum fuel consumption power sequence includes:

[0018] calculating a range extender minimum fuel consumption rate sequence based on the range extender power generation sequence and sending the range extender minimum fuel consumption rate sequence 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 low heat value to obtain a range extender minimum fuel consumption power sequence.

[0020] With reference to the first aspect, in a fourth possible implementation of the first aspect, the calculating of the range extender minimum fuel consumption rate sequence based on the range extender power generation sequence and the sending of the range extender minimum fuel consumption rate sequence to the range extender minimum fuel consumption power model include:

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

[0022] processing the range extender power generation sequence to obtain a range extender minimum specific fuel consumption sequence, and obtaining 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.

[0023] With reference to the first aspect, in a fifth possible implementation of the first aspect, the specific steps of calculating the battery equivalent energy consumption sequence based on the oil-electric conversion equivalent factor of the battery and the battery total power sequence include:

[0024] calculating the oil-electric conversion equivalent factor of the battery based on the state of charge of the battery;

[0025] obtaining the battery equivalent energy consumption sequence by combining the oil-electric conversion equivalent factor of the battery and the battery total power sequence.

[0026] With reference to the first aspect, the embodiments of the present application provide a sixth possible implementation manner of the first aspect, and the method further includes:

[0027] The engine power sequence is obtained as a control scalar, and the engine power target value calculated by the engine power target model is obtained.

[0028] The obtained multiple engine power target values are screened to obtain the optimal engine power target value.

[0029] In the second aspect, the embodiments of the present application further provide an engine energy management device, and the device includes:

[0030] The acquisition module is configured to calculate the vehicle driving demand mechanical power based on the depth of the accelerator pedal being depressed when the vehicle is driven, and obtain the vehicle driving demand electrical power based on the vehicle driving demand mechanical power, the preset driving efficiency of the electric drive assembly, and the electrical power of the vehicle accessories.

[0031] The processing module is configured to process the engine power range to obtain the engine power sequence 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 engine power sequence and the vehicle driving demand electrical power.

[0032] The calculation module is configured to calculate the engine power sequence to obtain the corresponding power fluctuation penalty value sequence, and obtain the engine power target value based on the power fluctuation penalty value sequence of the engine, the battery equivalent energy consumption sequence, and the minimum fuel consumption power sequence of the engine; the battery equivalent energy consumption sequence is obtained based on the battery total power sequence and an oil-electricity conversion equivalent factor.

[0033] The control module is configured to obtain the corresponding engine power target value based on the engine power sequence calculated by the engine power target model, screen out the optimal engine power target value, and control the speed and torque of the engine of the vehicle based on the optimal engine power target value.

[0034] In the third aspect, the embodiments of the present application further provide an electronic device, including a processor, a memory, and a bus, the memory stores machine readable instructions executable by the processor, when the electronic device is running, the processor and the memory communicate through the bus, and the machine readable instructions are executed by the processor to perform the steps of any one of the engine energy management methods.

[0035] In a fourth aspect, the embodiments of the present application further provide a computer readable storage medium, which stores a computer program. When the computer program is run by a processor, the steps of the energy management method of the range extender are executed.

[0036] The energy management method of the range extender provided by the embodiments of the present application is suitable for a vehicle. The method first calculates a driving demand mechanical power of the vehicle based on the depth of the accelerator pedal when the vehicle is driven, and obtains a driving demand electric power of the vehicle based on the driving demand mechanical power of the vehicle, a preset driving efficiency of the electric drive assembly and an electric power of the vehicle accessories. Then, the power generation range of the range extender is processed to obtain a power generation sequence of the range extender and a corresponding minimum fuel consumption power sequence. The net power sequence of the battery and the corresponding total power sequence of the battery are obtained based on the power generation sequence of the range extender and the driving demand electric power of the vehicle. The power fluctuation penalty value sequence corresponding to the power generation sequence of the range extender is calculated. The power generation target value of the range extender is obtained based on the power fluctuation penalty value sequence of the range extender, the equivalent energy consumption sequence of the battery and the minimum fuel consumption power sequence of the range extender. The power generation target value of the range extender corresponding to the power generation power of the range extender in the power generation sequence of the range extender is obtained based on the power generation target model of the range extender, so as to screen the optimal power generation target value of the range extender. The speed and torque of the engine of the vehicle are controlled based on the optimal power generation target value of the range extender, so as to ensure the NVH characteristic performance of the vehicle when the range extender switches at the working condition point. The defects of the existing energy management strategy of the range extender are solved, the overall performance of the vehicle is affected, and the speed / torque of the engine of the vehicle is not greatly fluctuated, so as to ensure the fuel economy of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0038] Figure 1 The flowchart of the energy management method of the range extender provided by the embodiments of the present application is shown;

[0039] Figure 2 The structural diagram of the first energy management method of the range extender provided by the embodiments of the present application is shown;

[0040] Figure 3 A diagram showing the relationship between the power generation of the range extender and the torque and rotational speed is shown.

[0041] Figure 4 A structural schematic diagram of the first energy management device of the range extender is shown.

[0042] Figure 5 A structural schematic diagram of the first electronic device is shown. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and superiorities of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application are only intended to illustrate and describe the present application, and should not be used to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn according to the actual proportions. The flowcharts in the present application show the operations implemented according to some embodiments of the present application. It should be understood that the operations in the flowcharts can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowcharts or one or more operations can be removed from the flowcharts under the guidance of the content in the present application by those skilled in the art.

[0044] In addition, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different 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 claimed present application, but only represents 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 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] Current rule-based energy management strategies for range-extended hybrid electric vehicles (REEVs) mainly include single-point power control, multi-point power control, and power-following control. Single-point power control operates the range extender at a single designated operating point, resulting in significant power loss during battery charging and discharging. Multi-point power control operates the range extender at several designated operating points based on the vehicle's power demand. When the range extender switches between these operating points, there is significant transient fuel consumption loss in the engine, and the vehicle's NVH (noise, vibration, and harshness) is poor. Power-following control adjusts the range extender's power output to match the vehicle's power demand, reducing battery charging and discharging losses. However, when the vehicle's power demand changes drastically, it causes large fluctuations in engine speed / torque, reducing overall fuel economy.

[0047] Based on this, embodiments of this application provide a range extender energy management method, apparatus, device, 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 this application will first be described in detail. For example... Figure 1 A flowchart of a range extender energy management method is shown below. Figure 2 The diagram shown is a structural schematic of a range extender energy management method. This application provides a range extender energy management method applicable to vehicles, the method comprising:

[0050] S101. Calculate the mechanical power required for vehicle driving based on the depth of the accelerator pedal when the vehicle is driven, and obtain the electric power required for vehicle driving based on the mechanical power required for vehicle driving, the driving efficiency of the preset electric drive assembly and the electric power of vehicle accessories.

[0051] S102. Process 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, and obtain the net battery power sequence and the corresponding total battery power sequence based on the power generation sequence of the range extender and the electric power required for vehicle driving.

[0052] S103. Calculate the power generation sequence of the range extender to obtain the corresponding power fluctuation penalty value sequence. 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, obtain the target power generation value of the range extender. The battery equivalent energy consumption sequence is obtained based on the total battery power sequence and the oil-electric conversion equivalence factor.

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

[0054] In this application, the vehicle is replaced by the range-extending hybrid electric vehicle, that is, the vehicle in this application is the range-extending hybrid electric vehicle.

[0055] In step S101, various sensors are installed in the vehicle to detect the relevant parameters of various devices on the vehicle, or other mature technologies applied to the vehicle can be used to detect the relevant parameters of various devices on the vehicle. In this application, after the vehicle is started, the motor assembly, vehicle accessories, range extender and accelerator 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 accelerator pedal of the driver when driving the vehicle are detected. The vehicle accessories refer to the sum of the auxiliary function devices installed on the vehicle body, which generally include the low-voltage load of the whole vehicle and the high-voltage load of the whole vehicle. The low-voltage load of the whole vehicle is, for example, lighting, controller power supply, electronic fan, electronic water pump, etc., and the high-voltage load of the whole vehicle is, for example, electric steering pump, electric air pump, electric defrosting, etc. Based on the obtained output power of the motor assembly, electric power of the vehicle accessories and power of the range extender and the depth of the accelerator pedal of the driver when driving the vehicle, the driving efficiency of the electric drive assembly, the mechanical power required for driving the vehicle, and the electric power required for driving the vehicle are calculated, respectively. The mechanical power required for driving the vehicle is calculated by the depth of the accelerator pedal of the driver when driving the vehicle, and the electric power required for driving the vehicle is calculated 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 accessories. The driving efficiency of the electric drive assembly and the electric power of the vehicle accessories are pre-set 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 power of the range extender and the power of the battery.

[0056] In step S102, in order to make the range extender meet different use scenarios and requirements, meet the power requirements in different driving conditions, such as low speed or high speed or extreme conditions, or adapt to different vehicle models or weights, such as large SUV or MPV which may require a range extender with larger power to meet its power requirements, in order to improve the driving experience, the range extender needs to provide large power, so the value of the power generation power of the range extender on the vehicle can be output from 0 to the maximum value, the different power of the range extender is processed to obtain the range extender power generation power sequence, and the lowest fuel consumption power sequence of the range extender is obtained based on the range extender power generation power sequence, and since the power of the range extender is different, the power required by the battery is also different, and then the range extender power generation power sequence and the vehicle driving demand electric power are operated to obtain the battery net power sequence, the battery net power sequence is the net power required by the battery when assisting the range extender, and the battery total power sequence P bat,total Based on the battery net power sequence P bat,net And the corresponding internal resistance consumption power sequence P bat,res The total power required by the battery to assist the range extender is calculated, the battery net power sequence P bat,net Is calculated based on the vehicle driving demand electric power P dem And the range extender power generation power sequence P APU , which is represented by 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 consumption power sequence is calculated based on the battery internal resistance R and the open circuit voltage Voc obtained by the open circuit voltage method, which is represented by formula (2):

[0059]

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

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

[0062] S1021, calculate the minimum fuel consumption rate sequence of the range extender based on the range extender power generation sequence, and send it to the 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 the preset low heat value of 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 fuel,APU is calculated based on the calculated range extender power generation sequence, represented by P fuel,APU , unit: g / h, the range extender minimum fuel consumption power sequence P fuel,APU is input into the range extender minimum fuel consumption power model, which is represented by formula (3):

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

[0066] Where Hu is the low heat value of fuel, which refers to the heat generated by unit mass of fuel when it is completely burned, unit: kJ / g, which is obtained by pre-storing and calling when the range extender minimum fuel consumption power model is used. The range extender minimum fuel consumption power sequence FC APU is input into the range extender minimum fuel consumption power model, and the range extender minimum fuel consumption power sequence can be calculated.

[0067] In the specific implementation process of step S1021, there is an embodiment that: 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, discretize the different powers of the range extender to establish a range extender power generation sequence based on the discretized different powers of the range extender;

[0069] S10212, process the range extender power generation sequence to obtain a range extender minimum specific fuel consumption sequence, and 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 sorted first in ascending order to obtain a sorted sequence from 0 to the maximum power generation, and the sorted sequence from 0 to the maximum power generation is discretized to obtain N discrete power generation points, and the range extender power generation sequence is established based on the N discrete power generation points, and the range extender power generation sequence is represented by P APU , the unit of the range extender power generation sequence P APU is kw, and is represented 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 the minimum specific fuel consumption sequence of the range extender is obtained by collecting the minimum specific fuel consumption corresponding to each of the multiple power generations in the range extender power generation sequence P APU , the unit of the minimum specific fuel consumption is g / kwh, and the specific fuel consumption can be obtained based on the engine universal characteristic and the efficiency Map of the generator, and the minimum specific fuel consumption sequence of the range extender is represented by formula (5):

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

[0074] where BSFC APU represents the minimum specific fuel consumption sequence of the range extender, and the range extender power generation sequence P APU and the minimum specific fuel consumption sequence BSFC APU of the range extender are processed based on formula (6) to obtain the minimum fuel consumption rate sequence FC APU of the range extender:

[0075] FC APU = P APU * BSFC APU (6)。

[0076] In step S03, in order to calculate the influence of the change of the power of the range extender on the NVH characteristics of the vehicle, the range extender power generation sequence P APUThe power fluctuation penalty value sequence corresponding to the range extender when the power fluctuation occurs is calculated, and the range extender power generation target value is obtained 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 the 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 for the vehicle together with the range extender, and therefore the battery equivalent energy consumption sequence also has a certain impact on the range extender power generation target value, and therefore the battery equivalent energy consumption sequence needs to be calculated.

[0077] In the implementation process of step S103, there is an embodiment that the range extender power generation target value 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:

[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 the preset range extender power generation target model;

[0079] S10312, the range extender power generation target model processes 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.

[0080] In steps S10311-S10312, 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 are input into the preset range extender power generation target model, wherein 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 , and based on the above, the range extender power generation target model is represented by formula (7):

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

[0082] wherein H is the range extender power generation target value, Eq is the oil-electric conversion equivalent factor of the battery, P bat,total is the total power sequence of the battery, Eq*P bat,total is the battery equivalent energy consumption sequence, and the range extender power generation target model represented by formula (7) can obtain the range extender power generation target value by calculating 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.

[0083] In a specific implementation of step S10311, one embodiment includes the following steps for calculating the power fluctuation penalty value sequence of the range extender:

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

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

[0086] In steps S103111-S103112, the actual power generation of the range extender during vehicle operation is processed. Specifically, the range extender's power generation during vehicle operation is obtained, and the absolute value sequence of the difference between the power generation at this moment and the actual power generation at the previous moment is calculated. This absolute value sequence represents the offset of the range extender's power generation compared to the actual power at the previous moment. For example, if the range extender's power generation sequence is [0, 1, 2, ..., 100, 101, ..., 200], and the actual power generation at the previous moment was 100 kW, then the power difference sequence is [-100, -99, -98, ..., 0, 1, ..., 100]. The absolute value sequence is obtained by performing absolute value processing on the power difference sequence. Then, a preset power fluctuation penalty factor is applied to this absolute value sequence based on the offset. The power fluctuation penalty factor is represented by K. var This indicates that the power fluctuation penalty factor K var The power fluctuation penalty factor K can be obtained through calibration. var The larger the value, the greater the penalty value corresponding to the unit power fluctuation, indicating a stronger desire to prevent engine power fluctuations. The absolute value sequence is then integrated with a pre-set power fluctuation penalty factor for the range extender to obtain the range extender's power fluctuation penalty value sequence P. var That is, the power fluctuation penalty value sequence P of the range extender is guaranteed by the power fluctuation penalty factor. var The accuracy of the power fluctuation penalty value sequence P of the range extender. var This can be expressed using formula (8):

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

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

[0089] In the implementation process of step S103, there is an embodiment that the specific steps for calculating the battery equivalent energy consumption sequence through the battery oil-electricity conversion equivalent factor and the battery total power sequence include:

[0090] S10321, calculate the battery oil-electricity conversion equivalent factor based on the state of charge of the battery;

[0091] S10322, obtain the battery equivalent energy consumption sequence by combining the battery oil-electricity conversion equivalent factor and the battery total power sequence.

[0092] In steps S10321-S10322, the state of charge of the battery is represented by SOC, and there are various 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-electricity conversion equivalent factor Eq can be obtained through formula (9):

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

[0094] Wherein, the oil-electricity conversion equivalent factor Eq represents the fuel power value equivalent to unit power, the larger the oil-electricity conversion equivalent factor Eq, the larger the fuel consumption power equivalent to the unit power output by the battery, and the value changes with SOC. The lower the SOC, the larger the equivalent factor, at which time from the total equivalent energy point of view, it is more inclined to increase the generator power to charge the battery; the higher the SOC, the smaller the equivalent factor, at which time it is more inclined to let the battery discharge, reduce the generator power or stop the generator. Eq can be calibrated according to SOC, or SOC can be adjusted to the target charge state SOC by PID, and the battery equivalent energy consumption sequence Eq*P can be obtained by multiplying the battery oil-electricity conversion equivalent factor and the battery total power sequence. bat,total .

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

[0096] In a specific implementation of step S104, one embodiment is as follows: The calculation of the range extender power generation in the range extender power generation sequence based on the range extender power generation target model to obtain the corresponding range extender power generation target value, thereby selecting the optimal range extender power generation target value, and controlling the vehicle's engine speed and torque based on the optimal range extender power generation target value, includes:

[0097] S1041. Using the range extender power generation in the range extender power generation sequence as the control scalar, obtain the range extender power generation target value calculated by the range extender power generation target model.

[0098] S1042. Based on the obtained multiple range extender power generation target values, the optimal power generation target value of the range extender is obtained by screening.

[0099] In steps S1041-S1042, the range extender power generation sequence contains multiple different range extender power generation values. Therefore, the control variable method is used to change the range extender power generation value to obtain different range extender power generation target values. The multiple range extender power generation target values ​​are sorted to obtain the smallest range extender power generation target value, and the smallest range extender power generation target value is taken as the optimal range extender power generation target value. The optimal range extender power generation value at the optimal range extender power generation target value is obtained using formula (10):

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

[0101] like Figure 3 As shown, this is the universal characteristic diagram of the engine. The vertical axis represents the engine torque, the horizontal axis represents the engine speed, and the gray curve represents the e-line curve of the range extender, which is the curve of the lowest fuel consumption point under the power generation of each range extender. The intersection of the power line and the e-line curve is the torque and speed of the corresponding generator. That is, the optimal generator speed and torque can be obtained from this curve.

[0102] Example 2

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

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

[0105] a processing module 402, configured to process a 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 to obtain a net power sequence of the battery and a corresponding total power sequence of the battery based on the power generation sequence of the range extender and a driving demand power of the vehicle;

[0106] a calculation module 403, configured to calculate the power generation sequence of the range extender to obtain a corresponding power fluctuation penalty value sequence, and to obtain a 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 equivalent energy consumption sequence of the battery is calculated by an oil-electricity conversion equivalent factor of the battery and the total power sequence of the battery;

[0107] a control module 404, configured to obtain a corresponding power generation target value of the range extender based on the power generation sequence of the range extender calculated by the power generation target model of the range extender, to screen an optimal power generation target value of the range extender, and to control a rotation speed and a torque of the engine of the vehicle based on the optimal power generation target value of the range extender.

[0108] In an implementable embodiment, the calculation module comprises:

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

[0110] a first processing module, configured to obtain a power generation target value of the range extender by the power generation target model of the range extender processing the power fluctuation penalty value sequence, the equivalent energy consumption sequence of the battery and the minimum fuel consumption power sequence of the range extender.

[0111] In an implementable embodiment, the calculation module further comprises:

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

[0113] a consolidation module, configured to consolidate the absolute value sequence and a preset power fluctuation penalty factor of the range extender to obtain a power fluctuation penalty value sequence of the range extender.

[0114] In an implementable embodiment, the processing module comprises:

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

[0116] The second processing module is configured to process the minimum fuel consumption rate sequence of the range extender based on the preset low heat value of fuel to obtain a minimum fuel consumption power sequence of the range extender.

[0117] In an embodiment, the processing module further comprises:

[0118] The discrete module is configured to discretize different powers of the range extender to establish a power generation power sequence of the range extender based on the discretized different powers of the range extender.

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

[0120] In an embodiment, the calculation module further comprises:

[0121] The fourth calculation module is configured to calculate an oil-electricity conversion equivalent factor of the battery based on the state of charge of the battery.

[0122] The joint module is configured to combine the oil-electricity conversion equivalent factor of the battery and the total power sequence of the battery to obtain an equivalent energy consumption sequence of the battery, wherein 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 an embodiment, the control module comprises:

[0124] The third calculation module is configured to take the power generation power of the range extender in the power generation power sequence of the range extender as a control scalar to obtain a power generation target value of the range extender calculated by the power generation target model of the range extender.

[0125] The screening module is configured to screen based on the obtained multiple power generation target values of the range extender to obtain an optimal power generation target value of the range extender.

[0126] Embodiment 3

[0127] The embodiments of the present application also provide an electronic device, such as Figure 5 As shown in the figure, the electronic device comprises 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 and the memory 502 communicate through the bus 503, and the machine readable instructions are executed by the processor 501 to perform the steps of any one of the range extender energy management methods.

[0128] Embodiment 4

[0129] The application further provides a computer readable storage medium, which stores a computer program, and the computer program performs the steps of the range extender energy management method when executed by a processor.

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

[0131] The modules described as separate components can or can not be physically separated, and the components shown as modules can or can not be physical units, i.e. can be located in one place or distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

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

[0133] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a platform server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the application. The foregoing storage medium includes a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various program code storage media.

[0134] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A range extender energy management method, characterized in that, The method is suitable for a vehicle and comprises the following steps: calculating a driving demand mechanical power of the vehicle based on the depth of the accelerator pedal being depressed when the vehicle is driven, and obtaining a driving demand electric power of the vehicle based on the driving demand mechanical power of the vehicle, a preset driving efficiency of the electric drive assembly and an electric power of vehicle accessories; processing a power generation range of the range extender to obtain a range extender power generation sequence 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 range extender power generation sequence and the driving demand electric power of the vehicle; calculating the range extender power generation sequence to obtain a corresponding power fluctuation penalty value sequence, and obtaining a range extender power generation target value based on the range extender power fluctuation penalty value sequence, a battery equivalent energy consumption sequence and the minimum fuel consumption power sequence of the range extender by processing the range extender power generation target model; the battery equivalent energy consumption sequence is obtained based on the battery total power sequence and an oil-electricity conversion equivalent factor; obtaining the corresponding range extender power generation target value based on the range extender power generation power in the range extender power generation sequence by calculating the range extender power generation power based on the range extender power generation target model, and screening a range extender optimal power generation target value, and controlling the speed and torque of the engine of the vehicle based on the range extender optimal power generation target value; the specific calculation steps of the range extender power fluctuation penalty value sequence comprise the following steps: calculating an absolute value sequence of the difference between the range extender power generation sequence at the current moment and the actual range extender power generation power at the previous moment; integrating the absolute value sequence and a preset range extender power fluctuation penalty factor to obtain the range extender power fluctuation penalty value sequence; the power fluctuation penalty factor is used for controlling the power fluctuation of the engine, and the greater the unit power fluctuation of the engine, the greater the penalty value of the corresponding power fluctuation penalty factor.

2. The method of claim 1, wherein, the step of obtaining the range extender power generation target value based on the range extender power fluctuation penalty value sequence, the battery equivalent energy consumption sequence and the minimum fuel consumption power sequence of the range extender by processing the range extender power generation target model comprises the following steps: inputting the calculated range extender power fluctuation penalty value sequence, the battery equivalent energy consumption sequence and the minimum fuel consumption power sequence of the range extender into a preset range extender power generation target model; the range extender power generation target model processes 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.

3. The method of claim 1, wherein, the step of processing the power generation range of the range extender to obtain the range extender power generation sequence and the corresponding minimum fuel consumption power sequence comprises the following steps: calculating a range extender minimum fuel consumption rate sequence based on the range extender power generation sequence, and sending the range extender minimum fuel consumption rate sequence 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 low heat value of fuel to obtain a range extender minimum fuel consumption power sequence.

4. The method of claim 3, wherein, the step of calculating the range extender minimum fuel consumption rate sequence based on the range extender power generation sequence, and sending the range extender minimum fuel consumption rate sequence to the range extender minimum fuel consumption power model comprises the following steps: The different powers of the discrete range extender are calculated to establish a range extender power generation sequence based on the different powers of the discrete range extender; The range extender power generation sequence is processed to obtain a range extender minimum specific fuel consumption sequence, and a range extender minimum fuel consumption rate sequence is obtained based on the range extender power generation sequence and the range extender minimum specific fuel consumption sequence.

5. The method of claim 1, wherein, The specific steps for calculating the battery equivalent energy consumption sequence based on the battery total power sequence and the battery oil-electricity conversion equivalent factor include: The battery oil-electricity conversion equivalent factor is calculated based on the state of charge of the battery; The battery equivalent energy consumption sequence is obtained in combination of the battery oil-electricity conversion equivalent factor and the battery total power sequence.

6. The method of claim 1, wherein, The range extender power generation target value corresponding to the range extender power in the range extender power generation sequence is calculated based on the range extender power generation target model to screen out an optimal range extender power generation target value, and the speed and torque of the engine of the vehicle are controlled based on the optimal range extender power generation target value, including: The range extender power generation target value calculated by the range extender power generation target model is obtained with the range extender power in the range extender power generation sequence as a control scalar; The optimal range extender power generation target value is screened out based on the obtained range extender power generation target value.

7. A range extender energy management device, characterized in that, The device includes: The acquisition module is configured to calculate the driving demand mechanical power of the vehicle based on the depth of the accelerator pedal being depressed when the vehicle is driven, and to obtain the driving demand electrical power of the vehicle based on the driving demand mechanical power of the vehicle, the preset driving efficiency of the electric drive assembly, and the electrical power of the vehicle accessories; The processing module is configured to process the power generation range of the range extender to obtain a range extender power generation sequence and a corresponding minimum fuel consumption power sequence, and to obtain a battery net power sequence and a corresponding battery total power sequence based on the range extender power generation sequence and the driving demand electrical power of the vehicle; The calculation module is configured to calculate the range extender power generation sequence to obtain a corresponding power fluctuation penalty value sequence, and to obtain a range extender power generation target value based on the power fluctuation penalty value sequence of the range extender, a battery equivalent energy consumption sequence, and a minimum fuel consumption power sequence of the range extender; the battery equivalent energy consumption sequence is obtained based on the battery total power sequence and an oil-electricity conversion equivalent factor; The control module is configured to obtain a range extender power generation target value corresponding to the range extender power in the range extender power generation sequence based on the range extender power generation target model, to screen out an optimal range extender power generation target value, and to control the speed and torque of the engine of the vehicle based on the optimal range extender power generation target value; The calculation module further includes: The first calculation module is configured to calculate the absolute value sequence of the difference between the range extender power generation sequence of the range extender at the moment and the actual range extender power generation at the previous moment; The integration module is configured to integrate the absolute value sequence and a preset power fluctuation penalty factor of the range extender to obtain a power fluctuation penalty value sequence of the range extender; the power fluctuation penalty factor is used to control the power fluctuation of the engine, and the greater the unit power fluctuation of the engine, the greater the penalty value of the corresponding power fluctuation penalty factor.

8. An electronic device, comprising: The device includes: A processor, a memory, and a bus, the memory storing machine readable instructions executable by the processor, the processor in communication with the memory via the bus when the electronic device is running, the machine readable instructions, when executed by the processor, performing the steps of the method for energy management of a range extender as claimed in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, the computer program, when executed by the processor, performing the steps of the method for energy management of a range extender as claimed in any one of claims 1 to 6.

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