Hybrid Vehicle Power Battery Boost Strategy Matching Method, System, Vehicle and Storage Medium

Abstract

The present invention discloses a hybrid vehicle power battery boost strategy matching method, system, vehicle, and storage medium. The method includes an input source, which is loss data from each subsystem, including an engine loss map, a generator loss map group, a drive motor loss map group, and a boost module loss map group. The output is a boost strategy map at different power battery voltages, with the horizontal axis of the boost strategy map representing the drive motor speed and the vertical axis representing the drive motor torque. The boost strategy is based on the principle of minimizing system losses, relying on the drive motor speed-torque dimension, and selecting the optimal intermediate voltage operating point based on the loss data from each subsystem. This method addresses the problem in existing technologies that fail to consider engine and boost module losses, resulting in the inability of the boost strategy to achieve the lowest global loss, thereby further improving vehicle fuel consumption.

Description

Technical Field

[0001] The present invention belongs to the technical field of hybrid vehicles, and in particular relates to a hybrid vehicle power battery boost strategy matching method, system, vehicle and storage medium. Background Art

[0002] Battery boost technology refers to the process of increasing the power battery voltage to a value higher than the battery voltage through a high-voltage-high-voltage DC converter (hereinafter referred to as the boost module) in vehicles equipped with electric drive systems, and outputting it to the DC side of the motor for power supply. Boost technology increases the freedom of battery voltage platform design, allowing for the use of power batteries with lower power under the same performance requirements, thereby reducing system hardware costs. At the same time, for the same operating point of the motor system, the motor has different losses under different bus voltages. By dynamically adjusting the inverter bus voltage through the boost module, the motor system can always operate in a low-loss state, thereby optimizing system efficiency and achieving improved fuel consumption. This technology was first developed and applied by Japanese automakers and is currently mainly used in the P13-configured HEV models of Toyota and Honda.

[0003] For example, the "motor drive control device, vehicle with the motor drive control device, and motor drive control method" disclosed in patent document CN101978592A are similar to this patent. They mainly introduce a motor drive control device and control method of a series configuration. Based on the principle that the external characteristics of the system can reach the lowest loss of the motor system, the losses before and after the current voltage change are compared for each operating point to determine whether to adjust the current voltage and the target to which it needs to be adjusted. However, when matching the boost strategy, this technology implements the generator operating point according to the traditional matching strategy, without considering the change in the loss characteristics of the motor system after the intervention of the boost technology. At the same time, it only considers the loss characteristics of the generator and the drive motor, and does not consider the loss characteristics of the engine and the boost module body. The matched boost strategy cannot achieve the lowest global loss.

[0004] Therefore, it is necessary to develop a hybrid vehicle power battery boost strategy matching method, system, vehicle and storage medium. Summary of the Invention

[0005] The purpose of the present invention is to provide a hybrid vehicle power battery boost strategy matching method, system, vehicle and storage medium to solve the problem that the prior art does not consider the losses of the engine and boost module, resulting in the inability of the boost strategy to achieve the lowest global loss, thereby improving the fuel consumption of the entire vehicle.

[0006] In a first aspect, the present invention provides a hybrid vehicle power battery boost strategy matching method, comprising:

[0007] The input source is the loss data of each subsystem, including engine loss MAP, generator loss MAP group, drive motor loss MAP group and boost module loss MAP group;

[0008] The output is the boost strategy MAP under different power battery voltages. The horizontal axis of the boost strategy MAP is the drive motor speed, and the vertical axis is the drive motor torque.

[0009] Among them, the boost strategy is based on the principle of minimum system loss, relying on the speed-torque dimension of the drive motor, and selecting the optimal intermediate side voltage operating point based on the loss data of each subsystem.

[0010] Optionally, the boost strategy is based on the principle of minimum system loss, relying on the drive motor speed-torque dimension, and selecting the optimal intermediate side voltage operating point based on the loss data of each subsystem, specifically including:

[0011] S20, will i, j, k The initial value is set to 0 ，i is the voltage point number on the battery side, j is the operating point number of the drive motor, k Number the voltage points on the middle side;

[0012] S21, select battery voltage U bi ,in, U bi For the i Battery side voltage;

[0013] S22, select U bi The speed under n ij , torque T ij ,in, n ij for U bi The corresponding j speed, T ij for U bi The corresponding j torque;

[0014] S23, based on the operating point selected in S22, calculate U bi 、 n ij 、 T ij Drive power requirement under P 3ij ,in, P 3ijfor U bi The corresponding j The driving motor power at each operating point;

[0015] S24, select the middle side voltage U mijk ,based on U mijk Corresponding loss MAP calculation U mijk Drive motor loss under Δ P 3ijk ,in, U mijk for U bi 、n ij 、T ij The corresponding k The intermediate side voltage;

[0016] S25, according to U mijk The corresponding loss MAP calculates the power generation demand P 1ijk ,in, P 1ijk for U bi 、n ij 、T ij 、 U mijk Corresponding power generation demand; Determine power generation demand P 1ijk Is it less than or equal to the peak power of the power generation system? P 1max If so, calculate U mijk Minimum loss of power generation system ΔP 1ijk Otherwise, calculate U mijk The generator power is P 1max Minimum loss under ΔP 1vijk_temp , ΔP 1vijk_temp for U bi 、n ij 、T ij 、U mijkThe total power demand of the corresponding power supply system is used to calculate the power demand of the boost module. P vjk ,calculate U mijk Lower boost module loss ΔP vijk ; calculate U mijk Total losses of the lower generator and boost module ΔP 1vijk = ΔP 1ijk_temp + ΔP vijk , get the total loss of the power supply system ΔP sijk ,in, ΔP sijk for U bi 、n ij 、 T ij 、U mijk The corresponding total loss of the power supply system;

[0017] S26, the minimum power supply system loss obtained by S25 ΔP sijk Drive motor loss calculated with S24 Δ P 3ijk Summing, we get U mijk Total system loss ΔP sysloss_ijk ,in, ΔP sysloss_ijk For the i The first battery voltage platform, j The operating point and k The total system loss corresponding to the middle side voltage point;

[0018] S27, increase k , traverse all the intermediate side voltages corresponding to the current operating point, obtain the total system loss of the operating point under different target voltages, fit the obtained data according to the curve characteristics, and extract the intermediate side voltage corresponding to the minimum loss point mij_target As U bi 、n ij 、T ij The corresponding boost strategy target voltage;

[0019] S28, increase j, traverse all the driving motor operating points, repeat S23~S27, and get the battery side voltage U bi Drive motor boost strategy MAP under

[0020] S29, increase i , repeat S22 to S28 to obtain the boost strategy MAP group under all battery side voltages.

[0021] Optionally, the voltage platform of the boost module of the boost strategy includes an input voltage and an output voltage, the input voltage is the power battery voltage, and the output voltage is the intermediate side voltage after conversion by the boost module.

[0022] Optionally, the voltage platforms of the boost strategy, the generator bus voltage, the drive motor bus voltage and the output voltage platform of the boost module should correspond one to one, and the number of voltage platforms should be no less than 3.

[0023] Optionally, in the boost strategy MAP, when the selected optimal intermediate side voltage is lower than the power battery voltage and the boost module cannot actively reduce the output voltage, the boost module maintains a direct-through state.

[0024] Optionally, the drive motor loss MAP group is composed of n 1 Different intermediate side voltages U m The drive motor loss MAP composition under

[0025] The generator loss MAP group is composed of n 1 Different intermediate side voltages U m The generator loss MAP composition under the above conditions, the intermediate side voltage of the generator should correspond to the drive motor one by one;

[0026] The boost module loss MAP is composed of n 2 Different input voltages U b The boost module loss composition under

[0027] The engine loss MAP is calculated from the engine efficiency MAP.

[0028] In a second aspect, a hybrid vehicle power battery boost strategy matching system described in the present invention includes a memory and a controller, wherein the memory stores a computer-readable program, and when the computer-readable program is called by the controller, it can execute the steps of the hybrid vehicle power battery boost strategy matching method described in the present invention.

[0029] In a third aspect, a vehicle according to the present invention adopts the hybrid vehicle power battery boost strategy matching system according to the present invention.

[0030] In a fourth aspect, a storage medium according to the present invention stores a computer-readable program therein, and when the computer-readable program is called by a controller, the steps of the hybrid vehicle power battery boost strategy matching method according to the present invention can be executed.

[0031] This invention offers the following advantages: Based on the loss data of each subsystem and the principle of minimum system loss, it develops a distribution of intermediate-side target voltages for different battery-side voltages. This strategy comprehensively considers the impact of the power battery input voltage and inverter bus voltage on the efficiency of the electric drive system, achieving the highest transmission efficiency at a fixed driving demand power, ultimately improving vehicle fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a block diagram of the power hardware structure of the present invention;

[0033] Figure 2 This is a schematic diagram of input and output of the present invention;

[0034] Figure 3 is a flow chart of the present invention;

[0035] Figure 4 This is a schematic diagram of power point selection according to the present invention;

[0036] Among them, 1. Power battery, 2. Dual motor controller, 21. Boost module, 22. Generator inverter, 23. Drive motor inverter, 3. Electric drive transmission, 31. Generator, 32. Clutch, 33. Reducer, 34. Drive motor, 4. Engine. DETAILED DESCRIPTION

[0037] The present invention will be described in detail below with reference to the accompanying drawings.

[0038] like Figure 1The figure shows a block diagram of the power hardware structure of the present invention. This embodiment is applied to a P13 hybrid vehicle with a boost function. The dual-motor controller 2 includes a boost module (VCM) 21, an engine inverter 22, and a drive motor inverter 23. The electric drive transmission 3 includes a generator 31 (GM), a clutch 32, a reducer 33, and a drive motor 34. The generator inverter 22 and the drive motor inverter 23 are each connected to the boost module 21, which is in turn connected to the power battery 1. The engine (ENG) 4 and generator 31 are directly connected via a spline. The generator inverter 22 and generator 31 are connected. The three-phase windings of the drive motor inverter 23 and the drive motor 34 (TM) are connected via copper busbars or high-voltage wiring harnesses. The generator 31 and drive motor 34 are connected via a clutch 32 and a reducer 33. This structure enables the engine 4 to directly drive the wheels under certain operating conditions. The engine 4, generator 31, and boost module 21 constitute the power supply system of the system.

[0039] This method formulates the intermediate side voltage regulation strategy of the dual-motor controller by testing the engine loss MAP, generator system loss MAP, drive motor system loss MAP and boost module loss MAP. According to the current working point of the generator and drive motor, the intermediate side target voltage is reasonably selected to minimize the current system loss. The generator system loss MAP and the drive motor system loss MAP need to test at least three different voltage points. The lowest voltage point should be the lowest output voltage point of the power battery, and the highest voltage point should be the highest voltage at which the motor can work normally. The horizontal axis of the boost module loss MAP is the intermediate side voltage, and the vertical axis is the output current. Test the boost module loss MAP under different power battery voltages. The selected voltage point should cover the output voltage range of the power battery, and then apply different boost module loss MAPs to calculate the intermediate side target voltage.

[0040] like Figure 2 FIG. 1 is a schematic diagram of the input source S1 in this embodiment. The input source S1 includes:

[0041] Drive motor loss MAP group S11, the drive motor loss MAP group consists of n 1 Different intermediate side voltages U m The drive motor loss MAP composition under

[0042] Generator loss MAP group S12, the generator loss MAP group consists of n 1 Different intermediate side voltages U m The generator loss MAP composition under this condition, the GM intermediate side voltage should correspond to TM one by one;

[0043] Boost module loss MAP group S13, the boost module loss MAP group consists of n 2 Different input voltages U b The VCM loss composition under

[0044] The engine loss MAPS 14 is calculated from the engine efficiency MAP.

[0045] like Figure 4 As shown, in this embodiment, the output is the boost strategy MAP under different power battery voltages (that is, n 2 The intermediate side voltage distribution MAP under different input battery measured voltages) of the boost strategy MAP is the drive motor speed, and the vertical axis is the drive motor torque.

[0046] like Figure 3 As shown, the boost strategy matching method S2 in this embodiment specifically includes the following steps:

[0047] S20, will i, j, k The initial value is set to 0 ，i is the voltage point number on the battery side, j is the operating point number of the drive motor, k Number the voltage points on the middle side;

[0048] S21, select U bi ,in, U bi For the i Battery side voltage;

[0049] S22, select U bi The speed under n ij , torque T ij ,in, n ij for U bi The corresponding j speed, T ij for U bi The corresponding j torque;

[0050] S23, based on the operating point selected in S22, calculate U bi 、 n ij 、 Tij Drive power requirement under P 3ij ,in, P 3ij for U bi The corresponding j The driving motor power at each operating point;

[0051] S24, select the middle side voltage U mijk ,based on U mijk Corresponding loss MAP calculation U mijk Drive motor loss under Δ P 3ijk ,in, U mijk for U bi 、n ij 、T ij The corresponding k The intermediate side voltage;

[0052] S25, according to U mijk The corresponding loss MAP calculates the power generation demand P 1ijk ,in, P 1ijk for U bi 、n ij 、T ij 、 U mijk Corresponding power generation demand; Determine power generation demand P 1ijk Is it less than or equal to the peak power of the power generation system? P 1max If so, calculate U mijk Minimum loss of power generation system ΔP 1ijk Otherwise, calculate U mijk The generator power is P 1max Minimum loss under ΔP 1vijk_temp , ΔP 1vijk_temp for U bi、n ij 、T ij 、U mijk The total power demand of the corresponding power supply system is used to calculate the power demand of the boost module. P vjk ,calculate U mijk Lower boost module loss ΔP vijk ; calculate U mijk Total losses of the lower generator and boost module ΔP 1vijk = ΔP 1ijk_temp + ΔP vijk , get the total loss of the power supply system ΔP sijk ,in, ΔP sijk for U bi 、n ij 、 T ij 、U mijk The corresponding total loss of the power supply system;

[0053] S26, the minimum power supply system loss obtained by S25 ΔP sijk Drive motor loss calculated with S24 Δ P 3ijk Summing, we get U mijk Total system loss ΔP sysloss_ijk ,in, ΔP sysloss_ijk For the i The first battery voltage platform, j The operating point and k The total system loss corresponding to the middle side voltage point;

[0054] S27, increase k , traverse all the intermediate side voltages corresponding to the current operating point, obtain the total system loss of the operating point under different target voltages, fit the obtained data according to the curve characteristics, and extract the intermediate side voltage corresponding to the minimum loss point U mij_target As U bi 、n ij、T ij The corresponding boost strategy target voltage; the selected target voltage U mij The external characteristics of the motor system should be greater than the currently selected operating point to avoid the motor power being unable to output due to the selected bus voltage being too low.

[0055] S28, increase j , traverse all the driving motor operating points, repeat S23~S27, and get the battery side voltage U bi The driving motor boost strategy MAP under this strategy is x The axis coordinate is the driving motor speed, y The coordinate is the driving motor torque, z The coordinates are U bi The middle side target voltage under U mij_target .

[0056] S29, increase i , get the boost strategy MAP group under all battery side voltages. During the actual operation of the boost module, the battery side voltage changes continuously. At this time, the intermediate side target voltage is based on U bi The MAP group data of the discrete boost strategy with different dimensions are obtained by appropriate fitting method.

[0057] S20 to S29 constitute the complete boost strategy matching method of the present invention.

[0058] like Figure 4 FIG. 4 shows a method S3 for calculating the minimum loss of the power supply system in this embodiment.

[0059] Supplement system power according to power supply P 1ijk Extract the constant power curve S31, calculate the loss corresponding to each point on the curve, and then map the loss curve S32 according to the constant power curve to obtain P 1ijk The corresponding minimum loss. The constant power curve in the engine direct drive mode is the horizontal axis, that is, the 0Nm loss curve, and the corresponding loss is directly determined by the current generator speed. Figure 4 Strategy execution.

[0060] In this embodiment, the voltage platform of the boost module of the boost strategy includes an input voltage and an output voltage, the input voltage is the power battery voltage, and the output voltage is the intermediate side voltage after conversion by the boost module.

[0061] In this embodiment, the voltage platforms of the boost strategy, the generator bus voltage, the drive motor bus voltage and the output voltage platform of the boost module should correspond one to one, and the number of voltage platforms should be no less than 3.

[0062] In this embodiment, in the boost strategy MAP, when the selected optimal intermediate side voltage is lower than the power battery voltage and the boost module cannot actively reduce the output voltage, the boost module maintains a direct-on state.

[0063] In this embodiment, a hybrid vehicle power battery boost strategy matching system includes a memory and a controller. The memory stores a computer-readable program. When the computer-readable program is called by the controller, it can execute the steps of the hybrid vehicle power battery boost strategy matching method as described in this embodiment.

[0064] In this embodiment, a vehicle adopts the hybrid vehicle power battery boost strategy matching system as described in this embodiment.

[0065] In this embodiment, a storage medium stores a computer-readable program. When the computer-readable program is called by a controller, the steps of the hybrid vehicle power battery boost strategy matching method described in this embodiment are executed.

[0066] In this embodiment, the specific parameters involved are described as follows:

[0067] i Number the voltage points on the battery side;

[0068] j Number the operating point of the drive motor;

[0069] k Number the voltage points on the middle side;

[0070] U bi For the i Battery side voltage;

[0071] n ij for U bi The corresponding j speed;

[0072] T ij for U bi The corresponding j torque;

[0073] P 3ij for U bi The correspondingj The driving motor power at each operating point;

[0074] ΔP 3ijk for U bi The corresponding j Drive motor system loss at each operating point;

[0075] U mijk for U bi 、n ij 、T ij The corresponding k The intermediate side voltage;

[0076] P 1ijk for U bi 、n ij 、T ij 、U mijk The corresponding power generation demand;

[0077] P 1max The maximum power that the GM and ENG combined system can provide;

[0078] P vijk for U bi 、n ij 、T ij 、U mijk The corresponding VCM required power (when the drive motor required power is greater than the GM and ENG combined system peak power);

[0079] ΔP 1ijk_temp for U bi 、n ij 、T ij 、U mijk The power that the corresponding GM and ENG combined system needs to provide (when the required power of the drive motor is greater than the peak power of the GM and ENG combined system);

[0080] ΔP 1vijk_temp for Ubi 、n ij 、T ij 、U mijk The corresponding total power demand of the power supply system (when the required power of the drive motor is greater than the peak power of the GM and ENG combined system);

[0081] ΔP sijk for U bi 、n ij 、T ij 、U mijk The corresponding total loss of the power supply system;

[0082] ΔP sysloss_ijk For the i The first battery voltage platform, j The operating point and k The total system loss corresponding to the middle side voltage point;

[0083] U mij_target for U bi 、n ij 、T ij The corresponding intermediate side target voltage.

[0084] It should be noted that the above-mentioned embodiments are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the ideas and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hybrid vehicle power battery boost strategy matching method, characterized in that: include: The input source is the loss data of each subsystem, including engine loss MAP, generator loss MAP group, drive motor loss MAP group and boost module loss MAP group; The output is the boost strategy MAP under different power battery voltages. The horizontal axis of the boost strategy MAP is the drive motor speed, and the vertical axis is the drive motor torque. The boost strategy is based on the principle of minimizing system losses, relying on the drive motor speed-torque dimension, and selecting the optimal intermediate-side voltage operating point based on the loss data of each subsystem. The boost strategy is based on the principle of minimizing system losses, relying on the drive motor speed-torque dimension, and selecting the optimal intermediate side voltage operating point based on the loss data of each subsystem. Specifically, it includes: S20, will i, j, k The initial value is set to 0 ，i is the voltage point number on the battery side, j is the operating point number of the drive motor, k Number the voltage points on the middle side; S21, select battery voltage U bi ,in, U bi For the i Battery side voltage; S22, select U bi The speed under n ij , torque T ij ,in, n ij for U bi The corresponding j speed, T ij for U bi The corresponding j torque; S23, based on the operating point selected in S22, calculate U bi 、 n ij 、 T ij Drive power requirement under P 3ij ,in, P 3ij for U bi The corresponding j The driving motor power at each operating point; S24, select the middle side voltage U mijk ,based on U mijk Corresponding loss MAP calculation U mijk Drive motor loss under ΔP 3ijk ,in, U mijk for U bi 、n ij 、T ij The corresponding k The intermediate side voltage; S25, according to U mijk The corresponding loss MAP calculates the power generation demand P 1ijk ,in, P 1ijk for U bi 、n ij 、T ij 、U mijk Corresponding power generation demand; Determine power generation demand P 1ijk Is it less than or equal to the peak power of the power generation system? P 1max If so, calculate U mijk Minimum loss of power generation system ΔP 1ijk Otherwise, calculate U mijk The generator power is P 1max Minimum loss under ΔP 1vijk_temp , ΔP 1vijk_temp for U bi 、n ij 、T ij 、U mijk The total power demand of the corresponding power supply system is used to calculate the power demand of the boost module. P vjk ,calculate U mijk Lower boost module loss ΔP vijk ; calculate U mijk Total loss of the lower generator and boost module Δ P 1vijk =ΔP 1ijk_temp +ΔP vijk , get the total loss of the power supply system ΔP sijk ,in, ΔP sijk for U bi 、n ij 、T ij 、U mijk The corresponding total loss of the power supply system; S26, the minimum power supply system loss obtained by S25 ΔP sijk Drive motor loss calculated with S24 ΔP 3ijk Summing, we get U mijk Total system loss ΔP sysloss_ijk ,in, ΔP sysloss_ijk For the i The first battery voltage platform, j The operating point and k The total system loss corresponding to the middle side voltage point; S27, increase k , traverse all the intermediate side voltages corresponding to the current operating point, obtain the total system loss of the operating point under different target voltages, fit the obtained data according to the curve characteristics, and extract the intermediate side voltage corresponding to the minimum loss point mij_target As U bi 、n ij 、T ij The corresponding boost strategy target voltage; S28, increase j , traverse all the driving motor operating points, repeat S23~S27, and get the battery side voltage U bi Drive motor boost strategy MAP under S29, increase i , repeat S22 to S28 to obtain the boost strategy MAP group under all battery side voltages.

2. The hybrid vehicle power battery boost strategy matching method according to claim 1, characterized in that: The voltage platform of the boost module of the boost strategy includes an input voltage and an output voltage. The input voltage is the power battery voltage, and the output voltage is the intermediate side voltage after conversion by the boost module.

3. The hybrid vehicle power battery boost strategy matching method according to claim 1 or 2, characterized in that: The voltage platforms of the boost strategy, the generator bus voltage, the drive motor bus voltage and the output voltage platform of the boost module should correspond one to one, and the number of voltage platforms should be no less than 3.

4. The hybrid vehicle power battery boost strategy matching method according to claim 3, characterized in that: In the boost strategy MAP, when the selected optimal intermediate side voltage is lower than the power battery voltage and the boost module cannot actively reduce the output voltage, the boost module maintains a direct-on state.

5. The hybrid vehicle power battery boost strategy matching method according to claim 4, characterized in that: The drive motor loss MAP group is composed of n 1 Different intermediate side voltages U m The drive motor loss MAP composition under The generator loss MAP group is composed of n 1 Different intermediate side voltages U m The generator loss MAP is composed of the following: the intermediate side voltage of the generator should correspond to the drive motor one by one; The boost module loss MAP is composed of n 2 Different input voltages U b The boost module loss composition under The engine loss MAP is calculated from the engine efficiency MAP.

6. A hybrid vehicle power battery boost strategy matching system, characterized by: The method comprises a memory and a controller, wherein the memory stores a computer-readable program, and when the computer-readable program is called by the controller, the method can execute the steps of the hybrid vehicle power battery boost strategy matching method according to any one of claims 1 to 5.

7. A vehicle, characterized in that: A hybrid vehicle power battery boost strategy matching system as claimed in claim 6 is adopted.

8. A storage medium, characterized in that: A computer-readable program is stored therein, and when the computer-readable program is called by the controller, the steps of the hybrid vehicle power battery boost strategy matching method as described in any one of claims 1 to 5 can be executed.

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