Power distribution optimization method and device for dual-motor system, storage medium and vehicle

Abstract

The application discloses a power distribution optimization method and device of a double-motor system, a storage medium and a vehicle, and the double-motor system comprises a first motor and a second motor, and the method comprises the following steps: acquiring a current first power distribution coefficient of the first motor; performing iteration on the current first power distribution coefficient based on an iteration algorithm; judging whether the iteration times are less than a preset number of times; if yes, returning to the step of acquiring the current first power distribution coefficient of the first motor; if no, acquiring a required power and a temperature rise power of the double-motor system; determining optimized powers corresponding to the first power distribution coefficients according to the required power, the temperature rise power and the first power distribution coefficients; and determining a first power distribution coefficient corresponding to a minimum value in the optimized powers as an optimal distribution coefficient of the first motor, so that the temperature rise of the first motor and the second motor is small, the service life of the motors is guaranteed, and the economy of the vehicle is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the power distribution field of dual-motor motor, and particularly relates to a power distribution optimization method and device of dual-motor system, a storage medium and a vehicle. BACKGROUND

[0002] The single-motor system in an electric vehicle has a low fault tolerance rate, and the unit mass power of a high-power motor is low, so that the high-power motor has a high energy consumption relative to a low-power motor under the condition of the same demand power.

[0003] At present, the single-motor system in an electric vehicle is usually replaced by a multi-motor system to solve the above problems, which can improve the reliability of the vehicle and reduce the energy consumption.

[0004] The power distribution among the multi-motors directly affects the economy of the vehicle. When the motor works at a peak power or a maximum torque, the temperature of the motor rises quickly. The motor temperature has a great influence on the copper wire resistance, the core permeability, the demagnetization of the permanent magnet and the operation characteristics of the motor. When the temperature is high to a certain extent, the core permeability will suddenly decrease, and the permanent magnet will demagnetize. In addition, the long-term operation of the motor at high temperature will also affect the service life of the motor. SUMMARY

[0005] The present application provides a power distribution optimization method and device of dual-motor system, a storage medium and a vehicle to solve the problem that the high temperature rise in the operation process of the motor of the vehicle affects the system performance.

[0006] According to an aspect of the present application, a power distribution optimization method of dual-motor system is provided, the dual-motor system comprising a first motor and a second motor, comprising:

[0007] obtaining a current first power distribution coefficient of the first motor;

[0008] iterating the current first power distribution coefficient based on an iteration algorithm;

[0009] judging whether the iteration number exceeds a preset number;

[0010] if yes, returning to the step of obtaining the current first power distribution coefficient of the first motor;

[0011] if no, obtaining a demand power and a temperature rise power of the dual-motor system;

[0012] determining an optimized power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power and each first power distribution coefficient;

[0013] determining the first power distribution coefficient corresponding to the minimum value of each optimized power as an optimal distribution coefficient of the first motor.

[0014] Optionally, the temperature rise power of the dual-motor system is obtained, comprising:

[0015] obtaining a temperature rise weight, a first temperature rise coefficient of the first motor at present and a second temperature rise coefficient of the second motor at present;

[0016] determining the temperature rise power of the dual-motor system according to the temperature rise weight, the first temperature rise coefficient and the second temperature rise coefficient.

[0017] Optionally, the first temperature rise coefficient of the first motor at present is obtained, comprising:

[0018] obtaining a first rotating speed and a first torque of the first motor at present;

[0019] obtaining a mapping relationship between rotating speed, torque and temperature rise coefficient in advance;

[0020] determining the first temperature rise coefficient of the first motor at present according to the first rotating speed and the first torque based on the mapping relationship between rotating speed, torque and temperature rise coefficient.

[0021] Optionally, the second temperature rise coefficient of the second motor at present is obtained, comprising:

[0022] obtaining a second rotating speed and a second torque of the second motor at present;

[0023] obtaining a mapping relationship between rotating speed, torque and temperature rise coefficient in advance;

[0024] determining the second temperature rise coefficient of the second motor at present according to the second rotating speed and the second torque based on the mapping relationship between rotating speed, torque and temperature rise coefficient.

[0025] Optionally, the mapping relationship between rotating speed, torque and temperature rise coefficient in advance is obtained, comprising:

[0026] obtaining temperature rise data of the first motor or the second motor under each test rotating speed and each test torque;

[0027] normalizing each temperature rise data to determine a temperature rise coefficient under each test rotating speed and each test torque;

[0028] determining the mapping relationship between the test rotating speed, the test torque and the temperature rise coefficient as the mapping relationship between rotating speed, torque and temperature rise coefficient.

[0029] Optionally, the optimized power corresponding to each first power distribution coefficient is determined according to the demand power, the temperature rise power and each first power distribution coefficient, comprising:

[0030] obtaining an optimization objective function of power distribution;

[0031] determine an optimized power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power and each first power distribution coefficient based on the optimized objective function of the power distribution;

[0032] The optimized objective function of the power distribution is P opt = k 1* P req + (1-k1) *P req +P T ;

[0033] wherein P opt is the optimized power, k1 is the first power distribution coefficient of the first motor, P req is the demand power, and P T is the temperature rise power.

[0034] Optionally, the temperature rise power of the dual-motor system is determined according to the temperature rise weight, the first temperature rise coefficient and the second temperature rise influence coefficient, comprising:

[0035] determining the product of the temperature rise weight and the first temperature rise coefficient as the first temperature rise power of the first motor;

[0036] determining the product of the temperature rise weight and the second temperature rise coefficient as the second temperature rise power of the second motor;

[0037] determining the sum of the first temperature rise power and the second temperature rise power as the temperature rise power of the dual-motor system.

[0038] According to another aspect of the present application, a power distribution optimization device of a dual-motor system is provided, the dual-motor system comprising a first motor and a second motor, comprising:

[0039] a power distribution coefficient acquisition module configured to acquire a current first power distribution coefficient of the first motor;

[0040] a coefficient iteration module configured to iteratively process the current first power distribution coefficient based on an iterative algorithm;

[0041] a judgment module configured to judge whether the number of iterations exceeds a preset number;

[0042] a loop module configured to return the power distribution coefficient acquisition module to acquire the current first power distribution coefficient of the first motor when the judgment module determines whether the number of iterations exceeds the preset number;

[0043] a power acquisition module, configured to acquire a demand power and a temperature rise power of the dual-motor system when the determination module determines whether the iteration number exceeds the preset number;

[0044] an optimal power determination module, configured to determine an optimal power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power and each first power distribution coefficient;

[0045] an optimal distribution coefficient determination module, configured to determine the first power distribution coefficient corresponding to the minimum value of the optimal powers as the optimal distribution coefficient of the first motor.

[0046] According to another aspect of the present application, there is provided a computer readable storage medium storing computer instructions for causing a processor to implement the power distribution optimization method of the dual-motor system when executed.

[0047] According to another aspect of the present application, there is provided a vehicle comprising a dual-motor system and the power distribution optimization device.

[0048] The power distribution optimization method of the dual-motor system provided by the embodiments of the present application considers the temperature rise power required due to motor temperature rise when determining the power distribution of the two motors in the dual-motor system, so that the first power distribution coefficient corresponding to the minimum value of the optimal powers can be determined as the optimal distribution power of the first motor, the temperature rise power of the first motor and the second motor can be controlled within a smaller range, the temperature rise of the first motor and the second motor can be ensured to be small, the influence of high motor temperature on the copper conductor resistance, the core permeability, the permanent magnet demagnetization and the motor operating characteristics can be avoided, the service life of the motor can be ensured, and the vehicle economy can be effectively improved.

[0049] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0051] Figure 1 is a structural schematic diagram of a dual-motor system provided by the embodiments of the present application;

[0052] Figure 2 is a flow chart of a power distribution optimization method of a dual motor system provided by an embodiment of the present application;

[0053] Figure 3 is a flow chart of another power distribution optimization method of a dual motor system provided by an embodiment of the present application;

[0054] Figure 4 is a structural schematic diagram of a power distribution optimization device of a dual motor system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person of ordinary skill in the art without making creative efforts should fall within the protection scope of the present application.

[0056] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] The embodiments of the present application provide a power distribution optimization method of a dual motor system, which can reduce the temperature rise of the motor. The power distribution optimization method of the dual motor system can be executed by the power distribution optimization device of the dual motor system provided by the embodiments of the present application. The power distribution optimization device of the dual motor system can be realized in the form of software and / or hardware, and the power distribution optimization device of the dual motor system can be configured in the controller of the vehicle.

[0058] Figure 1 is a structural schematic diagram of a dual motor system provided by an embodiment of the present application, as Figure 1As shown, the dual-motor system includes a first motor 1 and a second motor 2, and the first motor 1 and the second motor 2 can output electric energy at the same time during vehicle driving. Among them, one of the first motor 1 and the second motor 2 can act as a generator, and the other can act as a driving motor. In addition, the first motor 1 is connected with a first gearbox 3, and the second motor 2 is connected with a second gearbox 4, the first gearbox 3 is used to adjust the speed of the first motor 1, and the second gearbox 4 is used to adjust the speed of the second motor 2.

[0059] Based on the above dual-motor system, Figure 2 is a flow chart of a power distribution optimization method of a dual-motor system provided by an embodiment of the present application, as Figure 2 shown, the method comprises:

[0060] S110, obtaining the current first power distribution coefficient of the first motor.

[0061] Specifically, the first power distribution coefficient can be the power distribution ratio of the first motor. Assuming that the first power distribution coefficient is k1, the value range thereof is 0≤k1≤1. In the dual-motor system, the sum of the first power distribution coefficient of the first motor and the second power distribution coefficient of the second motor can be 1. When obtaining the current first power distribution coefficient of the first motor, any random value in the interval [0, 1] can be taken as the current first power distribution coefficient of the first motor.

[0062] S120, based on an iterative algorithm, iterating the current first power distribution coefficient.

[0063] Specifically, after obtaining the first power distribution coefficient, the iterative algorithm can be used to iterate the first power distribution coefficient. Exemplarily, the iterative formula can be k1=k1+a, and the value of a can be set according to design requirements, for example, it can be 0.1. Then, multiple first power distribution coefficients can be obtained based on the above iterative algorithm.

[0064] S130, judging whether the iteration number exceeds a preset number; if yes, returning to execute step S110; if no, executing step S140.

[0065] Specifically, the termination condition of the iterative algorithm can be that the iteration number exceeds the preset number, that is, if the iteration number does not exceed the preset number, the current first power distribution coefficient of the first motor is obtained again, and the current first power distribution coefficient is iterated based on the iterative algorithm. If the iteration number exceeds the preset number, the iteration of the first power distribution coefficient is stopped. In a feasible embodiment, the value range of the first power distribution coefficient can also be taken as the termination condition of the iterative algorithm, for example, if the first power distribution coefficient is greater than 1, the iteration is stopped, or if the first power distribution coefficient is less than 0, the iteration is stopped.

[0066] S140, acquire the demand power and the temperature rise power of the dual-motor system.

[0067] Specifically, the demand power of the dual-motor system can be the power required for the vehicle to run, which can include the mechanical power and the power required for power supply. The temperature rise can be the difference between the temperature of the motor and the ambient temperature, and the temperature rise power can be the power consumed by the first motor and the second motor when working due to temperature rise.

[0068] S150, determine the optimized power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power and each first power distribution coefficient.

[0069] Specifically, one optimized power corresponding to one first power distribution coefficient can be determined according to the demand power, the temperature rise power and the first power distribution coefficient. Since multiple first power distribution coefficients are obtained based on the iterative algorithm, multiple optimized powers corresponding to each first power distribution coefficient can be determined according to the demand power, the temperature rise power and each first power distribution coefficient.

[0070] Specifically, in determining the optimized power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power and each first power distribution coefficient, an optimization objective function of power distribution can be obtained first; based on the optimization objective function of power distribution, the optimized power corresponding to each first power distribution coefficient is determined according to the demand power, the temperature rise power and each first power distribution coefficient. Wherein, the optimization objective function of power distribution is: P opt =k 1* P req +(1-k1)*P req +P T . P opt is the optimized power, k1 is the first power distribution coefficient of the first motor, P req is the demand power, P T is the temperature rise power.

[0071] Specifically, (1-k1) can be understood as the second power distribution coefficient of the second motor, and k 1* P req can represent the power required to be output by the first motor when the demand power is P req , (1-k1)*P req can represent the power required to be output by the second motor when the demand power is P req , and the temperature rise power P T is the power consumed by the first motor and the second motor when outputting power according to the above power distribution due to temperature rise.

[0072] S160, determine the first power distribution coefficient corresponding to the minimum value of each optimized power as the optimal distribution coefficient of the first motor.

[0073] Specifically, the first power distribution coefficient corresponding to the minimum value of the plurality of optimized powers can be selected as the optimal distribution coefficient of the first motor. Assuming that the optimal distribution coefficient of the first motor is k1', the optimal distribution coefficient of the second motor is k2'. In this way, since the temperature rise power of the dual-motor system is considered when the optimized powers are determined, the temperature rise power of the first motor and the second motor can be controlled within a smaller range when the demand power is distributed to the first motor and the second motor with the optimal distribution coefficient, that is, the temperature rise of the first motor and the second motor can be small, so that the influence of high motor temperature on the copper wire resistance, the core permeability, the permanent magnet demagnetization and the motor operating characteristics, etc. can be avoided, the service life of the motor can be guaranteed, and the vehicle economy can be effectively improved.

[0074] For example, the power distribution optimization method of the dual-motor system provided by the embodiment of the application can be completed through bench testing of the dual-motor system. After the optimal distribution coefficient of the first motor is determined, the optimal distribution coefficient can be stored offline, so that the optimal distribution coefficient can be directly used to distribute the polar power of the first motor and the second motor when the vehicle is running.

[0075] The power distribution optimization method of the dual-motor system provided by the embodiment of the application considers the temperature rise power required due to the temperature rise of the motor when determining the power distribution of the two motors in the dual-motor system, so that the temperature rise power of the first motor and the second motor can be controlled within a smaller range when the first power distribution coefficient corresponding to the minimum value of the plurality of optimized powers is used as the optimal distribution power of the first motor, the temperature rise of the first motor and the second motor can be small, so that the influence of high motor temperature on the copper wire resistance, the core permeability, the permanent magnet demagnetization and the motor operating characteristics, etc. can be avoided, the service life of the motor can be guaranteed, and the vehicle economy can be effectively improved.

[0076] Optionally, Figure 3 is a flowchart of another power distribution optimization method of a dual-motor system provided by the embodiment of the application, as shown in Figure 3 The method comprises the following steps:

[0077] S210, obtaining a current first power distribution coefficient of a first motor.

[0078] S220, performing iteration on the current first power distribution coefficient based on an iteration algorithm.

[0079] S230, determining whether the number of iterations exceeds a preset number; if yes, returning to step S210; if no, performing step S240.

[0080] S240, obtaining a demand power of a dual-motor system.

[0081] S250, obtain the temperature rise weight, the first temperature rise coefficient of the first motor at present, and the second temperature rise coefficient of the second motor at present.

[0082] Specifically, the temperature rise weight can be obtained according to experience, the first temperature rise coefficient of the first motor at present can be determined according to the current speed and torque of the first motor, and the second temperature rise coefficient of the second motor at present can be determined according to the current speed and torque of the second motor. In order to facilitate distinction, the current speed and torque of the first motor are referred to as the first speed and the first torque respectively, and the current speed and torque of the second motor are referred to as the second speed and the second torque respectively.

[0083] For example, when the first temperature rise coefficient of the first motor at present is obtained, the first speed and the first torque of the first motor at present can be obtained first, and then the mapping relationship between the speed, the torque and the temperature rise coefficient stored in advance can be obtained, so that the first temperature rise coefficient of the first motor at present can be determined according to the first speed and the first torque based on the mapping relationship between the speed, the torque and the temperature rise coefficient.

[0084] Similarly, when the second temperature rise coefficient of the second motor at present is obtained, the second speed and the second torque of the second motor at present can be obtained first, and then the mapping relationship between the speed, the torque and the temperature rise coefficient stored in advance can be obtained, so that the second temperature rise coefficient of the second motor at present can be determined according to the second speed and the second torque based on the mapping relationship between the speed, the torque and the temperature rise coefficient.

[0085] In the process of obtaining the first temperature rise coefficient of the first motor at present and the second temperature rise coefficient of the second motor at present, the mapping relationship between the speed, the torque and the temperature rise coefficient can be obtained only once to simplify the optimization process. The mapping relationship between the speed, the torque and the temperature rise coefficient can be a three-dimensional data table, or a function relationship between the speed, the torque and the temperature rise coefficient, which is not limited in the embodiment of the application. Moreover, the mapping relationship between the speed, the torque and the temperature rise coefficient can be obtained by test or determined by big data fitting.

[0086] For example, obtaining the mapping relationship between the speed, the torque and the temperature rise coefficient stored in advance can include the following steps:

[0087] S01, obtain the temperature rise data under each test speed and each test torque of the first motor or the second motor.

[0088] Specifically, the temperature rise data of one of the first motor and the second motor can be acquired, and a mapping relationship between the rotation speed, the torque and the temperature rise coefficient is determined based on the temperature rise data. At this time, the first temperature rise coefficient of the first motor and the second temperature rise coefficient of the second motor can be determined based on the mapping relationship between the rotation speed, the torque and the temperature rise coefficient, so as to simplify the determination process of the mapping relationship. Alternatively, in other feasible embodiments, the temperature rise data of the first motor and the second motor can be acquired respectively. In this way, the mapping relationship between the rotation speed, the torque and the temperature rise coefficient corresponding to the first motor can be determined based on the temperature rise data of the first motor, and the mapping relationship between the rotation speed, the torque and the temperature rise coefficient corresponding to the second motor can be determined based on the temperature rise data of the second motor. At this time, when the first temperature rise coefficient of the first motor is determined, the mapping relationship between the rotation speed, the torque and the temperature rise coefficient corresponding to the first motor can be used, and when the second temperature rise coefficient of the second motor is determined, the mapping relationship between the rotation speed, the torque and the temperature rise coefficient corresponding to the second motor can be used. In this way, the accuracy of the temperature rise coefficient can be improved, and the accuracy of the subsequent power distribution of the first motor and the second motor can be improved. The following exemplary description is based on the acquisition of the temperature rise data of one of the first motor and the second motor (for example, the first motor).

[0089] The first motor can be set at a certain test rotation speed, the output torque of the first motor (i.e., the test torque) is adjusted at the rotation speed, the temperature of the motor under each torque is tested, and the difference between the temperature and the ambient temperature is taken as the temperature rise data under each torque. Then the test rotation speed of the motor is adjusted, and the test torque of the first motor is adjusted at the rotation speed, and the temperature rise data corresponding to each torque when the first motor operates at the current rotation speed is acquired. The above steps are repeated until the temperature rise data in the preset rotation speed range and the preset torque range is traversed, thereby completing the acquisition of the temperature rise data under each test rotation speed and each test torque.

[0090] S02, normalize each temperature rise data to determine the temperature rise coefficient under each test rotation speed and each test torque.

[0091] Specifically, in order to facilitate calculation, the temperature rise data can be de-dimensioned, i.e., normalized, and each normalized temperature rise coefficient can be determined as the temperature rise coefficient under each test torque. The present embodiment exemplary provides a three-dimensional data table of test rotation speed, test torque and temperature rise coefficient, as shown in Table 1. It can be understood that the numerical range of the test rotation speed and the test torque is not limited to this.

[0092] Table 1. Three-dimensional data table of test rotation speed, test torque and temperature rise coefficient

[0093]

[0094] S03, the mapping relationship between the test speed, the test torque and the temperature rise coefficient is determined as the mapping relationship between the speed, the torque and the temperature rise coefficient.

[0095] Specifically, the mapping relationship between the test speed, the test torque and the temperature rise coefficient obtained above can be determined as the mapping relationship between the speed, the torque and the temperature rise coefficient, and stored. In this way, when the first temperature rise coefficient of the first motor and the second temperature rise coefficient of the second motor are determined, the current first speed and the first torque of the first motor can be detected in real time, and the second speed and the second torque of the second motor can be detected, so that the current first temperature rise coefficient of the first motor and the current second temperature rise coefficient of the second motor can be obtained by table lookup.

[0096] S260, determining the temperature rise power of the dual-motor system according to the temperature rise weight, the first temperature rise coefficient and the second temperature rise influence coefficient.

[0097] Specifically, the temperature rise power of the dual-motor system can be the sum of the first temperature rise power of the first motor and the second temperature rise power of the second motor, so when the temperature rise power of the dual-motor system is determined, the first temperature rise power of the first motor and the second temperature rise power of the second motor can be determined first.

[0098] Specifically, the temperature rise weight and the first temperature rise coefficient can be determined as the product of the first temperature rise power of the first motor, and the temperature rise weight and the second temperature rise coefficient can be determined as the product of the second temperature rise power of the second motor, so that the sum of the first temperature rise power and the second temperature rise power is determined as the temperature rise power of the dual-motor system. That is, P T = ω * (c1 + c2), where ω is the temperature rise weight, c1 is the first temperature rise coefficient, and c2 is the second temperature rise coefficient. Since the first temperature rise coefficient c1 and the second temperature rise coefficient c2 are dimensionless data, the unit of the temperature rise weight ω can be kilowatt (kW).

[0099] S270, determining the optimized power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power and each first power distribution coefficient.

[0100] S280, determining the first power distribution coefficient corresponding to the minimum value of each optimized power as the optimal distribution coefficient of the first motor.

[0101] Specifically, each first speed, each first torque of the first motor, each second speed, each second torque of the second motor and the optimal distribution coefficient of each first motor can be stored correspondingly, so that in the process of vehicle operation, the optimal distribution coefficient of the first motor can be determined through the real-time speed and torque of the first motor and the real-time speed and torque of the second motor, and the power distribution of the first motor and the second motor can be realized, effectively improving the power distribution efficiency in the process of vehicle operation.

[0102] The power distribution optimization method of the double-motor system provided by the embodiments of the present application calibrates the first temperature rise coefficients of the first motor under various rotation speeds and various torques, and calibrates the first temperature rise coefficients of the second motor under various rotation speeds and various torques, and determines the respective distribution power coefficients of the first motor and the second motor under different rotation speeds and torques based on the above. Thus, during the operation of the vehicle, the respective power distributions of the first motor and the second motor can be directly determined according to the current rotation speeds and torques of the first motor and the second motor, the power distribution efficiency during the operation of the vehicle can be effectively improved, the temperature rise power of the first motor and the second motor can be controlled within a smaller range, the temperature rise of the first motor and the second motor is ensured to be small, the influence of the high motor temperature on the copper wire resistance, the core permeability, the demagnetization of the permanent magnet, the operation characteristics of the motor and the like can be avoided, the service life of the motor can be ensured, and the economy of the vehicle can be effectively improved.

[0103] Based on the same inventive concept, the embodiments of the present application further provide a power distribution optimization device of a double-motor system, wherein the double-motor system comprises a first motor and a second motor, and the power distribution optimization device of the double-motor system is used to execute the power distribution optimization method of the double-motor system provided by any of the embodiments of the present application. The power distribution optimization device of the double-motor system can be realized by software and / or hardware, and therefore the power distribution optimization device of the double-motor system provided by the embodiments of the present application comprises the technical features of the power distribution optimization method of the double-motor system provided by any of the embodiments of the present application, and can achieve the beneficial effects of the power distribution optimization method of the double-motor system provided by any of the embodiments of the present application. The same parts can be referred to the above description of the power distribution optimization method of the double-motor system provided by the embodiments of the present application, and will not be described here again.

[0104] Optionally, Figure 4 is a structural schematic diagram of a power distribution optimization device of a double-motor system provided by the embodiments of the present application, like Figure 4As shown, the power distribution optimization device of the dual-motor system includes a power distribution coefficient acquisition module 100, configured to acquire a current first power distribution coefficient of the first motor; a coefficient iteration module 200, configured to iteratively process the current first power distribution coefficient based on an iterative algorithm; a judgment module 300, configured to judge whether the number of iterations exceeds a preset number; a loop module 400, configured to return the power distribution coefficient acquisition module to perform the step of acquiring the current first power distribution coefficient of the first motor when the judgment module 300 determines whether the number of iterations exceeds the preset number; a power acquisition module 500, configured to acquire the required power and the temperature rise power of the dual-motor system when the judgment module 300 determines whether the number of iterations exceeds the preset number; an optimized power determination module 600, configured to determine the optimized power corresponding to each first power distribution coefficient according to the required power, the temperature rise power and each first power distribution coefficient; and an optimal distribution coefficient determination module 700, configured to determine the first power distribution coefficient corresponding to the minimum value of the optimized power as the optimal distribution coefficient of the first motor.

[0105] The power distribution optimization device of the dual-motor system provided by the embodiment of the application can control the temperature rise power of the first motor and the second motor in a smaller range when the first power distribution coefficient corresponding to the minimum value of the optimized power is used as the optimal distribution power of the first motor, so that the temperature rise of the first motor and the second motor is small, the influence of high motor temperature on the copper wire resistance, the core permeability, the demagnetization of the permanent magnet and the operation characteristics of the motor can be avoided, the service life of the motor can be guaranteed, and the economy of the vehicle can be effectively improved.

[0106] Optionally, the power acquisition module includes a temperature rise information acquisition submodule, configured to acquire a temperature rise weight, a current first temperature rise coefficient of the first motor and a current second temperature rise coefficient of the second motor; and a temperature rise power determination submodule, configured to determine the temperature rise power of the dual-motor system according to the temperature rise weight, the first temperature rise coefficient and the second temperature rise influence coefficient.

[0107] Optionally, the temperature rise information acquisition submodule includes a first motor information acquisition unit, configured to acquire a current first rotating speed and a first torque of the first motor; a mapping relationship acquisition unit, configured to acquire a pre-stored mapping relationship between the rotating speed, the torque and the temperature rise coefficient; and a first temperature rise coefficient determination unit, configured to determine the current first temperature rise coefficient of the first motor according to the first rotating speed and the first torque based on the mapping relationship between the rotating speed, the torque and the temperature rise coefficient.

[0108] Optionally, the temperature rise information acquisition submodule includes a second motor information acquisition unit, used to acquire the current second speed and second torque of the second motor; and a second temperature rise coefficient determination unit, used to determine the current second temperature rise coefficient of the second motor based on the mapping relationship between speed, torque and temperature rise coefficient, according to the second speed and second torque.

[0109] Optionally, the mapping relationship acquisition unit includes a temperature rise data acquisition subunit, used to acquire temperature rise data at each test speed and each test torque of the first motor or the second motor; a temperature rise coefficient determination subunit, used to normalize each temperature rise data and determine the temperature rise coefficient at each test speed and each test torque; and a mapping relationship determination subunit, used to determine the mapping relationship between the test speed, test torque and temperature rise coefficient as a mapping relationship between speed, torque and temperature rise coefficient.

[0110] Optionally, the optimized power determination module includes a function acquisition unit for acquiring the optimization objective function of power allocation; and an optimized power determination unit for determining the optimized power corresponding to each first power allocation coefficient based on the optimization objective function of power allocation, the demand power, the temperature rise power, and each first power allocation coefficient; the optimization objective function of power allocation is: P opt =k 1* P req +(1-k1)*P req +P T Among them, P opt To optimize power, k1 is the first power distribution coefficient of the first motor, P req For the required power, P T This refers to the power generated by temperature rise.

[0111] Optionally, the temperature rise power determination submodule includes a first temperature rise power determination unit, used to determine the product of temperature rise weight and first temperature rise coefficient as the first temperature rise power of the first motor; a second temperature rise power determination unit, used to determine the product of temperature rise weight and second temperature rise coefficient as the second temperature rise power of the second motor; and a temperature rise power determination unit, used to determine the sum of the first temperature rise power and the second temperature rise power as the temperature rise power of the dual-motor system.

[0112] Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium storing computer instructions that are used to cause a processor to execute and implement the power allocation optimization method for a dual-motor system provided in any embodiment of the present invention.

[0113] In the context of the present application, a computer readable storage medium can be a tangible medium which can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer readable storage medium can be a machine readable signal medium. More specific examples of a machine readable storage medium will include one or more lines of a program of instructions in a transitory signal form, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0114] Based on the same inventive concept, the embodiments of the present application also provide a vehicle comprising the dual-motor system and the power distribution optimization device according to any of the embodiments of the present application, thus the vehicle according to the embodiments of the present application comprises the technical features of the power distribution optimization device of the dual-motor system according to any of the embodiments of the present application, and can achieve the beneficial effects of the power distribution optimization device of the dual-motor system according to any of the embodiments of the present application, and the same parts can refer to the description of the power distribution optimization device of the dual-motor system according to the embodiments of the present application, which will not be repeated here.

[0115] It should be understood that the various forms of flow shown above can be reordered, additional or deleted steps can be used. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, which are not limited herein.

[0116] The above detailed description does not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A power distribution optimization method for a dual-motor system including a first motor and a second motor, characterized by, The method comprises the following steps: obtaining a current first power distribution coefficient of the first motor; iterating the current first power distribution coefficient based on an iterative algorithm; determining whether the number of iterations exceeds a preset number; if yes, returning to the step of obtaining the current first power distribution coefficient of the first motor; if no, obtaining a demand power and a temperature rise power of the dual-motor system; determining an optimized power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power and each first power distribution coefficient; determining the first power distribution coefficient corresponding to the minimum value of each optimized power as the optimal distribution coefficient of the first motor; obtaining the temperature rise power of the dual-motor system, comprising: obtaining a temperature rise weight, a current first temperature rise coefficient of the first motor and a current second temperature rise coefficient of the second motor; determining the temperature rise power of the dual-motor system according to the temperature rise weight, the first temperature rise coefficient and the second temperature rise coefficient; determining an optimized power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power and each first power distribution coefficient, comprising: obtaining an optimization objective function of power distribution; determining an optimized power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power and each first power distribution coefficient based on the optimization objective function of power distribution; The optimization objective function of the power allocation is: P opt =k 1* P req +(1-k1)*P req +P T ; wherein P opt is the optimized power, k1 is a first power distribution coefficient of the first electric machine, P req is the required power, P T is the temperature rise power.

2. The power distribution optimization method of a dual motor system according to claim 1, characterized by, obtaining a current first temperature rise coefficient of the first motor, comprising: obtaining a current first rotating speed and a current first torque of the first motor; obtaining a pre-stored mapping relationship between rotating speed, torque and temperature rise coefficient; determining the current first temperature rise coefficient of the first motor according to the first rotating speed and the first torque based on the mapping relationship between rotating speed, torque and temperature rise coefficient.

3. The power distribution optimization method of a dual motor system according to claim 1, characterized by, obtaining a current second temperature rise coefficient of the second motor, comprising: obtaining a current second rotating speed and a current second torque of the second motor; obtaining a pre-stored mapping relationship between rotating speed, torque and temperature rise coefficient; determining the current second temperature rise coefficient of the second motor according to the second rotating speed and the second torque based on the mapping relationship between rotating speed, torque and temperature rise coefficient.

4. The power distribution optimization method of a dual motor system according to claim 2 or 3, characterized by, obtaining a pre-stored mapping relationship between rotating speed, torque and temperature rise coefficient, comprising: obtaining temperature rise data under each test rotating speed and each test torque of the first motor or the second motor; normalizing each temperature rise data to determine a temperature rise coefficient under each test rotating speed and each test torque; determining the mapping relationship between the test rotating speed, the test torque and the temperature rise coefficient as the mapping relationship between rotating speed, torque and temperature rise coefficient.

5. The power distribution optimization method of a dual motor system according to claim 1, characterized by, determining the temperature rise power of the dual-motor system according to the temperature rise weight, the first temperature rise coefficient and the second temperature rise influence coefficient, comprising: determining the product of the temperature rise weight and the first temperature rise coefficient as a first temperature rise power of the first motor; determining the product of the temperature rise weight and the second temperature rise coefficient as a second temperature rise power of the second motor; determining the sum of the first temperature rise power and the second temperature rise power as the temperature rise power of the dual-motor system.

6. A power distribution optimization device for a dual motor system including a first motor and a second motor, characterized by, The method comprises the following steps: The power distribution coefficient obtaining module is configured to obtain a current first power distribution coefficient of the first motor. The coefficient iteration module is configured to perform iteration on the current first power distribution coefficient based on an iteration algorithm. The judgment module is configured to determine whether the iteration number exceeds a preset number. The loop module is configured to return to the power distribution coefficient obtaining module to execute the step of obtaining the current first power distribution coefficient of the first motor when the judgment module determines whether the iteration number exceeds the preset number. The power obtaining module is configured to obtain a demand power and a temperature rise power of the dual-motor system when the judgment module determines whether the iteration number exceeds the preset number. The optimal power determination module is configured to determine an optimal power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power, and each first power distribution coefficient. The optimal distribution coefficient determination module is configured to determine the first power distribution coefficient corresponding to the minimum value of the optimal powers as the optimal distribution coefficient of the first motor. The power obtaining module includes a temperature rise information obtaining submodule configured to obtain a temperature rise weight, a current first temperature rise coefficient of the first motor, and a current second temperature rise coefficient of the second motor. The temperature rise power determination submodule is configured to determine the temperature rise power of the dual-motor system according to the temperature rise weight, the first temperature rise coefficient, and the second temperature rise coefficient. The optimal power determination module includes a function obtaining unit configured to obtain an optimization objective function of power distribution. The optimal power determination unit is configured to determine an optimal power corresponding to each first power distribution coefficient according to the demand power, the temperature rise power, and each first power distribution coefficient based on the optimization objective function of power distribution. The optimization objective function of the power allocation is: P opt = k 1* P req + (1 - k1) * P req + P T ; wherein P opt is the optimized power, k1 is a first power distribution coefficient of the first electric machine, P req is the demand power, P T is the temperature rise power.

7. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions, and the computer instructions are used to make the processor execute the dual-motor system power distribution optimization method in any one of claims 1-5.

8. A vehicle characterized by comprising: The dual-motor system and the power distribution optimization device in claim 6 are included. ​

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