Hybrid system, method, device, equipment and medium based on battery internal resistance prediction

Abstract

The present application relates to a hybrid system, method, device, equipment and medium based on battery internal resistance prediction, wherein the system includes: an engine, a gearbox, a first drive motor, a first power battery, a first charging module, a PTO shaft and a CVT shaft; the first power battery is used to provide electric energy to the first drive motor; the engine and / or the first drive motor are used to transmit power to the gearbox and the PTO shaft, and the gearbox is used to transmit power to the CVT shaft; the first charging module is used to control the first power battery to work in the range with the lowest internal resistance based on the first target corresponding relationship corresponding to the first power battery and the current first charge state. The present application can control the tractor to always work under the condition with the lowest battery internal resistance, reducing the possibility of battery life reduction and damage to charging and discharging capacity.

Description

Technical Field

[0001] The present application relates to the technical field of hybrid powertrains, and in particular to a hybrid system, method, device, equipment and medium based on battery internal resistance prediction. Background Art

[0002] As a key device connecting the engine (or power source) and the driving wheels (or actuators) of vehicles or mechanical equipment, the transmission system plays a vital role in various types of mechanical equipment. Especially in the field of agricultural machinery, such as tractors, their transmission systems need to adapt to the complex and changing working environment of farmland, including changes in soil moisture, viscosity and working scenes, to ensure that the tractor can adjust the driving speed in time to meet the diverse operating needs.

[0003] The shifting technologies widely used in traditional tractors, such as sliding gear shifting technology, high-precision meshing sleeve combined with synchronous shifter, etc., have a long history and mature technology, but they mostly rely on manual operation and are difficult to achieve accurate matching with the changing agricultural working conditions. This not only reduces the working efficiency of the tractor, but may also cause performance loss, limiting its application potential in modern agriculture.

[0004] In recent years, tractor shifting technology has been continuously innovating, and continuously variable transmission systems have gradually become mainstream. Hybrid tractors have emerged. By introducing motors as components to drive and control the gearbox, the reliability and response speed of the transmission system have been significantly improved. The motors on hybrid tractors are powered by lithium iron phosphate batteries, and the internal resistance of lithium iron phosphate batteries shows complex nonlinear changes with SOC (state of charge), which makes the battery life easily affected by the environment. There is an urgent need for a technology that can keep the battery working within the appropriate range at all times. Summary of the invention

[0005] In order to control the tractor to always operate under the condition with the lowest battery internal resistance and reduce the possibility of battery life reduction and damage to charging and discharging capabilities, the present application provides a hybrid system, method, device, equipment and medium based on battery internal resistance prediction.

[0006] In a first aspect, the present application provides a hybrid system based on battery internal resistance prediction, comprising an engine, a gearbox, a first drive motor, a first power battery, a first charging module, a PTO shaft and a CVT shaft; the first power battery is used to provide electric energy to the first drive motor; the engine and / or the first drive motor is used to transmit power to the gearbox and the PTO shaft, and the gearbox is used to transmit power to the CVT shaft;

[0007] the first charging module is configured to determine a first internal resistance corresponding to the first power battery based on a first target corresponding relationship corresponding to the first power battery and a current first state of charge, wherein the first target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the first power battery and multiple internal resistances;

[0008] and, for judging, when the first power battery is not charged, whether the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum based on the first state of charge and the first internal resistance; for judging, when the first power battery is charged, whether the first state of charge is a first SOC upper limit for maintaining the internal resistance at a minimum based on the first state of charge and the first internal resistance; for controlling the first power battery to start charging if the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum when the first power battery is not charged; and for controlling the first power battery to stop charging if the first state of charge is a first SOC upper limit for maintaining the internal resistance at a minimum when the first power battery is charged, so that the first power battery operates within the interval with the lowest internal resistance;

[0009] The first charging module is connected to the engine. When the first power battery is charged, the first charging module is also used to generate electricity through the power transmitted by the engine to charge the first power battery during driving.

[0010] The beneficial effects of the present application are as follows: the engine and the first drive motor can both be used as power sources to drive the gearbox and the PTO shaft, thereby improving the reliability of the tractor. According to the state of charge and the internal resistance, the charging state of the first power battery is controlled to ensure that the first power battery operates in the range with the lowest internal resistance in real time, thereby slowing down the decline in the life of the first power battery and reducing the possibility of damage to the charging and discharging capacity.

[0011] Furthermore, the first charging module is also used to determine a second internal resistance corresponding to the first power battery based on the first target corresponding relationship and the second state of charge, the second state of charge being the next state of charge corresponding to the current first state of charge; when the first power battery is not charged, if the first internal resistance is within the interval of the lowest internal resistance and the second internal resistance exceeds the interval of the lowest internal resistance, then the first state of charge is determined to be a first SOC lower limit for maintaining the internal resistance at the lowest; when the first power battery is being charged, if the first internal resistance is within the interval of the lowest internal resistance and the second internal resistance exceeds the interval of the lowest internal resistance, then the first state of charge is determined to be a first SOC upper limit for maintaining the internal resistance at the lowest.

[0012] The beneficial effect of adopting the above further scheme is: by introducing the internal resistance prediction working mode based on power battery power monitoring, it can ensure that the first power battery operates in the range with the lowest internal resistance in real time, slowing down the decline in the life of the first power battery and reducing the possibility of damage to the charging and discharging capacity.

[0013] Furthermore, the system further comprises a second drive motor and a second power battery; the second power battery is used to provide electric energy to the second drive motor; the second drive motor is used to transmit power to the CVT shaft;

[0014] The system further includes a second charging module, the second charging module being configured to determine a third internal resistance corresponding to the second power battery based on a second target corresponding relationship corresponding to the second power battery and a current third state of charge, wherein the second target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the second power battery and multiple internal resistances;

[0015] and, for judging, when the second power battery is not charged, based on the third state of charge and the third internal resistance, whether the third state of charge is a second SOC lower limit for keeping the internal resistance at the lowest; when the second power battery is charged, judging, based on the third state of charge and the third internal resistance, whether the third state of charge is a second SOC upper limit for keeping the internal resistance at the lowest; when the second power battery is not charged, if the third state of charge is the second SOC lower limit for keeping the internal resistance at the lowest, controlling the second power battery to start charging; when the second power battery is charged, if the third state of charge is the second SOC upper limit for keeping the internal resistance at the lowest, controlling the second power battery to stop charging; so that the second power battery operates in the interval with the lowest internal resistance;

[0016] The second charging module is connected to the engine. When the second power battery is charged, the second charging module is also used to generate electricity through the power transmitted by the engine to charge the second power battery during driving.

[0017] The beneficial effect of adopting the above further solution is that the engine and the second drive motor can both be used as power sources for the vehicle's travel system, so that the travel end (CVT) and the PTO end are both equipped with separate drive motor controls, thereby improving the reliability of the tractor's operation.

[0018] By controlling the charging state of the second power battery according to the state of charge and the internal resistance, it is possible to ensure that the second power battery operates in a range with the lowest internal resistance in real time, thereby slowing down the reduction in the life of the second power battery and reducing the possibility of damage to the charging and discharging capabilities.

[0019] In a second aspect, the present application provides a control method for a hybrid system based on battery internal resistance prediction, comprising:

[0020] Obtaining a current first state of charge corresponding to the first power battery;

[0021] Acquire a first target corresponding relationship corresponding to the first power battery, and determine a first internal resistance corresponding to the first power battery, wherein the first target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the first power battery and multiple internal resistances;

[0022] When the first power battery is not charged, judging whether the first state of charge is a first SOC lower limit for maintaining the internal resistance as the lowest based on the first state of charge and the first internal resistance; when the first power battery is not charged, if the first state of charge is a first SOC lower limit for maintaining the internal resistance as the lowest, controlling the first power battery to start charging;

[0023] When the first power battery is charged, based on the first state of charge and the first internal resistance, it is determined whether the first state of charge is a first SOC upper limit that keeps the internal resistance at a minimum; when the first power battery is charged, if the first state of charge is a first SOC upper limit that keeps the internal resistance at a minimum, the first power battery is controlled to stop charging.

[0024] The beneficial effects of the present application are as follows: by controlling the charging state of the first power battery according to the state of charge and the internal resistance, it is possible to ensure that the first power battery operates in a range with the lowest internal resistance in real time, thereby slowing down the decline in the life of the first power battery and reducing the possibility of damage to the charging and discharging capabilities.

[0025] Furthermore, the method further comprises:

[0026] Obtaining a current third state of charge corresponding to the second power battery;

[0027] acquiring a second target corresponding relationship corresponding to the second power battery, and determining a third internal resistance corresponding to the second power battery, wherein the second target corresponding relationship is a corresponding relationship between multiple charge states and multiple internal resistances corresponding to the second power battery;

[0028] When the second power battery is not charged, judging whether the third state of charge is a second SOC lower limit for maintaining the internal resistance as the lowest based on the third state of charge and the third internal resistance; when the second power battery is not charged, if the third state of charge is a second SOC lower limit for maintaining the internal resistance as the lowest, controlling the second power battery to start charging;

[0029] When the second power battery is charged, based on the third state of charge and the third internal resistance, it is determined whether the third state of charge is a second SOC upper limit for maintaining the internal resistance as the lowest; when the second power battery is charged, if the third state of charge is a second SOC upper limit for maintaining the internal resistance as the lowest, the second power battery is controlled to stop charging.

[0030] Furthermore, the method further comprises:

[0031] Get engine speed in real time;

[0032] If the engine speed is lower than a preset speed threshold, the engine is controlled not to transmit power to the PTO shaft and the CVT shaft, the first drive motor is controlled to transmit power to the PTO shaft, and the second drive motor is controlled to transmit power to the CVT shaft.

[0033] Further, after the real-time acquisition of the engine speed, the method further includes:

[0034] Based on the engine speed, if the speed change of the vehicle is within a preset speed range, the engine is controlled to transmit power to the PTO shaft, and the engine and the second drive motor are controlled to transmit power to the CVT shaft.

[0035] In a third aspect, the present application provides a control device for a hybrid system based on battery internal resistance prediction, comprising:

[0036] A first acquisition module, used to acquire a current first state of charge corresponding to a first power battery;

[0037] a first determining module, configured to obtain a first target corresponding relationship corresponding to the first power battery, and determine a first internal resistance corresponding to the first power battery, wherein the first target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the first power battery and multiple internal resistances;

[0038] a first charging start module, configured to, when the first power battery is not charged, determine, based on the first state of charge and the first internal resistance, whether the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum; when the first power battery is not charged, if the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum, control the first power battery to start charging;

[0039] The first charging stop module is used to determine whether the first state of charge is a first SOC upper limit for maintaining the internal resistance as the lowest when the first power battery is charged, based on the first state of charge and the first internal resistance; when the first power battery is charged, if the first state of charge is a first SOC upper limit for maintaining the internal resistance as the lowest, then control the first power battery to stop charging.

[0040] In a fourth aspect, the present application provides an electronic device, comprising a processor and a memory, wherein the processor is coupled to the memory;

[0041] The processor is used to execute the computer program stored in the memory so that the electronic device performs the method as described in any one of the second aspects.

[0042] In a fifth aspect, the present application provides a computer-readable storage medium, comprising a computer program or instructions, which, when executed on a computer, enables the computer to execute the method as described in any one of the second aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a structural block diagram of a hybrid system based on battery internal resistance prediction according to an embodiment of the present application;

[0044] Figure 2 This is a flow chart of a method for controlling a first power battery of a hybrid system based on battery internal resistance prediction according to an embodiment of the present application;

[0045] Figure 3 This is a flow chart of a method for controlling a second power battery of a hybrid system based on battery internal resistance prediction according to an embodiment of the present application;

[0046] Figure 4 This is a structural block diagram of a control device for a hybrid system based on battery internal resistance prediction according to an embodiment of the present application;

[0047] Figure 5 This is a structural block diagram of an electronic device according to an embodiment of the present application.

[0048] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0049] 1. First clutch; 2. First generator; 3. First power battery; 4. First drive motor; 5. Second clutch; 6. Third clutch; 7. Second generator; 8. Second power battery; 9. Second drive motor; 10. Fourth clutch; 11. Fifth clutch. DETAILED DESCRIPTION

[0050] The present application is further described in detail below in conjunction with the accompanying drawings.

[0051] like Figure 1 As shown, the embodiment of the present application provides a hybrid system based on battery internal resistance prediction, including an engine, a gearbox, a first drive motor 4, a first power battery 3, a first charging module, a PTO shaft and a CVT shaft. In this embodiment, the CVT shaft is used to transmit power to the vehicle's travel system to drive the vehicle forward, and the PTO shaft is used to transmit power to the loaded agricultural machinery.

[0052] The first power battery 3 is used to provide electrical energy to the first drive motor 4; the engine and / or the first drive motor 4 is used to transmit power to the gearbox and the PTO shaft, and the gearbox is used to transmit power to the CVT shaft.

[0053] In this embodiment, the gearbox can be a planetary gearbox. In the drive of the CVT shaft, the first drive motor 4 replaces the hydraulic pump-motor module in the conventional hydraulic mechanical continuously variable transmission tractor, so that the hybrid powertrain system has higher reliability and simpler maintenance.

[0054] Both the engine and the first drive motor 4 can be used as power sources to drive the gearbox and the PTO shaft, which can ensure that when a component in the drive path of the engine or the drive path of the first drive motor 4 fails, the other drive path can assist in the work, thereby improving the reliability of the tractor's operation and optimizing the economy and power of the tractor engine to a certain extent.

[0055] The first charging module is used to determine a first internal resistance corresponding to the first power battery 3 based on a first target corresponding relationship corresponding to the first power battery 3 and a current first state of charge, wherein the first target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the first power battery 3 and multiple internal resistances;

[0056] And, for judging, when the first power battery 3 is not charged, whether the first state of charge is a first SOC lower limit for maintaining the internal resistance at the lowest, based on the first state of charge and the first internal resistance; when the first power battery 3 is charged, judging, based on the first state of charge and the first internal resistance, whether the first state of charge is a first SOC upper limit for maintaining the internal resistance at the lowest; when the first power battery 3 is not charged, if the first state of charge is a first SOC lower limit for maintaining the internal resistance at the lowest, then controlling the first power battery 3 to start charging; when the first power battery 3 is charged, if the first state of charge is a first SOC upper limit for maintaining the internal resistance at the lowest, then controlling the first power battery 3 to stop charging; so that the first power battery 3 operates in the interval with the lowest internal resistance;

[0057] The first charging module is connected to the engine. When the first power battery 3 is charged, the first charging module is also used to generate electricity through the power transmitted by the engine to charge the first power battery 3 during driving.

[0058] State of charge (SOC) is a parameter used to reflect the remaining capacity of a power battery. It is numerically defined as the ratio of the remaining capacity to the battery capacity and can be expressed as a percentage. The SOC value range is 0~1. The SOC can be estimated by the power battery's terminal voltage, charge and discharge current, and internal resistance.

[0059] Through the correspondence between the first state of charge and the first target, it can be determined whether the first state of charge reaches the first start charging condition or the first stop charging condition. When the first power battery 3 is not charged and the first state of charge reaches the first start charging condition, the first charging module is controlled to start charging the first power battery 3; when the first power battery 3 is charged and the first state of charge reaches the first stop charging condition, the first charging module is controlled to stop charging the first power battery 3.

[0060] In this embodiment, the first charging start condition may be that the first state of charge is about to fall below a first SOC lower limit for maintaining the lowest internal resistance, and the first charging stop condition may be that the first state of charge is about to exceed a first SOC upper limit for maintaining the lowest internal resistance.

[0061] By controlling the charging state of the first power battery 3 according to the state of charge and the internal resistance, it is possible to ensure that the first power battery 3 operates in the range with the lowest internal resistance in real time, thereby slowing down the reduction of the life of the first power battery 3 and reducing the possibility of damage to the charging and discharging capacity.

[0062] In this embodiment, the first charging module is further used to determine the second internal resistance corresponding to the first power battery 3 based on the first target corresponding relationship and the second state of charge, and the second state of charge is the next state of charge corresponding to the current first state of charge; when the first power battery 3 is not charged, if the first internal resistance is within the interval of the lowest internal resistance, and the second internal resistance exceeds the interval of the lowest internal resistance, then the first state of charge is determined to be the first SOC lower limit for maintaining the internal resistance at the lowest; when the first power battery 3 is charged, if the first internal resistance is within the interval of the lowest internal resistance, and the second internal resistance exceeds the interval of the lowest internal resistance, then the first state of charge is determined to be the first SOC upper limit for maintaining the internal resistance at the lowest.

[0063] When the first power battery 3 is not charged, if the first internal resistance is within the interval of the lowest internal resistance and the second internal resistance exceeds the interval of the lowest internal resistance, it is determined that the first state of charge is the first SOC lower limit for maintaining the internal resistance at the lowest, and the second state of charge is lower than the first SOC lower limit for maintaining the internal resistance at the lowest, so that the first state of charge reaches the first charging start condition.

[0064] When the first power battery 3 is charged, if the first internal resistance is within the interval of the lowest internal resistance and the second internal resistance exceeds the interval of the lowest internal resistance, the first state of charge is the first SOC upper limit for maintaining the internal resistance at the lowest, and the second state of charge exceeds the first SOC upper limit for maintaining the internal resistance at the lowest, so that the second state of charge reaches the first charging stop condition.

[0065] By introducing the internal resistance prediction working mode based on power battery power monitoring, it can ensure that the first power battery 3 works in the range with the lowest internal resistance in real time, slowing down the reduction of the life of the first power battery 3 and reducing the possibility of damage to the charging and discharging capacity.

[0066] In this embodiment, the first charging module includes a first clutch 1 and a first generator 2. The output shaft of the engine can be connected to the first clutch 1 through a gear pair, the first clutch 1 is connected to the first generator 2, the first generator 2 is connected to the first power battery 3, and the engine can transmit power to the first clutch 1. When the first power battery 3 needs to be charged, the first clutch 1 is controlled to be engaged, the power provided by the engine drives the first generator 2 to generate electricity, and the first power battery 3 is charged by the electric energy generated by the first generator 2; when the first power battery 3 does not need to be charged, the first clutch 1 is controlled to be disconnected.

[0067] The output shaft of the engine is connected to a second clutch 5, which is connected to a gear pair, through which the second clutch 5 is connected to the planetary gearbox. The second clutch 5 is also connected to a fifth clutch 11, which is connected to the PTO shaft through a gear pair.

[0068] When the second clutch 5 is engaged, the engine can transmit power to the planetary gearbox through the second clutch 5. When both the second clutch 5 and the fifth clutch 11 are engaged, the engine can transmit power to the PTO shaft.

[0069] The output end of the first drive motor 4 is connected to a gear pair and a fourth clutch 10. The fourth clutch 10 is connected to the fifth clutch 11 through a gear pair. The gear pair corresponding to the first drive motor 4 is also connected to the planetary gearbox.

[0070] When the second clutch 5 is engaged, the first drive motor 4 and the engine can provide power to the planetary gear transmission, thereby meeting the degree of freedom requirement of the planetary gear transmission.

[0071] The planetary gear transmission includes a fixing device at the planetary gear. When the second clutch 5 is disconnected, the degree of freedom can be limited by the fixing device. The first drive motor 4 can provide power for the planetary gear transmission to achieve normal operation of the planetary gear transmission.

[0072] When the second clutch 5 , the fourth clutch 10 and the fifth clutch 11 are all engaged, the first drive motor 4 and the engine can provide power to the PTO shaft.

[0073] In this embodiment, the system further includes a second drive motor 9 and a second power battery 8; the second power battery 8 is used to provide electrical energy to the second drive motor 9; the second drive motor 9 is used to transmit power to the CVT shaft.

[0074] Both the engine and the second drive motor 9 can be used as the power source of the vehicle's travel system, so that the travel end (CVT) and the PTO end are equipped with separate drive motor controls. When the engine performance is poor, the first drive motor 4 can be directly used to drive the PTO end, and the second drive motor 9 can be used to drive the travel end, so that the starting speed can be improved at the stage when the engine just starts to work. At the same time, it can be ensured that when a component in the drive path of the engine or the drive path of the second drive motor 9 fails, the drive path of another gearbox can assist in the work, thereby improving the reliability of the tractor's work and optimizing the economy and power of the tractor engine to a certain extent.

[0075] In this embodiment, the system further includes a second charging module, the second charging module being configured to determine a third internal resistance corresponding to the second power battery 8 based on a second target corresponding relationship corresponding to the second power battery 8 and a current third state of charge, wherein the second target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the second power battery 8 and multiple internal resistances;

[0076] And, for judging, when the second power battery 8 is not charged, based on the third state of charge and the third internal resistance, whether the third state of charge is a second SOC lower limit for keeping the internal resistance at the lowest; when the second power battery 8 is charged, judging, based on the third state of charge and the third internal resistance, whether the third state of charge is a second SOC upper limit for keeping the internal resistance at the lowest; when the second power battery 8 is not charged, if the third state of charge is the second SOC lower limit for keeping the internal resistance at the lowest, then controlling the second power battery 8 to start charging; when the second power battery 8 is charged, if the third state of charge is the second SOC upper limit for keeping the internal resistance at the lowest, then controlling the second power battery 8 to stop charging; so that the second power battery 8 operates in the interval with the lowest internal resistance;

[0077] The second charging module is connected to the engine. When the second power battery 8 is charged, the second charging module is also used to generate electricity through the power transmitted by the engine to charge the second power battery 8 during driving.

[0078] Through the correspondence between the third state of charge and the second target, it can be determined whether the third state of charge reaches the second start charging condition or the second stop charging condition. When the second power battery 8 is not charged and the third state of charge reaches the second start charging condition, the second charging module is controlled to start charging the second power battery 8; when the second power battery 8 is charged and the third state of charge reaches the second stop charging condition, the second charging module is controlled to stop charging the second power battery 8.

[0079] In this embodiment, the second charging start condition may be that the third state of charge is about to fall below a second SOC lower limit for maintaining the lowest internal resistance, and the second charging stop condition may be that the third state of charge is about to exceed a second SOC upper limit for maintaining the lowest internal resistance.

[0080] By controlling the charging state of the second power battery 8 according to the state of charge and the internal resistance, it is possible to ensure that the second power battery 8 operates in the range with the lowest internal resistance in real time, thereby slowing down the decline in the life of the second power battery 8 and reducing the possibility of damage to the charging and discharging capabilities.

[0081] In this embodiment, the second charging module is further used to determine the fourth internal resistance corresponding to the second power battery 8 based on the second target corresponding relationship and the fourth state of charge, and the fourth state of charge is the next state of charge corresponding to the current third state of charge; when the second power battery 8 is not charged, if the third internal resistance is within the interval of the lowest internal resistance, and the fourth internal resistance exceeds the interval of the lowest internal resistance, then the third state of charge is determined to be the second SOC lower limit for maintaining the internal resistance at the lowest; when the second power battery 8 is charged, if the third internal resistance is within the interval of the lowest internal resistance, and the fourth internal resistance exceeds the interval of the lowest internal resistance, then the third state of charge is determined to be the second SOC upper limit for maintaining the internal resistance at the lowest.

[0082] When the second power battery 8 is not charged, if the third internal resistance is within the interval of the lowest internal resistance and the fourth internal resistance exceeds the interval of the lowest internal resistance, it is determined that the third state of charge is the second SOC lower limit for maintaining the internal resistance at the lowest, and the fourth state of charge is lower than the second SOC lower limit for maintaining the internal resistance at the lowest, so that the third state of charge reaches the second charging start condition.

[0083] When the second power battery 8 is charging, if the third internal resistance is within the interval of the lowest internal resistance and the fourth internal resistance exceeds the interval of the lowest internal resistance, the third state of charge is the second SOC upper limit for maintaining the internal resistance at the lowest, and the fourth state of charge exceeds the second SOC upper limit for maintaining the internal resistance at the lowest, so that the third state of charge reaches the second charging stop condition.

[0084] The first target correspondence relationship and the second target correspondence relationship can both be derived from the constructed neural network prediction model. By introducing the internal resistance prediction working mode based on power battery power monitoring, it can be ensured that the second power battery 8 works in the range with the lowest internal resistance in real time, which slows down the decline in the life of the second power battery 8 and reduces the possibility of damage to the charging and discharging capacity.

[0085] In this embodiment, the second charging module includes a third clutch 6 and a second generator 7. The output shaft of the engine can be connected to the third clutch 6 through a gear pair, the third clutch 6 is connected to the second generator 7, the second generator 7 is connected to the second power battery 8, and the engine can transmit power to the third clutch 6. When the second power battery 8 needs to be charged, the third clutch 6 is controlled to be engaged, the power provided by the engine drives the second generator 7 to generate electricity, and the second power battery 8 is charged by the electric energy generated by the second generator 7; when the second power battery 8 does not need to be charged, the third clutch 6 is controlled to be disconnected.

[0086] When the engine enters the cold start or idling working state, the deterioration of combustion will lead to the reduction of its power and emission performance. Therefore, it is necessary to disconnect the second clutch 5 at this time, cut off the connection between the engine and the planetary gear transmission and the PTO shaft, control the first clutch 1, the fourth clutch 10 and the fifth clutch 11 to engage, the engine drives the first generator 2 to charge the first power battery 3, the first power battery 3 supplies power to the first drive motor 4, the first drive motor 4 can provide power to the PTO shaft and the planetary gear transmission, so that the first drive motor 4 participates in the driving of the CVT shaft; control the third clutch 6 to engage, the engine drives the second generator 7 to charge the second power battery 8, the second power battery 8 supplies power to the second drive motor 9, and the second drive motor 9 can provide power to the CVT shaft; thereby realizing the direct driving of the vehicle by the first drive motor 4 and the second drive motor 9.

[0087] As an optional implementation of this embodiment, the engine speed can be collected in real time by an engine speed sensor, and it can be determined whether the engine speed is less than a specific speed threshold (for example, 800r / min). When it is detected that the engine speed is lower than the speed threshold, the second clutch 5 is disconnected and the engine enters the idle / cold start working state.

[0088] It is easy to understand that when the engine enters the idle / cold start working state and the first charge state reaches the first stop charging condition, the first clutch 1 can be controlled to disconnect; when the engine enters the idle / cold start working state and the third charge state reaches the second stop charging condition, the third clutch 6 is controlled to disconnect.

[0089] When the speed change of the vehicle is within the preset speed range, that is, the speed of the vehicle tends to be stable, the vehicle enters a normal working state. In order to avoid the excess energy consumption from the engine to the first drive motor 4, the connection between the engine and the first clutch 1 can be disconnected, at which time the first power battery 3 can supply power to the first drive motor 4, and the second clutch 5, the fourth clutch 10 and the fifth clutch 11 are controlled to engage, and the PTO shaft can be driven by the engine and the first drive motor 4. The third clutch 6 is controlled to engage, the engine drives the second generator 7 to charge the second power battery 8, the second power battery 8 supplies power to the second drive motor 9, and the second drive motor 9 can provide power to the CVT shaft.

[0090] Based on the same technical concept, the embodiment of the present application also provides a control method of a hybrid system based on battery internal resistance prediction, which can be executed by a device, which can be a server or a terminal device, wherein the server can be an independent physical server, a server cluster or a distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. The terminal device can be a tablet computer, a desktop computer, etc., but is not limited thereto.

[0091] A control method for a hybrid system based on battery internal resistance prediction, with an electronic device as the execution subject, such as Figure 2 As shown, the main process of the method is described as follows (steps S101 to S104):

[0092] Step S101: obtaining a current first state of charge corresponding to a first power battery;

[0093] Step S102: acquiring a first target corresponding relationship corresponding to the first power battery, and determining a first internal resistance corresponding to the first power battery, wherein the first target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the first power battery and multiple internal resistances;

[0094] Step S103: when the first power battery is not charged, judging whether the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum based on the first state of charge and the first internal resistance; when the first power battery is not charged, if the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum, controlling the first power battery to start charging;

[0095] Step S104: when the first power battery is charged, based on the first state of charge and the first internal resistance, determine whether the first state of charge is a first SOC upper limit for maintaining the internal resistance at a minimum; when the first power battery is charged, if the first state of charge is a first SOC upper limit for maintaining the internal resistance at a minimum, control the first power battery to stop charging.

[0096] like Figure 3 As shown, in this embodiment, the method further includes the following processing:

[0097] Step S201: obtaining a current third state of charge corresponding to a second power battery;

[0098] Step S202: obtaining a second target corresponding relationship corresponding to the second power battery, and determining a third internal resistance corresponding to the second power battery, wherein the second target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the second power battery and multiple internal resistances;

[0099] Step S203: when the second power battery is not charged, judging whether the third state of charge is a second SOC lower limit for maintaining the internal resistance as the lowest based on the third state of charge and the third internal resistance; when the second power battery is not charged, if the third state of charge is a second SOC lower limit for maintaining the internal resistance as the lowest, controlling the second power battery to start charging;

[0100] Step S204: when the second power battery is charged, based on the third state of charge and the third internal resistance, determine whether the third state of charge is a second SOC upper limit for maintaining the internal resistance at a minimum; when the second power battery is charged, if the third state of charge is a second SOC upper limit for maintaining the internal resistance at a minimum, control the second power battery to stop charging.

[0101] In this embodiment, the method for constructing the neural network prediction model includes:

[0102] Acquire historical operating data of the vehicle, and divide the historical operating data into a training data set, a verification data set, and a test data set, wherein the historical operating data includes a plurality of power battery internal resistances and a state of charge corresponding to each of the power battery internal resistances;

[0103] Constructing an initial neural network model, training the initial neural network model using the training data set, and adjusting network parameters through a back propagation algorithm to obtain a trained neural network model;

[0104] The trained neural network model is verified and evaluated using the verification data set and the test data set. If the verification and evaluation pass, the trained neural network model is used as the neural network prediction model.

[0105] By selecting a suitable neural network type, an initial neural network model is obtained. For example, the suitable neural network type may be a recurrent neural network, a multi-layer perceptron, etc. The initial neural network model includes an input side, a hidden layer, and an output layer. The input layer may be a series of SOCs used for training in the training data set, and the output side may be a series of internal resistances of power batteries used for training in the training data set. The number of hidden layers may be determined by cross-validation of the data. Since the system only involves SOC, the number of output layers is 1. The hidden layer contains some nonlinear transformations for nonlinear transformation and feature extraction of the input layer data.

[0106] Select the corresponding activation function to introduce nonlinear factors, and use the corresponding algorithm (such as gradient descent method) to minimize the error. Use the training set data to train the initial neural network model, and adjust the network parameters through the back propagation algorithm. During the training process, you can monitor the changes in the loss function and the prediction performance on the validation set to avoid overfitting.

[0107] In this embodiment, the method also includes the following processing: acquiring the engine speed in real time; if the engine speed is lower than a preset speed threshold, controlling the engine not to transmit power to the PTO shaft and the CVT shaft, controlling the first drive motor to transmit power to the PTO shaft, and controlling the second drive motor to transmit power to the CVT shaft.

[0108] In this embodiment, after the real-time acquisition of the engine speed, the following processing is also included: based on the engine speed, if the speed change of the vehicle is within a preset speed range, the engine is controlled to transmit power to the PTO shaft, and the engine and the second drive motor are controlled to transmit power to the CVT shaft.

[0109] Based on the same technical concept, the present application also provides a control device for a hybrid system based on battery internal resistance prediction, such as Figure 4 As shown, the control device 200 of the hybrid system based on battery internal resistance prediction mainly includes:

[0110] A first acquisition module 201 is used to acquire a current first state of charge corresponding to a first power battery;

[0111] A first determining module 202, configured to obtain a first target corresponding relationship corresponding to the first power battery, and determine a first internal resistance corresponding to the first power battery, wherein the first target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the first power battery and multiple internal resistances;

[0112] A first charging start module 203 is used to determine, when the first power battery is not charged, based on the first state of charge and the first internal resistance, whether the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum; when the first power battery is not charged, if the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum, control the first power battery to start charging;

[0113] The first charging stop module 204 is used to determine whether the first state of charge is a first SOC upper limit for maintaining the internal resistance at a minimum based on the first state of charge and the first internal resistance when the first power battery is being charged; when the first power battery is being charged, if the first state of charge is a first SOC upper limit for maintaining the internal resistance at a minimum, then control the first power battery to stop charging.

[0114] Optionally, the device further comprises:

[0115] A second acquisition module, used to acquire a current third state of charge corresponding to the second power battery;

[0116] a second determining module, configured to obtain a second target corresponding relationship corresponding to the second power battery, and determine a third internal resistance corresponding to the second power battery, wherein the second target corresponding relationship is a corresponding relationship between multiple charge states and multiple internal resistances corresponding to the second power battery;

[0117] a second charging start module, configured to, when the second power battery is not charged, determine, based on the third state of charge and the third internal resistance, whether the third state of charge is a second SOC lower limit for maintaining the internal resistance as the lowest; and, when the second power battery is not charged, if the third state of charge is a second SOC lower limit for maintaining the internal resistance as the lowest, control the second power battery to start charging;

[0118] The second charging stop module is used to determine whether the third state of charge is a second SOC upper limit for keeping the internal resistance as the lowest when the second power battery is charged, based on the third state of charge and the third internal resistance; when the second power battery is charged, if the third state of charge is a second SOC upper limit for keeping the internal resistance as the lowest, then control the second power battery to stop charging.

[0119] Optionally, the device further comprises:

[0120] The first vehicle speed control module is used to obtain the engine speed in real time; if the engine speed is lower than a preset speed threshold, the engine is controlled not to transmit power to the PTO shaft and the CVT shaft, the first drive motor is controlled to transmit power to the PTO shaft, and the second drive motor is controlled to transmit power to the CVT shaft.

[0121] Optionally, after the first vehicle speed control module, it also includes:

[0122] The second vehicle speed control module is used to control the engine to transmit power to the PTO shaft and control the engine and the second drive motor to transmit power to the CVT shaft based on the engine speed if the vehicle speed change is within a preset speed range.

[0123] In one example, the module in any of the above devices can be one or more integrated circuits configured to implement the above methods, such as: one or more application specific integrated circuits (ASICs), or, one or more digital signal processors (DSPs), or, one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms.

[0124] For another example, when the modules in the device can be implemented in the form of a processing element scheduling program, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call a program. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0125] Various objects such as various messages / information / equipment / network elements / systems / devices / actions / operations / processes / concepts that may appear in this application are named. It can be understood that these specific names do not constitute a limitation on the relevant objects. The names assigned may change with factors such as scenarios, contexts or usage habits. The understanding of the technical meaning of the technical terms in this application should be mainly determined from the functions and technical effects embodied / executed in the technical scheme.

[0126] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0127] Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0128] Based on the same technical concept, the present application also provides an electronic device, such as Figure 5 As shown, the electronic device 300 includes a processor 301 and a memory 302 , and may further include an information input / information output (I / O) interface 303 , one or more of a communication component 304 , and a communication bus 305 .

[0129] The processor 301 is used to control the overall operation of the electronic device 300 to complete all or part of the steps in the control method of the hybrid system based on the prediction of the internal resistance of the battery; the memory 302 is used to store various types of data to support the operation of the electronic device 300, and the data may include instructions for any application or method used to operate on the electronic device 300, and data related to the application. The memory 302 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, disk or optical disk.

[0130] The I / O interface 303 provides an interface between the processor 301 and other interface modules, and the above-mentioned other interface modules can be keyboards, mice, buttons, etc. These buttons can be virtual buttons or physical buttons. The communication component 304 is used to test the wired or wireless communication between the electronic device 300 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so the corresponding communication component 304 can include: Wi-Fi components, Bluetooth components, NFC components.

[0131] The communication bus 305 may include a path to transmit information between the above components. The communication bus 305 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The communication bus 305 may be divided into an address bus, a data bus, a control bus, etc.

[0132] The electronic device 300 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the control method of the hybrid system based on battery internal resistance prediction given in the above embodiment.

[0133] The electronic device 300 may include, but is not limited to, a mobile terminal such as a digital broadcast receiver, a PDA (Personal Digital Assistant), a PMP (Portable Multimedia Player), etc., and a fixed terminal such as a digital TV, a desktop computer, etc., and may also be a server, etc.

[0134] Based on the same technical concept, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned control method of the hybrid system based on battery internal resistance prediction are implemented.

[0135] The computer-readable storage medium may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0136] The terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0137] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0138] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0139] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A hybrid system based on battery internal resistance prediction, characterized in that: The invention comprises an engine, a gearbox, a first drive motor, a first power battery, a first charging module, a PTO shaft and a CVT shaft; the first power battery is used to provide electric energy to the first drive motor; the engine and / or the first drive motor are used to transmit power to the gearbox and the PTO shaft, and the gearbox is used to transmit power to the CVT shaft; the first charging module is configured to determine a first internal resistance corresponding to the first power battery based on a first target corresponding relationship corresponding to the first power battery and a current first state of charge, wherein the first target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the first power battery and multiple internal resistances; and, for determining, when the first power battery is not charged, based on the first state of charge and the first internal resistance, whether the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum; and for determining, when the first power battery is charged, based on the first state of charge and the first internal resistance, whether the first state of charge is a first SOC upper limit for maintaining the internal resistance at a minimum; When the first power battery is not charged, if the first state of charge is a first SOC lower limit for maintaining the lowest internal resistance, the first power battery is controlled to start charging; when the first power battery is charged, if the first state of charge is a first SOC upper limit for maintaining the lowest internal resistance, the first power battery is controlled to stop charging; so that the first power battery operates in the interval with the lowest internal resistance; The first charging module is connected to the engine. When the first power battery is charged, the first charging module is also used to generate electricity through the power transmitted by the engine to charge the first power battery during driving.

2. A hybrid system based on battery internal resistance prediction according to claim 1, characterized in that: The first charging module is further used to determine a second internal resistance corresponding to the first power battery based on the first target corresponding relationship and the second state of charge, the second state of charge being a next state of charge corresponding to the current first state of charge; when the first power battery is not charged, if the first internal resistance is within the interval of lowest internal resistance and the second internal resistance exceeds the interval of lowest internal resistance, then the first state of charge is determined to be a first SOC lower limit for maintaining the internal resistance at the lowest; when the first power battery is being charged, if the first internal resistance is within the interval of lowest internal resistance and the second internal resistance exceeds the interval of lowest internal resistance, then the first state of charge is determined to be a first SOC upper limit for maintaining the internal resistance at the lowest.

3. A hybrid system based on battery internal resistance prediction according to claim 1, characterized in that: The system further includes a second drive motor and a second power battery; the second power battery is used to provide electrical energy to the second drive motor; the second drive motor is used to transmit power to the CVT shaft; The system further includes a second charging module, the second charging module being configured to determine a third internal resistance corresponding to the second power battery based on a second target corresponding relationship corresponding to the second power battery and a current third state of charge, wherein the second target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the second power battery and multiple internal resistances; and, when the second power battery is not charged, judging, based on the third state of charge and the third internal resistance, whether the third state of charge is a second SOC lower limit for maintaining the internal resistance at a minimum; When the second power battery is charged, judging whether the third state of charge is a second SOC upper limit for maintaining the internal resistance at a minimum based on the third state of charge and the third internal resistance; When the second power battery is not charged, if the third state of charge is a second SOC lower limit for maintaining the internal resistance at the lowest, then the second power battery is controlled to start charging; when the second power battery is charged, if the third state of charge is a second SOC upper limit for maintaining the internal resistance at the lowest, then the second power battery is controlled to stop charging; so that the second power battery operates in the interval with the lowest internal resistance; The second charging module is connected to the engine. When the second power battery is charged, the second charging module is also used to generate electricity through the power transmitted by the engine to charge the second power battery during driving.

4. A control method for a hybrid system based on battery internal resistance prediction, characterized in that: include: Obtaining a current first state of charge corresponding to the first power battery; Acquire a first target corresponding relationship corresponding to the first power battery, and determine a first internal resistance corresponding to the first power battery, wherein the first target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the first power battery and multiple internal resistances; When the first power battery is not charged, judging whether the first state of charge is a first SOC lower limit for maintaining the internal resistance as the lowest based on the first state of charge and the first internal resistance; when the first power battery is not charged, if the first state of charge is a first SOC lower limit for maintaining the internal resistance as the lowest, controlling the first power battery to start charging; When the first power battery is charged, judging whether the first state of charge is a first SOC upper limit that keeps the internal resistance at a minimum based on the first state of charge and the first internal resistance; When the first power battery is being charged, if the first state of charge is a first SOC upper limit that keeps the internal resistance at a minimum, the first power battery is controlled to stop charging.

5. The control method of a hybrid system based on battery internal resistance prediction according to claim 4, characterized in that: The method further comprises: Obtaining a current third state of charge corresponding to the second power battery; acquiring a second target corresponding relationship corresponding to the second power battery, and determining a third internal resistance corresponding to the second power battery, wherein the second target corresponding relationship is a corresponding relationship between multiple charge states and multiple internal resistances corresponding to the second power battery; When the second power battery is not charged, judging whether the third state of charge is a second SOC lower limit for maintaining the internal resistance as the lowest based on the third state of charge and the third internal resistance; when the second power battery is not charged, if the third state of charge is a second SOC lower limit for maintaining the internal resistance as the lowest, controlling the second power battery to start charging; When the second power battery is charged, based on the third state of charge and the third internal resistance, it is determined whether the third state of charge is a second SOC upper limit for maintaining the internal resistance as the lowest; when the second power battery is charged, if the third state of charge is a second SOC upper limit for maintaining the internal resistance as the lowest, the second power battery is controlled to stop charging.

6. A control method for a hybrid system based on battery internal resistance prediction according to claim 4 or 5, characterized in that: The method further comprises: Get engine speed in real time; If the engine speed is lower than a preset speed threshold, the engine is controlled not to transmit power to the PTO shaft and the CVT shaft, the first drive motor is controlled to transmit power to the PTO shaft, and the second drive motor is controlled to transmit power to the CVT shaft.

7. The control method of a hybrid system based on battery internal resistance prediction according to claim 6, characterized in that: After the real-time acquisition of the engine speed, the method further includes: Based on the engine speed, if the speed change of the vehicle is within a preset speed range, the engine is controlled to transmit power to the PTO shaft, and the engine and the second drive motor are controlled to transmit power to the CVT shaft.

8. A control device for a hybrid system based on battery internal resistance prediction, characterized in that: include: A first acquisition module, used to acquire a current first state of charge corresponding to a first power battery; a first determining module, configured to obtain a first target corresponding relationship corresponding to the first power battery, and determine a first internal resistance corresponding to the first power battery, wherein the first target corresponding relationship is a corresponding relationship between multiple states of charge corresponding to the first power battery and multiple internal resistances; a first charging start module, configured to, when the first power battery is not charged, determine, based on the first state of charge and the first internal resistance, whether the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum; when the first power battery is not charged, if the first state of charge is a first SOC lower limit for maintaining the internal resistance at a minimum, control the first power battery to start charging; a first charging stop module, configured to determine, when the first power battery is being charged, based on the first state of charge and the first internal resistance, whether the first state of charge is a first SOC upper limit for maintaining the internal resistance at a minimum; When the first power battery is being charged, if the first state of charge is a first SOC upper limit that keeps the internal resistance at a minimum, the first power battery is controlled to stop charging.

9. An electronic device, characterized in that: comprising a processor and a memory, wherein the processor is coupled to the memory; The processor is configured to execute a computer program stored in the memory, so that the electronic device executes the method according to any one of claims 4 to 7.

10. A computer-readable storage medium, characterized in that: The method comprises a computer program or an instruction, which, when executed on a computer, causes the computer to execute the method according to any one of claims 4 to 7.

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