Double-motor electric drive axle vehicle control method and system

Abstract

The embodiment of the invention discloses a double-motor electric drive axle vehicle control method and system. The double-motor electric drive axle vehicle control method comprises the steps that accelerator pedal opening degree information, vehicle speed information, acceleration information, battery electric quantity information and load weight information are collected in real time; according to the accelerator pedal opening degree information, the vehicle speed information, the acceleration information, the battery electric quantity information and the load weight information and a pre-established multi-parameter complex working condition judgment model, the current working mode of the vehicle is determined; and according to the current working mode of the vehicle, the working state of at least one of the engine and the two motors is adjusted in real time. According to the control method, various working condition factors can be comprehensively considered, efficient operation of the double-motor electric drive axle vehicle in various modes is accurately controlled, the double-motor electric drive axle vehicle can be kept in the optimal working state in the whole scene, the power performance and the cruising ability of the vehicle are improved, energy consumption is reduced, and the service life of the vehicle is prolonged. And the requirements of the heavy-duty commercial vehicle in diversified application scenes such as logistics transportation and engineering operation are met.

Description

Technical Field

[0001] The embodiments of the present invention relate to vehicle control technology, and more particularly to a dual-motor electric drive axle vehicle control method and system. Background Art

[0002] In the field of commercial vehicle power control, vehicle control technology is the basis for ensuring the normal operation of the vehicle and can improve vehicle operating efficiency and energy utilization. However, with the tightening of environmental protection regulations and the continuous improvement of energy conservation and emission reduction requirements, traditional power control methods can no longer meet the needs.

[0003] Many commercial vehicles have relatively simple power control strategies, with some vehicles only able to achieve basic power output and lacking precise adaptation to complex operating conditions. For example, in congested urban traffic conditions, braking energy cannot be effectively recovered, resulting in energy waste. In conditions such as heavy-load climbing, power distribution is irrational, causing the engine to operate at high loads and significantly increasing fuel consumption. Although some vehicles have multiple operating modes, the mode switching logic is simple, often switching based on only a few parameters such as vehicle speed or accelerator pedal opening, without comprehensively considering factors such as the vehicle's battery level, load weight, and acceleration. As a result, the vehicle cannot always maintain optimal energy consumption. For dual-motor electric drive axle vehicles, existing control methods have shortcomings. They do not fully utilize the synergistic advantages of the dual motors, lack efficient strategies for the coordination of the engine and motor, and cannot achieve optimal performance of the power system. Most control methods do not optimize energy utilization under special operating conditions such as parking. Summary of the Invention

[0004] The present invention proposes a control method and system for a dual-motor electric-drive axle vehicle. This control method can comprehensively consider various working conditions and accurately control the efficient operation of the dual-motor electric-drive axle vehicle in multiple modes, so that it can maintain the best working state in all scenarios, improve the vehicle's power performance and endurance, reduce energy consumption, and meet the needs of heavy-duty commercial vehicles in diverse application scenarios such as logistics transportation and engineering operations.

[0005] In a first aspect, an embodiment of the present invention provides a method for controlling a dual-motor electric drive axle vehicle, comprising:

[0006] Real-time collection of accelerator pedal opening information, vehicle speed information, acceleration information, battery power information and load weight information;

[0007] determining a current operating mode of the vehicle based on the accelerator pedal opening information, the vehicle speed information, the acceleration information, the battery power information, and the load weight information, as well as a pre-established multi-parameter complex operating condition determination model;

[0008] According to the current working mode of the vehicle, the working state of the engine and at least one of the two motors is adjusted in real time.

[0009] Optionally, the operating mode of the vehicle includes a pure electric mode;

[0010] According to the current operating mode of the vehicle, adjusting the operating state of the engine and at least one of the two motors in real time includes:

[0011] When the current operating mode of the vehicle is the pure electric mode, calculating a requested total tractive force of the vehicle according to the accelerator pedal opening information, the vehicle speed information, and the load weight information, and converting the calculated total tractive force into a requested torque of the vehicle;

[0012] According to the requested torque of the vehicle, the output torque of the two motors is distributed and controlled and outputted to the outside.

[0013] Optionally, the pure electric mode includes a single motor mode and a dual motor mode; the two motors include a first motor and a second motor;

[0014] Before distributing and controlling the output torques of the two motors according to the requested torque of the vehicle and outputting the torques to the outside, the method further includes:

[0015] When the load weight information is less than a preset load weight threshold, the vehicle speed information is less than a preset vehicle speed threshold, and the battery power information is less than a first preset battery power threshold, determining that the vehicle is in a single-motor operating state;

[0016] When the load weight information is greater than or equal to a preset load weight threshold, or the vehicle speed information is greater than or equal to a preset vehicle speed threshold, or the battery power information is greater than or equal to a first preset battery power threshold, determining that the vehicle is in a dual-motor operating state;

[0017] Distributing and controlling the output torque of the two motors according to the requested torque of the vehicle and outputting the torque to the outside includes:

[0018] When the vehicle is in a single-motor operating state, controlling the first motor or the second motor to output torque according to a request of the vehicle;

[0019] When the vehicle is in a dual-motor operating state, the first motor is controlled to output a first torque, and the second motor is controlled to output a second torque; wherein the first torque is the optimal torque of the first motor at the current vehicle speed, and the second torque is the difference between the requested torque of the vehicle and the first torque.

[0020] Optionally, the operating mode of the vehicle includes a hybrid mode;

[0021] According to the current operating mode of the vehicle, adjusting the operating state of the engine and at least one of the two motors in real time includes:

[0022] When the current operating mode of the vehicle is the hybrid mode, calculating a requested total tractive force of the vehicle according to the accelerator pedal opening information, the vehicle speed information, and the load weight information, and converting the calculated total tractive force into a requested torque of the vehicle;

[0023] According to the requested torque of the vehicle, the output torque of the engine and one of the motors is distributed and controlled and outputted to the outside.

[0024] Optionally, the hybrid mode includes a rapid acceleration condition and a stable driving condition; the two motors include a first motor and a second motor;

[0025] Before distributing and controlling the output torque of the engine and one of the motors according to the requested torque of the vehicle and outputting the torque to the outside, the method further includes:

[0026] Calculating the accelerator pedal's pedaling speed based on the accelerator pedal opening information;

[0027] When the pedal speed of the accelerator pedal is greater than a preset pedal speed threshold, determining that the vehicle is in a rapid acceleration condition;

[0028] When the pedal speed of the accelerator pedal is less than or equal to a preset pedal speed threshold, determining that the vehicle is in a stable driving condition;

[0029] The method distributes and controls the output torque of the engine and one of the motors according to the requested torque of the vehicle and outputs the torque to the outside, including:

[0030] When the vehicle is in a rapid acceleration condition, controlling the engine to output at the maximum engine torque, and controlling the first motor or the second motor to output at the maximum motor torque;

[0031] When the vehicle is in a stable driving condition, the engine is controlled to output a third torque, and the first motor is controlled to output a fourth torque; wherein the third torque is the optimal torque of the engine within the economic fuel zone at the current vehicle speed, and the fourth torque is the difference between the vehicle requested torque and the third torque.

[0032] Optionally, calculating the requested total tractive force of the vehicle according to the accelerator pedal opening information, the vehicle speed information, and the load weight information, and converting the calculated total tractive force into the requested torque of the vehicle, includes:

[0033] The requested total traction force of the vehicle is calculated and converted into the requested torque of the vehicle according to the formula F=k1*P+k2*(1 / V)+k3*m; wherein P is the accelerator pedal opening information, V is the vehicle speed information, m is the load weight information, and k1, k2, and k3 are all set parameters.

[0034] Optionally, the operating mode of the vehicle includes a parking power generation mode;

[0035] According to the current operating mode of the vehicle, adjusting the operating state of the engine and at least one of the two motors in real time includes:

[0036] When the current working mode of the vehicle is the parking power generation mode, the engine is controlled to drive at least one of the two motors to generate electricity and charge the battery until the power of the battery reaches a second preset battery power threshold.

[0037] Optionally, the operating mode of the vehicle includes an energy recovery mode;

[0038] According to the current operating mode of the vehicle, adjusting the operating state of the engine and at least one of the two motors in real time includes:

[0039] When the current working mode of the vehicle is the energy recovery mode,

[0040] When the battery charge is within a preset charge range, at least one of the two motors is controlled to generate electricity according to a target power generation power by converting wheel kinetic energy, and charge the battery; wherein the target power generation power is negatively correlated with the battery charge within the preset charge range.

[0041] Optionally, the target power generation power range is 0-100%, and the target power generation power is inversely proportional to the power level of the battery within the preset power level range of the battery.

[0042] In a second aspect, an embodiment of the present invention further provides a dual-motor electric drive axle vehicle control system, including any of the dual-motor electric drive axle vehicle control methods described above.

[0043] An embodiment of the present invention provides a control method for a dual-motor electric-drive axle vehicle. This method collects real-time information about the accelerator pedal position, vehicle speed, acceleration, battery charge, and load weight, and applies a multi-parameter complex operating condition determination model to determine the vehicle's current operating mode and adjust the operating state of the engine and at least one of the two motors in real time. This control method comprehensively considers various operating conditions to precisely control the efficient operation of a dual-motor electric-drive axle vehicle in multiple modes, maintaining optimal operating conditions in all scenarios. This method improves the vehicle's power performance and endurance, reduces energy consumption, and meets the needs of heavy-duty commercial vehicles in diverse application scenarios such as logistics and engineering operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a flow chart of a dual-motor electric drive axle vehicle control method provided by an embodiment of the present invention;

[0045] Figure 2 This is a flow chart of another pure electric mode control method for a dual-motor electric drive axle vehicle provided by an embodiment of the present invention;

[0046] Figure 3 This is a flow chart of another hybrid mode control method for a dual-motor electric drive axle vehicle provided by an embodiment of the present invention;

[0047] Figure 4 This is a flow chart of another method for controlling a parking power generation mode of a dual-motor electric drive axle vehicle provided by an embodiment of the present invention;

[0048] Figure 5 This is a flow chart of another method for controlling the energy recovery mode of a dual-motor electric drive axle vehicle provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0050] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present invention are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is formed "on" or "under" another element, it can not only be formed directly "on" or "under" another element, but can also be formed indirectly "on" or "under" another element through an intermediate element. The terms "first", "second", etc. are only used for descriptive purposes and do not indicate any order, quantity or importance, but are only used to distinguish different components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The term "including" and its variations used in the present invention are open inclusions, that is, "including but not limited to." The term "based on" means "based at least in part on." The term "one embodiment" means "at least one embodiment."

[0052] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish the corresponding contents, and are not used to limit the order or mutual dependence.

[0053] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0054] Figure 1 This is a flow chart of a dual-motor electric drive axle vehicle control method provided by an embodiment of the present invention, refer to Figure 1 , the dual-motor electric drive axle vehicle control method includes:

[0055] S110 , collecting accelerator pedal opening information, vehicle speed information, acceleration information, battery power information, and load weight information in real time.

[0056] Among them, the accelerator pedal opening information refers to the depth ratio of the driver's stepping on the accelerator pedal, which reflects the driver's driving intention. For example, deep stepping on the accelerator represents acceleration demand, and shallow stepping on the accelerator represents smooth driving. It can be detected in real time through the position sensor at the accelerator pedal shaft; vehicle speed information refers to the current driving speed of the vehicle, which can be detected by the wheel speed sensor; acceleration information refers to the speed change of the vehicle per unit time, reflecting the acceleration or deceleration trend of the vehicle, which can be detected by the acceleration sensor; battery power information refers to the percentage of remaining battery power, which can be obtained through the battery management system; load weight information refers to the total weight currently carried by the vehicle. The larger the load, the higher the power demand, which can be detected by the pressure sensor. Different parameters can perceive the real-time status of the vehicle in many aspects.

[0057] S120 , determining the current operating mode of the vehicle based on the accelerator pedal opening information, vehicle speed information, acceleration information, battery charge information, and load weight information, as well as a pre-established multi-parameter complex operating condition determination model.

[0058] The present invention pre-establishes a multi-parameter complex operating condition determination model. This model sets thresholds and assigns weight coefficients to each of the accelerator pedal opening, vehicle speed, acceleration, battery charge, and load weight information. This model then determines whether the parameters have reached their thresholds. Combined with logical operations, it accurately determines the operating condition and the vehicle's current operating mode. This multi-parameter complex operating condition determination model is an intelligent decision-making model based on multi-dimensional input parameters, providing a basis for decision-making when switching between vehicle operating modes.

[0059] S130: Adjust the operating state of the engine and at least one of the two motors in real time according to the current operating mode of the vehicle.

[0060] Among them, according to the working mode determined by the multi-parameter complex working condition judgment model, the working status of the engine and at least one of the two motors is adjusted in real time, so that the vehicle can always maintain the best working state under different working conditions and maximize efficiency.

[0061] An embodiment of the present invention provides a control method for a dual-motor electric-drive axle vehicle. This method collects real-time information about the accelerator pedal position, vehicle speed, acceleration, battery charge, and load weight, and applies a multi-parameter complex operating condition determination model to determine the vehicle's current operating mode and adjust the operating state of the engine and at least one of the two motors in real time. This control method comprehensively considers various operating conditions to precisely control the efficient operation of a dual-motor electric-drive axle vehicle in multiple modes, maintaining optimal operating conditions in all scenarios. This method improves the vehicle's power performance and endurance, reduces energy consumption, and meets the needs of heavy-duty commercial vehicles in diverse application scenarios such as logistics and engineering operations.

[0062] As in the above embodiment, the vehicle's operating mode may specifically include a pure electric mode. In view of this operating mode, the present invention further provides a pure electric mode control method for a dual-motor electric drive axle vehicle. Figure 2 This is another flow chart of a pure electric mode control method for a dual-motor electric drive axle vehicle provided by an embodiment of the present invention. Figure 2 This embodiment is an optimization based on the above embodiment. Specifically, according to the current working mode of the vehicle, the working state of the engine and at least one of the two motors is adjusted in real time. The specific details can be as follows:

[0063] When the vehicle's current operating mode is pure electric mode, the vehicle's requested total traction force is calculated based on accelerator pedal opening information, vehicle speed information, and load weight information, and converted into the vehicle's requested torque.

[0064] According to the vehicle's requested torque, the output torque of the two motors is distributed and controlled and output to the outside.

[0065] like Figure 2 As shown, the method may include the following steps:

[0066] S210: Collect accelerator pedal opening information, vehicle speed information, acceleration information, battery power information, and load weight information in real time.

[0067] S220: Determine the current operating mode of the vehicle based on the accelerator pedal opening information, vehicle speed information, acceleration information, battery charge information, and load weight information, as well as a pre-established multi-parameter complex operating condition determination model.

[0068] S230: Adjust the operating state of the engine and at least one of the two motors in real time according to the current operating mode of the vehicle.

[0069] S240: When the current operating mode of the vehicle is the pure electric mode, the requested total traction force of the vehicle is calculated based on the accelerator pedal opening information, the vehicle speed information, and the load weight information, and converted into the requested torque of the vehicle.

[0070] Pure electric mode refers to an operating mode in which the vehicle's propulsion is entirely provided by the electric motor, with the engine in a shutdown state. In pure electric mode, the vehicle's required traction is calculated based on a multi-parameter model by collecting information such as accelerator pedal position, vehicle speed, and load weight. This information is then converted into requested torque using a dynamic model.

[0071] Optionally, this step can be refined as follows:

[0072] The vehicle's requested total tractive force is calculated based on the accelerator pedal opening information, vehicle speed information, and load weight information, and converted into the vehicle's requested torque, including: calculating the vehicle's requested total tractive force and converting it into the vehicle's requested torque according to the formula F = k1*P + k2*(1 / V) + k3*m; where P is the accelerator pedal opening information, V is the vehicle speed information, m is the load weight information, and k1, k2, and k3 are all set parameters.

[0073] Total traction is the combined force that propels the vehicle forward, overcoming resistance. The formula F = k1*P + k2*(1 / V) + k3*m converts accelerator pedal position, vehicle speed, and load weight into specific power requirements, providing a quantitative basis for torque distribution between the engine and motor. The values of k1, k2, and k3 are determined by the vehicle type and application, as well as powertrain parameters. This traction calculation formula accurately quantifies the vehicle's power requirements, supporting torque distribution strategies in both pure electric and hybrid modes, and ultimately enabling precise control of the efficient operation of dual-motor electric drive axle vehicles in various modes.

[0074] S250 : Distribute and control the output torques of the two motors and output them to the outside according to the requested torque of the vehicle.

[0075] Among them, after calculating the total traction force requested by the vehicle according to the traction force calculation formula, the output torque of the two motors is distributed and controlled and output to the outside.

[0076] In pure electric mode, the power source of the motor is battery electricity. The engine does not participate in driving and no fuel is burned, thus achieving low energy consumption and zero emission operation.

[0077] Furthermore, in this embodiment of the present invention, the pure electric mode may include a single-motor mode and a dual-motor mode; the two motors may include a first motor and a second motor. Based on this, before the above S250, which distributes and controls the output torque of the two motors according to the vehicle's requested torque and outputs it externally, the following steps may be added:

[0078] When the load weight information is less than a preset load weight threshold, the vehicle speed information is less than a preset vehicle speed threshold, and the battery power information is less than a first preset battery power threshold, it is determined that the vehicle is in a single-motor operating state.

[0079] When the load weight information is greater than or equal to a preset load weight threshold, or the vehicle speed information is greater than or equal to a preset vehicle speed threshold, or the battery power information is greater than or equal to a first preset battery power threshold, it is determined that the vehicle is in a dual-motor operating state.

[0080] Among them, in pure electric mode, the system will intelligently switch between single-motor operating mode and dual-motor operating mode based on the values of load weight information, vehicle speed information and battery power information. When the load weight information is less than the preset load weight threshold, the vehicle speed information is less than the preset speed threshold and the battery power information is less than the first preset battery power threshold, that is, when the vehicle is in a light-load, low-speed and low-power operating condition, the vehicle is determined to be in single-motor operating mode; when the load weight information is greater than or equal to the preset load weight threshold, or the vehicle speed information is greater than or equal to the preset speed threshold, or the battery power information is greater than or equal to the first preset battery power threshold, that is, in scenarios requiring strong power such as heavy-load starting, rapid acceleration or high-speed driving, the vehicle is determined to be in dual-motor operating mode. The two working modes of single-motor operating mode and dual-motor operating mode can be applied to different driving scenarios of the vehicle to balance power performance and energy efficiency.

[0081] Based on this, S250 distributes and controls the output torque of the two motors and outputs it to the outside according to the vehicle's requested torque. This can be specifically broken down into the following steps:

[0082] When the vehicle is in a single-motor operating state, the first motor or the second motor is controlled to output torque according to the vehicle's requested torque.

[0083] Among them, when the vehicle is in a single-motor operating state, the engine is stopped, and the first motor or the second motor is controlled to output torque according to the vehicle's requested torque, thereby reducing energy consumption and extending the vehicle's cruising range.

[0084] When the vehicle is in a dual-motor operating state, the first motor is controlled to output according to the first torque, and the second motor is controlled to output according to the second torque; wherein the first torque is the optimal torque of the first motor at the current vehicle speed, and the second torque is the difference between the vehicle's requested torque and the first torque.

[0085] When the vehicle is in dual-motor operation and the engine is shut down, the first motor outputs its optimal torque at the current vehicle speed. Optimal torque is the torque output point at which the motor achieves peak energy conversion efficiency and minimizes energy consumption. Internal motor losses are minimized, and the ratio of power output to input is maximized, representing optimal energy utilization. The remaining requested torque is supplied by the second motor. The first and second motors work together to deliver energy, ensuring vehicle performance and maximizing energy utilization.

[0086] As in the above embodiment, the vehicle's operating mode may specifically include a hybrid mode. In response to this operating mode, the present invention further provides a hybrid mode control method for a dual-motor electric drive axle vehicle. Figure 3 This is another flow chart of a dual-motor electric drive axle vehicle hybrid mode control method provided by an embodiment of the present invention. Figure 3This embodiment is an optimization based on the above embodiment. Specifically, according to the current working mode of the vehicle, the working state of the engine and at least one of the two motors is adjusted in real time. The specific details can be as follows:

[0087] When the current operating mode of the vehicle is the hybrid mode, the requested total tractive force of the vehicle is calculated based on the accelerator pedal opening information, the vehicle speed information, and the load weight information, and is converted into the requested torque of the vehicle.

[0088] Based on the vehicle's requested torque, the output torque of the engine and one of the motors is distributed and controlled and output to the outside.

[0089] like Figure 3 As shown, the method may include the following steps:

[0090] S310: Collect accelerator pedal opening information, vehicle speed information, acceleration information, battery power information, and load weight information in real time.

[0091] S320: Determine the current operating mode of the vehicle based on the accelerator pedal opening information, vehicle speed information, acceleration information, battery charge information, and load weight information, as well as a pre-established multi-parameter complex operating condition determination model.

[0092] S330: Adjust the operating state of the engine and at least one of the two motors in real time according to the current operating mode of the vehicle.

[0093] S340: When the current operating mode of the vehicle is the hybrid mode, the requested total tractive force of the vehicle is calculated based on the accelerator pedal opening information, the vehicle speed information, and the load weight information, and converted into the requested torque of the vehicle.

[0094] Hybrid mode uses the engine as the primary power source, working in conjunction with one of the electric motors to provide propulsion. In hybrid mode, the system calculates the required traction based on a multi-parameter model by collecting information about the accelerator pedal position, vehicle speed, and load weight. This information is then converted into requested torque using a dynamics model.

[0095] S350: Distribute and control the output torque of the engine and one of the motors according to the requested torque of the vehicle and output them to the outside.

[0096] Among them, after calculating the total traction required by the vehicle according to the traction calculation formula, the output torque of the engine and one of the motors is distributed and controlled and output to the outside.

[0097] In hybrid mode, the complementary advantages of the engine and motor achieve a balance between power performance and energy efficiency, which is particularly suitable for complex working conditions such as heavy load, high speed or rapid acceleration.

[0098] Furthermore, in this embodiment of the present invention, the hybrid mode may include a rapid acceleration condition and a steady driving condition; the two motors may include a first motor and a second motor. Based on this, before the aforementioned S350, which distributes and controls the output torque of the engine and one of the motors based on the vehicle's requested torque and outputs the torque, the following steps may be added:

[0099] Calculate the accelerator pedal's pressing speed based on the accelerator pedal opening information.

[0100] When the pedal speed of the accelerator pedal is greater than a preset pedal speed threshold, it is determined that the vehicle is in a rapid acceleration condition.

[0101] When the pedal speed of the accelerator pedal is less than or equal to a preset pedal speed threshold, it is determined that the vehicle is in a stable driving condition.

[0102] In hybrid mode, the system calculates the accelerator pedal speed based on accelerator pedal opening information, intelligently switching between rapid acceleration and smooth driving, and coordinating the torque output of the engine and electric motor to achieve a dynamic balance between power performance and energy efficiency. When the accelerator pedal speed exceeds a preset threshold, such as when the driver deeply depresses the accelerator to meet high power demands such as overtaking or climbing a hill, the vehicle is determined to be in rapid acceleration. When the accelerator pedal speed is less than or equal to the preset threshold, the vehicle is determined to be in smooth driving. Rapid acceleration and smooth driving can be applied to different driving scenarios, achieving an optimal balance between power performance and energy efficiency.

[0103] Based on this, S350 distributes and controls the output torque of the engine and one of the motors according to the vehicle's requested torque and outputs them externally. This can be specifically broken down into the following steps:

[0104] When the vehicle is in a rapid acceleration condition, the engine is controlled to output according to the maximum torque of the engine, and the first motor or the second motor is controlled to output according to the maximum torque of the motor.

[0105] Among them, by triggering the engine and motor to output maximum power, the advantage of the motor's fast instantaneous torque response can be used to compensate for the engine power lag and quickly respond to sudden acceleration.

[0106] When the vehicle is in a stable driving condition, the engine is controlled to output according to the third torque, and the first motor is controlled to output according to the fourth torque; the third torque is the optimal torque of the engine within the economic fuel zone at the current vehicle speed, and the fourth torque is the difference between the vehicle requested torque and the third torque.

[0107] Among them, when the car is driving steadily, the torque value output by the engine is made to fall within the operating range with the highest fuel efficiency according to the vehicle's real-time speed. This optimal torque value is combined with the first motor to supplement power, which can not only meet the current driving power demand, but also enable the engine to run at the lowest fuel consumption, which can minimize fuel consumption and achieve the purpose of environmental protection and energy saving.

[0108] As in the above embodiment, the vehicle's operating mode may specifically include a parking power generation mode. In response to this operating mode, the present invention further provides a control method for a dual-motor electric drive axle vehicle in a parking power generation mode. Figure 4 This is another flow chart of a control method for a dual-motor electric drive axle vehicle parking power generation mode provided by an embodiment of the present invention. Figure 4 This embodiment is an optimization based on the above embodiment. Specifically, according to the current working mode of the vehicle, the working state of the engine and at least one of the two motors is adjusted in real time. The specific details can be as follows:

[0109] When the current working mode of the vehicle is the parking power generation mode, the engine is controlled to drive at least one of the two motors to generate electricity and charge the battery until the power of the battery reaches a second preset battery power threshold.

[0110] like Figure 4 As shown, the method may include the following steps:

[0111] S410: Collect accelerator pedal opening information, vehicle speed information, acceleration information, battery power information, and load weight information in real time.

[0112] S420: Determine the current operating mode of the vehicle based on the accelerator pedal opening information, vehicle speed information, acceleration information, battery charge information, and load weight information, as well as a pre-established multi-parameter complex operating condition determination model.

[0113] S430: Adjust the operating state of the engine and at least one of the two motors in real time according to the current operating mode of the vehicle.

[0114] S440: When the current working mode of the vehicle is the parking power generation mode, control the engine to drive at least one of the two motors to generate electricity and charge the battery until the battery power reaches a second preset battery power threshold.

[0115] Parking Power Generation Mode operates when the vehicle is stationary, controlling the engine to drive at least one of the two motors to generate electricity and charge the battery. Parking Power Generation Mode automatically terminates when the battery charge reaches a second preset battery charge threshold. By controlling the charge within a reasonable range, it avoids energy waste and engine idling losses caused by inefficient charging at high charge levels. Parking Power Generation Mode actively generates electricity while the vehicle is stationary, addressing parking needs and reserving energy for subsequent driving.

[0116] As in the above embodiment, the vehicle's operating mode may specifically include an energy recovery mode. In view of this operating mode, the present invention further provides a method for controlling the energy recovery mode of a dual-motor electric drive axle vehicle. Figure 5 This is another flow chart of a method for controlling energy recovery mode of a dual-motor electric drive axle vehicle provided by an embodiment of the present invention. Figure 5 This embodiment is an optimization based on the above embodiment. Specifically, according to the current working mode of the vehicle, the working state of the engine and at least one of the two motors is adjusted in real time. The specific details can be as follows:

[0117] When the vehicle's current operating mode is energy recovery mode and the battery charge is within a preset charge range, at least one of the two motors is controlled to generate electricity according to the target power generation power by converting wheel kinetic energy and charge the battery; wherein the target power generation power is negatively correlated with the battery charge within the preset charge range of the battery.

[0118] like Figure 5 As shown, the method may include the following steps:

[0119] S510: Collect accelerator pedal opening information, vehicle speed information, acceleration information, battery power information, and load weight information in real time.

[0120] S520: Determine the current working mode of the vehicle based on the accelerator pedal opening information, vehicle speed information, acceleration information, battery power information, and load weight information, as well as a pre-established multi-parameter complex working condition determination model.

[0121] S530: Adjust the operating state of the engine and at least one of the two motors in real time according to the current operating mode of the vehicle.

[0122] S540. When the current operating mode of the vehicle is the energy recovery mode and the battery charge is within a preset charge range, control at least one of the two motors to generate electricity according to the target power generation power by converting wheel kinetic energy and charge the battery; wherein the target power generation power is negatively correlated with the battery charge within the preset charge range of the battery.

[0123] Energy recovery mode refers to an operating mode in which the vehicle, while coasting or braking, converts wheel kinetic energy into electrical energy through at least one of the motors and stores it in the battery. In energy recovery mode, the target power generation is negatively correlated with the battery charge level. When the battery charge is low, the battery is charged at a higher power generation rate to quickly replenish energy. When the battery charge is high, the efficiency of ion migration within the battery decreases, and the battery is charged at a lower power generation rate to prevent safety hazards such as battery overheating and preserve battery life. This design balances charging efficiency and battery protection, ensuring safe and stable vehicle operation.

[0124] Optionally, the target power generation power range is 0-100%, and the target power generation power is inversely proportional to the battery power within a preset battery power range.

[0125] For example, the target power generation is inversely proportional to the battery charge within a preset range: when the battery charge is 20%, the power generation is 100%; when the battery charge is 80%, the power generation is 0. This inverse proportional design causes the power generation to decrease linearly as the battery charge increases, ensuring that energy recovery always occurs within the high-efficiency range. By dynamically adjusting the power generation, energy recovery efficiency is maximized, extending battery life and improving range.

[0126] Based on the same inventive concept, an embodiment of the present invention also provides a dual-motor electric drive axle vehicle control system, which includes the dual-motor electric drive axle vehicle control method provided by any embodiment of the present invention. Therefore, the dual-motor electric drive axle vehicle control system provided by the embodiment of the present invention has the corresponding beneficial effects of the dual-motor electric drive axle vehicle control method provided by the embodiment of the present invention, which will not be repeated here.

[0127] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A dual-motor electric drive axle vehicle control method, characterized in that: include: Real-time collection of accelerator pedal opening information, vehicle speed information, acceleration information, battery power information and load weight information; determining a current operating mode of the vehicle based on the accelerator pedal opening information, the vehicle speed information, the acceleration information, the battery power information, and the load weight information, as well as a pre-established multi-parameter complex operating condition determination model; According to the current working mode of the vehicle, the working state of the engine and at least one of the two motors is adjusted in real time.

2. The control method according to claim 1, characterized in that: The operating mode of the vehicle includes a pure electric mode; According to the current operating mode of the vehicle, adjusting the operating state of the engine and at least one of the two motors in real time includes: When the current operating mode of the vehicle is the pure electric mode, calculating a requested total tractive force of the vehicle according to the accelerator pedal opening information, the vehicle speed information, and the load weight information, and converting the calculated total tractive force into a requested torque of the vehicle; According to the requested torque of the vehicle, the output torque of the two motors is distributed and controlled and outputted to the outside.

3. The control method according to claim 2, characterized in that: The pure electric mode includes a single motor mode and a dual motor mode; the two motors include a first motor and a second motor; Before distributing and controlling the output torques of the two motors according to the requested torque of the vehicle and outputting the torques to the outside, the method further includes: When the load weight information is less than a preset load weight threshold, the vehicle speed information is less than a preset vehicle speed threshold, and the battery power information is less than a first preset battery power threshold, determining that the vehicle is in a single-motor operating state; When the load weight information is greater than or equal to a preset load weight threshold, or the vehicle speed information is greater than or equal to a preset vehicle speed threshold, or the battery power information is greater than or equal to a first preset battery power threshold, determining that the vehicle is in a dual-motor operating state; Distributing and controlling the output torque of the two motors according to the requested torque of the vehicle and outputting the torque to the outside includes: When the vehicle is in a single-motor operating state, controlling the first motor or the second motor to output torque according to a request of the vehicle; When the vehicle is in a dual-motor operating state, the first motor is controlled to output a first torque, and the second motor is controlled to output a second torque; wherein the first torque is the optimal torque of the first motor at the current vehicle speed, and the second torque is the difference between the requested torque of the vehicle and the first torque.

4. The control method according to claim 1, wherein: The operating mode of the vehicle includes a hybrid mode; According to the current operating mode of the vehicle, adjusting the operating state of the engine and at least one of the two motors in real time includes: When the current operating mode of the vehicle is the hybrid mode, calculating a requested total tractive force of the vehicle according to the accelerator pedal opening information, the vehicle speed information, and the load weight information, and converting the calculated total tractive force into a requested torque of the vehicle; According to the requested torque of the vehicle, the output torque of the engine and one of the motors is distributed and controlled and outputted to the outside.

5. The control method according to claim 4, characterized in that: The hybrid mode includes a rapid acceleration condition and a stable driving condition; the two motors include a first motor and a second motor; Before distributing and controlling the output torque of the engine and one of the motors according to the requested torque of the vehicle and outputting the torque to the outside, the method further includes: Calculating the accelerator pedal's pedaling speed based on the accelerator pedal opening information; When the pedal speed of the accelerator pedal is greater than a preset pedal speed threshold, determining that the vehicle is in a rapid acceleration condition; When the pedal speed of the accelerator pedal is less than or equal to a preset pedal speed threshold, determining that the vehicle is in a stable driving condition; The method distributes and controls the output torque of the engine and one of the motors according to the requested torque of the vehicle and outputs the torque to the outside, including: When the vehicle is in a rapid acceleration condition, controlling the engine to output at the maximum engine torque, and controlling the first motor or the second motor to output at the maximum motor torque; When the vehicle is in a stable driving condition, the engine is controlled to output a third torque, and the first motor is controlled to output a fourth torque; wherein the third torque is the optimal torque of the engine within the economic fuel zone at the current vehicle speed, and the fourth torque is the difference between the vehicle requested torque and the third torque.

6. The control method according to claim 2 or 4, characterized in that: Calculating the requested total tractive force of the vehicle according to the accelerator pedal opening information, the vehicle speed information, and the load weight information, and converting the calculated total tractive force into the requested torque of the vehicle, including: The requested total traction force of the vehicle is calculated and converted into the requested torque of the vehicle according to the formula F=k1*P+k2*(1 / V)+k3*m; wherein P is the accelerator pedal opening information, V is the vehicle speed information, m is the load weight information, and k1, k2, and k3 are all set parameters.

7. The control method according to claim 1, characterized in that: The operating mode of the vehicle includes a parking power generation mode; According to the current operating mode of the vehicle, adjusting the operating state of the engine and at least one of the two motors in real time includes: When the current working mode of the vehicle is the parking power generation mode, the engine is controlled to drive at least one of the two motors to generate electricity and charge the battery until the power of the battery reaches a second preset battery power threshold.

8. The control method according to claim 1, characterized in that: The operating mode of the vehicle includes an energy recovery mode; According to the current operating mode of the vehicle, adjusting the operating state of the engine and at least one of the two motors in real time includes: When the current working mode of the vehicle is the energy recovery mode, When the battery charge is within a preset charge range, at least one of the two motors is controlled to generate electricity according to a target power generation power by converting wheel kinetic energy, and charge the battery; wherein the target power generation power is negatively correlated with the battery charge within the preset charge range.

9. The control method according to claim 8, characterized in that: The target power generation range is 0-100%, and the target power generation is inversely proportional to the battery power within the preset power range of the battery.

10. A dual-motor electric drive axle vehicle control system, characterized in that: Execute the dual-motor electric drive axle vehicle control method as described in any one of claims 1-9.

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