Vehicle power device, control method for vehicle power device, and vehicle

Abstract

The present application discloses a vehicle power device, a control method for a vehicle power device, and a vehicle. The vehicle power device comprises: a vehicle controller unit and a plurality of power systems. Each power system comprises: a battery, configured to provide electricity; a motor, configured to use the electricity of the battery to provide power; and a microcontroller unit, separately connected to the battery, the motor and the vehicle controller unit and configured to provide the electricity of the battery to the motor and transmit the rotating speed, torque and power of the motor to the vehicle controller unit. The motors of the power systems are connected in series, and the vehicle controller unit is configured to control the operating quantity of the motors on the basis of the rotating speed, torque and power of the motors, and send a control instruction to the microcontroller unit, so that the microcontroller unit controls the operating of the motors on the basis of the control instruction.

Description

Vehicle power device, vehicle power device control method and vehicle

[0001] This application claims priority to Chinese patent application No. 202311090809.3, filed on August 29, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of vehicle technology, and in particular to a vehicle power device, a control method for a vehicle power device, and a vehicle. Background Art

[0003] In recent years, with the increasing demand for environmental protection, the shortage of traditional energy and the rising prices of traditional energy, the demand for new energy power devices is increasing.

[0004] In the related art, although the vehicle power unit can provide power through multiple motors and a battery is configured for each motor, in order to improve the state consistency of multiple batteries, multiple motors are operated simultaneously, resulting in the inability to flexibly control the number of motors in operation. The simultaneous operation of multiple motors will also lead to reduced efficiency.

[0005] Therefore, there is an urgent need to design a vehicle power device, a control method for a vehicle power device, and a vehicle to flexibly control the number of motor operations and improve efficiency. Technical issues

[0006] This application aims to solve at least one of the technical problems existing in the prior art or related art. Technical Solutions

[0007] To this end, the present application provides a vehicle power device that can flexibly control the number of motors in operation and improve efficiency. The present application also provides a control method for the vehicle power device and a vehicle.

[0008] According to the first aspect of the present application, a vehicle power device includes a vehicle control unit and multiple power systems, each power system includes: a battery for providing electricity; a motor for using the power of the battery to provide power; a micro control unit connected to the battery, the motor and the vehicle control unit respectively, for providing the power of the battery to the motor, and transmitting the speed, torque and power of the motor to the vehicle control unit; the motors of each power system are connected in series, and the vehicle control unit is used to control the number of running motors according to the speed, torque and power of the motors, and send control instructions to the micro control unit so that the micro control unit controls the operation of the motors according to the control instructions.

[0009] In one embodiment, the vehicle control unit is further configured to: in a driving mode, determine whether the speed of the motor is less than or equal to the rated speed; when the speed of the motor is less than or equal to the rated speed, determine the range of the motor torque; when the motor torque is less than or equal to 1 / N of the rated torque, operate one motor; when the motor torque is greater than (X-1) / N of the rated torque and less than or equal to X / N of the rated torque, operate X motors; and when the motor torque is greater than (N-1) / N of the rated torque, operate N motors; when the speed of the motor is greater than the rated speed, determine the range of the motor power; when the motor power is less than or equal to 1 / N of the rated power, operate one motor; when the motor power is greater than (X-1) / N of the rated power and less than or equal to X / N of the rated power, operate X motors; and when the motor power is greater than (N-1) / N of the rated power, operate N motors; N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

[0010] In one embodiment, the vehicle control unit is further configured to: in a braking mode, determine whether the speed of the motor is less than or equal to the peak torque inflection speed; when the speed of the motor is less than or equal to the peak torque inflection speed, determine the range of the motor torque; when the motor torque is less than 1 / N of the peak torque, operate one motor; when the motor torque is greater than or equal to (X-1) / N of the peak torque and less than X / N of the peak torque, operate X motors; and when the motor torque is greater than or equal to (N-1) / N of the peak torque, operate N motors; when the speed of the motor is greater than the peak torque inflection speed, determine the range of the motor power; when the motor power is less than 1 / N of the peak power, operate one motor; when the motor power is greater than or equal to (X-1) / N of the peak power and less than X / N of the peak power, operate X motors; and when the motor power is greater than or equal to (N-1) / N of the peak power, operate N motors; N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

[0011] In one embodiment, each power system further includes: a battery management system, connected to the vehicle control unit and the battery respectively, for transmitting the battery's state of charge value to the vehicle control unit, and the vehicle control unit is further used to: control the operation of the motor according to the battery's state of charge value.

[0012] In one embodiment, the vehicle power device includes three power systems, and the vehicle control unit is further configured to: in the driving mode, when the number of motors in operation is one, select the motor corresponding to the battery with the largest state of charge value for driving, and when the difference between the maximum state of charge value and the intermediate state of charge value is greater than or equal to a first threshold, reselect the motor corresponding to the battery with the largest state of charge value for driving; when the number of motors in operation is two, select the motors corresponding to two batteries with relatively large state of charge values ​​for driving, and when the difference between the intermediate state of charge value and the minimum state of charge value is greater than or equal to the first threshold, reselect the motor corresponding to the battery with relatively large state of charge value. The motors corresponding to the two batteries are used for driving; in braking mode, when the number of motors in operation is one, the motor corresponding to the battery with the smallest charge state value is selected for braking, and when the difference between the intermediate charge state value and the minimum charge state value is greater than or equal to a first threshold value, the motor corresponding to the battery with the smallest charge state value is reselected for braking; when the number of motors in operation is two, the motors corresponding to the two batteries with relatively small charge state values ​​are selected for braking, and when the difference between the maximum charge state value and the intermediate charge state value is greater than or equal to the first threshold value, the motors corresponding to the two batteries with relatively small charge state values ​​are reselected for braking.

[0013] In one embodiment, the vehicle power unit includes three power systems, and the vehicle control unit is further used to: judge the range of the battery's charge state value, so that the motor corresponding to the battery with a charge state value less than a second threshold is not operated in the forward drive mode, and the motor corresponding to the battery with a charge state value greater than or equal to a third threshold is not operated in the braking mode.

[0014] In one embodiment, the vehicle power unit includes three power systems, and the micro control unit is also used to transmit the motor temperature of the motor to the vehicle control unit. The vehicle control unit is also used to: enable the motor to operate normally when the motor temperature is in the first temperature range, enable the motor to operate at reduced power when the motor temperature is in the second temperature range, and enable the motor to not operate when the motor temperature is in the third temperature range.

[0015] A vehicle according to a second aspect of the present application includes the vehicle power device of the first aspect or its various implementations.

[0016] According to a third aspect of the present application, a method for controlling a vehicle power unit is provided. The vehicle power unit includes a vehicle control unit and multiple power systems. Each power system includes a battery, a micro control unit and a motor connected in sequence. The micro control unit is also connected to the vehicle control unit. The motors of each power system are connected in series. The method for controlling the vehicle power unit includes: the micro control unit transmits the speed, torque and power of the motor to the vehicle control unit; the vehicle control unit controls the number of running motors according to the speed, torque and power of the motor; the vehicle control unit sends control instructions to the micro control unit; and the micro control unit controls the operation of the motor according to the control instructions.

[0017] In one embodiment, a vehicle control unit controls the number of motors in operation based on the speed, torque, and power of the motors, including: in a driving mode, determining whether the speed of the motor is less than or equal to the rated speed; when the speed of the motor is less than or equal to the rated speed, determining the range of the motor torque; when the motor torque is less than or equal to 1 / N of the rated torque, operating one motor; when the motor torque is greater than (X-1) / N of the rated torque and less than or equal to X / N of the rated torque, operating X motors; and when the motor torque is greater than (N-1) / N of the rated torque, operating N motors; when the speed of the motor is greater than the rated speed, determining the range of the motor power; when the motor power is less than or equal to 1 / N of the rated power, operating one motor; when the motor power is greater than (X-1) / N of the rated power and less than or equal to X / N of the rated power, operating X motors; and when the motor power is greater than (N-1) / N of the rated power, operating N motors; N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

[0018] In one embodiment, the vehicle control unit controls the number of motors in operation according to the speed, torque, and power of the motors, including: in braking mode, the vehicle control unit determines whether the speed of the motor is less than or equal to the peak torque inflection point speed; when the speed of the motor is less than or equal to the peak torque inflection point speed, the torque range of the motor is determined, when the torque of the motor is less than 1 / N of the peak torque, one motor is operated; when the torque of the motor is greater than or equal to (X-1) / N of the peak torque and less than X / N of the peak torque, X motors are operated; when the torque of the motor is greater than or equal to (X-1) / N of the peak torque and less than X / N of the peak torque, X motors are operated; When the speed of the motor is greater than (N-1) / N of the peak torque, N motors are operated; when the speed of the motor is greater than the speed at the peak torque inflection point, the vehicle control unit determines the power range of the motor. When the power of the motor is less than 1 / N of the peak power, one motor is operated. When the power of the motor is greater than or equal to (X-1) / N of the peak power and less than X / N of the peak power, X motors are operated. When the power of the motor is greater than or equal to (N-1) / N of the peak power, N motors are operated. N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

[0019] In one embodiment, each power system also includes: a battery management system, which is connected to the vehicle control unit and the battery respectively; the control method of the vehicle power device also includes: the battery management system transmits the charge state value of the battery to the vehicle control unit; the vehicle control unit controls the operation of the motor according to the charge state value of the battery.

[0020] In one embodiment, the vehicle power device includes three power systems, and the vehicle control unit controls the operation of the motor according to the charge state value of the battery, including: in the driving mode, when the number of running motors is one, the motor corresponding to the battery with the largest charge state value is selected for driving, and when the difference between the maximum charge state value and the intermediate charge state value is greater than or equal to a first threshold, the motor corresponding to the battery with the largest charge state value is reselected for driving; when the number of running motors is two, the motors corresponding to two batteries with relatively large charge state values ​​are selected for driving, and when the difference between the intermediate charge state value and the minimum charge state value is greater than or equal to the first threshold, the motor corresponding to the battery with the largest charge state value is reselected. The motors corresponding to the two batteries with relatively large charge state values ​​are used for driving; in braking mode, when the number of motors in operation is one, the motor corresponding to the battery with the smallest charge state value is selected for braking, and when the difference between the intermediate charge state value and the minimum charge state value is greater than or equal to a first threshold value, the motor corresponding to the battery with the smallest charge state value is reselected for braking; when the number of motors in operation is two, the motors corresponding to the two batteries with relatively small charge state values ​​are selected for braking, and when the difference between the maximum charge state value and the intermediate charge state value is greater than or equal to the first threshold value, the motors corresponding to the two batteries with relatively small charge state values ​​are reselected for braking.

[0021] In one embodiment, the vehicle power unit includes three power systems, and the vehicle control unit controls the operation of the motor according to the charge state value of the battery, including: judging the range of the charge state value of the battery, so that the motor corresponding to the battery with a charge state value less than a second threshold is not operated in the forward drive mode, and the motor corresponding to the battery with a charge state value greater than or equal to a third threshold is not operated in the braking mode.

[0022] In one embodiment, the vehicle power unit includes three power systems, and the control method of the vehicle power unit also includes: the micro control unit transmits the motor temperature of the motor to the vehicle control unit; the vehicle control unit causes the motor to operate normally when the motor temperature is in the first temperature range, causes the motor to operate at reduced power when the motor temperature is in the second temperature range, and causes the motor to not operate when the motor temperature is in the third temperature range. Beneficial effects

[0023] For a vehicle power device of the present application, the series-connected motors can be used for direct drive to form a direct-drive power device. The use of a direct-drive power device can reduce the probability of drive interruption; the number of running motors can be controlled according to the motor's speed, torque and power. Since the number of running motors is controllable, the problem of not being able to flexibly control the number of running motors can be solved; by running fewer motors, efficiency can be improved to a certain extent, motor and battery losses can be reduced, and service life can be increased.

[0024] The vehicle provided in this application includes the vehicle power device described above. Since the vehicle power device described above has the above-mentioned technical effects, the vehicle including the vehicle power device should also have corresponding technical effects.

[0025] The control method of the vehicle power unit provided in this application can be implemented based on the vehicle power unit described above. Since the vehicle power unit described above has the above-mentioned technical effects, the control method implemented based on the vehicle power unit should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 shows a schematic structural diagram of a vehicle power device according to an embodiment of the present application;

[0027] FIG2 shows a control flow chart of a driving mode according to an embodiment of the present application;

[0028] FIG3 shows a control flow chart of a braking mode according to an embodiment of the present application;

[0029] FIG4 shows a control flow chart for charge state equalization in a driving mode according to an embodiment of the present application;

[0030] FIG5 shows a control flow chart for charge state equalization in a braking mode according to an embodiment of the present application;

[0031] FIG6 shows a flowchart of an implementation of a policy selection according to an embodiment of the present application;

[0032] FIG7 shows a flow chart of a method for controlling a vehicle power device according to an embodiment of the present application. Modes for Carrying Out the Invention

[0033] During their research, the inventors discovered that in related technologies, the motors in vehicle power units convert electricity into power. Each of the multiple motors is connected to a battery. To improve battery state consistency, multiple motors must operate simultaneously, which reduces efficiency. Large vehicles and other equipment require relatively high-power and reliable power units. Vehicles such as mining trucks use manual shifting or AMTs (Automated Mechanical Transmissions) and non-direct drive power units, which can result in power interruptions and pose a safety hazard when shifting on hills while loaded. When a power unit with a voltage of up to 900 volts is equipped with a single motor, the relatively high current generated requires control components with stronger current capacity and higher costs, making implementation difficult and costly. Failure of a single motor can cause the power unit to cease operation.

[0034] To address at least one of the technical problems in the prior art or related art, the present application provides a vehicle power unit, a control method for a vehicle power unit, and a vehicle. A vehicle power unit, a control method for a vehicle power unit, and a vehicle according to some embodiments of the present application are described below with reference to Figures 1 to 7 .

[0035] Referring to Figures 1 to 6, a vehicle power device of an embodiment provided in the present application includes a vehicle control unit and multiple power systems, each power system includes: a battery for providing electricity; a motor for using the power of the battery to provide power; a micro control unit connected to the battery, the motor and the vehicle control unit respectively, for providing the power of the battery to the motor, and transmitting the speed, torque and power of the motor to the vehicle control unit; the motors of each power system are connected in series, and the vehicle control unit is used to control the number of running motors according to the speed, torque and power of the motors, and send control instructions to the micro control unit so that the micro control unit controls the operation of the motors according to the control instructions.

[0036] It should be noted that FIG1 shows an embodiment including three power systems and is not intended to limit the scope of protection of this application. The vehicle power unit of the exemplary embodiment may include more power systems. The first motor, the second motor, and the third motor are connected in series and directly connected to the axle or bridge, etc. to realize a direct-drive power unit. For example, as shown in FIG1 , the first motor, the second motor, and the third motor connected in series can be connected to the reducer 200, and the reducer 200 can be connected to the wheel 100. Exemplarily, the first power system includes: a first motor, a first MCU (Microcontroller Unit), a first battery, and a first BMS (Battery Management System), wherein the first motor, the first MCU, the first battery, and the first BMS are connected in sequence. The second power system and the third power system also have similar structures and will not be described in detail here.

[0037] In an exemplary embodiment, the first, second, and third BMSs, the first, second, and third MCUs, the Vehicle Controller Unit (VCU), the shift lever, the accelerator, the retarder, the foot brake, and the parking brake are connected via a CAN (Controller Area Network). The VCU sends control commands to the corresponding MCU to control the corresponding motors. The BMS monitors the battery status; the MCU monitors the motor status and provides power to the motors. The three power systems can be considered connected in parallel. The total output voltage of the three power systems can be 600V. The multiple batteries enable simultaneous charging using multiple charging guns to save charging time. The multiple motors are connected in series and directly driven, reducing or even eliminating power interruptions, thereby improving system reliability and stability and mitigating safety hazards. The ability to control the number of motors in operation allows for a combination of different motors, enabling flexible motor selection. Fewer motors can be used as needed, improving efficiency. Furthermore, motors that are stable and efficient can be operated, further improving stability and efficiency and reducing energy consumption. Compared to running three motors simultaneously, operating a single motor can improve efficiency by 20% or more. Because multiple motors and their corresponding batteries share the voltage and current of the vehicle's powertrain, control complexity is reduced and relatively low-cost components can be utilized, making it easier to implement and less expensive. When multiple motors are connected in series, if one motor shuts down due to a fault, a non-faulty motor can be selected for operation, reducing the downtime rate.

[0038] Furthermore, the vehicle control unit is further configured to: in a driving mode, determine whether the speed of the motor is less than or equal to the rated speed; when the speed of the motor is less than or equal to the rated speed, determine the range of the motor torque; when the torque of the motor is less than or equal to 1 / N of the rated torque, operate one motor; when the torque of the motor is greater than (X-1) / N of the rated torque and less than or equal to X / N of the rated torque, operate X motors; and when the torque of the motor is greater than (N-1) / N of the rated torque, operate N motors; when the speed of the motor is greater than the rated speed, determine the range of the motor power; when the power of the motor is less than or equal to 1 / N of the rated power, operate one motor; when the power of the motor is greater than (X-1) / N of the rated power and less than or equal to X / N of the rated power, operate X motors; and when the power of the motor is greater than (N-1) / N of the rated power, operate N motors; N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

[0039] For example, in the driving mode, it is determined whether the motor speed is less than or equal to the rated speed; when the motor speed is less than or equal to the rated speed, the motor torque range is determined. When the motor torque is less than or equal to 1 / N of the rated torque, one motor is operated. When the motor torque is greater than 1 / N of the rated torque and less than or equal to 2 / N of the rated torque, two motors are operated. Similarly, when the motor torque is greater than (N-1) / N of the rated torque, N motors are operated. When the motor speed is greater than the rated speed, the motor power range is determined. When the motor power is less than or equal to 1 / N of the rated power, one motor is operated. When the motor power is greater than 1 / N of the rated power and less than or equal to 2 / N of the rated power, two motors are operated. Similarly, when the motor power is greater than (N-1) / N of the rated power, N motors are operated. N is a natural number, N is greater than or equal to 3, and N is the total number of motors.

[0040] For example, if the current vehicle power unit contains three motors, the value of N is 3. First, the current speed of the motor is judged. If the current speed is less than or equal to the rated speed of the motor, the torque of the motor is judged against the rated torque, and the rated torque is divided into three equal segments to form three subsets. The torque of the motor belongs to one of the three subsets, corresponding to the operation of a single motor, dual motors, or three motors in the vehicle power unit; if the current speed is greater than the rated speed of the motor, the power of the motor is judged against the rated power, and the rated power is divided into three equal segments to form three subsets. The power of the motor belongs to one of the three subsets, corresponding to the operation of a single motor, dual motors, or three motors in the vehicle power unit.

[0041] In an exemplary embodiment, by selecting the number of motors that matches a specific power rating or torque rating, the number of operating motors can be appropriately distributed within a feasible range. If motor efficiency shows signs of decreasing, the number of operating motors can be promptly increased or decreased. For example, specific torque ratings and specific power ratings can indicate significant changes in motor efficiency. The number of operating motors can be adjusted before significant changes occur, thereby maximizing efficiency and operational stability.

[0042] Furthermore, the vehicle control unit is further configured to: in a braking mode, determine whether the speed of the motor is less than or equal to the peak torque inflection point speed; when the speed of the motor is less than or equal to the peak torque inflection point speed, determine the range of the motor torque; when the torque of the motor is less than 1 / N of the peak torque, operate one motor; when the torque of the motor is greater than or equal to (X-1) / N of the peak torque and less than X / N of the peak torque, operate X motors; and when the torque of the motor is greater than or equal to (N-1) / N of the peak torque, operate N motors; when the speed of the motor is greater than the peak torque inflection point speed, determine the range of the motor power; when the power of the motor is less than 1 / N of the peak power, operate one motor; when the power of the motor is greater than or equal to (X-1) / N of the peak power and less than X / N of the peak power, operate X motors; and when the power of the motor is greater than or equal to (N-1) / N of the peak power, operate N motors; N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

[0043] For example, in the braking mode, it is determined whether the motor speed is less than or equal to the peak torque inflection point speed; wherein the peak torque inflection point speed is the inflection point speed of the motor external characteristic curve. When the motor speed is less than or equal to the peak torque inflection point speed, the motor torque range is judged. When the motor torque is less than 1 / N of the peak torque, one motor is operated. When the motor torque is greater than or equal to 1 / N of the peak torque and less than 2 / N of the peak torque, two motors are operated. Similarly, when the motor torque is greater than or equal to (N-1) / N of the peak torque, N motors are operated. When the motor speed is greater than the peak torque inflection point speed, the motor power range is judged. When the motor power is less than 1 / N of the peak power, one motor is operated. When the motor power is greater than or equal to 1 / N of the peak power and less than 2 / N of the peak power, two motors are operated. Similarly, when the motor power is greater than or equal to (N-1) / N of the peak power, N motors are operated. N is a natural number, N is greater than or equal to 3, and N is the total number of motors.

[0044] In an exemplary embodiment, the peak torque inflection point speed can be understood as follows: a constant torque state refers to a motor with a constant output torque over a period of time; a constant power state refers to a motor with a constant output power over a period of time. The speed at which the motor transitions from the constant torque state to the constant power state is the peak torque inflection point speed. Specifically, after starting the motor, the motor speed gradually increases, the motor output power gradually increases, and the motor output torque remains constant, indicating that the motor is in a constant torque state. The speed increases until the motor output power reaches its maximum value (i.e., peak power), which is considered the inflection point speed. Subsequently, as the speed continues to increase, the motor output torque begins to decrease, while the motor output power remains at peak power, indicating that the motor is in a constant power state. In braking mode, the specific ratio peak torque and specific ratio peak power can reflect states where motor efficiency is experiencing significant changes. The number of motors in operation can be adjusted before significant changes occur, thereby maximizing efficiency and operational stability.

[0045] For example, if the current vehicle power unit contains three motors, the value of N is 3, and the current motor speed and the inflection point speed of the motor external characteristic curve are judged. If the current speed is less than or equal to the inflection point speed of the external characteristic curve, the braking demand torque and the assembly peak torque are judged, and the assembly peak torque is divided into three equal segments to form three subsets. The braking demand torque belongs to one of the three subsets, corresponding to the operation of a single motor, dual motors, and three motors in the power unit; if the current speed is greater than the inflection point speed of the external characteristic curve, the braking demand power and the assembly peak power are judged, and the assembly peak power is divided into three equal segments to form three subsets. The braking demand power belongs to one of the three subsets, corresponding to the operation of a single motor, dual motors, and three motors in the powertrain.

[0046] In the exemplary embodiment, Figures 2 and 3 correspond to the driving mode and the braking mode, respectively. Although these figures are illustrated using three motors as an example, the embodiment can be expanded to more motors and can achieve corresponding technical effects, which will not be repeated here.

[0047] Furthermore, each power system also includes: a battery management system, which is connected to the vehicle control unit and the battery respectively, and is used to transmit the battery's SOC (State of Charge) to the vehicle control unit. The vehicle control unit is also used to control the operation of the motor according to the battery's SOC value.

[0048] In an exemplary embodiment, the charge state value can reflect the percentage of the remaining battery power to the total power, that is, reflect the battery power consumption. According to the battery power consumption, the operating state of the motor is changed in time, thereby changing the operating state of the battery, so that the battery power can meet the needs and achieve the effect of flexible control of the battery power.

[0049] Furthermore, the vehicle power device includes three power systems, and the vehicle control unit is also used to: in the driving mode, when the number of running motors is 1, select the motor corresponding to the battery with the largest charge state value for driving, and when the difference between the maximum charge state value and the intermediate charge state value is greater than or equal to a first threshold value, reselect the motor corresponding to the battery with the largest charge state value for driving; when the number of running motors is 2, select the motors corresponding to the two batteries with relatively large charge state values ​​for driving, and when the difference between the intermediate charge state value and the minimum charge state value is greater than or equal to the first threshold value, reselect the two batteries with relatively large charge state values. The motors corresponding to the batteries are used for driving; in braking mode, when the number of running motors is 1, the motor corresponding to the battery with the smallest charge state value is selected for braking, and when the difference between the intermediate charge state value and the minimum charge state value is greater than or equal to a first threshold value, the motor corresponding to the battery with the smallest charge state value is reselected for braking; when the number of running motors is 2, the motors corresponding to the two batteries with relatively small charge state values ​​are selected for braking, and when the difference between the maximum charge state value and the intermediate charge state value is greater than or equal to the first threshold value, the motors corresponding to the two batteries with relatively small charge state values ​​are reselected for braking.

[0050] It should be noted that the charge state values ​​of the three batteries can be sorted, and in ascending order, they can be the minimum charge state value, the intermediate charge state value, and the maximum charge state value. In an exemplary embodiment, referring to Figures 4 and 5, in driving mode and braking mode, in order to achieve SOC balance, the charge state values ​​can be compared to select or switch the motor to be operated, thereby making the charge state values ​​of the multiple batteries relatively balanced and achieving the effect of reasonably distributing the battery power.

[0051] Exemplarily, the vehicle power unit includes three power systems, and the vehicle control unit is also used to: judge the range of the battery's charge state value, so that the motor corresponding to the battery with a charge state value less than the second threshold is not operated in the forward drive mode, and the motor corresponding to the battery with a charge state value greater than or equal to the third threshold is not operated in the braking mode.

[0052] Furthermore, the vehicle power unit includes three power systems, and the micro control unit is also used to transmit the motor temperature of the motor to the vehicle control unit. The vehicle control unit is also used to: enable the motor to operate normally when the motor temperature is in the first temperature range, enable the motor to operate at reduced power when the motor temperature is in the second temperature range, and enable the motor to not operate when the motor temperature is in the third temperature range.

[0053] In an exemplary embodiment, referring to FIG. 6 , a strategy selection can be used to determine whether to control the motor based on motor temperature or based on the battery's State of Charge (SOC). Motor derating operation may mean reducing the motor's operating power to improve motor operating stability in a low-power state. Forward drive mode may represent a mode in which the vehicle travels forward. The first temperature range may be less than 130°C, the second temperature range may be greater than or equal to 130°C and less than 150°C, and the third temperature range may be greater than or equal to 150°C. The first, second, and third temperature ranges may be consecutive temperature ranges. The state of charge value may be used to indicate the remaining charge. The second and third thresholds may be 20% and 85%, respectively, indicating that the remaining charge is 20% and 85% of the total charge, respectively. Temperature-based motor control may be performed first, followed by SOC-based motor control. This allows a motor with relatively high stability to be operated, thereby improving system stability.

[0054] In another embodiment, the vehicle power unit of the exemplary embodiment may be provided in a vehicle, which may be a mining vehicle, a wide-body mining vehicle, a mining truck, etc. The mining vehicle may include a coal mining vehicle.

[0055] In another embodiment, as shown in FIG7 , an exemplary embodiment provides a method for controlling a vehicle power unit. The vehicle power unit includes a vehicle control unit and multiple power systems. Each power system includes a battery, a micro control unit, and a motor connected in sequence. The micro control unit is also connected to the vehicle control unit. The motors of each power system are connected in series. Accordingly, the method for controlling the vehicle power unit includes:

[0056] S101, the micro control unit transmits the speed, torque and power of the motor to the vehicle control unit;

[0057] S102, the vehicle control unit controls the number of motor operations according to the motor's speed, torque, and power;

[0058] S103, the vehicle control unit sends a control instruction to the micro control unit;

[0059] S104, the micro control unit controls the operation of the motor according to the control instruction.

[0060] Furthermore, the vehicle control unit controls the number of motors in operation according to the speed, torque and power of the motors, including: in the driving mode, determining whether the speed of the motor is less than or equal to the rated speed; when the speed of the motor is less than or equal to the rated speed, determining the range of the motor torque; when the torque of the motor is less than or equal to 1 / N of the rated torque, operating one motor; when the torque of the motor is greater than (X-1) / N of the rated torque and less than or equal to X / N of the rated torque, operating X motors; when the torque of the motor is greater than (X-1) / N of the rated torque and less than or equal to X / N of the rated torque, operating X motors; When the speed of the motor is greater than the rated speed, the vehicle control unit determines the power range of the motor. When the power of the motor is less than or equal to 1 / N of the rated power, one motor is operated. When the power of the motor is greater than (X-1) / N of the rated power and less than or equal to X / N of the rated power, X motors are operated. When the power of the motor is greater than (N-1) / N of the rated power, N motors are operated. N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

[0061] Furthermore, the vehicle control unit controls the number of motors in operation according to the motor speed, torque and power, including: in braking mode, determining whether the motor speed is less than or equal to the peak torque inflection point speed; when the motor speed is less than or equal to the peak torque inflection point speed, determining the range of the motor torque, when the motor torque is less than 1 / N of the peak torque, running one motor, when the motor torque is greater than or equal to (X-1) / N of the peak torque and less than X / N of the peak torque, running X motors, when the motor torque is greater than or equal to (X-1) / N of the peak torque and less than X / N of the peak torque, running X motors, and when the motor torque is greater than or equal to When the peak torque is (N-1) / N, N motors are operated. When the motor speed is greater than the peak torque inflection point speed, the motor power range is determined. When the motor power is less than 1 / N of the peak power, one motor is operated. When the motor power is greater than or equal to (X-1) / N of the peak power and less than X / N of the peak power, X motors are operated. When the motor power is greater than or equal to (N-1) / N of the peak power, N motors are operated. N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

[0062] Furthermore, each power system also includes: a battery management system, which is connected to the vehicle control unit and the battery respectively; the control method of the vehicle power device also includes: the battery management system transmits the charge state value of the battery to the vehicle control unit; the vehicle control unit controls the operation of the motor according to the charge state value of the battery.

[0063] Furthermore, the vehicle power device includes three power systems, and the vehicle control unit controls the operation of the motor according to the charge state value of the battery, including: in the driving mode, when the number of running motors is 1, the motor corresponding to the battery with the largest charge state value is selected for driving, and when the difference between the maximum charge state value and the intermediate charge state value is greater than or equal to a first threshold value, the motor corresponding to the battery with the largest charge state value is reselected for driving; when the number of running motors is 2, the motors corresponding to the two batteries with relatively large charge state values ​​are selected for driving, and when the difference between the intermediate charge state value and the minimum charge state value is greater than or equal to the first threshold value, the motor corresponding to the battery with the largest charge state value is reselected. The motors corresponding to the two batteries with relatively large charge state values ​​are used for driving; in braking mode, when the number of motors in operation is 1, the motor corresponding to the battery with the smallest charge state value is selected for braking, and when the difference between the intermediate charge state value and the minimum charge state value is greater than or equal to a first threshold value, the motor corresponding to the battery with the smallest charge state value is reselected for braking; when the number of motors in operation is 2, the motors corresponding to the two batteries with relatively small charge state values ​​are selected for braking, and when the difference between the maximum charge state value and the intermediate charge state value is greater than or equal to the first threshold value, the motors corresponding to the two batteries with relatively small charge state values ​​are reselected for braking.

[0064] Furthermore, the vehicle power unit includes three power systems, and the vehicle control unit controls the operation of the motor according to the charge state value of the battery, including: judging the range of the charge state value of the battery, so that the motor corresponding to the battery with a charge state value less than the second threshold is not operated in the forward drive mode, and the motor corresponding to the battery with a charge state value greater than or equal to the third threshold is not operated in the braking mode.

[0065] Furthermore, the vehicle power unit includes three power systems, and the control method of the vehicle power unit also includes: the micro control unit transmits the motor temperature of the motor to the vehicle control unit; the vehicle control unit enables the motor to operate normally when the motor temperature is in the first temperature range, enables the motor to operate at reduced power when the motor temperature is in the second temperature range, and enables the motor not to operate when the motor temperature is in the third temperature range.

[0066] Since the vehicle provided by the exemplary embodiment includes the vehicle power device of any of the above exemplary embodiments, the vehicle has all the beneficial effects of the vehicle power device provided by any of the above embodiments, which will not be described in detail here.

[0067] Since the control method of the vehicle power unit provided by the exemplary embodiment is implemented based on the vehicle power unit of any of the above-mentioned exemplary embodiments, the control method has all the beneficial effects of the vehicle power unit provided by any of the above-mentioned embodiments. The implementation method of the control method can be implemented with reference to the vehicle power unit embodiment and will not be repeated here.

[0068] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0069] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0070] In this application, unless otherwise expressly specified or limited, when a first feature is “on” or “below” a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above”, or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below”, “below”, or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0071] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "exemplary embodiment", "example", "specific example" or "some examples" 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 expressions 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 different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0072] 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 vehicle power device, wherein: The device comprises: a vehicle control unit and a plurality of power systems, each power system comprising: Batteries, used to provide electricity; a motor for providing power using the power of the battery; A micro control unit, connected to the battery, the motor and the vehicle control unit, respectively, for supplying power from the battery to the motor and transmitting the speed, torque and power of the motor to the vehicle control unit; The motors of each of the power systems are connected in series, and the vehicle control unit is used to control the running number of the motors according to the speed, torque and power of the motors, and send control instructions to the microcontroller unit so that the microcontroller unit controls the operation of the motors according to the control instructions.

2. The vehicle power unit according to claim 1, wherein: The vehicle control unit is further used for: in the driving mode, judging whether the rotation speed of the motor is less than or equal to the rated rotation speed; when the rotation speed of the motor is less than or equal to the rated rotation speed, judging the interval of the torque of the motor, and when the torque of the motor is less than or equal to 1 / N of the rated torque, operating one motor, when the torque of the motor is greater than (X-1) / N of the rated torque and less than or equal to X / N of the rated torque, operating X motors, and when the torque of the motor is greater than (N-1) / N of the rated torque, operating N motors; When the speed of the motor is greater than the rated speed, the power range of the motor is judged. When the power of the motor is less than or equal to 1 / N of the rated power, one motor is operated. When the power of the motor is greater than (X-1) / N of the rated power and less than or equal to X / N of the rated power, X motors are operated. When the power of the motor is greater than (N-1) / N of the rated power, N motors are operated. N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

3. The vehicle power device according to claim 1 or 2, wherein: The vehicle control unit is further used to: in a braking mode, determine whether the rotation speed of the motor is less than or equal to the peak torque inflection point rotation speed; when the rotation speed of the motor is less than or equal to the peak torque inflection point rotation speed, determine the interval in which the torque of the motor is located, and when the torque of the motor is less than 1 / N of the peak torque, operate one motor; when the torque of the motor is greater than or equal to (X-1) / N of the peak torque and less than X / N of the peak torque, operate X motors; when the torque of the motor is greater than or equal to (N-1) / N of the peak torque, operate N motors; When the speed of the motor is greater than the peak torque inflection point speed, the power interval of the motor is judged. When the power of the motor is less than 1 / N of the peak power, one motor is operated. When the power of the motor is greater than or equal to (X-1) / N of the peak power and less than X / N of the peak power, X motors are operated. When the power of the motor is greater than or equal to (N-1) / N of the peak power, N motors are operated. N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

4. The vehicle power unit according to any one of claims 1 to 3, wherein: Each power system also includes: a battery management system, which is connected to the vehicle control unit and the battery respectively, and is used to transmit the charge state value of the battery to the vehicle control unit. The vehicle control unit is also used to control the operation of the motor according to the charge state value of the battery.

5. The vehicle power unit according to any one of claims 1 to 4, wherein: The vehicle power device includes three power systems, and the vehicle control unit is also used for: In the driving mode, when the number of the motors in operation is 1, the motor corresponding to the battery with the largest state of charge value is selected for driving, and when the difference between the maximum state of charge value and the intermediate state of charge value is greater than or equal to a first threshold, the motor corresponding to the battery with the largest state of charge value is reselected for driving; when the number of the motors in operation is 2, the motors corresponding to two batteries with relatively large state of charge values ​​are selected for driving, and when the difference between the intermediate state of charge value and the minimum state of charge value is greater than or equal to the first threshold, the motors corresponding to two batteries with relatively large state of charge values ​​are reselected for driving; In the braking mode, when the number of the motors in operation is one, the motor corresponding to the battery with the smallest state of charge value is selected for braking, and when the difference between the intermediate state of charge value and the minimum state of charge value is greater than or equal to a first threshold, the motor corresponding to the battery with the smallest state of charge value is reselected for braking; When the number of motors in operation is two, the motors corresponding to the two batteries with relatively small charge state values ​​are selected for braking, and when the difference between the maximum charge state value and the intermediate charge state value is greater than or equal to a first threshold, the motors corresponding to the two batteries with relatively small charge state values ​​are reselected for braking.

6. The vehicle power device according to any one of claims 1 to 5, wherein: The vehicle power unit includes three power systems, and the vehicle control unit is also used to: judge the interval of the battery's charge state value, so that the motor corresponding to the battery with a charge state value less than a second threshold is not operated in the forward drive mode, and the motor corresponding to the battery with a charge state value greater than or equal to a third threshold is not operated in the braking mode.

7. The vehicle power unit according to any one of claims 1 to 6, wherein: The vehicle power device includes three power systems, the micro control unit is further used to transmit the motor temperature of the motor to the vehicle control unit, and the vehicle control unit is further used to: The motor whose temperature is in the first temperature range is made to operate normally, the motor whose temperature is in the second temperature range is made to operate with reduced power, and the motor whose temperature is in the third temperature range is made not to operate.

8. A vehicle, wherein: The vehicle comprises a vehicle power unit as claimed in any one of claims 1 to 7.

9. A method for controlling a vehicle power device, wherein: The vehicle power device comprises a vehicle control unit and a plurality of power systems, each power system comprises a battery, a micro control unit and a motor connected in sequence, the micro control unit is also connected to the vehicle control unit, the motors of the respective power systems are connected in series, and the control method of the vehicle power device comprises: The micro control unit transmits the speed, torque and power of the motor to the vehicle control unit; The vehicle control unit controls the operation quantity of the motor according to the speed, torque and power of the motor; The vehicle control unit sends a control instruction to the micro control unit; The micro control unit controls the operation of the motor according to the control instruction.

10. The control method of the vehicle power device according to claim 9, wherein: The vehicle control unit controls the running quantity of the motor according to the speed, torque and power of the motor, including: In the driving mode, it is determined whether the rotation speed of the motor is less than or equal to the rated rotation speed; when the rotation speed of the motor is less than or equal to the rated rotation speed, the torque interval of the motor is determined, and when the torque of the motor is less than or equal to 1 / N of the rated torque, one motor is operated, when the torque of the motor is greater than (X-1) / N of the rated torque and less than or equal to X / N of the rated torque, X motors are operated, and when the torque of the motor is greater than (N-1) / N of the rated torque, N motors are operated; When the speed of the motor is greater than the rated speed, the power range of the motor is judged. When the power of the motor is less than or equal to 1 / N of the rated power, one motor is operated. When the power of the motor is greater than (X-1) / N of the rated power and less than or equal to X / N of the rated power, X motors are operated. When the power of the motor is greater than (N-1) / N of the rated power, N motors are operated. N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

11. The control method of a vehicle power device according to claim 9 or 10, wherein: The vehicle control unit controls the running quantity of the motor according to the speed, torque and power of the motor, including: In the braking mode, determine whether the rotation speed of the motor is less than or equal to the peak torque inflection point rotation speed; when the rotation speed of the motor is less than or equal to the peak torque inflection point rotation speed, determine the interval in which the torque of the motor is located, and when the torque of the motor is less than 1 / N of the peak torque, operate one motor; when the torque of the motor is greater than or equal to (X-1) / N of the peak torque and less than X / N of the peak torque, operate X motors; when the torque of the motor is greater than or equal to (N-1) / N of the peak torque, operate N motors; When the speed of the motor is greater than the peak torque inflection point speed, the power interval of the motor is judged. When the power of the motor is less than 1 / N of the peak power, one motor is operated. When the power of the motor is greater than or equal to (X-1) / N of the peak power and less than X / N of the peak power, X motors are operated. When the power of the motor is greater than or equal to (N-1) / N of the peak power, N motors are operated. N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

12. The control method of a vehicle power device according to any one of claims 9 to 11, wherein: Each power system further includes: a battery management system connected to the vehicle control unit and the battery respectively; the control method of the vehicle power device further includes: The battery management system transmits the charge state value of the battery to the vehicle control unit; The vehicle control unit controls the operation of the motor according to the state of charge value of the battery.

13. The control method of a vehicle power device according to claim 12, wherein: The vehicle power device includes three power systems, and the vehicle control unit controls the operation of the motor according to the charge state value of the battery, including: In the driving mode, when the number of the motors in operation is 1, the motor corresponding to the battery with the largest state of charge value is selected for driving, and when the difference between the maximum state of charge value and the intermediate state of charge value is greater than or equal to a first threshold, the motor corresponding to the battery with the largest state of charge value is reselected for driving; when the number of the motors in operation is 2, the motors corresponding to two batteries with relatively large state of charge values ​​are selected for driving, and when the difference between the intermediate state of charge value and the minimum state of charge value is greater than or equal to the first threshold, the motors corresponding to two batteries with relatively large state of charge values ​​are reselected for driving; In the braking mode, when the number of the running motors is 1, the motor corresponding to the battery with the smallest charge state value is selected for braking, and when the difference between the intermediate charge state value and the minimum charge state value is greater than or equal to a first threshold value, the motor corresponding to the battery with the smallest charge state value is reselected for braking; when the number of the running motors is 2, the motors corresponding to two batteries with relatively small charge state values ​​are selected for braking, and when the difference between the maximum charge state value and the intermediate charge state value is greater than or equal to the first threshold value, the motors corresponding to two batteries with relatively small charge state values ​​are reselected for braking.

14. The control method of the vehicle power device according to claim 12, wherein: The vehicle power device includes three power systems, and the vehicle control unit controls the operation of the motor according to the charge state value of the battery, including: The battery charge state value interval is judged so that the motor corresponding to the battery with a charge state value less than the second threshold is not operated in the forward drive mode, and the motor corresponding to the battery with a charge state value greater than or equal to the third threshold is not operated in the braking mode.

15. The control method of a vehicle power device according to claim 12, wherein: The vehicle power device includes three power systems, and the control method of the vehicle power device also includes: The micro control unit transmits the motor temperature of the motor to the vehicle control unit; The vehicle control unit enables a motor whose motor temperature is in a first temperature range to operate normally, enables a motor whose motor temperature is in a second temperature range to operate at reduced power, and enables a motor whose motor temperature is in a third temperature range to not operate.

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