CN116788061B - A vehicle power device, a vehicle power device control method and a vehicle - Google Patents

Abstract

The present invention relates to the field of vehicle technologies, and in particular, to a vehicle power device, a control method of the vehicle power device, and a vehicle. The vehicle power device includes: a vehicle control unit and a plurality of powertrain systems, each powertrain system comprising: a battery for supplying power; a motor for providing power using electric power of the battery; the micro control unit is respectively connected with the battery, the motor and the vehicle control unit and is used for supplying the electric power of the battery to the motor and transmitting the rotating speed, the torque and the power of the motor to the vehicle control unit; the motors of the power systems are connected in series, and the vehicle control unit is used for controlling the running quantity of the motors according to the rotating speed, the torque and the power of the motors and sending control instructions to the micro-control unit so that the micro-control unit controls the running of the motors according to the control instructions. The problem that the running number of the motor cannot be flexibly controlled can be solved; the efficiency can be improved to a certain extent, the loss of the motor and the battery is reduced, and the service life is prolonged.

Description

A vehicle power device, a vehicle power device control method and a vehicle

Technical field

The present invention relates to the field of vehicle technology, and in particular, to a vehicle power device, a control method of the vehicle power device, and a vehicle.

Background technique

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

In the related art, although the vehicle power device can provide power through multiple motors, and each motor is configured with a battery, multiple motors are run at the same time in order to improve the state consistency of the multiple batteries, which results in the inability to flexibly control the motors. Running quantity, multiple motors running at the same time will also lead to reduced efficiency.

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

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

To this end, the present invention provides a vehicle power device that can flexibly control the number of motor operations and improve efficiency. The invention also provides a control method for a vehicle power device and a vehicle.

A vehicle power device according to the first aspect of the present invention includes a vehicle control unit and a plurality of power systems. Each power system includes: a battery for providing power; a motor for using the power of the battery to provide power; a micro control unit , respectively connected to the battery, motor and vehicle control unit, used to provide battery power to the motor, and transmit the motor's speed, torque and power to the vehicle control unit; the motors of each power system are connected in series, and the vehicle control unit is used to The rotation speed, torque and power of the motor are used to control the operation quantity of the motor, and control instructions are sent to the micro control unit so that the micro control unit controls the operation of the motor according to the control instructions.

Optionally, the vehicle control unit is also used to: in the drive mode, determine whether the motor's speed is less than or equal to the rated speed; when the motor's speed is less than or equal to the rated speed, determine the range of the motor's torque. When the motor's torque When the torque of the motor is less than or equal to 1/N of the rated torque, one motor is allowed to run. 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 allowed to run. When the motor When the torque is greater than (N-1)/N of the rated torque, N motors are run; when the motor's speed is greater than the rated speed, the range of the motor's power is judged. When the motor's power is less than or equal to 1 of the rated power /N, make one motor run. When the motor's power is greater than (X-1)/N of the rated power and less than or equal to X/N of the rated power, make X motors run. When the motor's power is greater than the rated power of When (N-1)/N, make N motors run; N and X are natural numbers, N is greater than or equal to 3, X is greater than 1 and less than N.

Optionally, the vehicle control unit is also used to: in braking mode, determine whether the motor's speed is less than or equal to the peak torque inflection point speed; when the motor's speed is less than or equal to the peak torque inflection point speed, determine the range of the motor's torque. , when the torque of the motor is less than 1/N of the peak torque, make one motor run; 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, make X motors Operation, when the motor torque is greater than or equal to the peak torque (N-1)/N, make N motors run; when the motor speed is greater than the peak torque inflection point speed, judge the range of the motor's power. When the motor's When the power is less than 1/N of the peak power, make one motor run. 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, make X motors run. When the motor When the power is greater than or equal to (N-1)/N of the peak power, N motors are run; N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

Optionally, 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 charge state value to the vehicle control unit. The vehicle control unit is also used to: according to the battery's charge state value to control the operation of the motor.

Optionally, the vehicle power device includes three power systems, and the vehicle control unit is also used to: in the drive 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 the first threshold, the motor corresponding to the battery with the largest charge state value is re-selected for driving; when the number of running motors is 2, select The motors corresponding to the two batteries with relatively large charge state values are used 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 battery with a relatively large charge state value is re-selected. Motors corresponding to the two 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 the intermediate charge state value is equal to When the difference between the minimum charge state values is greater than or equal to the first threshold, reselect the motor corresponding to the battery with the smallest charge state value for braking; when the number of running motors is 2, select the battery with the smallest charge state value for braking. The motors corresponding to the two batteries are used 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, the two batteries corresponding to the relatively small charge state value are re-selected. The motor is used for braking.

Optionally, the vehicle power device includes three power systems, and the vehicle control unit is also used to determine the range of the battery's charge state value, so that the motor corresponding to the battery whose charge state value is less than the second threshold is driven in the forward direction. It is not operated in the braking mode, so that the motor corresponding to the battery whose charge state value is greater than or equal to the third threshold is not operated in the braking mode.

Optionally, the vehicle power device includes three power systems. 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: make the motor with the motor temperature in the first temperature range operate normally, The motor whose temperature is in the second temperature range is made to operate at reduced power, and the motor whose temperature is in the third temperature range is not operated.

A vehicle according to a second aspect of the invention includes the vehicle power plant of the first aspect or implementations thereof.

According to a third aspect of the present invention, 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 microcontrol unit and a motor connected in sequence. The microcontrol unit also Connected to the vehicle control unit, the motors of each power system are connected in series. The control method of the vehicle power unit includes: the micro control unit transmits the motor's speed, torque and power to the vehicle control unit; the vehicle control unit controls the motor according to the motor's speed, torque and power. To control the running quantity of the motor; the vehicle control unit sends control instructions to the micro control unit; the micro control unit controls the operation of the motor according to the control instructions.

Optionally, the vehicle control unit controls the operating quantity of the motor based on the motor's speed, torque and power, including: in the drive mode, determining whether the motor's speed is less than or equal to the rated speed; when the motor's speed is less than or equal to the rated speed, Determine the range of the motor's torque. When the motor's torque is less than or equal to 1/N of the rated torque, a motor is run. When the motor's torque is greater than (X-1)/N of the rated torque and less than or equal to the rated torque. When Make a judgment. When the power of the motor is less than or equal to 1/N of the rated power, make one motor run. 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, make it run. X motors are running. When the power of the motor is greater than (N-1)/N of the rated power, N motors are allowed to run; N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

Optionally, the vehicle control unit controls the operating quantity of the motor based on the motor's speed, torque and power, including: in braking mode, the vehicle control unit determines whether the motor's speed is less than or equal to the peak torque inflection point speed; when the motor's speed is less than When the inflection point speed of the peak torque is equal to the peak torque, determine the range of the motor's torque. When the motor's torque is less than 1/N of the peak torque, run one motor. When the motor's torque is greater than or equal to the peak torque (X-1) /N and less than the peak torque X/N, make X motors run; when the motor torque is greater than or equal to the peak torque (N-1)/N, make N motors run; when the motor speed is greater than the peak torque inflection point When rotating speed, the vehicle control unit determines the range of the motor's power. When the motor's power is less than 1/N of the peak power, one motor is allowed to run. When the motor's power is greater than or equal to (X-1)/N of the peak power, When N is smaller than X/N of the peak power, make X motors run. When the motor power is greater than or equal to (N-1)/N of the peak power, make N motors run; N and 3. X is greater than 1 and less than N.

Optionally, 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 The unit controls the operation of the motor based on the battery's state of charge value.

Optionally, the vehicle power device includes three power systems. The vehicle control unit controls the operation of the motor according to the charge state value of the battery, including: in the drive mode, when the number of motors running is 1, the vehicle control unit controls the operation of the motor according to the charge state value. The motor corresponding to the largest battery is used for driving, 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, the motor corresponding to the battery with the largest charge state value is re-selected for driving; when 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 , reselect the motors corresponding to the two batteries with relatively large charge state values for driving; in braking mode, when the number of running motors is 1, select the motor corresponding to the battery with the smallest charge state value for driving Braking, 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 smallest charge state value is re-selected for braking; when the running number of the motor is 2 When stationary, 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, the motors corresponding to the charge states are re-selected. The motors corresponding to the two batteries with relatively small status values are used for braking.

Optionally, 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: judging the interval in which the battery charge state value is located, so that the charge state value is less than the second threshold. The motor corresponding to the battery is not operated in the forward driving mode, and the motor corresponding to the battery whose charge state value is greater than or equal to the third threshold is not operated in the braking mode.

Optionally, the vehicle power unit includes three power systems. 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 normalizes the motor whose motor temperature is in the first temperature range. Operation, the motor whose motor temperature is in the second temperature range is operated with reduced power, and the motor whose motor temperature is in the third temperature range is not operated.

One of the above technical solutions has the following advantages or beneficial effects:

For a vehicle power device of the present invention, 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; it can be controlled according to the rotation speed, torque and power of the motor. The number of running motors, since the number of running motors is controllable, can solve the problem of being unable to flexibly control the number of running motors; by running fewer motors, efficiency can be improved to a certain extent, motor and battery losses can be reduced, and service life can be improved.

The vehicle provided by the present invention includes the vehicle power device described above. Since the vehicle power device described above has the above technical effects, the vehicle including the vehicle power device should also have corresponding technical effects.

The control method of the vehicle power device provided by the present invention can be implemented based on the vehicle power device described above. Since the vehicle power device described above has the above technical effects, the control method implemented based on the vehicle power device should also have corresponding technical effects.

Description of the drawings

Figure 1 shows a schematic structural diagram of a vehicle power device according to an embodiment of the present invention;

Figure 2 shows a control flow chart of the driving mode according to an embodiment of the present invention;

Figure 3 shows a control flow chart of the braking mode according to one embodiment of the present invention;

Figure 4 shows a control flow chart for charge state balancing in the driving mode according to an embodiment of the present invention;

Figure 5 shows a control flow chart for charge state balancing in braking mode according to an embodiment of the present invention;

Figure 6 shows an implementation flow chart of policy selection according to an embodiment of the present invention;

FIG. 7 shows a flowchart of a control method for a vehicle power device according to an embodiment of the present invention.

Detailed ways

The inventor discovered during the research that in related technologies, the motor of the vehicle power device can convert electric power into power. Each of the multiple motors is connected to a battery. In order to improve the consistency of the battery status, multiple motors need to be operated at the same time, which will lead to a decrease in efficiency. Equipment such as large vehicles require relatively high power and relatively reliable power units. Vehicles such as mining trucks use manual shifting or AMT (Automated Mechanical Transmission, automatic mechanical transmission) and use non-direct drive power units, which will cause power interruption and pose safety risks when shifting gears on slopes when carrying loads. . When a power unit with a voltage of up to 900 volts is configured with a single motor, a relatively large current will be generated, which requires control components with stronger overcurrent capabilities and higher costs, which will lead to difficult and costly problems. A motor failure will cause the power unit to stop running.

In order to solve at least one of the technical problems existing in the prior art or related technologies, the present invention provides a vehicle power device, a control method of the vehicle power device, and a vehicle. The following describes a vehicle power device, a vehicle power device control method and a vehicle according to some embodiments provided by the present invention with reference to FIGS. 1 to 7 .

Referring to FIGS. 1 to 6 , a vehicle power device according to one embodiment of the present invention includes a vehicle control unit and multiple power systems. Each power system includes: a battery for providing power; and a motor for utilizing the battery. Electricity is used to provide power; the micro control unit is connected to the battery, motor and vehicle control unit respectively, and is used to provide battery power to the motor and transmit the motor's speed, torque and power to the vehicle control unit; the motors of each power system are connected in series Connection, the vehicle control unit is used to control the operating quantity of the motor according to the motor's speed, torque and power, and send control instructions to the micro control unit, so that the micro control unit controls the operation of the motor according to the control instructions.

It should be noted that FIG. 1 shows an embodiment including three power systems, and is not used to limit the scope of the present invention. The vehicle power device 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 axle, etc., to realize a direct-drive power device for direct-drive driving. For example, as shown in FIG. 1 , the first motor, the second motor and the third motor connected in series may be connected to the reducer 200 , and the reducer 200 may 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), where the first motor, the first An 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, which will not be described again here.

In an exemplary embodiment, the first BMS, the second BMS, the third BMS, the first MCU, the second MCU, the third MCU, VCU (Vehicle Controller Unit, vehicle control unit), shift handle, accelerator, and retarder handle , foot brake and hand brake can be connected through CAN (Controller Area Network, Controller Area Network). The VCU can send control instructions to the corresponding MCU to control the corresponding motor. BMS can monitor the battery status; MCU can monitor the motor status and provide power to the motor. The three power systems here can be considered as parallel. The total output voltage of the three power systems can be 600V. Since multiple batteries are provided, multiple guns can be charged simultaneously to save charging time. Multiple motors are driven in series, which can reduce or even avoid power interruptions, thereby improving system reliability, improving system stability, and reducing safety hazards. Since the number of running motors can be controlled, the combined work of different motors can be realized, thereby achieving the effect of flexibly selecting motors. As needed, a smaller number of motors can be used, thereby increasing efficiency. In addition, it can also make the motor run in a stable and efficient state, thereby further improving stability and efficiency and reducing energy consumption. Compared with three motors running at the same time, the efficiency of a single motor will be increased by 20% or even higher. Since multiple motors and corresponding batteries share the voltage and current of the vehicle power unit, the control complexity of the vehicle power unit can be reduced and can be implemented using relatively low-cost components, making it easier to implement and lower cost. In the case of multiple motors connected in series, when there is a motor that is shut down due to a fault, a motor in a non-faulty state can be selected for operation, thereby reducing the fault shutdown rate.

Further, the vehicle control unit is also used to: in the driving mode, determine whether the motor's speed is less than or equal to the rated speed; when the motor's speed is less than or equal to the rated speed, determine the range of the motor's torque. When the motor's torque is less than When it is equal to 1/N of the rated torque, make one motor run. When the motor's torque is greater than (X-1)/N of the rated torque and less than or equal to X/N of the rated torque, make X motors run. When the motor's When the torque is greater than (N-1)/N of the rated torque, N motors are run; when the motor speed is greater than the rated speed, the range of the motor's power is judged. When the motor power is less than or equal to 1/ of the rated power When N, make one motor run. When the motor's power is greater than (X-1)/N of the rated power and less than or equal to X/N of the rated power, make X motors run. When the motor's power is greater than (X-1)/N of the rated power, When N-1)/N, make N motors run; N and X are natural numbers, N is greater than or equal to 3, X is greater than 1 and less than N.

For example, in the drive mode, determine whether the motor's speed is less than or equal to the rated speed; when the motor's speed is less than or equal to the rated speed, determine the range of the motor's torque. When the motor's torque is less than or equal to 1/ of the rated torque, When N, one motor is allowed to run. When the motor's 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 allowed to run. By analogy, when the motor's torque is greater than the rated torque ( When N-1)/N, make N motors run; when the motor speed is greater than the rated speed, judge the range of the motor's power. When the motor power is less than or equal to 1/N of the rated power, make 1 motor run. The motor is running. When the power of the motor is greater than 1/N of the rated power and less than or equal to 2/N of the rated power, two motors are allowed to run. By analogy, when the power of the motor is greater than (N-1)/N of the rated power When, make N motors run; N is a natural number, N is greater than or equal to 3, and N is the total number of motors.

For example, if the current vehicle power plant contains 3 motors, then the value of N is 3. First, determine the current speed of the motor. If the current speed is less than or equal to the rated speed of the motor, then judge the torque of the motor and the rated torque. The rated torque is divided into three equal parts to form three subsets. The torque of the motor belongs to one of the three subsets, corresponding to the operation of single motor, dual motor or triple motor in the vehicle power device. If the current speed is greater than the rated speed of the motor, the motor will be The power and rated power are judged, 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 single motor, dual motor, or triple motor in the vehicle power device.

In an exemplary embodiment, the work can be performed by selecting the number of motors that match a specific multiple rated power or a specific multiple rated torque, so that the operating number of motors can be reasonably distributed within a feasible range. When the motor efficiency shows a decreasing trend, the number of motors running can be increased or reduced in time. For example, specific multiplication rated torque and specific multiplication rated power can reflect the state of large changes in motor efficiency, and the motor operating quantity can be changed before large changes occur, thereby improving efficiency and operating stability as much as possible.

Further, the vehicle control unit is also used to: in braking mode, determine whether the motor's speed is less than or equal to the peak torque inflection point speed; when the motor's speed is less than or equal to the peak torque inflection point speed, determine the range of the motor's torque. When the motor's torque is less than 1/N of the peak torque, make one motor run. When the motor's torque is greater than or equal to (X-1)/N of the peak torque and less than X/N of the peak torque, make X motors run. , when the motor's torque is greater than or equal to the peak torque (N-1)/N, make N motors run; when the motor's speed is greater than the peak torque inflection point speed, judge the range of the motor's power. When the motor's power When the power of the motor is less than 1/N of the peak power, one motor is allowed to run. 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 allowed to run. When the power of the motor is When the power is greater than or equal to (N-1)/N of the peak power, N motors are run; N and X are natural numbers, N is greater than or equal to 3, and X is greater than 1 and less than N.

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; where the peak torque inflection point speed is the inflection point speed of the motor's external characteristic curve. When the motor's speed is less than or equal to the peak torque inflection point speed, the range of the motor's torque is judged. When the motor's torque is less than 1/N of the peak torque, one motor is run. When the motor's torque is greater than or equal to the peak torque When the torque of the motor is greater than or equal to (N-1)/N of the peak torque, N motors are allowed to run; when the motor's When the speed is greater than the peak torque inflection point speed, the range of the motor's power is judged. When the motor's power is less than 1/N of the peak power, one motor is run. When the motor's power is greater than or equal to 1/N of the peak power and When the power of the motor is less than 2/N of the peak power, two motors are allowed to run. By analogy, when the power of the motor is greater than or equal to (N-1)/N of the peak power, N motors are run. N is a natural number, and N is greater than or equal to 3. N is the total number of motors.

In an exemplary embodiment, the peak torque inflection point speed can be understood through the following description: the constant torque state refers to a constant output torque of the motor within a period of time; the constant power state refers to a constant output power of the motor within a period of time, and the motor changes from constant torque to The output speed when the state changes to the constant power state is the peak torque inflection point speed. Specifically, when the motor is started, the motor speed gradually increases, the motor output power gradually increases, the motor output torque remains unchanged, and the motor is in a constant torque state; the speed increases until the motor output power reaches the maximum value (i.e., peak value). power), it can be called the inflection point speed; then, as the speed continues to increase, the output torque of the motor begins to decrease, the output power of the motor remains at the peak power, and the motor is in a constant power state. In braking mode, the specific magnification peak torque and specific magnification peak power can reflect the state of large changes in motor efficiency, and the motor operating quantity can be changed before large changes occur, thereby improving efficiency and operating stability as much as possible.

For example, if the current vehicle power plant contains 3 motors, then the value of N is 3. Determine the current motor speed and the inflection point speed of the motor's external characteristic curve. If the current speed is less than or equal to the inflection point speed of the external characteristic curve, the braking demand is The torque is judged against the peak torque of the assembly, and the peak torque of the assembly 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 single motor, dual motor, or triple motor 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 single motor, dual motor, and triple motor operation in the powertrain.

In the exemplary embodiment, FIG. 2 and FIG. 3 correspond to the driving mode and the braking mode respectively. Although these drawings take three motors as an example for illustration, the embodiment can be expanded to more motors and can achieve corresponding The technical effects will not be described here.

Further, 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 SOC (State of Charge, state of charge value) of the battery to the vehicle control unit. The vehicle control unit is also used to : Control the operation of the motor based on the battery's state of charge value.

In an exemplary embodiment, the charge state value can reflect the percentage of the remaining battery power in the total power, that is, the battery power consumption. According to the battery power consumption, the operating state of the motor can be changed in time, thereby changing the operating state of the battery, thereby changing the operating state of the battery. Make the battery power meet the needs and achieve the effect of flexibly controlling the battery power.

Further, 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 the first threshold, the motor corresponding to the battery with the largest charge state value is re-selected for driving; when the number of running motors is 2, the motor corresponding to the battery with the largest charge state value is selected for driving. The motors corresponding to the two batteries with relatively large charge state values are used 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 two batteries with relatively large charge state values are re-selected. Motors corresponding to each battery 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 the intermediate charge state value is the same as the smallest one. When the difference between the charge state values is greater than or equal to the first threshold, the motor corresponding to the battery with the smallest charge state value is re-selected for braking; when the number of running motors is 2, the motor with the relatively smaller charge state value is selected. The motors corresponding to the two batteries are used 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, the two batteries corresponding to the relatively small charge state value are re-selected. The motor is used for braking.

It should be noted that the charge state values of the three batteries can be sorted, and in order from small to large, 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 balancing, the motor that needs to be run can be selected or switched by comparing the state of charge values, thereby making the operation of multiple batteries The state-of-charge values are relatively balanced, achieving a reasonable distribution of battery power.

Exemplarily, the vehicle power device includes three power systems, and the vehicle control unit is also used to: determine the interval in which the battery's charge state value is located, so that the motor corresponding to the battery whose charge state value is less than the second threshold is driven in the forward direction. It is not operated in the braking mode, so that the motor corresponding to the battery whose charge state value is greater than or equal to the third threshold is not operated in the braking mode.

Further, the vehicle power device includes three power systems. 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: make the motor with the motor temperature in the first temperature range operate normally, so that The motor whose motor temperature is in the second temperature range operates with reduced power, so that the motor whose motor temperature is in the third temperature range does not run.

In an exemplary embodiment, referring to FIG. 6 , whether to control the motor based on the temperature of the motor or to control the motor based on the SOC value of the battery may be determined through policy selection. Reduced power operation of the motor can mean reducing the operating power of the motor to improve the operating stability of the motor in a low power state. Forward drive mode may represent a mode in which the vehicle drives forward. The first temperature interval may be less than 130°C, the second temperature interval may be greater than or equal to 130°C and less than 150°C, and the third temperature interval may be greater than or equal to 150°C. The first temperature interval, the second temperature interval and the third temperature interval may be continuous temperature intervals. The state of charge value can be used to represent the remaining charge. The second threshold and the third threshold may be 20% and 85% respectively, indicating that the remaining power is 20% and 85% of the total power respectively. Temperature-based motor control can be performed first, and then motor control based on SOC value can be performed. Through the above operations, a motor with relatively high stability can be operated, thereby improving system stability.

In another embodiment, the vehicle power plant of the exemplary embodiment may be disposed in a vehicle. The vehicle may be a mining vehicle, a mining wide-body vehicle, a mining truck, etc. The mining vehicle may include a coal mining vehicle.

In another embodiment, as shown in FIG. 7 , an exemplary embodiment provides a control method of a vehicle power device. The vehicle power device includes a vehicle control unit and a plurality of power systems, each power system including batteries connected in sequence, Micro control unit and motor, the micro control unit is also connected to the vehicle control unit, and the motors of each power system are connected in series. Correspondingly, the control method of the vehicle power device includes:

S101, the micro control unit transmits the motor's speed, torque and power to the vehicle control unit;

S102, the vehicle control unit controls the operating quantity of the motor based on the motor's speed, torque and power;

S103, the vehicle control unit sends control instructions to the micro control unit;

S104, the micro control unit controls the operation of the motor according to the control instructions.

Further, the vehicle control unit controls the operating quantity of the motor according to the motor's speed, torque and power, including: in the drive mode, determining whether the motor's speed is less than or equal to the rated speed; when the motor's speed is less than or equal to the rated speed, the motor is To judge the torque range, when the motor's torque is less than or equal to 1/N of the rated torque, a motor is allowed to run. When the motor's torque is greater than (X-1)/N of the rated torque and less than or equal to X of the rated torque /N, make X motors run, when the motor torque is greater than the rated torque (N-1)/N, make N motors run; when the motor speed is greater than the rated speed, the vehicle control unit changes the power of the motor. Judgment is made in the interval. When the power of the motor is less than or equal to 1/N of the rated power, one motor is allowed to run. 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. , make X motors run. When the power of the motor is greater than (N-1)/N of the rated power, make N motors run; N and X are natural numbers, N is greater than or equal to 3, X is greater than 1 and less than N.

Further, the vehicle control unit controls the operating quantity of the motor based on the motor's speed, torque and power, including: in braking mode, determining whether the motor's speed is less than or equal to the peak torque inflection point; when the motor's speed is less than or equal to the peak torque inflection point When rotating speed, judge the range of the motor's torque. When the motor's torque is less than 1/N of the peak torque, make one motor run. When the motor's torque is greater than or equal to (X-1)/N of the peak torque and less than When the peak torque is Determine the range of the motor's power. When the motor's power is less than 1/N of the peak power, one motor is allowed to run. When the motor's power is greater than or equal to (X-1)/N of the peak power and less than X of the peak power. /N, make X motors run. When the motor power is greater than or equal to (N-1)/N of the peak power, make N motors run; N and X are natural numbers, N is greater than or equal to 3, X is greater than 1 and less than N.

Further, 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 The operation of the motor is controlled based on the battery's state of charge value.

Further, the vehicle power plant includes three power systems. 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, select the one with the largest charge state value. The motor corresponding to the battery is used for driving, 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, the motor corresponding to the battery with the largest charge state value is re-selected for driving; when the motor When the number of running units 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, Re-select the motors corresponding to the two batteries with relatively large charge state values for driving; in braking mode, when the number of running motors is 1, select the motor corresponding to the battery with the smallest charge state value for braking. 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 smallest charge state value is re-selected for braking; when the number of running motors is 2 When , 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, the charge state is re-selected. Two batteries with relatively small values correspond to motors used for braking.

Further, 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: judging the interval in which the charge state value of the battery is located, so that the charge state value is less than the second threshold. The motor corresponding to the battery is not operated in the forward driving mode, so that 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.

Further, the vehicle power plant includes three power systems. The control method of the vehicle power plant 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 whose motor temperature is in the first temperature range to operate normally. , causing the motor whose temperature is in the second temperature range to run at reduced power, and causing the motor whose temperature is in the third temperature range to not run.

Since the vehicle provided by the exemplary embodiments 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 again here.

Since the control method of the vehicle power device provided by the exemplary embodiment is implemented based on the vehicle power device of any of the above exemplary embodiments, the control method has all the beneficial effects of the vehicle power device provided by any of the above embodiments. The control method The implementation of the method can be implemented with reference to the vehicle power device embodiment, and will not be described again here.

In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless otherwise explicitly and specifically limited.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements. 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.

In the present invention, unless otherwise expressly stated and limited, a first feature is "on" or "below" a second feature, which may mean that the first and second features are in direct contact, or the first and second features are in direct contact through an intermediary. indirect contact. Furthermore, the terms "above", "above" and "above" the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. . The first feature being "below", "below" and "under" the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

In the description of this specification, the terms "one embodiment", "some embodiments", "embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples", etc., are used to describe It means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and should not be construed as limitations of the present invention. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present invention. The embodiments are subject to alterations, modifications, substitutions and variations.

Claims (7)

1. A vehicle power device, characterized in that it includes: a vehicle control unit and multiple power systems, each power system including: Batteries, used to provide electricity; A motor configured to utilize power from the battery to provide power; A microcontrol unit, respectively connected to the battery, the motor and the vehicle control unit, for providing power from the battery to the motor, and transmitting the rotation 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 operating quantity of the motor according to the rotation speed, torque and power of the motor, and send control instructions to the micro-control unit so that all The microcontrol unit controls the operation of the motor according to the control instructions; The vehicle control unit is also used to: in the driving mode, determine 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, determine the range of the torque of the motor, 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, Let X motors run. When the torque of the motor is greater than (N-1)/N of the rated torque, make N motors run; when the speed of the motor is greater than the rated speed, the power of the motor will be at the The interval is judged. When the power of the motor is less than or equal to 1/N of the rated power, one motor is allowed to run. When the power of the motor is greater than (X-1)/N of the rated power and less than or equal to X of the rated power. /N, make X motors run. When the motor power is greater than (N-1)/N of the rated power, make N motors run; N and X are natural numbers, N is greater than or equal to 3, X is greater than 1 and less than N; The vehicle control unit is also used to: in braking mode, determine whether the rotational speed of the motor is less than or equal to the peak torque inflection point speed; when the rotational speed of the motor is less than or equal to the peak torque inflection point speed, the torque of the motor is affected. Judgment is made in the interval. When the torque of the motor is less than 1/N of the peak torque, one motor is run. When the torque of the motor is greater than or equal to (X-1)/N of the peak torque and less than X of the peak torque /N, make X motors run; when the motor's torque is greater than or equal to (N-1)/N of the peak torque, make N motors run; when the motor's speed is greater than the peak torque inflection point speed , judge the range of the motor's power. When the motor's power is less than 1/N of the peak power, make one motor run. When the motor's power is greater than or equal to (X-1)/N of the peak power and less than When the peak power is Equal to 3, X is greater than 1 and less than N; Each power system also includes: a battery management system, respectively connected to the vehicle control unit and the battery, for transmitting the charge state value of the battery to the vehicle control unit, and the vehicle control unit is also used to : Control the operation of the motor according to the charge state value of the battery; 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 motors running is 1, select the motor corresponding to the battery with the largest charge state value for use. Drive, 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, re-select the motor corresponding to the battery with the largest charge state value for driving; when the running number of the motor is 2 At the same time, 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, the charge state is re-selected. The motors corresponding to the two batteries with relatively large values 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 the first threshold, the motor corresponding to the battery with the smallest charge state value is re-selected for braking; when the number of running motors is 2 , select the motors corresponding to the two batteries with relatively small charge state values 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, reselect the battery with the charge state value The two relatively small batteries correspond to motors used for braking. 2. The vehicle power device according to claim 1, wherein the vehicle control unit is further configured to determine the interval in which the charge state value of the battery is located, so that the battery corresponding to the charge state value is less than the second threshold. The motor is not operated in the forward driving mode, so that the motor corresponding to the battery whose charge state value is greater than or equal to the third threshold is not operated in the braking mode. 3. The vehicle power device according to claim 1, wherein the micro control unit is also used to transmit the motor temperature of the motor to the vehicle control unit, and the vehicle control unit is also used to: The motor whose motor temperature is in the first temperature range is allowed to operate normally, the motor whose motor temperature is in the second temperature range is made to run at reduced power, and the motor whose motor temperature is in the third temperature range is made not to run. 4. A vehicle, characterized by comprising the vehicle power plant according to any one of claims 1 to 3. 5. A method for controlling a vehicle power plant, characterized in that the vehicle power plant includes a vehicle control unit and a plurality of power systems, each power system including a battery, a microcontrol unit and a motor connected in sequence, and the microcontroller The unit is also connected to the vehicle control unit, and the motors of each of the power systems are connected in series. The control method of the vehicle power device includes: The micro control unit transmits the rotation speed, torque and power of the electric motor to the vehicle control unit; The vehicle control unit controls the operating quantity of the electric motor according to the rotation speed, torque and power of the electric motor; The vehicle control unit sends control instructions to the micro control unit; The microcontrol unit controls the operation of the motor according to the control instructions; The vehicle control unit controls the operating quantity of the motor according to the motor's speed, torque and power, including: in the driving mode, determining whether the motor's speed is less than or equal to the rated speed; when the motor's speed is less than When equal to the rated speed, judge the range of the motor's torque. When the motor's torque is less than or equal to 1/N of the rated torque, make one motor run. When the motor's torque is greater than (X- 1)/N and less than or equal to X/N of the rated torque, make X motors run; when the motor torque is greater than (N-1)/N of the rated torque, make N motors run; when the When the speed of the motor is greater than the rated speed, determine the range of the motor's power. When the power of the motor is less than or equal to 1/N of the rated power, make one motor run. When the power of the motor is greater than the rated power When (X-1)/N is less than or equal to X/N of the rated power, make X motors run; when the power of the motor is greater than (N-1)/N of the rated power, make N motors Run; N and X are natural numbers, N is greater than or equal to 3, X is greater than 1 and less than N; The vehicle control unit controls the operating quantity of the motor according to the speed, torque and power of the motor, and further includes: in braking mode, determining whether the speed of the motor is less than or equal to the peak torque inflection point speed; when the When the motor's speed is less than or equal to the peak torque inflection point speed, the range of the motor's torque is judged. When the motor's torque is less than 1/N of the peak torque, one motor is run. When the motor's torque is greater than or equal to the above-mentioned When the peak torque (X-1)/N is less than the X/N of the peak torque, make X motors run. When the torque of the motor is greater than or equal to the peak torque (N-1)/N, make N One motor is running; when the motor's speed is greater than the peak torque inflection point speed, the range of the motor's power is judged. When the motor's power is less than 1/N of the peak power, one motor is run. When the motor When the 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 run. When the power of the motor is greater than or equal to (N-1) of the peak power /N, make N motors run; N and X are natural numbers, N is greater than or equal to 3, X is greater than 1 and less than N; Each power system also includes: a battery management system, respectively connected to the vehicle control unit and the battery; 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; 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. , 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 the first threshold, reselect the battery corresponding to the largest charge state value The motor is used 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 the battery between the intermediate charge state value and the minimum charge state value is When the difference is greater than or equal to the first threshold, the motors corresponding to the two batteries with relatively large charge state values are re-selected for driving; in the braking mode, when the number of running motors is one, the motors corresponding to the charge state values are selected. The motor corresponding to the battery with the smallest state value is used for braking, 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 smallest charge state value is reselected for use. Braking; when the number of running motors is 2, select the motors corresponding to the two batteries with relatively small charge state values for braking, and the difference between the maximum charge state value and the intermediate charge state value When the value is greater than or equal to the first threshold, the motors corresponding to the two batteries with relatively small charge state values are re-selected for braking. 6. The method of controlling a vehicle power plant according to claim 5, wherein the vehicle control unit controls the operation of the motor according to the charge state value of the battery, including: Determine the interval in which the battery's state of charge value is located, so that the motor corresponding to the battery whose state of charge value is less than the second threshold is not operated in the forward drive mode, and the motor corresponding to the battery whose state of charge value is greater than or equal to the third threshold is not operated in the forward driving mode. The motor is not operated in braking mode. 7. The control method of the vehicle power plant according to claim 5, characterized in that the control method of the vehicle power plant further includes: the microcontrol unit transmits the motor temperature of the electric motor to the vehicle control unit; The vehicle control unit causes the motor whose motor temperature is in the first temperature range to operate normally, causes the motor whose motor temperature is in the second temperature range to run at reduced power, and causes the motor whose motor temperature is in the third temperature range to not operate.