CN-122009141-A - Power coordination control method and device for dual-motor-hydraulic coaxial series range-extending system and vehicle

CN122009141ACN 122009141 ACN122009141 ACN 122009141ACN-122009141-A

Abstract

The application provides a power coordination control method and device of a double-motor hydraulic coaxial serial range-extending system and a vehicle, and relates to the technical field of vehicle range-extending systems; the method comprises the steps of determining a set rotating speed of a speed regulating unit according to first required power, carrying out power distribution according to current operation information and the first required power, obtaining set torque of a torque regulating unit, wherein the torque regulating unit comprises at least one of a first range-increasing motor, a second range-increasing motor and an engine, and generating control signals according to the set rotating speed and the set torque of each torque regulating unit so as to control the first range-increasing motor, the second range-increasing motor and the engine to operate.

Inventors

SHAO CHANGJIANG
SUN MINGFENG
LIAN FENGXIA
WANG QINGYUN
JIANG FENG

Assignees

潍柴动力股份有限公司
潍柴新能源动力科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251217

Claims (10)

1. The power coordination control method of the double-motor-hydraulic coaxial series stroke-increasing system is characterized in that the double-motor-hydraulic coaxial series stroke-increasing system comprises a first stroke-increasing motor, a second stroke-increasing motor and an engine, wherein the engine is coaxially connected with the first stroke-increasing motor and the second stroke-increasing motor through a coupler, and the first stroke-increasing motor and the second stroke-increasing motor are coaxially connected with the hydraulic system in series, and the method comprises the following steps: Collecting current operation information of a double-motor-hydraulic coaxial series-connection range-extending system, and determining first required power of the double-motor-hydraulic coaxial series-connection range-extending system; Determining a set rotating speed of a speed regulating unit according to the first required power, wherein the speed regulating unit is the first range-extending motor or the engine; performing power distribution according to the current running information and the first required power to obtain set torque of a torque adjusting unit, wherein the torque adjusting unit comprises at least one of the first range-extending motor, the second range-extending motor and the engine; And generating control signals according to the set rotating speed and the set torque of each torque regulating unit so as to control the first range-increasing motor, the second range-increasing motor and the engine to operate.
2. The method of claim 1, wherein if the dual-motor-hydraulic in-line series range-extending system is operating in a first control mode, the first control mode is the engine torque control, the first range-extending motor speed torque control, the second range-extending motor torque control, and wherein the performing power distribution according to the current operating information and the first required power to obtain the set torque of the torque adjusting unit comprises: Determining a power generation mode of the double-motor hydraulic coaxial serial range-extending system according to the first required power, wherein the power generation mode comprises an economic power generation mode and a standard power generation mode, the economic power generation mode is used for generating power for the first range-extending motor, and the standard power generation mode is used for generating power for the first range-extending motor and the second range-extending motor; If the dual-motor-hydraulic coaxial series stroke-increasing system adopts an economic power generation mode, distributing set torques of the first stroke-increasing motor and the engine according to the current running information and the first required power; And if the dual-motor-hydraulic coaxial serial range-extending system adopts the standard power generation mode, distributing set torques of the first range-extending motor, the second range-extending motor and the engine according to the current running information and the first required power.
3. The method of claim 2, wherein said distributing the set torque of the first range motor and the engine based on the current operating information and the first demanded power comprises: determining an upper torque limit of the first range motor based on a maximum discharge capacity of the battery and an actual torque of the first range motor; determining initial set torque of the engine according to total required power of a range-extending load, wherein the range-extending load comprises the first range-extending motor, the second range-extending motor and the hydraulic system, and the total required power of the range-extending load is the sum of the first required power and the second required power of the hydraulic system; and calculating the limiting torque when the battery is overcharged, and determining the set torque of the engine as the smaller value of the limiting torque and the initial set torque.
4. The method of claim 2, wherein said distributing the set torque of the first extended-range motor, the second extended-range motor, and the engine according to the current operating information and the first demanded power comprises: Judging whether the second range-extending motor outputs negative torque, if not, returning to the step of determining the power generation mode of the double-motor-hydraulic coaxial series range-extending system according to the first required power; If the second range-extending motor outputs negative torque, determining that the upper torque limit of the first range-extending motor is zero; Calculating the set torque of the second range-extending motor according to the difference between the set rotating speed and the actual rotating speed of the first range-extending motor and the first required power; determining an initial set torque of the engine according to the sum of the first required power and the second required power of the hydraulic system and the difference between the set rotating speed and the actual rotating speed of the first range-increasing motor; and calculating the limiting torque when the battery is overcharged, and determining the set torque of the engine as the smaller value of the limiting torque and the initial set torque.
5. The method of claim 1, wherein if the dual-motor-hydraulic in-line tandem range-extending system is operating in a second control mode, the second control mode is the engine speed control, the first range-extending motor, and the second range-extending motor torque control, wherein the performing power distribution according to the current operating information and the first required power to obtain the set torque of the torque adjusting unit comprises: Acquiring total set torque of the first range-extending motor and the second range-extending motor according to the current running information and the first required power; Determining a power generation mode of the double-motor hydraulic coaxial serial range-extending system according to the first required power, wherein the power generation mode comprises an economic power generation mode and a standard power generation mode, the economic power generation mode is used for generating power for the first range-extending motor, and the standard power generation mode is used for generating power for the first range-extending motor and the second range-extending motor; if the double-motor-hydraulic coaxial series stroke-increasing system adopts an economic power generation mode, determining the set torque of the first stroke-increasing motor as the total set torque; and if the standard power generation mode is adopted by the double-motor-hydraulic coaxial serial range-extending system, distributing the total set torque to the first range-extending motor and the second range-extending motor in a preset proportion.
6. The method of claim 5, wherein the obtaining the total set torque of the first and second range-extending motors based on the current operating information and the first demanded power comprises: calculating a first total set torque of the first range-extending motor and the second range-extending motor according to the first required power and the set rotating speed; Correcting the first total set torque according to the difference between the set rotating speed and the actual rotating speed of the engine based on the load pulling process to obtain second total set torques of the first range-extending motor and the second range-extending motor; and correcting the second total set torque according to the total current of the hydraulic pump displacement based on lifting operation to obtain final total set torque of the first range-extending motor and the second range-extending motor.
7. The method of claim 1, wherein determining the set rotational speed of the governor unit based on the first required power comprises: Determining a control mode of the dual-motor-hydraulic coaxial series stroke-increasing system; If the dual-motor-hydraulic coaxial serial range-extending system works in a first control mode, determining a target rotating speed of the first range-extending motor according to the first required power, and determining a set rotating speed of the first range-extending motor by combining the required rotating speed of a hydraulic system, wherein the first control mode is the engine torque control, the first range-extending motor rotating speed torque control and the second range-extending motor torque control; And if the dual-motor-hydraulic coaxial serial range-extending system works in a second control mode, determining the target rotating speed of the engine according to the first required power, and determining the set rotating speed of the engine by combining the required rotating speed of the hydraulic system, wherein the second control mode is the engine rotating speed control, the first range-extending motor and the second range-extending motor torque control.
8. The power coordination control device of the double-motor-hydraulic coaxial serial range-extending system is characterized by comprising a first range-extending motor, a second range-extending motor and an engine, wherein the engine is coaxially connected with the first range-extending motor and the second range-extending motor through a coupler, and the first range-extending motor and the second range-extending motor are coaxially connected with a hydraulic system in series, and the device comprises: The information acquisition module is used for acquiring the current operation information of the double-motor-hydraulic coaxial serial range-extending system and determining the first required power of the double-motor-hydraulic coaxial serial range-extending system; The rotating speed control module is used for determining the set rotating speed of a speed regulating unit according to the first required power, wherein the speed regulating unit is the first range-extending motor or the engine; The torque control module is used for carrying out power distribution according to the current running information and the first required power to obtain the set torque of a torque adjusting unit, and the torque adjusting unit comprises at least one of the first range-extending motor, the second range-extending motor and the engine; And the output control module is used for generating control signals according to the set rotating speed and the set torque of each torque regulating unit so as to control the first range-increasing motor, the second range-increasing motor and the engine to operate.
9. A vehicle, characterized in that the vehicle comprises: a memory for storing an executable computer program; A processor for calling and running the executable computer program from the memory, such that the processor performs the method of any of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed, implements the method according to any of claims 1 to 7.

Description

Power coordination control method and device for dual-motor-hydraulic coaxial series range-extending system and vehicle Technical Field The application relates to the technical field of vehicle range-extending systems, in particular to a power coordination control method and device of a double-motor hydraulic coaxial series range-extending system and a vehicle. Background The dual-motor-hydraulic coaxial series stroke-increasing system has the problems Of strong coupling Of power generation and hydraulic power taking, the power taking requirement Of hydraulic loading needs to be met while power generation is ensured, economic power generation and operation requirement become main contradictions, the operation working condition and the change Of the residual electric quantity (State Of Charge, SOC) Of a battery provide higher challenges for the performance Of the stroke-increasing device and a control strategy, and the actual power calculation Of the hydraulic system has larger errors due to response delay and overflow loss Of a hydraulic valve Of the hydraulic system, so that the power adjustment Of the stroke-increasing device is further influenced, and the rotating speed is unstable. Disclosure of Invention In view of the above, the application provides a power coordination control method, a device and a vehicle of a double-motor-hydraulic coaxial serial range-increasing system, which are capable of preferentially ensuring the loading operation efficiency and simultaneously giving consideration to the power generation requirement, and improving the rotation speed stability and the disturbance rejection capability of a rotating shaft and reducing the risk of a coupler under the condition of inaccurate hydraulic power calculation. The power coordination control method of the double-motor-hydraulic coaxial serial range-extending system comprises the steps of collecting current operation information of the double-motor-hydraulic coaxial serial range-extending system, determining first required power of the double-motor-hydraulic coaxial serial range-extending system, determining set rotating speed of a speed regulating unit according to the first required power, performing power distribution according to the current operation information and the first required power, obtaining set torque of a torque regulating unit, wherein the torque regulating unit comprises at least one of the first range-extending motor, the second range-extending motor and the engine, and controlling the torque regulating unit according to the rotating speed of the first motor and the set rotating speed of the first motor, the second range-extending motor and the engine. In an embodiment of the application, if the dual-motor-hydraulic coaxial series stroke-increasing system works in a first control mode, the first control mode is the engine torque control, the first stroke-increasing motor rotating speed torque control and the second stroke-increasing motor torque control, the power distribution is carried out according to the current operation information and the first required power, the set torque of a torque regulating unit is obtained, the power generation mode of the dual-motor-hydraulic coaxial series stroke-increasing system is determined according to the first required power, the power generation mode comprises an economic power generation mode and a standard power generation mode, the economic power generation mode is the first stroke-increasing motor power generation mode, the standard power generation mode is the first stroke-increasing motor power generation mode and the second stroke-increasing motor power generation mode, if the dual-motor-hydraulic coaxial series stroke-increasing system adopts the economic power generation mode, the set torque of the first stroke-increasing motor and the engine is distributed according to the current operation information and the first required power, and if the dual-hydraulic coaxial series stroke-increasing system adopts the current operation information and the first required power, and the set torque of the first stroke-increasing motor is distributed according to the current operation information and the first required power. In an embodiment of the application, the step of distributing the set torques of the first range-extending motor and the engine according to the current running information and the first required power comprises the steps of determining the torque upper limit of the first range-extending motor based on the maximum discharging capacity of a battery and the actual torque of the first range-extending motor, determining the initial set torque of the engine according to the total required power of a range-extending load, wherein the range-extending load comprises the first range-extending motor, the second range-extending motor and the hydraulic system, the total required power of the range-extending load is the sum of the first required power and the second require