Dynamic Power Allocation for Electrical Drive Trains
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Solution Overview
Problem
Electrically driven working machines, such as wheel loaders and construction machines, face challenges in efficiently distributing power between traction and auxiliary drives, leading to reduced productivity due to limited power output and inefficient power allocation strategies.
Innovation Solution
A method for dynamically adjusting the power allocation between the traction and auxiliary drives of an electrical drive train in a working machine, based on the current working state, using sensors and a control device to determine actual and target power allocations, and automatically adjust them to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a percentage or residual power distribution strategy is used to allocate power between traction and auxiliary drives, then the power output of each drive is limited to match the power storage device capacity, but the productivity of the working machine is significantly diminished
Solution Approach 1:
The patent implements dynamic power distribution that continuously adapts to changing working conditions. The control system monitors sensor data (hydraulic pressure, flow rate, engine speed, load conditions) and dynamically adjusts power allocation between traction and auxiliary drives in real-time, transitioning from static percentage-based distribution to state-responsive dynamic distribution, thereby resolving the contradiction between stable power allocation and productivity
Solution Approach 2:
The system changes the parameter of power distribution from fixed percentage values to variable values based on working state parameters. By monitoring parameters such as hydraulic system pressure, flow rate requirements, engine speed, and load conditions, the control device adjusts power allocation parameters dynamically, enabling the system to optimize productivity while maintaining power storage device constraints
2Power
If the total output of separately controllable traction and auxiliary drives exceeds the power storage device capacity, then each drive must be limited in output, but the working machine cannot achieve optimal performance in different situations
Solution Approach 1:
The patent applies local quality by providing different power allocation strategies for different working states. Instead of uniform power distribution, the system tailors power allocation to specific local conditions: during loading operations, more power is allocated to auxiliary drives; during travel, more power is allocated to traction drives. This localized optimization enables the system to overcome the limitations of total power output while maintaining adaptability to various operational situations
3Device complexity
If static power distribution strategies are used, then the control system is simple, but the traction behavior and productivity are significantly diminished depending on the situation
Solution Approach 1:
The patent implements feedback control by continuously monitoring working state parameters (hydraulic pressure, flow rate, engine speed, load conditions) and using this feedback to adjust power distribution in real-time. The control device receives sensor data, processes it to determine current working state, and dynamically adjusts power allocation accordingly, creating a closed-loop control system that enhances productivity while managing complexity through systematic feedback mechanisms
Data Source
AI summary
A method for distributing power of an electrical drive train of a working machine, wherein the drive train has a traction drive and an auxiliary drive, the method including determining an actual power allocation for the traction drive and an actual power allocation for the auxiliary drive and determining a current working state of the working machine. The method further includes specifying a target power allocation to the traction drive and a target power allocation to the auxiliary drive based on the determined current working state of the working machine and adjusting the actual power allocation for the traction drive to the target power allocation for the traction drive, and adjusting the actual power allocation for the auxiliary drive to the target power allocation for the auxiliary drive.