Working Machine Drivetrain Control With Selectable Dynamic Classes
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Solution Overview
Problem
Existing drive train systems for working machines lack dynamic control over speed curves and tractive force, leading to inefficient operation and inadequate adaptation to varying application requirements, such as sensitive maneuvers or different terrains.
Innovation Solution
A method utilizing a control device connected via CAN interface to receive input commands, including brake status, pedal position, and dynamic classes, which map individual speed and tractive force curves, allowing dynamic adaptation of acceleration, deceleration, and reversing behaviors, and tractive power classes for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional drive train control system is used, then the system structure is simple, but the adaptability to different application requirements is insufficient
Solution Approach 1:
The control system dynamically adapts speed curves and tractive force characteristics based on selected dynamic classes (e.g., sensitive, normal, dynamic modes). The system transitions from static control to dynamic control by mapping different speed profiles over time for various operating conditions, enabling the drive train to respond flexibly to changing application requirements without requiring multiple fixed systems
Solution Approach 2:
The invention changes key operational parameters including speed curves, acceleration rates, and tractive force characteristics based on the selected dynamic class. By pre-defining multiple speed profiles and dynamically selecting among them, the system achieves high adaptability while maintaining a single control architecture, effectively managing the trade-off between versatility and complexity
2Productivity
If dynamic control of speed curves is implemented, then operational efficiency is improved, but control complexity increases
Solution Approach 1:
Multiple speed curves and dynamic classes are pre-defined and stored in the control device before operation. The system prepares various speed profiles (sensitive, normal, dynamic modes) in advance, allowing the control device to simply select from pre-computed options rather than calculating optimal curves in real-time, thus improving operational efficiency without proportionally increasing control complexity
Solution Approach 2:
The control device receives feedback from operating elements (brake status, pedal position, gearshift lever position) and automatically selects appropriate dynamic classes based on the current operating state. This feedback mechanism enables the system to adapt to varying operational requirements efficiently, maintaining high productivity while managing complexity through automated decision-making algorithms
3Adaptability or versatility
If multiple dynamic classes are predefined, then the adaptability to different terrains and maneuvers is enhanced, but the device complexity increases
Solution Approach 1:
A single control device is designed to handle multiple dynamic classes (sensitive, normal, dynamic modes) and various operating conditions (acceleration, deceleration, reversing, different terrains). By creating a universal control system that can perform multiple functions through software configuration rather than requiring separate hardware for each mode, the invention achieves high adaptability while minimizing the increase in physical device complexity
Data Source
AI summary
A method for operating a drive train of an electrically driven working machine having a control device that controls the drive train, including receiving and evaluating, via the control device, input commands from a vehicle computer via one respective CAN interface, wherein the input commands include at least a current brake status, a current pedal position, a current gearshift lever position and one of a plurality of predefined dynamic classes stored in the control device. The method further includes mapping an individual speed curve over time, and driving the drive train depending on the one dynamic class that is transmitted to the control device and selected via a respective input command of the input commands.