Traction Drive Gear Ratio Control for Stable Tractive Force
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Solution Overview
Problem
Existing electrically driven work machines experience interruptions in tractive force due to changes in gear ratios, leading to unstable driving behavior and insufficient power supply to work devices, which are not effectively addressed by current systems.
Innovation Solution
A traction drive system with a controller that selects a gear ratio based on expected changes in motor output, using operating parameters to minimize interruptions in tractive force and optimize performance by anticipating and adjusting gear ratios accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If gear ratio changes are implemented in existing electrically driven work machines, then transmission adaptability is improved, but tractive force stability deteriorates due to interruptions
Solution Approach 1:
The controller predicts future motor output based on current operating parameters and anticipated gear ratio changes. By performing this prediction in advance, the system can proactively adjust the gear ratio selection to prevent tractive force interruptions, rather than reactively responding after the interruption occurs.
Solution Approach 2:
The system dynamically adjusts gear ratio selection based on real-time operating parameters and predicted future conditions. The controller continuously monitors motor output, operating parameters, and anticipated gear ratio changes, adapting the gear ratio decision-making process to current system state rather than using fixed switching criteria.
2Speed
If gear ratio switching is performed based on current operating conditions, then response speed is improved, but power supply stability deteriorates due to interruptions in tractive force
Solution Approach 1:
The controller performs predictive analysis of motor output based on current operating parameters before executing gear ratio changes. This preliminary assessment allows the system to anticipate the impact of upcoming gear ratio transitions and adjust timing or selection to maintain continuous power supply, rather than switching based solely on current instantaneous conditions.
Solution Approach 2:
The system uses feedback from monitored operating parameters to continuously refine gear ratio selection decisions. By monitoring actual motor output, operating conditions, and the effects of previous gear ratio changes, the controller adapts future switching decisions to maintain stable power supply while responding to changing operational requirements.
Data Source
AI summary
A traction drive system for a work machine, including at least one electric motor, a transmission, and a controller. The controller is configured to select a gear ratio of the transmission depending on a change to be expected in a motor output of the at least one electric motor. The change to be expected in the motor output is conditional on a change in the gear ratio of the transmission. The change to be expected in the motor output is determined on the basis of at least one operating parameter of the work machine.