Reversing Clutch Control for Power-Split Transmissions
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Solution Overview
Problem
Automated reversing processes in working machines with power-split transmissions are inefficient due to fixed control parameters, leading to unpredictable vehicle behavior, increased wear on reversing clutches, and reduced productivity, as they do not account for varying load conditions and external influences.
Innovation Solution
A method and control device that dynamically adjust the reversing process by measuring load-dependent factors such as hydraulic pressure or motor torque to determine the required torque for reversing clutches, adapting to inclines, vehicle load, and external influences like brakes and hybridization devices, allowing for optimized torque application and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed control parameters are used for automated reversing, then the reversing process is simple to implement, but the vehicle behavior becomes unpredictable and wear on reversing clutches increases
Solution Approach 1:
The patent applies dynamics by transitioning from fixed control parameters to dynamically adjustable control parameters that adapt in real-time based on actual operating conditions. The control unit continuously monitors variables such as vehicle speed, acceleration, and clutch slip, then adjusts control parameters accordingly to optimize the reversing process for each specific situation, making the system both reliable and adaptive.
Solution Approach 2:
The patent implements feedback mechanisms where sensors monitor the actual reversing process parameters (clutch slip, vehicle acceleration, transmission ratio) and feed this information back to the control unit. The control unit then adjusts control parameters based on this feedback to maintain optimal reversing performance, reduce clutch wear, and ensure predictable vehicle behavior under varying conditions.
2Device complexity
If fixed control parameters are used for automated reversing, then the control system is simple, but productivity and reversing quality decrease
Solution Approach 1:
The control system transitions from static fixed parameters to dynamic parameter adjustment based on real-time monitoring of reversing conditions. The control unit adapts control parameters such as clutch engagement timing and transmission ratio changes based on actual vehicle response, thereby optimizing reversing quality and productivity without excessive complexity.
Solution Approach 2:
The patent changes the parameters of the control system from fixed values to variable values that are continuously adjusted during the reversing process. Control parameters such as clutch slip limits, acceleration rates, and transmission ratio steps are modified based on monitored conditions, enabling optimized reversing performance that improves productivity while maintaining manageable system complexity.
3Stability of the object's composition
If fixed control parameters are used, then the reversing process follows a standard procedure, but wear on reversing clutches is substantially increased
Solution Approach 1:
The patent uses feedback from sensors monitoring clutch slip and transmission behavior to adjust control parameters in real-time. This feedback mechanism allows the system to maintain consistent reversing procedures while adapting to actual conditions, thereby reducing excessive clutch wear caused by fixed parameters that do not account for variations in load, speed, and mechanical state.
Solution Approach 2:
The control parameters are changed from fixed values to dynamically adjusted values that respond to actual reversing conditions. By monitoring clutch slip and adjusting control parameters such as engagement timing and slip limits, the system maintains procedural consistency while minimizing harmful wear on reversing clutches through adaptive parameter modification.
4Adaptability or versatility
If driver intervention is used to influence reversing, then the reversing process can be adapted to conditions, but the operation becomes less automated and more dependent on driver estimation
Solution Approach 1:
The patent implements self-service by enabling the control system to automatically monitor and adjust control parameters based on sensor feedback without requiring driver intervention. The system independently adapts to reversing conditions by monitoring variables such as clutch slip, vehicle acceleration, and transmission ratio, thereby maintaining high automation while achieving adaptability to varying operating conditions.
Data Source
AI summary
A reversing method for reversing a travel direction of a working machine with a power-split transmission in which control signals are emitted by a control unit such that a reversing clutch, for the current travel direction, is disengaged and a reversing clutch for the new travel direction is engaged. The reversing clutches are controlled by control variables. If there is a difference between a reference control magnitude and a target control variable, the control variable is adapted. An adapted control signal is emitted, with which the reversing clutches are actuated, and for determining the target control variables for the disengaging and engaging of the reversing clutches, in addition to a translational factor and a rotational factor a load-dependent factor is determined and processed.