Pivotable Trolley Pole Transfer With Dynamic Speed Limiting
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Solution Overview
Problem
Current automatic trolley pole transfer systems for trolley buses experience overshooting issues due to inertia and elastic properties, leading to time-consuming and mechanically stressful operations when aligning with overhead lines.
Innovation Solution
A method that dynamically limits the setpoint speed based on positional deviation from the setpoint position value, using a control unit to adjust the speed dynamically to prevent overshooting by considering the actual position value and applying a stronger limitation for smaller deviations to avoid excessive speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic transfer is used to reduce manual operation time, then productivity is improved, but overshooting occurs due to inertia and elastic properties causing transfer errors
Solution Approach 1:
The control system dynamically adjusts the setpoint speed based on the current position and remaining distance to the target position. As the trolley pole approaches the overhead line, the system automatically reduces speed to prevent overshooting, while maintaining higher speeds during the initial transfer phase to improve productivity.
Solution Approach 2:
The system continuously monitors the actual position of the trolley pole and compares it with the setpoint position. Based on this feedback, the control unit dynamically calculates and adjusts the appropriate setpoint speed to ensure accurate positioning while maintaining efficient transfer.
2Productivity
If higher speed is used during transfer to reduce time, then productivity is improved, but mechanical load on overhead line increases
Solution Approach 1:
The system implements dynamic speed control where the setpoint speed varies continuously during the transfer process. High speed is maintained only when the trolley pole is far from the overhead line, reducing mechanical load. As it approaches, speed is automatically reduced to minimize impact forces.
Solution Approach 2:
The control system proactively reduces speed before the trolley pole reaches the overhead line, preventing excessive mechanical load. This preliminary speed reduction ensures that the transfer completes efficiently while protecting the overhead line from damaging forces.
3Measurement precision
If manual positioning is used to achieve accurate alignment, then positioning accuracy is improved, but transfer time increases
Solution Approach 1:
The control system continuously monitors the actual position and dynamically adjusts the setpoint speed based on the remaining distance to the target. This feedback mechanism enables automatic achievement of precise alignment without manual intervention, maintaining high transfer speed while ensuring accurate positioning.
Solution Approach 2:
The system performs self-positioning by automatically calculating the appropriate speed profile to reach the target position accurately. The control unit independently manages the entire transfer process, eliminating the need for manual positioning while achieving both speed and precision.
Data Source
AI summary
A method for automatically transferring at least one pivotable trolley pole, in particular of a trolleybus, from a start position into an end position which corresponds, in particular, to a contact position on an overhead line. The end position is assigned at least one setpoint position value, at least one actual position value of a current position of the trolley pole is detected, and the trolley pole is pivoted automatically about at least one axis. A setpoint speed is determined from a positional deviation of the detected actual position value from the setpoint position value, and a dynamic limitation to a dynamically limited setpoint speed is carried out in order to avoid overshooting when the end position is reached.A separate sheet setting forth the replacement Abstract is provided herewith.