Tyre Changer Torque Control for High-Speed Rim Protection
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Solution Overview
Problem
Existing tyre changing apparatuses face issues with excessive working torque and damage due to operator inexperience, and existing torque-limiting functions are inflexible and do not account for varying rotation speeds, leading to safety concerns and reduced flexibility.
Innovation Solution
A tyre changing apparatus with a controller that adjusts power supply parameters to control torque and rotation speed, allowing conditional activation of a torque-limiting function based on user input and rotation speed, ensuring safe operation while maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a torque-limiting function is applied to prevent excessive working torque, then tyre damage is avoided, but the apparatus cannot handle rigid or heavy tyres requiring high torque
Solution Approach 1:
The torque limiting function is made dynamic by linking it to rotation speed detection. The system automatically adjusts torque limits based on the detected rotation speed, allowing high torque at low speeds for heavy tyres while preventing excessive torque at high speeds that could damage tyres.
Solution Approach 2:
The system changes the torque parameter dynamically based on rotation speed. By detecting rotation speed and comparing it to reference values, the system adjusts the torque limit parameter to match the appropriate working conditions, enabling both tyre protection and handling capability.
2Reliability
If maximum torque is calibrated for reduced speed, then safety is improved, but flexibility is reduced at higher rotation speeds
Solution Approach 1:
The torque calibration is made dynamic rather than fixed. The system detects rotation speed and automatically selects appropriate torque limits from multiple reference values, enabling safe operation across varying speeds while maintaining flexibility to adapt to different working conditions.
Solution Approach 2:
The torque parameter is changed based on rotation speed detection. The system maintains multiple torque reference values corresponding to different speed ranges and selects the appropriate one dynamically, ensuring safety at each speed while providing flexibility across the full operating range.
3Ease of operation
If separate controls are provided for different rotation speeds, then speed control flexibility is improved, but the maximum deliverable torque remains indiscriminate and too high at high speeds
Solution Approach 1:
The system uses feedback from rotation speed detection to automatically adjust torque limits. The detection unit continuously monitors rotation speed and feeds this information to the control unit, which then applies appropriate torque limiting based on the detected speed, preventing excessive torque at high speeds while maintaining control flexibility.
Solution Approach 2:
The torque parameter is automatically changed based on detected rotation speed. The system compares detected speed with reference speed values and adjusts the torque limit parameter accordingly, eliminating the need for manual torque adjustment while providing speed-dependent torque control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus prevents excessive torque at high speeds while enabling high torque at controlled speeds, enhancing safety and flexibility in tyre mounting and demounting operations.
Implementation Method 1
an electric motor (13) connected to the chuck (11) to impart a rotation speed and a working torque to it
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A tyre changing apparatus (1) for demounting and mounting a tyre relative to a respective rim of a vehicle wheel (2) comprises: a frame (10); a chuck (11), connected to the frame (10) to rotate about an axis of rotation (A); a working tool (12), connected to the frame (10) and movable towards and away from the chuck; an electric motor (13), connected to the chuck (11) to impart a rotation speed and a working torque to it; a controller (14), including a power unit (141) configured to supply voltage and current as a function of a drive signal (101); a processing unit (142) configured to generate the drive signal (101) and programmed to derive a control parameter (102) representing the working torque delivered to the electric motor (13) and to apply a torque-limiting function as a function of the control parameter (102). The processing unit (142) is programmed to derive an activation parameter and, as a function of the activation parameter, to switch between an activated configuration, in which the torque-limiting function is enabled, and a deactivated configuration in which the torque-limiting function is disabled.