Power Tailgate Clutch Slip Detection for Position Reset
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power tailgate systems in vehicles can suffer from motor damage due to backdriving caused by external forces, and excessive slippage of the clutch can disrupt the synchronization between motor rotation and tailgate motion, leading to incorrect positioning of the tailgate.
Innovation Solution
A method for controlling a power tailgate system that includes determining if a clutch interposed between the motor and the tailgate has slipped by a predetermined amount during operation, and if so, generating an alert indicating the need for manual reset of the tailgate to prevent further damage and maintain accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a slippable clutch is interposed between the motor and the tailgate to enable motion of the tailgate independent of the motor when external forces are large, then motor damage from backdriving is prevented, but synchronization and association between motor rotation and tailgate motion is disrupted causing incorrect tailgate positioning
Solution Approach 1:
The control module monitors clutch slip conditions by comparing expected motor armature rotations with actual rotations detected by the Hall effect sensor. When excessive slip is detected (difference exceeds threshold), the system generates an alert and requires manual reset, providing feedback to maintain positioning accuracy while allowing clutch slip protection
Solution Approach 2:
The clutch acts as an intermediary element between the motor and tailgate, allowing controlled slippage to protect the motor from damage while the control system mediates the synchronization issue by detecting slip conditions and managing motor operation accordingly
2Adaptability or versatility
If the clutch slips to allow independent tailgate motion during large external forces, then the tailgate can move independently of the motor, but the association between motor rotation count and tailgate position is lost
Solution Approach 1:
The system continuously monitors the relationship between motor rotations and tailgate position through the Hall effect sensor and control module. When clutch slip causes desynchronization, the feedback mechanism detects the discrepancy and triggers an alert, restoring the information association by requiring system reset
Solution Approach 2:
The clutch is designed to slip partially under excessive external forces, allowing just enough independent motion to prevent motor damage while the control system detects and manages the slip condition to minimize loss of positioning information
Data Source
AI summary
A method for controlling a power tailgate in a vehicle power tailgate system includes steps of controlling operation of a motor to attempt to lower or raise a tailgate operably connected to the motor, determining that a clutch interposed between the motor and the tailgate (and operably connected to the motor and the tailgate) slipped by at least a predetermined slip amount during operation of the motor to attempt to lower or raise the tailgate and, responsive to the determination that the clutch slipped by at least the predetermined slip amount, generating an alert indicating a need for manual reset of the tailgate.