Vehicle Closure Panel Anti-Pinch System Using Actuator Feedback
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Solution Overview
Problem
Current powered latch assemblies for vehicle doors face challenges with complicated component configurations, large assembly footprints, and inadequate anti-pinch protection, particularly due to the expense and limited packaging options of existing pinch sensors, which struggle to detect pinch events effectively across all potential locations during the cinching operation.
Innovation Solution
A system comprising an actuator, sensor, and controller that monitors the position of a closure panel and inhibits its movement when an improper change is detected, providing variable output forces to prevent pinch events while ensuring the force applied does not exceed a predetermined limit, thus enhancing anti-pinch protection and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current pinch sensor systems are used, then some pinch protection is provided, but they are expensive and hard to package in a vehicle closure panel system
Solution Approach 1:
The patent combines the pinch detection functionality with the existing latch actuator and control systems. The control unit monitors the actuator's operation and detects pinch events through the actuator's feedback signals, eliminating the need for separate pinch sensor systems and reducing assembly complexity
Solution Approach 2:
The latch actuator system performs self-diagnosis during operation by monitoring its own performance parameters. The control unit detects pinch events by analyzing the actuator's current consumption and movement characteristics, allowing the system to identify obstacles without external sensors
2Reliability
If pinch strips are employed on lift gates, then pinch detection is provided at the outside edge, but they cannot be positioned in all locations where pinch events can occur and may not be sensitive enough during cinch operation
Solution Approach 1:
The system implements continuous feedback monitoring of the actuator's operation during the entire closure panel movement. The control unit analyzes real-time data from the actuator to detect pinch events at any position, providing comprehensive coverage throughout the cinch operation and eliminating the need for multiple fixed sensor positions
Solution Approach 2:
The patent replaces mechanical pinch strips with an electronic control system that uses the actuator's operational feedback. This substitution allows pinch detection throughout the entire range of motion rather than only at the limited location where mechanical strips can be mounted
3Reliability
If power assisted door latch assemblies are used, then latching of lightweight doors with hard seals is improved, but complicated latch component configurations and large assembly footprints result
Solution Approach 1:
The control unit serves multiple functions: it controls the actuator's movement, monitors for pinch events, and manages the latching sequence. This multi-functionality reduces the need for separate control systems and simplifies the overall latch assembly configuration
Solution Approach 2:
The system dynamically adjusts the actuator's force output during operation based on real-time feedback. The control unit modulates the actuator's power delivery to provide sufficient force for latching while preventing excessive force that could cause pinch events, optimizing performance without additional components
Data Source
AI summary
A system for detecting an obstacle between a closure panel and a body of a vehicle, comprising: an actuator for moving the closure panel from a partially closed position to a closed position; a sensor for sensing a position of the closure panel between the partially closed and the closed position; and a controller for receiving position signals from the sensor and for controlling operation of the actuator; wherein the controller is adapted to inhibit moving of the closure panel when the sensor detects an improper change in the position of the closure panel during operation of the actuator.