Vehicle Hatch Control Device Dynamic Threshold Adjustment
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Solution Overview
Problem
Existing control devices for automatically closing vehicle hatches often incorrectly terminate the closing procedure due to transient changes in current or rotary speed caused by vehicle dynamics, leading to false alarms and customer inconvenience.
Innovation Solution
A control device that considers vehicle speed as an input signal, ignoring fluctuations in rotary speed or current for a certain time window or distance when the vehicle is moving above a predetermined threshold, and only reacting to larger fluctuations during these conditions to prevent erroneous termination of the closing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control device reacts to all current and rotary speed fluctuations, then jamming events are detected reliably, but the closing procedure is unnecessarily interrupted during vehicle movement
Solution Approach 1:
The control device changes the detection parameters (sensitivity thresholds) based on the vehicle speed parameter. When the vehicle is stationary or moving slowly, the system uses low thresholds to detect even minor jamming events. When the vehicle speed exceeds the threshold, the system automatically increases the tolerance level, ignoring smaller fluctuations in current and rotary speed that are normal during vehicle movement. This parameter adaptation ensures reliable jamming detection without unnecessary interruptions to the closing procedure.
2Object-affected harmful factors
If the control device uses low trigger thresholds for sensitive response, then injury risk is reduced, but false-alarm blocking occurs during vehicle acceleration or on uneven ground
Solution Approach 1:
The control device implements dynamic threshold adjustment based on vehicle speed conditions. During vehicle acceleration or movement on uneven ground, the system detects elevated vehicle speed and automatically adapts by raising the effective trigger threshold, preventing false-alarm blocking. When the vehicle is stationary, the system maintains low trigger thresholds to ensure sensitive detection of potential jamming events that could cause injury. This dynamic approach resolves the contradiction between injury prevention and false-alarm reduction.
Data Source
AI summary
The control device relates to a vehicle having an automatically closing hatch, including at least one operating switch for outputting a closing command to automatically close the hatch by way of at least one actuator, a monitoring device for recognizing a blocking or jamming event during the closing procedure and a programmable electronic control unit which is connected with both the operating switch and the monitoring device, and which detects the vehicle speed as an input signal. The monitoring device is designed such that a risk of jamming can be recognized by monitoring the current curve and/or the rotational speed curve of the actuator. The control unit is programmed so as to only stop the closing procedure on recognition of a risk of jamming if the vehicle speed is less than a specified threshold value. Additionally or alternatively, the control unit is programmed so as to initially only react to the occurrence of comparatively large speed or current fluctuations by terminating the automatic closing procedure, for a certain time window and/or for a given distance covered by the tailgate, if the vehicle speed is above a specified threshold.