Vehicle Back Door Controller Deceleration Control
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Solution Overview
Problem
Conventional door opening and closing devices often cause back doors to rattle when suddenly stopped, leading to unstable motion and user discomfort due to inadequate deceleration control.
Innovation Solution
A door opening and closing device equipped with a motor and controller that automatically adjusts the target velocity of the back door using a predetermined deceleration to smoothly stop the door, preventing rattling by gradually reducing the velocity when a stop command is detected during automatic opening or closing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the door is suddenly stopped in the middle of movement, then the stop operation is quick and responsive, but the door rattles and motion appears unstable
Solution Approach 1:
The controller dynamically changes the deceleration parameter based on the door's current velocity and position. When a stop command is received during automatic opening/closing, the controller calculates an appropriate deceleration value that ensures the door comes to a smooth stop without rattling, rather than using a fixed or maximum deceleration value.
Solution Approach 2:
The stop operation is made dynamic by continuously adjusting the deceleration profile based on real-time door state. The controller monitors door velocity and position, and adapts the deceleration magnitude accordingly, transitioning from constant velocity mode to deceleration mode smoothly to maintain motion stability throughout the stopping process.
2Stability of the object's composition
If the target velocity is decreased at a predetermined deceleration, then the door stops smoothly without rattling, but the stop operation takes longer time
Solution Approach 1:
The controller applies partial deceleration action by using a predetermined deceleration value that is sufficient to prevent rattling but not excessive enough to cause unnecessarily long stopping time. The deceleration is applied only when needed (upon stop command during automatic operation) rather than continuously, optimizing the balance between smooth stopping and response time.
3Extent of automation
If automatic opening and closing control is executed, then the door operation is automated and convenient, but sudden stop commands cause rattling and user discomfort
Solution Approach 1:
The controller continuously monitors the door's movement state during automatic opening/closing operation and uses this feedback to determine the appropriate response to stop commands. By detecting the current velocity and position, the controller can adjust the deceleration profile to prevent rattling while maintaining the automated operation's convenience.
Data Source
AI summary
A door opening and closing device includes a motor that outputs driving force causing a back door of a vehicle to be opened or closed, and a controller that controls the motor. The controller executes automatic opening and closing control for automatically opening or closing the back door by the motor, and if the controller detects a stop command causing the back door to be stopped when the automatic opening and closing control is being executed, the controller decreases a target velocity of the back door at a predetermined deceleration α1 until the back door stops.