Electric Door Control Thrust Compensation Pinch Detection
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Solution Overview
Problem
Existing control devices for electrically driven doors struggle to detect door pinch states with high sensitivity and manage net thrust effectively, leading to passenger discomfort and safety concerns due to increased pressure during pinch events and variability in door operation caused by manufacturing inaccuracies.
Innovation Solution
A control device that includes a driving force instruction unit, a state observing unit to estimate mechanical resistant forces, a reference model to determine dynamic characteristics, and a gain compensator to compute thrust compensation values, which are added to the driving force instruction to manage net thrust and reduce impact during door pinch events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rigidity of the door tip rubber is increased to enhance detection sensitivity, then the door pinch state can be detected more easily, but the pressing pain experienced by the passenger increases
Solution Approach 1:
The patent changes the physical parameter of the door tip rubber from rigid to soft material. This soft rubber can be deformed by external force (such as a passenger's body) during door closing operation. The deformation amount is detected by a sensor to determine door pinch state, replacing the need for high rigidity materials.
Solution Approach 2:
The soft rubber acts as an intermediary between the door and the passenger. Instead of using a rigid structure that directly transmits high pressure to the passenger, the soft rubber deforms to absorb part of the force while still enabling detection through its deformation characteristics.
2Object-affected harmful factors
If the door thrust is limited to prevent excessive pressure during pinch events, then passenger safety is improved, but the ability to manage net thrust effectively is reduced due to variability in mechanical resistant force
Solution Approach 1:
The control device continuously monitors the actual door opening/closing speed and compares it with the instructed speed. Based on this feedback, it calculates the external force acting on the door and adjusts the driving force in real-time to maintain consistent net thrust despite variations in mechanical resistant force.
Solution Approach 2:
The patent implements dynamic adjustment of door thrust rather than a fixed limited value. The control device continuously modifies the driving force based on real-time detection of door speed and calculated external force, allowing the system to adapt to varying conditions while maintaining safety.
Data Source
AI summary
A control device for an electrically driven door is provided that can enhance the sensitivity of detection of a door pinch state and that can prevent a passenger from being pressed when the door pinch state occurs. The control device includes a driving force instruction value producing unit that outputs a driving force instruction value of the electrically driven door, a state observing unit that estimates a mechanical resistant force to a door driving system, a reference model that determines a dynamic characteristic of the electrically driven door to the mechanical resistant force estimated by the state observing unit, a gain compensator that computes a control compensation value that makes an output of the reference model coincide with an actual speed of the electrically driven door; and an adder that adds the control compensation value computed by the gain compensator to the driving force instruction value.