Handleless Car Door Locking with Intermediate Latch Position
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Solution Overview
Problem
Conventional car locking systems require a door handle for operation, which can lead to accidents when the door opens unexpectedly against obstacles due to lack of space, and there is no mechanism to ensure safe intermediate positioning without manual handling.
Innovation Solution
A locking device for car doors without door handles, featuring an electronic control unit connected to sensors and/or antennas for wireless communication with a smart device, and a driven mechanical lock/unlock unit that moves the door to a safe intermediate position upon correct access authorization, allowing authorized users to manually open the door from this position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a door handle is used for conventional car locking systems, then the door can be easily opened by manual handling, but the door may open unexpectedly against obstacles due to lack of space
Solution Approach 1:
The door opening process is segmented into two distinct phases: first moving the door to an intermediate position, then to the fully open position. This segmentation allows the system to control door movement more precisely, preventing unexpected full openings that could cause accidents while still allowing authorized users to easily open the door through the two-stage process
Solution Approach 2:
The system performs preliminary authorization verification through sensors and wireless communication before allowing any door movement. The electronic control unit validates access credentials in advance, and only then permits the door to move to the intermediate position, preventing unauthorized or accidental door openings that could lead to harmful incidents
2Object-affected harmful factors
If no door handle is provided, then accidents against obstacles are prevented, but the door cannot be easily opened without manual handling mechanisms
Solution Approach 1:
The traditional mechanical door handle is replaced with an electronic control system that uses sensors, wireless communication antennas, and an electronic control unit to manage door opening. This substitution eliminates the need for physical contact points that could cause accidents, while the system provides ease of operation through contactless authorization methods such as NFC, radio frequency identification, or proximity sensing
Solution Approach 2:
An intermediate position is introduced as a mediator between the closed and fully open door positions. The door first moves to this intermediate position after successful authorization, where it can be held temporarily. This intermediate state allows the system to verify authorization completely before allowing full door opening, maintaining safety while enabling convenient operation for authorized users
3Reliability
If an intermediate position is introduced, then door safety is improved by preventing unexpected full opening, but the device complexity increases with additional control mechanisms
Solution Approach 1:
The electronic control unit performs multiple functions: it processes wireless communication signals, validates authorization credentials, controls the motor-driven door movement, and manages the latching mechanism for the intermediate position. By consolidating these functions into a single control unit, the system achieves reliable intermediate position control without proportionally increasing overall device complexity
Solution Approach 2:
The system automatically verifies authorization credentials and controls door movement without requiring manual intervention beyond the initial approach. The sensors and antennas automatically detect and validate the user's authorization device, and the control unit autonomously manages the door's movement to the intermediate or fully open position, reducing the need for complex manual control mechanisms
4Extent of automation
If electronic control and driving means are added, then automatic door movement is achieved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The electronic control unit and the motor-driven mechanism are integrated into a unified system where the control unit directly manages the motor that moves the door. This merging of control and actuation functions reduces the need for separate control circuits, wiring harnesses, and mechanical linkages, achieving automatic door movement while limiting the increase in overall system complexity
Data Source
AI summary
A locking device for car doors without door handles, including: an electronic control unit for authorization of access, the electronic control unit being connected to one or more sensors and/or to an antenna for wireless communication for communication with a smart device; and a driven mechanical lock/or unlock unit including a latching element for latching a closed end position of a car door, wherein the latching element is provided to block an intermediate position of the car door, into which the car door is movable dependent on a correct access authorization and wherein the intermediate position of the car door enables a grip behind an outside surface of the car door to unlock the intermediate position of the car door and to allow further movement of the car door into an open end position.