Capacitive Door Handle with Extracted Electronics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing door handles for heavy duty vehicles face challenges such as reduced strength due to multi-piece construction, complex wiring for power supply, and limited integration of electronic components, which hinder the implementation of keyless entry systems and power locking mechanisms.
Innovation Solution
A one-piece, self-contained door handle with a capacitive sensing element integrated into the base, featuring a power lock motor and printed circuit board for passive keyless entry, enhanced strength, and minimal power consumption, along with a capacitive sensor to authenticate user presence and a stand-alone design for simplified manufacturing and weather protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If keyless entry components are placed in the hand grip, then integrated door handle with keyless entry is achieved, but the grip must be made of two or more pieces reducing strength and requiring internal electronic components to be sealed from weather
Solution Approach 1:
The electronic components (capacitive sensor, control module, antenna) are extracted from the hand grip and relocated to the door panel or door frame. This allows the hand grip to remain as a single-piece mechanical component while the electronic system is housed separately, eliminating the need for multi-piece construction and internal sealing requirements.
2Adaptability or versatility
If keyless entry components are placed in the hand grip, then integrated door handle is achieved, but wires must be run through the pivotal pull handle providing limited options for power supply location
Solution Approach 1:
The electronic components are extracted from the hand grip and mounted externally on the door panel or door frame. This eliminates the need to route wires through the pivotal pull handle mechanism, simplifying the wiring architecture and providing flexible power supply location options independent of the handle's mechanical pivot point.
3Shape
If door handle assembly includes recessed pan or well for aerodynamics, then aerodynamic performance is improved, but positioning of door handle components such as power lock motor and wiring is complicated
Solution Approach 1:
The electronic components and power lock motor are extracted from the recessed pan or well area and mounted on the door panel or door frame surrounding the handle assembly. This allows the handle grip to be positioned flush with the door panel for aerodynamic purposes, while the mechanical and electronic components are located in the door panel or frame structure, simplifying their positioning and installation.
4Ease of manufacture
If capacitive sensor is placed in the door panel or door frame, then manufacturing simplicity is improved, but integrated door handle with keyless entry device is not achieved
Solution Approach 1:
The capacitive sensor, control module, and antenna are integrated into a single control unit that is mounted on the door panel or door frame. This control unit is then functionally combined with the door handle assembly through electrical connections, achieving both manufacturing simplicity (separate fabrication of handle and electronic unit) and system integration (combined functionality of handle and keyless entry).
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a robust, aerodynamically flexible, and energy-efficient power locking door handle with integrated electronics, enhancing user convenience and manufacturing simplicity while maintaining structural integrity and minimizing power usage.
Implementation Method 1
Pressure-sensitive capacitive detection devices are also used in the automotive industry for unlocking the vehicle door. Such touch sensors or button systems employ a capacitive sensor in the pull handle grip to open the door in response to physical pressure on mechanical contact switches.
Implementation Method 2
These systems rely on a change in the dielectric environment of an electrode in the door handle grip.
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
A power locking door handle with capacitive sensing is provided for heavy duty vehicles. The door handle includes a base surface mounted to the exterior of the vehicle door and a hand grip mounted or formed with the base. The handle may be a pull type or push button type. A power lock motor and printed circuit board with a capacitive sensor are sealed within the base. When an operator's hand is inserted between the hand grip and the base, the capacitive sensor sends a signal via the PCB to the motor to unlock the door latch. A key lock cylinder on the base overrides the lock motor if power to the motor is disabled.