Multi-function Switch Actuator with Evaluation Unit
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Solution Overview
Problem
Existing multifunction switches for motor vehicles require a large number of pressure switches to implement multiple switching functions, leading to increased costs and complexity.
Innovation Solution
Assigning pressure switches to both pressurization and pivoting of the actuating element for signal generation, allowing for a reduced number of switches and cost-effective construction by coupling them with an evaluation unit to assign unambiguous switching signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If eight pressure switches are used to implement eight switching functions controlled by pivoting the actuating element, then the number of switching functions is increased, but the cost and device complexity increase considerably
Solution Approach 1:
The pressure switches are designed to serve multiple functions: they detect both pressing operations (vertical movement) and pivoting operations (angular movement about two perpendicular axes). This multi-functionality allows four pressure switches to replace eight switches, reducing device complexity while maintaining eight switching functions through the evaluation unit's interpretation of switch combinations
Solution Approach 2:
The patent combines the detection of pressing and pivoting operations into a single set of four pressure switches. The evaluation unit merges the signals from these switches to distinguish between different operations (pressing, pivoting about first axis, pivoting about second axis) and to identify specific pivoting positions, thereby reducing the total number of switches needed
2Adaptability or versatility
If eight pressure switches are used to implement eight switching functions, then all switching functions can be controlled, but the manufacturing cost increases
Solution Approach 1:
Each pressure switch is designed as a multi-functional component that responds to multiple types of actuation (pressing and pivoting in different directions). This universality reduces the total component count from eight to four pressure switches, directly lowering manufacturing costs while the evaluation unit maintains the capability to recognize eight distinct switching functions through signal combination analysis
3Device complexity
If four pressure switches are used with an evaluation unit to reduce cost, then the number of switching elements is reduced, but unambiguous signal assignment becomes more challenging
Solution Approach 1:
The evaluation unit implements a feedback-based signal interpretation system that analyzes the combination of signals from the four pressure switches to unambiguously identify the actuating operation and position. By evaluating the pattern of activated switches and correlating it with the known geometry of the actuating element, the system resolves any potential signal ambiguity and correctly identifies the intended switching function
Solution Approach 2:
The patent introduces an additional dimension of analysis in the evaluation unit by considering not just which switches are activated but also the spatial relationships and combinations of activations. This multi-dimensional signal processing approach allows the system to distinguish between pressing, pivoting about the first axis, and pivoting about the second axis, even though the same physical switches may be involved in multiple operations
Data Source
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AI summary
The switch has an actuating element (1) i.e. press or rotary button, that is supported in a twistable manner. Four press switches (21-24) are attached to the actuating element for electrical switching functions. The switches are arranged together in a crosswise manner and coupled with an evaluation unit and connecting contacts, where the evaluation unit is arranged outside the switch. Eight switching functions are assigned to the press switches in star shaped rotatable switching positions of the actuating element. Light source designed of LED, is arranged on a printed circuit board (4). The press or rotary button is coupled with a fork light barrier (15) designed as a ring made of ferromagnetic material.