Steering Column Control Switches Eliminate Diodes
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Solution Overview
Problem
Existing control systems for motor vehicle steering columns are complex and require numerous electronic components, leading to increased size and complexity, particularly due to the need for diodes to prevent interference between switching levers for contradictory functions.
Innovation Solution
A simplified control system design that uses a microcontroller with movable contact means associated with series of switches, where only one switch can be closed at a time, eliminating the need for diodes and reducing the complexity of electrical connections by ensuring antinomic functions are mutually exclusive, thus simplifying the circuitry and potentially eliminating the need for a printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diodes are added to prevent interference between switching levers, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the diodes from the circuit by fundamentally changing the switching architecture. Instead of having multiple switches that could potentially interfere with each other, the invention uses a single movable contact that sequentially connects to different fixed contacts, eliminating the need for protective diodes entirely.
Solution Approach 2:
The patent inverts the traditional switching approach. Rather than having multiple independent switches that require diodes to prevent back-feeding, it uses a single movable contact that actively selects which switch to close, reversing the problem-solution relationship and eliminating the need for interference prevention components.
2Adaptability or versatility
If multiple switches are connected to the same output, then functionality is improved, but harmful interference is generated
Solution Approach 1:
The patent segments the switching functions by spatially separating the movable contact positions from the fixed contacts. Each fixed contact represents a distinct function, and the movable contact sequentially activates only one function at a time, allowing multiple functions to share a common output without interference.
Solution Approach 2:
The patent implements preliminary action by pre-positioning the movable contact in a neutral state where it is disconnected from all fixed contacts. This ensures that before any switching action occurs, the system is in a known safe state, and only one switch can be closed at any given time, preventing interference.
3Ease of manufacture
If a printed circuit board is used to connect components, then ease of manufacture is improved, but device complexity and size increase
Solution Approach 1:
The patent merges the switching contacts and electrical connections into a single integrated component structure. The movable contact and fixed contacts are directly positioned relative to each other without requiring a separate printed circuit board, combining multiple functions into one compact assembly.
Solution Approach 2:
The patent creates a universal switching component where the same basic structure (movable contact with multiple fixed contacts) can control multiple vehicle functions. This multi-functional design eliminates the need for separate circuit boards for different switching functions, reducing overall system complexity.
Data Source
Figure 1~3b
Figure 2
Figure 4~6
AI summary
The invention relates to a set of controls for the top of a motor vehicle steering column, in which set: - a mobile contact means (4a, 4b, 4c, 4d, 4e, 4f, 4g; 30; 41, 42) is associated with at least one series (I1, I2, I3, I4, I5, I6, I7; I'1) the first contact regions (P1) of which are respectively connected to distinct inputs (EA, EB, EC) of a microcontroller (2) and the second contact regions (P2) of which are connected to one and the same output (S1, S2, S3, S4, S5, S6, S7; S' I) of the microcontroller (2), - for each series (I1, I2, I3, I4, I5, I6, I7; I'1), the associated mobile contact means (4a, 4b, 4c, 4d, 4e, 4f, 4g; 30; 41, 42) is able to adopt several positions including at most one active contact position in which the mobile contact means connects two contact regions (P1, P2) with one another in such a way as to close just one switch of the series at any one time, and - processing means (3) of the microcontroller (2) are programmed to associate controls of antinomic functions of the vehicle with each position that the mobile contacting means of a series can adopt.