Motor Vehicle Lock Rotary Bolt Switch Positioning
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Solution Overview
Problem
Existing motor vehicle locks face challenges in reliably detecting locking states, particularly due to the complexity of monitoring error states like mock closure, which requires multiple signal outputs and is costly to implement effectively.
Innovation Solution
Assigning three switch positions to the rotary bolt switch and two positions to the pawl switch, allowing for the detection of six locking states, including error and intermediate states, using two binary signal outputs to maximize security and reduce evaluation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple switches and signal outputs are used to detect locking states, then the reliability of detecting closed states is improved, but the device complexity and cost increase
Solution Approach 1:
The rotary bolt switch is divided into three distinct switch positions (first, second, and third positions) corresponding to different rotational positions of the rotary bolt. This segmentation allows the single switch to provide multiple discrete signals that, when combined with the pawl switch signals, enable reliable detection of all locking states including mock closure without requiring multiple separate switches.
Solution Approach 2:
The rotary bolt switch serves multiple functions: it detects the open position, pre-locked position, and main locked position of the rotary bolt through its three switch positions. This multi-functionality allows a single switch component to replace what would traditionally require multiple switches, reducing device complexity while maintaining comprehensive state detection capability.
2Measurement precision
If three signal outputs are monitored to detect mock closure, then the detection accuracy is improved, but the control technology complexity increases
Solution Approach 1:
The rotary bolt switch is configured with three switch positions along the rotational path of the rotary bolt, adding a dimensional aspect to the detection system. This third dimension (three positions instead of two) allows the system to distinguish between different rotational positions of the rotary bolt, enabling accurate detection of mock closure and other intermediate states while maintaining manageable control complexity through a systematic signal evaluation approach.
3Reliability
If more switching positions are assigned to the rotary bolt switch, then the ability to detect intermediate and error states is improved, but the device complexity increases
Solution Approach 1:
The rotary bolt switch is designed to dynamically transition between three switch positions as the rotary bolt rotates during the locking process. This dynamic configuration allows the switch to automatically provide appropriate signals for different states (open, pre-locked, main locked) without requiring complex mechanical structures or additional components, achieving enhanced state detection with minimal increase in device complexity.
Data Source
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Figure 3a~3d
AI summary
The invention relates to a motor vehicle lock with a locking mechanism comprising a rotary bolt (1) and a pawl (2), wherein the rotary bolt (1) can be moved into an open position, a pre-latch position, and a main latch position, wherein the pawl (2) can be moved into a retracted position, in which it holds the rotary bolt (1) in the main latch position and in the pre-latch position, and into a lifted position, in which it releases the rotary bolt (1), wherein a circuit arrangement for detecting locking states is provided, comprising a rotary bolt switch (6) for detecting the rotary bolt position and a pawl switch (7) for detecting the pawl position. It is proposed that the rotary bolt switch (6) can be moved into three switching positions depending on the rotary bolt position and that the pawl switch (7) can be moved into two switching positions depending on the pawl position.