Shift-by-Wire Control Bypassing Faulty Seat Belt Switch
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Solution Overview
Problem
Existing shift-by-wire systems for automatic transmissions may fail to properly switch to the parking range due to malfunctions in seat belt detection switches, leading to potential safety issues and erroneous operations.
Innovation Solution
A shift-by-wire control apparatus that includes a first detector (e.g., seat belt switch), a second detector (e.g., door switch), and a malfunction determining unit, which allows auto parking control to proceed based on the second detector's results if the first detector is determined to be malfunctioning, ensuring proper switching to the parking range even if the seat belt switch fails to detect changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system uses a seat belt switch to detect driver's seat belt fastening status for auto parking control, then the safety and reliability of automatic parking range switching is improved, but the system becomes vulnerable to malfunction of the seat belt switch which can prevent proper parking range switching
Solution Approach 1:
The malfunction determining unit acts as an intermediary between the seat belt switch and the auto parking controller. It monitors the detection results from the seat belt switch and determines whether the switch is malfunctioning by checking for unexpected changes in detection status. When a malfunction is detected, it prevents the faulty signal from reaching the auto parking controller, thereby protecting the system from erroneous operations while maintaining the benefits of seat belt status monitoring.
Solution Approach 2:
The system implements feedback by continuously monitoring the detection results from the seat belt switch and comparing them against expected behavior patterns. The malfunction determining unit receives feedback from the seat belt switch and adjusts system operation accordingly - when the feedback indicates normal operation, auto parking control proceeds; when feedback indicates malfunction, the system adapts by bypassing the faulty detector. This feedback mechanism enables the system to maintain reliability despite potential component failures.
2Measurement precision
If the system requires multiple detection conditions to be met for auto parking control, then the precision and accuracy of parking range switching is improved, but the system complexity increases
Solution Approach 1:
The detection system is segmented into independent functional units: the seat belt switch (first detector), the door switch (second detector), and the malfunction determining unit. Each unit performs a specific detection function independently. The malfunction determining unit separately evaluates the reliability of each detector and can selectively use检测结果 from either the first or second detector based on their operational status. This segmentation allows the system to maintain high detection precision through multiple conditions while managing complexity by organizing functions into modular, independent segments.
Solution Approach 2:
The system dynamically changes operational parameters based on detector status. When the seat belt switch is determined to be malfunctioning, the system changes the active detection parameter from seat belt status to door status. The malfunction determining unit adjusts which detector's results are used for auto parking control decisions, effectively changing the system's detection parameter from a fixed single-detector approach to a dynamic multi-detector approach that adapts to component reliability in real-time.
Data Source
AI summary
A shift-by-wire control apparatus includes: a first detector that detects a first vehicle state; a second detector that detects a second vehicle state; an auto parking controller that executes an auto parking control irrespective of a state of a shift range, on conditions that detection results derived from the first and second detectors satisfy respective predetermined conditions; and a malfunction determining unit that determines that the first detector is malfunctioning, on a condition that the first detector fails to detect a change in the first vehicle state. The auto parking controller executes, based on the detection result derived from the second detector, the auto parking control irrespective of the detection result derived from the first detector, on a condition that the first detector is determined by the malfunction determining unit as malfunctioning.